package server

import (
	"context"
	"encoding/json"
	"net/http"
	"net/http/httptest"
	"strings"
	"testing"
)

func doJSON(t *testing.T, srv *Server, method, path, body string, cookies ...*http.Cookie) *httptest.ResponseRecorder {
	t.Helper()
	req := httptest.NewRequestWithContext(context.Background(), method, path, strings.NewReader(body))
	req.Header.Set("Content-Type", "application/json")
	for _, cookie := range cookies {
		req.AddCookie(cookie)
	}
	rec := httptest.NewRecorder()
	srv.Handler().ServeHTTP(rec, req)
	return rec
}

func TestRegisterEndpointCreatesSession(t *testing.T) {
	srv, _ := newTestServer(t)
	rec := doJSON(t, srv, http.MethodPost, "/api/v1/auth/register",
		`{"username":"api_user","email":"api@example.com","password":"correct-horse-battery"}`)

	if rec.Code != http.StatusOK {
		t.Fatalf("status = %d, body = %s", rec.Code, rec.Body.String())
	}
	var payload struct {
		User struct {
			ID          string `json:"id"`
			Username    string `json:"username"`
			DisplayName string `json:"display_name"`
		} `json:"user"`
	}
	if err := json.Unmarshal(rec.Body.Bytes(), &payload); err != nil {
		t.Fatalf("decode body: %v", err)
	}
	if payload.User.Username != "api_user" || payload.User.ID == "" {
		t.Fatalf("unexpected user payload: %s", rec.Body.String())
	}

	cookies := rec.Result().Cookies()
	if len(cookies) == 0 || cookies[0].Name != sessionCookieName {
		t.Fatalf("session cookie is missing: %v", cookies)
	}
	if !cookies[0].HttpOnly {
		t.Fatal("session cookie must be HttpOnly")
	}

	// С полученной cookie доступен профиль.
	me := doJSON(t, srv, http.MethodGet, "/api/v1/users/@me", "", cookies[0])
	if me.Code != http.StatusOK {
		t.Fatalf("GET /users/@me = %d, body = %s", me.Code, me.Body.String())
	}
}

func TestLoginEndpointErrors(t *testing.T) {
	srv, _ := newTestServer(t)
	doJSON(t, srv, http.MethodPost, "/api/v1/auth/register",
		`{"username":"login_user","email":"login@example.com","password":"correct-horse-battery"}`)

	rec := doJSON(t, srv, http.MethodPost, "/api/v1/auth/login",
		`{"email":"login@example.com","password":"wrong-password"}`)
	if rec.Code != http.StatusUnauthorized {
		t.Fatalf("wrong password status = %d, want 401", rec.Code)
	}
	if !strings.Contains(rec.Body.String(), "invalid credentials") {
		t.Fatalf("unexpected error body: %s", rec.Body.String())
	}

	rec = doJSON(t, srv, http.MethodPost, "/api/v1/auth/login",
		`{"email":"login@example.com","password":"correct-horse-battery"}`)
	if rec.Code != http.StatusOK {
		t.Fatalf("valid login status = %d, body = %s", rec.Code, rec.Body.String())
	}
}

func TestAuthenticatedEndpointsRequireSession(t *testing.T) {
	srv, _ := newTestServer(t)
	for _, path := range []string{"/api/v1/users/@me", "/api/v1/auth/sessions"} {
		rec := doJSON(t, srv, http.MethodGet, path, "")
		if rec.Code != http.StatusUnauthorized {
			t.Fatalf("GET %s without session = %d, want 401", path, rec.Code)
		}
	}
}

func TestValidationRejectsShortPassword(t *testing.T) {
	srv, _ := newTestServer(t)
	rec := doJSON(t, srv, http.MethodPost, "/api/v1/auth/register",
		`{"username":"short_user","email":"short@example.com","password":"short"}`)
	if rec.Code == http.StatusOK {
		t.Fatalf("short password accepted: %s", rec.Body.String())
	}
}

func TestOpenAPIDocumentsAuthEndpoints(t *testing.T) {
	srv, _ := newTestServer(t)
	rec := doJSON(t, srv, http.MethodGet, "/api/v1/openapi.json", "")
	if rec.Code != http.StatusOK {
		t.Fatalf("openapi status = %d", rec.Code)
	}
	var doc struct {
		Paths map[string]any `json:"paths"`
	}
	if err := json.Unmarshal(rec.Body.Bytes(), &doc); err != nil {
		t.Fatalf("decode openapi: %v", err)
	}
	paths := []string{
		"/auth/register", "/auth/login", "/auth/logout", "/auth/sessions",
		"/users/@me", "/auth/2fa/setup", "/meta",
		// Ручки Фазы 1, сгенерированные huma.
		"/users/@me/guilds", "/guilds", "/guilds/{guild_id}", "/guilds/{guild_id}/channels",
		"/guilds/{guild_id}/members", "/guilds/{guild_id}/roles", "/instance",
		"/instance/settings", "/instance/guilds", "/instance/users", "/instance/audit",
	}
	for _, path := range paths {
		if _, ok := doc.Paths[path]; !ok {
			t.Errorf("openapi is missing %s", path)
		}
	}
}