import {z} from 'zod'

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

export const themeColors = z.object({light: z.string(), dark: z.string()});

export const symbol = z.object({label: z.string().optional(), color: z.union([z.string(), themeColors]).optional(), icon: z.string().optional()});

export const studentCareer = z.object({state: symbol, degreeId: z.string(), degreeCode: z.string(), degreeLevel: z.string(), degreeName: z.string(), firstEnrollmentYear: z.number().int(), lastEnrollmentYear: z.number().int(), isCurrentlyEnrolled: z.boolean(), averageGrade: z.number().nullable(), estimatedFinalGrade: z.number().nullable(), isFinalGradePurged: z.boolean(), mastersAdmissionAverageGrade: z.number().nullable(), totalOnTimeExamPoints: z.number().nullable(), maxOnTimeExamPoints: z.number(), excludedCreditsNumber: z.number().nullable(), totalCredits: z.number().int(), totalAttendedCredits: z.number().int(), totalAcquiredCredits: z.number().int(), enrollmentCredits: z.number().int(), enrollmentAttendedCredits: z.number().int(), enrollmentAcquiredCredits: z.number().int()});

export const getApiStudentCareerResponse = z.object({data: studentCareer});

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
};

/**
 * Retrieve student career | Recupera la cariera dello studente
 * 
 * GET /student/career
 */
export const getApiStudentCareer = async (options?: GetApiStudentCareerOptions) => {
const {baseUrl = "https://app.didattica.polito.it/api", fetch: fetchFn = fetch, BearerAuth} = options ?? {}

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

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

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