import {z} from 'zod'

export type CreateApiPoliciesSimulateArgs = {'X-Steward-Request-Timestamp'?: string | undefined, 'X-Steward-Request-Expires-At'?: string | undefined, 'X-Steward-Signature'?: string | undefined, 'X-Steward-Signing-Key-Id'?: string | undefined, 'Idempotency-Key'?: string | undefined, body: {policyId?: string | undefined, agentId?: string | undefined, rules?: Array<{[key: string]: unknown}> | undefined, request?: ({kind?: 'transaction' | undefined, to: string, value: string, data?: string | undefined, chainId?: number | undefined} | {kind?: 'proxy' | undefined, method: 'GET' | 'POST' | 'PUT' | 'PATCH' | 'DELETE', url: string, body: unknown, data: unknown, value?: string | undefined, chainId?: number | undefined}) | undefined, kind?: ('transaction' | 'proxy') | undefined, to?: string | undefined, value?: string | undefined, data: unknown, chainId?: number | undefined, method?: ('GET' | 'POST' | 'PUT' | 'PATCH' | 'DELETE') | undefined, url?: string | undefined, body: unknown}};

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

export const createApiPoliciesSimulateResponse = z.object({ok: z.literal(true), data: z.object({approved: z.boolean(), requiresManualApproval: z.boolean(), results: z.array(z.record(z.string(), z.unknown())), counters: z.record(z.string(), z.unknown())})});

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
};

/**
 * Simulate policy evaluation
 * 
 * POST /policies/simulate
 * 
 * Also accepts auth: tenantApiKey
 */
export const createApiPoliciesSimulate = async (args: CreateApiPoliciesSimulateArgs, options?: CreateApiPoliciesSimulateOptions) => {
const {baseUrl = "http://localhost:3200", 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['X-Steward-Request-Timestamp'] != null) headers.set("X-Steward-Request-Timestamp", String(args['X-Steward-Request-Timestamp']))
if (args['X-Steward-Request-Expires-At'] != null) headers.set("X-Steward-Request-Expires-At", String(args['X-Steward-Request-Expires-At']))
if (args['X-Steward-Signature'] != null) headers.set("X-Steward-Signature", String(args['X-Steward-Signature']))
if (args['X-Steward-Signing-Key-Id'] != null) headers.set("X-Steward-Signing-Key-Id", String(args['X-Steward-Signing-Key-Id']))
if (args['Idempotency-Key'] != null) headers.set("Idempotency-Key", String(args['Idempotency-Key']))
if (bearerAuth !== undefined) headers.set('authorization', `Bearer ${bearerAuth}`)

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