import {z} from 'zod'

export type GetApiChangeLogsDateArgs = {date: string, search?: string | undefined, title?: string | undefined, type?: string | undefined, page?: number | undefined, Accept: 'application/json'};

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

export const changeLogs = z.object({data: z.array(z.object({body: z.string(), date: z.string(), details: z.string(), display_banner: z.boolean(), heading: z.string(), high_priority: z.boolean(), id: z.string(), applicable_to: z.array(z.enum(["UK", "England", "England regions", "England UTLAs", "England LTLAs", "England MSOAs", "Scotland", "Scotland local authorities", "Northern Ireland", "Northern Ireland local authorities", "Wales local authorities", "All NHS regions", "All NHS trusts", "Unspecified"])), metrics: z.array(z.object({metric: z.string(), metric_name: z.string()})), page: z.object({title: z.string().optional(), uri: z.string().optional()}), type: z.string()})).optional(), length: z.number().int().optional(), page: z.number().int().optional(), total_length: z.number().int().optional(), total_pages: z.number().int().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
};

/**
 * Change logs: dated
 * 
 * GET /change_logs/{date}
 */
export const getApiChangeLogsDate = async (args: GetApiChangeLogsDateArgs, options?: GetApiChangeLogsDateOptions) => {
const {baseUrl = "https://api.coronavirus.data.gov.uk/generic", fetch: fetchFn = fetch} = options ?? {}

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

if (args.search != null) query.append("search", String(args.search))
if (args.title != null) query.append("title", String(args.title))
if (args.type != null) query.append("type", String(args.type))
if (args.page != null) query.append("page", String(args.page))
if (args.Accept != null) headers.set("Accept", String(args.Accept))

const url = `${baseUrl.replace(/\/+$/, '')}/change_logs/${encodeURIComponent(String(args.date))}${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(changeLogs, await res.json())
};