import {z} from 'zod'

export type GetApiV3ObligationsArgs = {page: number, limit: number, filter?: string | undefined};

export type GetApiV3ObligationsOptions = {baseUrl?: string | undefined, customHeader?: string | undefined, fetch?: typeof fetch | undefined};

export const pricingTierDto = z.object({tier: z.number(), amount: z.number(), amountType: z.enum(["PER_ITEM", "TOTAL_INVOICE"]), tierMinimum: z.number()});

export const billingScheduleDto = z.object({name: z.string(), description: z.string().optional(), startDate: z.string(), endDate: z.string(), duration: z.number().optional(), isArrears: z.boolean().optional(), invoiceDateStrategy: z.enum(["FIRST_OF_PERIOD", "LAST_OF_PERIOD", "ARREARS", "ADVANCED_DUE_START"]).optional(), isRecurring: z.boolean(), includeInArr: z.boolean().optional(), interval: z.enum(["NONE", "DAY", "MONTH", "HOUR", "YEAR", "QUARTER", "SEMI_MONTH", "WEEK"]), intervalFrequency: z.number(), netPaymentTerms: z.number(), quantity: z.number(), billingType: z.enum(["UNIT", "FLAT"]), pricingType: z.enum(["SIMPLE", "TIERED", "VOLUME"]), eventTypeId: z.string().optional(), itemId: z.string().optional(), productId: z.string().nullable().optional(), invoiceType: z.enum(["INVOICE", "BILL"]), pricing: z.array(pricingTierDto), classId: z.string().optional(), departmentId: z.string().optional(), projectId: z.string().optional()});

export const recognizedRevenueDto = z.object({timeframe: z.string(), total: z.number(), booksClosed: z.boolean()});

export const revenueScheduleDto = z.object({categoryId: z.string().optional(), recognizedRevenue: z.array(recognizedRevenueDto)});

export const discountDto = z.object({type: z.enum(["PERCENTAGE", "FIXED"]).optional(), amount: z.string().optional(), note: z.string().optional()});

export const seatBasedObligationConfigDto = z.object({isMovingMinimum: z.boolean(), minQuantity: z.number(), defaultProrationPolicy: z.enum(["NONE", "DAY", "MONTH", "YEAR"]), defaultTrueUpTiming: z.enum(["IMMEDIATE", "CO_TERM"])});

export const obligationDto = z.object({id: z.string(), contractId: z.string(), serviceStartDate: z.string(), serviceEndDate: z.string(), categoryId: z.string().optional(), billingSchedule: billingScheduleDto, revenueSchedule: revenueScheduleDto, discount: discountDto.optional(), seatConfig: seatBasedObligationConfigDto.optional()});

export const integratorsApiError = z.object({code: z.number(), message: z.string(), details: z.object({}).optional()});

export const getApiV3ObligationsResponse = z.object({payload: z.object({data: z.array(obligationDto).optional(), limit: z.number().optional(), totalItems: z.number().optional(), currentPage: z.number().optional()}), success: z.boolean(), message: z.string(), error: integratorsApiError});

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
};

/**
 * List obligations
 * 
 * GET /v3/obligations
 */
export const getApiV3Obligations = async (args: GetApiV3ObligationsArgs, options?: GetApiV3ObligationsOptions) => {
const {baseUrl = "https://integrators.prod.api.tabsplatform.com", fetch: fetchFn = fetch, customHeader} = options ?? {}

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

if (args.page != null) query.append("page", String(args.page))
if (args.limit != null) query.append("limit", String(args.limit))
if (args.filter != null) query.append("filter", String(args.filter))
if (customHeader !== undefined) headers.set("Authorization", customHeader)

const url = `${baseUrl.replace(/\/+$/, '')}/v3/obligations${query.size > 0 ? `?${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(getApiV3ObligationsResponse, await res.json())
};