import { computed, type ComputedRef } from "vue";
import { createContext } from "reka-ui";
import { useMagicKeys, useActiveElement } from "@vueuse/core";
import type { BarcodeProduct, ItemSummary, MaintenanceEntry, MaintenanceEntryWithDetails } from "~~/lib/api/types/data-contracts";

export enum DialogID {
  AttachmentEdit = "attachment-edit",
  ChangePassword = "changePassword",
  CreateItem = "create-item",
  CreateLocation = "create-location",
  CreateLabel = "create-label",
  CreateNotifier = "create-notifier",
  DuplicateSettings = "duplicate-settings",
  DuplicateTemporarySettings = "duplicate-temporary-settings",
  EditMaintenance = "edit-maintenance",
  Import = "import",
  ItemImage = "item-image",
  ItemTableSettings = "item-table-settings",
  PrintLabel = "print-label",
  ProductImport = "product-import",
  QuickMenu = "quick-menu",
  Scanner = "scanner",
  PageQRCode = "page-qr-code",
  UpdateLabel = "update-label",
  UpdateLocation = "update-location",
  ItemChangeDetails = "item-table-updater",
}

/**
 * - Keys present without ? => params required
 * - Keys present with ?    => params optional
 * - Keys not present       => no params allowed
 */
export type DialogParamsMap = {
  [DialogID.ItemImage]: (
    | {
        type: "preloaded";
        originalSrc: string;
        originalType?: string;
        thumbnailSrc?: string;
      }
    | {
        type: "attachment";
        mimeType: string;
        thumbnailId?: string;
      }
  ) & {
    itemId: string;
    attachmentId: string;
  };
  [DialogID.CreateItem]?: { product?: BarcodeProduct };
  [DialogID.ProductImport]?: { barcode?: string };
  [DialogID.EditMaintenance]:
    | { type: "create"; itemId: string | string[] }
    | { type: "update"; maintenanceEntry: MaintenanceEntry | MaintenanceEntryWithDetails }
    | { type: "duplicate"; maintenanceEntry: MaintenanceEntry | MaintenanceEntryWithDetails; itemId: string };
  [DialogID.ItemChangeDetails]: {
    items: ItemSummary[];
    changeLocation?: boolean;
    addLabels?: boolean;
    removeLabels?: boolean;
  };
};

/**
 * Defines the payload type for a dialog's onClose callback.
 */
export type DialogResultMap = {
  [DialogID.ItemImage]?: { action: "delete"; id: string };
  [DialogID.EditMaintenance]?: boolean;
  [DialogID.ItemChangeDetails]?: boolean;
};

/** Helpers to split IDs by requirement */
type OptionalKeys<T> = {
  // eslint-disable-next-line @typescript-eslint/no-empty-object-type
  [K in keyof T]-?: {} extends Pick<T, K> ? K : never;
}[keyof T];

type RequiredKeys<T> = Exclude<keyof T, OptionalKeys<T>>;

type SpecifiedDialogIDs = keyof DialogParamsMap;
export type NoParamDialogIDs = Exclude<DialogID, SpecifiedDialogIDs>;
export type RequiredDialogIDs = RequiredKeys<DialogParamsMap>;
export type OptionalDialogIDs = OptionalKeys<DialogParamsMap>;

type ParamsOf<T extends DialogID> = T extends SpecifiedDialogIDs ? DialogParamsMap[T] : never;

type ResultOf<T extends DialogID> = T extends keyof DialogResultMap ? DialogResultMap[T] : void;

type OpenDialog = {
  // Dialogs with no parameters
  <T extends NoParamDialogIDs>(
    dialogId: T,
    options?: { onClose?: (result?: ResultOf<T>) => void; params?: never }
  ): void;
  // Dialogs with required parameters
  <T extends RequiredDialogIDs>(
    dialogId: T,
    options: { params: ParamsOf<T>; onClose?: (result?: ResultOf<T>) => void }
  ): void;
  // Dialogs with optional parameters
  <T extends OptionalDialogIDs>(
    dialogId: T,
    options?: { params?: ParamsOf<T>; onClose?: (result?: ResultOf<T>) => void }
  ): void;
};

type CloseDialog = {
  // Close the currently active dialog, no ID specified. No result payload.
  (): void;
  // Close a specific dialog that has a defined result type.
  <T extends keyof DialogResultMap>(dialogId: T, result?: ResultOf<T>): void;
  // Close a specific dialog that has NO defined result type.
  <T extends Exclude<DialogID, keyof DialogResultMap>>(dialogId: T, result?: never): void;
  <T extends DialogID>(dialogId: T): void;
};

type OpenCallback = {
  <T extends NoParamDialogIDs>(dialogId: T, cb: () => void): () => void;
  <T extends RequiredDialogIDs>(dialogId: T, cb: (params: ParamsOf<T>) => void): () => void;
  <T extends OptionalDialogIDs>(dialogId: T, cb: (params?: ParamsOf<T>) => void): () => void;
};

export const [useDialog, provideDialogContext] = createContext<{
  activeDialog: ComputedRef<DialogID | null>;
  activeAlerts: ComputedRef<string[]>;
  registerOpenDialogCallback: OpenCallback;
  openDialog: OpenDialog;
  closeDialog: CloseDialog;
  addAlert: (alertId: string) => void;
  removeAlert: (alertId: string) => void;
}>("DialogProvider");

/**
 * Hotkey helper:
 * - No/optional params: pass dialogId + key
 * - Required params: pass dialogId + key + getParams()
 */
type HotkeyKey = {
  shift?: boolean;
  ctrl?: boolean;
  code: string;
};

export function useDialogHotkey<T extends NoParamDialogIDs | OptionalDialogIDs>(dialogId: T, key: HotkeyKey): void;
export function useDialogHotkey<T extends RequiredDialogIDs>(
  dialogId: T,
  key: HotkeyKey,
  getParams: () => ParamsOf<T>
): void;
export function useDialogHotkey(dialogId: DialogID, key: HotkeyKey, getParams?: () => unknown) {
  const { openDialog } = useDialog();

  const activeElement = useActiveElement();

  const notUsingInput = computed(
    () => activeElement.value?.tagName !== "INPUT" && activeElement.value?.tagName !== "TEXTAREA"
  );

  useMagicKeys({
    passive: false,
    onEventFired: event => {
      if (
        notUsingInput.value &&
        event.type === "keydown" &&
        event.code === key.code &&
        (key.shift === undefined || event.shiftKey === key.shift) &&
        (key.ctrl === undefined || event.ctrlKey === key.ctrl)
      ) {
        if (getParams) {
          openDialog(dialogId as RequiredDialogIDs, {
            params: getParams() as never,
          });
        } else {
          openDialog(dialogId as NoParamDialogIDs);
        }
        event.preventDefault();
      }
    },
  });
}