// BetterCurseForge — Preload Script
// ==================================
// Injected into every BrowserWindow's preload phase.
// Chain-loads the original CurseForge preload, then injects the renderer runtime.
// Since contextIsolation is false, we have direct access to the renderer's JS context.

const { ipcRenderer } = require('electron');
const path = require('path');
const fs = require('fs');

// ── Find and load original preload ────────────────────────────

const args = process.argv;
let originalPreloadPath = null;

for (const arg of args) {
  if (arg.startsWith('--bcf-original-preload=')) {
    originalPreloadPath = arg.split('=')[1];
    break;
  }
}

if (originalPreloadPath && fs.existsSync(originalPreloadPath)) {
  try {
    require(originalPreloadPath);
    console.log('[BetterCF] Original preload loaded:', originalPreloadPath);
  } catch (err) {
    console.error('[BetterCF] Failed to load original preload:', err);
  }
}

// ── Inject Renderer Runtime ───────────────────────────────────

const bcfInjected = args.some(a => a === '--bcf-injected=true');

if (bcfInjected) {
  // Wait for DOM to be ready, then inject our renderer
  const injectRenderer = () => {
    const bcfCorePath = path.join(__dirname, 'bettercf', 'core');
    const rendererPath = path.join(bcfCorePath, 'renderer.js');

    if (!fs.existsSync(rendererPath)) {
      console.warn('[BetterCF] renderer.js not found at', rendererPath);
      return;
    }

    // Read renderer code and inject via inline script
    // CSP allows 'unsafe-inline' so this works
    const rendererCode = fs.readFileSync(rendererPath, 'utf-8');

    // Create the BetterCurseForge API on the window object
    // This needs to bridge to the main process via IPC
    const apiSetup = `
      window.__BCF_IPC__ = {
        invoke: (...args) => require('electron').ipcRenderer.invoke(...args),
      };
      window.__BCF_PRELOAD_PATH__ = ${JSON.stringify(bcfCorePath)};
    `;

    // Inject API setup immediately
    const apiScript = document.createElement('script');
    apiScript.textContent = apiSetup;
    (document.head || document.documentElement).appendChild(apiScript);

    // Inject renderer after a short delay to ensure DOM is ready
    const rendererScript = document.createElement('script');
    rendererScript.type = 'module';
    rendererScript.textContent = rendererCode;
    (document.head || document.documentElement).appendChild(rendererScript);

    console.log('[BetterCF] Renderer injected.');
  };

  if (document.readyState === 'loading') {
    document.addEventListener('DOMContentLoaded', injectRenderer);
  } else {
    injectRenderer();
  }
}