import {z} from 'zod'

export type GetApiApiV2BudgetsOptions = {baseUrl?: string | undefined, apiKeyAuth?: string | undefined, appKeyAuth?: string | undefined, fetch?: typeof fetch | undefined};

export const aiGatewayBudgetEnforcement = z.enum(["BLOCK", "NOTIFY"]);

export const aiGatewayBudgetSelectorEntry = z.object({dim: z.string(), per_value: z.boolean(), values: z.array(z.string()).optional()});

export const aiGatewayBudgetSelector = z.array(aiGatewayBudgetSelectorEntry).nullable();

export const aiGatewayBudgetTags = z.record(z.string(), z.string());

export const aiGatewayBudgetWindowPolicy = z.enum(["DAILY", "WEEKLY", "MONTHLY"]);

export const aiGatewayBudgetListAttributes = z.object({capacity_microcents: z.number().int(), created_at: z.string(), created_by: z.string(), current_period_capacity_microcents: z.number().int(), current_spend_microcents: z.number().int(), enabled: z.boolean(), enforcement: aiGatewayBudgetEnforcement, monitor_id: z.number().int().nullable(), name: z.string(), scope_restricted: z.boolean(), selector: aiGatewayBudgetSelector.optional(), tags: aiGatewayBudgetTags, team_id: z.string().optional(), updated_at: z.string(), user_id: z.string().optional(), warning_threshold: z.number(), window_end: z.string(), window_policy: aiGatewayBudgetWindowPolicy, window_start: z.string()});

export const aiGatewayBudgetType = z.literal("budgets");

export const aiGatewayBudgetListResource = z.object({attributes: aiGatewayBudgetListAttributes, id: z.string(), type: aiGatewayBudgetType});

export const aiGatewayBudgetListResponse = z.object({data: z.array(aiGatewayBudgetListResource)});

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 budgets
 * 
 * GET /api/v2/budgets
 * 
 * Also accepts auth: AuthZ
 */
export const getApiApiV2Budgets = async (options?: GetApiApiV2BudgetsOptions) => {
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 (apiKeyAuth !== undefined) headers.set("DD-API-KEY", apiKeyAuth)
if (appKeyAuth !== undefined) headers.set("DD-APPLICATION-KEY", appKeyAuth)

const url = `${baseUrl.replace(/\/+$/, '')}/api/v2/budgets${query.size > 0 ? `?${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(aiGatewayBudgetListResponse, await res.json())
};