<?php
/**
 * Standalone Git Pull Deployment Script for Shared Hosting
 * Location: public/git-pull.php
 */

// Enable full error reporting for debugging
ini_set('display_errors', 1);
ini_set('display_startup_errors', 1);
error_reporting(E_ALL);

define('SECURE_TOKEN', '7f3b89e902a2cdb8b5de9f2e30f14d8a245fca9b');

// Verify token
if (!isset($_GET['token']) || $_GET['token'] !== SECURE_TOKEN) {
    header('HTTP/1.0 403 Forbidden');
    echo "Access Denied: Invalid or missing security token.";
    exit;
}

header('Content-Type: text/plain; charset=utf-8');

echo "=========================================\n";
echo "Starting Git Pull Deployment Workflow\n";
echo "Current Time: " . date('Y-m-d H:i:s') . "\n";
echo "=========================================\n\n";

// Print system diagnostics
echo "System Diagnostics:\n";
echo "PHP Version: " . PHP_VERSION . "\n";
echo "Disabled Functions: " . (ini_get('disable_functions') ?: '(none)') . "\n";
echo "shell_exec status: " . (function_exists('shell_exec') ? 'Enabled' : 'Disabled') . "\n";
echo "exec status: " . (function_exists('exec') ? 'Enabled' : 'Disabled') . "\n";
echo "system status: " . (function_exists('system') ? 'Enabled' : 'Disabled') . "\n";
echo "proc_open status: " . (function_exists('proc_open') ? 'Enabled' : 'Disabled') . "\n";
echo "-----------------------------------------\n\n";

// Robust Git Root Directory Auto-Detection
$targetDir = __DIR__;
for ($i = 0; $i < 4; $i++) {
    if (is_dir($targetDir . '/.git')) {
        break;
    }
    $parent = realpath($targetDir . '/../');
    if (!$parent || $parent === $targetDir) {
        break;
    }
    $targetDir = $parent;
}

if (is_dir($targetDir . '/.git')) {
    chdir($targetDir);
    echo "Git Repository Root Detected: " . getcwd() . "\n\n";
} else {
    chdir(__DIR__);
    echo "Warning: .git directory not found in path hierarchy. Falling back to script directory: " . getcwd() . "\n\n";
}

// Helper function to execute commands with proc_open or standard fallbacks
function execute($cmd) {
    echo "$ {$cmd}\n";
    
    $output = '';
    
    if (function_exists('proc_open')) {
        $descriptorspec = [
            0 => ["pipe", "r"], // stdin
            1 => ["pipe", "w"], // stdout
            2 => ["pipe", "w"]  // stderr
        ];
        
        $process = proc_open($cmd, $descriptorspec, $pipes);
        
        if (is_resource($process)) {
            fclose($pipes[0]);
            
            $stdout = stream_get_contents($pipes[1]);
            fclose($pipes[1]);
            
            $stderr = stream_get_contents($pipes[2]);
            fclose($pipes[2]);
            
            proc_close($process);
            $output = $stdout . $stderr;
        } else {
            $output = "Error: Failed to open process using proc_open.";
        }
    } elseif (function_exists('shell_exec')) {
        $output = shell_exec($cmd);
    } elseif (function_exists('exec')) {
        $outputLines = [];
        exec($cmd, $outputLines);
        $output = implode("\n", $outputLines);
    } elseif (function_exists('system')) {
        ob_start();
        system($cmd);
        $output = ob_get_clean();
    } else {
        echo "Error: No command execution functions (proc_open, shell_exec, exec, system) are enabled on this hosting server.\n";
        echo "-----------------------------------------\n";
        return;
    }
    
    echo $output ? trim($output) : "(no output)";
    echo "\n-----------------------------------------\n";
}

// Check if user is requesting to update the remote origin URL (to embed credentials)
if (isset($_GET['remote'])) {
    $newRemote = $_GET['remote'];
    // Simple verification to prevent command injections
    if (filter_var($newRemote, FILTER_VALIDATE_URL) && (strpos($newRemote, 'https://') === 0 || strpos($newRemote, 'http://') === 0)) {
        echo "Updating git origin remote URL...\n";
        execute("git remote set-url origin " . escapeshellarg($newRemote) . " 2>&1");
    } else {
        echo "Error: Invalid remote URL format. Must start with http:// or https://\n";
        echo "-----------------------------------------\n";
    }
}

// 1. Check current status
execute("git status 2>&1");

// Delete untracked local files that might cause merge conflicts
if (file_exists('git-pull.php')) {
    echo "Cleaning up local untracked git-pull.php root file to prevent conflict...\n";
    @unlink('git-pull.php');
    echo "-----------------------------------------\n";
}

if (file_exists('public/optimize.php')) {
    echo "Cleaning up local untracked public/optimize.php file to prevent conflict...\n";
    @unlink('public/optimize.php');
    echo "-----------------------------------------\n";
}

// Discard any local modifications on the server to prevent pull aborts
execute("git reset --hard HEAD 2>&1");
execute("git clean -fd 2>&1"); // Force clean untracked files and directories

// 2. Pull latest changes
execute("git pull origin main 2>&1");

// 4. Re-optimize Laravel cache and run migrations
$phpBin = PHP_BINARY;
execute("$phpBin artisan optimize:clear 2>&1");
execute("$phpBin artisan migrate --force 2>&1");

if (function_exists('opcache_reset')) {
    opcache_reset();
    echo "PHP OPCache successfully reset.\n";
}

echo "Deployment workflow finished.\n";