import {z} from 'zod'

export type GetApiSettlementsArgs = {from?: number | undefined, to?: number | undefined, count?: number | undefined, skip?: number | undefined};

export type GetApiSettlementsOptions = {baseUrl?: string | undefined, basicAuth?: {username: string, password: string} | undefined, fetch?: typeof fetch | undefined};

export const settlement = z.object({id: z.string().optional(), entity: z.literal("settlement").optional(), amount: z.number().int().optional(), status: z.enum(["created", "processed", "failed"]).optional(), fees: z.number().int().optional(), tax: z.number().int().optional(), utr: z.string().optional(), created_at: z.number().int().optional()});

export const getApiSettlementsResponse = z.object({entity: z.literal("collection").optional(), count: z.number().int().optional(), items: z.array(settlement).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
};

/**
 * Fetch all settlements
 * 
 * GET /settlements
 * 
 * Also accepts auth: oauth2
 */
export const getApiSettlements = async (args: GetApiSettlementsArgs, options?: GetApiSettlementsOptions) => {
const {baseUrl = "https://api.razorpay.com/v1", fetch: fetchFn = fetch, basicAuth} = options ?? {}

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

if (args.from != null) query.append("from", String(args.from))
if (args.to != null) query.append("to", String(args.to))
if (args.count != null) query.append("count", String(args.count))
if (args.skip != null) query.append("skip", String(args.skip))
if (basicAuth !== undefined) headers.set('authorization', `Basic ${btoa(`${basicAuth.username}:${basicAuth.password}`)}`)

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