-- +goose Up
-- Фаза 2: сообщения, реакции, закрепления, read states и полнотекстовый поиск
-- (AGENT.md 6.1, 7.6, 7.15).

CREATE TABLE messages (
    id               INTEGER PRIMARY KEY,
    channel_id       INTEGER NOT NULL REFERENCES channels (id) ON DELETE CASCADE,
    author_id        INTEGER REFERENCES users (id) ON DELETE SET NULL,
    content          TEXT    NOT NULL DEFAULT '',
    reply_to_id      INTEGER REFERENCES messages (id) ON DELETE SET NULL,
    type             TEXT    NOT NULL DEFAULT 'default',
    -- Вложения хранятся списком метаданных: сами файлы лежат на диске (7.7).
    attachments_json TEXT    NOT NULL DEFAULT '[]',
    mentions_json    TEXT    NOT NULL DEFAULT '[]',
    edited_at        TEXT,
    pinned           INTEGER NOT NULL DEFAULT 0,
    created_at       TEXT    NOT NULL DEFAULT (strftime('%Y-%m-%dT%H:%M:%fZ', 'now'))
);
CREATE INDEX messages_channel_idx ON messages (channel_id, id DESC);
CREATE INDEX messages_author_idx ON messages (author_id, id DESC);
CREATE INDEX messages_pinned_idx ON messages (channel_id, id) WHERE pinned = 1;

CREATE TABLE message_reactions (
    message_id INTEGER NOT NULL REFERENCES messages (id) ON DELETE CASCADE,
    user_id    INTEGER NOT NULL REFERENCES users (id) ON DELETE CASCADE,
    emoji      TEXT    NOT NULL,
    created_at TEXT    NOT NULL DEFAULT (strftime('%Y-%m-%dT%H:%M:%fZ', 'now')),
    PRIMARY KEY (message_id, user_id, emoji)
);
CREATE INDEX message_reactions_emoji_idx ON message_reactions (message_id, emoji);

-- Состояние прочтения на пользователя и комнату: синхронизируется между
-- устройствами через Gateway (AGENT.md 7.16).
CREATE TABLE channel_read_states (
    user_id         INTEGER NOT NULL REFERENCES users (id) ON DELETE CASCADE,
    channel_id      INTEGER NOT NULL REFERENCES channels (id) ON DELETE CASCADE,
    last_message_id INTEGER NOT NULL DEFAULT 0,
    mention_count   INTEGER NOT NULL DEFAULT 0,
    updated_at      TEXT    NOT NULL DEFAULT (strftime('%Y-%m-%dT%H:%M:%fZ', 'now')),
    PRIMARY KEY (user_id, channel_id)
);
CREATE INDEX channel_read_states_channel_idx ON channel_read_states (channel_id);

-- Вложения: файл регистрируется отдельно от сообщения, чтобы работали
-- предпросмотры и очистка сирот (AGENT.md 7.7).
CREATE TABLE files (
    id            INTEGER PRIMARY KEY,
    uploader_id   INTEGER REFERENCES users (id) ON DELETE SET NULL,
    guild_id      INTEGER REFERENCES guilds (id) ON DELETE CASCADE,
    channel_id    INTEGER REFERENCES channels (id) ON DELETE CASCADE,
    message_id    INTEGER REFERENCES messages (id) ON DELETE CASCADE,
    filename      TEXT    NOT NULL,
    content_type  TEXT    NOT NULL DEFAULT 'application/octet-stream',
    size_bytes    INTEGER NOT NULL DEFAULT 0,
    width         INTEGER NOT NULL DEFAULT 0,
    height        INTEGER NOT NULL DEFAULT 0,
    storage_path  TEXT    NOT NULL DEFAULT '',
    sha256        TEXT    NOT NULL DEFAULT '',
    created_at    TEXT    NOT NULL DEFAULT (strftime('%Y-%m-%dT%H:%M:%fZ', 'now'))
);
CREATE INDEX files_message_idx ON files (message_id);

-- Полнотекстовый поиск по сообщениям (AGENT.md 7.15): индексируем содержимое,
-- права проверяются при запросе.
CREATE VIRTUAL TABLE messages_fts USING fts5 (
    content,
    content = 'messages',
    content_rowid = 'id',
    tokenize = 'unicode61 remove_diacritics 2'
);

-- Триггеры содержат `;` внутри тела: goose требует явных границ оператора.
-- +goose StatementBegin
CREATE TRIGGER messages_fts_insert AFTER INSERT ON messages BEGIN
    INSERT INTO messages_fts (rowid, content) VALUES (new.id, new.content);
END;
-- +goose StatementEnd
-- +goose StatementBegin
CREATE TRIGGER messages_fts_delete AFTER DELETE ON messages BEGIN
    INSERT INTO messages_fts (messages_fts, rowid, content) VALUES ('delete', old.id, old.content);
END;
-- +goose StatementEnd
-- +goose StatementBegin
CREATE TRIGGER messages_fts_update AFTER UPDATE OF content ON messages BEGIN
    INSERT INTO messages_fts (messages_fts, rowid, content) VALUES ('delete', old.id, old.content);
    INSERT INTO messages_fts (rowid, content) VALUES (new.id, new.content);
END;
-- +goose StatementEnd

-- Приглашения (AGENT.md 7.9): код, лимит использований и срок жизни.
CREATE TABLE invites (
    code        TEXT    PRIMARY KEY,
    guild_id    INTEGER NOT NULL REFERENCES guilds (id) ON DELETE CASCADE,
    channel_id  INTEGER REFERENCES channels (id) ON DELETE SET NULL,
    creator_id  INTEGER REFERENCES users (id) ON DELETE SET NULL,
    max_uses    INTEGER NOT NULL DEFAULT 0,
    uses        INTEGER NOT NULL DEFAULT 0,
    max_age_sec INTEGER NOT NULL DEFAULT 0,
    expires_at  TEXT,
    created_at  TEXT    NOT NULL DEFAULT (strftime('%Y-%m-%dT%H:%M:%fZ', 'now'))
);
CREATE INDEX invites_guild_idx ON invites (guild_id, created_at DESC);
CREATE INDEX invites_expires_idx ON invites (expires_at);

-- +goose Down
DROP TABLE invites;
DROP TRIGGER messages_fts_update;
DROP TRIGGER messages_fts_delete;
DROP TRIGGER messages_fts_insert;
DROP TABLE messages_fts;
DROP TABLE files;
DROP TABLE channel_read_states;
DROP TABLE message_reactions;
DROP TABLE messages;