import {z} from 'zod'

export type SchedulePreviewHumaRequest = {annualInterestRate: string, dayCountConvention: string, gracePeriodDays?: number | undefined, jurisdictionCode: string, principalAmount: string, startDate: string, termMonths: number};

export type CreateApiApiV1LoanApplicationsPreviewScheduleArgs = {body: SchedulePreviewHumaRequest};

export type CreateApiApiV1LoanApplicationsPreviewScheduleOptions = {baseUrl?: string | undefined, fetch?: typeof fetch | undefined};

export const schedulePreviewHumaEffectiveCost = z.object({effectiveCostAnnualPct: z.string(), effectiveCostMonthlyPct: z.string(), memoryOfCalculation: z.record(z.string(), z.unknown()), methodId: z.string(), rateTableSnapshot: z.record(z.string(), z.unknown())});

export const schedulePreviewHumaInstallmentLine = z.object({dueDate: z.string(), interestAmount: z.string(), number: z.number().int(), principalAmount: z.string(), remainingBalance: z.string(), totalAmount: z.string()});

export const schedulePreviewHumaJurisdictionExtensions = z.object({body: z.record(z.string(), z.unknown()), overlayKey: z.string()});

export const schedulePreviewHumaBody = z.object({calendarReference: z.string(), dayCountConvention: z.string(), effectiveCostPreview: schedulePreviewHumaEffectiveCost.optional(), installments: z.array(schedulePreviewHumaInstallmentLine).nullable(), jurisdictionCode: z.string(), jurisdictionExtensions: schedulePreviewHumaJurisdictionExtensions.optional(), profileVersion: z.string(), totalInterest: z.string(), totalPrincipal: z.string()});

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
};

/**
 * Preview amortisation schedule
 * 
 * POST /api/v1/loan-applications/preview-schedule
 */
export const createApiApiV1LoanApplicationsPreviewSchedule = async (args: CreateApiApiV1LoanApplicationsPreviewScheduleArgs, options?: CreateApiApiV1LoanApplicationsPreviewScheduleOptions) => {
const {baseUrl = "https://identity.sandbox.lerian.net", fetch: fetchFn = fetch} = options ?? {}

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

const url = `${baseUrl.replace(/\/+$/, '')}/api/v1/loan-applications/preview-schedule${query.size > 0 ? `?${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(schedulePreviewHumaBody, await res.json())
};