<?php

namespace App\Console\Commands;

use Illuminate\Console\Command;
use Illuminate\Support\Facades\File;
use Illuminate\Support\Facades\Process;

class UpdateNNTmuxGit extends Command
{
    /**
     * The name and signature of the console command.
     *
     * @var string
     */
    protected $signature = 'nntmux:git
                            {--branch= : Specific branch to checkout}
                            {--no-stash : Skip stashing local changes}
                            {--force : Force pull even if there are conflicts}';

    /**
     * The console command description.
     *
     * @var string
     */
    protected $description = 'Update NNTmux from git repository with improved error handling';

    /**
     * Create a new command instance.
     */
    public function __construct()
    {
        parent::__construct();
    }

    /**
     * Execute the console command.
     */
    public function handle(): int
    {
        try {
            $this->info('🔄 Starting git update process...');

            // Check if we're in a git repository
            if (! $this->isGitRepository()) {
                $this->error('Not in a git repository');

                return Command::FAILURE;
            }

            // Check for uncommitted changes
            if ($this->hasUncommittedChanges() && ! $this->option('no-stash')) {
                $this->info('📦 Stashing local changes...');
                $this->stashChanges();
            }

            // Get current branch
            $currentBranch = $this->getCurrentBranch();
            $targetBranch = $this->option('branch') ?? $currentBranch;

            // Fetch latest changes
            $this->info('📡 Fetching latest changes...');
            $this->fetchChanges();

            // Check if update is needed
            if (! $this->option('force') && ! $this->isUpdateNeeded($targetBranch)) {
                $this->info('✅ Already up-to-date');

                return Command::SUCCESS;
            }

            // Perform the update
            $this->info("🔄 Updating to latest $targetBranch...");
            $this->pullChanges($targetBranch);

            $this->info('✅ Git update completed successfully');

            return Command::SUCCESS;

        } catch (\Exception $e) {
            $this->error('❌ Git update failed: '.$e->getMessage());

            return Command::FAILURE;
        }
    }

    /**
     * Check if current directory is a git repository
     */
    private function isGitRepository(): bool
    {
        return File::exists(base_path('.git'));
    }

    /**
     * Check if there are uncommitted changes
     */
    private function hasUncommittedChanges(): bool
    {
        $process = Process::run('git status --porcelain');

        return ! empty(trim($process->output()));
    }

    /**
     * Stash uncommitted changes
     */
    private function stashChanges(): void
    {
        $process = Process::run('git stash push -m "Auto-stash before update on '.now()->toDateTimeString().'"');

        if (! $process->successful()) {
            throw new \Exception('Failed to stash changes: '.$process->errorOutput());
        }

        $this->line('  ✓ Changes stashed successfully');
    }

    /**
     * Get current git branch
     */
    private function getCurrentBranch(): string
    {
        $process = Process::run('git branch --show-current');

        if (! $process->successful()) {
            throw new \Exception('Failed to get current branch: '.$process->errorOutput());
        }

        return trim($process->output());
    }

    /**
     * Fetch latest changes from remote
     */
    private function fetchChanges(): void
    {
        $process = Process::timeout(300)->run('git fetch --prune');

        if (! $process->successful()) {
            throw new \Exception('Failed to fetch changes: '.$process->errorOutput());
        }
    }

    /**
     * Check if update is needed
     */
    private function isUpdateNeeded(string $branch): bool
    {
        $process = Process::run("git rev-list HEAD...origin/$branch --count");

        if (! $process->successful()) {
            // If we can't check, assume update is needed
            return true;
        }

        return (int) trim($process->output()) > 0;
    }

    /**
     * Pull changes from remote
     */
    private function pullChanges(string $branch): void
    {
        $pullCommand = $this->option('force')
            ? "git reset --hard origin/$branch"
            : "git pull origin $branch";

        $process = Process::timeout(300)->run($pullCommand);

        if (! $process->successful()) {
            throw new \Exception('Failed to pull changes: '.$process->errorOutput());
        }

        $this->line('  ✓ Changes pulled successfully');
    }
}