<?php

namespace app\controllers;

use app\models\Share;
use app\models\ShareSearch;
use Yii;
use yii\web\Controller;
use yii\web\ForbiddenHttpException;
use yii\web\NotFoundHttpException;
use yii\filters\VerbFilter;
use yii\web\Response;

/**
 * ShareController implements the CRUD actions for Share model.
 */
class ShareController extends Controller
{
    /**
     * @inheritDoc
     */
    public function behaviors()
    {
        return array_merge(
            parent::behaviors(),
            [
                'verbs' => [
                    'class' => VerbFilter::className(),
                    'actions' => [
                        'delete' => ['POST'],
                    ],
                ],
            ]
        );
    }

    /**
     * Lists all Share models.
     *
     * @return string
     */
    public function actionIndex()
    {
        $searchModel = new ShareSearch();
        $dataProvider = $searchModel->search($this->request->queryParams);

        return $this->render('index', [
            'searchModel' => $searchModel,
            'dataProvider' => $dataProvider,
        ]);
    }

    /**
     * Displays a single Share model.
     * @param int $share_id Share ID
     * @return string
     * @throws NotFoundHttpException if the model cannot be found
     */
    public function actionView($share_id)
    {
        return $this->render('view', [
            'model' => $this->findModel($share_id),
        ]);
    }

    /**
     * Creates a new Share model.
     * If creation is successful, the browser will be redirected to the 'view' page.
     * @return string|Response
     */
    public function actionCreate(): Response|string
    {
        $model = new Share();

        if ($this->request->isPost) {
            if ($model->load($this->request->post())) {
                //对access_code进行检测
                if (empty($model->access_code) || !preg_match('/^[a-zA-Z0-9]{4}$/', $model->access_code)) {
                    Yii::$app->session->setFlash('error', '访问密码必须是4位字母和数字的组合');
                    return $this->render('create', ['model' => $model]);
                }

                //对file_relative_path进行检测
                $absolutePath = Yii::getAlias(Yii::$app->params['dataDirectory']) . '/' . Yii::$app->user->id . '/' . $model->file_relative_path;
                if (!file_exists($absolutePath)) {
                    Yii::$app->session->setFlash('error', '文件或文件夹不存在');
                    return $this->render('create', ['model' => $model]);
                }

                $model->access_code = strtolower($model->access_code);
                $model->sharer_id = Yii::$app->user->id;  // 自动设置 sharer_id 为当前用户的 ID
                if ($model->save()) {
                    return $this->redirect(['view', 'share_id' => $model->share_id]);
                }
            }
        } else {
            $model->loadDefaultValues();
        }

        return $this->render('create', [
            'model' => $model,
        ]);
    }

    /**
     * Updates an existing Share model.
     * If update is successful, the browser will be redirected to the 'view' page.
     * @param int $share_id Share ID
     * @return string|Response
     * @throws NotFoundHttpException if the model cannot be found
     */
    public function actionUpdate($share_id)
    {
        $model = $this->findModel($share_id);
        $model->scenario = Share::SCENARIO_UPDATE;  // 设置模型为 'update' 场景

        if ($this->request->isPost) {
            $postData = $this->request->post();
            if (isset($postData['Share']['access_code'])) {  // 只加载 'access_code' 字段
                $model->access_code = $postData['Share']['access_code'];
                if ($model->save()) {
                    return $this->redirect(['view', 'share_id' => $model->share_id]);
                }
            }
        }

        return $this->render('update', [
            'model' => $model,
        ]);
    }

    /**
     * Deletes an existing Share model.
     * If deletion is successful, the browser will be redirected to the 'index' page.
     * @param int $share_id Share ID
     * @return Response
     * @throws NotFoundHttpException if the model cannot be found
     */
    public function actionDelete($share_id)
    {
        $this->findModel($share_id)->delete();

        return $this->redirect(['index']);
    }

    /**
     * Finds the Share model based on its primary key value.
     * If the model is not found, a 404 HTTP exception will be thrown.
     * @param int $share_id Share ID
     * @return Share the loaded model
     * @throws NotFoundHttpException if the model cannot be found
     */
    protected function findModel($share_id)
    {
        if (($model = Share::findOne(['share_id' => $share_id])) !== null) {
            return $model;
        }

        throw new NotFoundHttpException('The requested page does not exist.');
    }

    public function actionAccess($share_id, $access_code = null)
    {
        if ($this->request->isPost) {
            $model = $this->findModel($share_id);
            $access_code = $this->request->post('Share')['access_code'];
            if ($access_code === $model->access_code) {
                // 访问密码正确，显示文件信息和下载按钮
                $access_granted = Yii::$app->session->get('access_granted', []);
                $access_granted[$share_id] = true;
                Yii::$app->session->set('access_granted', $access_granted);  // 将访问权限信息存储到 session 中
                $absolutePath = Yii::getAlias(Yii::$app->params['dataDirectory']) . '/' . $model->sharer_id . '/' . $model->file_relative_path;
                $isDirectory = is_dir($absolutePath);
                $sharerUsername = $model->getSharerUsername();
                return $this->render('_file_info', [
                    'model' => $model,
                    'isDirectory' => $isDirectory,
                    'sharerUsername' => $sharerUsername,
                ]);
            } else {
                Yii::$app->session->setFlash('error', '访问密码错误');
            }
        }
        $model = new Share();
        $model->access_code = $access_code;

        return $this->render('access', [
            'model' => $model,
        ]);
    }

    /**
     * @throws ForbiddenHttpException
     * @throws NotFoundHttpException
     */
    public function actionDownload($share_id)
    {
        $access_granted = Yii::$app->session->get('access_granted', []);
        if (!isset($access_granted[$share_id]) || !$access_granted[$share_id]) {
            throw new \yii\web\ForbiddenHttpException('你没有权限下载这个文件');
        }

        $model = $this->findModel($share_id);

        $absolutePath = Yii::getAlias(Yii::$app->params['dataDirectory']) . '/' . $model->sharer_id . '/' . $model->file_relative_path;
        if (is_file($absolutePath)) {
            return Yii::$app->response->sendFile($absolutePath);
        } else if (is_dir($absolutePath)) {
            // 如果是文件夹，压缩后发送
            $zipPath = $absolutePath . '.zip';
            $zip = new \ZipArchive();
            $zip->open($zipPath, \ZipArchive::CREATE | \ZipArchive::OVERWRITE);
            $files = new \RecursiveIteratorIterator(new \RecursiveDirectoryIterator($absolutePath));
            foreach ($files as $file) {
                if (!$file->isDir()) {
                    $filePath = $file->getRealPath();
                    $relativePath = substr($filePath, strlen($absolutePath) + 1);
                    $zip->addFile($filePath, $relativePath);
                }
            }
            $zip->close();
            return Yii::$app->response->sendFile($zipPath);
        }else{
            throw new NotFoundHttpException('异常，文件不存在');
        }
    }
}