import {z} from 'zod'

export type GetApiApiBudgetsComparisonArgs = {month?: (string | null) | undefined, 'X-Workspace-Id'?: (string | null) | undefined};

export type GetApiApiBudgetsComparisonOptions = {baseUrl: string, OAuth2PasswordBearer?: string | undefined, fetch?: typeof fetch | undefined};

export const budgetVsActual = z.object({category_id: z.string(), category_name: z.string(), category_icon: z.string(), category_color: z.string(), group_id: z.string().nullable().optional(), group_name: z.string().nullable().optional(), budget_amount: z.string().nullable().optional(), actual_amount: z.string(), projected_amount: z.string().optional(), prev_month_amount: z.string().optional(), projected_prev_month_amount: z.string().optional(), percentage_used: z.number().nullable().optional(), is_recurring: z.boolean().optional()});

export const getApiApiBudgetsComparisonResponse = z.array(budgetVsActual);

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
};

/**
 * Budget Comparison
 * 
 * GET /api/budgets/comparison
 */
export const getApiApiBudgetsComparison = async (args: GetApiApiBudgetsComparisonArgs, options: GetApiApiBudgetsComparisonOptions) => {
const {baseUrl, fetch: fetchFn = fetch, OAuth2PasswordBearer} = options ?? {}

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

if (args.month != null) query.append("month", String(args.month))
if (args['X-Workspace-Id'] != null) headers.set("X-Workspace-Id", String(args['X-Workspace-Id']))
if (OAuth2PasswordBearer !== undefined) headers.set('authorization', `Bearer ${OAuth2PasswordBearer}`)

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