import {z} from 'zod'

export type Input = boolean | string | number | Array<unknown> | {[key: string]: unknown};

export type CreateApiV1DataPathArgs = {path: unknown, 'Content-Encoding'?: 'gzip' | undefined, 'Accept-Encoding'?: 'gzip' | undefined, pretty?: boolean | undefined, provenance?: boolean | undefined, explain?: ('notes' | 'fails' | 'full' | 'debug') | undefined, metrics?: boolean | undefined, instrument?: boolean | undefined, 'strict-builtin-errors'?: boolean | undefined, body: {input: Input}};

export type CreateApiV1DataPathOptions = {baseUrl?: string | undefined, bearerAuth?: string | undefined, fetch?: typeof fetch | undefined};

export const result = z.union([z.boolean(), z.string(), z.number(), z.array(z.unknown()), z.record(z.string(), z.unknown())]);

export const provenance = z.object({version: z.string().optional(), build_commit: z.string().optional(), build_timestamp: z.string().optional(), build_host: z.string().optional(), bundles: z.record(z.string(), z.object({revision: z.string()})).optional()});

export const successfulPolicyResponse = z.object({result: result.optional(), metrics: z.record(z.string(), z.unknown()).optional(), decision_id: z.string().optional(), provenance: provenance.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
};

/**
 * Execute a policy given an input
 * 
 * POST /v1/data/{path}
 */
export const createApiV1DataPath = async (args: CreateApiV1DataPathArgs, options?: CreateApiV1DataPathOptions) => {
const {baseUrl = "http://localhost:8181", fetch: fetchFn = fetch, bearerAuth} = options ?? {}

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

if (args['Content-Encoding'] != null) headers.set("Content-Encoding", String(args['Content-Encoding']))
if (args['Accept-Encoding'] != null) headers.set("Accept-Encoding", String(args['Accept-Encoding']))
if (args.pretty != null) query.append("pretty", String(args.pretty))
if (args.provenance != null) query.append("provenance", String(args.provenance))
if (args.explain != null) query.append("explain", String(args.explain))
if (args.metrics != null) query.append("metrics", String(args.metrics))
if (args.instrument != null) query.append("instrument", String(args.instrument))
if (args['strict-builtin-errors'] != null) query.append("strict-builtin-errors", String(args['strict-builtin-errors']))
if (bearerAuth !== undefined) headers.set('authorization', `Bearer ${bearerAuth}`)

const url = `${baseUrl.replace(/\/+$/, '')}/v1/data/${encodeURIComponent(String(args.path))}${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(successfulPolicyResponse, await res.json())
};