/**
 * Creates an isolated in-memory SQLite DB with the full schema applied.
 * Use this in tests instead of the shared `db` singleton.
 */
import Database, { type Database as BetterSqlite3Database } from 'better-sqlite3';
import { drizzle } from 'drizzle-orm/better-sqlite3';
import * as schema from '../db/schema.js';

type DrizzleDb = ReturnType<typeof drizzle<typeof schema>>;

export function makeTestDb(): DrizzleDb & { rawSqlite: BetterSqlite3Database } {
  const sqlite = new Database(':memory:');
  sqlite.pragma('foreign_keys = ON');

  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,
      token_status TEXT NOT NULL DEFAULT 'active',
      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,
      dwell_ms INTEGER,
      reward_milli INTEGER,
      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,
      prompt_version TEXT,
      llm_model TEXT,
      tip_kind TEXT
    );

    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 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 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
    );
  `);

  const db = drizzle(sqlite, { schema });
  // `sqlite` is exposed as `rawSqlite` so tests that mock `../db/index.js`
  // can provide the same `{ db, rawSqlite }` shape as the prod module.
  return Object.assign(db, { rawSqlite: sqlite });
}

export type TestDb = ReturnType<typeof makeTestDb>;