import type { PaymentReport } from '@/types/services/analytic'

export class ExcelExportPaymentService {
  /**
   * Export Payment Method Report to Excel
   */
  static async exportPaymentMethodToExcel(paymentData: PaymentReport, filename?: string) {
    try {
      // Dynamic import untuk xlsx library
      const XLSX = await import('xlsx')

      // Prepare data untuk Excel
      const worksheetData: any[][] = []

      // Header dengan report info (baris 1-2)
      worksheetData.push(['LAPORAN METODE PEMBAYARAN']) // Row 0 - Main title
      worksheetData.push([`Periode: ${paymentData.date_from.split('T')[0]} - ${paymentData.date_to.split('T')[0]}`]) // Row 1 - Period
      worksheetData.push([]) // Empty row

      // Add Summary Section
      worksheetData.push(['RINGKASAN PERIODE']) // Section header
      worksheetData.push([]) // Empty row

      const summaryData = [
        ['Total Amount:', `Rp ${paymentData.summary.total_amount.toLocaleString('id-ID')}`],
        ['Total Orders:', paymentData.summary.total_orders.toString()],
        ['Total Payments:', paymentData.summary.total_payments.toString()],
        ['Average Order Value:', `Rp ${paymentData.summary.average_order_value.toLocaleString('id-ID')}`]
      ]

      summaryData.forEach(row => {
        worksheetData.push([row[0], row[1]]) // Only 2 columns needed
      })

      worksheetData.push([]) // Empty row
      worksheetData.push([]) // Empty row

      // Payment Method Details Section Header
      worksheetData.push(['RINCIAN METODE PEMBAYARAN']) // Section header
      worksheetData.push([]) // Empty row

      // Header row untuk tabel payment method data
      const headerRow = ['No', 'Metode Pembayaran', 'Tipe', 'Jumlah Order', 'Total Amount', 'Persentase']
      worksheetData.push(headerRow)

      // Add payment method data rows
      paymentData.data.forEach((payment, index) => {
        const rowData = [
          index + 1, // No
          payment.payment_method_name,
          payment.payment_method_type.toUpperCase(),
          payment.order_count,
          payment.total_amount, // Store as number for Excel formatting
          `${(payment.percentage ?? 0).toFixed(1)}%`
        ]
        worksheetData.push(rowData)
      })

      // Add total row
      const totalRow = ['TOTAL', '', '', paymentData.summary.total_orders, paymentData.summary.total_amount, '100.0%']
      worksheetData.push(totalRow)

      // Create workbook dan worksheet
      const workbook = XLSX.utils.book_new()
      const worksheet = XLSX.utils.aoa_to_sheet(worksheetData)

      // Apply basic formatting
      this.applyBasicFormatting(worksheet, worksheetData.length, XLSX)

      // Add worksheet ke workbook
      XLSX.utils.book_append_sheet(workbook, worksheet, 'Metode Pembayaran')

      // Generate filename
      const exportFilename = filename || this.generateFilename('Metode_Pembayaran')

      // Download file
      XLSX.writeFile(workbook, exportFilename)

      return { success: true, filename: exportFilename }
    } catch (error) {
      console.error('Error exporting to Excel:', error)
      return { success: false, error: 'Failed to export Excel file' }
    }
  }

  /**
   * Apply basic formatting (SheetJS compatible)
   */
  private static applyBasicFormatting(worksheet: any, totalRows: number, XLSX: any) {
    // Set column widths
    const colWidths = [
      { wch: 8 }, // No
      { wch: 25 }, // Metode Pembayaran
      { wch: 12 }, // Tipe
      { wch: 15 }, // Jumlah Order
      { wch: 20 }, // Total Amount
      { wch: 12 } // Persentase
    ]
    worksheet['!cols'] = colWidths

    // Set row heights for better spacing
    worksheet['!rows'] = [
      { hpt: 30 }, // Title row
      { hpt: 25 }, // Period row
      { hpt: 15 }, // Empty row
      { hpt: 25 }, // Summary header
      { hpt: 15 } // Empty row
    ]

    // Merge cells untuk headers
    const merges = [
      { s: { r: 0, c: 0 }, e: { r: 0, c: 5 } }, // Title (span across all columns)
      { s: { r: 1, c: 0 }, e: { r: 1, c: 5 } }, // Period (span across all columns)
      { s: { r: 3, c: 0 }, e: { r: 3, c: 5 } } // Summary header (span across all columns)
    ]

    // Find and add merge for payment method details header
    for (let i = 0; i < totalRows; i++) {
      const cell = worksheet[XLSX.utils.encode_cell({ r: i, c: 0 })]
      if (cell && cell.v === 'RINCIAN METODE PEMBAYARAN') {
        merges.push({ s: { r: i, c: 0 }, e: { r: i, c: 5 } }) // Span across all columns
        break
      }
    }

    worksheet['!merges'] = merges

    // Apply number formatting untuk currency cells
    this.applyNumberFormatting(worksheet, totalRows, XLSX)
  }

  /**
   * Apply number formatting for currency and styling
   */
  private static applyNumberFormatting(worksheet: any, totalRows: number, XLSX: any) {
    // Find table data start (after header row)
    let dataStartRow = -1
    for (let i = 0; i < totalRows; i++) {
      const cell = worksheet[XLSX.utils.encode_cell({ r: i, c: 0 })]
      if (cell && cell.v === 'No') {
        dataStartRow = i + 1
        break
      }
    }

    if (dataStartRow === -1) return

    // Count actual data rows (excluding total row)
    const dataRowsCount = totalRows - dataStartRow - 1 // -1 for total row

    // Apply currency formatting to Total Amount column (column 4 - index 4)
    for (let row = dataStartRow; row <= dataStartRow + dataRowsCount; row++) {
      // Include total row
      const cellAddress = XLSX.utils.encode_cell({ r: row, c: 4 }) // Total Amount column
      const cell = worksheet[cellAddress]

      if (cell && typeof cell.v === 'number') {
        // Apply Indonesian currency format
        cell.z = '#,##0'
        cell.t = 'n'
      }
    }

    // Apply styling to header row
    const headerRowIndex = dataStartRow - 1
    for (let col = 0; col < 6; col++) {
      const cellAddress = XLSX.utils.encode_cell({ r: headerRowIndex, c: col })
      const cell = worksheet[cellAddress]

      if (cell) {
        // Apply bold formatting (basic approach for SheetJS)
        cell.s = {
          font: { bold: true },
          fill: { fgColor: { rgb: 'F3F4F6' } }, // Light gray background
          border: {
            bottom: { style: 'medium', color: { rgb: '000000' } }
          }
        }
      }
    }

    // Apply styling to total row
    const totalRowIndex = dataStartRow + dataRowsCount
    for (let col = 0; col < 6; col++) {
      const cellAddress = XLSX.utils.encode_cell({ r: totalRowIndex, c: col })
      const cell = worksheet[cellAddress]

      if (cell) {
        // Apply bold formatting for total row
        cell.s = {
          font: { bold: true },
          border: {
            top: { style: 'medium', color: { rgb: '000000' } }
          }
        }
      }
    }
  }

  /**
   * Generate filename with timestamp
   */
  private static generateFilename(prefix: string): string {
    const now = new Date()
    const year = now.getFullYear()
    const month = (now.getMonth() + 1).toString().padStart(2, '0')
    const day = now.getDate().toString().padStart(2, '0')
    const hour = now.getHours().toString().padStart(2, '0')
    const minute = now.getMinutes().toString().padStart(2, '0')

    return `${prefix}_${year}_${month}_${day}_${hour}${minute}.xlsx`
  }

  /**
   * Export Payment Method data with custom configuration
   */
  static async exportCustomPaymentData(
    data: any[][],
    sheetName: string = 'Payment Method',
    filename?: string,
    options?: {
      colWidths?: { wch: number }[]
      merges?: { s: { r: number; c: number }; e: { r: number; c: number } }[]
    }
  ) {
    try {
      const XLSX = await import('xlsx')

      const workbook = XLSX.utils.book_new()
      const worksheet = XLSX.utils.aoa_to_sheet(data)

      // Apply options
      if (options?.colWidths) {
        worksheet['!cols'] = options.colWidths
      }
      if (options?.merges) {
        worksheet['!merges'] = options.merges
      }

      XLSX.utils.book_append_sheet(workbook, worksheet, sheetName)

      const exportFilename = filename || this.generateFilename('Payment_Method_Export')
      XLSX.writeFile(workbook, exportFilename)

      return { success: true, filename: exportFilename }
    } catch (error) {
      console.error('Error exporting to Excel:', error)
      return { success: false, error: 'Failed to export Excel file' }
    }
  }
}