import 'dart:convert';
import 'package:flutter_test/flutter_test.dart';
import 'package:tasq/screens/programmer_tasks/report/accomplishment_report_data.dart';
import 'package:tasq/screens/programmer_tasks/report/accomplishment_report_pdf.dart';
import 'package:tasq/utils/programmer_day_rows.dart';

void main() {
  TestWidgetsFlutterBinding.ensureInitialized();

  AccomplishmentReportData populated() => AccomplishmentReportData(
        programmerName: 'John Doe',
        positionLabel: 'Programmer',
        periodStart: DateTime.utc(2026, 9, 1),
        periodEndInclusive: DateTime.utc(2026, 9, 30),
        days: [
          ReportDay(
            day: DateTime.utc(2026, 9, 1),
            statusTag: null,
            rows: [
              DaySheetRow(
                taskId: 't1',
                title: 'Fix login bug',
                category: 'Backend',
                kind: 'assignee',
                projectName: 'AuthService',
                helpedName: null,
                seconds: 3600,
                notes: ['Resolved null pointer exception'],
              ),
            ],
          ),
          ReportDay(
            day: DateTime.utc(2026, 9, 2),
            statusTag: 'Pending',
            rows: [
              DaySheetRow(
                taskId: 't2',
                title: 'Add unit tests',
                category: 'Testing',
                kind: 'helper',
                projectName: null,
                helpedName: 'Jane Smith',
                seconds: 1800,
                notes: [],
              ),
            ],
          ),
        ],
        excludedPending: 1,
        excludedDisapproved: 0,
        daysReported: 2,
        totalSeconds: 5400,
        tasksCompleted: 1,
        helpSeconds: 1800,
        secondsByCategory: {'Backend': 3600, 'Testing': 1800},
        approverName: 'Jane Reviewer',
      );

  AccomplishmentReportData emptyPeriod() => AccomplishmentReportData(
        programmerName: 'John Doe',
        positionLabel: 'Programmer',
        periodStart: DateTime.utc(2026, 9, 1),
        periodEndInclusive: DateTime.utc(2026, 9, 30),
        days: [],
        excludedPending: 0,
        excludedDisapproved: 0,
        daysReported: 0,
        totalSeconds: 0,
        tasksCompleted: 0,
        helpSeconds: 0,
        secondsByCategory: {},
        approverName: null,
      );

  test('populated report builds non-empty PDF bytes starting with %PDF',
      () async {
    final bytes = await buildAccomplishmentReportPdf(populated());
    expect(bytes.isNotEmpty, isTrue);
    expect(utf8.decode(bytes.sublist(0, 4)), equals('%PDF'));
  });

  test('empty period builds a valid PDF', () async {
    final bytes = await buildAccomplishmentReportPdf(emptyPeriod());
    expect(bytes.isNotEmpty, isTrue);
    expect(utf8.decode(bytes.sublist(0, 4)), equals('%PDF'));
  });
}