import {z} from 'zod'

export type AiGatewayBudgetInstanceSort = 'spend_desc' | 'spend_asc' | 'key_asc';

export type GetApiApiV2BudgetsIdInstancesArgs = {id: string, window?: string | undefined, split_dim?: Array<string> | undefined, sort?: AiGatewayBudgetInstanceSort | undefined, limit?: number | undefined, offset?: number | undefined};

export type GetApiApiV2BudgetsIdInstancesOptions = {baseUrl?: string | undefined, apiKeyAuth?: string | undefined, appKeyAuth?: string | undefined, fetch?: typeof fetch | undefined};

export const aiGatewayBudgetInstanceAttributes = z.object({budget_id: z.string(), effective_capacity_microcents: z.number().int(), instance_key: z.string(), modified_at: z.string(), spend_microcents: z.number().int(), split_dims: z.record(z.string(), z.string()), window_start: z.string()});

export const aiGatewayBudgetInstanceType = z.literal("budget-instances");

export const aiGatewayBudgetInstanceResource = z.object({attributes: aiGatewayBudgetInstanceAttributes, id: z.string(), type: aiGatewayBudgetInstanceType});

export const aiGatewayRestrictedDetailsMeta = z.object({restricted_details: z.boolean()});

export const aiGatewayBudgetInstanceListResponse = z.object({data: z.array(aiGatewayBudgetInstanceResource), meta: aiGatewayRestrictedDetailsMeta});

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 AI Gateway budget instances
 * 
 * GET /api/v2/budgets/{id}/instances
 * 
 * Also accepts auth: AuthZ
 */
export const getApiApiV2BudgetsIdInstances = async (args: GetApiApiV2BudgetsIdInstancesArgs, options?: GetApiApiV2BudgetsIdInstancesOptions) => {
const {baseUrl = "https://api.datadoghq.com", fetch: fetchFn = fetch, apiKeyAuth, appKeyAuth} = options ?? {}

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

if (args.window != null) query.append("window", String(args.window))
for (const item of args.split_dim ?? []) query.append("split_dim", String(item))
if (args.sort != null) query.append("sort", String(args.sort))
if (args.limit != null) query.append("limit", String(args.limit))
if (args.offset != null) query.append("offset", String(args.offset))
if (apiKeyAuth !== undefined) headers.set("DD-API-KEY", apiKeyAuth)
if (appKeyAuth !== undefined) headers.set("DD-APPLICATION-KEY", appKeyAuth)

const url = `${baseUrl.replace(/\/+$/, '')}/api/v2/budgets/${encodeURIComponent(String(args.id))}/instances${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(aiGatewayBudgetInstanceListResponse, await res.json())
};