/**
 * Email Templates Service
 *
 * Renders email templates using MJML and Handlebars
 */

import { Injectable } from '@nestjs/common';
import mjml2html from 'mjml';
import Handlebars from 'handlebars';

@Injectable()
export class EmailTemplates {
  /**
   * Render booking confirmation email
   */
  async renderBookingConfirmation(data: {
    bookingNumber: string;
    bookingDetails: any;
  }): Promise<string> {
    const mjmlTemplate = `
      <mjml>
        <mj-head>
          <mj-attributes>
            <mj-all font-family="'Helvetica Neue', Helvetica, Arial, sans-serif" />
            <mj-text font-size="14px" color="#333333" line-height="1.6" />
          </mj-attributes>
        </mj-head>
        <mj-body background-color="#f4f4f4">
          <mj-section background-color="#ffffff" padding="20px">
            <mj-column>
              <mj-text font-size="24px" font-weight="bold" color="#0066cc">
                Booking Confirmation
              </mj-text>
              <mj-divider border-color="#0066cc" />
              <mj-text font-size="16px">
                Your booking has been confirmed successfully!
              </mj-text>
              <mj-text>
                <strong>Booking Number:</strong> {{bookingNumber}}
              </mj-text>
              <mj-text>
                Thank you for using Xpeditis. Your booking confirmation is attached as a PDF.
              </mj-text>
              <mj-button background-color="#0066cc" href="{{dashboardUrl}}">
                View in Dashboard
              </mj-button>
            </mj-column>
          </mj-section>
          <mj-section background-color="#f4f4f4" padding="10px">
            <mj-column>
              <mj-text font-size="12px" color="#666666" align="center">
                © 2025 Xpeditis. All rights reserved.
              </mj-text>
            </mj-column>
          </mj-section>
        </mj-body>
      </mjml>
    `;

    const { html } = mjml2html(mjmlTemplate);
    const template = Handlebars.compile(html);
    return template(data);
  }

  /**
   * Render verification email
   */
  async renderVerificationEmail(data: { verifyUrl: string }): Promise<string> {
    const mjmlTemplate = `
      <mjml>
        <mj-head>
          <mj-attributes>
            <mj-all font-family="'Helvetica Neue', Helvetica, Arial, sans-serif" />
          </mj-attributes>
        </mj-head>
        <mj-body background-color="#f4f4f4">
          <mj-section background-color="#ffffff" padding="20px">
            <mj-column>
              <mj-text font-size="24px" font-weight="bold" color="#0066cc">
                Verify Your Email
              </mj-text>
              <mj-divider border-color="#0066cc" />
              <mj-text>
                Welcome to Xpeditis! Please verify your email address to get started.
              </mj-text>
              <mj-button background-color="#0066cc" href="{{verifyUrl}}">
                Verify Email Address
              </mj-button>
              <mj-text font-size="12px" color="#666666">
                If you didn't create an account, you can safely ignore this email.
              </mj-text>
            </mj-column>
          </mj-section>
          <mj-section background-color="#f4f4f4" padding="10px">
            <mj-column>
              <mj-text font-size="12px" color="#666666" align="center">
                © 2025 Xpeditis. All rights reserved.
              </mj-text>
            </mj-column>
          </mj-section>
        </mj-body>
      </mjml>
    `;

    const { html } = mjml2html(mjmlTemplate);
    const template = Handlebars.compile(html);
    return template(data);
  }

  /**
   * Render password reset email
   */
  async renderPasswordResetEmail(data: { resetUrl: string }): Promise<string> {
    const mjmlTemplate = `
      <mjml>
        <mj-head>
          <mj-attributes>
            <mj-all font-family="'Helvetica Neue', Helvetica, Arial, sans-serif" />
          </mj-attributes>
        </mj-head>
        <mj-body background-color="#f4f4f4">
          <mj-section background-color="#ffffff" padding="20px">
            <mj-column>
              <mj-text font-size="24px" font-weight="bold" color="#0066cc">
                Reset Your Password
              </mj-text>
              <mj-divider border-color="#0066cc" />
              <mj-text>
                You requested to reset your password. Click the button below to set a new password.
              </mj-text>
              <mj-button background-color="#0066cc" href="{{resetUrl}}">
                Reset Password
              </mj-button>
              <mj-text font-size="12px" color="#666666">
                This link will expire in 1 hour. If you didn't request this, please ignore this email.
              </mj-text>
            </mj-column>
          </mj-section>
          <mj-section background-color="#f4f4f4" padding="10px">
            <mj-column>
              <mj-text font-size="12px" color="#666666" align="center">
                © 2025 Xpeditis. All rights reserved.
              </mj-text>
            </mj-column>
          </mj-section>
        </mj-body>
      </mjml>
    `;

    const { html } = mjml2html(mjmlTemplate);
    const template = Handlebars.compile(html);
    return template(data);
  }

  /**
   * Render welcome email
   */
  async renderWelcomeEmail(data: { firstName: string; dashboardUrl: string }): Promise<string> {
    const mjmlTemplate = `
      <mjml>
        <mj-head>
          <mj-attributes>
            <mj-all font-family="'Helvetica Neue', Helvetica, Arial, sans-serif" />
          </mj-attributes>
        </mj-head>
        <mj-body background-color="#f4f4f4">
          <mj-section background-color="#ffffff" padding="20px">
            <mj-column>
              <mj-text font-size="24px" font-weight="bold" color="#0066cc">
                Welcome to Xpeditis, {{firstName}}!
              </mj-text>
              <mj-divider border-color="#0066cc" />
              <mj-text>
                We're excited to have you on board. Xpeditis helps you search and book maritime freight with ease.
              </mj-text>
              <mj-text>
                <strong>Get started:</strong>
              </mj-text>
              <mj-text>
                • Search for shipping rates<br/>
                • Compare carriers and prices<br/>
                • Book containers online<br/>
                • Track your shipments
              </mj-text>
              <mj-button background-color="#0066cc" href="{{dashboardUrl}}">
                Go to Dashboard
              </mj-button>
            </mj-column>
          </mj-section>
          <mj-section background-color="#f4f4f4" padding="10px">
            <mj-column>
              <mj-text font-size="12px" color="#666666" align="center">
                © 2025 Xpeditis. All rights reserved.
              </mj-text>
            </mj-column>
          </mj-section>
        </mj-body>
      </mjml>
    `;

    const { html } = mjml2html(mjmlTemplate);
    const template = Handlebars.compile(html);
    return template(data);
  }

  /**
   * Render user invitation email
   */
  async renderUserInvitation(data: {
    organizationName: string;
    inviterName: string;
    tempPassword: string;
    loginUrl: string;
  }): Promise<string> {
    const mjmlTemplate = `
      <mjml>
        <mj-head>
          <mj-attributes>
            <mj-all font-family="'Helvetica Neue', Helvetica, Arial, sans-serif" />
          </mj-attributes>
        </mj-head>
        <mj-body background-color="#f4f4f4">
          <mj-section background-color="#ffffff" padding="20px">
            <mj-column>
              <mj-text font-size="24px" font-weight="bold" color="#0066cc">
                You've Been Invited!
              </mj-text>
              <mj-divider border-color="#0066cc" />
              <mj-text>
                {{inviterName}} has invited you to join <strong>{{organizationName}}</strong> on Xpeditis.
              </mj-text>
              <mj-text>
                <strong>Your temporary password:</strong> {{tempPassword}}
              </mj-text>
              <mj-text font-size="12px" color="#ff6600">
                Please change your password after your first login.
              </mj-text>
              <mj-button background-color="#0066cc" href="{{loginUrl}}">
                Login Now
              </mj-button>
            </mj-column>
          </mj-section>
          <mj-section background-color="#f4f4f4" padding="10px">
            <mj-column>
              <mj-text font-size="12px" color="#666666" align="center">
                © 2025 Xpeditis. All rights reserved.
              </mj-text>
            </mj-column>
          </mj-section>
        </mj-body>
      </mjml>
    `;

    const { html } = mjml2html(mjmlTemplate);
    const template = Handlebars.compile(html);
    return template(data);
  }

  /**
   * Render CSV booking request email
   */
  async renderCsvBookingRequest(data: {
    bookingId: string;
    bookingNumber?: string;
    documentPassword?: string;
    origin: string;
    destination: string;
    volumeCBM: number;
    weightKG: number;
    palletCount: number;
    priceUSD: number;
    priceEUR: number;
    primaryCurrency: string;
    transitDays: number;
    containerType: string;
    documents: Array<{
      type: string;
      fileName: string;
    }>;
    acceptUrl: string;
    rejectUrl: string;
  }): Promise<string> {
    // Register Handlebars helper for equality check
    Handlebars.registerHelper('eq', function (a, b) {
      return a === b;
    });

    const htmlTemplate = `
      <!DOCTYPE html>
      <html lang="fr">
      <head>
        <meta charset="UTF-8">
        <meta name="viewport" content="width=device-width, initial-scale=1.0">
        <title>Nouvelle demande de réservation</title>
        <style>
          body {
            margin: 0;
            padding: 0;
            font-family: 'Arial', 'Helvetica', sans-serif;
            background-color: #f4f6f8;
            color: #333;
          }
          .container {
            max-width: 600px;
            margin: 20px auto;
            background-color: #ffffff;
            border-radius: 8px;
            overflow: hidden;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
          }
          .header {
            background: linear-gradient(135deg, #045a8d, #00bcd4);
            color: #ffffff;
            padding: 30px 20px;
            text-align: center;
          }
          .header h1 {
            margin: 0;
            font-size: 28px;
            font-weight: 700;
          }
          .header p {
            margin: 5px 0 0;
            font-size: 14px;
            opacity: 0.9;
          }
          .content {
            padding: 30px 20px;
          }
          .section-title {
            font-size: 20px;
            font-weight: 700;
            color: #045a8d;
            margin-bottom: 15px;
            border-bottom: 2px solid #00bcd4;
            padding-bottom: 8px;
          }
          .details-table {
            width: 100%;
            margin: 20px 0;
            border-collapse: collapse;
          }
          .details-table td {
            padding: 12px 10px;
            border-bottom: 1px solid #e0e0e0;
          }
          .details-table td:first-child {
            font-weight: 700;
            color: #045a8d;
            width: 40%;
          }
          .details-table td:last-child {
            color: #333;
          }
          .price-highlight {
            font-size: 24px;
            font-weight: 700;
            color: #00aa00;
          }
          .price-secondary {
            font-size: 14px;
            color: #666;
          }
          .documents-section {
            background-color: #f9f9f9;
            padding: 20px;
            border-radius: 6px;
            margin: 20px 0;
          }
          .documents-section ul {
            list-style: none;
            padding: 0;
            margin: 10px 0 0;
          }
          .documents-section li {
            padding: 8px 0;
            font-size: 14px;
          }
          .documents-section li:before {
            content: '📄 ';
            margin-right: 8px;
          }
          .action-buttons {
            text-align: center;
            margin: 30px 0;
          }
          .action-buttons p {
            font-size: 16px;
            font-weight: 700;
            margin-bottom: 15px;
          }
          .button-container {
            display: flex;
            justify-content: space-around;
            gap: 15px;
            flex-wrap: wrap;
          }
          .btn {
            display: inline-block;
            padding: 15px 30px;
            font-size: 16px;
            font-weight: 700;
            text-decoration: none;
            border-radius: 6px;
            color: #ffffff;
            text-align: center;
            min-width: 200px;
          }
          .btn-accept {
            background-color: #00aa00;
          }
          .btn-accept:hover {
            background-color: #008800;
          }
          .btn-reject {
            background-color: #cc0000;
          }
          .btn-reject:hover {
            background-color: #aa0000;
          }
          .important-notice {
            background-color: #fff8e1;
            border-left: 4px solid #f57c00;
            padding: 15px;
            margin: 20px 0;
            border-radius: 4px;
          }
          .important-notice p {
            margin: 0;
            font-size: 14px;
            color: #666;
          }
          .important-notice strong {
            color: #f57c00;
          }
          .footer {
            background-color: #f4f6f8;
            padding: 20px;
            text-align: center;
            font-size: 12px;
            color: #666;
          }
          .footer p {
            margin: 5px 0;
          }
          .booking-reference {
            font-size: 14px;
            font-weight: 700;
            color: #045a8d;
          }
          @media only screen and (max-width: 600px) {
            .container {
              margin: 10px;
              border-radius: 0;
            }
            .header h1 {
              font-size: 22px;
            }
            .button-container {
              flex-direction: column;
            }
            .btn {
              width: 100%;
              margin: 5px 0;
            }
          }
        </style>
      </head>
      <body>
        <div class="container">
          <!-- Header -->
          <div class="header">
            <h1>🚢 Nouvelle demande de réservation</h1>
            <p>Xpeditis</p>
          </div>

          <!-- Content -->
          <div class="content">
            <p style="font-size: 16px; margin-bottom: 20px;">
              Bonjour,
            </p>
            <p style="font-size: 14px; line-height: 1.6; margin-bottom: 20px;">
              Vous avez reçu une nouvelle demande de réservation via Xpeditis. Veuillez examiner les détails ci-dessous et confirmer ou refuser cette demande.
            </p>

            {{#if bookingNumber}}
            <!-- Booking Reference Box -->
            <div style="background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%); border: 2px solid #0284c7; border-radius: 8px; padding: 20px; margin: 20px 0; text-align: center;">
              <p style="margin: 0 0 10px 0; font-size: 14px; color: #0369a1;">Numéro de devis</p>
              <p style="margin: 0; font-size: 28px; font-weight: bold; color: #0c4a6e; letter-spacing: 2px;">{{bookingNumber}}</p>
              {{#if documentPassword}}
              <div style="margin-top: 15px; padding-top: 15px; border-top: 1px solid #bae6fd;">
                <p style="margin: 0 0 5px 0; font-size: 12px; color: #0369a1;">🔐 Mot de passe pour accéder aux documents</p>
                <p style="margin: 0; font-size: 20px; font-weight: bold; color: #0c4a6e; background: white; display: inline-block; padding: 8px 16px; border-radius: 4px; letter-spacing: 3px;">{{documentPassword}}</p>
                <p style="margin: 10px 0 0 0; font-size: 11px; color: #64748b;">Conservez ce mot de passe, il vous sera demandé pour télécharger les documents</p>
              </div>
              {{/if}}
            </div>
            {{/if}}

            <!-- Booking Details -->
            <div class="section-title">📋 Détails du transport</div>
            <table class="details-table">
              <tr>
                <td>Route</td>
                <td>{{origin}} → {{destination}}</td>
              </tr>
              <tr>
                <td>Volume</td>
                <td>{{volumeCBM}} CBM</td>
              </tr>
              <tr>
                <td>Poids</td>
                <td>{{weightKG}} kg</td>
              </tr>
              <tr>
                <td>Palettes</td>
                <td>{{palletCount}}</td>
              </tr>
              <tr>
                <td>Type de conteneur</td>
                <td>{{containerType}}</td>
              </tr>
              <tr>
                <td>Transit</td>
                <td>{{transitDays}} jours</td>
              </tr>
              <tr>
                <td>Prix</td>
                <td>
                  <span class="price-highlight">
                    {{#if (eq primaryCurrency "EUR")}}
                      {{priceEUR}} EUR
                    {{else}}
                      {{priceUSD}} USD
                    {{/if}}
                  </span>
                  <br>
                  <span class="price-secondary">
                    {{#if (eq primaryCurrency "EUR")}}
                      (≈ {{priceUSD}} USD)
                    {{else}}
                      (≈ {{priceEUR}} EUR)
                    {{/if}}
                  </span>
                </td>
              </tr>
            </table>

            <!-- Documents Section -->
            <div class="documents-section">
              <div class="section-title">📄 Documents fournis</div>
              <ul>
                {{#each documents}}
                  <li><strong>{{this.type}}:</strong> {{this.fileName}}</li>
                {{/each}}
              </ul>
            </div>

            <!-- Action Buttons -->
            <div class="action-buttons">
              <p>Veuillez confirmer votre décision :</p>
              <div class="button-container">
                <a href="{{acceptUrl}}" class="btn btn-accept">✓ Accepter la demande</a>
                <a href="{{rejectUrl}}" class="btn btn-reject">✗ Refuser la demande</a>
              </div>
            </div>

            <!-- Important Notice -->
            <div class="important-notice">
              <p>
                <strong>⚠️ Important</strong><br>
                Cette demande expire automatiquement dans <strong>7 jours</strong> si aucune action n'est prise. Merci de répondre dans les meilleurs délais.
              </p>
            </div>
          </div>

          <!-- Footer -->
          <div class="footer">
            <p class="booking-reference">Référence de réservation : {{bookingId}}</p>
            <p>© 2025 Xpeditis. Tous droits réservés.</p>
            <p>Cet email a été envoyé automatiquement. Merci de ne pas y répondre directement.</p>
          </div>
        </div>
      </body>
      </html>
    `;

    const template = Handlebars.compile(htmlTemplate);
    return template(data);
  }

  /**
   * Render invitation email with registration link
   */
  async renderInvitationWithToken(data: {
    firstName: string;
    lastName: string;
    organizationName: string;
    inviterName: string;
    invitationLink: string;
    expiresAt: string;
  }): Promise<string> {
    const mjmlTemplate = `
      <mjml>
        <mj-head>
          <mj-attributes>
            <mj-all font-family="'Helvetica Neue', Helvetica, Arial, sans-serif" />
          </mj-attributes>
        </mj-head>
        <mj-body background-color="#f4f4f4">
          <mj-section background-color="#ffffff" padding="40px 20px">
            <mj-column>
              <mj-text font-size="28px" font-weight="bold" color="#0066cc" align="center">
                🚢 Bienvenue sur Xpeditis !
              </mj-text>
              <mj-divider border-color="#0066cc" border-width="3px" padding="20px 0" />

              <mj-text font-size="16px" line-height="1.8">
                Bonjour <strong>{{firstName}} {{lastName}}</strong>,
              </mj-text>

              <mj-text font-size="16px" line-height="1.8">
                {{inviterName}} vous invite à rejoindre <strong>{{organizationName}}</strong> sur la plateforme Xpeditis.
              </mj-text>

              <mj-text font-size="15px" color="#666666" line-height="1.6">
                Xpeditis est la solution complète pour gérer vos expéditions maritimes en ligne. Recherchez des tarifs, réservez des containers et suivez vos envois en temps réel.
              </mj-text>

              <mj-spacer height="30px" />

              <mj-button
                background-color="#0066cc"
                href="{{invitationLink}}"
                font-size="16px"
                font-weight="bold"
                border-radius="5px"
                padding="15px 40px"
              >
                Créer mon compte
              </mj-button>

              <mj-spacer height="20px" />

              <mj-text font-size="13px" color="#999999" align="center">
                Ou copiez ce lien dans votre navigateur:
              </mj-text>
              <mj-text font-size="12px" color="#0066cc" align="center">
                {{invitationLink}}
              </mj-text>
            </mj-column>
          </mj-section>

          <mj-section background-color="#fff8e1" padding="20px">
            <mj-column>
              <mj-text font-size="14px" color="#f57c00" font-weight="bold">
                ⏱️ Cette invitation expire le {{expiresAt}}
              </mj-text>
              <mj-text font-size="13px" color="#666666">
                Créez votre compte avant cette date pour rejoindre votre organisation.
              </mj-text>
            </mj-column>
          </mj-section>

          <mj-section background-color="#f4f4f4" padding="20px">
            <mj-column>
              <mj-text font-size="12px" color="#666666" align="center">
                © 2025 Xpeditis. Tous droits réservés.
              </mj-text>
              <mj-text font-size="11px" color="#999999" align="center">
                Si vous n'avez pas sollicité cette invitation, vous pouvez ignorer cet email.
              </mj-text>
            </mj-column>
          </mj-section>
        </mj-body>
      </mjml>
    `;

    const { html } = mjml2html(mjmlTemplate);
    const template = Handlebars.compile(html);
    return template(data);
  }
}