import 'dart:typed_data';

import 'package:dadtuber/date_utils.dart';
import 'package:dadtuber/index_file.dart';
import 'package:flutter/material.dart';
import 'package:path_provider/path_provider.dart';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'DadTuber',
      theme: ThemeData(
        // This is the theme of your application.
        //
        // TRY THIS: Try running your application with "flutter run". You'll see
        // the application has a purple toolbar. Then, without quitting the app,
        // try changing the seedColor in the colorScheme below to Colors.green
        // and then invoke "hot reload" (save your changes or press the "hot
        // reload" button in a Flutter-supported IDE, or press "r" if you used
        // the command line to start the app).
        //
        // Notice that the counter didn't reset back to zero; the application
        // state is not lost during the reload. To reset the state, use hot
        // restart instead.
        //
        // This works for code too, not just values: Most code changes can be
        // tested with just a hot reload.
        colorScheme: ColorScheme.fromSeed(seedColor: Colors.red),
        useMaterial3: true,
        elevatedButtonTheme: ElevatedButtonThemeData(
          style: ElevatedButton.styleFrom(minimumSize: Size.fromRadius(24)),
        ),
      ),
      home: const MyHomePage(title: 'DadTuber'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({super.key, required this.title});

  // This widget is the home page of your application. It is stateful, meaning
  // that it has a State object (defined below) that contains fields that affect
  // how it looks.

  // This class is the configuration for the state. It holds the values (in this
  // case the title) provided by the parent (in this case the App widget) and
  // used by the build method of the State. Fields in a Widget subclass are
  // always marked "final".

  final String title;

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  late Future<ProjectIndex> _projectIndexBuilder;

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

    builder() async {
      final dir = await getApplicationDocumentsDirectory();
      final path = "${dir.path}/index";

      try {
        return ProjectIndex.load(path);
      } catch (_) {
        return ProjectIndex.blank();
      }
    }

    _projectIndexBuilder = builder();
  }

  @override
  Widget build(BuildContext context) {
    // This method is rerun every time setState is called, for instance as done
    // by the _incrementCounter method above.
    //
    // The Flutter framework has been optimized to make rerunning build methods
    // fast, so that you can just rebuild anything that needs updating rather
    // than having to individually change instances of widgets.
    return Scaffold(
      appBar: AppBar(
        // TRY THIS: Try changing the color here to a specific color (to
        // Colors.amber, perhaps?) and trigger a hot reload to see the AppBar
        // change color while the other colors stay the same.
        backgroundColor: Theme.of(context).colorScheme.inversePrimary,
        // Here we take the value from the MyHomePage object that was created by
        // the App.build method, and use it to set our appbar title.
        title: Text(widget.title),
      ),
      body: FocusTraversalGroup(
        policy: WidgetOrderTraversalPolicy(),
        child: OrientationBuilder(
          builder: (context, orientation) =>
              orientation == Orientation.landscape
                  ? Container(
                      padding: EdgeInsets.all(24),
                      child: Row(
                        spacing: 48,
                        children: [
                          CreateNewColumn(showHeader: true),
                          Expanded(
                            child: SavedProjectsColumn(
                              projectIndexBuilder: _projectIndexBuilder,
                              showHeader: true,
                            ),
                          ),
                        ],
                      ),
                    )
                  : Column(
                      spacing: 16,
                      children: [
                        CreateNewColumn(showHeader: false),
                        Expanded(
                          child: SavedProjectsColumn(
                            projectIndexBuilder: _projectIndexBuilder,
                            showHeader: false,
                          ),
                        ),
                      ],
                    ),
        ),
      ),
    );
  }
}

class CreateNewColumn extends StatelessWidget {
  final bool showHeader;

  const CreateNewColumn({required this.showHeader, super.key});

  @override
  Widget build(BuildContext context) {
    return Column(
      spacing: 12,
      children: [
        showHeader
            ? Text(
                "Create New",
                style: TextStyle(fontSize: 24, fontWeight: FontWeight.bold),
              )
            : SizedBox(),
        ElevatedButton.icon(
          icon: Icon(Icons.video_file),
          onPressed: () => (),
          label: Text('Create a new video'),
        ),
        ElevatedButton.icon(
          icon: Icon(Icons.image),
          onPressed: () => (),
          label: Text('Create a new image'),
        ),
        ElevatedButton.icon(
          icon: Icon(Icons.audio_file),
          onPressed: () => (),
          label: Text('Create a new sound'),
        ),
      ],
    );
  }
}

class SavedProjectsColumn extends StatelessWidget {
  final bool showHeader;
  final Future<ProjectIndex> projectIndexBuilder;

  const SavedProjectsColumn({
    required this.projectIndexBuilder,
    required this.showHeader,
    super.key,
  });

  @override
  Widget build(BuildContext context) {
    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        Padding(
          padding: EdgeInsets.symmetric(horizontal: 12),
          child: Text(
            "Saved Projects",
            style: TextStyle(fontSize: 24, fontWeight: FontWeight.bold),
          ),
        ),
        Expanded(
          child: FutureBuilder(
            future: projectIndexBuilder,
            builder: (cx, snapshot) {
              if (snapshot.hasData) {
                return SavedProjectsListView(snapshot.data!);
              } else if (snapshot.hasError) {
                return Center(child: Text("An error occurred"));
              } else {
                return Center(child: CircularProgressIndicator());
              }
            },
          ),
        ),
      ],
    );
  }
}

class SavedProjectsListView extends StatelessWidget {
  final ProjectIndex _projectIndex;

  const SavedProjectsListView(this._projectIndex, {super.key});

  @override
  Widget build(BuildContext context) {
    return ListView.builder(
      addAutomaticKeepAlives: false,
      itemCount: _projectIndex.projects.length,
      itemBuilder: (cx, idx) {
        final project = _projectIndex.projects[idx];
        return SavedProjectTile(
          title: project.title,
          image: _projectIndex.getImage(project.title),
          lastModified: project.lastModified,
          projectType: project.type,
        );
      },
    );
  }
}

class SavedProjectTile extends StatelessWidget {
  final String title;
  final Uint8List? image;
  final DateTime lastModified;
  final ProjectType projectType;

  const SavedProjectTile({
    required this.title,
    this.image,
    required this.lastModified,
    required this.projectType,
    super.key,
  });

  @override
  Widget build(BuildContext context) {
    return ListTile(
      leading: SavedProjectThumbnail(projectType: projectType, image: image),
      title: Text(
        title,
        overflow: TextOverflow.ellipsis,
      ),
      subtitle: Text('Edited ${daysAgo(lastModified)}'),
      trailing: Text(projectType.normalString()),
      onTap: () => (),
    );
  }
}

class SavedProjectThumbnail extends StatelessWidget {
  final ProjectType projectType;
  final Uint8List? image;

  const SavedProjectThumbnail({
    required this.projectType,
    required this.image,
    super.key,
  });

  @override
  Widget build(BuildContext context) {
    return SizedBox(
      width: 96,
      height: 54,
      child: Stack(
        children: [
          image != null
              ? Image.memory(image!, width: 80, height: 45)
              : SizedBox(width: 80, height: 45),
          Center(
            child: Opacity(opacity: 0.5, child: Icon(projectType.icon())),
          ),
        ],
      ),
    );
  }
}