import 'dart:io';

import 'package:cached_network_image/cached_network_image.dart';
import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:flutter_redux/flutter_redux.dart';
import 'package:flutter_share/flutter_share.dart';
import 'package:http/http.dart';
import 'package:image_picker/image_picker.dart';
import 'package:invoiceninja_flutter/data/models/models.dart';
import 'package:invoiceninja_flutter/data/web_client.dart';
import 'package:invoiceninja_flutter/redux/app/app_state.dart';
import 'package:invoiceninja_flutter/ui/app/buttons/elevated_button.dart';
import 'package:invoiceninja_flutter/ui/app/lists/list_divider.dart';
import 'package:invoiceninja_flutter/utils/dialogs.dart';
import 'package:invoiceninja_flutter/utils/files.dart';
import 'package:invoiceninja_flutter/utils/formatting.dart';
import 'package:invoiceninja_flutter/utils/icons.dart';
import 'package:http/http.dart' as http;
import 'package:invoiceninja_flutter/utils/localization.dart';
import 'package:path_provider/path_provider.dart';
import 'package:permission_handler/permission_handler.dart';
import 'package:url_launcher/url_launcher.dart';

class DocumentGrid extends StatelessWidget {
  const DocumentGrid({
    @required this.documents,
    @required this.onUploadDocument,
    @required this.onDeleteDocument,
    this.onViewExpense,
  });

  final List<DocumentEntity> documents;
  final Function(MultipartFile) onUploadDocument;
  final Function(DocumentEntity, String, String) onDeleteDocument;
  final Function(DocumentEntity) onViewExpense;

  @override
  Widget build(BuildContext context) {
    final localization = AppLocalization.of(context);
    final state = StoreProvider.of<AppState>(context).state;

    return ListView(
      shrinkWrap: true,
      children: [
        if (state.isEnterprisePlan)
          Padding(
            padding: const EdgeInsets.only(left: 16, bottom: 16, right: 16),
            child: Row(
              children: <Widget>[
                if (!kIsWeb)
                  Expanded(
                    child: AppButton(
                      iconData: Icons.camera_alt,
                      label: localization.takePicture,
                      onPressed: () async {
                        final permissionStatus =
                            await [Permission.camera].request();
                        final permission =
                            permissionStatus[Permission.camera] ??
                                PermissionStatus.undetermined;

                        if (permission == PermissionStatus.granted) {
                          final image = await ImagePicker()
                              .getImage(source: ImageSource.camera);
                          if (image != null && image.path != null) {
                            final bytes = await image.readAsBytes();
                            final multipartFile = MultipartFile.fromBytes(
                                'documents[]', bytes,
                                filename: image.path.split('/').last);
                            onUploadDocument(multipartFile);
                          }
                        } else {
                          openAppSettings();
                        }
                      },
                    ),
                  ),
                if (!kIsWeb)
                  SizedBox(
                    width: 14,
                  ),
                Expanded(
                  child: AppButton(
                    iconData: Icons.insert_drive_file,
                    label: localization.uploadFile,
                    onPressed: () async {
                      final multipartFile = await pickFile(
                          fileIndex: 'documents[]',
                          allowedExtensions: DocumentEntity.ALLOWED_EXTENSIONS);
                      onUploadDocument(multipartFile);
                    },
                  ),
                ),
              ],
            ),
          )
        else
          Padding(
            padding: EdgeInsets.symmetric(vertical: 30),
            child: Center(
              child: Text(
                localization.requiresAnEnterprisePlan,
                style: TextStyle(fontSize: 18, color: Colors.grey),
              ),
            ),
          ),
        ListDivider(),
        LayoutBuilder(builder: (context, constraints) {
          return GridView.count(
            physics: NeverScrollableScrollPhysics(),
            padding: EdgeInsets.all(6),
            childAspectRatio: ((constraints.maxWidth / 2) - 8) / 200,
            shrinkWrap: true,
            primary: true,
            crossAxisCount: 2,
            children: documents
                .map((document) => DocumentTile(
                      document: document,
                      onDeleteDocument: onDeleteDocument,
                      onViewExpense: onViewExpense,
                      isFromExpense: false,
                    ))
                .toList(),
          );
        }),
      ],
    );
  }
}

class DocumentTile extends StatelessWidget {
  const DocumentTile({
    @required this.document,
    @required this.onDeleteDocument,
    @required this.onViewExpense,
    @required this.isFromExpense,
  });

  final DocumentEntity document;
  final Function(DocumentEntity, String, String) onDeleteDocument;
  final Function(DocumentEntity) onViewExpense;
  final bool isFromExpense;

  void showDocumentModal(BuildContext context) {
    showDialog<Column>(
        context: context,
        builder: (BuildContext context) {
          final localization = AppLocalization.of(context);

          return AlertDialog(
            title: Text(document.name),
            actions: [
              isFromExpense && onViewExpense != null
                  ? TextButton(
                      child: Text(localization.expense.toUpperCase()),
                      onPressed: () {
                        Navigator.of(context).pop();
                        onViewExpense(document);
                      },
                    )
                  : TextButton(
                      child: Text(localization.delete.toUpperCase()),
                      onPressed: () {
                        confirmCallback(
                            context: context,
                            callback: () {
                              passwordCallback(
                                  context: context,
                                  callback: (password, idToken) {
                                    onDeleteDocument(
                                        document, password, idToken);
                                    Navigator.pop(context);
                                  });
                            });
                      },
                    ),
              TextButton(
                child: Text(localization.download.toUpperCase()),
                onPressed: () async {
                  final store = StoreProvider.of<AppState>(context);
                  final state = store.state;
                  if (kIsWeb || (!Platform.isIOS && !Platform.isAndroid)) {
                    launch(state.account.defaultUrl + document.downloadUrl);
                  } else {
                    Directory directory;
                    if (Platform.isAndroid) {
                      directory = await getExternalStorageDirectory();
                    } else {
                      directory = await getApplicationDocumentsDirectory();
                    }

                    final String folder = '${directory.path}/documents';
                    await Directory(folder).create(recursive: true);
                    final filePath = '$folder/${document.name}';

                    final http.Response response = await WebClient().get(
                        document.url, state.credentials.token,
                        rawResponse: true);

                    await File(filePath).writeAsBytes(response.bodyBytes);
                    await FlutterShare.shareFile(
                      title: '${localization.name}',
                      filePath: filePath,
                    );
                  }
                },
              ),
              TextButton(
                child: Text(localization.close.toUpperCase()),
                onPressed: () {
                  Navigator.of(context).pop();
                },
              ),
            ],
          );
        });
  }

  @override
  Widget build(BuildContext context) {
    return Column(
      mainAxisSize: MainAxisSize.max,
      children: <Widget>[
        InkWell(
          onTap: () => showDocumentModal(context),
          child: Padding(
            padding: const EdgeInsets.all(4),
            child: Card(
              elevation: 4,
              child: Column(
                crossAxisAlignment: CrossAxisAlignment.start,
                children: <Widget>[
                  DocumentPreview(
                    document,
                    height: 120,
                  ),
                  Padding(
                    padding: const EdgeInsets.all(4),
                    child: Column(
                      crossAxisAlignment: CrossAxisAlignment.start,
                      children: <Widget>[
                        Text(
                          document.name ?? '',
                          style: Theme.of(context).textTheme.headline6,
                          overflow: TextOverflow.ellipsis,
                          maxLines: 1,
                        ),
                        Text(
                          '${formatDate(convertTimestampToDateString(document.createdAt), context)} • ${document.prettySize}',
                          style: Theme.of(context).textTheme.caption,
                          overflow: TextOverflow.ellipsis,
                          maxLines: 1,
                        ),
                      ],
                    ),
                  )
                ],
              ),
            ),
          ),
        ),
      ],
    );
  }
}

class DocumentPreview extends StatelessWidget {
  const DocumentPreview(this.document, {this.height});

  final DocumentEntity document;
  final double height;

  @override
  Widget build(BuildContext context) {
    final state = StoreProvider.of<AppState>(context).state;

    if (['png', 'jpg', 'jpeg'].contains(document.type)) {
      return CachedNetworkImage(
          height: height,
          width: double.infinity,
          fit: BoxFit.cover,
          key: ValueKey(document.preview),
          imageUrl: document.url,
          imageRenderMethodForWeb: ImageRenderMethodForWeb.HttpGet,
          httpHeaders: {'X-API-TOKEN': state.credentials.token},
          placeholder: (context, url) => Container(
                height: height,
                child: Center(
                  child: CircularProgressIndicator(),
                ),
              ),
          errorWidget: (context, url, Object error) => Text(
                '$error: $url',
                maxLines: 6,
                overflow: TextOverflow.ellipsis,
              ));
    }

    return SizedBox(
      height: height,
      width: double.infinity,
      child: Icon(getFileTypeIcon(document.type), size: 40),
    );
  }
}