<?php

namespace app\tsf\controller;

use think\Controller;

class Index extends Controller
{
    // ==================== 百度TTS配置（在此处修改）====================
    protected $apiKey = 'XbVUasQ4EQqWv1aWXHPuRI8z';
    protected $secretKey = 'kOG3Cz5juIdyfFsYRP6T1gEdq03ykyGo';
    protected $accessToken = ''; // 留空，系统会自动获取
    // ==================================================================

    protected $tokenCacheKey = 'baidu_tts_access_token';
    protected $tokenExpire = 2592000; // Token有效期30天

    public function index()
    {
        return $this->fetch();
    }

    public function synthesize()
    {
        $data = input('post.');
        
        $text = isset($data['text']) ? trim($data['text']) : '';
        if (empty($text)) {
            return $this->error('文本内容不能为空');
        }

        $params = [
            'tex'      => $text,
            'lan'      => isset($data['lan']) ? $data['lan'] : 'zh',
            'ctp'      => isset($data['ctp']) ? $data['ctp'] : 1,
            'cuid'     => isset($data['cuid']) ? $data['cuid'] : 'php_tts_' . time(),
            'spd'      => isset($data['spd']) ? intval($data['spd']) : 5,
            'pit'      => isset($data['pit']) ? intval($data['pit']) : 5,
            'vol'      => isset($data['vol']) ? intval($data['vol']) : 5,
            'per'      => isset($data['per']) ? intval($data['per']) : 0,
            'aue'      => isset($data['aue']) ? $data['aue'] : 3,
        ];

        $token = $this->getAccessToken();
        if (!$token) {
            return $this->error('获取Access Token失败，请检查API配置');
        }
        $params['tok'] = $token;

        $url = 'https://tsn.baidu.com/text2audio';
        
        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_POST, true);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($params));
        curl_setopt($ch, CURLOPT_TIMEOUT, 30);
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
        curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);
        
        $response = curl_exec($ch);
        $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
        $contentType = curl_getinfo($ch, CURLINFO_CONTENT_TYPE);
        $error = curl_error($ch);
        curl_close($ch);

        if ($error) {
            return $this->error('请求失败: ' . $error);
        }

        if ($httpCode != 200) {
            return $this->error('请求失败，HTTP状态码: ' . $httpCode);
        }

        if (strpos($contentType, 'audio') === false) {
            $result = json_decode($response, true);
            if (isset($result['err_msg'])) {
                return $this->error('TTS合成失败: ' . $result['err_msg']);
            }
            return $this->error('TTS合成失败，未知错误');
        }

        $fileSize = strlen($response);
        $base64Data = base64_encode($response);
        
        $audioFormat = 'mp3';
        if (strpos($contentType, 'mp3') !== false) {
            $audioFormat = 'mp3';
        } elseif (strpos($contentType, 'wav') !== false) {
            $audioFormat = 'wav';
        } elseif (strpos($contentType, 'pcm') !== false) {
            $audioFormat = 'pcm';
        }

        return json([
            'code' => 0,
            'msg' => 'success',
            'data' => [
                'audio_data' => $base64Data,
                'audio_format' => $audioFormat,
                'file_size' => $fileSize,
                'content_type' => $contentType,
            ]
        ]);
    }

    private function getAccessToken()
    {
        if (!empty($this->accessToken)) {
            return $this->accessToken;
        }

        $cachedToken = cache($this->tokenCacheKey);
        if ($cachedToken) {
            return $cachedToken;
        }

        $url = 'https://aip.baidubce.com/oauth/2.0/token';
        $params = [
            'grant_type' => 'client_credentials',
            'client_id' => $this->apiKey,
            'client_secret' => $this->secretKey,
        ];

        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL, $url . '?' . http_build_query($params));
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($ch, CURLOPT_TIMEOUT, 30);
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
        
        $response = curl_exec($ch);
        curl_close($ch);

        $result = json_decode($response, true);
        
        if (isset($result['access_token'])) {
            cache($this->tokenCacheKey, $result['access_token'], $this->tokenExpire);
            return $result['access_token'];
        }

        return false;
    }

    public function clearToken()
    {
        cache($this->tokenCacheKey, null);
        return $this->success('Token已清除，下次请求时会重新获取');
    }
}