import { DatabaseSync } from 'node:sqlite';
import path from 'node:path';
import fs from 'node:fs';

const DATA_DIR = process.env.DATA_DIR || path.join(process.cwd(), 'app', 'data');
const DB_PATH = path.join(DATA_DIR, 'waas.db');

let dbInstance: DatabaseSync | null = null;

export function getDb(): DatabaseSync {
  if (dbInstance) return dbInstance;

  if (!fs.existsSync(DATA_DIR)) {
    fs.mkdirSync(DATA_DIR, { recursive: true });
  }

  dbInstance = new DatabaseSync(DB_PATH);
  initSchema(dbInstance);
  return dbInstance;
}

function initSchema(db: DatabaseSync) {
  // 1. site_settings
  db.exec(`
    CREATE TABLE IF NOT EXISTS site_settings (
      key TEXT PRIMARY KEY,
      value_json TEXT NOT NULL,
      updated_at TEXT NOT NULL
    );
  `);

  // 2. pages
  db.exec(`
    CREATE TABLE IF NOT EXISTS pages (
      id TEXT PRIMARY KEY,
      slug TEXT NOT NULL UNIQUE,
      title TEXT NOT NULL,
      status TEXT NOT NULL DEFAULT 'published',
      homepage_id TEXT,
      created_at TEXT NOT NULL,
      updated_at TEXT NOT NULL
    );
  `);

  // 3. page_sections
  db.exec(`
    CREATE TABLE IF NOT EXISTS page_sections (
      id TEXT PRIMARY KEY,
      page_id TEXT NOT NULL,
      section_type TEXT NOT NULL,
      order_index INTEGER NOT NULL DEFAULT 0,
      content_draft_json TEXT NOT NULL,
      content_published_json TEXT NOT NULL,
      styles_json TEXT,
      FOREIGN KEY (page_id) REFERENCES pages (id) ON DELETE CASCADE
    );
  `);

  // Initial Seeding falls DB leer
  seedInitialData(db);
}

function seedInitialData(db: DatabaseSync) {
  const checkPages = db.prepare('SELECT COUNT(*) as count FROM pages').get() as { count: number };
  if (checkPages.count > 0) return;

  const now = new Date().toISOString();

  // Seed site_settings
  const initialSettings = {
    siteName: 'N&D IT Solutions',
    metaDescription: 'High-Performance Webdesign & Digital Solutions - 100% DSGVO-konform.',
    is_demo_mode: false,
    header: {
      brandName: 'N&D',
      brandHighlight: 'i-t SOLUTIONS',
      ctaText: 'Erstgespräch buchen',
      ctaLink: '#contact',
      showThemeToggle: true,
      glassEffect: true
    },
    footer: {
      brandDescription: 'Ihr Partner für professionelles Webdesign, Website-Entwicklung und lokale SEO.',
      copyrightText: 'N&D i-t SOLUTIONS. Alle Rechte vorbehalten.',
      showLegalLinks: true
    },
    site_info: {
      title: 'N&D IT Solutions',
      homepage_id: 'page_home'
    }
  };

  db.prepare('INSERT INTO site_settings (key, value_json, updated_at) VALUES (?, ?, ?)').run(
    'site_config',
    JSON.stringify(initialSettings),
    now
  );

  // Seed default page only (no prefilled sections/demo content)
  db.prepare('INSERT INTO pages (id, slug, title, status, homepage_id, created_at, updated_at) VALUES (?, ?, ?, ?, ?, ?, ?)').run(
    'page_home',
    '/',
    'Startseite',
    'published',
    'page_home',
    now,
    now
  );
}