import React, { useState, useEffect } from 'react';
import { Sidebar } from './components/Sidebar.js';
import { Topbar } from './components/Topbar.js';
import { RebuildModal } from './components/RebuildModal.js';

import { OverviewView } from './views/OverviewView.js';
import { StorageView } from './views/StorageView.js';
import { SharesView } from './views/SharesView.js';
import { AppsView } from './views/AppsView.js';
import { GitOpsView } from './views/GitOpsView.js';
import { LogsView } from './views/LogsView.js';
import { WizardView } from './views/WizardView.js';

import { api } from './api/client.js';
import type {
  SystemStatus,
  ZfsPool,
  ZfsDataset,
  ZfsSnapshot,
  UnimportedPool,
  SmbShare,
  NfsExport,
  AppCatalogItem,
  InstalledApp,
  GitOpsStatus,
  GitCommit,
  LogEntry,
  AppRuntime,
} from './types/index.js';

export const App: React.FC = () => {
  const getInitialTab = () => {
    if (typeof window !== 'undefined') {
      const hash = window.location.hash.replace('#', '');
      if (hash) return hash;
      const params = new URLSearchParams(window.location.search);
      const tab = params.get('tab');
      if (tab) return tab;
    }
    return 'overview';
  };

  const [currentTab, setCurrentTab] = useState(getInitialTab);
  const [showRebuildModal, setShowRebuildModal] = useState(false);

  useEffect(() => {
    const onHashChange = () => {
      const hash = window.location.hash.replace('#', '');
      if (hash) setCurrentTab(hash);
    };
    window.addEventListener('hashchange', onHashChange);
    return () => window.removeEventListener('hashchange', onHashChange);
  }, []);

  const selectTab = (tab: string) => {
    setCurrentTab(tab);
    if (typeof window !== 'undefined') {
      window.location.hash = tab;
    }
  };

  // Application state
  const [status, setStatus] = useState<SystemStatus | null>(null);
  const [pools, setPools] = useState<ZfsPool[]>([]);
  const [datasets, setDatasets] = useState<ZfsDataset[]>([]);
  const [snapshots, setSnapshots] = useState<ZfsSnapshot[]>([]);
  const [unimportedPools, setUnimportedPools] = useState<UnimportedPool[]>([]);
  const [smbShares, setSmbShares] = useState<Record<string, SmbShare>>({});
  const [nfsExports, setNfsExports] = useState<NfsExport[]>([]);
  const [catalog, setCatalog] = useState<AppCatalogItem[]>([]);
  const [installedApps, setInstalledApps] = useState<InstalledApp[]>([]);
  const [gitops, setGitops] = useState<GitOpsStatus | null>(null);
  const [commits, setCommits] = useState<GitCommit[]>([]);
  const [logs, setLogs] = useState<LogEntry[]>([]);
  const [selectedLogUnit, setSelectedLogUnit] = useState('all');

  const loadData = async () => {
    try {
      const [
        statusRes,
        poolsRes,
        datasetsRes,
        snapshotsRes,
        unimportedRes,
        sharesRes,
        exportsRes,
        catalogRes,
        appsRes,
        gitopsRes,
        commitsRes,
        logsRes,
      ] = await Promise.all([
        api.getStatus(),
        api.getPools(),
        api.getDatasets(),
        api.getSnapshots(),
        api.getUnimportedPools(),
        api.getSmbShares(),
        api.getNfsExports(),
        api.getAppCatalog(),
        api.getInstalledApps(),
        api.getGitOpsStatus(),
        api.getGitCommits(),
        api.getLogs(),
      ]);

      if (statusRes) setStatus(statusRes.status);
      if (poolsRes) setPools(poolsRes.pools);
      if (datasetsRes) setDatasets(datasetsRes.datasets);
      if (snapshotsRes) setSnapshots(snapshotsRes.snapshots);
      if (unimportedRes) setUnimportedPools(unimportedRes.pools);
      if (sharesRes) setSmbShares(sharesRes.shares);
      if (exportsRes) setNfsExports(exportsRes.exports);
      if (catalogRes) setCatalog(catalogRes.catalog);
      if (appsRes) setInstalledApps(appsRes.apps);
      if (gitopsRes) setGitops(gitopsRes.status);
      if (commitsRes) setCommits(commitsRes.commits);
      if (logsRes) setLogs(logsRes.logs);
    } catch (err) {
      console.error('Error loading NaxOS state:', err);
    }
  };

  useEffect(() => {
    loadData();
    const interval = setInterval(loadData, 8000);
    return () => clearInterval(interval);
  }, []);

  // Handlers
  const handleImportPool = async (poolName: string) => {
    await api.importPool({ poolName, force: true, noMount: true });
    await loadData();
  };

  const handleScrubPool = async (poolName: string) => {
    await api.scrubPool(poolName, 'start');
    await loadData();
  };

  const handleCreateSnapshot = async (dataset: string, tag: string) => {
    await api.createSnapshot(dataset, tag);
    await loadData();
  };

  const handleRollbackSnapshot = async (snapshotName: string) => {
    await api.rollbackSnapshot(snapshotName);
    await loadData();
  };

  const handleSaveSmbShare = async (share: SmbShare) => {
    await api.saveSmbShare(share);
    await loadData();
  };

  const handleDeleteSmbShare = async (name: string) => {
    await api.deleteSmbShare(name);
    await loadData();
  };

  const handleInstallApp = async (appId: string, runtime: AppRuntime) => {
    await api.installApp({ appId, runtime });
    await loadData();
  };

  const handleSetAppStatus = async (appId: string, appStatus: 'running' | 'stopped') => {
    await api.setAppStatus(appId, appStatus);
    await loadData();
  };

  const handleUninstallApp = async (appId: string) => {
    await api.uninstallApp(appId);
    await loadData();
  };

  const handleRollbackGitOps = async (commitSha: string) => {
    await api.rollbackCommit(commitSha);
    await loadData();
  };

  const handleReboot = async () => {
    if (confirm('Are you sure you want to reboot the NaxOS storage appliance?')) {
      await api.reboot();
      alert('Reboot signal sent. The appliance will restart momentarily.');
    }
  };

  return (
    <div className="flex h-screen w-screen overflow-hidden bg-slate-950 bg-[radial-gradient(ellipse_at_top_right,_var(--tw-gradient-stops))] from-cyan-950/20 via-slate-950 to-slate-950 text-slate-100 font-sans">
      <Sidebar currentTab={currentTab === 'analytics' ? 'overview' : currentTab} onSelectTab={selectTab} />

      <div className="flex-1 flex flex-col min-w-0 overflow-hidden">
        <Topbar
          status={status}
          gitops={gitops}
          onTriggerRebuild={() => setShowRebuildModal(true)}
          onReboot={handleReboot}
        />

        <main className="flex-1 overflow-y-auto p-8">
          {(currentTab === 'overview' || currentTab === 'analytics') && (
            <OverviewView
              status={status}
              pools={pools}
              apps={installedApps}
              onNavigate={selectTab}
            />
          )}

          {currentTab === 'storage' && (
            <StorageView
              pools={pools}
              datasets={datasets}
              snapshots={snapshots}
              unimportedPools={unimportedPools}
              onRefresh={loadData}
              onImportPool={handleImportPool}
              onScrubPool={handleScrubPool}
              onCreateSnapshot={handleCreateSnapshot}
              onRollbackSnapshot={handleRollbackSnapshot}
            />
          )}

          {currentTab === 'shares' && (
            <SharesView
              smbShares={smbShares}
              nfsExports={nfsExports}
              onSaveSmbShare={handleSaveSmbShare}
              onDeleteSmbShare={handleDeleteSmbShare}
            />
          )}

          {currentTab === 'apps' && (
            <AppsView
              catalog={catalog}
              installedApps={installedApps}
              onInstallApp={handleInstallApp}
              onSetStatus={handleSetAppStatus}
              onUninstall={handleUninstallApp}
            />
          )}

          {currentTab === 'gitops' && (
            <GitOpsView
              status={gitops}
              commits={commits}
              onRollback={handleRollbackGitOps}
              onTriggerRebuild={() => setShowRebuildModal(true)}
            />
          )}

          {currentTab === 'logs' && (
            <LogsView
              logs={logs}
              selectedUnit={selectedLogUnit}
              onSelectUnit={setSelectedLogUnit}
            />
          )}

          {currentTab === 'wizard' && <WizardView />}
        </main>
      </div>

      <RebuildModal
        isOpen={showRebuildModal}
        onClose={() => setShowRebuildModal(false)}
        onComplete={loadData}
      />
    </div>
  );
};