import {z} from 'zod'

export type GetApiApiV1DecisionsIdExplainArgs = {id: string, 'X-Tenant-ID': string, 'X-User-Email'?: string | undefined};

export type GetApiApiV1DecisionsIdExplainOptions = {baseUrl?: string | undefined, fetch?: typeof fetch | undefined};

export const decisionExplanation = z.object({decision_id: z.string().optional(), timestamp: z.string().optional(), policy_matches: z.array(z.object({policy_id: z.string().optional(), policy_name: z.string().optional(), action: z.string().optional(), risk_level: z.string().optional(), allow_override: z.boolean().optional(), policy_description: z.string().optional()})).optional(), matched_rules: z.array(z.object({policy_id: z.string().optional(), rule_id: z.string().optional(), rule_text: z.string().optional(), matched_on: z.string().optional()})).optional(), decision: z.string().optional(), reason: z.string().optional(), risk_level: z.string().optional(), override_available: z.boolean().optional(), override_existing_id: z.string().optional(), historical_hit_count_session: z.number().int().optional(), policy_source_link: z.string().optional(), tool_signature: z.string().optional(), policy_version_at_decision: z.number().int().optional(), latest_policy_version: z.number().int().optional(), context: z.record(z.string(), z.string()).optional(), context_truncated: z.boolean().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
};

/**
 * Explain a governance decision
 * 
 * GET /api/v1/decisions/{id}/explain
 */
export const getApiApiV1DecisionsIdExplain = async (args: GetApiApiV1DecisionsIdExplainArgs, options?: GetApiApiV1DecisionsIdExplainOptions) => {
const {baseUrl = "https://orchestrator.getaxonflow.com", fetch: fetchFn = fetch} = options ?? {}

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

if (args['X-Tenant-ID'] != null) headers.set("X-Tenant-ID", String(args['X-Tenant-ID']))
if (args['X-User-Email'] != null) headers.set("X-User-Email", String(args['X-User-Email']))

const url = `${baseUrl.replace(/\/+$/, '')}/api/v1/decisions/${encodeURIComponent(String(args.id))}/explain${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(decisionExplanation, await res.json())
};