import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:obtainium/components/custom_app_bar.dart';
import 'package:obtainium/components/generated_form.dart';
import 'package:obtainium/custom_errors.dart';
import 'package:obtainium/pages/app.dart';
import 'package:obtainium/providers/apps_provider.dart';
import 'package:obtainium/providers/settings_provider.dart';
import 'package:obtainium/providers/source_provider.dart';
import 'package:provider/provider.dart';
import 'package:url_launcher/url_launcher_string.dart';

class AddAppPage extends StatefulWidget {
  const AddAppPage({super.key});

  @override
  State<AddAppPage> createState() => _AddAppPageState();
}

class _AddAppPageState extends State<AddAppPage> {
  bool gettingAppInfo = false;

  String userInput = '';
  AppSource? pickedSource;
  List<String> additionalData = [];
  bool validAdditionalData = true;

  @override
  Widget build(BuildContext context) {
    SourceProvider sourceProvider = SourceProvider();
    return Scaffold(
        backgroundColor: Theme.of(context).colorScheme.surface,
        body: CustomScrollView(slivers: <Widget>[
          const CustomAppBar(title: 'Add App'),
          SliverFillRemaining(
            child: Padding(
                padding: const EdgeInsets.all(16),
                child: Column(
                    crossAxisAlignment: CrossAxisAlignment.stretch,
                    children: [
                      Row(
                        children: [
                          Expanded(
                              child: GeneratedForm(
                                  items: [
                                    [
                                      GeneratedFormItem(
                                          label: 'App Source Url',
                                          additionalValidators: [
                                            (value) {
                                              try {
                                                sourceProvider
                                                    .getSource(value ?? '')
                                                    .standardizeURL(
                                                        preStandardizeUrl(
                                                            value ?? ''));
                                              } catch (e) {
                                                return e is String
                                                    ? e
                                                    : e is ObtainiumError
                                                        ? e.toString()
                                                        : 'Error';
                                              }
                                              return null;
                                            }
                                          ])
                                    ]
                                  ],
                                  onValueChanges: (values, valid) {
                                    setState(() {
                                      userInput = values[0];
                                      var source = valid
                                          ? sourceProvider.getSource(userInput)
                                          : null;
                                      if (pickedSource != source) {
                                        pickedSource = source;
                                        additionalData = source != null
                                            ? source.additionalDataDefaults
                                            : [];
                                        validAdditionalData = source != null
                                            ? sourceProvider
                                                .ifSourceAppsRequireAdditionalData(
                                                    source)
                                            : true;
                                      }
                                    });
                                  },
                                  defaultValues: const [])),
                          const SizedBox(
                            width: 16,
                          ),
                          gettingAppInfo
                              ? const CircularProgressIndicator()
                              : ElevatedButton(
                                  onPressed: gettingAppInfo ||
                                          pickedSource == null ||
                                          (pickedSource!.additionalDataFormItems
                                                  .isNotEmpty &&
                                              !validAdditionalData)
                                      ? null
                                      : () async {
                                          setState(() {
                                            gettingAppInfo = true;
                                          });
                                          var appsProvider =
                                              context.read<AppsProvider>();
                                          var settingsProvider =
                                              context.read<SettingsProvider>();
                                          () async {
                                            HapticFeedback.selectionClick();
                                            App app =
                                                await sourceProvider.getApp(
                                                    pickedSource!,
                                                    userInput,
                                                    additionalData);
                                            await settingsProvider
                                                .getInstallPermission();
                                            // Only download the APK here if you need to for the package ID
                                            if (sourceProvider
                                                .isTempId(app.id)) {
                                              // ignore: use_build_context_synchronously
                                              var apkUrl = await appsProvider
                                                  .confirmApkUrl(app, context);
                                              if (apkUrl == null) {
                                                throw ObtainiumError(
                                                    'Cancelled');
                                              }
                                              app.preferredApkIndex =
                                                  app.apkUrls.indexOf(apkUrl);
                                              var downloadedApk =
                                                  await appsProvider
                                                      .downloadApp(app);
                                              app.id = downloadedApk.appId;
                                            }
                                            if (appsProvider.apps
                                                .containsKey(app.id)) {
                                              throw ObtainiumError(
                                                  'App already added');
                                            }
                                            await appsProvider.saveApps([app]);

                                            return app;
                                          }()
                                              .then((app) {
                                            Navigator.push(
                                                context,
                                                MaterialPageRoute(
                                                    builder: (context) =>
                                                        AppPage(
                                                            appId: app.id)));
                                          }).catchError((e) {
                                            showError(e, context);
                                          }).whenComplete(() {
                                            setState(() {
                                              gettingAppInfo = false;
                                            });
                                          });
                                        },
                                  child: const Text('Add'))
                        ],
                      ),
                      if (pickedSource != null &&
                          pickedSource!.additionalDataDefaults.isNotEmpty)
                        Column(
                          crossAxisAlignment: CrossAxisAlignment.stretch,
                          children: [
                            const Divider(
                              height: 64,
                            ),
                            Text(
                                'Additional Options for ${pickedSource?.runtimeType}',
                                style: TextStyle(
                                    color:
                                        Theme.of(context).colorScheme.primary)),
                            const SizedBox(
                              height: 16,
                            ),
                            if (pickedSource!
                                .additionalDataFormItems.isNotEmpty)
                              GeneratedForm(
                                  items: pickedSource!.additionalDataFormItems,
                                  onValueChanges: (values, valid) {
                                    setState(() {
                                      additionalData = values;
                                      validAdditionalData = valid;
                                    });
                                  },
                                  defaultValues:
                                      pickedSource!.additionalDataDefaults),
                            if (pickedSource!
                                .additionalDataFormItems.isNotEmpty)
                              const SizedBox(
                                height: 8,
                              ),
                          ],
                        )
                      else
                        Expanded(
                            child: Column(
                                crossAxisAlignment: CrossAxisAlignment.center,
                                mainAxisAlignment: MainAxisAlignment.center,
                                children: [
                              const Text(
                                'Supported Sources:',
                              ),
                              const SizedBox(
                                height: 8,
                              ),
                              ...sourceProvider
                                  .getSourceHosts()
                                  .map((e) => GestureDetector(
                                      onTap: () {
                                        launchUrlString('https://$e',
                                            mode:
                                                LaunchMode.externalApplication);
                                      },
                                      child: Text(
                                        e,
                                        style: const TextStyle(
                                            decoration:
                                                TextDecoration.underline,
                                            fontStyle: FontStyle.italic),
                                      )))
                                  .toList()
                            ])),
                    ])),
          )
        ]));
  }
}