import {z} from 'zod'

export type GetApiApiV2PoliciesInboundArgs = {inbound: string, user_id?: string | undefined};

export type GetApiApiV2PoliciesInboundOptions = {baseUrl?: string | undefined, apiKeyAuth?: string | undefined, appKeyAuth?: string | undefined, fetch?: typeof fetch | undefined};

export const aiGatewayPolicyTarget = z.object({id: z.number().int().gte(1), model: z.string().optional(), priority: z.number().int(), provider: z.string().nullable().optional()});

export const aiGatewayPolicyTier = z.object({targets: z.array(aiGatewayPolicyTarget)});

export const aiGatewayPolicyAttributes = z.object({priority: z.number().int(), tiers: z.array(aiGatewayPolicyTier)});

export const aiGatewayPolicyType = z.literal("routing-documents");

export const aiGatewayPolicyResource = z.object({attributes: aiGatewayPolicyAttributes, id: z.string(), type: aiGatewayPolicyType});

export const aiGatewayPolicyResponse = z.object({data: aiGatewayPolicyResource});

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
};

/**
 * Get an AI Gateway routing policy
 * 
 * GET /api/v2/policies/{inbound}
 * 
 * Also accepts auth: AuthZ
 */
export const getApiApiV2PoliciesInbound = async (args: GetApiApiV2PoliciesInboundArgs, options?: GetApiApiV2PoliciesInboundOptions) => {
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.user_id != null) query.append("user_id", String(args.user_id))
if (apiKeyAuth !== undefined) headers.set("DD-API-KEY", apiKeyAuth)
if (appKeyAuth !== undefined) headers.set("DD-APPLICATION-KEY", appKeyAuth)

const url = `${baseUrl.replace(/\/+$/, '')}/api/v2/policies/${encodeURIComponent(String(args.inbound))}${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(aiGatewayPolicyResponse, await res.json())
};