import type { LocationQueryValue } from 'vue-router';
import { request } from '../request';
import {
  type ServiceRequestResult,
  normalizeNullableStringId,
  normalizeStringId,
  safeJsonRequestConfig
} from './shared';

interface BackendObjectContextMenuDTO {
  key?: string | null;
  label?: string | null;
  routeKey?: string | null;
  routePath?: string | null;
  id?: string | number | null;
  name?: string | null;
  path?: string | null;
  children?: BackendObjectContextMenuDTO[] | null;
}

interface BackendProductContextProductDTO {
  id?: string | number | null;
  code?: string | null;
  directionCode?: string | null;
  name?: string | null;
  managerUserId?: string | number | null;
  statusCode?: string | null;
}

interface BackendProductContextRoleDTO {
  roleId?: string | number | null;
  roleCode?: string | null;
  roleName?: string | null;
}

interface BackendObjectContextDTO {
  domainKey?: string | null;
  objectType?: string | null;
  objectId?: string | number | null;
  objectName?: string | null;
  objectSummary?: Record<string, unknown> | null;
  menus?: BackendObjectContextMenuDTO[] | null;
  contextScopedMenus?: BackendObjectContextMenuDTO[] | null;
  buttonCodes?: string[] | null;
  currentProduct?: BackendProductContextProductDTO | null;
  currentRole?: BackendProductContextRoleDTO | null;
  navs?: BackendObjectContextMenuDTO[] | null;
  buttons?: string[] | null;
  defaultRouteKey?: string | null;
  defaultRoutePath?: string | null;
}

function normalizeString(value: string | number | null | undefined) {
  if (value === null || value === undefined) {
    return '';
  }

  return String(value);
}

function normalizeRoutePath(path: string | null | undefined) {
  const normalizedPath = normalizeString(path).trim();

  if (!normalizedPath) {
    return '';
  }

  if (normalizedPath.startsWith('/')) {
    return normalizedPath;
  }

  return `/${normalizedPath}`;
}

function normalizeCurrentProduct(
  product: BackendProductContextProductDTO
): Record<'id' | 'code' | 'directionCode' | 'name' | 'managerUserId' | 'statusCode', string> {
  return {
    id: normalizeStringId(product.id || ''),
    code: normalizeString(product.code),
    directionCode: normalizeString(product.directionCode),
    name: normalizeString(product.name),
    managerUserId: normalizeNullableStringId(product.managerUserId) ?? '',
    statusCode: normalizeString(product.statusCode)
  };
}

function normalizeCurrentRole(role: BackendProductContextRoleDTO) {
  return {
    roleId: normalizeStringId(role.roleId || ''),
    roleCode: normalizeString(role.roleCode),
    roleName: normalizeString(role.roleName)
  };
}

function normalizeMenu(menu: BackendObjectContextMenuDTO): App.ObjectContext.Menu {
  const routeKey = normalizeString(menu.routeKey);
  const routePath = normalizeRoutePath(menu.routePath || menu.path);
  const key = normalizeString(menu.key || routeKey || routePath || menu.id);

  return {
    key,
    label: normalizeString(menu.label || menu.name),
    routeKey: routeKey || null,
    routePath: routePath || null,
    children: menu.children?.map(child => normalizeMenu(child)) || []
  };
}

function getFirstRoutableMenu(menus: App.ObjectContext.Menu[]): App.ObjectContext.Menu | null {
  for (const menu of menus) {
    if (menu.routeKey || menu.routePath) {
      return menu;
    }

    const firstChildMenu = menu.children?.length ? getFirstRoutableMenu(menu.children) : null;

    if (firstChildMenu) {
      return firstChildMenu;
    }
  }

  return null;
}

function normalizeObjectSummary(data: BackendObjectContextDTO): App.ObjectContext.Summary | null {
  if (data.objectSummary) {
    return data.objectSummary;
  }

  const summary: App.ObjectContext.Summary = {};

  if (data.currentProduct) {
    summary.currentProduct = normalizeCurrentProduct(data.currentProduct);
  }

  if (data.currentRole !== undefined) {
    summary.currentRole = data.currentRole ? normalizeCurrentRole(data.currentRole) : null;
  }

  return Object.keys(summary).length ? summary : null;
}

function createContextApiUrl(config: App.ObjectContext.DomainConfig, objectId: string) {
  if (config.contextApiObjectIdPlacement !== 'path') {
    return config.contextApiPath;
  }

  const placeholder = `{${config.contextApiObjectIdParamKey}}`;

  return config.contextApiPath.replace(placeholder, encodeURIComponent(objectId));
}

function normalizeObjectContext(
  config: App.ObjectContext.DomainConfig,
  objectId: string,
  data: BackendObjectContextDTO
): Api.ObjectContext.ContextInfo {
  const rawMenus = data.contextScopedMenus ?? data.menus ?? data.navs ?? [];
  const contextScopedMenus = rawMenus.map(menu => normalizeMenu(menu));
  const firstRoutableMenu = getFirstRoutableMenu(contextScopedMenus);
  const currentProduct = data.currentProduct ? normalizeCurrentProduct(data.currentProduct) : null;

  return {
    domainKey: (data.domainKey || config.domainKey) as App.ObjectContext.DomainKey,
    objectType: (data.objectType || config.objectType) as App.ObjectContext.ObjectType,
    objectId: normalizeString(data.objectId) || currentProduct?.id || objectId,
    objectName: normalizeString(data.objectName || currentProduct?.name),
    objectSummary: normalizeObjectSummary(data),
    contextScopedMenus,
    buttonCodes: data.buttonCodes ?? data.buttons ?? [],
    defaultRouteKey: data.defaultRouteKey || firstRoutableMenu?.routeKey || '',
    defaultRoutePath:
      normalizeRoutePath(data.defaultRoutePath) || firstRoutableMenu?.routePath || config.fallbackDefaultRoutePath
  };
}

export async function fetchGetObjectContext(
  config: App.ObjectContext.DomainConfig,
  objectId: string
): Promise<ServiceRequestResult<Api.ObjectContext.ContextInfo>> {
  const result = await request<BackendObjectContextDTO>({
    ...safeJsonRequestConfig,
    url: createContextApiUrl(config, objectId),
    method: 'get',
    params:
      config.contextApiObjectIdPlacement === 'path'
        ? undefined
        : ({
            [config.contextApiObjectIdParamKey]: objectId
          } satisfies Record<string, LocationQueryValue | LocationQueryValue[]>)
  });

  if (result.error || !result.data) {
    return result as ServiceRequestResult<Api.ObjectContext.ContextInfo>;
  }

  return {
    ...result,
    data: normalizeObjectContext(config, objectId, result.data)
  };
}