/**
 * Schema migrations and one-shot backfills for the API DB.
 *
 * Kept separate from db/index.ts so tests can apply migrations to an in-memory
 * SQLite handle without triggering the singleton DB connection at import time.
 */
import type { Database as BetterSqlite3Database } from 'better-sqlite3';

export function runMigrations(handle: BetterSqlite3Database) {
  handle.exec(`
    CREATE TABLE IF NOT EXISTS users (
      id TEXT PRIMARY KEY,
      email TEXT NOT NULL UNIQUE,
      name TEXT,
      image TEXT,
      google_id TEXT UNIQUE,
      role TEXT NOT NULL DEFAULT 'user',
      consent_given INTEGER NOT NULL DEFAULT 0,
      consent_at TEXT,
      created_at TEXT NOT NULL,
      deleted_at TEXT
    );

    CREATE TABLE IF NOT EXISTS integration_tokens (
      id TEXT PRIMARY KEY,
      user_id TEXT NOT NULL REFERENCES users(id),
      provider TEXT NOT NULL,
      access_token TEXT NOT NULL,
      refresh_token TEXT,
      expires_at TEXT,
      connected_at TEXT NOT NULL,
      UNIQUE(user_id, provider)
    );

    CREATE TABLE IF NOT EXISTS tip_feedback (
      id TEXT PRIMARY KEY,
      user_id TEXT NOT NULL REFERENCES users(id),
      tip_id TEXT NOT NULL,
      action TEXT NOT NULL,
      source_id TEXT,
      created_at TEXT NOT NULL
    );

    CREATE TABLE IF NOT EXISTS tip_views (
      id TEXT PRIMARY KEY,
      user_id TEXT NOT NULL REFERENCES users(id),
      tip_id TEXT NOT NULL,
      served_at TEXT NOT NULL
    );

    CREATE TABLE IF NOT EXISTS push_subscriptions (
      id TEXT PRIMARY KEY,
      user_id TEXT NOT NULL REFERENCES users(id),
      endpoint TEXT NOT NULL UNIQUE,
      p256dh TEXT NOT NULL,
      auth TEXT NOT NULL,
      created_at TEXT NOT NULL
    );

    CREATE TABLE IF NOT EXISTS sessions (
      id TEXT PRIMARY KEY,
      user_id TEXT NOT NULL REFERENCES users(id),
      expires_at TEXT NOT NULL,
      created_at TEXT NOT NULL
    );

    CREATE TABLE IF NOT EXISTS admin_actions (
      id TEXT PRIMARY KEY,
      admin_id TEXT NOT NULL REFERENCES users(id),
      action TEXT NOT NULL,
      target_type TEXT,
      target_id TEXT,
      detail TEXT,
      created_at TEXT NOT NULL
    );

    CREATE TABLE IF NOT EXISTS tip_scores (
      id TEXT PRIMARY KEY,
      user_id TEXT NOT NULL REFERENCES users(id),
      tip_id TEXT NOT NULL,
      policy TEXT NOT NULL,
      ml_score INTEGER,
      features_json TEXT,
      candidate_count INTEGER,
      latency_ms INTEGER,
      served_at TEXT NOT NULL
    );

    CREATE TABLE IF NOT EXISTS saved_queries (
      id TEXT PRIMARY KEY,
      admin_id TEXT NOT NULL REFERENCES users(id),
      name TEXT NOT NULL,
      sql TEXT NOT NULL,
      created_at TEXT NOT NULL
    );

    CREATE TABLE IF NOT EXISTS user_profile_features (
      user_id TEXT NOT NULL REFERENCES users(id),
      name TEXT NOT NULL,
      value REAL,
      value_text TEXT,
      updated_at TEXT NOT NULL,
      ttl_sec INTEGER NOT NULL,
      PRIMARY KEY (user_id, name)
    );

    CREATE TABLE IF NOT EXISTS sim_runs (
      id TEXT PRIMARY KEY,
      policy_a TEXT NOT NULL,
      policy_b TEXT NOT NULL,
      n_users INTEGER NOT NULL,
      n_rounds INTEGER NOT NULL,
      tasks_per_round INTEGER NOT NULL DEFAULT 8,
      use_llm INTEGER NOT NULL DEFAULT 0,
      status TEXT NOT NULL DEFAULT 'pending',
      summary_json TEXT,
      winner TEXT,
      persona_breakdown_json TEXT,
      created_at TEXT NOT NULL,
      finished_at TEXT
    );

    CREATE TABLE IF NOT EXISTS sim_events (
      id TEXT PRIMARY KEY,
      run_id TEXT NOT NULL REFERENCES sim_runs(id),
      round INTEGER NOT NULL,
      user_id TEXT NOT NULL,
      persona TEXT NOT NULL,
      policy TEXT NOT NULL,
      tip_content TEXT NOT NULL,
      priority INTEGER NOT NULL,
      is_overdue INTEGER NOT NULL,
      action TEXT NOT NULL,
      dwell_ms INTEGER,
      reward_milli INTEGER NOT NULL,
      hour INTEGER NOT NULL,
      day_of_week INTEGER NOT NULL,
      created_at TEXT NOT NULL
    );

    CREATE TABLE IF NOT EXISTS agent_outputs (
      id TEXT PRIMARY KEY,
      user_id TEXT NOT NULL REFERENCES users(id),
      agent_id TEXT NOT NULL,
      prompt_text TEXT NOT NULL,
      signals_snapshot TEXT,
      computed_at TEXT NOT NULL,
      expires_at TEXT NOT NULL,
      agent_version TEXT NOT NULL
    );
    CREATE INDEX IF NOT EXISTS idx_agent_outputs_user_agent_exp
      ON agent_outputs(user_id, agent_id, expires_at DESC);

    CREATE TABLE IF NOT EXISTS user_preferences (
      user_id TEXT NOT NULL REFERENCES users(id),
      scope TEXT NOT NULL,
      key TEXT NOT NULL,
      value_json TEXT NOT NULL,
      source TEXT NOT NULL DEFAULT 'user',
      updated_at TEXT NOT NULL,
      PRIMARY KEY (user_id, scope, key)
    );

    CREATE TABLE IF NOT EXISTS user_consents (
      user_id TEXT NOT NULL REFERENCES users(id),
      consent_key TEXT NOT NULL,
      granted_at TEXT NOT NULL,
      revoked_at TEXT,
      PRIMARY KEY (user_id, consent_key)
    );

    CREATE TABLE IF NOT EXISTS user_contexts (
      user_id TEXT NOT NULL REFERENCES users(id),
      name TEXT NOT NULL,
      active INTEGER NOT NULL DEFAULT 0,
      schedule_json TEXT,
      created_at TEXT NOT NULL,
      PRIMARY KEY (user_id, name)
    );
  `);

  // Additive column migrations — safe to run on existing DBs.
  // SQLite doesn't support IF NOT EXISTS on ALTER TABLE; we ignore the error if already present.
  for (const stmt of [
    `ALTER TABLE users ADD COLUMN role TEXT NOT NULL DEFAULT 'user'`,
    `ALTER TABLE push_subscriptions ADD COLUMN created_at TEXT NOT NULL DEFAULT ''`,
    `ALTER TABLE tip_feedback ADD COLUMN dwell_ms INTEGER`,
    `ALTER TABLE tip_feedback ADD COLUMN reward_milli INTEGER`,
    `ALTER TABLE integration_tokens ADD COLUMN token_status TEXT NOT NULL DEFAULT 'active'`,
    `ALTER TABLE tip_scores ADD COLUMN prompt_version TEXT`,
    `ALTER TABLE tip_scores ADD COLUMN llm_model TEXT`,
    `ALTER TABLE tip_scores ADD COLUMN tip_kind TEXT`,
    `ALTER TABLE sim_runs ADD COLUMN mlflow_run_id TEXT`,
    `ALTER TABLE sim_runs ADD COLUMN judge_mode TEXT NOT NULL DEFAULT 'rule'`,
    `ALTER TABLE sim_runs ADD COLUMN n_policies INTEGER NOT NULL DEFAULT 2`,
    `ALTER TABLE users ADD COLUMN tone TEXT`,
    `ALTER TABLE users ADD COLUMN tip_kinds_json TEXT`,
  ]) {
    try { handle.exec(stmt); } catch { /* column already exists */ }
  }

  // Backfill: ADR-0014 collapses users.consent_given into user_consents
  // (consent_key='data:core'). Idempotent — INSERT OR IGNORE on the
  // composite PK skips users already migrated. Stays in place until the
  // column is dropped (PR 6 of the migration plan).
  handle.exec(`
    INSERT OR IGNORE INTO user_consents (user_id, consent_key, granted_at)
    SELECT id, 'data:core', COALESCE(consent_at, created_at)
    FROM users
    WHERE consent_given = 1
  `);

  // Seed first admin from env (ADMIN_SEED_EMAIL).
  const seedEmail = process.env.ADMIN_SEED_EMAIL;
  if (seedEmail) {
    handle.prepare(`UPDATE users SET role = 'admin' WHERE email = ? AND role = 'user'`).run(seedEmail);
  }
}