import {z} from 'zod'

export type PageLimit = number;

export type PageCursor = string;

export type BillStatusFilter = 'UNPAID' | 'PAID' | 'PARTIALLY_PAID' | 'CREDITED' | 'PARTIALLY_CREDITED' | 'APPLIED';

export type GetApiBillsArgs = {limit?: PageLimit | undefined, cursor?: PageCursor | undefined, subsidiary_id?: string | undefined, 'updated.gt'?: string | undefined, vendor_id?: string | undefined, status?: BillStatusFilter | undefined};

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

export const accountCode = z.string();

export const currencyCode = z.string();

export const roundedMonetaryAmount = z.object({amount: z.string(), currency: currencyCode});

export const countryCode = z.string();

export const expenseTaxRate = z.object({percentage: z.string(), tax_amount: roundedMonetaryAmount, country: countryCode, type: z.enum(["VAT", "SALES_TAX"]), description: z.string(), tax_code: z.string().optional(), coverage: z.enum(["INCLUSIVE", "EXCLUSIVE"])});

export const calendarPeriod = z.object({start: z.string(), end: z.string()});

export const fieldAssignments = z.array(z.object({field_id: z.string(), field_value_id: z.string()}));

export const externalReference = z.object({type: z.string(), id: z.string(), url: z.string().optional()});

export const exchangeRate = z.object({base: currencyCode, target: currencyCode, rate: z.string(), date: z.string()});

export const billStatus = z.enum(["DRAFT", "UNPAID", "PAID", "PARTIALLY_PAID", "CREDITED", "PARTIALLY_CREDITED", "APPLIED"]);

export const pendingApprovalRequest = z.object({id: z.string(), workflow_id: z.string(), operation: z.enum(["CREATE", "UPDATE", "DELETE"]), status: z.literal("PENDING")});

export const bill = z.object({vendor_id: z.string(), expense_number: z.string(), items: z.array(z.object({description: z.string().optional(), account_code: accountCode, amount: roundedMonetaryAmount, tax_rate: expenseTaxRate.optional(), service_period: calendarPeriod.optional(), fields: fieldAssignments.optional(), id: z.string()})), bill_date: z.string(), due_date: z.string(), impact_date: z.string().optional(), subsidiary_id: z.string().optional(), external_references: z.array(externalReference).optional(), exchange_rate: exchangeRate.optional(), metadata: z.record(z.string(), z.string().nullable()).optional(), id: z.string(), status: billStatus, pending_approval_request: pendingApprovalRequest.nullable().optional(), updated_at: z.string()});

export const pageCursor = z.string();

export const pagination = z.object({next_cursor: pageCursor.optional()});

export const getApiBillsResponse = z.object({bills: z.array(bill), pagination: pagination});

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
};

/**
 * Lists all bills
 * 
 * GET /bills
 */
export const getApiBills = async (args: GetApiBillsArgs, options?: GetApiBillsOptions) => {
const {baseUrl = "https://api.rillet.com", fetch: fetchFn = fetch, bearerAuth} = options ?? {}

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

if (args.limit != null) query.append("limit", String(args.limit))
if (args.cursor != null) query.append("cursor", String(args.cursor))
if (args.subsidiary_id != null) query.append("subsidiary_id", String(args.subsidiary_id))
if (args['updated.gt'] != null) query.append("updated.gt", String(args['updated.gt']))
if (args.vendor_id != null) query.append("vendor_id", String(args.vendor_id))
if (args.status != null) query.append("status", String(args.status))
if (bearerAuth !== undefined) headers.set('authorization', `Bearer ${bearerAuth}`)

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