# All files / modules/email/services email.service.ts

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     import { Injectable, Logger, OnModuleInit } from '@nestjs/common';
    import { ConfigService } from '@nestjs/config';
    import { SendEmailDto, SendTemplateEmailDto, EmailAddressDto, AttachmentDto } from '../dto';

    export type EmailProvider = 'sendgrid' | 'ses' | 'smtp';

    export interface EmailResult {
      success: boolean;
      messageId?: string;
      provider: EmailProvider;
      error?: string;
    }

    interface SendGridAttachment {
      content: string;
      filename: string;
      type?: string;
      disposition?: string;
    }

    interface SendGridPersonalization {
      to: { email: string; name?: string }[];
      cc?: { email: string; name?: string }[];
      bcc?: { email: string; name?: string }[];
    }

    interface SendGridMessage {
      personalizations: SendGridPersonalization[];
      from: { email: string; name?: string };
      reply_to?: { email: string; name?: string };
      subject: string;
      content: { type: string; value: string }[];
      attachments?: SendGridAttachment[];
    }

    @Injectable()
    export class EmailService implements OnModuleInit {
      private readonly logger = new Logger(EmailService.name);
      private provider: EmailProvider;
      private isConfigured = false;

      // SendGrid
      private sendgridApiKey: string;

      // AWS SES
      private sesRegion: string;
      private sesAccessKeyId: string;
      private sesSecretAccessKey: string;

      // SMTP
      private smtpHost: string;
      private smtpPort: number;
      private smtpUser: string;
      private smtpPassword: string;
      private smtpSecure: boolean;

      // Common
      private fromEmail: string;
      private fromName: string;
      private replyTo: string;

      constructor(private configService: ConfigService) {}

      onModuleInit() {
        const emailConfig = this.configService.get('email');

        this.provider = emailConfig?.provider || 'sendgrid';
        this.fromEmail = emailConfig?.from || 'noreply@example.com';
        this.fromName = emailConfig?.fromName || 'Template SaaS';
        this.replyTo = emailConfig?.replyTo || '';

        // SendGrid config
        this.sendgridApiKey = emailConfig?.sendgridApiKey || '';

        // AWS SES config
        this.sesRegion = emailConfig?.sesRegion || 'us-east-1';
        this.sesAccessKeyId = emailConfig?.sesAccessKeyId || '';
        this.sesSecretAccessKey = emailConfig?.sesSecretAccessKey || '';

        // SMTP config
        this.smtpHost = emailConfig?.smtpHost || '';
        this.smtpPort = emailConfig?.smtpPort || 587;
        this.smtpUser = emailConfig?.smtpUser || '';
        this.smtpPassword = emailConfig?.smtpPassword || '';
        this.smtpSecure = emailConfig?.smtpSecure || false;

        // Check if configured
        this.isConfigured = this.checkConfiguration();

        if (this.isConfigured) {
          this.logger.log(`Email service initialized with provider: ${this.provider}`);
        } else {
          this.logger.warn('Email service not configured - emails will be logged only');
        }
      }

      private checkConfiguration(): boolean {
        switch (this.provider) {
          case 'sendgrid':
            return !!this.sendgridApiKey;
          case 'ses':
            return !!(this.sesAccessKeyId && this.sesSecretAccessKey);
          case 'smtp':
            return !!(this.smtpHost && this.smtpUser && this.smtpPassword);
          default:
            return false;
        }
      }

      async sendEmail(dto: SendEmailDto): Promise<EmailResult> {
        this.logger.debug(`Sending email to ${dto.to.email}: ${dto.subject}`);

        if (!this.isConfigured) {
          this.logger.warn('Email not configured, logging email instead');
          this.logEmail(dto);
          return {
            success: true,
            messageId: `mock-${Date.now()}`,
            provider: this.provider,
          };
        }

        try {
          switch (this.provider) {
            case 'sendgrid':
              return await this.sendViaSendGrid(dto);
            case 'ses':
              return await this.sendViaSES(dto);
            case 'smtp':
              return await this.sendViaSMTP(dto);
            default:
              throw new Error(`Unknown email provider: ${this.provider}`);
          }
        } catch (error) {
          this.logger.error(`Failed to send email: ${error.message}`, error.stack);
          return {
            success: false,
            provider: this.provider,
            error: error.message,
          };
        }
      }

      async sendTemplateEmail(dto: SendTemplateEmailDto): Promise<EmailResult> {
        // TODO: Integrate with notification_templates table
        // For now, we'll use a simple template rendering approach
        const { templateKey, variables, ...emailData } = dto;

        const template = await this.getTemplate(templateKey);
        if (!template) {
          return {
            success: false,
            provider: this.provider,
            error: `Template not found: ${templateKey}`,
          };
        }

        const renderedSubject = this.renderTemplate(template.subject, variables || {});
        const renderedHtml = this.renderTemplate(template.html, variables || {});
        const renderedText = template.text
          ? this.renderTemplate(template.text, variables || {})
          : undefined;

        return this.sendEmail({
          ...emailData,
          subject: renderedSubject,
          html: renderedHtml,
          text: renderedText,
        });
      }

      async sendBulkEmails(emails: SendEmailDto[]): Promise<EmailResult[]> {
        const results: EmailResult[] = [];

        // Process in batches of 10
        const batchSize = 10;
        for (let i = 0; i < emails.length; i += batchSize) {
          const batch = emails.slice(i, i + batchSize);
          const batchResults = await Promise.all(
            batch.map((email) => this.sendEmail(email)),
          );
          results.push(...batchResults);
        }

        return results;
      }

      // SendGrid implementation
      private async sendViaSendGrid(dto: SendEmailDto): Promise<EmailResult> {
        const message: SendGridMessage = {
          personalizations: [
            {
              to: [{ email: dto.to.email, name: dto.to.name }],
              ...(dto.cc?.length && {
                cc: dto.cc.map((c) => ({ email: c.email, name: c.name })),
              }),
              ...(dto.bcc?.length && {
                bcc: dto.bcc.map((b) => ({ email: b.email, name: b.name })),
              }),
            },
          ],
          from: { email: this.fromEmail, name: this.fromName },
          ...(this.replyTo && { reply_to: { email: this.replyTo } }),
          subject: dto.subject,
          content: [],
        };

        if (dto.text) {
          message.content.push({ type: 'text/plain', value: dto.text });
        }
        if (dto.html) {
          message.content.push({ type: 'text/html', value: dto.html });
        }

        if (dto.attachments?.length) {
          message.attachments = dto.attachments.map((a) => ({
            content: a.content,
            filename: a.filename,
            type: a.contentType,
            disposition: 'attachment',
          }));
        }

        const response = await fetch('https://api.sendgrid.com/v3/mail/send', {
          method: 'POST',
          headers: {
            'Authorization': `Bearer ${this.sendgridApiKey}`,
            'Content-Type': 'application/json',
          },
          body: JSON.stringify(message),
        });

        if (!response.ok) {
          const errorBody = await response.text();
          throw new Error(`SendGrid error: ${response.status} - ${errorBody}`);
        }

        const messageId = response.headers.get('x-message-id') || `sg-${Date.now()}`;

        return {
          success: true,
          messageId,
          provider: 'sendgrid',
        };
      }

      // AWS SES implementation using AWS SDK v3 pattern (fetch-based)
      private async sendViaSES(dto: SendEmailDto): Promise<EmailResult> {
        // Using AWS SES v2 API via HTTPS
        const endpoint = `https://email.${this.sesRegion}.amazonaws.com/v2/email/outbound-emails`;

        const body = {
          FromEmailAddress: `${this.fromName} <${this.fromEmail}>`,
          Destination: {
            ToAddresses: [`${dto.to.name || ''} <${dto.to.email}>`],
            ...(dto.cc?.length && {
              CcAddresses: dto.cc.map((c) => `${c.name || ''} <${c.email}>`),
            }),
            ...(dto.bcc?.length && {
              BccAddresses: dto.bcc.map((b) => `${b.name || ''} <${b.email}>`),
            }),
          },
          Content: {
            Simple: {
              Subject: { Data: dto.subject },
              Body: {
                ...(dto.text && { Text: { Data: dto.text } }),
                ...(dto.html && { Html: { Data: dto.html } }),
              },
            },
          },
          ...(this.replyTo && { ReplyToAddresses: [this.replyTo] }),
        };

        // AWS Signature V4 signing would be needed here
        // For production, use @aws-sdk/client-sesv2
        // This is a simplified implementation
        const timestamp = new Date().toISOString().replace(/[:-]|\.\d{3}/g, '');
        const date = timestamp.slice(0, 8);

        const headers = {
          'Content-Type': 'application/json',
          'X-Amz-Date': timestamp,
          'Host': `email.${this.sesRegion}.amazonaws.com`,
        };

        // Note: In production, implement proper AWS Signature V4 signing
        // or use @aws-sdk/client-sesv2
        this.logger.warn('AWS SES: Using simplified implementation - consider using @aws-sdk/client-sesv2');

        const response = await fetch(endpoint, {
          method: 'POST',
          headers: {
            ...headers,
            // AWS credentials would need proper signature
            'X-Amz-Security-Token': '', // Add if using temporary credentials
          },
          body: JSON.stringify(body),
        });

        Iif (!response.ok) {
          const errorBody = await response.text();
          throw new Error(`SES error: ${response.status} - ${errorBody}`);
        }

        const result = await response.json();

        return {
          success: true,
          messageId: result.MessageId || `ses-${Date.now()}`,
          provider: 'ses',
        };
      }

      // SMTP implementation using nodemailer-compatible approach
      private async sendViaSMTP(dto: SendEmailDto): Promise<EmailResult> {
        // For SMTP, we need nodemailer - this is a placeholder
        // In production, install nodemailer and use it here
        this.logger.warn('SMTP: Requires nodemailer package - install with: npm install nodemailer');

        // Fallback to logging
        this.logEmail(dto);

        return {
          success: true,
          messageId: `smtp-${Date.now()}`,
          provider: 'smtp',
        };
      }

      // Template handling
      private async getTemplate(
        templateKey: string,
      ): Promise<{ subject: string; html: string; text?: string } | null> {
        // TODO: Fetch from notification_templates table
        // For now, return built-in templates
        const templates: Record<string, { subject: string; html: string; text?: string }> = {
          welcome: {
            subject: 'Welcome to {{appName}}!',
            html: `
              <h1>Welcome, {{userName}}!</h1>
              <p>Thank you for joining {{appName}}. We're excited to have you on board.</p>
              <p>Get started by exploring our features.</p>
              <p>Best regards,<br/>The {{appName}} Team</p>
            `,
            text: 'Welcome, {{userName}}! Thank you for joining {{appName}}.',
          },
          password_reset: {
            subject: 'Reset your password - {{appName}}',
            html: `
              <h1>Password Reset Request</h1>
              <p>Hi {{userName}},</p>
              <p>We received a request to reset your password. Click the link below to proceed:</p>
              <p><a href="{{resetLink}}">Reset Password</a></p>
              <p>This link expires in {{expiresIn}}.</p>
              <p>If you didn't request this, please ignore this email.</p>
            `,
            text: 'Hi {{userName}}, Reset your password here: {{resetLink}}',
          },
          invitation: {
            subject: "You've been invited to {{tenantName}}",
            html: `
              <h1>You're Invited!</h1>
              <p>{{inviterName}} has invited you to join {{tenantName}} on {{appName}}.</p>
              <p><a href="{{inviteLink}}">Accept Invitation</a></p>
              <p>This invitation expires in {{expiresIn}}.</p>
            `,
            text: "You've been invited to {{tenantName}}. Accept here: {{inviteLink}}",
          },
          notification: {
            subject: '{{title}}',
            html: `
              <h2>{{title}}</h2>
              <p>{{message}}</p>
              {{#if actionUrl}}
              <p><a href="{{actionUrl}}">{{actionText}}</a></p>
              {{/if}}
            `,
            text: '{{title}}: {{message}}',
          },
        };

        return templates[templateKey] || null;
      }

      private renderTemplate(
        template: string,
        variables: Record<string, any>,
      ): string {
        let result = template;

        // Simple variable replacement: {{variableName}}
        for (const [key, value] of Object.entries(variables)) {
          const regex = new RegExp(`\\{\\{${key}\\}\\}`, 'g');
          result = result.replace(regex, String(value ?? ''));
        }

        // Handle conditional blocks: {{#if condition}}...{{/if}}
        result = result.replace(
          /\{\{#if\s+(\w+)\}\}([\s\S]*?)\{\{\/if\}\}/g,
          (_, condition, content) => {
            return variables[condition] ? content : '';
          },
        );

        return result;
      }

      private logEmail(dto: SendEmailDto): void {
        this.logger.log('=== EMAIL (NOT SENT - NO PROVIDER CONFIGURED) ===');
        this.logger.log(`To: ${dto.to.email}`);
        Iif (dto.cc?.length) {
          this.logger.log(`CC: ${dto.cc.map((c) => c.email).join(', ')}`);
        }
        Iif (dto.bcc?.length) {
          this.logger.log(`BCC: ${dto.bcc.map((b) => b.email).join(', ')}`);
        }
        this.logger.log(`Subject: ${dto.subject}`);
        this.logger.log(`Body (text): ${dto.text?.substring(0, 200) || '(none)'}`);
        this.logger.log(`Body (html): ${dto.html?.substring(0, 200) || '(none)'}`);
        this.logger.log('================================================');
      }

      // Utility methods
      isEnabled(): boolean {
        return this.isConfigured;
      }

      getProvider(): EmailProvider {
        return this.provider;
      }
    }