import 'dart:io';
import 'package:pdf/pdf.dart';
import 'package:pdf/widgets.dart' as pw;
import 'package:excel/excel.dart';
import 'package:path_provider/path_provider.dart';
import 'package:intl/intl.dart';
import '../models/task_log_model.dart';

class ReportService {
  Future<File> generatePDF(List<TaskLogModel> logs, DateTime from, DateTime to) async {
    final pdf = pw.Document();
    final DateFormat formatter = DateFormat('dd MMM yyyy');

    pdf.addPage(
      pw.MultiPage(
        pageFormat: PdfPageFormat.a4,
        build: (pw.Context context) => [
          pw.Header(
            level: 0,
            child: pw.Text("Team Work Log Report", style: pw.TextStyle(fontSize: 24, fontWeight: pw.FontWeight.bold)),
          ),
          pw.Text("Date Range: ${formatter.format(from)} - ${formatter.format(to)}"),
          pw.SizedBox(height: 20),
          pw.TableHelper.fromTextArray(
            headers: ["Date", "Member", "Project", "Branch", "Module", "Status", "Remarks"],
            data: logs.map((log) => [
              formatter.format(log.date),
              log.userName,
              log.projectName,
              log.branchName,
              log.moduleName,
              log.status.replaceAll('_', ' ').toUpperCase(),
              log.remarks,
            ]).toList(),
            headerStyle: pw.TextStyle(fontWeight: pw.FontWeight.bold),
            cellAlignment: pw.Alignment.centerLeft,
          ),
          pw.SizedBox(height: 20),
          pw.Text("Total Entries: ${logs.length}"),
        ],
      ),
    );

    Directory tempDir = await getApplicationDocumentsDirectory();
    final file = File("${tempDir.path}/Report_${DateTime.now().millisecondsSinceEpoch}.pdf");
    await file.writeAsBytes(await pdf.save());
    return file;
  }

  Future<File> generateExcel(List<TaskLogModel> logs) async {
    var excel = Excel.createExcel();
    Sheet sheet = excel['Work Logs'];
    excel.delete('Sheet1');

    DateFormat formatter = DateFormat('dd MMM yyyy');

    sheet.appendRow([
      TextCellValue("Date"), 
      TextCellValue("Member"), 
      TextCellValue("Project"), 
      TextCellValue("Branch"), 
      TextCellValue("Module"), 
      TextCellValue("Status"), 
      TextCellValue("Remarks")
    ]);

    for (var log in logs) {
      sheet.appendRow([
        TextCellValue(formatter.format(log.date)),
        TextCellValue(log.userName),
        TextCellValue(log.projectName),
        TextCellValue(log.branchName),
        TextCellValue(log.moduleName),
        TextCellValue(log.status.replaceAll('_', ' ').toUpperCase()),
        TextCellValue(log.remarks),
      ]);
    }

    Directory tempDir = await getApplicationDocumentsDirectory();
    final file = File("${tempDir.path}/Report_${DateTime.now().millisecondsSinceEpoch}.xlsx");
    var bytes = excel.encode();
    if (bytes != null) {
       await file.writeAsBytes(bytes);
    }
    return file;
  }
}