import {z} from 'zod'

export type CourseCreateRequest = {title: string, short_description?: string | undefined, long_description_html?: string | undefined, enforce_sequential_navigation?: boolean | undefined, created_by_email?: (string | null) | undefined};

export type CourseCreateData = {type: 'courses', attributes: CourseCreateRequest};

export type CourseCreateRequestEnvelope = {data: Array<CourseCreateData>};

export type CreateApiV2CoursesArgs = {body: CourseCreateRequestEnvelope};

export type CreateApiV2CoursesOptions = {baseUrl: string, JWTAuth?: string | undefined, fetch?: typeof fetch | undefined};

export const courseAttributes = z.object({external_id: z.string(), title: z.string(), short_description: z.string(), long_description_html: z.string(), enforce_sequential_navigation: z.boolean(), lesson_count: z.number().int(), is_published: z.boolean(), promo_image_url: z.string(), average_rating: z.number().nullable().optional(), created_at: z.string(), modified_at: z.string()});

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

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

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 batchResultEnvelopeCourseResource = z.object({data: z.array(z.union([batchSucceededItemCourseResource, 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 courses
 * 
 * POST /v2/courses/
 */
export const createApiV2Courses = async (args: CreateApiV2CoursesArgs, options: CreateApiV2CoursesOptions) => {
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/courses/${query.size > 0 ? `?${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(batchResultEnvelopeCourseResource, await res.json())
};