import {z} from 'zod'

export type StudentCreateRequest = {email: string, first_name?: string | undefined, last_name?: string | undefined};

export type StudentCreateData = {type: 'students', attributes: StudentCreateRequest};

export type StudentCreateRequestEnvelope = {data: Array<StudentCreateData>};

export type CreateApiV2StudentsArgs = {body: StudentCreateRequestEnvelope};

export type CreateApiV2StudentsOptions = {baseUrl: string, JWTAuth?: string | undefined, fetch?: typeof fetch | undefined};

export const studentAttributes = z.object({email: z.string(), first_name: z.string(), last_name: z.string(), is_inactive: z.boolean(), external_id: z.string(), date_joined: z.string()});

export const studentResource = z.object({type: z.string().optional(), id: z.string(), attributes: studentAttributes, relationships: z.record(z.string(), z.unknown()).nullable().optional(), links: z.record(z.string(), z.unknown()).nullable().optional()});

export const batchSucceededItemStudentResource = z.object({status: z.literal("succeeded").optional(), id: z.string().nullable().optional(), result: studentResource});

export const batchItemError = z.object({code: z.enum(["duplicate_email", "duplicate_in_batch", "duplicate_name", "validation_error", "not_found", "internal_error", "not_in_domain", "already_enrolled", "already_published", "already_in_path"]), source: z.record(z.string(), z.unknown()).nullable().optional(), detail: z.string().nullable().optional()});

export const batchFailedItem = z.object({status: z.literal("failed").optional(), id: z.string().nullable().optional(), error: batchItemError});

export const batchSummary = z.object({total: z.number().int().gte(0), succeeded: z.number().int().gte(0), failed: z.number().int().gte(0)});

export const batchResultEnvelopeStudentResource = z.object({data: z.array(z.union([batchSucceededItemStudentResource, batchFailedItem])), summary: batchSummary});

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 students
 * 
 * POST /v2/students/
 */
export const createApiV2Students = async (args: CreateApiV2StudentsArgs, options: CreateApiV2StudentsOptions) => {
const {baseUrl, fetch: fetchFn = fetch, JWTAuth} = options ?? {}

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

if (JWTAuth !== undefined) headers.set('authorization', `Bearer ${JWTAuth}`)

const url = `${baseUrl.replace(/\/+$/, '')}/v2/students/${query.size > 0 ? `?${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(batchResultEnvelopeStudentResource, await res.json())
};