import 'dart:convert';
import 'dart:io';

import 'package:cwtch/themes/cwtch.dart';
import 'package:cwtch/themes/opaque.dart';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:provider/provider.dart';
import 'package:yaml/yaml.dart';
import 'package:path/path.dart' as path;

import '../main.dart';

Future<Map<String, Map<String, OpaqueThemeType>>> loadBuiltinThemes() async {
  final manifestJson = await rootBundle.loadString('AssetManifest.json');
  final themesList = json.decode(manifestJson).keys.where((String key) => key.startsWith('assets/themes'));

  Map<String, Map<String, OpaqueThemeType>> themes = Map();

  for (String themefile in themesList) {
    if (themefile.substring(themefile.length - 4) != ".yml") {
      continue;
    }

    try {
      var data = await loadAssetYamlTheme(themefile);

      if (data != null) {
        // remove "assets/themes" and "theme.yml" from name
        var themename = themefile.substring(14, themefile.lastIndexOf("/"));
        themes[themename] = data;
      }
    } catch (e) {
      print("Failed to load theme: $themefile with exception: $e");
    }
  }
  return themes;
}

Future<Map<String, Map<String, OpaqueThemeType>>> loadCustomThemes(String themesDirPath) async {
  Map<String, Map<String, OpaqueThemeType>> themes = Map();

  Directory themesDir = Directory(themesDirPath);
  if (!themesDir.existsSync()) {
    themesDir = await themesDir.create();
  }
  await themesDir.list(recursive: false).forEach((themeDir) async {
    //final themeDir = Directory(path.join(themesDir, themedir));
    File themefile = File(path.join(themeDir.path, "theme.yml"));
    if (themefile.existsSync()) {
      try {
        var data = await loadFileYamlTheme(themefile.path, themeDir.path);

        if (data != null) {
          themes[path.basename(themeDir.path)] = data;
        }
      } catch (e) {
        print("Failed to load theme: $themefile with exception: $e");
      }
    }
  });

  return themes;
}

Future<YamlMap?> readAssetYamlTheme(String themefile) async {
  final contents = await rootBundle.loadString(themefile);
  return loadYaml(contents);
}

Future<Map<String, OpaqueThemeType>?> loadAssetYamlTheme(String themefile) async {
  final yml = await readAssetYamlTheme(themefile);

  if (yml == null) {
    print("Error: failed to load theme: $themefile");
    return null;
  }
  return loadYamlTheme(yml);
}

Future<Map<String, OpaqueThemeType>?> loadFileYamlTheme(String themefile, String assetsDir) async {
  final file = File(themefile);
  if (!file.existsSync()) {
    print("Error: theme file: $themefile does not exist");
    return null;
  }
  final contents = file.readAsStringSync();
  final yml = await loadYaml(contents);
  if (yml == null) {
    print("Error: failed to load theme: $themefile");
    return null;
  }
  return loadYamlTheme(yml, assetsDir);
}

Future<Map<String, OpaqueThemeType>?> loadYamlTheme(YamlMap yml, [String? assetsDir]) async {
  Map<String, OpaqueThemeType> subthemes = Map();
  if ((yml["themes"] as YamlMap).containsKey(mode_dark)) {
    subthemes[mode_dark] = YmlTheme(yml, yml["themes"]["name"], mode_dark, assetsDir);
  }
  if ((yml["themes"] as YamlMap).containsKey(mode_light)) {
    subthemes[mode_light] = YmlTheme(yml, yml["themes"]["name"], mode_light, assetsDir);
  }
  return subthemes;
}

class YmlTheme extends OpaqueThemeType {
  late YamlMap yml;
  late String mode;
  late String theme;
  late String? assetsDir;
  late OpaqueThemeType fallbackTheme;

  YmlTheme(YamlMap yml, theme, mode, assetsDir) {
    this.yml = yml;
    this.theme = theme;
    this.mode = mode;
    this.assetsDir = assetsDir;
    if (mode == mode_dark) {
      fallbackTheme = CwtchDark();
    } else {
      fallbackTheme = CwtchLight();
    }
  }

  Color? getColor(String name) {
    var val = yml["themes"][mode]["theme"][name];
    if (!(val is int)) {
      val = yml["themes"][mode]["theme"][val] ?? val;
    }
    if (!(val is int)) {
      val = yml["themes"][mode]?["colors"]?[val] ?? val;
    }
    if (!(val is int)) {
      val = yml["colors"]?[val];
    }
    if (!(val is int)) {
      return null;
    }

    if (val <= 0xFFFFFF) {
      return Color(0xFF000000 + val);
    } else {
      return Color(val);
    }
  }

  String? getImage(String name) {
    var val = yml["themes"][mode]["theme"]?[name];
    if (val != null) {
      if (assetsDir == null) {
        return path.join("assets", "themes", yml["themes"]["name"], val);
      } else {
        return val;
      }
    }
    return null;
  }

  get backgroundMainColor => getColor("backgroundMainColor") ?? fallbackTheme.backgroundMainColor;
  get backgroundPaneColor => getColor("backgroundPaneColor") ?? fallbackTheme.backgroundPaneColor;
  get topbarColor => getColor("topbarColor") ?? fallbackTheme.topbarColor;
  get mainTextColor => getColor("mainTextColor") ?? fallbackTheme.mainTextColor;
  get hilightElementColor => getColor("hilightElementColor") ?? fallbackTheme.hilightElementColor;
  get backgroundHilightElementColor => getColor("backgroundHilightElementColor") ?? fallbackTheme.backgroundHilightElementColor;
  get sendHintTextColor => getColor("sendHintTextColor") ?? fallbackTheme.sendHintTextColor;
  get defaultButtonColor => getColor("defaultButtonColor") ?? fallbackTheme.defaultButtonColor;
  get defaultButtonActiveColor => /*mode == mode_light ? darken(defaultButtonColor) :*/ lighten(getColor("defaultButtonColor") ?? fallbackTheme.defaultButtonColor);
  get defaultButtonTextColor => getColor("defaultButtonTextColor") ?? fallbackTheme.defaultButtonTextColor;
  get defaultButtonDisabledColor => getColor("defaultButtonDisabledColor") ?? fallbackTheme.defaultButtonDisabledColor;
  get textfieldBackgroundColor => getColor("textfieldBackgroundColor") ?? fallbackTheme.textfieldBackgroundColor;
  get textfieldBorderColor => getColor("textfieldBorderColor") ?? fallbackTheme.textfieldBorderColor;
  get textfieldHintColor => getColor("textfieldHintColor") ?? fallbackTheme.textfieldHintColor;
  get textfieldErrorColor => getColor("textfieldErrorColor") ?? fallbackTheme.textfieldErrorColor;
  get textfieldSelectionColor => getColor("textfieldSelectionColor") ?? fallbackTheme.textfieldSelectionColor;
  get scrollbarDefaultColor => getColor("scrollbarDefaultColor") ?? fallbackTheme.scrollbarDefaultColor;
  get portraitBackgroundColor => getColor("portraitBackgroundColor") ?? fallbackTheme.portraitBackgroundColor;
  get portraitOnlineBorderColor => getColor("portraitOnlineBorderColor") ?? fallbackTheme.portraitOnlineBorderColor;
  get portraitOfflineBorderColor => getColor("portraitOfflineBorderColor") ?? fallbackTheme.portraitOfflineBorderColor;
  get portraitBlockedBorderColor => getColor("portraitBlockedBorderColor") ?? fallbackTheme.portraitBlockedBorderColor;
  get portraitBlockedTextColor => getColor("portraitBlockedTextColor") ?? fallbackTheme.portraitBlockedTextColor;
  get portraitContactBadgeColor => getColor("portraitContactBadgeColor") ?? fallbackTheme.portraitContactBadgeColor;
  get portraitContactBadgeTextColor => getColor("portraitContactBadgeTextColor") ?? fallbackTheme.portraitContactBadgeTextColor;
  get portraitProfileBadgeColor => getColor("portraitProfileBadgeColor") ?? fallbackTheme.portraitProfileBadgeColor;
  get portraitProfileBadgeTextColor => getColor("portraitProfileBadgeTextColor") ?? fallbackTheme.portraitProfileBadgeTextColor;
  get portraitOnlineAwayColor => getColor("portraitOnlineAwayColor") ?? fallbackTheme.portraitOnlineAwayColor;
  get portraitOnlineBusyColor => getColor("portraitOnlineBusyColor") ?? fallbackTheme.portraitOnlineBusyColor;
  get dropShadowColor => getColor("dropShadowColor") ?? fallbackTheme.dropShadowColor;
  get toolbarIconColor => getColor("toolbarIconColor") ?? fallbackTheme.toolbarIconColor;
  get chatReactionIconColor => getColor("chatReactionIconColor") ?? fallbackTheme.chatReactionIconColor;
  get messageFromMeBackgroundColor => getColor("messageFromMeBackgroundColor") ?? fallbackTheme.messageFromMeBackgroundColor;
  get messageFromMeTextColor => getColor("messageFromMeTextColor") ?? fallbackTheme.messageFromMeTextColor;
  get messageFromOtherBackgroundColor => getColor("messageFromOtherBackgroundColor") ?? fallbackTheme.messageFromOtherBackgroundColor;
  get messageFromOtherTextColor => getColor("messageFromOtherTextColor") ?? fallbackTheme.messageFromOtherTextColor;
  get messageSelectionColor => getColor("messageSelectionColor") ?? fallbackTheme.messageSelectionColor;
  get menuBackgroundColor => getColor("menuBackgroundColor") ?? fallbackTheme.menuBackgroundColor;
  get snackbarBackgroundColor => getColor("snackbarBackgroundColor") ?? fallbackTheme.snackbarBackgroundColor;
  get snackbarTextColor => getColor("snackbarTextColor") ?? fallbackTheme.snackbarTextColor;

  // Images

  get chatImageColor => getColor("chatImageColor") ?? fallbackTheme.chatImageColor;
  get chatImage => getImage("chatImage") ?? fallbackTheme.chatImage;

  ImageProvider loadImage(String key, {BuildContext? context}) {
    File f = File(key);
    if (f.existsSync()) {
      return FileImage(f);
    }

    final assetsDir = this.assetsDir;
    if (assetsDir != null) {
      File f = File(path.join(assetsDir, key));
      if (f.existsSync()) {
        return FileImage(f);
      }
    }

    if (context != null) {
      File af = File(path.join(Provider.of<FlwtchState>(context, listen: false).cwtch.getAssetsDir(), key));
      if (af.existsSync()) {
        return FileImage(af);
      }
    }

    return AssetImage(key);
  }
}