import { AXIS_COMMANDS, axisGate } from "./axis-contract.mjs";

export const COMMAND_ACTIONS = Object.freeze(Object.fromEntries(Object.entries(AXIS_COMMANDS).map(([action, command]) => [command, action])));

export class AxisGateError extends Error {
  constructor(result) {
    super(result.reason);
    this.name = "AxisGateError";
    this.code = result.reason;
    this.gate = result;
  }
}

export class AxisOperationController {
  constructor(client) {
    if (!client || typeof client.send !== "function") throw new Error("axis_operation_client_required");
    this.client = client;
    this.counter = 0;
    this.trace = [];
  }

  nextOperationId(kind) {
    this.counter += 1;
    return `axis-${String(kind).toLowerCase().replace(/[^a-z0-9]+/g, "-")}-${String(this.counter).padStart(6, "0")}`;
  }

  async execute(kind, payload = {}, { state = {}, action = COMMAND_ACTIONS[kind] ?? null, gate = true } = {}) {
    const operationId = this.nextOperationId(kind);
    const gateResult = action ? axisGate(action, state) : { action: null, enabled: true, reason: "axis_unrestricted_internal_command" };
    if (gate && !gateResult.enabled) {
      this.trace.push(Object.freeze({ operation_id: operationId, kind, action, phase: "blocked", reason: gateResult.reason }));
      throw new AxisGateError(gateResult);
    }
    this.trace.push(Object.freeze({ operation_id: operationId, kind, action, phase: "pending", reason: gateResult.reason }));
    try {
      const response = await this.client.send(kind, payload, operationId);
      this.trace.push(Object.freeze({ operation_id: operationId, kind, action, phase: "result", response_kind: response?.kind ?? null }));
      return Object.freeze({ operationId, response, gate: gateResult });
    } catch (error) {
      this.trace.push(Object.freeze({ operation_id: operationId, kind, action, phase: "error", reason: error?.message ?? String(error) }));
      throw error;
    }
  }

  exportTrace() { return structuredClone(this.trace); }
}