const DEFAULT_DATA = {
  overview: {
    generated_at: new Date().toISOString(),
    overall_status: "online",
    refresh_hint_seconds: 20,
    services: { online: 8, degraded: 2, offline: 1, total: 11 },
    docker: { running: 18, stopped: 2, unhealthy: 1, total: 20, source_status: "online" },
    system: {
      cpu_percent: 23,
      ram_percent: 61,
      root_storage_percent: 49,
      network_rx_mbps: 12.4,
      network_tx_mbps: 3.1,
      uptime_seconds: 864000,
    },
    home_assistant: {
      status: "online",
      label: "Home Assistant",
      version: "2026.3.4",
      response_time_ms: 142,
      last_checked: new Date().toISOString(),
    },
  },
  system: {
    generated_at: new Date().toISOString(),
    source: { name: "system", status: "online", host_name: "nas", agent_name: "not_configured" },
    cpu: { usage_percent: 23, cores: 8, load_1: 0.8, load_5: 0.6, load_15: 0.5 },
    memory: { used_gb: 12.4, total_gb: 32.0, available_gb: 19.6, usage_percent: 38.7 },
    network: { primary_interface: "eth0", rx_mbps: 12.4, tx_mbps: 3.1 },
    host: { uptime_seconds: 864000, platform: "linux", kernel: "6.1.0" },
  },
  storage: {
    generated_at: new Date().toISOString(),
    summary: { total_used_gb: 2048, total_size_gb: 8192, total_free_gb: 6144, overall_usage_percent: 25 },
    disks: [],
  },
  services: {
    generated_at: new Date().toISOString(),
    summary: { overall_status: "online", total: 11, online: 8, degraded: 2, offline: 1 },
    docker: { running: 18, stopped: 2, unhealthy: 1, total: 20, source_status: "online" },
    uptime_kuma: { monitors_up: 8, monitors_down: 1, source_status: "online" },
    items: [],
  },
  adguard: { source_name: "adguard", source_status: "offline", total_queries: 0, blocked_queries: 0, blocked_percent: 0, avg_processing_ms: 0 },
  scrutiny: { source_name: "scrutiny", source_status: "offline", overall_status: "offline", devices: [], failed_count: 0, total_count: 0 },
  immich: { source_name: "immich", source_status: "offline", photos: 0, videos: 0, storage_gb: 0 },
  backrest: { source_name: "backrest", source_status: "offline", repo_count: 0, last_backup_age_hours: null, last_backup_status: "unknown", error_count: 0 },
  home_assistant: { source_name: "home_assistant", status: "offline", version: null, lights_on: 0, lights_total: 0, climate_active: 0, doors_open: 0, alerts: 0 },
  uptime_kuma: { source_name: "uptime_kuma", source_status: "offline", monitors_up: 0, monitors_down: 0, monitors_paused: 0, total: 0, monitors: [] },
};

let _state = structuredClone(DEFAULT_DATA);
const _subscribers = [];

export function getState() { return _state; }
export function subscribe(fn) { _subscribers.push(fn); }
export function updateData(partial) {
  _state = { ..._state, ...partial };
  _subscribers.forEach((fn) => fn(_state));
}