import {z} from 'zod'

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

export const section = z.object({sectionId: z.string().optional(), sectionTitle: z.string().optional(), sectionStatus: z.string().optional(), questionIds: z.array(z.string()).optional()});

export const submission = z.object({grantSchemeId: z.string().optional(), grantApplicationId: z.string().optional(), grantSubmissionId: z.string().optional(), applicationName: z.string().optional(), submissionStatus: z.enum(["IN_PROGRESS", "SUBMITTED", "UNDER_REVIEW", "AWARDED", "NOT_AWARDED", "WITHDRAWN"]).optional(), sections: z.array(section).optional()});

export const getApiSubmissionsResponse = z.array(submission);

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
};

/**
 * Returns a list of an applicant's submissions to grant schemes.
 * 
 * GET /submissions
 */
export const getApiSubmissions = async (options?: GetApiSubmissionsOptions) => {
const {baseUrl = "http://localhost:8080", fetch: fetchFn = fetch} = options ?? {}

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

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