import {z} from 'zod'

export type ExecutionPolicy = 'local_only' | 'prefer_local' | 'cloud_allowed' | 'cloud_required';

export type CreateUploadRequest = {filename: string, media_type: string, byte_size: number, execution_policy: ExecutionPolicy};

export type CreateApiV1UploadsArgs = {'Idempotency-Key': string, body: CreateUploadRequest};

export type CreateApiV1UploadsOptions = {baseUrl?: string | undefined, bearerAuth?: string | undefined, fetch?: typeof fetch | undefined};

export const requestId = z.string();

export const runtimeLocation = z.enum(["local", "cloud"]);

export const execution = z.object({location: runtimeLocation, capability_id: z.string().nullable().optional(), capability_version: z.string().nullable().optional()});

export const usage = z.object({billable: z.boolean(), quantity: z.number().gte(0), unit: z.string(), credits: z.number().gte(0).optional()});

export const assetId = z.string();

export const uploadSession = z.object({id: z.string(), asset_id: assetId, method: z.enum(["PUT", "POST"]), upload_url: z.string(), expires_at: z.string()});

export const uploadResponse = z.object({request_id: requestId, execution: execution, usage: usage, warnings: z.array(z.string()), data: uploadSession});

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
};

/**
 * Create an isomorphic local or cloud upload session
 * 
 * POST /v1/uploads
 * 
 * Also accepts auth: apiKeyAuth
 */
export const createApiV1Uploads = async (args: CreateApiV1UploadsArgs, options?: CreateApiV1UploadsOptions) => {
const {baseUrl = "https://api.cerul.ai", fetch: fetchFn = fetch, bearerAuth} = options ?? {}

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

if (args['Idempotency-Key'] != null) headers.set("Idempotency-Key", String(args['Idempotency-Key']))
if (bearerAuth !== undefined) headers.set('authorization', `Bearer ${bearerAuth}`)

const url = `${baseUrl.replace(/\/+$/, '')}/v1/uploads${query.size > 0 ? `?${query}` : ''}`

const res = await fetchFn(url, {method: "POST", headers, body: JSON.stringify(args.body)})

if (!res.ok) throw new Error(`Request failed with status ${res.status}`, {cause: {status: res.status, body: await res.text()}})

return validateResponse(uploadResponse, await res.json())
};