const fs = require('fs');
const path = require('path');
const { execSync } = require('child_process');

/**
 * TITAN VAULT v8.0 - GITHUB AUTO-SYNC
 * Uses Environment Variables for stateless authentication.
 */

const VAULT_DIR = path.join(__dirname, '../../vault_archive');

exports.uploadToVault = async (filePath, fileName) => {
  try {
    console.log(`Vault: Preparing to archive ${fileName}...`);
    
    // 1. Ensure Vault Directory Exists
    if (!fs.existsSync(VAULT_DIR)) fs.mkdirSync(VAULT_DIR, { recursive: true });

    // 2. Move file to Vault
    const targetPath = path.join(VAULT_DIR, fileName);
    fs.copyFileSync(filePath, targetPath);

    // 3. Construct Secure Remote URL (Using Env Vars)
    // This prevents the need for manual login on Render
    const username = process.env.GITHUB_USERNAME || 'zhaliejx';
    const token = process.env.GITHUB_TOKEN;
    const repo = 'Codex-'; // Your repository name
    
    if (!token) {
        throw new Error("GITHUB_TOKEN is missing from Environment Variables.");
    }

    const remoteUrl = `https://${username}:${token}@github.com/${username}/${repo}.git`;

    // 4. Execute Git Sync Sequence
    try {
        const rootDir = path.join(__dirname, '../../');
        
        // Define identity flags to prevent "unable to auto-detect email" errors
        const gitIdent = `-c user.name="Codex AI" -c user.email="ai@codex.bot"`;

        // Add, Commit, Push
        execSync(`git add vault_archive/"${fileName}"`, { cwd: rootDir });
        execSync(`git ${gitIdent} commit -m "Vault: Archived ${fileName} [Auto-Sync]"`, { cwd: rootDir });
        
        console.log("Vault: Pushing to remote...");
        if (process.env.SPACE_ID) {
          console.log("Vault: [HF_SPACE_DETECTED] Skipping remote push to prevent restart loop.");
        } else {
          execSync(`git push "${remoteUrl}" main`, { cwd: rootDir });
        }
        
        console.log(`Vault: Sync Complete -> ${process.env.SPACE_ID ? 'Local Archive Only' : 'GitHub'}`);
    } catch (gitErr) {
        console.error('Vault: Git Command Failed:', gitErr.message);
        // We don't throw here to avoid crashing the chat, but we log the error
        return { success: true, link: "Local_Only_Git_Error" }; 
    }

    return {
      success: true,
      link: `https://github.com/${username}/${repo}/blob/main/vault_archive/${fileName}`
    };

  } catch (err) {
    console.error('Vault_System_Failure:', err.message);
    return { success: false, error: err.message };
  }
};