import Database from 'better-sqlite3';
import { drizzle } from 'drizzle-orm/better-sqlite3';
import * as schema from './schema.js';
import { config } from '../config.js';

const sqlite = new Database(config.DATABASE_PATH);
sqlite.pragma('journal_mode = WAL');
sqlite.pragma('foreign_keys = ON');

export const db = drizzle(sqlite, { schema });
// Raw sqlite client — used by the SQL runner endpoint.
// eslint-disable-next-line @typescript-eslint/no-explicit-any
export const rawSqlite: any = sqlite;

export function runMigrations() {
  sqlite.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 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
    );
  `);

  // 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`,
  ]) {
    try { sqlite.exec(stmt); } catch { /* column already exists */ }
  }

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