import {z} from 'zod'

export type GetApiStatementsArgs = {customer_id?: string | undefined, ref_ids?: Array<string> | undefined, statement_ids?: Array<string> | undefined, statuses?: (Array<'STATEMENT_STATUS_UNSPECIFIED' | 'STATEMENT_STATUS_INITIATED' | 'STATEMENT_STATUS_GENERATED' | 'STATEMENT_STATUS_PAID'>) | undefined, limit?: number | undefined, order?: ('DESC' | 'ASC') | undefined, page_cursor?: string | undefined};

export type GetApiStatementsOptions = {baseUrl?: string | undefined, OAuth2?: string | undefined, fetch?: typeof fetch | undefined};

export const statementType = z.enum(["STATEMENT_TYPE_UNSPECIFIED", "STATEMENT_TYPE_USDG_REWARD"]);

export const product = z.literal("USDG_REWARDS");

export const statementStatus = z.enum(["STATEMENT_STATUS_UNSPECIFIED", "STATEMENT_STATUS_INITIATED", "STATEMENT_STATUS_GENERATED", "STATEMENT_STATUS_PAID"]);

export const statementBalance = z.object({asset: z.string().optional(), amount_paid: z.string().optional(), total_amount_owed: z.string().optional(), next_payment_ref_id: z.string().optional()});

export const statementFile = z.object({format: z.string().optional(), url: z.string().optional(), expires_at: z.string().optional(), generated_at: z.string().optional()});

export const bufAny = z.object({"@type": z.string().optional()}).and(z.record(z.string(), z.unknown()));

export const statement = z.object({id: z.string().optional(), ref_id: z.string().optional(), customer_id: z.string().optional(), type: statementType.optional(), product: product.optional(), status: statementStatus.optional(), metadata: z.record(z.string(), z.string()).optional(), statement_balances: z.array(statementBalance).optional(), period_start: z.string().optional(), period_end: z.string().optional(), generated_at: z.string().optional(), paid_at: z.string().optional(), created_at: z.string().optional(), statement_group_id: z.string().optional(), version: z.number().int().optional(), files: z.array(statementFile).optional(), data: bufAny.optional()});

export const listStatementsResponse = z.object({statements: z.array(statement).optional(), next_page_cursor: 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
};

/**
 * List Statements
 * 
 * GET /statements
 */
export const getApiStatements = async (args: GetApiStatementsArgs, options?: GetApiStatementsOptions) => {
const {baseUrl = "https://api.paxos.com/v2", fetch: fetchFn = fetch, OAuth2} = options ?? {}

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

if (args.customer_id != null) query.append("customer_id", String(args.customer_id))
for (const item of args.ref_ids ?? []) query.append("ref_ids", String(item))
for (const item of args.statement_ids ?? []) query.append("statement_ids", String(item))
for (const item of args.statuses ?? []) query.append("statuses", String(item))
if (args.limit != null) query.append("limit", String(args.limit))
if (args.order != null) query.append("order", String(args.order))
if (args.page_cursor != null) query.append("page_cursor", String(args.page_cursor))
if (OAuth2 !== undefined) headers.set('authorization', `Bearer ${OAuth2}`)

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