import {z} from 'zod'

export type CreateApiMetricsDvmProductionProviderIdDiagnosisArgs = {providerId: string, period?: string | undefined};

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

export const dvmDiagnosisDto = z.object({providerId: z.string().optional(), period: z.string().optional(), diagnosis: z.string().optional(), isLlmGenerated: z.boolean().optional(), generatedAt: z.string().optional()});

export const businessMetricsResponseDtoOfDvmDiagnosisDto = z.object({success: z.boolean().optional(), data: dvmDiagnosisDto.nullable().optional(), error: z.string().nullable().optional(), message: z.string().nullable().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
};

/**
 * AI root-cause diagnosis for one provider's DVM Production drill-down (PAW-576).
 * POST since it may trigger an LLM call; the result is cached server-side.
 * 
 * POST /Metrics/dvm-production/{providerId}/diagnosis
 */
export const createApiMetricsDvmProductionProviderIdDiagnosis = async (args: CreateApiMetricsDvmProductionProviderIdDiagnosisArgs, options?: CreateApiMetricsDvmProductionProviderIdDiagnosisOptions) => {
const {baseUrl = "https://api.clinicos.vet/backend/business", fetch: fetchFn = fetch, Bearer} = options ?? {}

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

if (args.period != null) query.append("period", String(args.period))
if (Bearer !== undefined) headers.set('authorization', `Bearer ${Bearer}`)

const url = `${baseUrl.replace(/\/+$/, '')}/Metrics/dvm-production/${encodeURIComponent(String(args.providerId))}/diagnosis${query.size > 0 ? `?${query}` : ''}`

const res = await fetchFn(url, {method: "POST", headers})

if (!res.ok) throw new Error(`Request failed with status ${res.status}`, {cause: {status: res.status, body: await res.text()}})

return validateResponse(businessMetricsResponseDtoOfDvmDiagnosisDto, await res.json())
};