import { useEffect, useState } from "react";
import type { ImageStudioApp } from "@app/app";
import { BottomControlsIsland } from "./BottomControlsIsland";
import { CanvasViewport } from "./CanvasViewport";
import { LayersSheet } from "./LayersSheet";
import { ToolOverlay } from "./ToolOverlay";
import { labelForTool } from "./toolLabels";
import { resolveTransformTargetBounds, selectedTransformTarget } from "@editor/transform-targets";
import { handleDeleteSelectionKey, handleHistoryKey, keybindEventFromKeyboardEvent } from "@input/index";
import { useAppState } from "./useAppState";
import { useImageImport } from "./useImageImport";
import { useViewportActivityIsland } from "./useViewportActivityIsland";
import "./index.css";

export type AppProps = {
  app: ImageStudioApp;
};

export function App({ app }: AppProps) {
  const state = useAppState(app.store);
  const zoomPercent = Math.round(state.editor.viewport.zoom * 100);
  const viewportActivityIsland = useViewportActivityIsland(state.editor.viewport);
  const imageImport = useImageImport(app.store);
  const [layersOpen, setLayersOpen] = useState(false);
  const transformTarget = state.editor.transformSession?.target ?? selectedTransformTarget(state.document, state.editor.selection);

  useEffect(() => {
    const handleKeyDown = (event: KeyboardEvent) => {
      const target = event.target;
      const editableTarget =
        target instanceof HTMLElement &&
        (target.isContentEditable || target instanceof HTMLInputElement || target instanceof HTMLTextAreaElement || target instanceof HTMLSelectElement);

      if (editableTarget) return;

      const historyConsumed = handleHistoryKey({ event: keybindEventFromKeyboardEvent(event), dispatch: app.store.dispatch });
      if (historyConsumed) {
        event.preventDefault();
        return;
      }

      if (event.altKey || event.ctrlKey || event.metaKey) return;

      if (event.key.toLowerCase() === "l") {
        setLayersOpen(true);
        event.preventDefault();
        return;
      }

      const consumed = handleDeleteSelectionKey({
        event: keybindEventFromKeyboardEvent(event),
        selection: app.store.getState().editor.selection,
        dispatch: app.store.dispatch,
      });
      if (consumed) event.preventDefault();
    };

    window.addEventListener("keydown", handleKeyDown);
    return () => window.removeEventListener("keydown", handleKeyDown);
  }, [app.store]);
  const transformBounds = transformTarget ? resolveTransformTargetBounds(state.document, transformTarget) : undefined;

  return (
    <main className="relative h-full overflow-hidden bg-background text-foreground">
      {imageImport.input}
      <header className="pointer-events-none absolute inset-x-0 top-0 z-10 flex h-8 items-center justify-between px-3 text-white">
        <h1 className="text-sm font-medium">Image Studio</h1>
        <div className="text-xs">
          {state.document.name} · {labelForTool(state.editor.tools.activeTool)} · {zoomPercent}% · {state.editor.viewport.size.w}×
          {state.editor.viewport.size.h}
        </div>
      </header>
      <div className="absolute left-3 top-1/2 z-10 -translate-y-1/2">
        <ToolOverlay
          activeTool={state.editor.tools.activeTool}
          interactionMode={state.editor.tools.interactionMode}
          dispatch={app.store.dispatch}
        />
      </div>
      <LayersSheet document={state.document} selection={state.editor.selection} open={layersOpen} dispatch={app.store.dispatch} onClose={() => setLayersOpen(false)} />
      <div className="absolute inset-x-0 bottom-4 z-10 flex justify-center">
        <BottomControlsIsland
          viewport={state.editor.viewport}
          visible={Boolean(transformBounds) || viewportActivityIsland.visible}
          action={viewportActivityIsland.action}
          transformBounds={viewportActivityIsland.visible ? undefined : transformBounds}
          transformTarget={viewportActivityIsland.visible ? undefined : transformTarget}
          dispatch={app.store.dispatch}
        />
      </div>
      <CanvasViewport store={app.store} />
    </main>
  );
}

export default App;