import { defineStore } from 'pinia';
import { computed, ref } from 'vue';
import { SystemThemeType, ThemeType, ThemeColorConfig } from '@/../bindings/voidraft/internal/models/models';
import { ThemeService } from '@/../bindings/voidraft/internal/services';
import { useConfigStore } from './configStore';
import { useEditorStore } from './editorStore';
import type { ThemeColors } from '@/views/editor/theme/types';
import { cloneThemeColors, FALLBACK_THEME_NAME, themePresetList, themePresetMap } from '@/views/editor/theme/presets';

type ThemeOption = { name: string; type: ThemeType };

const resolveThemeName = (name?: string) =>
  name && themePresetMap[name] ? name : FALLBACK_THEME_NAME;

const createThemeOptions = (type: ThemeType): ThemeOption[] =>
  themePresetList
    .filter(preset => preset.type === type)
    .map(preset => ({ name: preset.name, type: preset.type }));

const darkThemeOptions = createThemeOptions(ThemeType.ThemeTypeDark);
const lightThemeOptions = createThemeOptions(ThemeType.ThemeTypeLight);

const cloneColors = (colors: ThemeColorConfig): ThemeColors =>
  JSON.parse(JSON.stringify(colors)) as ThemeColors;

const getPresetColors = (name: string): ThemeColors => {
  const preset = themePresetMap[name] ?? themePresetMap[FALLBACK_THEME_NAME];
  const colors = cloneThemeColors(preset.colors);
  colors.themeName = name;
  return colors;
};

const fetchThemeColors = async (themeName: string): Promise<ThemeColors> => {
  const safeName = resolveThemeName(themeName);
  try {
    const theme = await ThemeService.GetThemeByName(safeName);
    if (theme?.colors) {
      const colors = cloneColors(theme.colors);
      colors.themeName = safeName;
      return colors;
    }
  } catch (error) {
    console.error('Failed to load theme override:', error);
  }
  return getPresetColors(safeName);
};

export const useThemeStore = defineStore('theme', () => {
  const configStore = useConfigStore();
  const currentColors = ref<ThemeColors | null>(null);

  const currentTheme = computed(
    () => configStore.config?.appearance?.systemTheme || SystemThemeType.SystemThemeAuto
  );

  const isDarkMode = computed(
    () =>
      currentTheme.value === SystemThemeType.SystemThemeDark ||
      (currentTheme.value === SystemThemeType.SystemThemeAuto &&
        window.matchMedia('(prefers-color-scheme: dark)').matches)
  );

  const availableThemes = computed<ThemeOption[]>(() =>
    isDarkMode.value ? darkThemeOptions : lightThemeOptions
  );

  const applyThemeToDOM = (theme: SystemThemeType) => {
    const themeMap = {
      [SystemThemeType.SystemThemeAuto]: 'auto',
      [SystemThemeType.SystemThemeDark]: 'dark',
      [SystemThemeType.SystemThemeLight]: 'light',
    };
    document.documentElement.setAttribute('data-theme', themeMap[theme]);
  };

  const loadThemeColors = async (themeName?: string) => {
    const targetName = resolveThemeName(
      themeName || configStore.config?.appearance?.currentTheme
    );
    currentColors.value = await fetchThemeColors(targetName);
  };

  const initializeTheme = async () => {
    applyThemeToDOM(currentTheme.value);
    await loadThemeColors();
  };

  const setTheme = async (theme: SystemThemeType) => {
    await configStore.setSystemTheme(theme);
    applyThemeToDOM(theme);
    refreshEditorTheme();
  };

  const switchToTheme = async (themeName: string) => {
    if (!themePresetMap[themeName]) {
      console.error('Theme not found:', themeName);
      return false;
    }

    await loadThemeColors(themeName);
    await configStore.setCurrentTheme(themeName);
    refreshEditorTheme();
    return true;
  };

  const updateCurrentColors = (colors: Partial<ThemeColors>) => {
    if (!currentColors.value) return;
    Object.assign(currentColors.value, colors);
  };

  const saveCurrentTheme = async () => {
    if (!currentColors.value) {
      throw new Error('No theme selected');
    }

    const themeName = resolveThemeName(currentColors.value.themeName);
    currentColors.value.themeName = themeName;

    await ThemeService.UpdateTheme(themeName, currentColors.value as unknown as ThemeColorConfig);

    await loadThemeColors(themeName);
    refreshEditorTheme();
    return true;
  };

  const resetCurrentTheme = async () => {
    if (!currentColors.value) {
      throw new Error('No theme selected');
    }

    const themeName = resolveThemeName(currentColors.value.themeName);
    await ThemeService.ResetTheme(themeName);

    await loadThemeColors(themeName);
    refreshEditorTheme();
    return true;
  };

  const refreshEditorTheme = () => {
    applyThemeToDOM(currentTheme.value);
    const editorStore = useEditorStore();
    editorStore?.applyThemeSettings();
  };

  return {
    availableThemes,
    currentTheme,
    currentColors,
    isDarkMode,
    setTheme,
    switchToTheme,
    initializeTheme,
    updateCurrentColors,
    saveCurrentTheme,
    resetCurrentTheme,
    refreshEditorTheme,
    applyThemeToDOM,
  };
});