import { type RefObject, useEffect } from 'react';

import type {
  CanvasGenerationDialogState,
  CanvasTool,
  GenerateDialogState,
  QuickEditPanelState,
  SidebarPanel,
} from './ImageCanvasEditorTypes';

type UseImageCanvasKeyboardShortcutsOptions = {
  generateDialogRef: RefObject<GenerateDialogState | null>;
  selectedLayerIdRef: RefObject<string | null>;
  selectedLayerIdsRef?: RefObject<string[]>;
  redoCanvasChange: () => void;
  undoCanvasChange: () => void;
  deleteLayerById: (layerId: string | null) => void;
  deleteSelectedCanvasObjects?: () => void;
  selectAllCanvasObjects?: () => void;
  clearCanvasSelection?: () => void;
  copySelectedCanvasLayers?: (options?: { cut?: boolean }) => void;
  pasteCanvasClipboard?: () => boolean;
  duplicateSelectedCanvasLayers?: () => void;
  moveSelectedCanvasLayers?: (mode: 'up' | 'down' | 'top' | 'bottom') => void;
  nudgeSelectedCanvasObjects?: (delta: { x: number; y: number }) => void;
  requestRemoveCanvasGenerationDialog?: (
    dialog: CanvasGenerationDialogState,
  ) => void;
  setActiveTool: (tool: 'select') => void;
  switchTool?: (tool: CanvasTool) => void;
  updateScaleFromCenter?: (nextScale: number) => void;
  zoomViewportBy?: (scaleFactor: number) => void;
  fitLayers?: () => void;
  toggleSidebarPanel?: (panel: SidebarPanel) => void;
  toggleMinimap?: () => void;
  startProjectRename?: () => void;
  exportCanvasAssets?: () => void;
  setGenerateDialog: (
    updater:
      | GenerateDialogState
      | null
      | ((dialog: GenerateDialogState | null) => GenerateDialogState | null),
  ) => void;
  setImageContextMenu: (menu: null) => void;
  setContextMenu: (menu: null) => void;
  setQuickEditPanel: (
    updater:
      | QuickEditPanelState
      | null
      | ((panel: QuickEditPanelState | null) => QuickEditPanelState | null),
  ) => void;
  closeEditorChromePanels: () => void;
  setIsSpecMenuOpen: (open: boolean) => void;
  setIsGenerationReferenceMenuOpen: (open: boolean) => void;
  setIsPublicationReferenceMenuOpen: (open: boolean) => void;
  setIsPickingGenerationReferenceFromCanvas: (picking: boolean) => void;
  setIsPickingQuickEditReferenceFromCanvas: (picking: boolean) => void;
  setIsPickingPublicationReferenceFromCanvas: (picking: boolean) => void;
  setIsCharacterSpecMenuOpen: (open: boolean) => void;
  setIsCharacterReferenceMenuOpen: (open: boolean) => void;
  setIsPickingCharacterSpecFromCanvas: (picking: boolean) => void;
  setIsPickingCharacterReferenceFromCanvas: (picking: boolean) => void;
  setIsIconSpecMenuOpen: (open: boolean) => void;
  setIsPickingIconSpecFromCanvas: (picking: boolean) => void;
  setIsUiDesignSpecMenuOpen: (open: boolean) => void;
  setIsPickingUiDesignSpecFromCanvas: (picking: boolean) => void;
  setIsSpacePanning: (panning: boolean) => void;
  setShiftPressed: (pressed: boolean) => void;
};

function isEditableTarget(event: KeyboardEvent) {
  const target = event.target as HTMLElement | null;
  if (!target) {
    return false;
  }
  if (target.tagName === 'AUDIO' || target.tagName === 'VIDEO') {
    return false;
  }
  return (
    target.tagName === 'INPUT' ||
    target.tagName === 'TEXTAREA' ||
    target.isContentEditable
  );
}

function isCanvasGenerationPlaceholderDialog(
  dialog: GenerateDialogState | null,
) {
  return (
    Boolean(dialog?.placeholder) &&
    (dialog?.mode === 'generate' ||
      dialog?.mode === 'spec' ||
      dialog?.mode === 'character' ||
      dialog?.mode === 'icon' ||
      dialog?.mode === 'ui-design' ||
      dialog?.mode === 'quick-edit' ||
      dialog?.mode === 'publication' ||
      dialog?.mode === 'character-animation' ||
      dialog?.mode === 'video' ||
      dialog?.mode === 'audio-sound-effect' ||
      dialog?.mode === 'audio-background-music')
  );
}

function isCanvasGenerationDialogState(
  dialog: GenerateDialogState | null,
): dialog is CanvasGenerationDialogState {
  return Boolean(dialog?.id && isCanvasGenerationPlaceholderDialog(dialog));
}

function isCtrlShortcut(event: KeyboardEvent) {
  return event.ctrlKey && !event.altKey && !event.metaKey;
}

function hasSelectedText() {
  const selection = window.getSelection();
  return Boolean(selection?.toString().trim());
}

function isKey(event: KeyboardEvent, key: string, code?: string) {
  return event.key.toLowerCase() === key || event.code === code;
}

function isPlusKey(event: KeyboardEvent) {
  return (
    event.key === '+' ||
    event.key === '=' ||
    event.code === 'Equal' ||
    event.code === 'NumpadAdd'
  );
}

function isMinusKey(event: KeyboardEvent) {
  return (
    event.key === '-' ||
    event.code === 'Minus' ||
    event.code === 'NumpadSubtract'
  );
}

function getArrowDelta(event: KeyboardEvent) {
  const step = event.shiftKey ? 10 : 1;
  if (event.key === 'ArrowUp') {
    return { x: 0, y: -step };
  }
  if (event.key === 'ArrowDown') {
    return { x: 0, y: step };
  }
  if (event.key === 'ArrowLeft') {
    return { x: -step, y: 0 };
  }
  if (event.key === 'ArrowRight') {
    return { x: step, y: 0 };
  }
  return null;
}

export function useImageCanvasKeyboardShortcuts({
  generateDialogRef,
  selectedLayerIdRef,
  selectedLayerIdsRef,
  redoCanvasChange,
  undoCanvasChange,
  deleteLayerById,
  deleteSelectedCanvasObjects,
  selectAllCanvasObjects,
  clearCanvasSelection,
  copySelectedCanvasLayers,
  pasteCanvasClipboard,
  duplicateSelectedCanvasLayers,
  moveSelectedCanvasLayers,
  nudgeSelectedCanvasObjects,
  requestRemoveCanvasGenerationDialog,
  setActiveTool,
  switchTool,
  updateScaleFromCenter,
  zoomViewportBy,
  fitLayers,
  toggleSidebarPanel,
  toggleMinimap,
  startProjectRename,
  exportCanvasAssets,
  setGenerateDialog,
  setImageContextMenu,
  setContextMenu,
  setQuickEditPanel,
  closeEditorChromePanels,
  setIsSpecMenuOpen,
  setIsGenerationReferenceMenuOpen,
  setIsPublicationReferenceMenuOpen,
  setIsPickingGenerationReferenceFromCanvas,
  setIsPickingQuickEditReferenceFromCanvas,
  setIsPickingPublicationReferenceFromCanvas,
  setIsCharacterSpecMenuOpen,
  setIsCharacterReferenceMenuOpen,
  setIsPickingCharacterSpecFromCanvas,
  setIsPickingCharacterReferenceFromCanvas,
  setIsIconSpecMenuOpen,
  setIsPickingIconSpecFromCanvas,
  setIsUiDesignSpecMenuOpen,
  setIsPickingUiDesignSpecFromCanvas,
  setIsSpacePanning,
  setShiftPressed,
}: UseImageCanvasKeyboardShortcutsOptions) {
  useEffect(() => {
    const closeTransientEditorPanels = () => {
      closeEditorChromePanels();
      setIsSpecMenuOpen(false);
      setIsGenerationReferenceMenuOpen(false);
      setIsPublicationReferenceMenuOpen(false);
      setIsPickingGenerationReferenceFromCanvas(false);
      setIsPickingQuickEditReferenceFromCanvas(false);
      setIsPickingPublicationReferenceFromCanvas(false);
      setImageContextMenu(null);
      setContextMenu(null);
      setQuickEditPanel((currentPanel) =>
        currentPanel?.status === 'generating' ? currentPanel : null,
      );
      setIsCharacterSpecMenuOpen(false);
      setIsCharacterReferenceMenuOpen(false);
      setIsPickingCharacterSpecFromCanvas(false);
      setIsPickingCharacterReferenceFromCanvas(false);
      setIsIconSpecMenuOpen(false);
      setIsPickingIconSpecFromCanvas(false);
      setIsUiDesignSpecMenuOpen(false);
      setIsPickingUiDesignSpecFromCanvas(false);
      setGenerateDialog((currentDialog) => {
        if (!currentDialog || currentDialog.status === 'generating') {
          return currentDialog;
        }
        if (
          currentDialog.mode === 'generate' ||
          currentDialog.mode === 'spec' ||
          currentDialog.mode === 'ui-design' ||
          currentDialog.mode === 'quick-edit' ||
          currentDialog.mode === 'publication' ||
          currentDialog.mode === 'character-animation' ||
          currentDialog.mode === 'video'
        ) {
          return {
            ...currentDialog,
            composerOpen: false,
          };
        }
        if (currentDialog.mode === 'character') {
          return currentDialog;
        }
        if (currentDialog.mode === 'icon') {
          return currentDialog;
        }
        return null;
      });
    };

    const handleKeyDown = (event: KeyboardEvent) => {
      if (
        isCtrlShortcut(event) &&
        event.code === 'KeyZ' &&
        !isEditableTarget(event)
      ) {
        event.preventDefault();
        if (event.shiftKey) {
          redoCanvasChange();
        } else {
          undoCanvasChange();
        }
        return;
      }
      if (isCtrlShortcut(event) && !isEditableTarget(event)) {
        if (event.code === 'KeyA') {
          event.preventDefault();
          selectAllCanvasObjects?.();
          return;
        }
        if (event.code === 'KeyC') {
          if (hasSelectedText()) {
            return;
          }
          event.preventDefault();
          copySelectedCanvasLayers?.();
          return;
        }
        if (event.code === 'KeyX') {
          event.preventDefault();
          copySelectedCanvasLayers?.({ cut: true });
          return;
        }
        if (event.code === 'KeyV') {
          if (pasteCanvasClipboard?.()) {
            event.preventDefault();
          }
          return;
        }
        if (event.code === 'KeyD') {
          event.preventDefault();
          duplicateSelectedCanvasLayers?.();
          return;
        }
        if (event.code === 'KeyS' && event.shiftKey) {
          event.preventDefault();
          exportCanvasAssets?.();
          return;
        }
        if (event.key === '0' || event.code === 'Digit0') {
          event.preventDefault();
          fitLayers?.();
          return;
        }
        if (event.key === '1' || event.code === 'Digit1') {
          event.preventDefault();
          updateScaleFromCenter?.(1);
          return;
        }
        if (isPlusKey(event)) {
          event.preventDefault();
          zoomViewportBy?.(1.16);
          return;
        }
        if (isMinusKey(event)) {
          event.preventDefault();
          zoomViewportBy?.(0.86);
          return;
        }
        if (event.code === 'BracketRight') {
          event.preventDefault();
          moveSelectedCanvasLayers?.(event.shiftKey ? 'top' : 'up');
          return;
        }
        if (event.code === 'BracketLeft') {
          event.preventDefault();
          moveSelectedCanvasLayers?.(event.shiftKey ? 'bottom' : 'down');
          return;
        }
      }
      if (
        event.altKey &&
        !event.ctrlKey &&
        !event.metaKey &&
        !isEditableTarget(event)
      ) {
        if (event.code === 'Digit1') {
          event.preventDefault();
          toggleSidebarPanel?.('assets');
          return;
        }
        if (event.code === 'Digit2') {
          event.preventDefault();
          toggleSidebarPanel?.('layers');
          return;
        }
        if (event.code === 'KeyM') {
          event.preventDefault();
          toggleMinimap?.();
          return;
        }
      }
      if (
        !event.ctrlKey &&
        !event.metaKey &&
        !event.altKey &&
        !isEditableTarget(event)
      ) {
        const arrowDelta = getArrowDelta(event);
        if (arrowDelta) {
          event.preventDefault();
          nudgeSelectedCanvasObjects?.(arrowDelta);
          return;
        }
        if (event.key === 'F2') {
          event.preventDefault();
          startProjectRename?.();
          return;
        }
        if (!event.repeat && event.code === 'KeyV' && event.shiftKey) {
          event.preventDefault();
          switchTool?.('video');
          return;
        }
        if (!event.repeat && !event.shiftKey && isKey(event, 'v', 'KeyV')) {
          event.preventDefault();
          switchTool?.('select');
          return;
        }
        if (!event.repeat && !event.shiftKey && isKey(event, 'h', 'KeyH')) {
          event.preventDefault();
          switchTool?.('hand');
          return;
        }
        if (!event.repeat && !event.shiftKey && isKey(event, 'u', 'KeyU')) {
          event.preventDefault();
          switchTool?.('upload');
          return;
        }
        if (!event.repeat && !event.shiftKey && isKey(event, 'g', 'KeyG')) {
          event.preventDefault();
          switchTool?.('generate');
          return;
        }
        if (!event.repeat && !event.shiftKey && isKey(event, 'm', 'KeyM')) {
          event.preventDefault();
          switchTool?.('music');
          return;
        }
      }
      if (event.key === 'Shift') {
        setShiftPressed(true);
      }
      if (
        (event.key === 'Backspace' || event.key === 'Delete') &&
        !event.repeat &&
        !isEditableTarget(event)
      ) {
        if (selectedLayerIdsRef?.current.length) {
          event.preventDefault();
          deleteSelectedCanvasObjects?.();
          return;
        }
        const currentSelectedLayerId = selectedLayerIdRef.current;
        if (currentSelectedLayerId) {
          event.preventDefault();
          deleteLayerById(currentSelectedLayerId);
          return;
        }
        if (isCanvasGenerationPlaceholderDialog(generateDialogRef.current)) {
          event.preventDefault();
          const currentDialog = generateDialogRef.current;
          if (
            isCanvasGenerationDialogState(currentDialog) &&
            requestRemoveCanvasGenerationDialog
          ) {
            requestRemoveCanvasGenerationDialog(currentDialog);
          } else {
            setGenerateDialog(null);
          }
          setActiveTool('select');
          setIsGenerationReferenceMenuOpen(false);
          setIsPublicationReferenceMenuOpen(false);
          setIsPickingGenerationReferenceFromCanvas(false);
          setIsPickingQuickEditReferenceFromCanvas(false);
          setIsPickingPublicationReferenceFromCanvas(false);
          setIsCharacterSpecMenuOpen(false);
          setIsCharacterReferenceMenuOpen(false);
          setIsPickingCharacterSpecFromCanvas(false);
          setIsPickingCharacterReferenceFromCanvas(false);
          setIsIconSpecMenuOpen(false);
          setIsPickingIconSpecFromCanvas(false);
          setIsUiDesignSpecMenuOpen(false);
          setIsPickingUiDesignSpecFromCanvas(false);
          return;
        }
      }
      if (event.key === 'Escape') {
        closeTransientEditorPanels();
        clearCanvasSelection?.();
        return;
      }
      if (event.code !== 'Space' || event.repeat || isEditableTarget(event)) {
        return;
      }
      event.preventDefault();
      setIsSpacePanning(true);
    };
    const handleKeyUp = (event: KeyboardEvent) => {
      if (event.key === 'Shift') {
        setShiftPressed(false);
      }
      if (event.code !== 'Space') {
        return;
      }
      event.preventDefault();
      setIsSpacePanning(false);
    };
    const resetPressedInteractionState = () => {
      setShiftPressed(false);
      setIsSpacePanning(false);
    };
    const handleVisibilityChange = () => {
      if (document.visibilityState !== 'visible') {
        resetPressedInteractionState();
      }
    };

    window.addEventListener('keydown', handleKeyDown);
    window.addEventListener('keyup', handleKeyUp);
    window.addEventListener('blur', resetPressedInteractionState);
    document.addEventListener('visibilitychange', handleVisibilityChange);
    return () => {
      window.removeEventListener('keydown', handleKeyDown);
      window.removeEventListener('keyup', handleKeyUp);
      window.removeEventListener('blur', resetPressedInteractionState);
      document.removeEventListener('visibilitychange', handleVisibilityChange);
    };
  }, [
    closeEditorChromePanels,
    clearCanvasSelection,
    copySelectedCanvasLayers,
    pasteCanvasClipboard,
    duplicateSelectedCanvasLayers,
    deleteSelectedCanvasObjects,
    deleteLayerById,
    exportCanvasAssets,
    fitLayers,
    generateDialogRef,
    moveSelectedCanvasLayers,
    nudgeSelectedCanvasObjects,
    requestRemoveCanvasGenerationDialog,
    redoCanvasChange,
    selectAllCanvasObjects,
    selectedLayerIdRef,
    selectedLayerIdsRef,
    startProjectRename,
    setActiveTool,
    setContextMenu,
    setGenerateDialog,
    setImageContextMenu,
    setIsGenerationReferenceMenuOpen,
    setIsPublicationReferenceMenuOpen,
    setIsPickingGenerationReferenceFromCanvas,
    setIsPickingQuickEditReferenceFromCanvas,
    setIsPickingPublicationReferenceFromCanvas,
    setIsCharacterSpecMenuOpen,
    setIsCharacterReferenceMenuOpen,
    setIsIconSpecMenuOpen,
    setIsPickingCharacterReferenceFromCanvas,
    setIsPickingCharacterSpecFromCanvas,
    setIsPickingIconSpecFromCanvas,
    setIsPickingUiDesignSpecFromCanvas,
    setIsSpacePanning,
    setIsSpecMenuOpen,
    setIsUiDesignSpecMenuOpen,
    setQuickEditPanel,
    setShiftPressed,
    switchTool,
    toggleMinimap,
    toggleSidebarPanel,
    undoCanvasChange,
    updateScaleFromCenter,
    zoomViewportBy,
  ]);
}