import {z} from 'zod'

export type GetApiApiV2ProviderModelsArgs = {integration_type: string, integration_account_id: string, project_id?: string | undefined, location?: string | undefined, bedrock_region?: string | undefined, foundry_resource_id?: string | undefined};

export type GetApiApiV2ProviderModelsOptions = {baseUrl?: string | undefined, apiKeyAuth?: string | undefined, appKeyAuth?: string | undefined, fetch?: typeof fetch | undefined};

export const aiGatewaySupportedOperation = z.enum(["ANTHROPIC_MESSAGES", "ANTHROPIC_COUNT_TOKENS", "OPENAI_CHAT_COMPLETIONS", "OPENAI_RESPONSES", "OPENAI_WEB_SEARCH", "OPENAI_EMBEDDINGS", "GEMINI_GENERATE_CONTENT", "GEMINI_RAW_PREDICTIONS"]);

export const aiGatewayDiscoveredModelAttributes = z.object({display_name: z.string().optional(), model_id_wire: z.string(), supported_operations: z.array(aiGatewaySupportedOperation)});

export const aiGatewayDiscoveredModelType = z.literal("provider-models");

export const aiGatewayDiscoveredModelResource = z.object({attributes: aiGatewayDiscoveredModelAttributes, id: z.string(), type: aiGatewayDiscoveredModelType});

export const aiGatewayDiscoveredModelListResponse = z.object({data: z.array(aiGatewayDiscoveredModelResource)});

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 models available from a provider integration
 * 
 * GET /api/v2/provider-models
 * 
 * Also accepts auth: AuthZ
 */
export const getApiApiV2ProviderModels = async (args: GetApiApiV2ProviderModelsArgs, options?: GetApiApiV2ProviderModelsOptions) => {
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.integration_type != null) query.append("integration_type", String(args.integration_type))
if (args.integration_account_id != null) query.append("integration_account_id", String(args.integration_account_id))
if (args.project_id != null) query.append("project_id", String(args.project_id))
if (args.location != null) query.append("location", String(args.location))
if (args.bedrock_region != null) query.append("bedrock_region", String(args.bedrock_region))
if (args.foundry_resource_id != null) query.append("foundry_resource_id", String(args.foundry_resource_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/provider-models${query.size > 0 ? `?${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(aiGatewayDiscoveredModelListResponse, await res.json())
};