import {z} from 'zod'

export type GetApiItemsItemnameArgs = {'Accept-Language'?: string | undefined, metadata?: string | undefined, recursive?: boolean | undefined, itemname: string};

export type GetApiItemsItemnameOptions = {baseUrl: string, fetch?: typeof fetch | undefined};

export const stateOption = z.object({value: z.string().optional(), label: z.string().optional()});

export const stateDescription = z.object({minimum: z.number().optional(), maximum: z.number().optional(), step: z.number().optional(), pattern: z.string().optional(), readOnly: z.boolean().optional(), options: z.array(stateOption).optional()});

export const commandOption = z.object({command: z.string().optional(), label: z.string().optional()});

export const commandDescription = z.object({commandOptions: z.array(commandOption).optional()});

export const enrichedItemDTO = z.object({type: z.string().optional(), name: z.string().optional(), label: z.string().optional(), category: z.string().optional(), tags: z.array(z.string()).optional(), groupNames: z.array(z.string()).optional(), link: z.string().optional(), state: z.string().optional(), transformedState: z.string().optional(), stateDescription: stateDescription.optional(), unitSymbol: z.string().optional(), commandDescription: commandDescription.optional(), metadata: z.record(z.string(), z.object({})).optional(), editable: z.boolean().optional(), groupType: z.string().optional()});

export const validateResponse = async <Output>(
  schema: {
    readonly '~standard': {
      readonly validate: (value: unknown) => ({ readonly value: Output; readonly issues?: undefined } | { readonly issues: ReadonlyArray<{ readonly message: string; readonly path?: ReadonlyArray<PropertyKey | { readonly key: PropertyKey }> | undefined }> }) | Promise<{ readonly value: Output; readonly issues?: undefined } | { readonly issues: ReadonlyArray<{ readonly message: string; readonly path?: ReadonlyArray<PropertyKey | { readonly key: PropertyKey }> | undefined }> }>
    }
  },
  value: unknown
): Promise<Output> => {
  const result = await schema['~standard'].validate(value)

  if (result.issues !== undefined) {
    const detail = result.issues
      .map(({ message, path }) =>
        path?.length
          ? `${path.map((segment) => String(typeof segment === 'object' ? segment.key : segment)).join('.')}: ${message}`
          : message
      )
      .join('; ')

    throw new Error(`Response does not match the schema: ${detail}`, { cause: { issues: result.issues } })
  }

  return result.value
};

/**
 * Gets a single item.
 * 
 * GET /items/{itemname}
 */
export const getApiItemsItemname = async (args: GetApiItemsItemnameArgs, options: GetApiItemsItemnameOptions) => {
const {baseUrl, fetch: fetchFn = fetch} = options ?? {}

const query = new URLSearchParams()
const headers = new Headers()
headers.set('accept', "application/json")

if (args['Accept-Language'] != null) headers.set("Accept-Language", String(args['Accept-Language']))
if (args.metadata != null) query.append("metadata", String(args.metadata))
if (args.recursive != null) query.append("recursive", String(args.recursive))

const url = `${baseUrl.replace(/\/+$/, '')}/items/${encodeURIComponent(String(args.itemname))}${query.size > 0 ? `?${query}` : ''}`

const res = await fetchFn(url, {method: "GET", headers})

if (!res.ok) throw new Error(`Request failed with status ${res.status}`, {cause: {status: res.status, body: await res.text()}})

return validateResponse(enrichedItemDTO, await res.json())
};