<?php

namespace App\Services;

use Illuminate\Support\Facades\File;
use Illuminate\Support\Facades\Log;
use RuntimeException;
use Symfony\Component\Process\Process;

class ChannelProjectService
{
    /**
     * Run tools/new_project.py to materialize public/web/{channelId}/.
     * Domains come from config (系统设置 / env); script rebuilds sync only when domains changed.
     *
     * Panel hosts often set open_basedir to server/ only — do not probe lab-root
     * paths with is_file(); the Python child process is not bound by open_basedir.
     */
    public function generate(string $channelId): void
    {
        $channelId = strtolower(trim($channelId));
        if (! preg_match('/^[a-z0-9]{32}$/', $channelId)) {
            throw new RuntimeException('Invalid channel id');
        }

        $domains = array_values(array_filter(config('coruna.channel_domains', [])));
        if ($domains === []) {
            throw new RuntimeException('投放域名未配置（系统设置 → 投放域名）');
        }

        $labRoot = dirname(base_path()); // coruna-lab/
        $script = $this->resolveNewProjectScript($labRoot);
        $python = $this->resolvePythonBin();

        $joined = implode(',', $domains);
        $cmd = [
            $python,
            $script,
            '--channel-id',
            $channelId,
            '--deployment-domains',
            $joined,
            '--reporting-domains',
            $joined,
        ];

        // cwd must stay inside open_basedir (server/). Script resolves LAB_ROOT from __file__.
        $process = new Process($cmd, base_path());
        $process->setTimeout(600);
        $process->run();

        if (! $process->isSuccessful()) {
            Log::error('new_project failed', [
                'channel_id' => $channelId,
                'out' => $process->getOutput(),
                'err' => $process->getErrorOutput(),
            ]);
            $this->deleteWebTree($channelId);
            throw new RuntimeException(
                '生成渠道资源失败: '.trim($process->getErrorOutput() ?: $process->getOutput() ?: 'unknown')
            );
        }
    }

    public function deleteWebTree(string $channelId): void
    {
        $channelId = strtolower(trim($channelId));
        if (! preg_match('/^[a-z0-9]{32}$/', $channelId)) {
            return;
        }
        $dir = public_path('web/'.$channelId);
        if (is_dir($dir)) {
            File::deleteDirectory($dir);
        }
    }

    private function resolveNewProjectScript(string $labRoot): string
    {
        $configured = trim((string) config('coruna.new_project_py', ''));
        if ($configured !== '') {
            return $configured;
        }

        return $labRoot.'/tools/new_project.py';
    }

    /**
     * Prefer an absolute python path so the child process gets a non-empty sys.executable.
     */
    private function resolvePythonBin(): string
    {
        $configured = trim((string) config('coruna.python_bin', 'python3'));
        if ($configured === '') {
            $configured = 'python3';
        }
        if (str_contains($configured, '/')) {
            return $configured;
        }

        $which = trim((string) shell_exec('command -v '.escapeshellarg($configured).' 2>/dev/null'));
        if ($which !== '' && ! str_contains($which, "\n")) {
            return $which;
        }

        foreach (['/usr/bin/python3', '/usr/local/bin/python3'] as $fallback) {
            if (@is_file($fallback)) {
                return $fallback;
            }
        }

        return $configured;
    }
}