import {z} from 'zod'

export type GetApiApiV1MetadataArgs = {format?: ('json' | 'csv' | 'jsonl') | undefined, headers?: string | undefined, pretty?: string | undefined};

export type GetApiApiV1MetadataOptions = {baseUrl: string, fetch?: typeof fetch | undefined};

export const getApiApiV1MetadataResponse = z.object({source: z.string(), generated_at: z.string(), model_count: z.number(), schema_version: z.string(), stats: z.object({providers: z.record(z.string(), z.number()), types: z.record(z.string(), z.number()), capabilities: z.record(z.string(), z.number()), deprecation: z.object({active: z.number(), deprecated: z.number()})})});

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
};

/**
 * Get models metadata
 * 
 * GET /api/v1/metadata
 */
export const getApiApiV1Metadata = async (args: GetApiApiV1MetadataArgs, options: GetApiApiV1MetadataOptions) => {
const {baseUrl, fetch: fetchFn = fetch} = options ?? {}

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

if (args.format != null) query.append("format", String(args.format))
if (args.headers != null) query.append("headers", String(args.headers))
if (args.pretty != null) query.append("pretty", String(args.pretty))

const url = `${baseUrl.replace(/\/+$/, '')}/api/v1/metadata${query.size > 0 ? `?${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(getApiApiV1MetadataResponse, await res.json())
};