<?php

namespace App\Services;

use App\Models\SystemConfig;
use Illuminate\Support\Facades\Mail;
use Illuminate\Support\Facades\Cache;

class MailService
{
    /**
     * 发送配对码邮件
     */
    public function sendPairCode(string $email, string $code, int $expireMinutes = 10): bool
    {
        try {
            $config = $this->getMailConfig();

            if (!$config['enabled']) {
                \Log::warning('邮件服务未启用');
                return false;
            }

            $siteName = SystemConfig::getValue('system', 'site_name', 'ERP系统');

            Mail::send([], [], function ($message) use ($email, $code, $expireMinutes, $config, $siteName) {
                $message->to($email)
                    ->from($config['from_email'], $config['from_name'])
                    ->subject("【{$siteName}】异地登录验证 - 配对码")
                    ->html($this->buildPairCodeEmail($code, $expireMinutes, $siteName));
            });

            return true;
        } catch (\Exception $e) {
            \Log::error('发送配对码邮件失败: ' . $e->getMessage());
            return false;
        }
    }

    /**
     * 发送邮箱修改验证码
     */
    public function sendEmailChangeCode(string $newEmail, string $code, string $userName = ''): bool
    {
        try {
            $config = $this->getMailConfig();

            if (!$config['enabled']) {
                \Log::warning('邮件服务未启用');
                return false;
            }

            $siteName = SystemConfig::getValue('system', 'site_name', 'ERP系统');

            Mail::send([], [], function ($message) use ($newEmail, $code, $config, $siteName, $userName) {
                $message->to($newEmail)
                    ->from($config['from_email'], $config['from_name'])
                    ->subject("【{$siteName}】邮箱修改验证码")
                    ->html($this->buildEmailChangeEmail($code, $siteName, $userName));
            });

            return true;
        } catch (\Exception $e) {
            \Log::error('发送邮箱修改验证码邮件失败: ' . $e->getMessage());
            return false;
        }
    }

    /**
     * 发送重置密码邮件
     */
    public function sendResetPasswordCode(string $email, string $code, int $expireMinutes = 30): bool
    {
        try {
            $config = $this->getMailConfig();

            if (!$config['enabled']) {
                \Log::warning('邮件服务未启用');
                return false;
            }

            $siteName = SystemConfig::getValue('system', 'site_name', 'ERP系统');

            Mail::send([], [], function ($message) use ($email, $code, $expireMinutes, $config, $siteName) {
                $message->to($email)
                    ->from($config['from_email'], $config['from_name'])
                    ->subject("【{$siteName}】密码重置验证码")
                    ->html($this->buildResetPasswordEmail($code, $expireMinutes, $siteName));
            });

            return true;
        } catch (\Exception $e) {
            \Log::error('发送重置密码邮件失败: ' . $e->getMessage());
            return false;
        }
    }

    /**
     * 获取邮件配置
     */
    public function getMailConfig(): array
    {
        $cacheKey = 'mail_service_config';

        return Cache::remember($cacheKey, 3600, function () {
            return [
                'enabled' => SystemConfig::getValue('mail', 'enabled', false),
                'driver' => SystemConfig::getValue('mail', 'driver', 'smtp'),
                'host' => SystemConfig::getValue('mail', 'host', ''),
                'port' => (int) SystemConfig::getValue('mail', 'port', 465),
                'encryption' => SystemConfig::getValue('mail', 'encryption', 'ssl'),
                'username' => SystemConfig::getValue('mail', 'username', ''),
                'password' => SystemConfig::getValue('mail', 'password', ''),
                'from_email' => SystemConfig::getValue('mail', 'from_email', 'noreply@erp.local'),
                'from_name' => SystemConfig::getValue('mail', 'from_name', 'ERP系统'),
            ];
        });
    }

    /**
     * 应用邮件配置到 Laravel
     */
    public function applyConfig(): void
    {
        $config = $this->getMailConfig();

        if (!$config['enabled']) {
            return;
        }

        config([
            'mail.default' => $config['driver'],
            'mail.mailers.smtp.host' => $config['host'],
            'mail.mailers.smtp.port' => $config['port'],
            'mail.mailers.smtp.encryption' => $config['encryption'],
            'mail.mailers.smtp.username' => $config['username'],
            'mail.mailers.smtp.password' => $config['password'],
            'mail.from.address' => $config['from_email'],
            'mail.from.name' => $config['from_name'],
        ]);
    }

    /**
     * 测试邮件连接
     */
    public function testConnection(): array
    {
        try {
            $config = $this->getMailConfig();

            if (!$config['enabled']) {
                return ['success' => false, 'message' => '邮件服务未启用'];
            }

            Mail::send([], [], function ($message) use ($config) {
                $message->to($config['from_email'])
                    ->from($config['from_email'], $config['from_name'])
                    ->subject('ERP邮件服务测试')
                    ->text('这是一封测试邮件，证明邮件服务配置正确。');
            });

            return ['success' => true, 'message' => '邮件发送成功'];
        } catch (\Exception $e) {
            return ['success' => false, 'message' => '邮件发送失败: ' . $e->getMessage()];
        }
    }

    /**
     * 构建配对码邮件内容
     */
    private function buildPairCodeEmail(string $code, int $expireMinutes, string $siteName): string
    {
        return <<<HTML
<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <style>
        body { font-family: Arial, sans-serif; background: #f5f5f5; margin: 0; padding: 20px; }
        .container { max-width: 500px; margin: 0 auto; background: #fff; border-radius: 8px; overflow: hidden; box-shadow: 0 2px 8px rgba(0,0,0,0.1); }
        .header { background: #409eff; color: #fff; padding: 24px; text-align: center; }
        .header h1 { margin: 0; font-size: 20px; }
        .content { padding: 32px 24px; }
        .code-box { background: #f8f9fa; border: 2px dashed #409eff; border-radius: 8px; padding: 20px; text-align: center; margin: 20px 0; }
        .code { font-size: 32px; font-weight: bold; letter-spacing: 8px; color: #409eff; }
        .warning { color: #e6a23c; font-size: 14px; margin-top: 16px; }
        .footer { background: #f5f7fa; padding: 16px; text-align: center; font-size: 12px; color: #909399; }
    </style>
</head>
<body>
    <div class="container">
        <div class="header">
            <h1>【{$siteName}】异地登录验证</h1>
        </div>
        <div class="content">
            <p>您好，您在另一台设备尝试登录您的账号。</p>
            <p>以下是您的登录配对码：</p>
            <div class="code-box">
                <div class="code">{$code}</div>
            </div>
            <p class="warning">⚠️ 配对码有效期为 {$expireMinutes} 分钟，请勿告诉他人！</p>
            <p>如果不是您本人操作，请忽略此邮件，并建议您尽快修改密码。</p>
        </div>
        <div class="footer">
            <p>此邮件由系统自动发送，请勿回复。</p>
        </div>
    </div>
</body>
</html>
HTML;
    }

    /**
     * 构建重置密码邮件内容
     */
    private function buildResetPasswordEmail(string $code, int $expireMinutes, string $siteName): string
    {
        return <<<HTML
<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <style>
        body { font-family: Arial, sans-serif; background: #f5f5f5; margin: 0; padding: 20px; }
        .container { max-width: 500px; margin: 0 auto; background: #fff; border-radius: 8px; overflow: hidden; box-shadow: 0 2px 8px rgba(0,0,0,0.1); }
        .header { background: #67c23a; color: #fff; padding: 24px; text-align: center; }
        .header h1 { margin: 0; font-size: 20px; }
        .content { padding: 32px 24px; }
        .code-box { background: #f8f9fa; border: 2px dashed #67c23a; border-radius: 8px; padding: 20px; text-align: center; margin: 20px 0; }
        .code { font-size: 32px; font-weight: bold; letter-spacing: 8px; color: #67c23a; }
        .warning { color: #e6a23c; font-size: 14px; margin-top: 16px; }
        .footer { background: #f5f7fa; padding: 16px; text-align: center; font-size: 12px; color: #909399; }
    </style>
</head>
<body>
    <div class="container">
        <div class="header">
            <h1>【{$siteName}】密码重置验证码</h1>
        </div>
        <div class="content">
            <p>您正在重置账号密码，请使用以下验证码：</p>
            <div class="code-box">
                <div class="code">{$code}</div>
            </div>
            <p class="warning">⚠️ 验证码有效期为 {$expireMinutes} 分钟，请勿告诉他人！</p>
            <p>如果不是您本人操作，请忽略此邮件。</p>
        </div>
        <div class="footer">
            <p>此邮件由系统自动发送，请勿回复。</p>
        </div>
    </div>
</body>
</html>
HTML;
    }

    /**
     * 构建邮箱修改验证码邮件
     */
    private function buildEmailChangeEmail(string $code, string $siteName, string $userName = ''): string
    {
        $greeting = $userName ? "亲爱的 {$userName}" : "您好";
        return <<<HTML
<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <style>
        body { font-family: Arial, sans-serif; background: #f5f5f5; margin: 0; padding: 20px; }
        .container { max-width: 500px; margin: 0 auto; background: #fff; border-radius: 8px; overflow: hidden; box-shadow: 0 2px 8px rgba(0,0,0,0.1); }
        .header { background: #409eff; color: #fff; padding: 24px; text-align: center; }
        .header h1 { margin: 0; font-size: 20px; }
        .content { padding: 32px 24px; }
        .code-box { background: #f8f9fa; border: 2px dashed #409eff; border-radius: 8px; padding: 20px; text-align: center; margin: 20px 0; }
        .code { font-size: 32px; font-weight: bold; letter-spacing: 8px; color: #409eff; }
        .warning { color: #e6a23c; font-size: 14px; margin-top: 16px; }
        .footer { background: #f5f7fa; padding: 16px; text-align: center; font-size: 12px; color: #909399; }
    </style>
</head>
<body>
    <div class="container">
        <div class="header">
            <h1>【{$siteName}】邮箱修改验证码</h1>
        </div>
        <div class="content">
            <p>{$greeting}，您正在修改绑定邮箱，请使用以下验证码：</p>
            <div class="code-box">
                <div class="code">{$code}</div>
            </div>
            <p class="warning">⚠️ 验证码有效期为 30 分钟，请勿告诉他人！</p>
            <p>如果不是您本人操作，请忽略此邮件。</p>
        </div>
        <div class="footer">
            <p>此邮件由系统自动发送，请勿回复。</p>
        </div>
    </div>
</body>
</html>
HTML;
    }
}