import Database from 'better-sqlite3'
import { join } from 'path'
import { existsSync, mkdirSync } from 'fs'
import { dirname } from 'path'

let db: Database.Database

export async function getDatabase() {
  if (!db) {
    const dbPath = process.env.NODE_ENV === 'production'
      ? '/data/sermons.db'
      : './data/sermons.db'

    // Ensure directory exists
    const dir = dirname(dbPath)
    if (!existsSync(dir)) {
      mkdirSync(dir, { recursive: true })
    }

    db = new Database(dbPath)
    await initializeDatabase(db)
  }
  return db
}

async function initializeDatabase(db: Database.Database) {
  // Create sermons table
  db.exec(`
    CREATE TABLE IF NOT EXISTS sermons (
      id INTEGER PRIMARY KEY AUTOINCREMENT,
      title TEXT NOT NULL,
      date TEXT NOT NULL,
      slug TEXT UNIQUE NOT NULL,
      bible_references TEXT,
      personal_application TEXT,
      pastor_challenge TEXT,
      created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
      updated_at DATETIME DEFAULT CURRENT_TIMESTAMP
    )
  `)

  // Create users table for authentication
  db.exec(`
    CREATE TABLE IF NOT EXISTS users (
      id INTEGER PRIMARY KEY AUTOINCREMENT,
      username TEXT UNIQUE NOT NULL,
      password_hash TEXT NOT NULL,
      created_at DATETIME DEFAULT CURRENT_TIMESTAMP
    )
  `)

  // Note: Admin user creation is handled in auth.ts to avoid circular dependencies
}

export function closeDatabase() {
  if (db) {
    db.close()
    db = null
  }
}