<?php

namespace App\Service\core;

use App\Models\CodeGenerationModel;
use App\Service\common\UtilsService;
use App\Service\MenuService;
use Exception;
use Illuminate\Http\JsonResponse;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Storage;
use Symfony\Component\HttpFoundation\BinaryFileResponse;

class CodeGenerationService
{
    const TEXT_TYPE = [
        'LONGTEXT',
        'TEXT'
    ];
    const INT_TYPE = [
        'INT',
        'TINYINT',
        'BIGINT',
        'SMALLINT',
        'FLOAT',
    ];
    private static mixed $_instance;

    private ?UtilsService $utils;


    private string $uniqid = '';
    private string $tempDir = '';
    // 大驼峰
    private string $upperCamelCase = '';

    // 小驼峰
    private string $lowerCamelCase = '';

    // 下划线
    private string $underLineCase = '';

    private string $classComment = '';

    // - 连接符
    private string $dashCase = '';
    /**
     * @var string 建表sql语句
     */
    private string $sql = '';
    private array $param = [];
    private string $selectField = '"id"';
    private string $insertField = '';
    private string $updateField = '';
    private string $viewForm = '';
    private string $viewSearch = '';
    private string $searchField = '';
    private string $viewData = '';
    private array $tmpFile = [];

    public function __construct()
    {
        $this->utils = UtilsService::getInstance();
    }

    /**
     * 获取实例
     * @return null|static
     */
    public static function getInstance(): null|static
    {
        $name = get_called_class();
        if (!isset(self::$_instance[$name])) {
            self::$_instance[$name] = new static();
        }

        return self::$_instance[$name];
    }

    public function download($id)
    {
        $model = CodeGenerationModel::find($id);
        if (!$model) {
            $this->utils->errorThrow('文件不存在');
        }
        // 返回下载 $path 文件流
        return response()->download($model['path'], $model['file_name'], ['Content-Type' => 'application/zip']);
    }

    /**
     * 创建临时文件夹，复制模板文件，压缩并返回文件流
     */
    public function downloadUrl()
    {
        try {
            // 将后端模板文件内容写入临时目录中
            $tempFilePath = "{$this->tempDir}/api/{$this->upperCamelCase}Controller.php";
            Storage::put($tempFilePath, $this->tmpFile['server']['controller']);
            $tempFilePath = "{$this->tempDir}/api/{$this->upperCamelCase}Service.php";
            Storage::put($tempFilePath, $this->tmpFile['server']['service']);
            $tempFilePath = "{$this->tempDir}/api/{$this->upperCamelCase}Model.php";
            Storage::put($tempFilePath, $this->tmpFile['server']['model']);

            // 创建ZipService实例
            $zip = new ZipService();
            // 生成压缩文件的路径
            $zipFile = storage_path("/app/public/zip/code-generation/{$this->classComment}-{$this->uniqid}.zip");
            // 被压缩文件夹的路径
            $path = Storage::path($this->tempDir);
            // 执行文件压缩
            $zip->zip($zipFile, $path);

            CodeGenerationModel::create([
                'title' => $this->classComment,
                'file_name' => "{$this->classComment}-{$this->uniqid}.zip",
                'path' => $zipFile,
                'params' => json_encode($this->param),
                'created_at' => time(),
                'updated_at' => time(),
            ]);
            return $zipFile;
        } catch (\Exception $e) {
            return response()->json([
                'error' => '生成模板文件失败',
                'message' => $e->getMessage()
            ], 500);
        }
    }

    private function init()
    {
        // 生成uuid
        $this->uniqid = uniqid();
        // 处理类名、表名
        $this->upperCamelCase = ucfirst($this->param['class_name']);
        $this->lowerCamelCase = lcfirst($this->param['class_name']);
        $this->underLineCase = strtolower(preg_replace('/([A-Z])/', '_$1', $this->param['class_name']));
        $this->dashCase = str_replace('_', '-', $this->underLineCase);
        $this->classComment = $this->param['class_comment'];

        // 生成文件
        // 检查/app/public/zip/code-generation/目录是否存在，如果不存在则创建
        if (!Storage::exists('zip/code-generation')) {
            Storage::makeDirectory('zip/code-generation');
        }

        // 生成唯一的临时目录名
        $this->tempDir = 'temp/templates/' . $this->upperCamelCase . '-' . $this->uniqid;
        Storage::makeDirectory($this->tempDir);
    }

    /**
     * 代码生成主逻辑
     *
     * @param $params
     * @return mixed
     * @throws Exception
     */
    public function generate($params): mixed
    {
        $this->param = $params;
        DB::beginTransaction();
        try {
            // 初始化信息
            $this->init();
            // 生成数据库
            $this->genDatabase();
            // 生成控制器
            $this->genController();
            // 生成服务层
            $this->genService();
            // 生成模型层
            $this->genModel();
            // 生成路由
            $this->genRoute();
            // 执行sql
            $this->querySql();
            // 生成视图
            $this->genViews();
            // 生成菜单
            $this->genMenu();
        } catch (Exception $e) {
            DB::rollBack();
//            ds([
//                'error' => '生成代码失败',
//                'message' => $e->getMessage(),
//                'line' => $e->getLine(),
//                'file' => $e->getFile(),
//            ]);
            $this->utils->errorThrow($e->getMessage());
        }
        return $this->downloadUrl();
    }


    /**
     * 生成 数据库表
     *
     * @return true
     * @throws Exception
     */
    public function genDatabase(): bool
    {
        $tableName = config('database.prefix', 'nl_') . $this->underLineCase;
        // 默认sql语句
        $sql = "CREATE TABLE `{$tableName}` ( `id` int(11) NOT NULL AUTO_INCREMENT COMMENT 'ID', ";

        $sqlTime =
            " `status` tinyint(1) NOT NULL DEFAULT '0' COMMENT '状态 0：正常 1：禁用',"
            . " `created_at` int(11) NOT NULL DEFAULT '0' COMMENT '创建时间',"
            . "`updated_at` int(11) NOT NULL DEFAULT '0' COMMENT '修改时间',"
            . "`deleted_at` int(11) NOT NULL DEFAULT '0' COMMENT '删除时间',";

        $sqlEnd = "PRIMARY KEY (`id`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COMMENT='{$this->classComment}表';";

        foreach ($this->param['field'] as $v) {
            // 处理所需的字段
            $this->checkSelectField($v);

            // 处理备注
            if (empty($v['comment'])) $v['comment'] = "''";

            // 处理是否为空
            $v['null'] = !$v['null'] ? '' : 'NOT';

            // 处理默认值
            if (array_key_exists('default', $v) && isset($v['default'])) {
                $v['default'] = 'DEFAULT ' . "'{$v['default']}'";
            } else {
                $v['default'] = (strpos($v['type'], 'INT') || in_array($v['type'], self::INT_TYPE)) ? 'DEFAULT ' . 0 : 'DEFAULT ' . '\'\'';
            }

            if (in_array($v['type'], self::TEXT_TYPE)) {
                // 编写sql语句
                $sql .= " {$v['name']}  {$v['type']} {$v['null']} NULL COMMENT '{$v['comment']}', ";
            } else {
                // 编写sql语句
                $sql .= " {$v['name']} {$v['type']}({$v['type_number']})  {$v['default']} {$v['null']} NULL COMMENT  '{$v['comment']}', ";
            }
        }

        $this->sql = $sql . $sqlTime . $sqlEnd;

        return true;
    }

    /**
     * 修改api配置文件
     *
     * @return void
     * @throws Exception
     */
    private function genRoute(): void
    {
        $apiPath = app_path('../routes/api.php');
        $apiFile = file_get_contents($apiPath, 'y');
        $newApi =
            "'{$this->dashCase}' => \App\Http\Controllers\Api\CodeGeneration\\{$this->upperCamelCase}Controller::class, // {$this->classComment} \r\n        // 需要登录的路由生成地址";

        $updateNewFile = str_replace('// 需要登录的路由生成地址', $newApi, $apiFile);

        $updateFile = file_put_contents($apiPath, $updateNewFile);
        if (!$updateFile) $this->utils->errorThrow('写入api文件出现了错误');
    }

    /**
     * 生成控制器文件
     * @return void
     */
    private function genController(): void
    {
        $this->strReplaceTmp(
            app_path('template/api/TemplateController.php'),
            app_path("Http/Controllers/Api/CodeGeneration/{$this->upperCamelCase}Controller.php"),
            'server',
            'controller'
        );
    }

    /**
     * 生成服务层文件
     * @return void
     */
    private function genService(): void
    {
        $this->strReplaceTmp(
            app_path('template/api/TemplateService.php'),
            app_path("Service/CodeGeneration/{$this->upperCamelCase}Service.php"),
            'server',
            'service'
        );
    }

    /**
     * 生成模型层文件
     * @return void
     */
    private function genModel(): void
    {
        $this->strReplaceTmp(
            app_path('template/api/TemplateModel.php'),
            app_path("Models/{$this->upperCamelCase}Model.php"),
            'server',
            'model'
        );
    }

    /**
     * 生成前端部分文件
     * @return void
     */
    private function genViews(): void
    {
        $appPath = app_path();
        $viewList = [
            'view-api' => 'api/index.ts',
            'view-modal' => 'components/modal.vue',
            'view-form' => 'config/form.ts',
            'view-search' => 'config/search.ts',
            'view-table' => 'config/table.ts',
            'view-index' => 'index.vue',
        ];
        foreach ($viewList as $k => $v) {
            $this->strReplaceTmp(
                $appPath. '/template/view/' . $v,
                $this->tempDir. "/view/{$this->dashCase}/" . $v,
                'view',
                $k
            );
        }
    }

    /**
     * 生成菜单/授权
     *
     * @return void
     * @throws Exception
     */
    private function genMenu(): void
    {
        MenuService::getInstance()->create([
            'title' => $this->classComment,
            'icon' => $this->param['icon']?? '',
            'name' => $this->upperCamelCase,
            'path' => "/{$this->dashCase}",
            'component' => "/my-gen/{$this->dashCase}/index",
            'pid' => $this->param['pid'],
            'sort' => $this->param['sort'],
        ]);
    }

    /**
     * 模板内容替换
     *
     * @param $template
     * @param $path
     * @param $type
     * @param $fileKey
     * @return void
     */
    private function strReplaceTmp($template, $path, $type, $fileKey): void
    {
        $tmpFile = file_get_contents($template);

        $newFile = str_replace('upperCamelCase', $this->upperCamelCase, $tmpFile);
        $newFile = str_replace('lowerCamelCase', $this->lowerCamelCase, $newFile);
        $newFile = str_replace('dashCase', $this->dashCase, $newFile);
        $newFile = str_replace('模板名称', $this->classComment, $newFile);
        switch ($fileKey) {
            case 'service':
                $newFile = str_replace("'tmpSelectField'", $this->selectField . ', "status", "created_at", "updated_at", "deleted_at"', $newFile);
                $newFile = str_replace("tmpSearchField", $this->searchField . ',status=', $newFile);
                break;
            case 'controller':
                $newFile = str_replace("'temInsertField'", '"' . $this->insertField . '"', $newFile);
                $newFile = str_replace("'temUpdateField'", '"' . $this->updateField . '"', $newFile);
                break;
//            case 'export':
//                $newFile = str_replace("'tmpExportField'", $this->exportField, $newFile);
//                $newFile = str_replace('$row->tmpMapField,', $this->exportFieldRow, $newFile);
//                break;
//            case 'import':
//                $newFile = str_replace("'tmpField'     => \$row['tmpField'],", $this->importField, $newFile);
//                break;
            case 'model':
                $newFile = str_replace('underLineCase', cc_camel_case_to_underscore($this->underLineCase), $newFile);
                break;
            case 'view-form':
                $newFile = str_replace("// 生成的表单字段", "// 生成的表单字段 \r    ". $this->viewForm, $newFile);
                break;
            case 'view-search':
                $newFile = str_replace("// 生成的搜索字段", "// 生成的搜索字段 \r    ". $this->viewSearch, $newFile);
                break;
            case 'view-table':
                $newFile = str_replace("// 生成的列表字段", "// 生成的列表字段 \r    ". $this->viewData, $newFile);
                break;
        }

        $this->tmpFile[$type][$fileKey] = $newFile;
        if (!file_exists($path) && in_array($fileKey, ['controller', 'service', 'model'])) {
            $this->utils->createFile($path);
            file_put_contents($path, $newFile);
        } else {
            Storage::put($path, $newFile);
        }
    }

    /**
     * 设置默认字段
     *
     * @param $item
     * @return void
     */
    private function checkSelectField($item): void
    {
        if (empty($item)) return;
        // 设置列表字段
        if ($item['tableShow']) {
            $this->selectField .= ', "' . $item['name'] . '"';
        }
        // 设置表单字段
        if ($item['formShow']) {
            $isNull = $item['null'] == 1 ? "'required'" : "''";
            $this->insertField .= !empty($this->insertField) ? '","' . $item['name'] : $item['name'];
            $this->updateField .= !empty($this->updateField) ? '","' . $item['name'] : 'id","' . $item['name'];
            $this->viewForm .= "{\n    fieldName: '" . $item['name'] . "',\n      label: '" . $item['comment'] . "',\n      component: '" . $item['formType'] . "',\n      rules: " . $isNull . ",\n  },\n";
        }
        // 设置搜索字段
        if ($item['search']) {
            $this->viewSearch .= "{\n    fieldName: '" . $item['name'] . "',\n      label: '" . $item['comment'] . "',\n      component: '" . $item['formType'] . "',\n  },\n  ";
            $this->searchField .= !empty($this->searchField) ? "','" . $item['name'] . '\' => \'' . $item['searchValue'] : $item['name'] . '\' => \'' . $item['searchValue'];
        }
//        //  设置导出字段
//        $this->exportField .= !empty($this->exportField) ? ',"' . $item['comment'] . '"' : '"' . $item['comment'] . '"';
//        $this->exportFieldRow .= '$row->' . $item['name'] . ",\n            ";
//        // 设置导入字段
//        $this->importField .= "'" . $item['name'] . "'     => \$row['" . $item['comment'] . "'],\n            ";
        // 设置视图数据字段
        $this->viewData .= "{ field: '{$item['name']}', title: '{$item['comment']}' },\n    ";
    }

    /**
     * 执行sql
     *
     * @return void
     * @throws Exception
     */
    private function querySql(): void
    {
        try {
            DB::statement($this->sql);
        } catch (Exception $e) {
            $this->utils->errorThrow($e->getMessage());
        }
    }
}