import 'package:easy_localization/easy_localization.dart';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:obtainium/app_sources/html.dart';
import 'package:obtainium/components/custom_app_bar.dart';
import 'package:obtainium/components/generated_form.dart';
import 'package:obtainium/components/generated_form_modal.dart';
import 'package:obtainium/custom_errors.dart';
import 'package:obtainium/main.dart';
import 'package:obtainium/pages/app.dart';
import 'package:obtainium/pages/import_export.dart';
import 'package:obtainium/pages/settings.dart';
import 'package:obtainium/providers/apps_provider.dart';
import 'package:obtainium/providers/notifications_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;
  bool searching = false;

  String userInput = '';
  String searchQuery = '';
  String? pickedSourceOverride;
  AppSource? pickedSource;
  Map<String, dynamic> additionalSettings = {};
  bool additionalSettingsValid = true;
  bool inferAppIdIfOptional = true;
  List<String> pickedCategories = [];
  int urlInputKey = 0;
  SourceProvider sourceProvider = SourceProvider();

  linkFn(String input) {
    try {
      if (input.isEmpty) {
        throw UnsupportedURLError();
      }
      sourceProvider.getSource(input);
      changeUserInput(input, true, false, updateUrlInput: true);
    } catch (e) {
      showError(e, context);
    }
  }

  changeUserInput(String input, bool valid, bool isBuilding,
      {bool updateUrlInput = false}) {
    userInput = input;
    if (!isBuilding) {
      setState(() {
        if (updateUrlInput) {
          urlInputKey++;
        }
        var prevHost = pickedSource?.hosts.isNotEmpty == true
            ? pickedSource?.hosts[0]
            : null;
        try {
          var naturalSource =
              valid ? sourceProvider.getSource(userInput) : null;
          if (naturalSource != null &&
              naturalSource.runtimeType.toString() !=
                  HTML().runtimeType.toString()) {
            // If input has changed to match a regular source, reset the override
            pickedSourceOverride = null;
          }
        } catch (e) {
          // ignore
        }
        var source = valid
            ? sourceProvider.getSource(userInput,
                overrideSource: pickedSourceOverride)
            : null;
        if (pickedSource.runtimeType != source.runtimeType ||
            (prevHost != null && prevHost != source?.hosts[0])) {
          pickedSource = source;
          additionalSettings = source != null
              ? getDefaultValuesFromFormItems(
                  source.combinedAppSpecificSettingFormItems)
              : {};
          additionalSettingsValid = source != null
              ? !sourceProvider.ifRequiredAppSpecificSettingsExist(source)
              : true;
          inferAppIdIfOptional = true;
        }
      });
    }
  }

  @override
  Widget build(BuildContext context) {
    AppsProvider appsProvider = context.read<AppsProvider>();
    SettingsProvider settingsProvider = context.watch<SettingsProvider>();
    NotificationsProvider notificationsProvider =
        context.read<NotificationsProvider>();

    bool doingSomething = gettingAppInfo || searching;

    Future<bool> getTrackOnlyConfirmationIfNeeded(bool userPickedTrackOnly,
        {bool ignoreHideSetting = false}) async {
      var useTrackOnly = userPickedTrackOnly || pickedSource!.enforceTrackOnly;
      if (useTrackOnly &&
          (!settingsProvider.hideTrackOnlyWarning || ignoreHideSetting)) {
        // ignore: use_build_context_synchronously
        var values = await showDialog(
            context: context,
            builder: (BuildContext ctx) {
              return GeneratedFormModal(
                initValid: true,
                title: tr('xIsTrackOnly', args: [
                  pickedSource!.enforceTrackOnly ? tr('source') : tr('app')
                ]),
                items: [
                  [GeneratedFormSwitch('hide', label: tr('dontShowAgain'))]
                ],
                message:
                    '${pickedSource!.enforceTrackOnly ? tr('appsFromSourceAreTrackOnly') : tr('youPickedTrackOnly')}\n\n${tr('trackOnlyAppDescription')}',
              );
            });
        if (values != null) {
          settingsProvider.hideTrackOnlyWarning = values['hide'] == true;
        }
        return useTrackOnly && values != null;
      } else {
        return true;
      }
    }

    getReleaseDateAsVersionConfirmationIfNeeded(
        bool userPickedTrackOnly) async {
      return (!(additionalSettings['releaseDateAsVersion'] == true &&
          // ignore: use_build_context_synchronously
          await showDialog(
                  context: context,
                  builder: (BuildContext ctx) {
                    return GeneratedFormModal(
                      title: tr('releaseDateAsVersion'),
                      items: const [],
                      message: tr('releaseDateAsVersionExplanation'),
                    );
                  }) ==
              null));
    }

    addApp({bool resetUserInputAfter = false}) async {
      setState(() {
        gettingAppInfo = true;
      });
      try {
        var userPickedTrackOnly = additionalSettings['trackOnly'] == true;
        App? app;
        if ((await getTrackOnlyConfirmationIfNeeded(userPickedTrackOnly)) &&
            (await getReleaseDateAsVersionConfirmationIfNeeded(
                userPickedTrackOnly))) {
          var trackOnly = pickedSource!.enforceTrackOnly || userPickedTrackOnly;
          app = await sourceProvider.getApp(
              pickedSource!, userInput.trim(), additionalSettings,
              trackOnlyOverride: trackOnly,
              sourceIsOverriden: pickedSourceOverride != null,
              inferAppIdIfOptional: inferAppIdIfOptional);
          // Only download the APK here if you need to for the package ID
          if (isTempId(app) && app.additionalSettings['trackOnly'] != true) {
            // ignore: use_build_context_synchronously
            var apkUrl = await appsProvider.confirmApkUrl(app, context);
            if (apkUrl == null) {
              throw ObtainiumError(tr('cancelled'));
            }
            app.preferredApkIndex =
                app.apkUrls.map((e) => e.value).toList().indexOf(apkUrl.value);
            // ignore: use_build_context_synchronously
            var downloadedArtifact = await appsProvider.downloadApp(
                app, globalNavigatorKey.currentContext,
                notificationsProvider: notificationsProvider);
            DownloadedApk? downloadedFile;
            DownloadedXApkDir? downloadedDir;
            if (downloadedArtifact is DownloadedApk) {
              downloadedFile = downloadedArtifact;
            } else {
              downloadedDir = downloadedArtifact as DownloadedXApkDir;
            }
            app.id = downloadedFile?.appId ?? downloadedDir!.appId;
          }
          if (appsProvider.apps.containsKey(app.id)) {
            throw ObtainiumError(tr('appAlreadyAdded'));
          }
          if (app.additionalSettings['trackOnly'] == true ||
              app.additionalSettings['versionDetection'] != true) {
            app.installedVersion = app.latestVersion;
          }
          app.categories = pickedCategories;
          await appsProvider.saveApps([app], onlyIfExists: false);
        }
        if (app != null) {
          Navigator.push(globalNavigatorKey.currentContext ?? context,
              MaterialPageRoute(builder: (context) => AppPage(appId: app!.id)));
        }
      } catch (e) {
        showError(e, context);
      } finally {
        setState(() {
          gettingAppInfo = false;
          if (resetUserInputAfter) {
            changeUserInput('', false, true);
          }
        });
      }
    }

    Widget getUrlInputRow() => Row(
          children: [
            Expanded(
                child: GeneratedForm(
                    key: Key(urlInputKey.toString()),
                    items: [
                      [
                        GeneratedFormTextField('appSourceURL',
                            label: tr('appSourceURL'),
                            defaultValue: userInput,
                            additionalValidators: [
                              (value) {
                                try {
                                  sourceProvider
                                      .getSource(value ?? '',
                                          overrideSource: pickedSourceOverride)
                                      .standardizeUrl(value ?? '');
                                } catch (e) {
                                  return e is String
                                      ? e
                                      : e is ObtainiumError
                                          ? e.toString()
                                          : tr('error');
                                }
                                return null;
                              }
                            ])
                      ]
                    ],
                    onValueChanges: (values, valid, isBuilding) {
                      changeUserInput(
                          values['appSourceURL']!, valid, isBuilding);
                    })),
            const SizedBox(
              width: 16,
            ),
            gettingAppInfo
                ? const CircularProgressIndicator()
                : ElevatedButton(
                    onPressed: doingSomething ||
                            pickedSource == null ||
                            (pickedSource!.combinedAppSpecificSettingFormItems
                                    .isNotEmpty &&
                                !additionalSettingsValid)
                        ? null
                        : () {
                            HapticFeedback.selectionClick();
                            addApp();
                          },
                    child: Text(tr('add')))
          ],
        );

    runSearch({bool filtered = true}) async {
      setState(() {
        searching = true;
      });
      var sourceStrings = <String, List<String>>{};
      sourceProvider.sources
          .where((e) => e.canSearch && !e.excludeFromMassSearch)
          .forEach((s) {
        sourceStrings[s.name] = [s.name];
      });
      try {
        var searchSources = await showDialog<List<String>?>(
                context: context,
                builder: (BuildContext ctx) {
                  return SelectionModal(
                    title: tr('selectX', args: [plural('source', 2)]),
                    entries: sourceStrings,
                    selectedByDefault: true,
                    onlyOneSelectionAllowed: false,
                    titlesAreLinks: false,
                    deselectThese: settingsProvider.searchDeselected,
                  );
                }) ??
            [];
        if (searchSources.isNotEmpty) {
          settingsProvider.searchDeselected = sourceStrings.keys
              .where((s) => !searchSources.contains(s))
              .toList();
          var results = await Future.wait(sourceProvider.sources
              .where((e) => searchSources.contains(e.name))
              .map((e) async {
            try {
              return await e.search(searchQuery);
            } catch (err) {
              if (err is! CredsNeededError) {
                rethrow;
              } else {
                err.unexpected = true;
                showError(err, context);
                return <String, List<String>>{};
              }
            }
          }));

          // Interleave results instead of simple reduce
          Map<String, List<String>> res = {};
          var si = 0;
          var done = false;
          while (!done) {
            done = true;
            for (var r in results) {
              if (r.length > si) {
                done = false;
                res.addEntries([r.entries.elementAt(si)]);
              }
            }
            si++;
          }
          if (res.isEmpty) {
            throw ObtainiumError(tr('noResults'));
          }
          List<String>? selectedUrls = res.isEmpty
              ? []
              // ignore: use_build_context_synchronously
              : await showDialog<List<String>?>(
                  context: context,
                  builder: (BuildContext ctx) {
                    return SelectionModal(
                      entries: res,
                      selectedByDefault: false,
                      onlyOneSelectionAllowed: true,
                    );
                  });
          if (selectedUrls != null && selectedUrls.isNotEmpty) {
            changeUserInput(selectedUrls[0], true, false, updateUrlInput: true);
          }
        }
      } catch (e) {
        showError(e, context);
      } finally {
        setState(() {
          searching = false;
        });
      }
    }

    Widget getHTMLSourceOverrideDropdown() => Column(children: [
          Row(
            children: [
              Expanded(
                  child: GeneratedForm(
                items: [
                  [
                    GeneratedFormDropdown(
                        'overrideSource',
                        defaultValue: HTML().runtimeType.toString(),
                        [
                          ...sourceProvider.sources.map(
                              (s) => MapEntry(s.runtimeType.toString(), s.name))
                        ],
                        label: tr('overrideSource'))
                  ]
                ],
                onValueChanges: (values, valid, isBuilding) {
                  fn() {
                    pickedSourceOverride = (values['overrideSource'] == null ||
                            values['overrideSource'] == '')
                        ? null
                        : values['overrideSource'];
                  }

                  if (!isBuilding) {
                    setState(() {
                      fn();
                    });
                  } else {
                    fn();
                  }
                  changeUserInput(userInput, valid, isBuilding);
                },
              ))
            ],
          ),
          const SizedBox(
            height: 16,
          )
        ]);

    bool shouldShowSearchBar() =>
        sourceProvider.sources.where((e) => e.canSearch).isNotEmpty &&
        pickedSource == null &&
        userInput.isEmpty;

    Widget getSearchBarRow() => Row(
          children: [
            Expanded(
              child: GeneratedForm(
                  items: [
                    [
                      GeneratedFormTextField('searchSomeSources',
                          label: tr('searchSomeSourcesLabel'), required: false),
                    ]
                  ],
                  onValueChanges: (values, valid, isBuilding) {
                    if (values.isNotEmpty && valid && !isBuilding) {
                      setState(() {
                        searchQuery = values['searchSomeSources']!.trim();
                      });
                    }
                  }),
            ),
            const SizedBox(
              width: 16,
            ),
            searching
                ? const CircularProgressIndicator()
                : ElevatedButton(
                    onPressed: searchQuery.isEmpty || doingSomething
                        ? null
                        : () {
                            runSearch();
                          },
                    child: Text(tr('search')))
          ],
        );

    Widget getAdditionalOptsCol() => Column(
          crossAxisAlignment: CrossAxisAlignment.stretch,
          children: [
            const SizedBox(
              height: 16,
            ),
            Text(
                tr('additionalOptsFor',
                    args: [pickedSource?.name ?? tr('source')]),
                style: TextStyle(
                    color: Theme.of(context).colorScheme.primary,
                    fontWeight: FontWeight.bold)),
            const SizedBox(
              height: 16,
            ),
            GeneratedForm(
                key: Key(pickedSource.runtimeType.toString()),
                items: [
                  ...pickedSource!.combinedAppSpecificSettingFormItems,
                  ...(pickedSourceOverride != null
                      ? pickedSource!.sourceConfigSettingFormItems
                          .map((e) => [e])
                      : [])
                ],
                onValueChanges: (values, valid, isBuilding) {
                  if (!isBuilding) {
                    setState(() {
                      additionalSettings = values;
                      additionalSettingsValid = valid;
                    });
                  }
                }),
            Column(
              children: [
                const SizedBox(
                  height: 16,
                ),
                CategoryEditorSelector(
                    alignment: WrapAlignment.start,
                    onSelected: (categories) {
                      pickedCategories = categories;
                    }),
              ],
            ),
            if (pickedSource != null && pickedSource!.appIdInferIsOptional)
              GeneratedForm(
                  key: const Key('inferAppIdIfOptional'),
                  items: [
                    [
                      GeneratedFormSwitch('inferAppIdIfOptional',
                          label: tr('tryInferAppIdFromCode'),
                          defaultValue: inferAppIdIfOptional)
                    ]
                  ],
                  onValueChanges: (values, valid, isBuilding) {
                    if (!isBuilding) {
                      setState(() {
                        inferAppIdIfOptional = values['inferAppIdIfOptional'];
                      });
                    }
                  }),
          ],
        );

    Widget getSourcesListWidget() => Padding(
          padding: const EdgeInsets.all(16),
          child: Row(
            children: [
              GestureDetector(
                  onTap: () {
                    showDialog(
                      context: context,
                      builder: (context) {
                        return GeneratedFormModal(
                          singleNullReturnButton: tr('ok'),
                          title: tr('supportedSources'),
                          items: const [],
                          additionalWidgets: [
                            ...sourceProvider.sources.map(
                              (e) => Padding(
                                  padding:
                                      const EdgeInsets.symmetric(vertical: 4),
                                  child: GestureDetector(
                                      onTap: e.hosts.isNotEmpty
                                          ? () {
                                              launchUrlString(
                                                  'https://${e.hosts[0]}',
                                                  mode: LaunchMode
                                                      .externalApplication);
                                            }
                                          : null,
                                      child: Text(
                                        '${e.name}${e.enforceTrackOnly ? ' ${tr('trackOnlyInBrackets')}' : ''}${e.canSearch ? ' ${tr('searchableInBrackets')}' : ''}',
                                        style: TextStyle(
                                            decoration: e.hosts.isNotEmpty
                                                ? TextDecoration.underline
                                                : TextDecoration.none),
                                      ))),
                            ),
                            const SizedBox(
                              height: 16,
                            ),
                            Text(
                              '${tr('note')}:',
                              style:
                                  const TextStyle(fontWeight: FontWeight.bold),
                            ),
                            const SizedBox(
                              height: 4,
                            ),
                            Text(tr('selfHostedNote',
                                args: [tr('overrideSource')])),
                          ],
                        );
                      },
                    );
                  },
                  child: Text(
                    tr('supportedSources'),
                    style: const TextStyle(
                        fontWeight: FontWeight.bold,
                        decoration: TextDecoration.underline,
                        fontStyle: FontStyle.italic),
                  ))
            ],
          ),
        );

    return Scaffold(
        backgroundColor: Theme.of(context).colorScheme.surface,
        bottomNavigationBar:
            pickedSource == null ? getSourcesListWidget() : null,
        body: CustomScrollView(shrinkWrap: true, slivers: <Widget>[
          CustomAppBar(title: tr('addApp')),
          SliverToBoxAdapter(
            child: Padding(
                padding: const EdgeInsets.all(16),
                child: Column(
                    mainAxisSize: MainAxisSize.min,
                    crossAxisAlignment: CrossAxisAlignment.stretch,
                    children: [
                      getUrlInputRow(),
                      const SizedBox(
                        height: 16,
                      ),
                      if (pickedSourceOverride != null ||
                          (pickedSource != null &&
                              pickedSource.runtimeType.toString() ==
                                  HTML().runtimeType.toString()))
                        getHTMLSourceOverrideDropdown(),
                      if (shouldShowSearchBar()) getSearchBarRow(),
                      if (pickedSource != null)
                        FutureBuilder(
                            builder: (ctx, val) {
                              return val.data != null && val.data!.isNotEmpty
                                  ? Text(
                                      val.data!,
                                      style:
                                          Theme.of(context).textTheme.bodySmall,
                                    )
                                  : const SizedBox();
                            },
                            future: pickedSource?.getSourceNote()),
                      if (pickedSource != null) getAdditionalOptsCol(),
                    ])),
          )
        ]));
  }
}