import {z} from 'zod'

export type GetApiApiProvidersOptions = {baseUrl?: string | undefined, fetch?: typeof fetch | undefined};

export const modelProvider = z.enum(["openai", "anthropic", "azure", "bedrock", "cohere", "vertex", "mistral", "ollama", "groq", "sgl"]);

export const key = z.object({value: z.string(), weight: z.number().optional(), models: z.array(z.string()).optional(), azure_key_config: z.object({endpoint: z.string().optional(), deployments: z.object({}).optional(), api_version: z.string().optional()}).optional(), vertex_key_config: z.object({project_id: z.string().optional(), region: z.string().optional(), auth_credentials: z.string().optional()}).optional(), bedrock_key_config: z.object({access_key: z.string().optional(), secret_key: z.string().optional(), session_token: z.string().optional(), region: z.string().optional(), arn: z.string().optional(), deployments: z.object({}).optional()}).optional()});

export const networkConfig = z.object({timeout: z.number().int().optional(), max_retries: z.number().int().optional()});

export const concurrencyAndBufferSize = z.object({concurrency: z.number().int().optional(), buffer_size: z.number().int().optional()});

export const proxyConfig = z.object({url: z.string().optional(), username: z.string().optional(), password: z.string().optional()});

export const providerResponse = z.object({name: modelProvider, keys: z.array(key), network_config: networkConfig, concurrency_and_buffer_size: concurrencyAndBufferSize, proxy_config: proxyConfig.optional()});

export const listProvidersResponse = z.object({providers: z.array(providerResponse), total: z.number().int()});

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 Providers
 * 
 * GET /api/providers
 */
export const getApiApiProviders = async (options?: GetApiApiProvidersOptions) => {
const {baseUrl = "http://localhost:8080", fetch: fetchFn = fetch} = options ?? {}

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

const url = `${baseUrl.replace(/\/+$/, '')}/api/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(listProvidersResponse, await res.json())
};