import {z} from 'zod'

export type GetApiPotsPotIdCagStatsArgs = {pot_id: string};

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

export const cacheStatsData = z.object({constitution_size: z.number().int().gte(0), certainty_size: z.number().int().gte(0), total_size: z.number().int().gte(0), threshold: z.number().gte(0).lte(1), max_certainty_size: z.number().int().gte(0)});

export const hitStatsData = z.object({total_searches: z.number().int().gte(0), cache_hits: z.number().int().gte(0), cache_misses: z.number().int().gte(0), hit_rate: z.number().gte(0).lte(1)});

export const timingData = z.object({initialized_at: z.string().nullable().optional(), last_refresh: z.string().nullable().optional()});

export const cAGStatsResponse = z.object({pot_id: z.string(), cache_stats: cacheStatsData, hit_stats: hitStatsData, timing: timingData});

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 CAG cache statistics
 * 
 * GET /pots/{pot_id}/cag/stats
 */
export const getApiPotsPotIdCagStats = async (args: GetApiPotsPotIdCagStatsArgs, options: GetApiPotsPotIdCagStatsOptions) => {
const {baseUrl, fetch: fetchFn = fetch} = options ?? {}

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

const url = `${baseUrl.replace(/\/+$/, '')}/pots/${encodeURIComponent(String(args.pot_id))}/cag/stats${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(cAGStatsResponse, await res.json())
};