-- 0001_init.sql
CREATE TABLE IF NOT EXISTS users (
    id BIGSERIAL PRIMARY KEY,
    username TEXT NOT NULL UNIQUE,
    display_name TEXT NOT NULL DEFAULT '',
    password_hash TEXT NOT NULL,
    avatar TEXT NOT NULL DEFAULT '',
    created_at TIMESTAMPTZ NOT NULL DEFAULT now()
);

CREATE TABLE IF NOT EXISTS sessions (
    id BIGSERIAL PRIMARY KEY,
    user_id BIGINT NOT NULL REFERENCES users(id) ON DELETE CASCADE,
    refresh_hash TEXT NOT NULL,
    user_agent TEXT NOT NULL DEFAULT '',
    ip TEXT NOT NULL DEFAULT '',
    expires_at TIMESTAMPTZ NOT NULL,
    revoked_at TIMESTAMPTZ,
    created_at TIMESTAMPTZ NOT NULL DEFAULT now()
);
CREATE INDEX IF NOT EXISTS idx_sessions_user ON sessions(user_id);
CREATE INDEX IF NOT EXISTS idx_sessions_refresh_hash ON sessions(refresh_hash);

CREATE TABLE IF NOT EXISTS contacts (
    owner_id BIGINT NOT NULL REFERENCES users(id) ON DELETE CASCADE,
    contact_id BIGINT NOT NULL REFERENCES users(id) ON DELETE CASCADE,
    created_at TIMESTAMPTZ NOT NULL DEFAULT now(),
    PRIMARY KEY(owner_id, contact_id),
    CHECK(owner_id <> contact_id)
);

CREATE TABLE IF NOT EXISTS conversations (
    id BIGSERIAL PRIMARY KEY,
    type TEXT NOT NULL CHECK(type IN ('dm','group')),
    created_at TIMESTAMPTZ NOT NULL DEFAULT now()
);

CREATE TABLE IF NOT EXISTS conversation_members (
    conversation_id BIGINT NOT NULL REFERENCES conversations(id) ON DELETE CASCADE,
    user_id BIGINT NOT NULL REFERENCES users(id) ON DELETE CASCADE,
    last_read_at TIMESTAMPTZ,
    joined_at TIMESTAMPTZ NOT NULL DEFAULT now(),
    PRIMARY KEY(conversation_id, user_id)
);
CREATE INDEX IF NOT EXISTS idx_members_user ON conversation_members(user_id);

CREATE TABLE IF NOT EXISTS messages (
    id BIGSERIAL PRIMARY KEY,
    conversation_id BIGINT NOT NULL REFERENCES conversations(id) ON DELETE CASCADE,
    sender_id BIGINT NOT NULL REFERENCES users(id) ON DELETE CASCADE,
    body TEXT NOT NULL DEFAULT '',
    created_at TIMESTAMPTZ NOT NULL DEFAULT now(),
    edited_at TIMESTAMPTZ,
    deleted_at TIMESTAMPTZ
);
CREATE INDEX IF NOT EXISTS idx_messages_conversation_id ON messages(conversation_id, id DESC);