import {z} from 'zod'

export type CreateApiUsageTotalArgs = {'X-Project-Id': string, body: {start_time_us?: number | undefined, end_time_us?: number | undefined}};

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

export const totalUsageResponse = z.object({models: z.array(z.object({provider: z.string().optional(), model_name: z.string().optional(), total_input_tokens: z.number().int().optional(), total_output_tokens: z.number().int().optional(), total_cost: z.number().optional(), cost_per_input_token: z.number().optional(), cost_per_output_token: z.number().optional()})), total: z.object({total_input_tokens: z.number().int().optional(), total_output_tokens: z.number().int().optional(), total_cost: z.number().optional()}), period_start: z.number().int(), period_end: 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
};

/**
 * Get total usage
 * 
 * POST /usage/total
 */
export const createApiUsageTotal = async (args: CreateApiUsageTotalArgs, options?: CreateApiUsageTotalOptions) => {
const {baseUrl = "https://api.us-east-1.langdb.ai", fetch: fetchFn = fetch, BearerAuth} = options ?? {}

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

if (args['X-Project-Id'] != null) headers.set("X-Project-Id", String(args['X-Project-Id']))
if (BearerAuth !== undefined) headers.set('authorization', `Bearer ${BearerAuth}`)

const url = `${baseUrl.replace(/\/+$/, '')}/usage/total${query.size > 0 ? `?${query}` : ''}`

const res = await fetchFn(url, {method: "POST", headers, body: JSON.stringify(args.body)})

if (!res.ok) throw new Error(`Request failed with status ${res.status}`, {cause: {status: res.status, body: await res.text()}})

return validateResponse(totalUsageResponse, await res.json())
};