import {z} from 'zod'

export type GetApiV1RegistrationDeathArgs = {forenames: string, surname: string, date: string};

export type GetApiV1RegistrationDeathOptions = {baseUrl?: string | undefined, bearerToken?: string | undefined, fetch?: typeof fetch | undefined};

export const v1Death = z.object({id: z.number().int(), date: z.string(), deceased: z.object({forenames: z.string(), surname: z.string(), dateOfBirth: z.string().optional(), dateOfDeath: z.string(), sex: z.enum(["Male", "Female", "Indeterminate"]), birthplace: z.string().optional(), deathplace: z.string().optional(), occupation: z.string().optional(), address: z.string().optional(), retired: z.boolean().optional(), maidenSurname: z.string().optional()}), status: z.object({blocked: z.boolean()})});

export const v1Deaths = z.array(v1Death);

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
};

/**
 * Search for death records
 * 
 * GET /v1/registration/death
 */
export const getApiV1RegistrationDeath = async (args: GetApiV1RegistrationDeathArgs, options?: GetApiV1RegistrationDeathOptions) => {
const {baseUrl = "https://api.lev.homeoffice.gov.uk", fetch: fetchFn = fetch, bearerToken} = options ?? {}

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

if (args.forenames != null) query.append("forenames", String(args.forenames))
if (args.surname != null) query.append("surname", String(args.surname))
if (args.date != null) query.append("date", String(args.date))
if (bearerToken !== undefined) headers.set('authorization', `Bearer ${bearerToken}`)

const url = `${baseUrl.replace(/\/+$/, '')}/v1/registration/death${query.size > 0 ? `?${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(v1Deaths, await res.json())
};