

import React, { useEffect, useState, useCallback, useRef } from 'react';
import { Playlist, ServerType, SyncStrategy, PlexServerConnection, PathMappingConfig, PathMappingMode, SyncState, ScheduleSettings, ScheduleMode, BackupSettings } from './types';
import { apiService } from './services/api';
import { 
  STRIPE_BASE_SPEED,
  STRIPE_DECEL_DURATION_MS,
  STRIPE_TILE_SIZE,
  STRIPE_BACKGROUND_SIZE,
  SYNC_SUCCESS_TOTAL_MS,
  SYNC_ERROR_RESET_MS,
  TOAST_AUTO_DISMISS_MS,
  TOAST_EXIT_DURATION_MS
} from './Config';
import { SYNC_BANNER_PADDING_X, SYNC_BANNER_PADDING_Y, SYNC_BANNER_MIN_WIDTH } from './Config';
import ServerPanel from './components/ServerPanel';
import StrategySelector from './components/StrategySelector';
import ConnectionModal from './components/ConnectionModal';
import { ArrowLeftRight, ShieldCheck, X, Server, ServerOff, Clock, Eye, EyeOff, Type, Code2 } from 'lucide-react';

interface Toast {
  id: number;
  message: string;
  exiting: boolean;
  entering: boolean;
}

// Custom hook to handle the stripe animation logic
const useStripeAnimation = (syncState: SyncState) => {
  const leftYellowRef = useRef<HTMLDivElement>(null);
  const leftGreenRef = useRef<HTMLDivElement>(null);
  const rightYellowRef = useRef<HTMLDivElement>(null);
  const rightGreenRef = useRef<HTMLDivElement>(null);

  const requestRef = useRef<number | undefined>(undefined);
  const lastTimeRef = useRef<number>(0);
  const offsetRef = useRef<number>(0);
  
  // State tracking for deceleration
  const isDeceleratingRef = useRef(false);
  const decelStartTimeRef = useRef(0);

  const animate = (time: number) => {
    if (lastTimeRef.current === 0) lastTimeRef.current = time;
    const dt = (time - lastTimeRef.current) / 1000;
    lastTimeRef.current = time;

    let speed = STRIPE_BASE_SPEED; // pixels per second

    if (isDeceleratingRef.current) {
        const t = time - decelStartTimeRef.current;
        const duration = STRIPE_DECEL_DURATION_MS; // deceleration duration
        if (t >= duration) {
            speed = 0;
        } else {
            // Linear slow down
            speed = speed * (1 - (t / duration));
        }
    }

    // Update offset
    offsetRef.current += speed * dt;
    const modOffset = offsetRef.current % STRIPE_TILE_SIZE;

    // Apply to DOM elements directly for performance
    const leftPos = `right ${modOffset}px top 0`;
    const rightPos = `left ${modOffset}px top 0`;

    if (leftYellowRef.current) leftYellowRef.current.style.backgroundPosition = leftPos;
    if (leftGreenRef.current) leftGreenRef.current.style.backgroundPosition = leftPos;
    if (rightYellowRef.current) rightYellowRef.current.style.backgroundPosition = rightPos;
    if (rightGreenRef.current) rightGreenRef.current.style.backgroundPosition = rightPos;

    // Continue loop if moving or if we are in the middle of decelerating
    if (speed > 0 || (isDeceleratingRef.current && (time - decelStartTimeRef.current) < STRIPE_DECEL_DURATION_MS)) {
        requestRef.current = requestAnimationFrame(animate);
    }
  };

  useEffect(() => {
    if (syncState === SyncState.SYNCING) {
        isDeceleratingRef.current = false;
        lastTimeRef.current = 0;
        // Start animation loop
        if (!requestRef.current) {
             requestRef.current = requestAnimationFrame(animate);
        }
    } else if (syncState === SyncState.SUCCESS) {
        isDeceleratingRef.current = true;
        decelStartTimeRef.current = performance.now();
        // Ensure loop is running to handle deceleration phase
        if (!requestRef.current) {
            requestRef.current = requestAnimationFrame(animate);
        }
    } else {
        // IDLE or ERROR: Stop animation
        if (requestRef.current) {
            cancelAnimationFrame(requestRef.current);
            requestRef.current = undefined;
        }
        offsetRef.current = 0; 
    }
    
    return () => {
        if (requestRef.current) {
            cancelAnimationFrame(requestRef.current);
            requestRef.current = undefined;
        }
    };
  }, [syncState]);

  return { leftYellowRef, leftGreenRef, rightYellowRef, rightGreenRef };
};

const App: React.FC = () => {
  const [localPlaylists, setLocalPlaylists] = useState<Playlist[]>([]);
  const [cloudPlaylists, setCloudPlaylists] = useState<Playlist[]>([]);
  const [cloudServerInfo, setCloudServerInfo] = useState<PlexServerConnection | undefined>(undefined);
  
  const [loadingLocal, setLoadingLocal] = useState(false);
  const [loadingCloud, setLoadingCloud] = useState(false);

  // Sync State
  const [syncState, setSyncState] = useState<SyncState>(SyncState.IDLE);

  // Animation Refs
  const { leftYellowRef, leftGreenRef, rightYellowRef, rightGreenRef } = useStripeAnimation(syncState);

  // Abort Controllers for Refresh Actions
  const localAbortRef = useRef<AbortController | null>(null);
  const cloudAbortRef = useRef<AbortController | null>(null);

  // Connection Modal State
  const [isConnectionModalOpen, setIsConnectionModalOpen] = useState(false);

  // Strategy State
  const [currentStrategy, setCurrentStrategy] = useState<SyncStrategy>(SyncStrategy.LOCAL_OVERWRITE);
  
  // Path Mapping State (Includes Simple and Regex Rules)
  const [pathMappingConfig, setPathMappingConfig] = useState<PathMappingConfig>({
    mode: PathMappingMode.SIMPLE,
    simple: [],
    regex: {
      localPre: [],
      localPost: [],
      remotePre: [],
      remotePost: []
    }
  });

  // Schedule State
  const [scheduleSettings, setScheduleSettings] = useState<ScheduleSettings>({
    mode: ScheduleMode.DISABLED,
    cronExpression: '',
    dailyTime: '02:00',
    weeklyDays: [0], // Sunday
    weeklyTime: '03:00',
    autoWatch: false
  });

  // Backup State
  const [backupSettings, setBackupSettings] = useState<BackupSettings>({
    enabled: false,
    retentionCount: 5
  });

  // Toast Notification System
  const [toasts, setToasts] = useState<Toast[]>([]);
  const timeoutsRef = useRef<{[key: number]: ReturnType<typeof setTimeout>}>({});

  const removeToast = (id: number) => {
    setToasts(prev => prev.filter(t => t.id !== id));
    if (timeoutsRef.current[id]) {
      clearTimeout(timeoutsRef.current[id]);
      delete timeoutsRef.current[id];
    }
  };

  const addToast = (message: string) => {
    const id = Date.now();
    // Start with entering: true to position it above
    const newToast: Toast = { id, message, exiting: false, entering: true };
    
    setToasts(prev => {
      // Mark all existing toasts as exiting immediately so they slide up
      const exitingToasts = prev.map(t => ({ ...t, exiting: true, entering: false }));
      return [...exitingToasts, newToast];
    });

    // Auto dismiss the new toast after 3 seconds
      const dismissTimer = setTimeout(() => {
      setToasts(prev => prev.map(t => t.id === id ? { ...t, exiting: true } : t));
    }, TOAST_AUTO_DISMISS_MS);
    
    timeoutsRef.current[id] = dismissTimer;
  };

  // Effect to trigger the "slide down" animation
  useEffect(() => {
    const enteringIds = toasts.filter(t => t.entering).map(t => t.id);
    
    if (enteringIds.length > 0) {
      let raf1: number;
      let raf2: number;

      raf1 = requestAnimationFrame(() => {
        raf2 = requestAnimationFrame(() => {
          setToasts(prev => prev.map(t => 
            enteringIds.includes(t.id) ? { ...t, entering: false } : t
          ));
        });
      });
      
      return () => {
        cancelAnimationFrame(raf1);
        cancelAnimationFrame(raf2);
      };
    }
  }, [toasts]);

  // Cleanup effect for exiting toasts
  useEffect(() => {
    const exitingToasts = toasts.filter(t => t.exiting);
    exitingToasts.forEach(t => {
      if (!timeoutsRef.current[`remove-${t.id}`]) {
        timeoutsRef.current[`remove-${t.id}`] = setTimeout(() => {
          removeToast(t.id);
          delete timeoutsRef.current[`remove-${t.id}`];
        }, TOAST_EXIT_DURATION_MS);
      }
    });
  }, [toasts]);

  // Fetch Local Playlists
  const refreshLocal = useCallback(async () => {
    if (localAbortRef.current) localAbortRef.current.abort();
    const abortController = new AbortController();
    localAbortRef.current = abortController;

    setLoadingLocal(true);
    const result = await apiService.getPlaylists(ServerType.LOCAL, abortController.signal);
    if (result.status === 'success') {
      setLocalPlaylists(result.data);
    }
    setLoadingLocal(false);
    localAbortRef.current = null;
  }, []);

  const cancelLocalRefresh = () => {
    if (localAbortRef.current) {
      localAbortRef.current.abort();
      localAbortRef.current = null;
      setLoadingLocal(false);
      addToast("Local refresh cancelled.");
    }
  };

  // Fetch Cloud Playlists and Info
  const refreshCloud = useCallback(async () => {
    if (cloudAbortRef.current) cloudAbortRef.current.abort();
    const abortController = new AbortController();
    cloudAbortRef.current = abortController;

    setLoadingCloud(true);
    // Fetch playlists
    const playlistResult = await apiService.getPlaylists(ServerType.CLOUD, abortController.signal);
    if (!abortController.signal.aborted) {
      if (playlistResult.status === 'success') {
        setCloudPlaylists(playlistResult.data);
      }
      
      // Fetch server info
      const infoResult = await apiService.getServerStatus(abortController.signal);
      if (infoResult.status === 'success') {
        setCloudServerInfo(infoResult.data);
      }
      
      setLoadingCloud(false);
      cloudAbortRef.current = null;
    }
  }, []);

  const cancelCloudRefresh = () => {
    if (cloudAbortRef.current) {
      cloudAbortRef.current.abort();
      cloudAbortRef.current = null;
      setLoadingCloud(false);
      addToast("Cloud refresh cancelled.");
    }
  };

  // Initial Load
  useEffect(() => {
    refreshLocal();
    refreshCloud();
    return () => {
      // Cleanup on unmount
      if (localAbortRef.current) localAbortRef.current.abort();
      if (cloudAbortRef.current) cloudAbortRef.current.abort();
    }
  }, [refreshLocal, refreshCloud]);

  // Handle Strategy Change
  const handleStrategyChange = (strategy: SyncStrategy, label: string) => {
    setCurrentStrategy(strategy);
    addToast(`Selected strategy "${label}" has been saved.`);
  };

  // Handle Path Mapping Save
  const handleSavePathMapping = (config: PathMappingConfig) => {
    setPathMappingConfig(config);
    addToast('Path mapping rules have been saved.');
  };

  // Handle Backup Settings Save
  const handleSaveBackupSettings = async (settings: BackupSettings) => {
    const result = await apiService.saveBackupSettings(settings);
    if (result.status === 'success') {
      setBackupSettings(settings);
      addToast('Backup settings have been saved.');
    } else {
      addToast('Failed to save backup settings.');
    }
  };

  // Handle Schedule Save
  const handleSaveSchedule = async (settings: ScheduleSettings): Promise<boolean> => {
    // Call API (validation happens in Mock)
    const result = await apiService.saveScheduleSettings(settings);
    
    if (result.status === 'success') {
       // Only update local state if successful
       setScheduleSettings(settings);

       if (settings.mode === ScheduleMode.DISABLED) {
          addToast("Scheduled tasks disabled.");
       } else if (settings.mode === ScheduleMode.CRON && settings.cronExpression.trim() === '') {
          addToast("Scheduled tasks disabled (Empty Cron).");
       } else {
          addToast("Scheduled task started successfully.");
       }
       return true;
    } else {
       addToast(result.message || "Failed to update schedule.");
       return false;
    }
  };

  // Handle Sync Trigger
  const handleSyncTrigger = async () => {
    if (syncState !== SyncState.IDLE) return;
    
    setSyncState(SyncState.SYNCING);
    
    // Note: We deliberately do not clear playlists here to keep UI populated during sync
    const result = await apiService.syncPlaylists(currentStrategy, pathMappingConfig);
    
    if (result.status === 'success') {
      // Transition to Success state
      setSyncState(SyncState.SUCCESS);
      
      // Timing Breakdown:
      // T+0.0s: State is SUCCESS. 
      //         - JS Animation loop detects change and begins decelerating speed from 56 -> 0 over 0.5s.
      //         - CSS opacity transitions Yellow -> Green over 0.3s.
      
      // T+0.5s: Deceleration complete. Speed is 0. Background is static.
      //         We hold this static state for another 0.5s.
      
      // T+1.0s: Total success duration complete. Disappear.
        setTimeout(() => {
          setSyncState(SyncState.IDLE);
          refreshLocal();
          refreshCloud();
        }, SYNC_SUCCESS_TOTAL_MS);

    } else {
      setSyncState(SyncState.ERROR);
      addToast("Sync failed. Please check connection.");
      setTimeout(() => setSyncState(SyncState.IDLE), SYNC_ERROR_RESET_MS);
    }
  };

  const handleConnectSuccess = (serverInfo: PlexServerConnection) => {
    setCloudServerInfo(serverInfo);
    // Refresh playlists after new connection
    refreshCloud(); 
  };

  const getToastStyles = (toast: Toast): React.CSSProperties => {
    if (toast.exiting || toast.entering) {
      return {
        opacity: 0,
        transform: 'translateY(-40px) scale(0.95)',
      };
    }
    return {
      opacity: 1,
      transform: 'translateY(0) scale(1)',
    };
  };

  const getToastClasses = () => {
    return "absolute top-2 flex items-center space-x-2 px-4 py-2 rounded-full shadow-lg border text-sm font-medium pointer-events-auto bg-gray-800 text-plex-orange border-plex-orange/30 transition-all duration-300 ease-out origin-top z-50 backdrop-blur-md";
  };

  const isConnected = cloudServerInfo?.isConnected;

  // Helper: Calculate Next Run Info
  const getScheduleDisplayInfo = (settings: ScheduleSettings) => {
    const result = { 
        label: 'Schedule', 
        value: 'Not configured', 
        active: false,
        autoWatch: settings.autoWatch 
    };

    if (settings.mode === ScheduleMode.DISABLED) {
      result.label = 'Auto-Sync';
      result.value = 'Disabled';
      return result;
    }

    if (settings.mode === ScheduleMode.CRON) {
      result.label = 'Cron Schedule';
      result.value = settings.cronExpression || 'Pending...';
      result.active = true;
      return result;
    }

    const now = new Date();
    const days = ['Sun', 'Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat'];
    let nextRun: Date | null = null;
    let timeStr = '';

    if (settings.mode === ScheduleMode.DAILY) {
       const [h, m] = settings.dailyTime.split(':').map(Number);
       const target = new Date();
       target.setHours(h, m, 0, 0);
       timeStr = settings.dailyTime;
       
       if (now < target) {
         nextRun = target;
       } else {
         const tomorrow = new Date();
         tomorrow.setDate(tomorrow.getDate() + 1);
         tomorrow.setHours(h, m, 0, 0);
         nextRun = tomorrow;
       }
    } else if (settings.mode === ScheduleMode.WEEKLY) {
       timeStr = settings.weeklyTime;
       const [h, m] = settings.weeklyTime.split(':').map(Number);
       const activeDays = [...settings.weeklyDays].sort();
       
       if (activeDays.length === 0) {
           result.label = 'Weekly Schedule';
           result.value = 'No days selected';
           return result;
       }

       // Check rest of today
       if (activeDays.includes(now.getDay())) {
          const todayTarget = new Date();
          todayTarget.setHours(h, m, 0, 0);
          if (todayTarget > now) {
            nextRun = todayTarget;
          }
       }

       // Check future days
       if (!nextRun) {
         for (let i = 1; i <= 7; i++) {
           const nextDayIndex = (now.getDay() + i) % 7;
           if (activeDays.includes(nextDayIndex)) {
             const d = new Date();
             d.setDate(now.getDate() + i);
             d.setHours(h, m, 0, 0);
             nextRun = d;
             break;
           }
         }
       }
    }

    if (nextRun) {
       // Format logic
       const isToday = nextRun.getDate() === now.getDate() && nextRun.getMonth() === now.getMonth();
       const isTomorrow = new Date(now.getTime() + 86400000).getDate() === nextRun.getDate();
       
       let dateStr = '';
       if (isToday) dateStr = 'Today';
       else if (isTomorrow) dateStr = 'Tomorrow';
       else dateStr = days[nextRun.getDay()];

       result.label = `${settings.mode === ScheduleMode.DAILY ? 'Daily' : 'Weekly'} Schedule`;
       result.value = `${dateStr} at ${timeStr}`;
       result.active = true;
       return result;
    }

    return result;
  };

  const scheduleInfo = getScheduleDisplayInfo(scheduleSettings);

  // Helper: Calculate Path Mapping Info
  const getPathMappingDisplayInfo = (config: PathMappingConfig) => {
    let count = 0;
    let modeLabel = '';
    let Icon = Type;

    if (config.mode === PathMappingMode.SIMPLE) {
        modeLabel = 'Simple';
        count = config.simple.length;
        Icon = Type;
    } else {
        modeLabel = 'Regex';
        count = config.regex.localPre.length +
                config.regex.localPost.length + 
                config.regex.remotePre.length + 
                config.regex.remotePost.length;
        Icon = Code2;
    }

    if (count === 0) {
        return {
            label: 'Path Mapping',
            value: 'Not Set',
            active: false,
            Icon: Icon
        };
    }

    return {
        label: 'Path Mapping',
        value: `${modeLabel} (${count})`,
        active: true,
        Icon: Icon
    };
  };

  const pathMappingInfo = getPathMappingDisplayInfo(pathMappingConfig);

  return (
    <div className="min-h-screen flex flex-col bg-gray-900 text-gray-100 font-sans overflow-hidden bg-[radial-gradient(ellipse_at_top,_var(--tw-gradient-stops))] from-gray-800 via-gray-900 to-black">
      
      {/* App Header */}
      <header className={`flex-none shadow-md z-20 relative backdrop-blur-md transition-all duration-500 ease-in-out h-16 ${syncState === SyncState.IDLE ? 'bg-gray-800/80 border-b border-white/5' : 'bg-black border-none'}`}>
        
        {/* Syncing/Success Animated Background Layer */}
        {syncState !== SyncState.IDLE && (
          <div className="absolute inset-0 w-full h-full overflow-hidden bg-black">
            
            {/* Left Side: Gradient 135deg (TR -> BL /), Anchored RIGHT (Center). Moves LEFT (Right offset increases). */}
            <div className="absolute left-0 top-0 bottom-0 w-1/2 overflow-hidden z-0">
              {/* Layer 1: Yellow (Syncing) */}
              <div 
                ref={leftYellowRef}
                className={`absolute inset-0 transition-opacity duration-300 ease-out ${syncState === SyncState.SUCCESS ? 'opacity-0' : 'opacity-100'}`}
                style={{
                  backgroundPosition: 'right 0 top 0',
                  backgroundImage: `repeating-linear-gradient(135deg, transparent, transparent 20px, #e5a00d 20px, #e5a00d 40px)`,
                  backgroundSize: STRIPE_BACKGROUND_SIZE,
                }}
              />
              {/* Layer 2: Green (Success) - Fade In */}
              <div 
                ref={leftGreenRef}
                className={`absolute inset-0 transition-opacity duration-300 ease-out ${syncState === SyncState.SUCCESS ? 'opacity-100' : 'opacity-0'}`}
                style={{
                  backgroundPosition: 'right 0 top 0',
                  backgroundImage: `repeating-linear-gradient(135deg, transparent, transparent 20px, #22c55e 20px, #22c55e 40px)`,
                  backgroundSize: STRIPE_BACKGROUND_SIZE,
                }}
              />
            </div>

            {/* Right Side: Gradient 225deg (TL -> BR \), Anchored LEFT (Center). Moves RIGHT (Left offset increases). */}
            <div className="absolute right-0 top-0 bottom-0 w-1/2 overflow-hidden z-0">
               {/* Layer 1: Yellow (Syncing) */}
              <div 
                ref={rightYellowRef}
                className={`absolute inset-0 transition-opacity duration-300 ease-out ${syncState === SyncState.SUCCESS ? 'opacity-0' : 'opacity-100'}`}
                style={{
                  backgroundPosition: 'left 0 top 0',
                  backgroundImage: `repeating-linear-gradient(225deg, transparent, transparent 20px, #e5a00d 20px, #e5a00d 40px)`,
                  backgroundSize: STRIPE_BACKGROUND_SIZE,
                }}
              />
              {/* Layer 2: Green (Success) - Fade In */}
              <div 
                ref={rightGreenRef}
                className={`absolute inset-0 transition-opacity duration-300 ease-out ${syncState === SyncState.SUCCESS ? 'opacity-100' : 'opacity-0'}`}
                style={{
                  backgroundPosition: 'left 0 top 0',
                  backgroundImage: `repeating-linear-gradient(225deg, transparent, transparent 20px, #22c55e 20px, #22c55e 40px)`,
                  backgroundSize: STRIPE_BACKGROUND_SIZE,
                }}
              />
            </div>
          </div>
        )}

        {/* Content Container */}
        <div className="relative max-w-7xl mx-auto px-4 md:px-6 h-full flex items-center justify-between">
          
          {syncState === SyncState.IDLE ? (
            <>
              {/* Normal Toolbar Left */}
              <div className="flex items-center space-x-3">
                <div className="p-1.5 rounded-lg shadow-lg bg-gradient-to-br from-plex-orange to-yellow-600 text-gray-900 shadow-plex-orange/20">
                   <ArrowLeftRight size={24} strokeWidth={2.5} />
                </div>
                <h1 className="text-xl font-bold tracking-tight text-white">
                  Plex<span className="text-plex-orange">Sync</span>
                </h1>
              </div>
              
              {/* Normal Toolbar Right */}
              <div className="flex items-center gap-4">
                  {/* Path Mapping Info */}
                  <div className="flex flex-col items-end hidden md:flex border-r border-gray-700/50 pr-4 mr-1">
                     <span className="text-[10px] uppercase font-bold text-gray-500 tracking-wider">
                       {pathMappingInfo.label}
                     </span>
                     <div className={`text-xs font-mono flex items-center gap-1.5 ${pathMappingInfo.active ? 'text-plex-orange' : 'text-gray-600'}`}>
                        {pathMappingInfo.active && <pathMappingInfo.Icon size={12} />}
                        <span>{pathMappingInfo.value}</span>
                     </div>
                  </div>

                  {/* Schedule Info */}
                  <div className="flex flex-col items-end mr-2 md:mr-0 hidden md:flex">
                     <span className="text-[10px] uppercase font-bold text-gray-500 tracking-wider">
                       {scheduleInfo.label}
                     </span>
                     <div className="text-xs font-mono flex items-center gap-1.5">
                       {/* Schedule Part */}
                       <div className={`flex items-center gap-1.5 ${scheduleInfo.active ? 'text-plex-orange' : 'text-gray-600'}`}>
                          {scheduleInfo.active && <Clock size={12} />}
                          <span>{scheduleInfo.value}</span>
                       </div>

                       {/* Watch Part */}
                       <span className="text-gray-700 mx-0.5">|</span>
                       <div 
                         className={`flex items-center gap-1 ${scheduleInfo.autoWatch ? 'text-plex-orange' : 'text-gray-600'}`} 
                         title={scheduleInfo.autoWatch ? "Local Playlist Monitoring Enabled" : "Local Playlist Monitoring Disabled"}
                       >
                           {scheduleInfo.autoWatch ? <Eye size={12} /> : <EyeOff size={12} />}
                           <span className="text-[10px] font-sans font-bold">WATCH</span>
                       </div>
                     </div>
                  </div>

                  {/* Connection Status Button */}
                  <button 
                    onClick={() => setIsConnectionModalOpen(true)}
                    className={`flex items-center justify-center w-9 h-9 rounded-full border transition-all duration-300 hover:scale-105 active:scale-95 shadow-md 
                      ${isConnected 
                        ? "bg-green-500/10 border-green-500/50 text-green-400 hover:bg-green-500/20 hover:shadow-green-500/20"
                        : "bg-red-500/10 border-red-500/50 text-red-400 hover:bg-red-500/20 hover:shadow-red-500/20"
                      }`}
                    title={isConnected ? "Connected to Plex" : "Disconnected"}
                  >
                    {isConnected ? <Server size={18} /> : <ServerOff size={18} />}
                  </button>
              </div>
            </>
          ) : (
            /* Syncing / Success Text Banner */
            <div className="absolute inset-0 flex items-center justify-center pointer-events-none z-10">
               <div
                 className="bg-black shadow-none rounded-none border-none"
                 style={{
                   padding: `${SYNC_BANNER_PADDING_Y}px ${SYNC_BANNER_PADDING_X}px`,
                   minWidth: `${SYNC_BANNER_MIN_WIDTH}px`,
                 }}
               >
                  <h1 className={`text-xl md:text-2xl font-black tracking-[0.2em] uppercase whitespace-nowrap transition-colors duration-300 ${syncState === SyncState.SUCCESS ? 'text-[#22c55e]' : 'text-[#F59E0B]'}`}>
                    {syncState === SyncState.SYNCING ? 'SYNCHRONIZING' : 'SYNC COMPLETE'}
                  </h1>
               </div>
            </div>
          )}
          
        </div>
      </header>

      {/* Notification Toasts Container */}
      <div className="fixed top-20 left-0 right-0 flex justify-center h-0 overflow-visible z-[100] pointer-events-none">
        {toasts.map((toast) => (
          <div 
            key={toast.id}
            className={getToastClasses()}
            style={getToastStyles(toast)}
          >
              <ShieldCheck size={16} />
              <span>{toast.message}</span>
              <button 
                onClick={() => setToasts(prev => prev.map(t => t.id === toast.id ? { ...t, exiting: true } : t))}
                className="ml-2 hover:text-white transition-colors"
              >
                <X size={14} />
              </button>
          </div>
        ))}
      </div>

      {/* Main Content Area */}
      <main className="flex-1 overflow-hidden relative z-10">
        {/* Reduced gap from gap-3/gap-6 to gap-2/gap-3 for tighter layout */}
        <div className="absolute inset-0 flex flex-col md:flex-row max-w-7xl mx-auto p-4 md:p-6 gap-2 md:gap-3">
          
          {/* Left Column - Local */}
          <div className="flex-1 min-h-0 h-full w-full">
            <ServerPanel 
              type={ServerType.LOCAL}
              playlists={localPlaylists}
              isLoading={loadingLocal}
              onRefresh={refreshLocal}
              onCancel={cancelLocalRefresh}
            />
          </div>

          {/* Strategy Selector - Positioned specifically between headers */}
          <div className="absolute 
              z-30
              /* Mobile Positioning: Center Vertically, Anchored Right */
              top-1/2 right-[52px] transform translate-x-1/2 -translate-y-1/2
              
              /* Desktop Positioning: Center Horizontally, Anchored Top */
              md:top-[64px] md:right-auto md:left-1/2 md:transform md:-translate-x-1/2 md:-translate-y-1/2"
          >
              <StrategySelector 
                currentStrategy={currentStrategy}
                onSelect={handleStrategyChange}
                savedPathMapping={pathMappingConfig}
                onSavePathMapping={handleSavePathMapping}
                savedBackup={backupSettings}
                onSaveBackup={handleSaveBackupSettings}
                savedSchedule={scheduleSettings}
                onSaveSchedule={handleSaveSchedule}
                syncState={syncState}
                onSync={handleSyncTrigger}
              />
          </div>

          {/* Right Column - Cloud */}
          <div className="flex-1 min-h-0 h-full w-full">
            <ServerPanel 
              type={ServerType.CLOUD}
              playlists={cloudPlaylists}
              isLoading={loadingCloud}
              onRefresh={refreshCloud}
              onCancel={cancelCloudRefresh}
              serverInfo={cloudServerInfo}
            />
          </div>

        </div>
      </main>
      
      {/* Footer */}
      <footer className="flex-none py-4 text-center text-xs text-gray-600 border-t border-white/5 bg-gray-900/50 backdrop-blur">
        <p>&copy; {new Date().getFullYear()} PlexSync Manager. Connected to Docker backend.</p>
      </footer>

      {/* Modals */}
      <ConnectionModal 
        isOpen={isConnectionModalOpen} 
        onClose={() => setIsConnectionModalOpen(false)}
        onConnectSuccess={handleConnectSuccess}
        onShowMessage={addToast}
      />
    </div>
  );
};

export default App;