-- LifeRPG DB schema (initial draft)

PRAGMA foreign_keys = ON;

CREATE TABLE users (
  id INTEGER PRIMARY KEY AUTOINCREMENT,
  email TEXT UNIQUE NOT NULL,
  password_hash TEXT,
  display_name TEXT,
  created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
  updated_at DATETIME DEFAULT CURRENT_TIMESTAMP
);

CREATE TABLE profiles (
  id INTEGER PRIMARY KEY AUTOINCREMENT,
  user_id INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE,
  key TEXT NOT NULL,
  value TEXT,
  UNIQUE(user_id, key)
);

CREATE TABLE projects (
  id INTEGER PRIMARY KEY AUTOINCREMENT,
  user_id INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE,
  title TEXT NOT NULL,
  description TEXT,
  created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
  updated_at DATETIME DEFAULT CURRENT_TIMESTAMP
);

CREATE TABLE habits (
  id INTEGER PRIMARY KEY AUTOINCREMENT,
  project_id INTEGER REFERENCES projects(id) ON DELETE SET NULL,
  user_id INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE,
  title TEXT NOT NULL,
  notes TEXT,
  cadence TEXT, -- e.g., daily, weekly
  difficulty INTEGER DEFAULT 1,
  xp_reward INTEGER DEFAULT 10,
  created_at DATETIME DEFAULT CURRENT_TIMESTAMP
);

CREATE TABLE logs (
  id INTEGER PRIMARY KEY AUTOINCREMENT,
  habit_id INTEGER REFERENCES habits(id) ON DELETE CASCADE,
  user_id INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE,
  action TEXT,
  timestamp DATETIME DEFAULT CURRENT_TIMESTAMP
);

CREATE TABLE achievements (
  id INTEGER PRIMARY KEY AUTOINCREMENT,
  user_id INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE,
  name TEXT NOT NULL,
  description TEXT,
  earned_at DATETIME
);

CREATE TABLE integrations (
  id INTEGER PRIMARY KEY AUTOINCREMENT,
  user_id INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE,
  provider TEXT NOT NULL,
  external_id TEXT,
  config TEXT, -- JSON blob for adapter config
  created_at DATETIME DEFAULT CURRENT_TIMESTAMP
);

CREATE TABLE oauth_tokens (
  id INTEGER PRIMARY KEY AUTOINCREMENT,
  integration_id INTEGER REFERENCES integrations(id) ON DELETE CASCADE,
  access_token TEXT,
  refresh_token TEXT,
  scope TEXT,
  expires_at INTEGER
);

CREATE TABLE change_log (
  id INTEGER PRIMARY KEY AUTOINCREMENT,
  user_id INTEGER,
  entity TEXT,
  entity_id INTEGER,
  action TEXT,
  payload TEXT,
  created_at DATETIME DEFAULT CURRENT_TIMESTAMP
);