// Copyright 2018 the Charts project authors. Please see the AUTHORS file
// for details.
//
// 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 'package:charts_flutter/flutter.dart' as charts;
import 'package:flutter/material.dart';
import 'dart:developer';
import 'app_config.dart';
import 'drawer.dart';
import 'a11y/a11y_gallery.dart' as a11y show buildGallery;
import 'bar_chart/bar_gallery.dart' as bar show buildGallery;
import 'time_series_chart/time_series_gallery.dart' as time_series
    show buildGallery;
import 'line_chart/line_gallery.dart' as line show buildGallery;
import 'scatter_plot_chart/scatter_plot_gallery.dart' as scatter_plot
    show buildGallery;
import 'combo_chart/combo_gallery.dart' as combo show buildGallery;
import 'pie_chart/pie_gallery.dart' as pie show buildGallery;
import 'axes/axes_gallery.dart' as axes show buildGallery;
import 'behaviors/behaviors_gallery.dart' as behaviors show buildGallery;
import 'i18n/i18n_gallery.dart' as i18n show buildGallery;
import 'legends/legends_gallery.dart' as legends show buildGallery;

/// Main entry point of the gallery app.
///
/// This renders a list of all available demos.
class Home extends StatelessWidget {
  final bool showPerformanceOverlay;
  final ValueChanged<bool> onShowPerformanceOverlayChanged;
  final a11yGalleries = a11y.buildGallery();
  final barGalleries = bar.buildGallery();
  final timeSeriesGalleries = time_series.buildGallery();
  final lineGalleries = line.buildGallery();
  final scatterPlotGalleries = scatter_plot.buildGallery();
  final comboGalleries = combo.buildGallery();
  final pieGalleries = pie.buildGallery();
  final axesGalleries = axes.buildGallery();
  final behaviorsGalleries = behaviors.buildGallery();
  final i18nGalleries = i18n.buildGallery();
  final legendsGalleries = legends.buildGallery();

  Home(
      {Key key,
      this.showPerformanceOverlay,
      this.onShowPerformanceOverlayChanged})
      : super(key: key) {
    assert(onShowPerformanceOverlayChanged != null);
  }

  @override
  Widget build(BuildContext context) {
    var galleries = <Widget>[];

    galleries.addAll(
        a11yGalleries.map((gallery) => gallery.buildGalleryListTile(context)));

    // Add example bar charts.
    galleries.addAll(
        barGalleries.map((gallery) => gallery.buildGalleryListTile(context)));

    // Add example time series charts.
    galleries.addAll(timeSeriesGalleries
        .map((gallery) => gallery.buildGalleryListTile(context)));

    // Add example line charts.
    galleries.addAll(
        lineGalleries.map((gallery) => gallery.buildGalleryListTile(context)));

    // Add example scatter plot charts.
    galleries.addAll(scatterPlotGalleries
        .map((gallery) => gallery.buildGalleryListTile(context)));

    // Add example pie charts.
    galleries.addAll(
        comboGalleries.map((gallery) => gallery.buildGalleryListTile(context)));

    // Add example pie charts.
    galleries.addAll(
        pieGalleries.map((gallery) => gallery.buildGalleryListTile(context)));

    // Add example custom axis.
    galleries.addAll(
        axesGalleries.map((gallery) => gallery.buildGalleryListTile(context)));

    galleries.addAll(behaviorsGalleries
        .map((gallery) => gallery.buildGalleryListTile(context)));

    // Add legends examples
    galleries.addAll(legendsGalleries
        .map((gallery) => gallery.buildGalleryListTile(context)));

    // Add examples for i18n.
    galleries.addAll(
        i18nGalleries.map((gallery) => gallery.buildGalleryListTile(context)));

    _setupPerformance();

    return new Scaffold(
      drawer: new GalleryDrawer(
          showPerformanceOverlay: showPerformanceOverlay,
          onShowPerformanceOverlayChanged: onShowPerformanceOverlayChanged),
      appBar: new AppBar(title: new Text(defaultConfig.appName)),
      body: new ListView(padding: kMaterialListPadding, children: galleries),
    );
  }

  void _setupPerformance() {
    // Change [printPerformance] to true and set the app to release mode to
    // print performance numbers to console. By default, Flutter builds in debug
    // mode and this mode is slow. To build in release mode, specify the flag
    // blaze-run flag "--define flutter_build_mode=release".
    // The build target must also be an actual device and not the emulator.
    charts.Performance.time = (String tag) => Timeline.startSync(tag);
    charts.Performance.timeEnd = (_) => Timeline.finishSync();
  }
}