<?php
declare (strict_types=1);

namespace app\service;

use api\Httpcurl;
use think\facade\Cache;
use think\facade\Log;

class MiniProgramWechatService
{
    private string $miniAppCode;
    private array $miniApp;

    public function __construct(string $miniAppCode, array $miniApp)
    {
        $this->miniAppCode = $miniAppCode;
        $this->miniApp = $miniApp;
    }

    public function openidByLoginCode(string $loginCode, bool $required = false): string
    {
        $config = $this->wechatConfig();
        if ($loginCode === '' || $config['appid'] === '' || $config['secret'] === '') {
            return '';
        }

        $response = Httpcurl::request('https://api.weixin.qq.com/sns/jscode2session', 'get', [
            'appid' => $config['appid'],
            'secret' => $config['secret'],
            'js_code' => $loginCode,
            'grant_type' => 'authorization_code',
        ], [], 8);
        $result = $this->decodeWechatResponse($response, 'miniapi wx code2session');
        if (!empty($result['openid'])) {
            return (string)$result['openid'];
        }

        if ($required) {
            Log::warning('miniapi wx openid missing: ' . json_encode($result, JSON_UNESCAPED_UNICODE));
        }
        return '';
    }

    public function mobileByPhoneCode(string $phoneCode): string
    {
        $accessToken = $this->wechatAccessToken();
        if ($phoneCode === '' || $accessToken === '') {
            return '';
        }

        $response = Httpcurl::request(
            'https://api.weixin.qq.com/wxa/business/getuserphonenumber?access_token=' . urlencode($accessToken),
            'post',
            json_encode(['code' => $phoneCode], JSON_UNESCAPED_UNICODE),
            ['Content-Type: application/json'],
            8
        );
        $result = $this->decodeWechatResponse($response, 'miniapi wx get phone number');
        $phoneInfo = $result['phone_info'] ?? [];
        return (string)($phoneInfo['purePhoneNumber'] ?? $phoneInfo['phoneNumber'] ?? '');
    }

    private function wechatAccessToken(): string
    {
        $config = $this->wechatConfig();
        if ($config['appid'] === '' || $config['secret'] === '') {
            Log::warning('miniapi wx config missing: ' . $this->miniAppCode);
            return '';
        }

        $cacheKey = 'miniapp_access_token_' . $this->miniAppCode;
        $cached = Cache::get($cacheKey);
        if (!empty($cached)) {
            return (string)$cached;
        }

        $response = Httpcurl::request('https://api.weixin.qq.com/cgi-bin/token', 'get', [
            'grant_type' => 'client_credential',
            'appid' => $config['appid'],
            'secret' => $config['secret'],
        ], [], 8);
        $result = $this->decodeWechatResponse($response, 'miniapi wx access token');
        if (empty($result['access_token'])) {
            return '';
        }

        $ttl = max(60, intval($result['expires_in'] ?? 7200) - 300);
        Cache::set($cacheKey, $result['access_token'], $ttl);
        return (string)$result['access_token'];
    }

    private function wechatConfig(): array
    {
        return [
            'appid' => trim((string)($this->miniApp['wechat_appid'] ?? '')),
            'secret' => trim((string)($this->miniApp['wechat_secret'] ?? '')),
        ];
    }

    private function decodeWechatResponse($response, string $scene): array
    {
        $result = $this->decodeResponse($response, $scene);
        if (isset($result['errcode']) && intval($result['errcode']) !== 0) {
            Log::warning($scene . ' failed: ' . json_encode($result, JSON_UNESCAPED_UNICODE));
            return [];
        }

        return $result;
    }

    private function decodeResponse($response, string $scene): array
    {
        if (!is_array($response) || !isset($response[0]) || !empty($response[3])) {
            Log::error($scene . ' request failed: ' . json_encode($response, JSON_UNESCAPED_UNICODE));
            return [];
        }

        $result = json_decode($response[0], true);
        if (!is_array($result)) {
            Log::error($scene . ' response decode failed: ' . $response[0]);
            return [];
        }

        return $result;
    }
}