import {z} from 'zod'

export type GetApiPreprocessingVepCacheSearchArgs = {chromosome?: string | undefined, position?: number | undefined, ref?: string | undefined, alt?: string | undefined, gene?: string | undefined, limit?: number | undefined};

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

export const vepCacheConsequenceBreakdown = z.object({consequence: z.string(), impact: z.string(), count: z.number().int()});

export const vepCacheSearchResult = z.object({mode: z.string(), query_time_ms: z.number().int().optional(), status: z.string().nullable().optional(), positive_hits: z.array(z.record(z.string(), z.unknown())).optional(), negative_hits: z.array(z.record(z.string(), z.unknown())).optional(), gene: z.string().nullable().optional(), total_variants: z.number().int().optional(), consequence_breakdown: z.array(vepCacheConsequenceBreakdown).optional(), sample_variants: z.array(z.record(z.string(), z.unknown())).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
};

/**
 * Search Vep Cache
 * 
 * GET /preprocessing/vep-cache/search
 */
export const getApiPreprocessingVepCacheSearch = async (args: GetApiPreprocessingVepCacheSearchArgs, options: GetApiPreprocessingVepCacheSearchOptions) => {
const {baseUrl, fetch: fetchFn = fetch} = options ?? {}

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

if (args.chromosome != null) query.append("chromosome", String(args.chromosome))
if (args.position != null) query.append("position", String(args.position))
if (args.ref != null) query.append("ref", String(args.ref))
if (args.alt != null) query.append("alt", String(args.alt))
if (args.gene != null) query.append("gene", String(args.gene))
if (args.limit != null) query.append("limit", String(args.limit))

const url = `${baseUrl.replace(/\/+$/, '')}/preprocessing/vep-cache/search${query.size > 0 ? `?${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(vepCacheSearchResult, await res.json())
};