import {z} from 'zod'

export type ExpenseRequestCreateRequest = {amount?: number | undefined, attachments?: Array<number> | undefined, billable?: boolean | undefined, category: number, date: string, details?: string | undefined, project?: string | undefined, quantity?: number | undefined, user?: number | undefined, type?: ('separate' | 'billable' | 'cost') | undefined};

export type CreateApiExpensesArgs = {body: ExpenseRequestCreateRequest};

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

export const attachmentDetails = z.object({id: z.number().optional(), name: z.string().optional(), token: z.string().optional()});

export const expense = z.object({amount: z.number().int().optional(), attachments: z.array(attachmentDetails).optional(), billable: z.boolean().optional(), category: z.number().optional(), date: z.string().optional(), details: z.string().optional(), id: z.number().optional(), project: z.string().optional(), quantity: z.number().optional(), user: z.number().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
};

/**
 * Create Expense
 * 
 * POST /expenses
 */
export const createApiExpenses = async (args: CreateApiExpensesArgs, options?: CreateApiExpensesOptions) => {
const {baseUrl = "https://api.everhour.com", fetch: fetchFn = fetch, ApiKeyAuth} = options ?? {}

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

if (ApiKeyAuth !== undefined) headers.set("X-Api-Key", ApiKeyAuth)

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