import {z} from 'zod'

export type ExpenseSource = number;

export type GetApiExpensesArgs = {startDate?: string | undefined, endDate?: string | undefined, category?: string | undefined, source?: ExpenseSource | undefined};

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

export const expenseSource = z.number().int();

export const expenseDto = z.object({id: z.string().optional(), amount: z.union([z.number(), z.string()]).optional(), category: z.string().optional(), date: z.string().optional(), description: z.string().nullable().optional(), vendorName: z.string().nullable().optional(), referenceNumber: z.string().nullable().optional(), source: expenseSource.optional(), sourceReferenceId: z.string().nullable().optional(), recurringExpenseId: z.string().nullable().optional(), createdById: z.string().nullable().optional(), createdByName: z.string().nullable().optional(), createdAt: z.string().optional(), updatedAt: z.string().optional()});

export const expenseListResponseDto = z.object({items: z.array(expenseDto).optional(), total: z.union([z.number().int(), z.string()]).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
};

/**
 * Get expenses for a date range with optional filters
 * 
 * GET /Expenses
 */
export const getApiExpenses = async (args: GetApiExpensesArgs, options?: GetApiExpensesOptions) => {
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.startDate != null) query.append("startDate", String(args.startDate))
if (args.endDate != null) query.append("endDate", String(args.endDate))
if (args.category != null) query.append("category", String(args.category))
if (args.source != null) query.append("source", String(args.source))
if (Bearer !== undefined) headers.set('authorization', `Bearer ${Bearer}`)

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