import type { Dispatch } from "@commands/dispatcher";
import type { GlobalKeybindConsumer, KeybindEvent } from "./keyboard";
import type { GlobalPointerConsumer, PointerInputEvent } from "./pointer";
import { createViewportPointerPanHandler } from "./viewport";

export type ViewportPanInputController = {
  keyDown(event: KeybindEvent): boolean;
  keyUp(event: KeybindEvent): boolean;
  pointerDown(event: PointerInputEvent): boolean;
  pointerMove(event: PointerInputEvent): boolean;
  pointerUp(event: PointerInputEvent): boolean;
  isPanMode(): boolean;
};

export function createViewportPanInputController(options: {
  globalKeyConsumer: GlobalKeybindConsumer;
  globalPointerConsumer: GlobalPointerConsumer;
  dispatch: Dispatch;
  getCurrentZoom: () => number;
  isPanMode: () => boolean;
}): ViewportPanInputController {
  const pointerPan = createViewportPointerPanHandler({
    globalConsumer: options.globalPointerConsumer,
    dispatch: options.dispatch,
    getCurrentZoom: options.getCurrentZoom,
    canPan: (event) => event.pointerType !== "mouse" || (event.buttons & 4) === 4 || (options.isPanMode() && (event.buttons & 1) === 1),
  });

  return {
    keyDown(event) {
      if (options.globalKeyConsumer(event)) return true;
      if (event.code !== "Space") return false;

      options.dispatch("tool.enterTemporaryPan", undefined);
      return true;
    },
    keyUp(event) {
      if (event.code !== "Space") return false;

      options.dispatch("tool.exitTemporaryPan", undefined);
      return true;
    },
    pointerDown: pointerPan.pointerDown,
    pointerMove: pointerPan.pointerMove,
    pointerUp: pointerPan.pointerUp,
    isPanMode: options.isPanMode,
  };
}