import {z} from 'zod'

export type GetApiV2CampaignsCampaignIdSplitTestArgs = {campaignId: number};

export type GetApiV2CampaignsCampaignIdSplitTestOptions = {baseUrl?: string | undefined, fetch?: typeof fetch | undefined};

export const apiSplitTestResult = z.object({subjectLine: z.string().nullable().optional(), fromName: z.string().nullable().optional(), fromAddress: z.string().nullable().optional(), htmlContent: z.string().nullable().optional(), plainTextContent: z.string().nullable().optional(), version: z.string().nullable().optional(), winningVersion: z.boolean().optional(), resultsActual: z.number().optional(), resultsPercentage: z.number().optional()});

export const apiSplitTestMetrics = z.enum(["Opens", "Clicks", "ROI", "NotAvailableInThisVersion"]);

export const apiCampaignSplitTestResults = z.object({versions: z.array(apiSplitTestResult).nullable().optional(), splitTestWinnerMetric: apiSplitTestMetrics.optional()});

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
};

/**
 * Gets the split test results of a given campaign.
 * 
 * GET /v2/campaigns/{campaignId}/split-test
 */
export const getApiV2CampaignsCampaignIdSplitTest = async (args: GetApiV2CampaignsCampaignIdSplitTestArgs, options?: GetApiV2CampaignsCampaignIdSplitTestOptions) => {
const {baseUrl = "https://api.dotdigital.com", fetch: fetchFn = fetch} = options ?? {}

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

const url = `${baseUrl.replace(/\/+$/, '')}/v2/campaigns/${encodeURIComponent(String(args.campaignId))}/split-test${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(apiCampaignSplitTestResults, await res.json())
};