import { createFailure, createSuccess, type FacadeResponse } from "./facade-envelope.js";
import type { WebModuleRouter } from "./module-router.js";
import { viewEndpoint, type ViewOwner } from "./part-view-facade.js";

export type WindowPanel = { objectName: string; title: string; visible: boolean; enabled?: boolean };
export type WindowLayout = {
  windows: Array<{ documentId: string; label: string }>;
  columns: number; rows: number; activeDocument: string | null;
};
export type WindowHostResult = Partial<WindowLayout> & {
  command: string; documentId: string; items?: WindowPanel[]; locked?: boolean;
};
type Host = {
  snapshot(): { panels: WindowPanel[]; toolbar: string };
  apply(value: WindowHostResult, owner: ViewOwner): void;
};
let host: Host | undefined;
export function registerWebWindowHost(value: Host) {
  host = value;
  return () => { if (host === value) host = undefined; };
}

export function executeWebWindowHost(router: WebModuleRouter, command: string,
  args: Record<string, unknown>, documentId: string): Promise<FacadeResponse> | undefined {
  if (!["Std_DockViewMenu", "Std_TileWindows", "Std_ToggleToolBarLock"].includes(command)) return;
  const mounted = host;
  if (!mounted) return Promise.resolve(createFailure("desktop-Web", "window_host_unavailable", "The workbench window host is not mounted"));
  const owner = args.runtimeOwner ?? "PartBox";
  if (owner !== "PartBox" && owner !== "DocumentProbe")
    return Promise.resolve(createFailure("desktop-Web", "wrong_document_owner", "Select the document's native runtime"));
  if (!documentId.trim() || (args.documentId !== undefined && args.documentId !== documentId))
    return Promise.resolve(createFailure("desktop-Web", "document_mismatch", "Command document identifiers differ"));
  return router.request("Part", viewEndpoint(owner), {
    schema: "freecad-web/document-view/v1", owner, document: documentId, command,
    parameters: { ...args, documentId, host: mounted.snapshot() },
  }, documentId).then(response => {
    if (response.kind !== "result") return response;
    const value = response.result as WindowHostResult;
    if (!value || value.command !== command || value.documentId !== documentId)
      return createFailure(response.requestId, "native_protocol_error", "Window response identity mismatch");
    if (command === "Std_DockViewMenu" && (!Array.isArray(value.items)
      || value.items.some(item => !item || typeof item.objectName !== "string" || typeof item.title !== "string"
        || typeof item.visible !== "boolean" || typeof item.enabled !== "boolean")))
      return createFailure(response.requestId, "native_protocol_error", "Invalid native dock actions");
    if (command === "Std_ToggleToolBarLock" && typeof value.locked !== "boolean")
      return createFailure(response.requestId, "native_protocol_error", "Invalid native toolbar lock state");
    if (command === "Std_TileWindows" && (!Array.isArray(value.windows) || !value.windows.length
      || value.windows.some(item => !item || typeof item.documentId !== "string" || !item.documentId || typeof item.label !== "string")
      || !Number.isInteger(value.columns) || (value.columns ?? 0) < 1
      || !Number.isInteger(value.rows) || (value.rows ?? 0) < 1
      || !(value.activeDocument === null || typeof value.activeDocument === "string")))
      return createFailure(response.requestId, "native_protocol_error", "Invalid native window layout");
    if (host !== mounted)
      return createFailure(response.requestId, "window_host_unavailable", "The workbench window host changed during the command");
    mounted.apply(value, owner);
    return createSuccess(response.requestId, {
      schema: "freecad-web/document-view-batch/v1", owner, documentId,
      records: [{ apiId: `Web:desktop:${command}`, name: command, status: "success", native: true, result: value }], count: 1,
    });
  });
}