import {z} from 'zod'

export type GetApiV1AnalyticsModelRouterCostBySessionArgs = {session_id?: (string | null) | undefined, agent_id?: (string | null) | undefined, limit?: number | undefined, start_date: string, end_date: string};

export type GetApiV1AnalyticsModelRouterCostBySessionOptions = {baseUrl: string, APIKeyHeader?: string | undefined, fetch?: typeof fetch | undefined};

export const costBySessionRow = z.object({session_id: z.string(), agent_id: z.string(), total_cost_usd: z.number(), input_cost_usd: z.number(), output_cost_usd: z.number(), cache_cost_usd: z.number(), total_tokens: z.number().int(), invocations: z.number().int(), success_rate: z.number(), first_seen: z.string(), last_seen: z.string()});

export const getApiV1AnalyticsModelRouterCostBySessionResponse = z.array(costBySessionRow);

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
};

/**
 * Top-N sessions (conversations) by spend
 * 
 * GET /v1/analytics/model-router/cost/by-session
 */
export const getApiV1AnalyticsModelRouterCostBySession = async (args: GetApiV1AnalyticsModelRouterCostBySessionArgs, options: GetApiV1AnalyticsModelRouterCostBySessionOptions) => {
const {baseUrl, fetch: fetchFn = fetch, APIKeyHeader} = options ?? {}

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

if (args.session_id != null) query.append("session_id", String(args.session_id))
if (args.agent_id != null) query.append("agent_id", String(args.agent_id))
if (args.limit != null) query.append("limit", String(args.limit))
if (args.start_date != null) query.append("start_date", String(args.start_date))
if (args.end_date != null) query.append("end_date", String(args.end_date))
if (APIKeyHeader !== undefined) headers.set("x-api-key", APIKeyHeader)

const url = `${baseUrl.replace(/\/+$/, '')}/v1/analytics/model-router/cost/by-session${query.size > 0 ? `?${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(getApiV1AnalyticsModelRouterCostBySessionResponse, await res.json())
};