import {z} from 'zod'

export type GetApiGenesArgs = {alias?: string | undefined, direction?: ('ASC' | 'DESC') | undefined, keyword?: string | undefined, pageNumber?: number | undefined, pageSize?: number | undefined, projection?: ('DETAILED' | 'ID' | 'META' | 'SUMMARY') | undefined, sortBy?: ('cytoband' | 'entrezGeneId' | 'hugoGeneSymbol' | 'length' | 'type') | undefined};

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

export const gene = z.object({entrezGeneId: z.number().int(), geneticEntityId: z.number().int(), hugoGeneSymbol: z.string(), type: z.string().optional()});

export const getApiGenesResponse = z.array(gene);

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 all genes
 * 
 * GET /genes
 */
export const getApiGenes = async (args: GetApiGenesArgs, options: GetApiGenesOptions) => {
const {baseUrl, fetch: fetchFn = fetch} = options ?? {}

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

if (args.alias != null) query.append("alias", String(args.alias))
if (args.direction != null) query.append("direction", String(args.direction))
if (args.keyword != null) query.append("keyword", String(args.keyword))
if (args.pageNumber != null) query.append("pageNumber", String(args.pageNumber))
if (args.pageSize != null) query.append("pageSize", String(args.pageSize))
if (args.projection != null) query.append("projection", String(args.projection))
if (args.sortBy != null) query.append("sortBy", String(args.sortBy))

const url = `${baseUrl.replace(/\/+$/, '')}/genes${query.size > 0 ? `?${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(getApiGenesResponse, await res.json())
};