import 'dart:ui';

import 'package:exif/exif.dart';
import 'package:flutter/material.dart';
import 'package:flutter/widgets.dart';
import 'package:photos/models/file.dart';
import 'package:photos/ui/loading_widget.dart';
import 'package:photos/utils/file_util.dart';

class ExifInfoDialog extends StatefulWidget {
  final File file;
  ExifInfoDialog(this.file, {Key key}) : super(key: key);

  @override
  _ExifInfoDialogState createState() => _ExifInfoDialogState();
}

class _ExifInfoDialogState extends State<ExifInfoDialog> {
  @override
  Widget build(BuildContext context) {
    final scrollController = ScrollController();
    return AlertDialog(
      title: Text(widget.file.title),
      content: Scrollbar(
        controller: scrollController,
        isAlwaysShown: true,
        child: SingleChildScrollView(
          controller: scrollController,
          child: _getInfo(),
        ),
      ),
      actions: [
        TextButton(
          child: Text(
            "close",
            style: TextStyle(
              color: Colors.white.withOpacity(0.8),
            ),
          ),
          onPressed: () {
            Navigator.of(context, rootNavigator: true).pop('dialog');
          },
        ),
      ],
    );
  }

  Widget _getInfo() {
    return FutureBuilder(
      future: _getExif(),
      builder: (BuildContext context, AsyncSnapshot snapshot) {
        if (snapshot.hasData) {
          final exif = snapshot.data;
          String data = "";
          for (String key in exif.keys) {
            data += "$key: ${exif[key]}\n";
          }
          if (data.isEmpty) {
            data = "no exif data found";
          }
          return Container(
            padding: EdgeInsets.all(2),
            color: Colors.white.withOpacity(0.05),
            child: Center(
              child: Padding(
                padding: const EdgeInsets.all(12),
                child: Text(
                  data,
                  style: TextStyle(
                    fontSize: 14,
                    fontFeatures: const [
                      FontFeature.tabularFigures(),
                    ],
                    height: 1.4,
                    color: Colors.white.withOpacity(0.7),
                  ),
                ),
              ),
            ),
          );
        } else {
          return loadWidget;
        }
      },
    );
  }

  Future<Map<String, IfdTag>> _getExif() async {
    return await readExifFromFile(await getFile(widget.file));
  }
}