import Database from 'better-sqlite3'
import { mkdirSync } from 'fs'
import path from 'path'
import { fileURLToPath } from 'url'

const __dirname = path.dirname(fileURLToPath(import.meta.url))
const dataDir = path.join(__dirname, 'data')
mkdirSync(dataDir, { recursive: true })

const db = new Database(path.join(dataDir, 'stories.db'))
db.pragma('journal_mode = WAL')
db.pragma('foreign_keys = ON')

db.exec(`
  CREATE TABLE IF NOT EXISTS users (
    id       INTEGER PRIMARY KEY AUTOINCREMENT,
    name     TEXT NOT NULL,
    username TEXT UNIQUE NOT NULL COLLATE NOCASE,
    password TEXT NOT NULL,
    created_at DATETIME DEFAULT CURRENT_TIMESTAMP
  );

  CREATE TABLE IF NOT EXISTS stories (
    id          INTEGER PRIMARY KEY AUTOINCREMENT,
    user_id     INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE,
    title       TEXT NOT NULL DEFAULT 'Untitled Story',
    content     TEXT DEFAULT '{}',
    cover_image TEXT,
    updated_at  DATETIME DEFAULT CURRENT_TIMESTAMP,
    created_at  DATETIME DEFAULT CURRENT_TIMESTAMP
  );

  CREATE TABLE IF NOT EXISTS images (
    id       INTEGER PRIMARY KEY AUTOINCREMENT,
    user_id  INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE,
    filename TEXT NOT NULL,
    created_at DATETIME DEFAULT CURRENT_TIMESTAMP
  );

  CREATE TABLE IF NOT EXISTS notes (
    id         INTEGER PRIMARY KEY AUTOINCREMENT,
    story_id   INTEGER NOT NULL REFERENCES stories(id) ON DELETE CASCADE,
    user_id    INTEGER NOT NULL REFERENCES users(id)   ON DELETE CASCADE,
    title      TEXT    NOT NULL DEFAULT 'Untitled Note',
    content    TEXT    DEFAULT '{}',
    updated_at DATETIME DEFAULT CURRENT_TIMESTAMP,
    created_at DATETIME DEFAULT CURRENT_TIMESTAMP
  );
`)

// Migrate: rename email -> username for existing databases
const userCols = db.pragma('table_info(users)').map(c => c.name)
if (userCols.includes('email') && !userCols.includes('username')) {
  db.exec('ALTER TABLE users RENAME COLUMN email TO username')
}

export default db