CREATE TABLE users (
  id            TEXT PRIMARY KEY,
  kind          TEXT NOT NULL CHECK (kind IN ('guest','member')),
  nickname      TEXT NOT NULL,
  avatar_url    TEXT,
  use_avatar    INTEGER NOT NULL DEFAULT 1,
  settings_json TEXT NOT NULL DEFAULT '{}',
  nick_changed_at INTEGER,
  nick_change_count INTEGER NOT NULL DEFAULT 0,
  created_at    INTEGER NOT NULL,
  last_seen_at  INTEGER NOT NULL,
  deleted_at    INTEGER
);

CREATE TABLE oauth_accounts (
  provider         TEXT NOT NULL,
  provider_user_id TEXT NOT NULL,
  user_id          TEXT NOT NULL REFERENCES users(id) ON DELETE CASCADE,
  username         TEXT,
  created_at       INTEGER NOT NULL,
  PRIMARY KEY (provider, provider_user_id)
);
CREATE INDEX oauth_accounts_user ON oauth_accounts(user_id);

CREATE TABLE sessions (
  token_hash   TEXT PRIMARY KEY,
  user_id      TEXT NOT NULL REFERENCES users(id) ON DELETE CASCADE,
  created_at   INTEGER NOT NULL,
  expires_at   INTEGER NOT NULL,
  last_used_at INTEGER NOT NULL,
  user_agent   TEXT
);
CREATE INDEX sessions_user ON sessions(user_id);

CREATE TABLE rooms (
  id          TEXT PRIMARY KEY,
  code        TEXT NOT NULL,
  host_id     TEXT NOT NULL,
  game_id     TEXT NOT NULL,
  status      TEXT NOT NULL CHECK (status IN ('lobby','playing','finished','paused','broken','closed')),
  visibility  TEXT NOT NULL,
  config_json TEXT NOT NULL,
  created_at  INTEGER NOT NULL,
  updated_at  INTEGER NOT NULL,
  closed_at   INTEGER
);
CREATE UNIQUE INDEX rooms_open_code ON rooms(code) WHERE status <> 'closed';
CREATE INDEX rooms_status ON rooms(status);

CREATE TABLE room_state (
  room_id    TEXT PRIMARY KEY REFERENCES rooms(id) ON DELETE CASCADE,
  seq        INTEGER NOT NULL,
  state_json TEXT NOT NULL,
  updated_at INTEGER NOT NULL
);

CREATE TABLE room_log (
  room_id   TEXT NOT NULL,
  seq       INTEGER NOT NULL,
  game_no   INTEGER NOT NULL,
  actor_id  TEXT,
  kind      TEXT NOT NULL,
  data_json TEXT NOT NULL,
  at        INTEGER NOT NULL,
  PRIMARY KEY (room_id, seq)
);

CREATE TABLE games (
  id           TEXT PRIMARY KEY,
  room_id      TEXT NOT NULL,
  game_no      INTEGER NOT NULL,
  game_id      TEXT NOT NULL,
  options_json TEXT NOT NULL,
  seed_hash    TEXT NOT NULL,
  seed         TEXT,
  started_at   INTEGER NOT NULL,
  ended_at     INTEGER,
  end_reason   TEXT,
  result_json  TEXT
);
CREATE INDEX games_room ON games(room_id);

CREATE TABLE game_players (
  game_pk TEXT NOT NULL REFERENCES games(id) ON DELETE CASCADE,
  user_id TEXT NOT NULL,
  seat    INTEGER NOT NULL,
  rank    INTEGER,
  score   REAL,
  PRIMARY KEY (game_pk, user_id)
);
CREATE INDEX game_players_user ON game_players(user_id);

CREATE TABLE user_stats (
  user_id TEXT NOT NULL,
  game_id TEXT NOT NULL,
  played  INTEGER NOT NULL DEFAULT 0,
  wins    INTEGER NOT NULL DEFAULT 0,
  draws   INTEGER NOT NULL DEFAULT 0,
  PRIMARY KEY (user_id, game_id)
);