/*
 * Copyright (C) 2017, David PHAM-VAN <dev.nfet.net@gmail.com>
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import 'dart:async';
import 'dart:io';

import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:open_file/open_file.dart';
import 'package:path_provider/path_provider.dart';
import 'package:pdf/pdf.dart';
import 'package:pdf/widgets.dart' as pw;
import 'package:printing/printing.dart';
import 'package:printing_demo/certificate.dart';
import 'package:url_launcher/url_launcher.dart' as ul;

import 'calendar.dart';
import 'document.dart';
import 'invoice.dart';
import 'report.dart';
import 'resume.dart';

class MyApp extends StatefulWidget {
  static const examples = <Example>[
    Example('RÉSUMÉ', 'resume.dart', generateResume),
    Example('DOCUMENT', 'document.dart', generateDocument),
    Example('INVOICE', 'invoice.dart', generateInvoice),
    Example('REPORT', 'report.dart', generateReport),
    Example('CALENDAR', 'calendar.dart', generateCalendar),
    Example('CERTIFICATE', 'certificate.dart', generateCertificate),
  ];

  @override
  MyAppState createState() {
    return MyAppState();
  }
}

class MyAppState extends State<MyApp> with SingleTickerProviderStateMixin {
  int _tab = 0;
  TabController? _tabController;

  PrintingInfo? printingInfo;

  @override
  void initState() {
    super.initState();
    _init();
  }

  Future<void> _init() async {
    final info = await Printing.info();

    _tabController = TabController(
      vsync: this,
      length: MyApp.examples.length,
      initialIndex: _tab,
    );
    _tabController!.addListener(() {
      setState(() {
        _tab = _tabController!.index;
      });
    });

    setState(() {
      printingInfo = info;
    });
  }

  void _showPrintedToast(BuildContext context) {
    final scaffold = Scaffold.of(context);

    // ignore: deprecated_member_use
    scaffold.showSnackBar(
      const SnackBar(
        content: Text('Document printed successfully'),
      ),
    );
  }

  void _showSharedToast(BuildContext context) {
    final scaffold = Scaffold.of(context);

    // ignore: deprecated_member_use
    scaffold.showSnackBar(
      const SnackBar(
        content: Text('Document shared successfully'),
      ),
    );
  }

  Future<void> _saveAsFile(
    BuildContext context,
    LayoutCallback build,
    PdfPageFormat pageFormat,
  ) async {
    final bytes = await build(pageFormat);

    final appDocDir = await getApplicationDocumentsDirectory();
    final appDocPath = appDocDir.path;
    final file = File(appDocPath + '/' + 'document.pdf');
    print('Save as file ${file.path} ...');
    await file.writeAsBytes(bytes);
    await OpenFile.open(file.path);
  }

  @override
  Widget build(BuildContext context) {
    pw.RichText.debug = true;

    if (_tabController == null) {
      return const Center(child: CircularProgressIndicator());
    }

    final actions = <PdfPreviewAction>[
      if (!kIsWeb)
        PdfPreviewAction(
          icon: const Icon(Icons.save),
          onPressed: _saveAsFile,
        )
    ];

    return Scaffold(
      appBar: AppBar(
        title: const Text('Pdf Printing Example'),
        bottom: TabBar(
          controller: _tabController,
          tabs: MyApp.examples.map<Tab>((e) => Tab(text: e.name)).toList(),
          isScrollable: true,
        ),
      ),
      body: PdfPreview(
        maxPageWidth: 700,
        build: MyApp.examples[_tab].builder,
        actions: actions,
        onPrinted: _showPrintedToast,
        onShared: _showSharedToast,
      ),
      floatingActionButton: FloatingActionButton(
        backgroundColor: Colors.deepOrange,
        onPressed: _showSources,
        child: const Icon(Icons.code),
      ),
    );
  }

  void _showSources() {
    ul.launch(
      'https://github.com/DavBfr/dart_pdf/blob/master/demo/lib/${MyApp.examples[_tab].file}',
    );
  }
}

class Example {
  const Example(this.name, this.file, this.builder);

  final String name;

  final String file;

  final LayoutCallback builder;
}