import { WebApplication } from '@/ui_models/application';
import { AppState } from '@/ui_models/app_state';
import {
  Disclosure,
  DisclosureButton,
  DisclosurePanel,
} from '@reach/disclosure';
import {
  ComponentArea,
  ContentType,
  SNComponent,
  SNTheme,
} from '@standardnotes/snjs';
import { observer } from 'mobx-react-lite';
import { FunctionComponent } from 'preact';
import { useCallback, useEffect, useRef, useState } from 'preact/hooks';
import { JSXInternal } from 'preact/src/jsx';
import { Icon } from '../Icon';
import { Switch } from '../Switch';
import { toDirective, useCloseOnBlur } from '../utils';
import {
  quickSettingsKeyDownHandler,
  themesMenuKeyDownHandler,
} from './eventHandlers';
import { FocusModeSwitch } from './FocusModeSwitch';
import { ThemesMenuButton } from './ThemesMenuButton';

const focusModeAnimationDuration = 1255;

const MENU_CLASSNAME =
  'sn-menu-border sn-dropdown min-w-80 max-h-120 max-w-xs flex flex-col py-2 overflow-y-auto';

type MenuProps = {
  appState: AppState;
  application: WebApplication;
};

const toggleFocusMode = (enabled: boolean) => {
  if (enabled) {
    document.body.classList.add('focus-mode');
  } else {
    if (document.body.classList.contains('focus-mode')) {
      document.body.classList.add('disable-focus-mode');
      document.body.classList.remove('focus-mode');
      setTimeout(() => {
        document.body.classList.remove('disable-focus-mode');
      }, focusModeAnimationDuration);
    }
  }
};

export const sortThemes = (a: SNTheme, b: SNTheme) => {
  const aIsLayerable = a.isLayerable();
  const bIsLayerable = b.isLayerable();

  if (aIsLayerable && !bIsLayerable) {
    return 1;
  } else if (!aIsLayerable && bIsLayerable) {
    return -1;
  } else {
    return a.name.toLowerCase() < b.name.toLowerCase() ? -1 : 1;
  }
};

const QuickSettingsMenu: FunctionComponent<MenuProps> = observer(
  ({ application, appState }) => {
    const {
      closeQuickSettingsMenu,
      shouldAnimateCloseMenu,
      focusModeEnabled,
      setFocusModeEnabled,
    } = appState.quickSettingsMenu;
    const [themes, setThemes] = useState<SNTheme[]>([]);
    const [toggleableComponents, setToggleableComponents] = useState<
      SNComponent[]
    >([]);
    const [themesMenuOpen, setThemesMenuOpen] = useState(false);
    const [themesMenuPosition, setThemesMenuPosition] = useState({});
    const [defaultThemeOn, setDefaultThemeOn] = useState(false);

    const themesMenuRef = useRef<HTMLDivElement>(null);
    const themesButtonRef = useRef<HTMLButtonElement>(null);
    const prefsButtonRef = useRef<HTMLButtonElement>(null);
    const quickSettingsMenuRef = useRef<HTMLDivElement>(null);
    const defaultThemeButtonRef = useRef<HTMLButtonElement>(null);

    useEffect(() => {
      toggleFocusMode(focusModeEnabled);
    }, [focusModeEnabled]);

    const reloadThemes = useCallback(() => {
      const themes = application.getDisplayableItems(
        ContentType.Theme
      ) as SNTheme[];
      setThemes(themes.sort(sortThemes));
      setDefaultThemeOn(
        !themes.find((theme) => theme.active && !theme.isLayerable())
      );
    }, [application]);

    const reloadToggleableComponents = useCallback(() => {
      const toggleableComponents = (
        application.getDisplayableItems(ContentType.Component) as SNComponent[]
      ).filter((component) =>
        [ComponentArea.EditorStack, ComponentArea.TagsList].includes(
          component.area
        )
      );
      setToggleableComponents(toggleableComponents);
    }, [application]);

    useEffect(() => {
      const cleanupItemStream = application.streamItems(
        ContentType.Theme,
        () => {
          reloadThemes();
        }
      );

      return () => {
        cleanupItemStream();
      };
    }, [application, reloadThemes]);

    useEffect(() => {
      const cleanupItemStream = application.streamItems(
        ContentType.Component,
        () => {
          reloadToggleableComponents();
        }
      );

      return () => {
        cleanupItemStream();
      };
    }, [application, reloadToggleableComponents]);

    useEffect(() => {
      if (themesMenuOpen) {
        defaultThemeButtonRef.current?.focus();
      }
    }, [themesMenuOpen]);

    useEffect(() => {
      prefsButtonRef.current?.focus();
    }, []);

    const [closeOnBlur] = useCloseOnBlur(
      themesMenuRef as any,
      setThemesMenuOpen
    );

    const toggleThemesMenu = () => {
      if (!themesMenuOpen && themesButtonRef.current) {
        const themesButtonRect =
          themesButtonRef.current.getBoundingClientRect();
        setThemesMenuPosition({
          left: themesButtonRect.right,
          bottom:
            document.documentElement.clientHeight - themesButtonRect.bottom,
        });
        setThemesMenuOpen(true);
      } else {
        setThemesMenuOpen(false);
      }
    };

    const openPreferences = () => {
      closeQuickSettingsMenu();
      appState.preferences.openPreferences();
    };

    const toggleComponent = (component: SNComponent) => {
      if (component.isTheme()) {
        application.toggleTheme(component);
      } else {
        application.toggleComponent(component);
      }
    };

    const handleBtnKeyDown: React.KeyboardEventHandler<HTMLButtonElement> = (
      event
    ) => {
      switch (event.key) {
        case 'Escape':
          setThemesMenuOpen(false);
          themesButtonRef.current?.focus();
          break;
        case 'ArrowRight':
          if (!themesMenuOpen) {
            toggleThemesMenu();
          }
      }
    };

    const handleQuickSettingsKeyDown: JSXInternal.KeyboardEventHandler<
      HTMLDivElement
    > = (event) => {
      quickSettingsKeyDownHandler(
        closeQuickSettingsMenu,
        event,
        quickSettingsMenuRef,
        themesMenuOpen
      );
    };

    const handlePanelKeyDown: React.KeyboardEventHandler<HTMLDivElement> = (
      event
    ) => {
      themesMenuKeyDownHandler(
        event,
        themesMenuRef,
        setThemesMenuOpen,
        themesButtonRef
      );
    };

    const toggleDefaultTheme = () => {
      const activeTheme = themes.find(
        (theme) => theme.active && !theme.isLayerable()
      );
      if (activeTheme) application.toggleTheme(activeTheme);
    };

    return (
      <div className="sn-component">
        <div
          className={`sn-quick-settings-menu absolute ${MENU_CLASSNAME} ${
            shouldAnimateCloseMenu
              ? 'slide-up-animation'
              : 'sn-dropdown--animated'
          }`}
          ref={quickSettingsMenuRef}
          onKeyDown={handleQuickSettingsKeyDown}
        >
          <div className="px-3 mt-1 mb-2 font-semibold color-text uppercase">
            Quick Settings
          </div>
          {themes && themes.length ? (
            <Disclosure open={themesMenuOpen} onChange={toggleThemesMenu}>
              <DisclosureButton
                onKeyDown={handleBtnKeyDown}
                onBlur={closeOnBlur}
                ref={themesButtonRef}
                className="sn-dropdown-item justify-between focus:bg-info-backdrop focus:shadow-none"
              >
                <div className="flex items-center">
                  <Icon type="themes" className="color-neutral mr-2" />
                  Themes
                </div>
                <Icon type="chevron-right" className="color-neutral" />
              </DisclosureButton>
              <DisclosurePanel
                onBlur={closeOnBlur}
                ref={themesMenuRef}
                onKeyDown={handlePanelKeyDown}
                style={{
                  ...themesMenuPosition,
                }}
                className={`${MENU_CLASSNAME} fixed sn-dropdown--animated`}
              >
                <div className="px-3 my-1 font-semibold color-text uppercase">
                  Themes
                </div>
                <button
                  className="sn-dropdown-item focus:bg-info-backdrop focus:shadow-none"
                  onClick={toggleDefaultTheme}
                  onBlur={closeOnBlur}
                  ref={defaultThemeButtonRef}
                >
                  <div
                    className={`pseudo-radio-btn ${
                      defaultThemeOn ? 'pseudo-radio-btn--checked' : ''
                    } mr-2`}
                  ></div>
                  Default
                </button>
                {themes.map((theme) => (
                  <ThemesMenuButton
                    theme={theme}
                    application={application}
                    key={theme.uuid}
                    onBlur={closeOnBlur}
                  />
                ))}
              </DisclosurePanel>
            </Disclosure>
          ) : null}
          {toggleableComponents.map((component) => (
            <button
              className="sn-dropdown-item justify-between focus:bg-info-backdrop focus:shadow-none"
              onClick={() => {
                toggleComponent(component);
              }}
            >
              <div className="flex items-center">
                <Icon type="window" className="color-neutral mr-2" />
                {component.name}
              </div>
              <Switch checked={component.active} className="px-0" />
            </button>
          ))}
          <FocusModeSwitch
            application={application}
            onToggle={setFocusModeEnabled}
            onClose={closeQuickSettingsMenu}
            isEnabled={focusModeEnabled}
          />
          <div className="h-1px my-2 bg-border"></div>
          <button
            className="sn-dropdown-item focus:bg-info-backdrop focus:shadow-none"
            onClick={openPreferences}
            ref={prefsButtonRef}
          >
            <Icon type="more" className="color-neutral mr-2" />
            Open Preferences
          </button>
        </div>
      </div>
    );
  }
);

export const QuickSettingsMenuDirective =
  toDirective<MenuProps>(QuickSettingsMenu);