import {z} from 'zod'

export type ConsentFramework = 'GDPR' | 'PDPO';

export type ConsentLegalBasis = 'CONSENT' | 'CONTRACT' | 'LEGAL_OBLIGATION' | 'VITAL_INTEREST' | 'PUBLIC_TASK' | 'LEGITIMATE_INTEREST';

export type SystemConsentPurpose = 'RECRUITING' | 'MARKETING_EMAIL' | 'MARKETING_SMS' | 'WHATSAPP_BUSINESS_UTILITY' | 'WHATSAPP_BUSINESS_MARKETING';

export type ConsentPurposeRequestDto = {type: 'system', name: SystemConsentPurpose} | {type: 'custom', id: string};

export type DateISO = string;

export type CreateConsentDto = {candidateId: string, framework: ConsentFramework | null, legalBasis: ConsentLegalBasis, purpose: ConsentPurposeRequestDto, comments: string | null, receivedAt: DateISO, validUntil: DateISO};

export type CreateApiConsentsArgs = {body: CreateConsentDto};

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

export const createRecordResponseDto = z.object({id: z.string().min(1)});

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 consent
 * 
 * POST /consents
 */
export const createApiConsents = async (args: CreateApiConsentsArgs, options: CreateApiConsentsOptions) => {
const {baseUrl, fetch: fetchFn = fetch, xApiKey} = options ?? {}

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

if (xApiKey !== undefined) headers.set("x-api-key", xApiKey)

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