import {z} from 'zod'

export type GetApiV1ModelRouterModelsOptions = {baseUrl: string, APIKeyHeader?: string | undefined, fetch?: typeof fetch | undefined};

export const availableModel = z.object({model_identifier: z.string(), provider: z.string(), supports_streaming: z.boolean(), supports_tools: z.boolean().optional(), supports_vision: z.boolean().optional(), max_context_window: z.number().int(), regions: z.array(z.string()).optional(), family: z.string().optional(), supports_json_schema: z.boolean().optional(), supports_reasoning_effort: z.boolean().optional(), allowed_efforts: z.array(z.string()).optional(), fastest_effort: z.string().nullable().optional(), supports_temperature: z.boolean().optional(), supports_thinking: z.boolean().optional(), supports_thinking_budget: z.boolean().optional(), supports_audio: z.boolean().optional(), compliance_tags: z.array(z.string()).optional(), input_price_per_1m: z.number(), output_price_per_1m: z.number()});

export const getApiV1ModelRouterModelsResponse = z.array(availableModel);

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 available models with pricing and capabilities
 * 
 * GET /v1/model-router/models
 */
export const getApiV1ModelRouterModels = async (options: GetApiV1ModelRouterModelsOptions) => {
const {baseUrl, fetch: fetchFn = fetch, APIKeyHeader} = options ?? {}

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

if (APIKeyHeader !== undefined) headers.set("x-api-key", APIKeyHeader)

const url = `${baseUrl.replace(/\/+$/, '')}/v1/model-router/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(getApiV1ModelRouterModelsResponse, await res.json())
};