import {z} from 'zod'

export type Evaluate = {service: string, law: string, parameters?: {[key: string]: unknown} | undefined, effectiveDate?: string | undefined, referenceDate?: string | undefined, input?: {[key: string]: unknown} | undefined, output?: string | undefined, approved?: boolean | undefined};

export type CreateApiEvaluateArgs = {body: {data: Evaluate}};

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

export const pathNode: z.ZodType<PathNode> = z.object({type: z.string(), name: z.string(), result: z.unknown(), resolveType: z.string().optional(), required: z.boolean().optional(), details: z.record(z.string(), z.unknown()).optional(), children: z.array(z.lazy(() => pathNode)).optional()});

export const responseEvaluateSchema = z.object({output: z.record(z.string(), z.unknown()), input: z.record(z.string(), z.unknown()), requirementsMet: z.boolean(), rulespecId: z.string(), missingRequired: z.boolean(), path: pathNode});

export const createApiEvaluateResponse = z.object({data: responseEvaluateSchema});

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
};

/**
 * Evaluate the law
 * 
 * POST /evaluate
 */
export const createApiEvaluate = async (args: CreateApiEvaluateArgs, options?: CreateApiEvaluateOptions) => {
const {baseUrl = "https://rvig-engine.bzlg.apps.digilab.network/v0", fetch: fetchFn = fetch} = options ?? {}

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

const url = `${baseUrl.replace(/\/+$/, '')}/evaluate${query.size > 0 ? `?${query}` : ''}`

const res = await fetchFn(url, {method: "POST", headers, body: JSON.stringify(args.body)})

if (!res.ok) throw new Error(`Request failed with status ${res.status}`, {cause: {status: res.status, body: await res.text()}})

return validateResponse(createApiEvaluateResponse, await res.json())
};