// Version: 1.0 - 見積書用 PDF テンプレート
import 'package:flutter/material.dart';
import 'package:flutter_pdfgenerator/flutter_pdfgenerator.dart';
import 'package:pdf/pdf.dart';
import 'package:pdf/widgets.dart' as pw;
import '../models/customer.dart';
import '../models/product.dart';
import '../models/estimate.dart';

/// 見積書用 PDF テンプレート生成クラス
class EstimateTemplate {
  /// 見積書の PDF を生成
  static Future<pw.Document> generateEstimatePdf(Estimate estimate) async {
    final doc = pw.Document();

    doc.addPage(
      pw.MultiPage(
        pageFormat: PdfPageSize.a5, // A5 サイズ
        build: (pw.Context context) => [
          _buildHeader(context, estimate),
          ...estimate.items.map((item) => _buildItemLine(item, context)),
          _buildSummary(context, estimate),
          _buildFooter(context, estimate),
        ],
      ),
    );

    return doc;
  }

  /// ヘッダーエリア
  static pw.Widget _buildHeader(pw.Context context, Estimate estimate) {
    return pw.Container(
      padding: const EdgeInsets.all(20),
      decoration: pw.BoxDecoration(color: PdfColors.white),
      child: pw.Row(
        children: [
          pw.Expanded(
            child: pw.Column(
              crossAxisAlignment: pw.CrossAxisAlignment.start,
              children: [
                pw.Text('母艦 お局様', style: pw.TextStyle(fontSize: 16, fontWeight: PdfFontWeight.bold)),
                pw.Text('会社名：〇〇株式会社'),
                pw.Text('住所：東京都港区_test 1-1-1'),
                pw.Text('TEL:03-1234-5678 / FAX:03-1234-5679'),
                pw.Text('📧 mail@example.com'),
              ],
            ),
          ),
          pw.Container(
            padding: const EdgeInsets.all(10),
            decoration: pw.BoxDecoration(color: PdfColors.blueAccent.withOpacity(0.1)),
            child: pw.Row(
              children: [
                pw.Text('見積書', style: pw.TextStyle(fontSize: 14, fontWeight: PdfFontWeight.bold)),
                const Spacer(),
                pw.Text('No. ${estimate.estimateNumber}', style: pw.TextStyle(fontSize: 12)),
              ],
            ),
          ),
        ],
      ),
    );
  }

  /// 商品明細行
  static pw.Widget _buildItemLine(EstimateItem item, pw.Context context) {
    final isEven = context.pageNumber % 2 == 0;
    
    return pw.Container(
      padding: const EdgeInsets.symmetric(vertical: 2),
      decoration: pw.BoxDecoration(
        color: isEven ? PdfColors.grey.shade50 : PdfColors.white,
        border: Border(top: pw.BorderSide(color: PdfColors.grey.shade300)),
      ),
      child: pw.Row(
        children: [
          pw.Text('#${context.pageNumber.toString().padLeft(2, '0')}', style: pw.TextStyle(fontSize: 10)),
          pw SizedBox(width: 5),
          pw.Expanded(
            child: pw.Text(item.productName, style: pw.TextStyle(fontSize: 10, overflow: pw.Overflow.ellipsis)),
          ),
          pw Container(width: 20),
          pw Text('¥${item.unitPrice.toStringAsFixed(0)}', style: pw.TextStyle(fontSize: 10)),
          pw Text(item.quantity.toString(), style: pw.TextStyle(fontSize: 10)),
          pw Text('¥${item.subtotal.toStringAsFixed(0)}', style: pw.TextStyle(fontSize: 10)),
        ],
      ),
    );
  }

  /// 合計金額エリア
  static pw.Widget _buildSummary(pw.Context context, Estimate estimate) {
    return pw.Container(
      padding: const EdgeInsets.all(20),
      decoration: pw.BoxDecoration(color: PdfColors.blue.shade50),
      child: pw.Column(
        crossAxisAlignment: pw.CrossAxisAlignment.start,
        children: [
          pw.Text('合計', style: pw.TextStyle(fontSize: 14, fontWeight: PdfFontWeight.bold)),
          const SizedBox(height: 8),
          pw.Text('¥${estimate.totalAmount.toStringAsFixed(0)}', style: pw.TextStyle(fontSize: 16, fontWeight: PdfFontWeight.bold, color: PdfColors.orange.shade500)),
          const Spacer(),
          pw.Padding(
            padding: const EdgeInsets.only(top: 20),
            child: pw.Text('備考：納期・決済条件などの注意事項', style: pw.TextStyle(fontSize: 10, fontStyle: PdfFontStyle.italic)),
          ),
        ],
      ),
    );
  }

  /// フッターエリア
  static pw.Widget _buildFooter(pw.Context context, Estimate estimate) {
    return pw.Container(
      padding: const EdgeInsets.all(20),
      decoration: pw.BoxDecoration(color: PdfColors.white),
      child: pw.Row(
        children: [
          pw.Expanded(
            child: pw.Column(
              crossAxisAlignment: pw.CrossAxisAlignment.start,
              children: [
                pw.Text('発行日：${estimate.createdAt.toLocal()}'),
                if (estimate.expiryDate != null) pw.Text('有効期限：${estimate.expiryDate!.toLocal()}'),
              ],
            ),
          ),
          pw const Spacer(),
          pw Container(
            width: 120,
            height: 80,
            decoration: pw.BoxDecoration(
              color: PdfColors.grey.shade200,
              child: pw.Center(child: pw.Text('QR コードエリア', style: pw.TextStyle(fontSize: 8))),
            ),
          ),
        ],
      ),
    );
  }
}