import {
  approveDevicePairing,
  listDevicePairing,
  rejectDevicePairing,
} from "../../infra/device-pairing.js";
import {
  ErrorCodes,
  errorShape,
  formatValidationErrors,
  validateDevicePairApproveParams,
  validateDevicePairListParams,
  validateDevicePairRejectParams,
} from "../protocol/index.js";
import type { GatewayRequestHandlers } from "./types.js";

export const deviceHandlers: GatewayRequestHandlers = {
  "device.pair.list": async ({ params, respond }) => {
    if (!validateDevicePairListParams(params)) {
      respond(
        false,
        undefined,
        errorShape(
          ErrorCodes.INVALID_REQUEST,
          `invalid device.pair.list params: ${formatValidationErrors(
            validateDevicePairListParams.errors,
          )}`,
        ),
      );
      return;
    }
    const list = await listDevicePairing();
    respond(true, list, undefined);
  },
  "device.pair.approve": async ({ params, respond, context }) => {
    if (!validateDevicePairApproveParams(params)) {
      respond(
        false,
        undefined,
        errorShape(
          ErrorCodes.INVALID_REQUEST,
          `invalid device.pair.approve params: ${formatValidationErrors(
            validateDevicePairApproveParams.errors,
          )}`,
        ),
      );
      return;
    }
    const { requestId } = params as { requestId: string };
    const approved = await approveDevicePairing(requestId);
    if (!approved) {
      respond(false, undefined, errorShape(ErrorCodes.INVALID_REQUEST, "unknown requestId"));
      return;
    }
    context.broadcast(
      "device.pair.resolved",
      {
        requestId,
        deviceId: approved.device.deviceId,
        decision: "approved",
        ts: Date.now(),
      },
      { dropIfSlow: true },
    );
    respond(true, approved, undefined);
  },
  "device.pair.reject": async ({ params, respond, context }) => {
    if (!validateDevicePairRejectParams(params)) {
      respond(
        false,
        undefined,
        errorShape(
          ErrorCodes.INVALID_REQUEST,
          `invalid device.pair.reject params: ${formatValidationErrors(
            validateDevicePairRejectParams.errors,
          )}`,
        ),
      );
      return;
    }
    const { requestId } = params as { requestId: string };
    const rejected = await rejectDevicePairing(requestId);
    if (!rejected) {
      respond(false, undefined, errorShape(ErrorCodes.INVALID_REQUEST, "unknown requestId"));
      return;
    }
    context.broadcast(
      "device.pair.resolved",
      {
        requestId,
        deviceId: rejected.deviceId,
        decision: "rejected",
        ts: Date.now(),
      },
      { dropIfSlow: true },
    );
    respond(true, rejected, undefined);
  },
};