import {z} from 'zod'

export type UploadManifestFile = {path: string, size: number, contentType: string, hash: string};

export type CreatePublishSessionInput = {files: Array<UploadManifestFile>, tempId?: string | undefined, title?: string | undefined, spaMode?: boolean | undefined};

export type CreateApiPublishSessionsArgs = {'X-Tempmd-Client'?: string | undefined, 'Idempotency-Key': string, body: CreatePublishSessionInput};

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

export const publishSessionFile = z.object({fileId: z.string(), path: z.string(), size: z.number().int(), contentType: z.string(), hash: z.string(), status: z.enum(["expected", "uploaded"]), method: z.literal("PUT"), url: z.string(), headers: z.record(z.string(), z.string())});

export const publishSession = z.object({sessionId: z.string(), tempId: z.string(), versionId: z.string(), operation: z.enum(["create", "update"]), status: z.enum(["pending", "ready", "failed", "expired"]), uploadToken: z.string(), uploads: z.array(publishSessionFile), skipped: z.array(z.string()), finalizeUrl: z.string(), statusUrl: z.string(), expiresAt: 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
};

/**
 * Create or resume an idempotent upload session
 * 
 * POST /publish-sessions
 * 
 * Also accepts auth: tempCapability
 */
export const createApiPublishSessions = async (args: CreateApiPublishSessionsArgs, options?: CreateApiPublishSessionsOptions) => {
const {baseUrl = "https://api.temp.md", fetch: fetchFn = fetch, accountBearer} = options ?? {}

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

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

const url = `${baseUrl.replace(/\/+$/, '')}/publish-sessions${query.size > 0 ? `?${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(publishSession, await res.json())
};