CREATE TABLE IF NOT EXISTS user_ (
  id SERIAL PRIMARY KEY,
  uuid UUID UNIQUE,
  email TEXT UNIQUE,
  username TEXT NOT NULL UNIQUE,
  avatar_url TEXT,
  password_hash TEXT NOT NULL
);

CREATE TABLE IF NOT EXISTS friendship_ (
  user_first INT NOT NULL REFERENCES user_(id) ON DELETE CASCADE,
  user_second INT NOT NULL REFERENCES user_(id) ON DELETE CASCADE,
  created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
  PRIMARY KEY (user_first, user_second)
);

CREATE TABLE IF NOT EXISTS friend_request_ (
  sender INT NOT NULL REFERENCES user_(id) ON DELETE CASCADE,
  receiver INT NOT NULL REFERENCES user_(id) ON DELETE CASCADE,
  sent_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
  PRIMARY KEY (sender, receiver),
  CHECK (sender <> receiver)
);

CREATE TABLE IF NOT EXISTS room_ (
  id SERIAL PRIMARY KEY,
  uuid UUID UNIQUE,
  owner INT NOT NULL REFERENCES user_(id),
  name TEXT NOT NULL,
  global BOOLEAN NOT NULL DEFAULT false
);

CREATE TABLE IF NOT EXISTS membership_ (
  user_id INT REFERENCES user_(id),
  room INT REFERENCES room_(id),
  last_read_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
  PRIMARY KEY (user_id, room)
);

CREATE TABLE IF NOT EXISTS room_invite_ (
  sender INT NOT NULL REFERENCES user_(id) ON DELETE CASCADE,
  receiver INT NOT NULL REFERENCES user_(id) ON DELETE CASCADE,
  room INT NOT NULL,
  sent_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
  PRIMARY KEY (sender, receiver),
  CHECK (sender <> receiver)
);

CREATE TABLE IF NOT EXISTS message_ (
  id BIGSERIAL PRIMARY KEY,
  uuid UUID NOT NULL,
  sender INT REFERENCES user_(id) NOT NULL,
  room INT REFERENCES room_(id) NOT NULL,
  message_type VARCHAR(32) NOT NULL,
  content TEXT NOT NULL,
  sent_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP
);

CREATE TABLE ws_token_ (
  token TEXT PRIMARY KEY,
  expires_at TIMESTAMPTZ NOT NULL
);

-- ==== INDICES ====
CREATE INDEX idx_message_room_sent_at ON message_ (room, sent_at);
CREATE UNIQUE INDEX idx_membership_user_room ON membership_ (user_id, room) INCLUDE (last_read_at);

-- Timestamp creation
-- CREATE OR REPLACE FUNCTION create_notification_timestamp()
-- RETURNS trigger
-- AS $$
-- BEGIN
--   NEW.sent_at := CURRENT_TIMESTAMP;
--   RETURN NEW;
-- END;
-- $$ LANGUAGE plpgsql;
--
-- CREATE OR REPLACE TRIGGER insert_message
-- BEFORE INSERT ON message_
-- FOR EACH ROW
-- EXECUTE FUNCTION create_notification_timestamp();
--
-- CREATE OR REPLACE TRIGGER insert_room_invite
-- BEFORE INSERT ON room_invite_
-- FOR EACH ROW
-- EXECUTE FUNCTION create_notification_timestamp();
--
-- CREATE OR REPLACE FUNCTION create_membership_timestamp()
-- RETURNS trigger
-- AS $$
-- BEGIN
--   NEW.last_read_at = CURRENT_TIMESTAMP;
--   RETURN NEW;
-- END;
-- $$ LANGUAGE plpgsql;
--
-- CREATE OR REPLACE TRIGGER insert_membership
-- BEFORE INSERT ON membership_
-- FOR EACH ROW
-- EXECUTE FUNCTION create_membership_timestamp();