-- Чаты и сообщения
CREATE TABLE IF NOT EXISTS chats (
    id          UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
    user_a      UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
    user_b      UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
    created_at  TIMESTAMPTZ DEFAULT NOW(),
    last_msg_at TIMESTAMPTZ DEFAULT NOW(),
    UNIQUE (user_a, user_b),
    CHECK (user_a < user_b)
);

CREATE INDEX IF NOT EXISTS idx_chats_user_a ON chats(user_a, last_msg_at DESC);
CREATE INDEX IF NOT EXISTS idx_chats_user_b ON chats(user_b, last_msg_at DESC);

CREATE TABLE IF NOT EXISTS messages (
    id          UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
    chat_id     UUID NOT NULL REFERENCES chats(id) ON DELETE CASCADE,
    sender_id   UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
    body        TEXT,
    photo_url   TEXT,
    read        BOOLEAN NOT NULL DEFAULT FALSE,
    edited      BOOLEAN NOT NULL DEFAULT FALSE,
    deleted     BOOLEAN NOT NULL DEFAULT FALSE,
    created_at  TIMESTAMPTZ DEFAULT NOW(),
    updated_at  TIMESTAMPTZ DEFAULT NOW()
);

CREATE INDEX IF NOT EXISTS idx_messages_chat ON messages(chat_id, created_at);

-- Блокировки
CREATE TABLE IF NOT EXISTS blocks (
    blocker_id  UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
    blocked_id  UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
    created_at  TIMESTAMPTZ DEFAULT NOW(),
    PRIMARY KEY (blocker_id, blocked_id)
);

-- Жалобы
CREATE TABLE IF NOT EXISTS reports (
    id           BIGSERIAL PRIMARY KEY,
    reporter_id  UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
    target_type  TEXT NOT NULL CHECK (target_type IN ('user','message','chat')),
    target_id    TEXT NOT NULL,
    reason       TEXT,
    metadata     JSONB,
    created_at   TIMESTAMPTZ DEFAULT NOW()
);

CREATE INDEX IF NOT EXISTS idx_reports_target ON reports(target_type, target_id);