import {z} from 'zod'

export type GetApiProvidersCatalogArgs = {keys?: string | undefined, name?: string | undefined, channel?: string | undefined};

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

export const paging = z.object({cursor: z.string().nullable().optional(), more: z.boolean()});

export const providerSchemaField = z.object({type: z.string(), required: z.boolean(), values: z.array(z.string()).optional()});

export const providersCatalogEntry = z.object({provider: z.string(), name: z.string(), description: z.string(), channel: z.string(), settings: z.record(z.string(), providerSchemaField)});

export const providersCatalogResponse = z.object({paging: paging, results: z.array(providersCatalogEntry)});

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 available provider types
 * 
 * GET /providers/catalog
 */
export const getApiProvidersCatalog = async (args: GetApiProvidersCatalogArgs, options?: GetApiProvidersCatalogOptions) => {
const {baseUrl = "https://api.courier.com", fetch: fetchFn = fetch, BearerAuth} = options ?? {}

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

if (args.keys != null) query.append("keys", String(args.keys))
if (args.name != null) query.append("name", String(args.name))
if (args.channel != null) query.append("channel", String(args.channel))
if (BearerAuth !== undefined) headers.set('authorization', `Bearer ${BearerAuth}`)

const url = `${baseUrl.replace(/\/+$/, '')}/providers/catalog${query.size > 0 ? `?${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(providersCatalogResponse, await res.json())
};