StellarSplit/backend/src/export/email.service.ts at main · ghzhost/StellarSplit · GitHub

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import { Injectable, Logger } from "@nestjs/common";
import { ConfigService } from "@nestjs/config";
import * as nodemailer from "nodemailer";
import { ExportFormat, ReportType } from "./entities/export-job.entity";

@Injectable()
export class EmailService {
  private readonly logger = new Logger(EmailService.name);

  // Initialised directly in the constructor so TypeScript can verify
  // definite assignment — avoids TS2564 without needing `!`
  private readonly transporter: nodemailer.Transporter;

  constructor(private readonly configService: ConfigService) {
    this.transporter = nodemailer.createTransport({
      host: this.configService.get<string>("SMTP_HOST"),
      port: parseInt(this.configService.get<string>("SMTP_PORT") ?? "587", 10),
      secure: this.configService.get<string>("SMTP_SECURE") === "true",
      auth: {
        user: this.configService.get<string>("SMTP_USER"),
        pass: this.configService.get<string>("SMTP_PASSWORD"),
      },
    });
  }

  async sendExportEmail(
    to: string,
    fileName: string,
    downloadUrl: string,
    format: ExportFormat,
    reportType: ReportType,
    expiresAt: Date,
  ): Promise<void> {
    const formatNames: Record<ExportFormat, string> = {
      [ExportFormat.CSV]: "CSV",
      [ExportFormat.PDF]: "PDF",
      [ExportFormat.JSON]: "JSON",
      [ExportFormat.QBO]: "QuickBooks",
      [ExportFormat.OFX]: "OFX",
      [ExportFormat.XLSX]: "Excel",
    };

    const reportNames: Record<ReportType, string> = {
      [ReportType.MONTHLY_SUMMARY]: "Monthly Summary",
      [ReportType.ANNUAL_TAX_REPORT]: "Annual Tax Report",
      [ReportType.CATEGORY_BREAKDOWN]: "Category Breakdown",
      [ReportType.PARTNER_WISE_SUMMARY]: "Partner-wise Summary",
      [ReportType.PAYMENT_HISTORY]: "Payment History",
      [ReportType.CUSTOM]: "Custom Report",
    };

    const subject = `Your ${reportNames[reportType]} Export from StellarSplit`;

    const html = `
<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Export Ready</title>
    <style>
        body { font-family: Arial, sans-serif; line-height: 1.6; color: #333; max-width: 600px; margin: 0 auto; padding: 20px; }
        .header { background-color: #4F46E5; color: white; padding: 20px; text-align: center; border-radius: 5px 5px 0 0; }
        .content { background-color: #f9f9f9; padding: 30px; border-radius: 0 0 5px 5px; }
        .button { display: inline-block; padding: 12px 24px; background-color: #4F46E5; color: white; text-decoration: none; border-radius: 5px; font-weight: bold; margin: 20px 0; }
        .footer { margin-top: 30px; padding-top: 20px; border-top: 1px solid #eee; font-size: 12px; color: #666; }
        .details { background-color: white; padding: 15px; border-radius: 5px; margin: 20px 0; border-left: 4px solid #4F46E5; }
        .details dt { font-weight: bold; margin-top: 10px; }
        .details dd { margin-left: 0; margin-bottom: 10px; }
    </style>
</head>
<body>
    <div class="header"><h1>📊 Your Export is Ready!</h1></div>
    <div class="content">
        <p>Hello,</p>
        <p>Your expense report export has been generated and is ready for download.</p>
        <div class="details">
            <dl>
                <dt>Report Type:</dt><dd>${reportNames[reportType]}</dd>
                <dt>File Format:</dt><dd>${formatNames[format]}</dd>
                <dt>File Name:</dt><dd>${fileName}</dd>
                <dt>Generated At:</dt><dd>${new Date().toLocaleString()}</dd>
            </dl>
        </div>
        <p><a href="${downloadUrl}" class="button">Open Export</a></p>
        <p><strong>Important:</strong> This export will expire on ${expiresAt.toLocaleString()}.</p>
        <p>If you did not request this export, please contact our support team.</p>
        <div class="footer">
            <p>Best regards,<br>The StellarSplit Team</p>
            <p><small>Need help? Contact <a href="mailto:support@stellarsplit.com">support@stellarsplit.com</a></small></p>
        </div>
    </div>
</body>
</html>`;

    const text = `
Your Export is Ready!

Report Type: ${reportNames[reportType]}
File Format: ${formatNames[format]}
File Name: ${fileName}
Generated At: ${new Date().toLocaleString()}

Open export: ${downloadUrl}

This export expires at ${expiresAt.toLocaleString()}.

Best regards,
The StellarSplit Team
support@stellarsplit.com`;

    try {
      await this.transporter.sendMail({
        from:
          this.configService.get<string>("EMAIL_FROM") ??
          "exports@stellarsplit.com",
        to,
        subject,
        text,
        html,
      });
      this.logger.log(`Export email sent to ${to}`);
    } catch (error) {
      this.logger.error(`Failed to send export email:`, error);
      throw error;
    }
  }

  async sendScheduledReportEmail(
    recipients: string[],
    fileName: string,
    fileUrl: string,
    _templateName: string,
  ): Promise<void> {
    for (const recipient of recipients) {
      await this.sendExportEmail(
        recipient,
        fileName,
        fileUrl,
        ExportFormat.PDF,
        ReportType.MONTHLY_SUMMARY,
        new Date(Date.now() + 7 * 24 * 60 * 60 * 1000),
      );
    }
  }
}