import { ref, watch } from 'vue-demi';
import { createDrauu } from 'drauu';
import { createEventHook, unrefElement } from '@vueuse/core';
import { tryOnScopeDispose } from '@vueuse/shared';

function useDrauu(target, options) {
  const drauuInstance = ref();
  let disposables = [];
  const onChangedHook = createEventHook();
  const onCanceledHook = createEventHook();
  const onCommittedHook = createEventHook();
  const onStartHook = createEventHook();
  const onEndHook = createEventHook();
  const canUndo = ref(false);
  const canRedo = ref(false);
  const altPressed = ref(false);
  const shiftPressed = ref(false);
  const brush = ref({
    color: "black",
    size: 3,
    arrowEnd: false,
    cornerRadius: 0,
    dasharray: void 0,
    fill: "transparent",
    mode: "draw",
    ...options == null ? void 0 : options.brush
  });
  watch(brush, () => {
    const instance = drauuInstance.value;
    if (instance) {
      instance.brush = brush.value;
      instance.mode = brush.value.mode;
    }
  }, { deep: true });
  const undo = () => {
    var _a;
    return (_a = drauuInstance.value) == null ? void 0 : _a.undo();
  };
  const redo = () => {
    var _a;
    return (_a = drauuInstance.value) == null ? void 0 : _a.redo();
  };
  const clear = () => {
    var _a;
    return (_a = drauuInstance.value) == null ? void 0 : _a.clear();
  };
  const cancel = () => {
    var _a;
    return (_a = drauuInstance.value) == null ? void 0 : _a.cancel();
  };
  const load = (svg) => {
    var _a;
    return (_a = drauuInstance.value) == null ? void 0 : _a.load(svg);
  };
  const dump = () => {
    var _a;
    return (_a = drauuInstance.value) == null ? void 0 : _a.dump();
  };
  const cleanup = () => {
    var _a;
    disposables.forEach((dispose) => dispose());
    (_a = drauuInstance.value) == null ? void 0 : _a.unmount();
  };
  const syncStatus = () => {
    if (drauuInstance.value) {
      canUndo.value = drauuInstance.value.canUndo();
      canRedo.value = drauuInstance.value.canRedo();
      altPressed.value = drauuInstance.value.altPressed;
      shiftPressed.value = drauuInstance.value.shiftPressed;
    }
  };
  watch(
    () => unrefElement(target),
    (el) => {
      if (!el || typeof SVGSVGElement === "undefined" || !(el instanceof SVGSVGElement))
        return;
      if (drauuInstance.value)
        cleanup();
      drauuInstance.value = createDrauu({ el, ...options });
      syncStatus();
      disposables = [
        drauuInstance.value.on("canceled", () => onCanceledHook.trigger()),
        drauuInstance.value.on("committed", (node) => onCommittedHook.trigger(node)),
        drauuInstance.value.on("start", () => onStartHook.trigger()),
        drauuInstance.value.on("end", () => onEndHook.trigger()),
        drauuInstance.value.on("changed", () => {
          syncStatus();
          onChangedHook.trigger();
        })
      ];
    },
    { flush: "post" }
  );
  tryOnScopeDispose(() => cleanup());
  return {
    drauuInstance,
    load,
    dump,
    clear,
    cancel,
    undo,
    redo,
    canUndo,
    canRedo,
    brush,
    onChanged: onChangedHook.on,
    onCommitted: onCommittedHook.on,
    onStart: onStartHook.on,
    onEnd: onEndHook.on,
    onCanceled: onCanceledHook.on
  };
}

export { useDrauu };
