<?php

namespace App\Services;

use App\Models\Project;
use Illuminate\Support\Collection;
use Illuminate\Support\Facades\File;
use RuntimeException;
use Symfony\Component\Process\Exception\ProcessFailedException;
use Symfony\Component\Process\Process;

class ProjectService
{
    private string $projectsPath;

    public function __construct(private readonly ConfigService $configService)
    {
        $this->projectsPath = $this->resolveProjectsPath();
    }

    private function resolveProjectsPath(): string
    {
        $path = $this->configService->get('workspace.projects_path');

        if (empty($path)) {
            throw new RuntimeException('configs 表未设置 workspace.projects_path。');
        }

        return rtrim($path, '/');
    }

    /**
     * 获取项目根目录路径
     */
    public function getProjectsPath(): string
    {
        return $this->projectsPath;
    }

    /**
     * 获取所有项目
     */
    public function getAllProjects(): Collection
    {
        return Project::query()->orderBy('name')->get();
    }

    /**
     * 根据 slug 获取项目
     */
    public function getBySlug(string $slug): ?Project
    {
        return Project::findBySlug($slug);
    }

    /**
     * 创建项目
     */
    public function create(array $data): Project
    {
        return Project::query()->create($data);
    }

    /**
     * 更新项目
     */
    public function update(Project $project, array $data): Project
    {
        $project->update($data);
        return $project->refresh();
    }

    /**
     * 删除项目
     */
    public function delete(Project $project): bool
    {
        return $project->delete();
    }

    /**
     * 获取项目状态
     */
    public function getProjectStatus(Project $project): array
    {
        $fullPath = $project->getFullPath($this->projectsPath);
        $pathValid = $project->isPathValid($this->projectsPath);
        $isGitRepo = $pathValid && $project->isGitRepository($this->projectsPath);

        $status = [
            'path_valid' => $pathValid,
            'full_path' => $fullPath,
            'is_git_repo' => $isGitRepo,
            'current_branch' => null,
            'has_uncommitted_changes' => null,
        ];

        if ($isGitRepo) {
            try {
                $status['current_branch'] = $this->getCurrentBranch($fullPath);
                $status['has_uncommitted_changes'] = $this->hasUncommittedChanges($fullPath);
            } catch (\Exception $e) {
                // 忽略 Git 命令错误
            }
        }

        return $status;
    }

    /**
     * 发现新项目（扫描 projects_path 目录）
     */
    public function discoverProjects(): array
    {
        if (!File::exists($this->projectsPath)) {
            return [];
        }

        $existingSlugs = Project::query()->pluck('slug')->toArray();
        $discovered = [];

        $directories = File::directories($this->projectsPath);

        foreach ($directories as $directory) {
            $dirName = basename($directory);

            // 跳过已存在的项目
            if (in_array($dirName, $existingSlugs, true)) {
                continue;
            }

            // 跳过隐藏目录
            if (str_starts_with($dirName, '.')) {
                continue;
            }

            $isGitRepo = is_dir($directory . DIRECTORY_SEPARATOR . '.git');

            $discovered[] = [
                'slug' => $dirName,
                'name' => ucfirst(str_replace(['-', '_'], ' ', $dirName)),
                'directory' => $dirName,
                'path' => $directory,
                'is_git_repo' => $isGitRepo,
            ];
        }

        return $discovered;
    }

    /**
     * 批量添加发现的项目
     */
    public function addDiscoveredProjects(array $slugs): array
    {
        $discovered = $this->discoverProjects();
        $added = [];

        foreach ($discovered as $project) {
            if (in_array($project['slug'], $slugs, true)) {
                $created = Project::query()->create([
                    'slug' => $project['slug'],
                    'name' => $project['name'],
                    'directory' => $project['directory'],
                ]);
                $added[] = $created;
            }
        }

        return $added;
    }

    /**
     * 同步项目的 Git 信息
     */
    public function syncGitInfo(Project $project): Project
    {
        $fullPath = $project->getFullPath($this->projectsPath);

        if (!$project->isGitRepository($this->projectsPath)) {
            return $project;
        }

        try {
            // 获取当前版本（从 version.txt）
            $version = $this->getMasterVersion($fullPath);
            if ($version !== null) {
                $project->git_current_version = $version;
            }

            // 获取当前分支
            $branch = $this->getCurrentBranch($fullPath);
            if ($branch !== null) {
                $project->git_release_branch = $branch;
            }

            $project->git_version_cached_at = now();
            $project->save();
        } catch (\Exception $e) {
            // 忽略错误
        }

        return $project->refresh();
    }

    /**
     * 获取 master 分支的版本号
     */
    private function getMasterVersion(string $path): ?string
    {
        try {
            $this->runGit($path, ['git', 'fetch', 'origin', 'master']);
            $version = $this->runGit($path, ['git', 'show', 'origin/master:version.txt']);
            return trim($version) ?: null;
        } catch (ProcessFailedException $e) {
            return null;
        }
    }

    /**
     * 获取当前分支
     */
    private function getCurrentBranch(string $path): ?string
    {
        try {
            $branch = $this->runGit($path, ['git', 'rev-parse', '--abbrev-ref', 'HEAD']);
            return trim($branch) ?: null;
        } catch (ProcessFailedException $e) {
            return null;
        }
    }

    /**
     * 检查是否有未提交的更改
     */
    private function hasUncommittedChanges(string $path): bool
    {
        try {
            $output = $this->runGit($path, ['git', 'status', '--porcelain']);
            return !empty(trim($output));
        } catch (ProcessFailedException $e) {
            return false;
        }
    }

    /**
     * 运行 Git 命令
     */
    private function runGit(string $cwd, array $command): string
    {
        $process = new Process($command, $cwd);
        $process->setTimeout(60);
        $process->mustRun();

        return $process->getOutput();
    }

    /**
     * 获取所有启用 Git 监控的项目
     */
    public function getGitMonitorEnabledProjects(): Collection
    {
        return Project::getGitMonitorEnabled();
    }

    /**
     * 根据 app 名称查找项目
     */
    public function findByAppName(string $appName): ?Project
    {
        return Project::findByAppName($appName);
    }

    /**
     * 一键同步所有项目的 Git 信息
     */
    public function syncAllGitInfo(): array
    {
        $projects = $this->getAllProjects();
        $synced = [];
        $failed = [];

        foreach ($projects as $project) {
            try {
                if ($project->isGitRepository($this->projectsPath)) {
                    $this->syncGitInfo($project);
                    $synced[] = $project->slug;
                }
            } catch (\Exception $e) {
                $failed[] = [
                    'slug' => $project->slug,
                    'error' => $e->getMessage(),
                ];
            }
        }

        return [
            'synced' => $synced,
            'failed' => $failed,
        ];
    }
}