import { listUserDevices, registerDevice } from "../../db/devices";
import { getProfile } from "../../db/profile";
import { getPlanLimits } from "../../utils/plan-features";

/**
 * POST /api/devices/register
 *
 * Body: { deviceId: string, platform: string, model?: string, name?: string }
 *
 * Idempotent: gleiche deviceId für gleichen User → updated lastSeenAt + 200.
 * Wenn neues Device + Limit erreicht → 403 mit { error, devices } damit der
 * Frontend-Drawer dem User die Wahl gibt, welches Gerät er freigibt.
 */
export default defineEventHandler(async (event) => {
  // Bootstrap: kein Device-Check sonst wäre erstes Register unmöglich (chicken-egg)
  const user = await requireUser(event, { skipDeviceCheck: true });
  const body = await readBody(event);
  const { deviceId, platform, model, name, osVersion } = body as {
    deviceId?: string;
    platform?: string;
    model?: string;
    name?: string;
    osVersion?: string;
  };

  if (!deviceId || !platform) {
    throw createError({
      statusCode: 400,
      message: "deviceId und platform required",
    });
  }
  if (!["ios", "android", "web"].includes(platform)) {
    throw createError({ statusCode: 400, message: "invalid platform" });
  }

  const profile = await getProfile(user.id);
  const limits = getPlanLimits(profile?.plan ?? "free");

  try {
    const { device, created, merged } = await registerDevice({
      userId: user.id,
      deviceId,
      platform,
      model: model ?? null,
      name: name ?? null,
      osVersion: osVersion ?? null,
      maxDevices: limits.maxAppDevices,
    });
    return { device, created, merged: merged ?? false, max: limits.maxAppDevices };
  } catch (err: any) {
    if (err.code === "DEVICE_LIMIT_REACHED") {
      const allDevices = await listUserDevices(user.id);
      const devices = allDevices.map((d) => ({
        ...d,
        isCurrent: d.deviceId === deviceId,
      }));
      throw createError({
        statusCode: 403,
        statusMessage: "device_limit_reached",
        data: {
          error: "device_limit_reached",
          max: limits.maxAppDevices,
          plan: profile?.plan ?? "free",
          devices,
        },
      });
    }
    throw err;
  }
});