import { Resend } from "resend"

const resend = process.env.RESEND_API_KEY ? new Resend(process.env.RESEND_API_KEY) : null

interface EmailUser {
  name: string
  email: string
  username: string
  memberId: string
  department: string
}

interface WelcomeEmailData extends EmailUser {
  password: string
  loginUrl: string
}

interface StatusChangeEmailData extends EmailUser {
  status: "verified" | "rejected" | "pending"
  loginUrl: string
}

interface VotingReminderEmailData extends EmailUser {
  eventTitle: string
  eventEndDate: string
  votingUrl: string
}

export class EmailService {
  private isDevelopment = process.env.NODE_ENV === "development"
  private fromEmail = process.env.RESEND_FROM_EMAIL || "onboarding@resend.dev"
  private baseUrl = process.env.NEXT_PUBLIC_BASE_URL || "http://localhost:3000"

  async sendWelcomeEmail(data: WelcomeEmailData): Promise<boolean> {
    try {
      // Only attempt to send email if RESEND_API_KEY is configured
      if (!process.env.RESEND_API_KEY || !resend) {
        console.log("RESEND_API_KEY not configured, skipping email send")
        return true // Return success to not block user creation
      }

      const { data: result, error } = await resend.emails.send({
        from: this.fromEmail,
        to: [data.email],
        subject: "Selamat Datang di Platform E-Voting METI",
        html: this.getWelcomeEmailTemplate(data),
      })

      if (error) {
        console.error("Error sending welcome email:", error)
        // Don't block user creation if email fails
        return true
      }

      console.log("Welcome email sent successfully:", result?.id)
      return true
    } catch (error) {
      console.error("Failed to send welcome email:", error)
      // Return true to not block user creation in development
      return true
    }
  }

  async sendStatusChangeEmail(data: StatusChangeEmailData): Promise<boolean> {
    try {
      // Only attempt to send email if RESEND_API_KEY is configured
      if (!process.env.RESEND_API_KEY || !resend) {
        console.log("RESEND_API_KEY not configured, skipping email send")
        return true // Return success to not block user creation
      }

      const subject = this.getStatusEmailSubject(data.status)

      const { data: result, error } = await resend.emails.send({
        from: this.fromEmail,
        to: [data.email],
        subject,
        html: this.getStatusChangeEmailTemplate(data),
      })

      if (error) {
        console.error("Error sending status change email:", error)
        // Don't block user creation if email fails
        return true
      }

      console.log("Status change email sent successfully:", result?.id)
      return true
    } catch (error) {
      console.error("Failed to send status change email:", error)
      // Return true to not block user creation in development
      return true
    }
  }

  async sendVotingReminderEmail(data: VotingReminderEmailData): Promise<boolean> {
    try {
      // Only attempt to send email if RESEND_API_KEY is configured
      if (!process.env.RESEND_API_KEY || !resend) {
        console.log("RESEND_API_KEY not configured, skipping email send")
        return true // Return success to not block user creation
      }

      const { data: result, error } = await resend.emails.send({
        from: this.fromEmail,
        to: [data.email],
        subject: `Reminder: Voting ${data.eventTitle} - METI`,
        html: this.getVotingReminderEmailTemplate(data),
      })

      if (error) {
        console.error("Error sending voting reminder email:", error)
        // Don't block user creation if email fails
        return true
      }

      console.log("Voting reminder email sent successfully:", result?.id)
      return true
    } catch (error) {
      console.error("Failed to send voting reminder email:", error)
      // Return true to not block user creation in development
      return true
    }
  }

  private getStatusEmailSubject(status: string): string {
    switch (status) {
      case "verified":
        return "Akun Anda Telah Diverifikasi - METI E-Voting"
      case "rejected":
        return "Status Verifikasi Akun - METI E-Voting"
      case "pending":
        return "Status Akun Ditangguhkan - METI E-Voting"
      default:
        return "Update Status Akun - METI E-Voting"
    }
  }

  private getWelcomeEmailTemplate(data: WelcomeEmailData): string {
    return `
    <!DOCTYPE html>
    <html lang="id">
    <head>
        <meta charset="UTF-8">
        <meta name="viewport" content="width=device-width, initial-scale=1.0">
        <title>Selamat Datang di METI E-Voting</title>
        <style>
            body { font-family: Arial, sans-serif; line-height: 1.6; color: #333; max-width: 600px; margin: 0 auto; padding: 20px; }
            .header { background: linear-gradient(135deg, #1e40af 0%, #3b82f6 100%); color: white; padding: 30px; text-align: center; border-radius: 10px 10px 0 0; }
            .logo { font-size: 24px; font-weight: bold; margin-bottom: 10px; }
            .content { background: #f8fafc; padding: 30px; border-radius: 0 0 10px 10px; }
            .credentials-box { background: white; border: 2px solid #e2e8f0; border-radius: 8px; padding: 20px; margin: 20px 0; }
            .credential-item { display: flex; justify-content: space-between; margin: 10px 0; padding: 10px; background: #f1f5f9; border-radius: 5px; }
            .credential-label { font-weight: bold; color: #475569; }
            .credential-value { font-family: monospace; background: #1e293b; color: #f1f5f9; padding: 4px 8px; border-radius: 4px; }
            .button { display: inline-block; background: #1e40af; color: white; padding: 12px 24px; text-decoration: none; border-radius: 6px; margin: 20px 0; font-weight: bold; }
            .button:hover { background: #1d4ed8; }
            .warning { background: #fef3c7; border: 1px solid #f59e0b; padding: 15px; border-radius: 6px; margin: 20px 0; }
            .footer { text-align: center; margin-top: 30px; padding-top: 20px; border-top: 1px solid #e2e8f0; color: #64748b; font-size: 14px; }
        </style>
    </head>
    <body>
        <div class="header">
            <div class="logo">🗳️ METI E-Voting Platform</div>
            <p>Sistem Pemilihan Elektronik METI (New & Renewable Energy)</p>
        </div>
        
        <div class="content">
            <h2>Selamat Datang, ${data.name}!</h2>
            
            <p>Akun Anda telah berhasil dibuat di Platform E-Voting METI. Berikut adalah informasi akun Anda:</p>
            
            <div class="credentials-box">
                <h3>📋 Informasi Akun</h3>
                <div class="credential-item">
                    <span class="credential-label">Nama Lengkap:</span>
                    <span>${data.name}</span>
                </div>
                <div class="credential-item">
                    <span class="credential-label">ID Anggota:</span>
                    <span class="credential-value">${data.memberId}</span>
                </div>
                <div class="credential-item">
                    <span class="credential-label">Departemen:</span>
                    <span>${data.department}</span>
                </div>
                <div class="credential-item">
                    <span class="credential-label">Email:</span>
                    <span>${data.email}</span>
                </div>
            </div>

            <div class="credentials-box">
                <h3>🔐 Kredensial Login</h3>
                <div class="credential-item">
                    <span class="credential-label">Username:</span>
                    <span class="credential-value">${data.username}</span>
                </div>
                <div class="credential-item">
                    <span class="credential-label">Password:</span>
                    <span class="credential-value">${data.password}</span>
                </div>
            </div>

            <div class="warning">
                <strong>⚠️ Penting:</strong>
                <ul>
                    <li>Akun Anda saat ini berstatus <strong>PENDING</strong> dan menunggu verifikasi admin</li>
                    <li>Anda belum dapat login hingga akun diverifikasi</li>
                    <li>Simpan kredensial login ini dengan aman</li>
                    <li>Jangan bagikan informasi login kepada orang lain</li>
                </ul>
            </div>

            <div style="text-align: center;">
                <a href="${data.loginUrl}" class="button">🚀 Login ke Platform</a>
            </div>

            <h3>📝 Langkah Selanjutnya:</h3>
            <ol>
                <li>Tunggu email konfirmasi verifikasi dari admin</li>
                <li>Setelah diverifikasi, login menggunakan kredensial di atas</li>
                <li>Ikuti event voting yang tersedia</li>
                <li>Berikan suara Anda untuk kandidat pilihan</li>
            </ol>

            <p>Jika Anda memiliki pertanyaan, silakan hubungi administrator METI.</p>
        </div>

        <div class="footer">
            <p>Email ini dikirim secara otomatis oleh sistem METI E-Voting Platform</p>
            <p>© 2024 METI (New & Renewable Energy). All rights reserved.</p>
        </div>
    </body>
    </html>
    `
  }

  private getStatusChangeEmailTemplate(data: StatusChangeEmailData): string {
    const statusInfo = this.getStatusInfo(data.status)

    return `
    <!DOCTYPE html>
    <html lang="id">
    <head>
        <meta charset="UTF-8">
        <meta name="viewport" content="width=device-width, initial-scale=1.0">
        <title>Update Status Akun - METI E-Voting</title>
        <style>
            body { font-family: Arial, sans-serif; line-height: 1.6; color: #333; max-width: 600px; margin: 0 auto; padding: 20px; }
            .header { background: ${statusInfo.headerColor}; color: white; padding: 30px; text-align: center; border-radius: 10px 10px 0 0; }
            .logo { font-size: 24px; font-weight: bold; margin-bottom: 10px; }
            .content { background: #f8fafc; padding: 30px; border-radius: 0 0 10px 10px; }
            .status-box { background: white; border: 2px solid ${statusInfo.borderColor}; border-radius: 8px; padding: 20px; margin: 20px 0; text-align: center; }
            .status-icon { font-size: 48px; margin-bottom: 15px; }
            .status-title { font-size: 24px; font-weight: bold; color: ${statusInfo.textColor}; margin-bottom: 10px; }
            .button { display: inline-block; background: ${statusInfo.buttonColor}; color: white; padding: 12px 24px; text-decoration: none; border-radius: 6px; margin: 20px 0; font-weight: bold; }
            .info-box { background: ${statusInfo.bgColor}; border: 1px solid ${statusInfo.borderColor}; padding: 15px; border-radius: 6px; margin: 20px 0; }
            .footer { text-align: center; margin-top: 30px; padding-top: 20px; border-top: 1px solid #e2e8f0; color: #64748b; font-size: 14px; }
        </style>
    </head>
    <body>
        <div class="header">
            <div class="logo">🗳️ METI E-Voting Platform</div>
            <p>Update Status Keanggotaan</p>
        </div>
        
        <div class="content">
            <h2>Halo, ${data.name}!</h2>
            
            <div class="status-box">
                <div class="status-icon">${statusInfo.icon}</div>
                <div class="status-title">${statusInfo.title}</div>
                <p>${statusInfo.description}</p>
            </div>

            <div class="info-box">
                <h3>📋 Informasi Akun</h3>
                <p><strong>Nama:</strong> ${data.name}</p>
                <p><strong>ID Anggota:</strong> ${data.memberId}</p>
                <p><strong>Departemen:</strong> ${data.department}</p>
                <p><strong>Status Saat Ini:</strong> <strong style="color: ${statusInfo.textColor}">${statusInfo.statusText}</strong></p>
            </div>

            ${statusInfo.actionText}

            ${
              data.status === "verified"
                ? `
            <div style="text-align: center;">
                <a href="${data.loginUrl}" class="button">🚀 Login & Mulai Voting</a>
            </div>
            `
                : ""
            }

            <p>Jika Anda memiliki pertanyaan tentang status akun ini, silakan hubungi administrator METI.</p>
        </div>

        <div class="footer">
            <p>Email ini dikirim secara otomatis oleh sistem METI E-Voting Platform</p>
            <p>© 2024 METI (New & Renewable Energy). All rights reserved.</p>
        </div>
    </body>
    </html>
    `
  }

  private getVotingReminderEmailTemplate(data: VotingReminderEmailData): string {
    return `
    <!DOCTYPE html>
    <html lang="id">
    <head>
        <meta charset="UTF-8">
        <meta name="viewport" content="width=device-width, initial-scale=1.0">
        <title>Reminder Voting - METI E-Voting</title>
        <style>
            body { font-family: Arial, sans-serif; line-height: 1.6; color: #333; max-width: 600px; margin: 0 auto; padding: 20px; }
            .header { background: linear-gradient(135deg, #dc2626 0%, #ef4444 100%); color: white; padding: 30px; text-align: center; border-radius: 10px 10px 0 0; }
            .logo { font-size: 24px; font-weight: bold; margin-bottom: 10px; }
            .content { background: #f8fafc; padding: 30px; border-radius: 0 0 10px 10px; }
            .event-box { background: white; border: 2px solid #fbbf24; border-radius: 8px; padding: 20px; margin: 20px 0; }
            .button { display: inline-block; background: #dc2626; color: white; padding: 12px 24px; text-decoration: none; border-radius: 6px; margin: 20px 0; font-weight: bold; }
            .urgent { background: #fef2f2; border: 1px solid #fca5a5; padding: 15px; border-radius: 6px; margin: 20px 0; }
            .footer { text-align: center; margin-top: 30px; padding-top: 20px; border-top: 1px solid #e2e8f0; color: #64748b; font-size: 14px; }
        </style>
    </head>
    <body>
        <div class="header">
            <div class="logo">⏰ METI E-Voting Platform</div>
            <p>Reminder Voting</p>
        </div>
        
        <div class="content">
            <h2>Halo, ${data.name}!</h2>
            
            <div class="urgent">
                <h3>🚨 Jangan Lupa Voting!</h3>
                <p>Ini adalah pengingat bahwa Anda belum memberikan suara untuk event voting yang sedang berlangsung.</p>
            </div>

            <div class="event-box">
                <h3>📊 Informasi Event</h3>
                <p><strong>Event:</strong> ${data.eventTitle}</p>
                <p><strong>Batas Waktu:</strong> ${new Date(data.eventEndDate).toLocaleDateString("id-ID", {
                  weekday: "long",
                  year: "numeric",
                  month: "long",
                  day: "numeric",
                  hour: "2-digit",
                  minute: "2-digit",
                })}</p>
                <p><strong>Status:</strong> Belum Voting</p>
            </div>

            <div style="text-align: center;">
                <a href="${data.votingUrl}" class="button">🗳️ Voting Sekarang</a>
            </div>

            <h3>💡 Mengapa Suara Anda Penting?</h3>
            <ul>
                <li>Setiap suara menentukan masa depan METI</li>
                <li>Partisipasi Anda sangat berharga</li>
                <li>Proses demokratis membutuhkan keterlibatan semua anggota</li>
            </ul>

            <p><strong>Catatan:</strong> Pastikan Anda voting sebelum batas waktu berakhir. Setelah event ditutup, Anda tidak dapat lagi memberikan suara.</p>
        </div>

        <div class="footer">
            <p>Email ini dikirim secara otomatis oleh sistem METI E-Voting Platform</p>
            <p>© 2024 METI (New & Renewable Energy). All rights reserved.</p>
        </div>
    </body>
    </html>
    `
  }

  private getStatusInfo(status: string) {
    switch (status) {
      case "verified":
        return {
          icon: "✅",
          title: "Akun Terverifikasi!",
          description: "Selamat! Akun Anda telah diverifikasi dan dapat digunakan untuk voting.",
          statusText: "TERVERIFIKASI",
          headerColor: "linear-gradient(135deg, #059669 0%, #10b981 100%)",
          borderColor: "#10b981",
          textColor: "#059669",
          buttonColor: "#059669",
          bgColor: "#ecfdf5",
          actionText:
            "<p><strong>✨ Apa yang bisa Anda lakukan sekarang:</strong></p><ul><li>Login ke platform e-voting</li><li>Ikuti event voting yang tersedia</li><li>Berikan suara untuk kandidat pilihan Anda</li><li>Lihat hasil voting real-time</li></ul>",
        }
      case "rejected":
        return {
          icon: "❌",
          title: "Verifikasi Ditolak",
          description:
            "Maaf, verifikasi akun Anda ditolak. Silakan hubungi administrator untuk informasi lebih lanjut.",
          statusText: "DITOLAK",
          headerColor: "linear-gradient(135deg, #dc2626 0%, #ef4444 100%)",
          borderColor: "#ef4444",
          textColor: "#dc2626",
          buttonColor: "#dc2626",
          bgColor: "#fef2f2",
          actionText:
            "<p><strong>📞 Langkah selanjutnya:</strong></p><ul><li>Hubungi administrator METI</li><li>Tanyakan alasan penolakan</li><li>Perbaiki dokumen atau informasi yang diperlukan</li><li>Ajukan ulang jika memungkinkan</li></ul>",
        }
      case "pending":
        return {
          icon: "⏳",
          title: "Status Ditangguhkan",
          description: "Akun Anda sementara ditangguhkan dan sedang dalam review ulang.",
          statusText: "DITANGGUHKAN",
          headerColor: "linear-gradient(135deg, #d97706 0%, #f59e0b 100%)",
          borderColor: "#f59e0b",
          textColor: "#d97706",
          buttonColor: "#d97706",
          bgColor: "#fffbeb",
          actionText:
            "<p><strong>⏰ Yang perlu Anda ketahui:</strong></p><ul><li>Akun Anda sedang dalam review</li><li>Anda tidak dapat login sementara waktu</li><li>Tunggu email konfirmasi lebih lanjut</li><li>Hubungi admin jika ada pertanyaan</li></ul>",
        }
      default:
        return {
          icon: "❓",
          title: "Status Tidak Dikenal",
          description: "Status akun Anda tidak dapat diidentifikasi.",
          statusText: "TIDAK DIKENAL",
          headerColor: "linear-gradient(135deg, #6b7280 0%, #9ca3af 100%)",
          borderColor: "#9ca3af",
          textColor: "#6b7280",
          buttonColor: "#6b7280",
          bgColor: "#f9fafb",
          actionText: "<p>Silakan hubungi administrator untuk klarifikasi status akun Anda.</p>",
        }
    }
  }
}

export const emailService = new EmailService()