import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:flutter/widgets.dart';
import 'package:photos/core/constants.dart';
import 'package:photos/models/duplicate_files.dart';
import 'package:photos/models/file.dart';
import 'package:photos/ui/thumbnail_widget.dart';
import 'package:photos/utils/data_util.dart';

class DeduplicatePage extends StatelessWidget {
  final List<DuplicateFiles> duplicates;

  DeduplicatePage(this.duplicates, {Key key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Hero(
          tag: "deduplicate",
          child: Material(
            type: MaterialType.transparency,
            child: Text(
              "deduplicate files",
              style: TextStyle(
                fontSize: 18,
              ),
            ),
          ),
        ),
      ),
      body: _getBody(),
    );
  }

  Widget _getBody() {
    return Column(
      mainAxisAlignment: MainAxisAlignment.center,
      crossAxisAlignment: CrossAxisAlignment.center,
      children: [
        Expanded(
          child: ListView.builder(
            itemBuilder: (context, index) {
              if (index == 0) {
                return Padding(
                  padding: EdgeInsets.fromLTRB(12, 4, 12, 4),
                  child: Column(
                    children: [
                      Text(
                        "we've clubbed the following files based on their sizes",
                        style: TextStyle(
                          color: Colors.white.withOpacity(0.6),
                          height: 1.2,
                        ),
                      ),
                      Padding(
                        padding: EdgeInsets.all(4),
                      ),
                      Text(
                        "please review and delete the items you believe are duplicates",
                        style: TextStyle(
                          color: Colors.white.withOpacity(0.6),
                          height: 1.2,
                        ),
                      ),
                    ],
                  ),
                );
              }
              return Padding(
                padding: const EdgeInsets.only(top: 8, bottom: 8),
                child: _getGridView(duplicates[index - 1]),
              );
            },
            itemCount: duplicates.length,
            shrinkWrap: true,
          ),
        ),
        Padding(padding: EdgeInsets.all(4)),
        Padding(
          padding: EdgeInsets.all(8),
          child: Text(
            "delete",
            style: TextStyle(
              color: Colors.white.withOpacity(0.8),
              height: 1.2,
            ),
          ),
        ),
      ],
    );
  }

  Widget _getGridView(DuplicateFiles duplicates) {
    return Column(
      children: [
        Padding(
          padding: const EdgeInsets.fromLTRB(4, 8, 4, 4),
          child: Text(
            duplicates.files.length.toString() +
                " files, " +
                convertBytesToReadableFormat(duplicates.size) +
                " each",
            style: TextStyle(
              color: Colors.white.withOpacity(0.8),
            ),
          ),
        ),
        GridView.builder(
          shrinkWrap: true,
          physics:
              NeverScrollableScrollPhysics(), // to disable GridView's scrolling
          itemBuilder: (context, index) {
            return _buildFile(context, duplicates.files[index], index);
          },
          itemCount: duplicates.files.length,
          gridDelegate: SliverGridDelegateWithFixedCrossAxisCount(
            crossAxisCount: 4,
          ),
          padding: EdgeInsets.all(0),
        ),
      ],
    );
  }

  Widget _buildFile(BuildContext context, File file, int index) {
    return GestureDetector(
      onTap: () {
        // TODO
      },
      onLongPress: () {
        HapticFeedback.lightImpact();
        // TODO
      },
      child: Container(
        margin: const EdgeInsets.all(2.0),
        decoration: BoxDecoration(
          border: index == 0
              ? null
              : Border.all(
                  width: 4.0,
                  color: Colors.red,
                ),
        ),
        child: Hero(
          tag: "deduplicate_" + file.tag(),
          child: ThumbnailWidget(
            file,
            diskLoadDeferDuration: kThumbnailDiskLoadDeferDuration,
            serverLoadDeferDuration: kThumbnailServerLoadDeferDuration,
            shouldShowLivePhotoOverlay: true,
            key: Key("deduplicate_" + file.tag()),
          ),
        ),
      ),
    );
  }
}