import {z} from 'zod'

export type PracticeProblem = {problem_type: 'mcq' | 'frq' | 'selectall', problem_statement: string, correct_answer?: (string | Array<string> | null) | undefined, difficulty?: ('easy' | 'medium' | 'hard') | undefined, answer_choices?: ({[key: string]: string} | null) | undefined, explanation?: (string | null) | undefined, scoring_details?: (string | null) | undefined, include_graph?: boolean | undefined, graph_description?: (string | null) | undefined, graph_url?: (string | null) | undefined, user_answer?: (string | Array<string> | null) | undefined};

export type GradeFRQRequest = {problem: PracticeProblem};

export type CreateApiV1InteractivesPracticeGradeArgs = {body: GradeFRQRequest};

export type CreateApiV1InteractivesPracticeGradeOptions = {baseUrl: string, HTTPBearer?: string | undefined, fetch?: typeof fetch | undefined};

export const gradeFRQResponse = z.object({success: z.boolean(), timestamp: z.string(), score: z.number().int(), explanation: z.string(), max_score: z.number().int(), percentage: z.number()});

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
};

/**
 * Grade Practice
 * 
 * POST /v1/interactives/practice/grade
 */
export const createApiV1InteractivesPracticeGrade = async (args: CreateApiV1InteractivesPracticeGradeArgs, options: CreateApiV1InteractivesPracticeGradeOptions) => {
const {baseUrl, fetch: fetchFn = fetch, HTTPBearer} = options ?? {}

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

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

const url = `${baseUrl.replace(/\/+$/, '')}/v1/interactives/practice/grade${query.size > 0 ? `?${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(gradeFRQResponse, await res.json())
};