/* =====================================================================
   db.js — SQLite-Datenbank (better-sqlite3), Ersatz für Cloudflare D1.
   Führt beim ersten Start alle vier Migrationen aus ../cloudflare-worker/migrations/
   in der ursprünglichen Reihenfolge aus (0001 Basis-Schema, 0002 app_settings,
   0003 Supporter-Abo, 0004 TikTok/Discord-Spalten) — anders als bei VanVans Shop
   ist hier NIE alles in einer konsolidierten schema.sql zusammengefasst worden,
   deshalb müssen wir hier tatsächlich alle vier der Reihe nach anwenden.
   ===================================================================== */

import Database from "better-sqlite3";
import { readFileSync, existsSync, mkdirSync } from "node:fs";
import { dirname, join } from "node:path";
import { fileURLToPath } from "node:url";

const __dirname = dirname(fileURLToPath(import.meta.url));
const DB_PATH = process.env.DB_PATH || "/var/lib/dogfather-internal/dogfather-internal.db";
const MIGRATIONS_DIR = join(__dirname, "..", "cloudflare-worker", "migrations");

mkdirSync(dirname(DB_PATH), { recursive: true });

export const db = new Database(DB_PATH);
db.pragma("journal_mode = WAL");
db.pragma("foreign_keys = ON");

const MIGRATION_FILES = [
  "0001_init.sql",
  "0002_app_settings.sql",
  "0003_supporter_abo.sql",
  "0004_supporter_oauth_providers.sql",
];

function alreadyApplied(name) {
  const row = db.prepare(`SELECT 1 FROM _migrations WHERE name = ?`).get(name);
  return !!row;
}

export function initDb() {
  db.exec(`CREATE TABLE IF NOT EXISTS _migrations (name TEXT PRIMARY KEY, applied_at TEXT NOT NULL)`);
  for (const file of MIGRATION_FILES) {
    if (alreadyApplied(file)) continue;
    const path = join(MIGRATIONS_DIR, file);
    if (!existsSync(path)) {
      console.warn(`⚠️  Migration ${file} nicht gefunden unter ${path}, übersprungen.`);
      continue;
    }
    const sql = readFileSync(path, "utf-8");
    db.exec(sql);
    db.prepare(`INSERT INTO _migrations (name, applied_at) VALUES (?, ?)`).run(file, new Date().toISOString());
    console.log(`Migration angewendet: ${file}`);
  }
}