import {z} from 'zod'

export type GetApiV1MetaFieldsOptions = {baseUrl?: string | undefined, fetch?: typeof fetch | undefined};

export const billing = z.object({currency: z.literal("USD"), price_usd: z.string(), unit: z.string()});

export const jsonValue = z.unknown();

export const fetchCatalogField = z.object({billing: billing, derivation: z.record(z.string(), jsonValue).nullable(), description: z.string(), interpretation_hints: z.string().nullable(), layer: z.string(), name: z.string(), null_meaning: z.string().nullable(), nullable: z.boolean(), presets: z.array(z.string()), source: z.string().nullable(), source_url: z.string().nullable(), ttl_seconds: z.number().int().nullable(), type: z.string(), unit: z.string().nullable()});

export const fetchCatalogResponse = z.object({billing: billing, contract: z.string(), fields: z.array(fetchCatalogField), presets: z.record(z.string(), z.array(z.string())), us_envelope: z.record(z.string(), z.number()), version: z.string()});

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
};

/**
 * List Fetch fields
 * 
 * GET /v1/meta/fields
 */
export const getApiV1MetaFields = async (options?: GetApiV1MetaFieldsOptions) => {
const {baseUrl = "https://api.mireye.com", fetch: fetchFn = fetch} = options ?? {}

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

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