package server

import (
	"context"
	"encoding/json"
	"errors"
	"log/slog"
	"net/http"
	"strconv"
	"strings"
	"time"

	"github.com/danielgtaylor/huma/v2"

	"glchat/internal/bootstrap"
	"glchat/internal/permissions"
	"glchat/internal/store"
)

type channelPayload struct {
	ID              string `json:"id"`
	GuildID         string `json:"guild_id,omitempty"`
	Type            string `json:"type"`
	Name            string `json:"name"`
	Description     string `json:"description"`
	Position        int    `json:"position"`
	ParentID        string `json:"parent_id,omitempty"`
	SlowmodeSeconds int    `json:"slowmode_seconds"`
	UserLimit       int    `json:"user_limit"`
	CanView         bool   `json:"can_view"`
	CanSend         bool   `json:"can_send"`
	CanConnect      bool   `json:"can_connect"`
}

type rolePayload struct {
	ID          string `json:"id"`
	Name        string `json:"name"`
	Color       int64  `json:"color"`
	Position    int    `json:"position"`
	Permissions string `json:"permissions"`
	IsDefault   bool   `json:"is_default"`
	Hoist       bool   `json:"hoist"`
	Mentionable bool   `json:"mentionable"`
}

type memberPayload struct {
	UserID          string   `json:"user_id"`
	Username        string   `json:"username"`
	DisplayName     string   `json:"display_name"`
	Nickname        string   `json:"nickname,omitempty"`
	AvatarFileID    string   `json:"avatar_file_id,omitempty"`
	Status          string   `json:"status"`
	CustomStatus    string   `json:"custom_status"`
	IsInstanceAdmin bool     `json:"is_instance_admin"`
	JoinedAt        string   `json:"joined_at"`
	TimeoutUntil    string   `json:"timeout_until,omitempty"`
	RoleIDs         []string `json:"role_ids"`
}

type guildDetailPayload struct {
	ID            string           `json:"id"`
	Name          string           `json:"name"`
	Description   string           `json:"description"`
	OwnerID       string           `json:"owner_id"`
	IconFileID    string           `json:"icon_file_id,omitempty"`
	IsMain        bool             `json:"is_main"`
	MemberCount   int              `json:"member_count"`
	Roles         []rolePayload    `json:"roles"`
	MyRoleIDs     []string         `json:"my_role_ids"`
	MyPermissions []string         `json:"my_permissions"`
	Channels      []channelPayload `json:"channels,omitempty"`
}

func channelFromStore(channel store.Channel, resolved *permissions.Resolved) channelPayload {
	payload := channelPayload{
		ID:              formatSnowflake(channel.ID),
		Type:            string(channel.Type),
		Name:            channel.Name,
		Description:     channel.Description,
		Position:        channel.Position,
		SlowmodeSeconds: channel.SlowmodeSeconds,
		UserLimit:       channel.UserLimit,
	}
	if channel.GuildID != nil {
		payload.GuildID = formatSnowflake(*channel.GuildID)
	}
	if channel.ParentID != nil {
		payload.ParentID = formatSnowflake(*channel.ParentID)
	}
	if resolved != nil {
		payload.CanView = resolved.CanViewChannel()
		payload.CanSend = resolved.Can(permissions.SendMessages)
		payload.CanConnect = resolved.Can(permissions.ConnectVoice)
	}
	return payload
}

func roleFromStore(role store.Role) rolePayload {
	return rolePayload{
		ID:          formatSnowflake(role.ID),
		Name:        role.Name,
		Color:       role.Color,
		Position:    role.Position,
		Permissions: permissions.Permission(role.Permissions).String(),
		IsDefault:   role.IsDefault,
		Hoist:       role.Hoist,
		Mentionable: role.Mentionable,
	}
}

type guildOutput struct {
	Body struct {
		Guild guildDetailPayload `json:"guild"`
	}
}

type channelOutput struct {
	Body struct {
		Channel channelPayload `json:"channel"`
	}
}

type channelListOutput struct {
	Body struct {
		Channels []channelPayload `json:"channels"`
	}
}

type memberListOutput struct {
	Body struct {
		Members []memberPayload `json:"members"`
	}
}

type roleOutput struct {
	Body struct {
		Role rolePayload `json:"role"`
	}
}

type roleListOutput struct {
	Body struct {
		Roles []rolePayload `json:"roles"`
	}
}

// registerGuildRoutes описывает ручки серверов, комнат, участников и ролей.
func (s *Server) registerGuildRoutes(api huma.API) {
	s.registerGuildCoreRoutes(api)
	s.registerChannelRoutes(api)
	s.registerMemberRoutes(api)
	s.registerRoleRoutes(api)
}

func (s *Server) registerGuildCoreRoutes(api huma.API) {
	security := []map[string][]string{{"sessionCookie": {}}, {"bearerAuth": {}}}

	huma.Register(api, huma.Operation{
		OperationID: "createGuild",
		Method:      http.MethodPost,
		Path:        "/guilds",
		Summary:     "Создать сервер",
		Tags:        []string{"Guilds"},
		Security:    security,
	}, func(ctx context.Context, input *struct {
		Body struct {
			Name string `json:"name" minLength:"1" maxLength:"64"`
		}
	},
	) (*guildOutput, error) {
		user, _, err := requireUser(ctx)
		if err != nil {
			return nil, err
		}
		name := strings.TrimSpace(input.Body.Name)
		if name == "" {
			return nil, humaErrorStatus(http.StatusUnprocessableEntity, "validation.failed", "guild name must not be empty")
		}
		guild, err := s.createGuild(ctx, user, name)
		if err != nil {
			return nil, err
		}
		return s.guildOutput(ctx, user, *guild)
	})

	huma.Register(api, huma.Operation{
		OperationID: "getGuild",
		Method:      http.MethodGet,
		Path:        "/guilds/{guild_id}",
		Summary:     "Сервер: роли и права",
		Tags:        []string{"Guilds"},
		Security:    security,
	}, func(ctx context.Context, input *struct {
		GuildID string `path:"guild_id"`
	},
	) (*guildOutput, error) {
		user, _, err := requireUser(ctx)
		if err != nil {
			return nil, err
		}
		guildID, _, err := s.requireGuildPermission(ctx, input.GuildID, user, permissions.ViewGuild)
		if err != nil {
			return nil, err
		}
		guild, err := s.store.GetGuild(ctx, guildID)
		if err != nil {
			return nil, humaError(err)
		}
		return s.guildOutput(ctx, user, *guild)
	})

	huma.Register(api, huma.Operation{
		OperationID: "updateGuild",
		Method:      http.MethodPatch,
		Path:        "/guilds/{guild_id}",
		Summary:     "Изменить сервер",
		Tags:        []string{"Guilds"},
		Security:    security,
	}, func(ctx context.Context, input *struct {
		GuildID string `path:"guild_id"`
		Body    struct {
			Name        *string `json:"name,omitempty" maxLength:"64"`
			Description *string `json:"description,omitempty" maxLength:"500"`
			// Публичность сервера: попадает в каталог и открывает вход без
			// приглашения (AGENT.md 7.20).
			Public *bool `json:"public,omitempty"`
		}
	},
	) (*guildOutput, error) {
		user, _, err := requireUser(ctx)
		if err != nil {
			return nil, err
		}
		guildID, _, err := s.requireGuildPermission(ctx, input.GuildID, user, permissions.ManageGuild)
		if err != nil {
			return nil, err
		}
		params := store.UpdateGuildParams{Description: input.Body.Description}
		if input.Body.Public != nil {
			// Главный сервер публичным не делаем: он и так точка входа.
			if *input.Body.Public {
				guild, err := s.store.GetGuild(ctx, guildID)
				if err != nil {
					return nil, humaError(err)
				}
				if guild.IsMain {
					return nil, humaErrorStatus(http.StatusUnprocessableEntity, "validation.failed", "main guild is always open and cannot be published")
				}
			}
			params.IsDiscoverable = input.Body.Public
		}
		if input.Body.Name != nil {
			trimmed := strings.TrimSpace(*input.Body.Name)
			if trimmed == "" {
				return nil, humaErrorStatus(http.StatusUnprocessableEntity, "validation.failed", "guild name must not be empty")
			}
			params.Name = &trimmed
		}
		guild, err := s.store.UpdateGuild(ctx, guildID, params)
		if err != nil {
			return nil, humaError(err)
		}
		s.invalidateGuild(guildID)
		if s.gateway != nil {
			s.gateway.Dispatch("GUILD_UPDATE", map[string]any{
				"guild_id": formatSnowflake(guildID),
				"name":     guild.Name,
			})
		}
		return s.guildOutput(ctx, user, *guild)
	})

	huma.Register(api, huma.Operation{
		OperationID: "deleteGuild",
		Method:      http.MethodDelete,
		Path:        "/guilds/{guild_id}",
		Summary:     "Удалить сервер (владелец или админ инстанса)",
		Tags:        []string{"Guilds"},
		Security:    security,
	}, func(ctx context.Context, input *struct {
		GuildID string `path:"guild_id"`
	},
	) (*okOutput, error) {
		user, _, err := requireUser(ctx)
		if err != nil {
			return nil, err
		}
		guildID, resolved, err := s.requireGuildPermission(ctx, input.GuildID, user, permissions.ViewGuild)
		if err != nil {
			return nil, err
		}
		if !resolved.IsOwner && !user.IsInstanceAdmin {
			return nil, humaErrorStatus(http.StatusForbidden, "perm.denied", "only the owner can delete the guild")
		}
		if err := s.deleteGuild(ctx, user, guildID); err != nil {
			return nil, err
		}
		return newOKOutput(), nil
	})

	huma.Register(api, huma.Operation{
		OperationID: "joinGuild",
		Method:      http.MethodPost,
		Path:        "/guilds/{guild_id}/join",
		Summary:     "Присоединиться к открытому серверу",
		Tags:        []string{"Guilds"},
		Security:    security,
	}, func(ctx context.Context, input *struct {
		GuildID string `path:"guild_id"`
	},
	) (*okOutput, error) {
		user, _, err := requireUser(ctx)
		if err != nil {
			return nil, err
		}
		guildID, err := parseID("guild_id", input.GuildID)
		if err != nil {
			return nil, err
		}
		if err := s.joinGuild(ctx, user, guildID); err != nil {
			return nil, err
		}
		return newOKOutput(), nil
	})

	huma.Register(api, huma.Operation{
		OperationID: "leaveGuild",
		Method:      http.MethodPost,
		Path:        "/guilds/{guild_id}/leave",
		Summary:     "Покинуть сервер",
		Tags:        []string{"Guilds"},
		Security:    security,
	}, func(ctx context.Context, input *struct {
		GuildID string `path:"guild_id"`
	},
	) (*okOutput, error) {
		user, _, err := requireUser(ctx)
		if err != nil {
			return nil, err
		}
		guildID, resolved, err := s.requireGuildPermission(ctx, input.GuildID, user, permissions.ViewGuild)
		if err != nil {
			return nil, err
		}
		if resolved.IsOwner {
			return nil, humaErrorStatus(http.StatusForbidden, "guild.owner_cannot_leave", "owner cannot leave the guild")
		}
		if err := s.store.RemoveGuildMember(ctx, guildID, user.ID); err != nil {
			return nil, humaError(err)
		}
		s.invalidateGuild(guildID)
		if s.gateway != nil {
			s.gateway.SendToUser(user.ID, "GUILD_DELETE", map[string]any{"guild_id": formatSnowflake(guildID)})
		}
		return newOKOutput(), nil
	})

	huma.Register(api, huma.Operation{
		OperationID: "listAuditLog",
		Method:      http.MethodGet,
		Path:        "/guilds/{guild_id}/audit-log",
		Summary:     "Журнал действий сервера",
		Tags:        []string{"Guilds"},
		Security:    security,
	}, func(ctx context.Context, input *struct {
		GuildID  string `path:"guild_id"`
		Limit    int    `query:"limit" default:"50" minimum:"1" maximum:"200"`
		Action   string `query:"action" maxLength:"64"`
		ActorID  string `query:"actor_id"`
		TargetID string `query:"target_id"`
		BeforeID string `query:"before_id"`
	},
	) (*auditListOutput, error) {
		user, _, err := requireUser(ctx)
		if err != nil {
			return nil, err
		}
		guildID, _, err := s.requireGuildPermission(ctx, input.GuildID, user, permissions.ViewAuditLog)
		if err != nil {
			return nil, err
		}
		filter := store.AuditFilter{Limit: input.Limit, Action: strings.TrimSpace(input.Action)}
		for _, field := range []struct {
			raw   string
			apply func(uint64)
		}{
			{input.ActorID, func(value uint64) { filter.ActorID = value }},
			{input.TargetID, func(value uint64) { filter.TargetID = value }},
			{input.BeforeID, func(value uint64) { filter.BeforeID = value }},
		} {
			if strings.TrimSpace(field.raw) == "" {
				continue
			}
			parsed, err := parseID("filter", field.raw)
			if err != nil {
				return nil, err
			}
			field.apply(parsed)
		}
		entries, err := s.store.ListAuditLogFiltered(ctx, guildID, filter)
		if err != nil {
			return nil, humaError(err)
		}
		output := &auditListOutput{}
		output.Body.Entries = auditPayloads(entries)
		return output, nil
	})
}

func (s *Server) registerChannelRoutes(api huma.API) {
	security := []map[string][]string{{"sessionCookie": {}}, {"bearerAuth": {}}}

	huma.Register(api, huma.Operation{
		OperationID: "listGuildChannels",
		Method:      http.MethodGet,
		Path:        "/guilds/{guild_id}/channels",
		Summary:     "Комнаты сервера, видимые пользователю",
		Tags:        []string{"Channels"},
		Security:    security,
	}, func(ctx context.Context, input *struct {
		GuildID string `path:"guild_id"`
	},
	) (*channelListOutput, error) {
		user, _, err := requireUser(ctx)
		if err != nil {
			return nil, err
		}
		guildID, _, err := s.requireGuildPermission(ctx, input.GuildID, user, permissions.ViewGuild)
		if err != nil {
			return nil, err
		}
		channels, err := s.visibleChannels(ctx, guildID, user)
		if err != nil {
			return nil, err
		}
		output := &channelListOutput{}
		output.Body.Channels = channels
		return output, nil
	})

	huma.Register(api, huma.Operation{
		OperationID: "createChannel",
		Method:      http.MethodPost,
		Path:        "/guilds/{guild_id}/channels",
		Summary:     "Создать комнату",
		Tags:        []string{"Channels"},
		Security:    security,
	}, func(ctx context.Context, input *struct {
		GuildID string `path:"guild_id"`
		Body    struct {
			Name            string `json:"name" minLength:"1" maxLength:"64"`
			Type            string `json:"type,omitempty" enum:"text,voice,category"`
			ParentID        string `json:"parent_id,omitempty"`
			SlowmodeSeconds int    `json:"slowmode_seconds,omitempty" minimum:"0" maximum:"21600"`
			UserLimit       int    `json:"user_limit,omitempty" minimum:"0" maximum:"99"`
		}
	},
	) (*channelOutput, error) {
		user, _, err := requireUser(ctx)
		if err != nil {
			return nil, err
		}
		guildID, _, err := s.requireGuildPermission(ctx, input.GuildID, user, permissions.ManageChannels)
		if err != nil {
			return nil, err
		}
		channelType := store.ChannelType(input.Body.Type)
		if channelType == "" {
			channelType = store.ChannelText
		}
		switch channelType {
		// Личные комнаты (dm) создаются не через API сервера (AGENT.md 6.3).
		case store.ChannelText, store.ChannelVoice, store.ChannelCategory:
		case store.ChannelDM:
			return nil, humaErrorStatus(http.StatusUnprocessableEntity, "validation.failed", "dm channels are created by the messaging API")
		default:
			return nil, humaErrorStatus(http.StatusUnprocessableEntity, "validation.failed", "unknown channel type")
		}
		name := strings.TrimSpace(input.Body.Name)
		if name == "" {
			return nil, humaErrorStatus(http.StatusUnprocessableEntity, "validation.failed", "channel name must not be empty")
		}
		params := store.CreateChannelParams{
			GuildID:         &guildID,
			Type:            channelType,
			Name:            name,
			SlowmodeSeconds: input.Body.SlowmodeSeconds,
			UserLimit:       input.Body.UserLimit,
		}
		if input.Body.ParentID != "" {
			parentID, err := parseID("parent_id", input.Body.ParentID)
			if err != nil {
				return nil, err
			}
			params.ParentID = &parentID
		}
		channel, err := s.store.CreateChannel(ctx, params)
		if err != nil {
			return nil, humaError(err)
		}
		// Системная запись о создании комнаты (AGENT.md 7.6).
		s.postSystemMessage(ctx, channel.ID, "channel_created", map[string]any{
			"name": channel.Name,
			"type": string(channel.Type),
		})
		s.invalidateGuild(guildID)
		s.dispatchGuildEvent(guildID, "CHANNEL_CREATE", channelFromStore(*channel, nil))
		// Права на новую комнату считаем для автора запроса.
		resolved, err := s.perms.Channel(ctx, guildID, channel.ID, user.ID, user.IsInstanceAdmin)
		if err != nil {
			return nil, humaError(err)
		}
		output := &channelOutput{}
		output.Body.Channel = channelFromStore(*channel, &resolved)
		return output, nil
	})

	huma.Register(api, huma.Operation{
		OperationID: "updateChannel",
		Method:      http.MethodPatch,
		Path:        "/guilds/{guild_id}/channels/{channel_id}",
		Summary:     "Изменить комнату",
		Tags:        []string{"Channels"},
		Security:    security,
	}, func(ctx context.Context, input *struct {
		GuildID   string `path:"guild_id"`
		ChannelID string `path:"channel_id"`
		Body      struct {
			Name            *string `json:"name,omitempty" maxLength:"64"`
			Description     *string `json:"description,omitempty" maxLength:"500"`
			Position        *int    `json:"position,omitempty" minimum:"0" maximum:"1000"`
			SlowmodeSeconds *int    `json:"slowmode_seconds,omitempty" minimum:"0" maximum:"21600"`
			UserLimit       *int    `json:"user_limit,omitempty" minimum:"0" maximum:"99"`
		}
	},
	) (*channelOutput, error) {
		user, _, err := requireUser(ctx)
		if err != nil {
			return nil, err
		}
		guildID, _, err := s.requireGuildPermission(ctx, input.GuildID, user, permissions.ManageChannels)
		if err != nil {
			return nil, err
		}
		channelID, err := parseID("channel_id", input.ChannelID)
		if err != nil {
			return nil, err
		}
		if err := s.requireChannelInGuild(ctx, guildID, channelID); err != nil {
			return nil, err
		}
		params := store.UpdateChannelParams{
			Name:            input.Body.Name,
			Description:     input.Body.Description,
			Position:        input.Body.Position,
			SlowmodeSeconds: input.Body.SlowmodeSeconds,
			UserLimit:       input.Body.UserLimit,
		}
		channel, err := s.store.UpdateChannel(ctx, channelID, params)
		if err != nil {
			return nil, humaError(err)
		}
		s.invalidateGuild(guildID)
		s.dispatchGuildEvent(guildID, "CHANNEL_UPDATE", channelFromStore(*channel, nil))
		resolved, err := s.perms.Channel(ctx, guildID, channelID, user.ID, user.IsInstanceAdmin)
		if err != nil {
			return nil, humaError(err)
		}
		output := &channelOutput{}
		output.Body.Channel = channelFromStore(*channel, &resolved)
		return output, nil
	})

	huma.Register(api, huma.Operation{
		OperationID: "deleteChannel",
		Method:      http.MethodDelete,
		Path:        "/guilds/{guild_id}/channels/{channel_id}",
		Summary:     "Удалить комнату",
		Tags:        []string{"Channels"},
		Security:    security,
	}, func(ctx context.Context, input *struct {
		GuildID   string `path:"guild_id"`
		ChannelID string `path:"channel_id"`
	},
	) (*okOutput, error) {
		user, _, err := requireUser(ctx)
		if err != nil {
			return nil, err
		}
		guildID, _, err := s.requireGuildPermission(ctx, input.GuildID, user, permissions.ManageChannels)
		if err != nil {
			return nil, err
		}
		channelID, err := parseID("channel_id", input.ChannelID)
		if err != nil {
			return nil, err
		}
		if err := s.requireChannelInGuild(ctx, guildID, channelID); err != nil {
			return nil, err
		}
		if err := s.store.DeleteChannel(ctx, channelID); err != nil {
			return nil, humaError(err)
		}
		s.invalidateGuild(guildID)
		s.dispatchGuildEvent(guildID, "CHANNEL_DELETE", map[string]any{
			"channel_id": formatSnowflake(channelID),
			"guild_id":   formatSnowflake(guildID),
		})
		return newOKOutput(), nil
	})
}

// requireChannelInGuild проверяет, что комната принадлежит серверу (AGENT.md 9.7).
func (s *Server) requireChannelInGuild(ctx context.Context, guildID, channelID uint64) error {
	channel, err := s.store.GetChannel(ctx, channelID)
	if err != nil {
		return humaError(err)
	}
	if channel.GuildID == nil || *channel.GuildID != guildID {
		return humaErrorStatus(http.StatusNotFound, "not_found", "channel not found")
	}
	return nil
}

// visibleChannels возвращает комнаты сервера, которые пользователь видит.
func (s *Server) visibleChannels(ctx context.Context, guildID uint64, user *store.User) ([]channelPayload, error) {
	channels, err := s.store.ListGuildChannels(ctx, guildID)
	if err != nil {
		return nil, humaError(err)
	}
	visible := make([]channelPayload, 0, len(channels))
	for _, channel := range channels {
		resolved, err := s.perms.Channel(ctx, guildID, channel.ID, user.ID, user.IsInstanceAdmin)
		if err != nil {
			return nil, humaError(err)
		}
		if !resolved.CanViewChannel() {
			continue
		}
		visible = append(visible, channelFromStore(channel, &resolved))
	}
	return visible, nil
}

// guildOutput собирает подробную карточку сервера с ролями и комнатами.
func (s *Server) guildOutput(ctx context.Context, user *store.User, guild store.Guild) (*guildOutput, error) {
	resolved, err := s.guildPermissions(ctx, guild.ID, user)
	if err != nil {
		return nil, err
	}
	payload := guildDetailPayload{
		ID:            formatSnowflake(guild.ID),
		Name:          guild.Name,
		Description:   guild.Description,
		OwnerID:       formatSnowflake(guild.OwnerID),
		IsMain:        guild.IsMain,
		MyRoleIDs:     []string{},
		MyPermissions: permissions.Names(resolved.Guild),
		Roles:         []rolePayload{},
	}
	if guild.IconFileID != nil {
		payload.IconFileID = formatSnowflake(*guild.IconFileID)
	}
	roleIDs, err := s.store.MemberRoleIDs(ctx, guild.ID, user.ID)
	if err != nil {
		return nil, humaError(err)
	}
	for _, roleID := range roleIDs {
		payload.MyRoleIDs = append(payload.MyRoleIDs, formatSnowflake(roleID))
	}
	roles, err := s.store.ListGuildRoles(ctx, guild.ID)
	if err != nil {
		return nil, humaError(err)
	}
	for _, role := range roles {
		payload.Roles = append(payload.Roles, roleFromStore(role))
	}
	channels, err := s.visibleChannels(ctx, guild.ID, user)
	if err != nil {
		return nil, err
	}
	payload.Channels = channels
	count, err := s.store.CountGuildMembers(ctx, guild.ID)
	if err != nil {
		return nil, humaError(err)
	}
	payload.MemberCount = count
	output := &guildOutput{}
	output.Body.Guild = payload
	return output, nil
}

// dispatchGuildEvent рассылает событие всем подключённым клиентам. Клиент
// сам решает, относится ли событие к его серверу: в Фазе 1 подписки на
// серверы не отслеживаются, фильтрация появится вместе с чатом (AGENT.md 8.3).
func (s *Server) dispatchGuildEvent(_ uint64, event string, payload any) {
	if s.gateway == nil {
		return
	}
	s.gateway.Dispatch(event, payload)
}

func (s *Server) invalidateGuild(guildID uint64) {
	if s.perms != nil {
		s.perms.InvalidateGuild(guildID)
	}
}

func (s *Server) registerMemberRoutes(api huma.API) {
	security := []map[string][]string{{"sessionCookie": {}}, {"bearerAuth": {}}}

	huma.Register(api, huma.Operation{
		OperationID: "listGuildMembers",
		Method:      http.MethodGet,
		Path:        "/guilds/{guild_id}/members",
		Summary:     "Участники сервера",
		Tags:        []string{"Members"},
		Security:    security,
	}, func(ctx context.Context, input *struct {
		GuildID string `path:"guild_id"`
		Limit   int    `query:"limit" default:"100" minimum:"1" maximum:"1000"`
	},
	) (*memberListOutput, error) {
		user, _, err := requireUser(ctx)
		if err != nil {
			return nil, err
		}
		guildID, _, err := s.requireGuildPermission(ctx, input.GuildID, user, permissions.ViewGuild)
		if err != nil {
			return nil, err
		}
		profiles, err := s.store.ListGuildMemberProfiles(ctx, guildID)
		if err != nil {
			return nil, humaError(err)
		}
		output := &memberListOutput{}
		output.Body.Members = make([]memberPayload, 0, len(profiles))
		for _, profile := range profiles {
			if len(output.Body.Members) >= input.Limit {
				break
			}
			output.Body.Members = append(output.Body.Members, memberFromProfile(profile))
		}
		return output, nil
	})

	huma.Register(api, huma.Operation{
		OperationID: "updateGuildMember",
		Method:      http.MethodPatch,
		Path:        "/guilds/{guild_id}/members/{user_id}",
		Summary:     "Никнейм и тайм-аут участника",
		Tags:        []string{"Members"},
		Security:    security,
	}, func(ctx context.Context, input *struct {
		GuildID string `path:"guild_id"`
		UserID  string `path:"user_id"`
		Body    struct {
			Nickname     *string `json:"nickname,omitempty" maxLength:"32"`
			TimeoutUntil *string `json:"timeout_until,omitempty"`
		}
	},
	) (*okOutput, error) {
		user, _, err := requireUser(ctx)
		if err != nil {
			return nil, err
		}
		guildID, resolved, err := s.requireGuildPermission(ctx, input.GuildID, user, permissions.ViewGuild)
		if err != nil {
			return nil, err
		}
		targetID, err := parseID("user_id", input.UserID)
		if err != nil {
			return nil, err
		}
		// Свой никнейм участник меняет сам: иерархия и MANAGE_NICKNAMES для
		// этого не нужны (AGENT.md 7.2, 7.17). Тайм-аут на себя — запрещён.
		selfEdit := targetID == user.ID
		if !selfEdit {
			if err := s.checkMemberHierarchy(ctx, guildID, user, resolved, targetID); err != nil {
				return nil, err
			}
		}
		var (
			nickname     *string
			timeoutUntil *time.Time
		)
		if input.Body.Nickname != nil {
			if !selfEdit && !resolved.Has(permissions.ManageNicknames) {
				return nil, humaErrorStatus(http.StatusForbidden, "perm.denied", "MANAGE_NICKNAMES is required")
			}
			trimmed := strings.TrimSpace(*input.Body.Nickname)
			nickname = &trimmed
		}
		if input.Body.TimeoutUntil != nil {
			if selfEdit {
				return nil, humaErrorStatus(http.StatusForbidden, "perm.denied", "you cannot time yourself out")
			}
			if !resolved.Has(permissions.TimeoutMembers) {
				return nil, humaErrorStatus(http.StatusForbidden, "perm.denied", "TIMEOUT_MEMBERS is required")
			}
			parsed, err := time.Parse(time.RFC3339, *input.Body.TimeoutUntil)
			if err != nil {
				return nil, humaErrorStatus(http.StatusUnprocessableEntity, "validation.failed", "timeout_until must be RFC3339")
			}
			timeoutUntil = &parsed
		}
		if err := s.store.UpdateGuildMember(ctx, guildID, targetID, nickname, timeoutUntil); err != nil {
			return nil, humaError(err)
		}
		s.invalidateGuild(guildID)
		payload := map[string]any{
			"guild_id": formatSnowflake(guildID),
			"user_id":  formatSnowflake(targetID),
			"nickname": nickname,
		}
		// Тайм-аут показываем в событии: клиенты обновляют состояние без F5.
		if timeoutUntil != nil {
			if timeoutUntil.After(time.Now().UTC()) {
				payload["timeout_until"] = timeoutUntil.UTC().Format(time.RFC3339)
			} else {
				payload["timeout_until"] = nil
			}
		}
		s.dispatchGuildEvent(guildID, "MEMBER_UPDATE", payload)
		return newOKOutput(), nil
	})

	huma.Register(api, huma.Operation{
		OperationID: "kickGuildMember",
		Method:      http.MethodDelete,
		Path:        "/guilds/{guild_id}/members/{user_id}",
		Summary:     "Исключить участника",
		Tags:        []string{"Members"},
		Security:    security,
	}, func(ctx context.Context, input *struct {
		GuildID string `path:"guild_id"`
		UserID  string `path:"user_id"`
	},
	) (*okOutput, error) {
		user, _, err := requireUser(ctx)
		if err != nil {
			return nil, err
		}
		guildID, resolved, err := s.requireGuildPermission(ctx, input.GuildID, user, permissions.KickMembers)
		if err != nil {
			return nil, err
		}
		targetID, err := parseID("user_id", input.UserID)
		if err != nil {
			return nil, err
		}
		if err := s.checkMemberHierarchy(ctx, guildID, user, resolved, targetID); err != nil {
			return nil, err
		}
		if err := s.store.RemoveGuildMember(ctx, guildID, targetID); err != nil {
			return nil, humaError(err)
		}
		// Системная запись об исключении участника.
		s.postSystemMessage(ctx, s.systemChannelID(ctx, guildID), "member_kick", map[string]any{
			"user_id": formatSnowflake(targetID),
		})
		s.invalidateGuild(guildID)
		s.recordAudit(ctx, user, guildID, "member.kick", "user", &targetID, "")
		s.dispatchGuildEvent(guildID, "MEMBER_REMOVE", map[string]any{
			"guild_id": formatSnowflake(guildID),
			"user_id":  formatSnowflake(targetID),
		})
		if s.gateway != nil {
			s.gateway.SendToUser(targetID, "GUILD_DELETE", map[string]any{"guild_id": formatSnowflake(guildID)})
		}
		return newOKOutput(), nil
	})

	huma.Register(api, huma.Operation{
		OperationID: "addMemberRole",
		Method:      http.MethodPut,
		Path:        "/guilds/{guild_id}/members/{user_id}/roles/{role_id}",
		Summary:     "Выдать роль участнику",
		Tags:        []string{"Roles"},
		Security:    security,
	}, func(ctx context.Context, input *struct {
		GuildID string `path:"guild_id"`
		UserID  string `path:"user_id"`
		RoleID  string `path:"role_id"`
	},
	) (*okOutput, error) {
		return s.changeMemberRole(ctx, input.GuildID, input.UserID, input.RoleID, true)
	})

	huma.Register(api, huma.Operation{
		OperationID: "removeMemberRole",
		Method:      http.MethodDelete,
		Path:        "/guilds/{guild_id}/members/{user_id}/roles/{role_id}",
		Summary:     "Снять роль с участника",
		Tags:        []string{"Roles"},
		Security:    security,
	}, func(ctx context.Context, input *struct {
		GuildID string `path:"guild_id"`
		UserID  string `path:"user_id"`
		RoleID  string `path:"role_id"`
	},
	) (*okOutput, error) {
		return s.changeMemberRole(ctx, input.GuildID, input.UserID, input.RoleID, false)
	})
}

// changeMemberRole выдаёт или снимает роль с проверкой иерархии (AGENT.md 6.3).
func (s *Server) changeMemberRole(ctx context.Context, guildIDRaw, userIDRaw, roleIDRaw string, assign bool) (*okOutput, error) {
	user, _, err := requireUser(ctx)
	if err != nil {
		return nil, err
	}
	guildID, resolved, err := s.requireGuildPermission(ctx, guildIDRaw, user, permissions.ManageRoles)
	if err != nil {
		return nil, err
	}
	targetID, err := parseID("user_id", userIDRaw)
	if err != nil {
		return nil, err
	}
	roleID, err := parseID("role_id", roleIDRaw)
	if err != nil {
		return nil, err
	}
	if err := s.checkMemberHierarchy(ctx, guildID, user, resolved, targetID); err != nil {
		return nil, err
	}
	role, err := s.store.GetRole(ctx, roleID)
	if err != nil {
		return nil, humaError(err)
	}
	if role.GuildID != guildID {
		return nil, humaErrorStatus(http.StatusNotFound, "not_found", "role not found")
	}
	if !s.outranksRole(ctx, guildID, user, resolved, role) {
		return nil, humaErrorStatus(http.StatusForbidden, "perm.denied", "role is higher than yours")
	}
	if role.IsDefault {
		return nil, humaErrorStatus(http.StatusUnprocessableEntity, "validation.failed", "default role is assigned to everyone")
	}
	if assign {
		err = s.store.AssignRole(ctx, guildID, targetID, roleID)
	} else {
		err = s.store.RemoveRole(ctx, guildID, targetID, roleID)
	}
	if err != nil {
		return nil, humaError(err)
	}
	s.invalidateGuild(guildID)
	action := "member.role_add"
	if !assign {
		action = "member.role_remove"
	}
	s.recordAudit(ctx, user, guildID, action, "role", &roleID, "")
	// Смена ролей — это обновление участника (AGENT.md 8.3: MEMBER_UPDATE).
	roleIDs, err := s.store.MemberRoleIDs(ctx, guildID, targetID)
	if err != nil {
		return nil, humaError(err)
	}
	formatted := make([]string, 0, len(roleIDs))
	for _, id := range roleIDs {
		formatted = append(formatted, formatSnowflake(id))
	}
	s.dispatchGuildEvent(guildID, "MEMBER_UPDATE", map[string]any{
		"guild_id":   formatSnowflake(guildID),
		"user_id":    formatSnowflake(targetID),
		"role_ids":   formatted,
		"role_id":    formatSnowflake(roleID),
		"role_added": assign,
	})
	return newOKOutput(), nil
}

// checkMemberHierarchy запрещает действовать против владельца и участников с
// более высокими ролями (AGENT.md 6.3, 7.17).
func (s *Server) checkMemberHierarchy(ctx context.Context, guildID uint64, actor *store.User, resolved permissions.Resolved, targetID uint64) error {
	// Модерировать себя нельзя никому, включая администратора инстанса: иначе
	// он может случайно исключить или забанить сам себя (проверено на стенде).
	if targetID == actor.ID {
		return humaErrorStatus(http.StatusForbidden, "perm.denied", "you cannot moderate yourself")
	}
	if actor.IsInstanceAdmin {
		return nil
	}
	guild, err := s.store.GetGuild(ctx, guildID)
	if err != nil {
		return humaError(err)
	}
	// Администратора инстанса нельзя модерировать с сервера: его права
	// глобальны и не могут быть отозваны владельцем сервера (AGENT.md 7.19).
	if target, err := s.store.GetUser(ctx, targetID); err == nil && target.IsInstanceAdmin {
		return humaErrorStatus(http.StatusForbidden, "instance.admin_protected", "instance administrator cannot be moderated")
	}
	if targetID == guild.OwnerID && actor.ID != guild.OwnerID {
		return humaErrorStatus(http.StatusForbidden, "perm.denied", "guild owner cannot be moderated")
	}
	actorRoles, err := s.roleData(ctx, guildID, actor.ID)
	if err != nil {
		return err
	}
	targetRoles, err := s.roleData(ctx, guildID, targetID)
	if err != nil {
		return err
	}
	targetIsOwner := targetID == guild.OwnerID
	if !permissions.OutranksMember(actorRoles, targetRoles, resolved.IsOwner, targetIsOwner) {
		return humaErrorStatus(http.StatusForbidden, "perm.denied", "target member has an equal or higher role")
	}
	return nil
}

// outranksRole проверяет, что роль ниже роли действующего пользователя.
func (s *Server) outranksRole(ctx context.Context, guildID uint64, actor *store.User, resolved permissions.Resolved, role *store.Role) bool {
	if actor.IsInstanceAdmin || resolved.IsOwner {
		return true
	}
	actorRoles, err := s.roleData(ctx, guildID, actor.ID)
	if err != nil {
		return false
	}
	return permissions.OutranksRole(actorRoles, permissions.RoleData{
		ID:          role.ID,
		Permissions: permissions.Permission(role.Permissions),
		IsDefault:   role.IsDefault,
		Position:    role.Position,
	}, false)
}

// roleData переводит роли участника в данные движка прав.
func (s *Server) roleData(ctx context.Context, guildID, userID uint64) ([]permissions.RoleData, error) {
	roles, err := s.store.MemberRoles(ctx, guildID, userID)
	if err != nil {
		return nil, humaError(err)
	}
	result := make([]permissions.RoleData, 0, len(roles))
	for _, role := range roles {
		result = append(result, permissions.RoleData{
			ID:          role.ID,
			Permissions: permissions.Permission(role.Permissions),
			IsDefault:   role.IsDefault,
			Position:    role.Position,
		})
	}
	return result, nil
}

func (s *Server) registerRoleRoutes(api huma.API) {
	security := []map[string][]string{{"sessionCookie": {}}, {"bearerAuth": {}}}

	huma.Register(api, huma.Operation{
		OperationID: "listGuildRoles",
		Method:      http.MethodGet,
		Path:        "/guilds/{guild_id}/roles",
		Summary:     "Роли сервера",
		Tags:        []string{"Roles"},
		Security:    security,
	}, func(ctx context.Context, input *struct {
		GuildID string `path:"guild_id"`
	},
	) (*roleListOutput, error) {
		user, _, err := requireUser(ctx)
		if err != nil {
			return nil, err
		}
		guildID, _, err := s.requireGuildPermission(ctx, input.GuildID, user, permissions.ViewGuild)
		if err != nil {
			return nil, err
		}
		roles, err := s.store.ListGuildRoles(ctx, guildID)
		if err != nil {
			return nil, humaError(err)
		}
		output := &roleListOutput{}
		output.Body.Roles = make([]rolePayload, 0, len(roles))
		for _, role := range roles {
			output.Body.Roles = append(output.Body.Roles, roleFromStore(role))
		}
		return output, nil
	})

	huma.Register(api, huma.Operation{
		OperationID: "createGuildRole",
		Method:      http.MethodPost,
		Path:        "/guilds/{guild_id}/roles",
		Summary:     "Создать роль",
		Tags:        []string{"Roles"},
		Security:    security,
	}, func(ctx context.Context, input *struct {
		GuildID string `path:"guild_id"`
		Body    struct {
			Name        string `json:"name" minLength:"1" maxLength:"64"`
			Permissions string `json:"permissions,omitempty"`
			Color       int64  `json:"color,omitempty" minimum:"0" maximum:"16777215"`
			Hoist       bool   `json:"hoist,omitempty"`
			Mentionable bool   `json:"mentionable,omitempty"`
		}
	},
	) (*roleOutput, error) {
		user, _, err := requireUser(ctx)
		if err != nil {
			return nil, err
		}
		guildID, _, err := s.requireGuildPermission(ctx, input.GuildID, user, permissions.ManageRoles)
		if err != nil {
			return nil, err
		}
		permissionSet, err := permissions.Parse(input.Body.Permissions)
		if err != nil {
			return nil, humaErrorStatus(http.StatusUnprocessableEntity, "validation.failed", err.Error())
		}
		if !s.canGrantPermissions(ctx, guildID, user, permissionSet) {
			return nil, humaErrorStatus(http.StatusForbidden, "perm.denied", "you cannot grant permissions you do not have")
		}
		name := strings.TrimSpace(input.Body.Name)
		if name == "" {
			return nil, humaErrorStatus(http.StatusUnprocessableEntity, "validation.failed", "role name must not be empty")
		}
		role, err := s.store.CreateRole(ctx, store.CreateRoleParams{
			GuildID:     guildID,
			Name:        name,
			Permissions: uint64(permissionSet),
			Color:       input.Body.Color,
			Hoist:       input.Body.Hoist,
			Mentionable: input.Body.Mentionable,
		})
		if err != nil {
			return nil, humaError(err)
		}
		s.invalidateGuild(guildID)
		s.recordAudit(ctx, user, guildID, "role.create", "role", &role.ID, "")
		s.dispatchGuildEvent(guildID, "ROLE_CREATE", roleFromStore(*role))
		output := &roleOutput{}
		output.Body.Role = roleFromStore(*role)
		return output, nil
	})

	huma.Register(api, huma.Operation{
		OperationID: "updateGuildRole",
		Method:      http.MethodPatch,
		Path:        "/guilds/{guild_id}/roles/{role_id}",
		Summary:     "Изменить роль",
		Tags:        []string{"Roles"},
		Security:    security,
	}, func(ctx context.Context, input *struct {
		GuildID string `path:"guild_id"`
		RoleID  string `path:"role_id"`
		Body    struct {
			Name        *string `json:"name,omitempty" maxLength:"64"`
			Permissions *string `json:"permissions,omitempty"`
			Color       *int64  `json:"color,omitempty" minimum:"0" maximum:"16777215"`
			Position    *int    `json:"position,omitempty" minimum:"0" maximum:"1000"`
			Hoist       *bool   `json:"hoist,omitempty"`
			Mentionable *bool   `json:"mentionable,omitempty"`
		}
	},
	) (*roleOutput, error) {
		user, _, err := requireUser(ctx)
		if err != nil {
			return nil, err
		}
		guildID, resolved, err := s.requireGuildPermission(ctx, input.GuildID, user, permissions.ManageRoles)
		if err != nil {
			return nil, err
		}
		roleID, err := parseID("role_id", input.RoleID)
		if err != nil {
			return nil, err
		}
		role, err := s.store.GetRole(ctx, roleID)
		if err != nil {
			return nil, humaError(err)
		}
		if role.GuildID != guildID {
			return nil, humaErrorStatus(http.StatusNotFound, "not_found", "role not found")
		}
		if !s.outranksRole(ctx, guildID, user, resolved, role) {
			return nil, humaErrorStatus(http.StatusForbidden, "perm.denied", "role is higher than yours")
		}
		params := store.UpdateRoleParams{
			Name:        input.Body.Name,
			Color:       input.Body.Color,
			Position:    input.Body.Position,
			Hoist:       input.Body.Hoist,
			Mentionable: input.Body.Mentionable,
		}
		if input.Body.Permissions != nil {
			permissionSet, err := permissions.Parse(*input.Body.Permissions)
			if err != nil {
				return nil, humaErrorStatus(http.StatusUnprocessableEntity, "validation.failed", err.Error())
			}
			if !s.canGrantPermissions(ctx, guildID, user, permissionSet) {
				return nil, humaErrorStatus(http.StatusForbidden, "perm.denied", "you cannot grant permissions you do not have")
			}
			value := uint64(permissionSet)
			params.Permissions = &value
		}
		updated, err := s.store.UpdateRole(ctx, roleID, params)
		if err != nil {
			return nil, humaError(err)
		}
		s.invalidateGuild(guildID)
		s.recordAudit(ctx, user, guildID, "role.update", "role", &roleID, "")
		s.dispatchGuildEvent(guildID, "ROLE_UPDATE", roleFromStore(*updated))
		output := &roleOutput{}
		output.Body.Role = roleFromStore(*updated)
		return output, nil
	})

	huma.Register(api, huma.Operation{
		OperationID: "deleteGuildRole",
		Method:      http.MethodDelete,
		Path:        "/guilds/{guild_id}/roles/{role_id}",
		Summary:     "Удалить роль",
		Tags:        []string{"Roles"},
		Security:    security,
	}, func(ctx context.Context, input *struct {
		GuildID string `path:"guild_id"`
		RoleID  string `path:"role_id"`
	},
	) (*okOutput, error) {
		user, _, err := requireUser(ctx)
		if err != nil {
			return nil, err
		}
		guildID, resolved, err := s.requireGuildPermission(ctx, input.GuildID, user, permissions.ManageRoles)
		if err != nil {
			return nil, err
		}
		roleID, err := parseID("role_id", input.RoleID)
		if err != nil {
			return nil, err
		}
		role, err := s.store.GetRole(ctx, roleID)
		if err != nil {
			return nil, humaError(err)
		}
		if role.GuildID != guildID {
			return nil, humaErrorStatus(http.StatusNotFound, "not_found", "role not found")
		}
		if role.IsDefault {
			return nil, humaErrorStatus(http.StatusUnprocessableEntity, "validation.failed", "default role cannot be deleted")
		}
		if !s.outranksRole(ctx, guildID, user, resolved, role) {
			return nil, humaErrorStatus(http.StatusForbidden, "perm.denied", "role is higher than yours")
		}
		if err := s.store.DeleteRole(ctx, roleID); err != nil {
			return nil, humaError(err)
		}
		s.invalidateGuild(guildID)
		s.recordAudit(ctx, user, guildID, "role.delete", "role", &roleID, "")
		s.dispatchGuildEvent(guildID, "ROLE_DELETE", map[string]any{
			"guild_id": formatSnowflake(guildID),
			"role_id":  formatSnowflake(roleID),
		})
		return newOKOutput(), nil
	})
}

// canGrantPermissions запрещает выдавать права выше собственных (AGENT.md 6.3).
func (s *Server) canGrantPermissions(ctx context.Context, guildID uint64, user *store.User, requested permissions.Permission) bool {
	if user.IsInstanceAdmin {
		return true
	}
	resolved, err := s.guildPermissions(ctx, guildID, user)
	if err != nil {
		return false
	}
	if resolved.IsOwner || resolved.Guild.Has(permissions.Administrator) {
		return true
	}
	return resolved.Guild.Has(requested)
}

// memberFromProfile собирает участника для ответа API.
func memberFromProfile(profile store.GuildMemberProfile) memberPayload {
	payload := memberPayload{
		UserID:          formatSnowflake(profile.UserID),
		Username:        profile.Username,
		DisplayName:     profile.DisplayName,
		Nickname:        profile.Nickname,
		Status:          profile.Status,
		CustomStatus:    profile.CustomStatus,
		IsInstanceAdmin: profile.IsInstanceAdmin,
		JoinedAt:        profile.JoinedAt.UTC().Format(time.RFC3339),
		RoleIDs:         make([]string, 0, len(profile.RoleIDs)),
	}
	if profile.AvatarFileID != nil {
		payload.AvatarFileID = formatSnowflake(*profile.AvatarFileID)
	}
	// Истёкший тайм-аут не показываем: он уже не действует.
	if profile.TimeoutUntil != nil && profile.TimeoutUntil.After(time.Now().UTC()) {
		payload.TimeoutUntil = profile.TimeoutUntil.UTC().Format(time.RFC3339)
	}
	for _, roleID := range profile.RoleIDs {
		payload.RoleIDs = append(payload.RoleIDs, formatSnowflake(roleID))
	}
	return payload
}

type auditEntryPayload struct {
	ID                 string          `json:"id"`
	GuildID            string          `json:"guild_id,omitempty"`
	ActorID            string          `json:"actor_id,omitempty"`
	ActorInstanceAdmin bool            `json:"actor_instance_admin"`
	Action             string          `json:"action"`
	TargetType         string          `json:"target_type"`
	TargetID           string          `json:"target_id,omitempty"`
	Reason             string          `json:"reason,omitempty"`
	Changes            json.RawMessage `json:"changes,omitempty"`
	CreatedAt          string          `json:"created_at"`
}

type auditListOutput struct {
	Body struct {
		Entries []auditEntryPayload `json:"entries"`
	}
}

func auditPayloads(entries []store.AuditEntry) []auditEntryPayload {
	payloads := make([]auditEntryPayload, 0, len(entries))
	for _, entry := range entries {
		payload := auditEntryPayload{
			ID:                 formatSnowflake(entry.ID),
			Action:             entry.Action,
			TargetType:         entry.TargetType,
			Reason:             entry.Reason,
			Changes:            entry.Changes,
			CreatedAt:          entry.CreatedAt.UTC().Format(time.RFC3339),
			ActorInstanceAdmin: entry.ActorInstanceAdmin,
		}
		if entry.GuildID != nil {
			payload.GuildID = formatSnowflake(*entry.GuildID)
		}
		if entry.ActorID != nil {
			payload.ActorID = formatSnowflake(*entry.ActorID)
		}
		if entry.TargetID != nil {
			payload.TargetID = formatSnowflake(*entry.TargetID)
		}
		payloads = append(payloads, payload)
	}
	return payloads
}

// postSystemMessage создаёт системное сообщение в комнате: лента показывает
// такие записи отдельным стилем (AGENT.md 7.6).
func (s *Server) postSystemMessage(ctx context.Context, channelID uint64, kind string, payload map[string]any) {
	if channelID == 0 {
		return
	}
	data := map[string]any{"event": kind}
	for key, value := range payload {
		data[key] = value
	}
	encoded, err := json.Marshal(data)
	if err != nil {
		return
	}
	message, err := s.store.CreateMessage(ctx, store.CreateMessageParams{
		ChannelID: channelID,
		AuthorID:  0,
		Content:   string(encoded),
		Type:      store.MessageSystem,
	})
	if err != nil {
		s.logger.DebugContext(ctx, "failed to post system message", slog.Any("error", err))
		return
	}
	if s.gateway == nil {
		return
	}
	payloadMessage, err := s.messagePayload(ctx, message, 0)
	if err != nil {
		return
	}
	s.gateway.DispatchToChannel(ctx, channelID, "MESSAGE_CREATE", payloadMessage)
}

// systemChannelID выбирает комнату для системных записей: первая текстовая.
func (s *Server) systemChannelID(ctx context.Context, guildID uint64) uint64 {
	channels, err := s.store.ListGuildChannels(ctx, guildID)
	if err != nil {
		return 0
	}
	for _, channel := range channels {
		if channel.Type == store.ChannelText {
			return channel.ID
		}
	}
	return 0
}

// recordAudit пишет действие в журнал; ошибка записи не ломает операцию.
func (s *Server) recordAudit(ctx context.Context, actor *store.User, guildID uint64, action, targetType string, targetID *uint64, reason string) {
	var guild *uint64
	if guildID != 0 {
		guild = &guildID
	}
	params := store.AuditParams{
		GuildID:            guild,
		ActorID:            &actor.ID,
		ActorInstanceAdmin: actor.IsInstanceAdmin,
		Action:             action,
		TargetType:         targetType,
		TargetID:           targetID,
		Reason:             reason,
	}
	if err := s.store.RecordAudit(ctx, params); err != nil {
		s.logger.WarnContext(ctx, "failed to record audit entry",
			slog.String("action", action), slog.Any("error", err))
	}
}

// createGuild создаёт сервер с ролями по умолчанию и общей комнатой (AGENT.md 6.3).
func (s *Server) createGuild(ctx context.Context, owner *store.User, name string) (*store.Guild, error) {
	settings, err := s.store.InstanceSettings(ctx)
	if err != nil {
		return nil, humaError(err)
	}
	// Лимиты считаются по числу серверов; администратор инстанса обходит их
	// осознанно, и это фиксируется в аудите (AGENT.md 6.5).
	created, err := s.store.CountGuildMemberships(ctx, owner.ID)
	if err != nil {
		return nil, humaError(err)
	}
	bypassed := false
	if created >= settings.MaxGuildsPerUser {
		if !owner.IsInstanceAdmin {
			return nil, humaErrorStatus(http.StatusForbidden, "limits.guilds_reached", "guild limit for this account is reached")
		}
		bypassed = true
	} else if !settings.AllowGuildCreation && !owner.IsInstanceAdmin {
		return nil, humaErrorStatus(http.StatusForbidden, "limits.guild_creation_disabled", "guild creation is disabled")
	}

	guild, err := s.store.CreateGuild(ctx, store.CreateGuildParams{
		Name:    name,
		OwnerID: owner.ID,
		// Пользовательский сервер становится главным только если главного нет.
		IsMain:         settings.MainGuildID == 0,
		IsDiscoverable: false,
	})
	if err != nil {
		return nil, humaError(err)
	}
	if _, err := bootstrap.SeedGuildDefaults(ctx, s.store, guild, owner); err != nil {
		return nil, humaError(err)
	}
	if _, err := s.store.CreateChannel(ctx, store.CreateChannelParams{
		GuildID: &guild.ID, Type: store.ChannelText, Name: "общий", Position: 0,
	}); err != nil {
		return nil, humaError(err)
	}
	if guild.IsMain {
		if err := s.store.SetInstanceSetting(ctx, "main_guild_id", strconv.FormatUint(guild.ID, 10)); err != nil {
			return nil, humaError(err)
		}
	}
	s.recordAudit(ctx, owner, guild.ID, "guild.create", "guild", &guild.ID, "")
	if bypassed {
		s.recordAudit(ctx, owner, guild.ID, "limits.bypass", "guild", &guild.ID, "instance admin bypassed guild limit")
	}
	if s.gateway != nil {
		s.gateway.SendToUser(owner.ID, "GUILD_CREATE", map[string]any{"guild_id": formatSnowflake(guild.ID)})
	}
	return guild, nil
}

// joinGuild добавляет пользователя в открытый сервер: главный сервер открыт
// всегда, остальные — если помечены как discoverable (AGENT.md 6.3).
func (s *Server) joinGuild(ctx context.Context, user *store.User, guildID uint64) error {
	guild, err := s.store.GetGuild(ctx, guildID)
	if err != nil {
		return humaError(err)
	}
	if !guild.IsMain && !guild.IsDiscoverable && !user.IsInstanceAdmin {
		return humaErrorStatus(http.StatusForbidden, "guild.invite_required", "this guild requires an invite")
	}
	settings, err := s.store.InstanceSettings(ctx)
	if err != nil {
		return humaError(err)
	}
	count, err := s.store.CountGuildMembers(ctx, guildID)
	if err != nil {
		return humaError(err)
	}
	if count >= settings.MaxMembersPerGuild && !user.IsInstanceAdmin {
		return humaErrorStatus(http.StatusForbidden, "limits.members_reached", "guild is full")
	}
	if _, err := s.store.AddGuildMember(ctx, guildID, user.ID, ""); err != nil {
		if errors.Is(err, store.ErrConflict) {
			return nil
		}
		return humaError(err)
	}
	s.invalidateGuild(guildID)
	s.postSystemMessage(ctx, s.systemChannelID(ctx, guildID), "member_join", map[string]any{
		"user_id": formatSnowflake(user.ID),
	})
	s.recordAudit(ctx, user, guildID, "member.join", "user", &user.ID, "")
	if s.gateway != nil {
		s.gateway.SendToUser(user.ID, "GUILD_CREATE", map[string]any{"guild_id": formatSnowflake(guildID)})
	}
	return nil
}

// deleteGuild удаляет сервер: главный сервер удалить нельзя (AGENT.md 6.3).
func (s *Server) deleteGuild(ctx context.Context, actor *store.User, guildID uint64) error {
	guild, err := s.store.GetGuild(ctx, guildID)
	if err != nil {
		return humaError(err)
	}
	if guild.IsMain {
		return humaErrorStatus(http.StatusForbidden, "guild.main_protected", "main guild cannot be deleted")
	}
	if err := s.store.DeleteGuild(ctx, guildID); err != nil {
		return humaError(err)
	}
	s.invalidateGuild(guildID)
	s.recordAudit(ctx, actor, 0, "guild.delete", "guild", &guildID, "")
	if s.gateway != nil {
		s.gateway.Dispatch("GUILD_DELETE", map[string]any{"guild_id": formatSnowflake(guildID)})
	}
	return nil
}