import {z} from 'zod'

export type GetApiScop3pApiV1RinComputePdbIdArgs = {pdb_id: string, chain?: string | undefined, cutoff?: number | undefined};

export type GetApiScop3pApiV1RinComputePdbIdOptions = {baseUrl: string, fetch?: typeof fetch | undefined};

export const rINNodeResponse = z.object({id: z.string()});

export const rINEdgeResponse = z.object({source: z.string(), target: z.string(), distance: z.string(), edge_weight: z.string()});

export const rINResponse = z.object({nodes: z.array(rINNodeResponse), edges: z.array(rINEdgeResponse)});

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
};

/**
 * Compute RIN on-the-fly from a PDB file
 * 
 * GET /scop3p/api/v1/rin/compute/{pdb_id}
 */
export const getApiScop3pApiV1RinComputePdbId = async (args: GetApiScop3pApiV1RinComputePdbIdArgs, options: GetApiScop3pApiV1RinComputePdbIdOptions) => {
const {baseUrl, fetch: fetchFn = fetch} = options ?? {}

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

if (args.chain != null) query.append("chain", String(args.chain))
if (args.cutoff != null) query.append("cutoff", String(args.cutoff))

const url = `${baseUrl.replace(/\/+$/, '')}/scop3p/api/v1/rin/compute/${encodeURIComponent(String(args.pdb_id))}${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(rINResponse, await res.json())
};