import {z} from 'zod'

export type GetApiApiV2ProvidersOptions = {baseUrl?: string | undefined, apiKeyAuth?: string | undefined, appKeyAuth?: string | undefined, fetch?: typeof fetch | undefined};

export const aiGatewayCustomProviderSupportedOperation = z.enum(["OPENAI_CHAT_COMPLETIONS", "OPENAI_RESPONSES", "ANTHROPIC_MESSAGES"]);

export const aiGatewayProviderIntegrationConfig = z.object({bedrock_region: z.string().max(64).optional(), foundry_project: z.string().max(256).optional(), foundry_resource_id: z.string().max(512).optional(), location: z.string().max(256).optional(), project_id: z.string().max(256).optional(), supported_operations: z.array(aiGatewayCustomProviderSupportedOperation).optional()});

export const aiGatewayKnownProvider = z.enum(["custom", "anthropic", "openai", "azure_openai", "bedrock", "gemini", "baseten", "fireworks", "together", "typesafe", "azure_foundry"]);

export const aiGatewayProviderAttributes = z.object({cost_multiplier: z.number(), created_at: z.string(), integration_account_id: z.string(), integration_config: aiGatewayProviderIntegrationConfig.optional(), known_provider: aiGatewayKnownProvider, name: z.string(), slug: z.string(), updated_at: z.string()});

export const aiGatewayModelCatalogEntryType = z.literal("model-catalog-entries");

export const aiGatewayModelCatalogEntryIdentifier = z.object({id: z.string(), type: aiGatewayModelCatalogEntryType});

export const aiGatewayProviderModelsRelationshipData = z.array(aiGatewayModelCatalogEntryIdentifier);

export const aiGatewayProviderModelsRelationship = z.object({data: aiGatewayProviderModelsRelationshipData});

export const aiGatewayProviderRelationships = z.object({models: aiGatewayProviderModelsRelationship});

export const aiGatewayProviderType = z.literal("providers");

export const aiGatewayProviderResource = z.object({attributes: aiGatewayProviderAttributes, id: z.string(), relationships: aiGatewayProviderRelationships.optional(), type: aiGatewayProviderType});

export const aiGatewayProviderListResponse = z.object({data: z.array(aiGatewayProviderResource)});

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 providers
 * 
 * GET /api/v2/providers
 * 
 * Also accepts auth: AuthZ
 */
export const getApiApiV2Providers = async (options?: GetApiApiV2ProvidersOptions) => {
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/providers${query.size > 0 ? `?${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(aiGatewayProviderListResponse, await res.json())
};