import {z} from 'zod'

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

export const vepCacheDistributionEntry = z.object({label: z.string(), count: z.number().int(), pct: z.number().optional()});

export const vepCacheChromosomeEntry = z.object({chromosome: z.string(), positive: z.number().int(), negative: z.number().int()});

export const vepCacheStatsResponse = z.object({file_exists: z.boolean(), file_size_bytes: z.number().int().optional(), file_size_human: z.string().optional(), vep_version: z.string().nullable().optional(), positive_count: z.number().int().optional(), negative_count: z.number().int().optional(), total_count: z.number().int().optional(), oldest_entry: z.string().nullable().optional(), newest_entry: z.string().nullable().optional(), dedup_cutoff: z.string().nullable().optional(), impact_distribution: z.array(vepCacheDistributionEntry).optional(), consequence_distribution: z.array(vepCacheDistributionEntry).optional(), biotype_distribution: z.array(vepCacheDistributionEntry).optional(), chromosome_distribution: z.array(vepCacheChromosomeEntry).optional(), sample_positive: z.array(z.record(z.string(), z.unknown())).optional(), sample_negative: z.array(z.record(z.string(), z.unknown())).optional(), query_time_ms: z.number().int().optional()});

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 Vep Cache Stats
 * 
 * GET /preprocessing/vep-cache/stats
 */
export const getApiPreprocessingVepCacheStats = async (options: GetApiPreprocessingVepCacheStatsOptions) => {
const {baseUrl, fetch: fetchFn = fetch} = options ?? {}

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

const url = `${baseUrl.replace(/\/+$/, '')}/preprocessing/vep-cache/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(vepCacheStatsResponse, await res.json())
};