import 'dart:convert';

import 'package:flutter/material.dart';
import 'package:sliver_tools/sliver_tools.dart';
import 'package:venera/components/components.dart';
import 'package:venera/foundation/app.dart';
import 'package:venera/foundation/appdata.dart';
import 'package:venera/foundation/comic_source/comic_source.dart';
import 'package:venera/foundation/state_controller.dart';
import 'package:venera/pages/aggregated_search_page.dart';
import 'package:venera/pages/search_result_page.dart';
import 'package:venera/utils/app_links.dart';
import 'package:venera/utils/ext.dart';
import 'package:venera/utils/tags_translation.dart';
import 'package:venera/utils/translations.dart';

import 'comic_page.dart';

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

  @override
  State<SearchPage> createState() => _SearchPageState();
}

class _SearchPageState extends State<SearchPage> {
  late final SearchBarController controller;

  String searchTarget = "";

  bool aggregatedSearch = false;

  var focusNode = FocusNode();

  var options = <String>[];

  void update() {
    setState(() {});
  }

  void search([String? text]) {
    if (aggregatedSearch) {
      context
          .to(() => AggregatedSearchPage(keyword: text ?? controller.text))
          .then((_) => update());
    } else {
      context
          .to(
            () => SearchResultPage(
              text: text ?? controller.text,
              sourceKey: searchTarget,
              options: options,
            ),
          )
          .then((_) => update());
    }
  }

  var suggestions = <Pair<String, TranslationType>>[];

  bool canHandleUrl(String text) {
    if (!text.isURL) return false;
    for (var source in ComicSource.all()) {
      if (source.linkHandler != null) {
        var uri = Uri.parse(text);
        if (source.linkHandler!.domains.contains(uri.host)) {
          return true;
        }
      }
    }
    return false;
  }

  void findSuggestions() {
    var text = controller.text.split(" ").last;
    var suggestions = this.suggestions;

    suggestions.clear();

    if (canHandleUrl(controller.text)) {
      suggestions.add(Pair("**URL**", TranslationType.other));
    } else {
      var text = controller.text;

      for (var comicSource in ComicSource.all()) {
        if (comicSource.idMatcher?.hasMatch(text) ?? false) {
          suggestions.add(Pair(
            "**${comicSource.key}**",
            TranslationType.other,
          ));
        }
      }
    }

    if (!ComicSource.find(searchTarget)!.enableTagsSuggestions) {
      update();
      return;
    }

    bool check(String text, String key, String value) {
      if (text.removeAllBlank == "") {
        return false;
      }
      if (key.length >= text.length && key.substring(0, text.length) == text ||
          (key.contains(" ") &&
              key.split(" ").last.length >= text.length &&
              key.split(" ").last.substring(0, text.length) == text)) {
        return true;
      } else if (value.length >= text.length && value.contains(text)) {
        return true;
      }
      return false;
    }

    void find(Map<String, String> map, TranslationType type) {
      for (var element in map.entries) {
        if (suggestions.length > 100) {
          break;
        }
        if (check(text, element.key, element.value)) {
          suggestions.add(Pair(element.key, type));
        }
      }
    }

    find(TagsTranslation.femaleTags, TranslationType.female);
    find(TagsTranslation.maleTags, TranslationType.male);
    find(TagsTranslation.parodyTags, TranslationType.parody);
    find(TagsTranslation.characterTranslations, TranslationType.character);
    find(TagsTranslation.otherTags, TranslationType.other);
    find(TagsTranslation.mixedTags, TranslationType.mixed);
    find(TagsTranslation.languageTranslations, TranslationType.language);
    find(TagsTranslation.artistTags, TranslationType.artist);
    find(TagsTranslation.groupTags, TranslationType.group);
    find(TagsTranslation.cosplayerTags, TranslationType.cosplayer);
    update();
  }

  @override
  void initState() {
    var defaultSearchTarget = appdata.settings['defaultSearchTarget'];
    if (defaultSearchTarget == "_aggregated_") {
      aggregatedSearch = true;
    } else if (defaultSearchTarget != null &&
        ComicSource.find(defaultSearchTarget) != null) {
      searchTarget = defaultSearchTarget;
    } else {
      searchTarget = ComicSource.all().first.key;
    }
    controller = SearchBarController(
      onSearch: search,
    );
    super.initState();
  }

  @override
  void dispose() {
    focusNode.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: SmoothCustomScrollView(
        slivers: buildSlivers().toList(),
      ),
    );
  }

  Iterable<Widget> buildSlivers() sync* {
    yield SliverSearchBar(
      controller: controller,
      onChanged: (s) {
        findSuggestions();
      },
      focusNode: focusNode,
    );
    if (suggestions.isNotEmpty) {
      yield buildSuggestions(context);
    } else {
      yield buildSearchTarget();
      yield SliverAnimatedPaintExtent(
        duration: const Duration(milliseconds: 200),
        child: buildSearchOptions(),
      );
      yield buildSearchHistory();
    }
  }

  Widget buildSearchTarget() {
    var sources =
        ComicSource.all().where((e) => e.searchPageData != null).toList();
    return SliverToBoxAdapter(
      child: Container(
        width: double.infinity,
        padding: const EdgeInsets.symmetric(horizontal: 16),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            ListTile(
              contentPadding: EdgeInsets.zero,
              leading: const Icon(Icons.search),
              title: Text("Search in".tl),
            ),
            Wrap(
              spacing: 8,
              runSpacing: 8,
              children: sources.map((e) {
                return OptionChip(
                  text: e.name,
                  isSelected: searchTarget == e.key || aggregatedSearch,
                  onTap: () {
                    if (aggregatedSearch) return;
                    setState(() {
                      searchTarget = e.key;
                      useDefaultOptions();
                    });
                  },
                );
              }).toList(),
            ),
            ListTile(
              contentPadding: EdgeInsets.zero,
              title: Text("Aggregated Search".tl),
              leading: Checkbox(
                value: aggregatedSearch,
                onChanged: (value) {
                  setState(() {
                    aggregatedSearch = value ?? false;
                  });
                },
              ),
            ),
          ],
        ),
      ),
    );
  }

  void useDefaultOptions() {
    final searchOptions =
        ComicSource.find(searchTarget)!.searchPageData!.searchOptions ??
            <SearchOptions>[];
    options = searchOptions.map((e) => e.defaultValue).toList();
  }

  Widget buildSearchOptions() {
    if (aggregatedSearch) {
      return const SliverToBoxAdapter(child: SizedBox());
    }

    var children = <Widget>[];

    final searchOptions =
        ComicSource.find(searchTarget)!.searchPageData!.searchOptions ??
            <SearchOptions>[];
    if (searchOptions.length != options.length) {
      useDefaultOptions();
    }
    if (searchOptions.isEmpty) {
      return const SliverToBoxAdapter(child: SizedBox());
    }
    for (int i = 0; i < searchOptions.length; i++) {
      final option = searchOptions[i];
      children.add(SearchOptionWidget(
        option: option,
        value: options[i],
        onChanged: (value) {
          options[i] = value;
          update();
        },
        sourceKey: searchTarget,
      ));
    }

    return SliverToBoxAdapter(
      child: Container(
        width: double.infinity,
        padding: const EdgeInsets.symmetric(horizontal: 16),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: children,
        ),
      ),
    );
  }

  Widget buildSearchHistory() {
    return SliverList(
      delegate: SliverChildBuilderDelegate(
        (context, index) {
          if (index == 0) {
            return const SizedBox(
              height: 16,
            );
          }
          if (index == 1) {
            return ListTile(
              leading: const Icon(Icons.history),
              contentPadding: EdgeInsets.zero,
              title: Text("Search History".tl),
              trailing: Flyout(
                flyoutBuilder: (context) {
                  return FlyoutContent(
                    title: "Clear Search History".tl,
                    actions: [
                      FilledButton(
                        child: Text("Clear".tl),
                        onPressed: () {
                          appdata.clearSearchHistory();
                          context.pop();
                          update();
                        },
                      )
                    ],
                  );
                },
                child: Builder(
                  builder: (context) {
                    return Tooltip(
                      message: "Clear".tl,
                      child: IconButton(
                        icon: const Icon(Icons.clear_all),
                        onPressed: () {
                          context
                              .findAncestorStateOfType<FlyoutState>()!
                              .show();
                        },
                      ),
                    );
                  },
                ),
              ),
            );
          }
          return InkWell(
            onTap: () {
              search(appdata.searchHistory[index - 2]);
            },
            child: Container(
              decoration: BoxDecoration(
                // color: context.colorScheme.surfaceContainer,
                border: Border(
                  left: BorderSide(
                    color: context.colorScheme.outlineVariant,
                    width: 2,
                  ),
                ),
              ),
              padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 8),
              child: Text(appdata.searchHistory[index - 2], style: ts.s14),
            ),
          ).paddingBottom(8).paddingHorizontal(4);
        },
        childCount: 2 + appdata.searchHistory.length,
      ),
    ).sliverPaddingHorizontal(16);
  }

  Widget buildSuggestions(BuildContext context) {
    bool check(String text, String key, String value) {
      if (text.removeAllBlank == "") {
        return false;
      }
      if (key.length >= text.length && key.substring(0, text.length) == text ||
          (key.contains(" ") &&
              key.split(" ").last.length >= text.length &&
              key.split(" ").last.substring(0, text.length) == text)) {
        return true;
      } else if (value.length >= text.length && value.contains(text)) {
        return true;
      }
      return false;
    }

    void onSelected(String text, TranslationType? type) {
      var words = controller.text.split(" ");
      if (words.length >= 2 &&
          check("${words[words.length - 2]} ${words[words.length - 1]}", text,
              text.translateTagsToCN)) {
        controller.text = controller.text.replaceLast(
            "${words[words.length - 2]} ${words[words.length - 1]}", "");
      } else {
        controller.text =
            controller.text.replaceLast(words[words.length - 1], "");
      }
      if (type != null) {
        controller.text += "${type.name}:$text ";
      } else {
        controller.text += "$text ";
      }
      suggestions.clear();
      update();
      focusNode.requestFocus();
    }

    bool showMethod = MediaQuery.of(context).size.width < 600;
    bool showTranslation = App.locale.languageCode == "zh";
    Widget buildItem(Pair<String, TranslationType> value) {
      if (value.left == "**URL**") {
        return ListTile(
          leading: const Icon(Icons.link),
          title: Text("Open link".tl),
          subtitle: Text(
            controller.text,
            maxLines: 1,
            overflow: TextOverflow.fade,
          ),
          trailing: const Icon(Icons.arrow_right),
          onTap: () {
            setState(() {
              suggestions.clear();
            });
            handleAppLink(Uri.parse(controller.text));
          },
        );
      }

      if (RegExp(r"^\*\*.*\*\*$").hasMatch(value.left)) {
        var key = value.left.substring(2, value.left.length - 2);
        var comicSource = ComicSource.find(key);
        if (comicSource == null) {
          return const SizedBox();
        }
        return ListTile(
          leading: const Icon(Icons.link),
          title: Text("${"Open comic".tl}: ${comicSource.name}"),
          subtitle: Text(
            controller.text,
            maxLines: 1,
            overflow: TextOverflow.fade,
          ),
          trailing: const Icon(Icons.arrow_right),
          onTap: () {
            context.to(
              () => ComicPage(
                sourceKey: key,
                id: controller.text,
              ),
            );
          },
        );
      }

      var subTitle = TagsTranslation.translationTagWithNamespace(
          value.left, value.right.name);
      return ListTile(
        title: Row(
          mainAxisSize: MainAxisSize.min,
          children: [
            Expanded(
              child: Text(value.left),
            ),
            if (!showMethod)
              const SizedBox(
                width: 12,
              ),
            if (!showMethod && showTranslation)
              Text(
                subTitle,
                style: TextStyle(
                    fontSize: 14, color: Theme.of(context).colorScheme.outline),
              )
          ],
        ),
        subtitle: (showMethod && showTranslation) ? Text(subTitle) : null,
        trailing: Text(
          value.right.name,
          style: const TextStyle(fontSize: 13),
        ),
        onTap: () => onSelected(value.left, value.right),
      );
    }

    return SliverMainAxisGroup(
      slivers: [
        SliverToBoxAdapter(
          child: ListTile(
            leading: const Icon(Icons.hub_outlined),
            title: Text("Suggestions".tl),
            trailing: Tooltip(
              message: "Clear".tl,
              child: IconButton(
                icon: const Icon(Icons.clear_all),
                onPressed: () {
                  suggestions.clear();
                  update();
                },
              ),
            ),
          ),
        ),
        SliverList(
          delegate: SliverChildBuilderDelegate(
            (context, index) {
              return buildItem(suggestions[index]);
            },
            childCount: suggestions.length,
          ),
        ),
      ],
    );
  }
}

class SearchOptionWidget extends StatelessWidget {
  const SearchOptionWidget({
    super.key,
    required this.option,
    required this.value,
    required this.onChanged,
    required this.sourceKey,
  });

  final SearchOptions option;

  final String value;

  final void Function(String) onChanged;

  final String sourceKey;

  @override
  Widget build(BuildContext context) {
    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        ListTile(
          contentPadding: EdgeInsets.zero,
          title: Text(option.label.ts(sourceKey)),
        ),
        if (option.type == 'select')
          Wrap(
            runSpacing: 8,
            spacing: 8,
            children: option.options.entries.map((e) {
              return OptionChip(
                text: e.value.ts(sourceKey),
                isSelected: value == e.key,
                onTap: () {
                  onChanged(e.key);
                },
              );
            }).toList(),
          ),
        if (option.type == 'multi-select')
          Wrap(
            runSpacing: 8,
            spacing: 8,
            children: option.options.entries.map((e) {
              return OptionChip(
                text: e.value.ts(sourceKey),
                isSelected: (jsonDecode(value) as List).contains(e.key),
                onTap: () {
                  var list = jsonDecode(value) as List;
                  if (list.contains(e.key)) {
                    list.remove(e.key);
                  } else {
                    list.add(e.key);
                  }
                  onChanged(jsonEncode(list));
                },
              );
            }).toList(),
          ),
        if (option.type == 'dropdown')
          Select(
            current: option.options[value],
            values: option.options.values.toList(),
            onTap: (index) {
              onChanged(option.options.keys.elementAt(index));
            },
            minWidth: 96,
          )
      ],
    );
  }
}