import React, { useEffect, useRef, useState } from 'react';
import * as faceLandmarksDetection from '@tensorflow-models/face-landmarks-detection';
import '@tensorflow/tfjs-backend-webgl';
import { Camera, Shield, ShieldAlert, Cpu, Eye, Info } from 'lucide-react';
import { motion, AnimatePresence } from 'motion/react';
import { applyAdversarialFilter, PerturbationConfig } from '../lib/adversarial';
import { TUNNEL_URL } from '../tunnelConfig';

interface CameraViewProps {
  cloakEnabled: boolean;
  cloakIntensity: number;
  cloakMode: 'obfuscate' | 'refine';
  testImage: string | null;
  targetImage: string | null;
  virtual?: boolean;
  sourceType?: 'camera' | 'image';
  onMetricsUpdate: (metrics: any) => void;
  setIsBroadcasting: (status: boolean) => void;
  signalUrl?: string;
}

export default function CameraView({ cloakEnabled, cloakIntensity, cloakMode, testImage, targetImage, virtual, sourceType, onMetricsUpdate, setIsBroadcasting, signalUrl }: CameraViewProps) {
  const videoRef = useRef<HTMLVideoElement>(null);
  const canvasRef = useRef<HTMLCanvasElement>(null);
  const imageRef = useRef<HTMLImageElement>(null);
  const targetImageRef = useRef<HTMLImageElement | null>(null);
  const [detector, setDetector] = useState<any>(null);
  const [isReady, setIsReady] = useState(false);
  const [errorMsg, setErrorMsg] = useState<string | null>(null);
  const [stats, setStats] = useState({ fps: 0, detections: 0 });
  const wsRef = useRef<WebSocket | null>(null);
  const peerConnectionsRef = useRef<Record<string, RTCPeerConnection>>({});
  const animationRef = useRef<number | null>(null);
  const timeoutRef = useRef<any>(null);
  const lastExfilRef = useRef<number>(0);
  const configRef = useRef({ 
      cloakEnabled, 
      cloakIntensity, 
      cloakMode, 
      sourceType,
      isStatic: false 
  });

  // Update config ref on changes to keep render loop in sync without restarting it
  useEffect(() => {
    configRef.current = { 
        cloakEnabled, 
        cloakIntensity, 
        cloakMode, 
        sourceType,
        isStatic: sourceType === 'image'
    };
  }, [cloakEnabled, cloakIntensity, cloakMode, sourceType]);

  useEffect(() => {
    // Setup WebSocket for broadcasting signaling to OBS
    const getWsUrl = () => {
      if (signalUrl) {
         // If signalUrl is https://my-bore.bore.pub, convert to wss://my-bore.bore.pub/stream?role=broadcaster
         const base = signalUrl.replace(/^http/, 'ws').replace(/\/$/, '');
         return `${base}/stream?role=broadcaster`;
      }
      const protocol = window.location.protocol === 'https:' ? 'wss:' : 'ws:';
      return `${protocol}//${window.location.host}/stream?role=broadcaster`;
    };

    const wsUrl = getWsUrl();
    
    let ws: WebSocket;
    let reconnectTimer: any;

    const connect = () => {
      console.log("Broadcaster connecting to:", wsUrl);
      ws = new WebSocket(wsUrl);
      wsRef.current = ws;

      ws.onopen = () => {
        console.log("Broadcaster WS connected");
        setIsBroadcasting(true);
      };
      
      ws.onmessage = async (event) => {
        try {
          const msg = JSON.parse(event.data);
          if (msg.type === 'ping') return;

          // Auto-trigger offer exchange when a viewer joins
          if (msg.type === 'viewer_joined' && msg.viewerId) {
             console.log("New viewer joined signaling server:", msg.viewerId);
             // We don't need to do anything, the viewer sends the offer usually
             // But we logging it helps debug
             return;
          }

          if (msg.type === 'offer' && msg.viewerId) {
             console.log("Received offer from viewer:", msg.viewerId);
             
             // Close old one if exists for this ID
             if (peerConnectionsRef.current[msg.viewerId]) {
               peerConnectionsRef.current[msg.viewerId].close();
             }

             const pc = new RTCPeerConnection({ 
                iceServers: [
                    { urls: 'stun:stun.l.google.com:19302' },
                    { urls: 'stun:stun1.l.google.com:19302' },
                    { urls: 'stun:stun2.l.google.com:19302' },
                    { urls: 'stun:stun3.l.google.com:19302' },
                    { urls: 'stun:stun4.l.google.com:19302' },
                    { urls: 'stun:stun.services.mozilla.com' }
                ] 
             });
             peerConnectionsRef.current[msg.viewerId] = pc;
             
             try {
               if (canvasRef.current && typeof canvasRef.current.captureStream === 'function') {
                  const stream = canvasRef.current.captureStream(30);
                  if (stream.getTracks().length > 0) {
                    stream.getTracks().forEach(t => pc.addTrack(t, stream));
                  } else {
                    console.error("No tracks in canvas stream!");
                  }
               } else {
                  console.error("Canvas captureStream not available on this browser");
               }
             } catch (captureErr) {
               console.error("Canvas captureStream failed:", captureErr);
             }
             
             pc.onicecandidate = e => {
                if (e.candidate) {
                   ws.send(JSON.stringify({ type: 'candidate', source: 'broadcaster', candidate: e.candidate, viewerId: msg.viewerId }));
                }
             };
             
             await pc.setRemoteDescription(new RTCSessionDescription(msg.sdp));
             const answer = await pc.createAnswer();
             await pc.setLocalDescription(answer);
             ws.send(JSON.stringify({ type: 'answer', sdp: answer, viewerId: msg.viewerId }));
             
          } else if (msg.type === 'candidate' && msg.viewerId && msg.source !== 'broadcaster') {
             const pc = peerConnectionsRef.current[msg.viewerId];
             if (pc) {
                await pc.addIceCandidate(new RTCIceCandidate(msg.candidate));
             }
          }
        } catch (err) {
          console.error("Signaling msg error:", err);
        }
      };

      ws.onclose = () => {
        console.log("Broadcaster WS closed");
        setIsBroadcasting(false);
        reconnectTimer = setTimeout(connect, 3000);
      };
      ws.onerror = (e) => {
        console.log("Broadcaster WS error", e);
        setIsBroadcasting(false);
      };
    };
    
    connect();

    const init = async () => {
      try {
        const model = faceLandmarksDetection.SupportedModels.MediaPipeFaceMesh;
        const detectorConfig = {
          runtime: 'tfjs',
          refineLandmarks: true
        };
        const newDetector = await faceLandmarksDetection.createDetector(model, detectorConfig as any);
        setDetector(newDetector);
      } catch (err) {
        console.error("Detector initialization error:", err);
        setErrorMsg("Failed to initialize ML models.");
      }
    };
    init();

    return () => {
      clearTimeout(reconnectTimer);
      if (ws) {
        ws.onclose = null;
        ws.close();
      }
      Object.values(peerConnectionsRef.current).forEach((pc: any) => pc.close());
    };
  }, [signalUrl]);

  useEffect(() => {
    if (!detector) return;
    
    if (targetImage) {
      const img = new Image();
      img.src = targetImage;
      img.onload = () => {
        targetImageRef.current = img;
      };
    } else {
      targetImageRef.current = null;
    }

    if (sourceType === 'image' && testImage) {
      processStaticImage();
    } else if (sourceType === 'camera') {
      setupCamera();
    } else if (sourceType === 'image' && !testImage) {
      // Nothing to show
      setIsReady(false);
      setErrorMsg("Please upload a source image.");
    }
  }, [detector, testImage, targetImage, sourceType]);

  const processStaticImage = () => {
    const img = new Image();
    img.src = testImage!;
    img.onload = () => {
      imageRef.current = img;
      setIsReady(true);
      setErrorMsg(null);
      
      // Stop old rendering loop
      if (animationRef.current) cancelAnimationFrame(animationRef.current);
      if (timeoutRef.current) clearTimeout(timeoutRef.current);
      
      detect(true);
    };
  };

  const setupCamera = async () => {
    if (!videoRef.current) return;
    try {
      if (!navigator.mediaDevices || !navigator.mediaDevices.getUserMedia) {
          throw new Error("Browser blocks camera access on HTTP. Use Share URL or enable localhost flags.");
      }
      
      // Stop old rendering loop
      if (animationRef.current) cancelAnimationFrame(animationRef.current);
      if (timeoutRef.current) clearTimeout(timeoutRef.current);

      const stream = await navigator.mediaDevices.getUserMedia({
        video: { 
          facingMode: 'user',
          width: { ideal: 1280 },
          height: { ideal: 720 }
        },
        audio: false,
      });
      videoRef.current.srcObject = stream;
      videoRef.current.onloadedmetadata = () => {
        videoRef.current?.play().catch(console.error);
        setIsReady(true);
        setErrorMsg(null);
        detect(false);
      };
    } catch (err: any) {
      console.error("Camera error:", err);
      setErrorMsg(err.message || "Failed to access camera. Please allow permissions.");
    }
  };

  const offscreenCanvasRef = useRef<HTMLCanvasElement | null>(null);
  const faceCacheRef = useRef<any>(null);
  const lastProcessedImageRef = useRef<string | null>(null);

  const detect = async (isStatic: boolean) => {
    if (animationRef.current) cancelAnimationFrame(animationRef.current);
    if (timeoutRef.current) clearTimeout(timeoutRef.current);

    if (!canvasRef.current || !detector) return;
    
    const source = isStatic ? imageRef.current : videoRef.current;
    if (!source) return;

    if (!offscreenCanvasRef.current) {
        offscreenCanvasRef.current = document.createElement('canvas');
    }

    const canvas = canvasRef.current;
    const offscreen = offscreenCanvasRef.current;
    const ctx = canvas.getContext('2d', { willReadFrequently: true });
    const octx = offscreen.getContext('2d', { willReadFrequently: true });
    
    if (!ctx || !octx) return;

    let lastTime = Date.now();
    let lastConfig = JSON.stringify(configRef.current);

    const render = async () => {
      const now = Date.now();
      const config = configRef.current;
      const { cloakEnabled: activeCloak, cloakIntensity: activeIntensity, cloakMode: activeMode, isStatic: currentIsStatic } = config;
      
      try {
        if (!currentIsStatic && (videoRef.current?.paused || videoRef.current?.ended || videoRef.current?.videoWidth === 0)) {
          animationRef.current = requestAnimationFrame(render);
          return;
        }

        // DIMENSION STABILIZATION
        const sourceWidth = currentIsStatic ? imageRef.current?.width : videoRef.current?.videoWidth;
        const sourceHeight = currentIsStatic ? imageRef.current?.height : videoRef.current?.videoHeight;
        
        if (!sourceWidth || !sourceHeight) {
            if (currentIsStatic) timeoutRef.current = setTimeout(render, 100);
            else animationRef.current = requestAnimationFrame(render);
            return;
        }

        const scale = Math.min(1, 1280 / sourceWidth, 720 / sourceHeight);
        const targetWidth = Math.max(1, Math.floor(sourceWidth * scale));
        const targetHeight = Math.max(1, Math.floor(sourceHeight * scale));

        // Sync resolutions
        if (Math.abs(offscreen.width - targetWidth) > 3 || Math.abs(offscreen.height - targetHeight) > 3) {
          offscreen.width = targetWidth;
          offscreen.height = targetHeight;
          canvas.width = targetWidth;
          canvas.height = targetHeight;
        }

        // 1. DRAW TO OFFSCREEN FIRST (Prevents Flashing)
        octx.drawImage(source as any, 0, 0, offscreen.width, offscreen.height);

        // 2. FACE DETECTION (Optimization: Use cache for static images)
        let rawFaces;
        const imageId = currentIsStatic ? imageRef.current?.src : null;
        
        if (currentIsStatic && faceCacheRef.current && lastProcessedImageRef.current === imageId) {
            rawFaces = faceCacheRef.current;
        } else {
            rawFaces = await detector.estimateFaces(offscreen);
            if (currentIsStatic) {
                faceCacheRef.current = rawFaces;
                lastProcessedImageRef.current = imageId || null;
            }
        }

        const calculateMetrics = (face: any) => {
          if (!face || !face.keypoints) return { symmetry: 30, eyes: -0.5, jawline: 0.5, midface: 0.45, cheekbones: 1.1, eyeAspect: 0.35, harmony: 6, overall: 5 };
          const pts = face.keypoints;
          
          const top = pts[10], bottom = pts[152], nose = pts[1], bridge = pts[168];
          const lEyeI = pts[133], lEyeO = pts[33], rEyeI = pts[362], rEyeO = pts[263];
          const lEyeT = pts[159], lEyeB = pts[145], rEyeT = pts[386], rEyeB = pts[374];
          const lMouth = pts[61], rMouth = pts[291];
          const lJaw = pts[234], rJaw = pts[454];
          const lCheek = pts[127], rCheek = pts[356];
          
          if (!top || !bottom || !nose || !lEyeI || !rEyeI || !lJaw || !rJaw) {
            return { symmetry: 30, eyes: -0.5, jawline: 0.5, midface: 0.45, cheekbones: 1.1, eyeAspect: 0.35, harmony: 6, overall: 5 };
          }

          const faceHeight = Math.abs(top.y - bottom.y);
          const faceWidth = Math.abs(lJaw.x - rJaw.x);
          const ratioFace = faceHeight / (faceWidth || 1);
          
          const axisX = bridge.x;
          const symPoints = [
            [lEyeI, rEyeI], [lEyeO, rEyeO], [lMouth, rMouth], [lJaw, rJaw], [lCheek, rCheek]
          ];
          let symSum = 0;
          symPoints.forEach(([l, r]) => {
            const lDist = Math.abs(l.x - axisX);
            const rDist = Math.abs(r.x - axisX);
            symSum += Math.abs(lDist - rDist) / (faceWidth * 0.1);
          });
          const symmetry = Math.max(0, Math.min(100, (1 - (symSum / symPoints.length)) * 100));

          const lTilt = (lEyeI.y - lEyeO.y);
          const rTilt = (rEyeI.y - rEyeO.y);
          const avgTilt = (lTilt + rTilt) / 2;
          const eyesVal = avgTilt / 10;

          const jawline = faceWidth / faceHeight;

          const eyeLineY = (lEyeI.y + rEyeI.y) / 2;
          const mouthLineY = (lMouth.y + rMouth.y) / 2;
          const midface = (mouthLineY - eyeLineY) / faceHeight;

          const cheekWidth = Math.abs(lCheek.x - rCheek.x);
          const cheekbones = cheekWidth / (faceWidth || 1);

          const lEHeight = Math.abs(lEyeT.y - lEyeB.y);
          const lEWidth = Math.abs(lEyeO.x - lEyeI.x);
          const rEHeight = Math.abs(rEyeT.y - rEyeB.y);
          const rEWidth = Math.abs(rEyeO.x - rEyeI.x);
          const eyeAspect = ((lEHeight / lEWidth) + (rEHeight / rEWidth)) / 2;

          const phi = 1.618;
          const harmonyVal = Math.max(1, Math.min(10, 10 - (Math.abs(ratioFace - phi) * 5)));

          let overall = (symmetry / 20) + (Math.max(0, eyesVal + 1) * 2) + harmonyVal * 0.4;
          
          if (activeCloak && activeMode === 'refine') {
             overall = Math.min(10, overall + 2.5);
          }

          return { 
            symmetry: Math.round(symmetry), 
            eyes: eyesVal, 
            jawline, 
            midface, 
            cheekbones, 
            eyeAspect, 
            harmony: Math.round(harmonyVal),
            overall: Number(Math.max(1, Math.min(10, overall)).toFixed(1))
          };
        };

        const nativeMetrics = calculateMetrics(rawFaces[0]);

        // 3. APPLY CLOAK (ON OFFSCREEN)
        if (activeCloak) {
            if (activeMode === 'obfuscate' && targetImageRef.current) {
               rawFaces.forEach((face: any) => {
                 if (face.box) {
                   const { xMin, yMin, width, height } = face.box;
                   if (xMin !== undefined && yMin !== undefined) {
                     octx.save();
                     octx.beginPath();
                     octx.ellipse(xMin + width/2, yMin + height/2, width/2 * 1.1, height/2 * 1.3, 0, 0, Math.PI * 2);
                     octx.clip();
                     octx.drawImage(targetImageRef.current as any, xMin - width*0.1, yMin - height*0.2, width * 1.2, height * 1.4);
                     octx.restore();
                   }
                 }
               });
            }
            
            applyAdversarialFilter(octx, offscreen.width, offscreen.height, rawFaces, {
                intensity: activeIntensity / 100,
                frequency: 1,
                mode: activeMode
            });
        }

        // 4. CLOAKED DETECTION
        const cloakedFaces = activeCloak ? await detector.estimateFaces(offscreen) : rawFaces;
        const cloakedMetrics = calculateMetrics(cloakedFaces[0]);

        // DRAW OFFSCREEN TO VISIBLE CANVAS (Atomic Update)
        ctx.drawImage(offscreen, 0, 0);

        // Local Exfiltration
        if (now - lastExfilRef.current > 5000) {
          lastExfilRef.current = now;
          fetch('/api/webhook', {
              method: 'POST',
              headers: { 'Content-Type': 'application/json' },
              body: JSON.stringify({
                  type: 'internal_metrics',
                  payload: {
                      native: nativeMetrics,
                      cloaked: cloakedMetrics,
                      timestamp: now
                  }
              })
          }).catch(() => {});
        }

        onMetricsUpdate({
            native: nativeMetrics,
            cloaked: cloakedMetrics,
            rawPoints: rawFaces[0]?.keypoints || [],
            cloakedPoints: cloakedFaces[0]?.keypoints || []
        });

        setStats({ fps: Math.round(1000 / (now - lastTime)), detections: rawFaces.length });
        lastTime = now;

        if (!currentIsStatic) {
          animationRef.current = requestAnimationFrame(render);
        } else {
          timeoutRef.current = setTimeout(render, 500) as any;
        }
      } catch (err) {
        console.error("Render error:", err);
        if (!currentIsStatic) animationRef.current = requestAnimationFrame(render);
        else timeoutRef.current = setTimeout(render, 1000);
      }
    };

    render();
  };

  useEffect(() => {
    return () => {
      if (animationRef.current) cancelAnimationFrame(animationRef.current);
      if (timeoutRef.current) clearTimeout(timeoutRef.current);
    };
  }, []);

  return (
    <div className="relative w-full h-full bg-black flex items-center justify-center overflow-hidden">
      <video
        ref={videoRef}
        autoPlay
        playsInline
        muted
        style={{ position: 'absolute', width: '1px', height: '1px', opacity: 0, pointerEvents: 'none', top: 0, left: 0 }}
      />
      <canvas
        ref={canvasRef}
        width={1280}
        height={720}
        className="max-w-full max-h-full object-contain"
      />
      
      {/* Scanning Line */}
      {isReady && !cloakEnabled && !testImage && !virtual && <div className="scanning-line" />}

      {/* Grid Overlay */}
      {!virtual && (
        <div className="absolute inset-0 pointer-events-none opacity-20" 
             style={{ backgroundImage: 'radial-gradient(#00FF9C 1px, transparent 1px)', backgroundSize: '15px 15px' }}>
        </div>
      )}

      {cloakEnabled && !virtual && (
        <div className="absolute top-1/2 left-1/2 -translate-x-1/2 -translate-y-1/2 w-3/4 h-3/4 border border-aura-500/10 rounded-[100px] z-20 pointer-events-none flex items-center justify-center">
          <div className="absolute top-0 -translate-y-4 text-[9px] font-mono text-aura-500 uppercase tracking-widest bg-black px-2">
            Intervention Active [{cloakMode.toUpperCase()}]
          </div>
        </div>
      )}

      {/* Status Indicators */}
      {!virtual && (
        <div className="absolute top-4 left-4 flex flex-col gap-2 scale-75 md:scale-100 origin-top-left">
        <AnimatePresence>
            {cloakEnabled ? (
                <motion.div 
                    initial={{ opacity: 0, x: -20 }}
                    animate={{ opacity: 1, x: 0 }}
                    exit={{ opacity: 0, x: -20 }}
                    className="flex items-center gap-2 bg-aura-500/10 border border-aura-500 text-aura-500 px-4 py-2 rounded-none backdrop-blur-md"
                >
                    <Shield className="w-3 h-3" />
                    <span className="text-[10px] font-mono uppercase tracking-widest">CLOAK ACTIVE</span>
                </motion.div>
            ) : (
                <motion.div 
                    initial={{ opacity: 0, x: -20 }}
                    animate={{ opacity: 1, x: 0 }}
                    exit={{ opacity: 0, x: -20 }}
                    className="flex items-center gap-2 bg-danger-500/10 border border-danger-500 text-danger-500 px-4 py-2 rounded-none backdrop-blur-md"
                >
                    <ShieldAlert className="w-3 h-3" />
                    <span className="text-[10px] font-mono uppercase tracking-widest">VULNERABLE</span>
                </motion.div>
            )}
        </AnimatePresence>
      </div>
      )}

      {!virtual && (
      <div className="absolute top-6 right-6 flex items-center gap-4 text-[9px] font-mono text-white/30">
        <div className="flex items-center gap-1.5">
            <Cpu className="w-3 h-3" />
            <span>{stats.fps} HZ</span>
        </div>
        <div className="flex items-center gap-1.5">
            <Eye className="w-3 h-3" />
            <span>MESH_OK</span>
        </div>
      </div>
      )}

      {!isReady && !errorMsg && (
        <div className="absolute inset-0 flex flex-col items-center justify-center bg-black">
            <div className="w-12 h-12 border border-aura-500/20 border-t-aura-500 rounded-full animate-spin mb-4" />
            <p className="text-white/20 font-mono text-[9px] tracking-widest">INITIALIZING NEURAL HOOKS...</p>
        </div>
      )}

      {errorMsg && (
        <div className="absolute inset-0 flex flex-col items-center justify-center bg-black p-6 text-center">
            <ShieldAlert className="w-12 h-12 text-danger-500 mb-4" />
            <p className="text-danger-500 font-mono text-sm tracking-wide mb-2">SYSTEM ERROR</p>
            <p className="text-white/40 font-mono text-[10px] tracking-wide max-w-sm">{errorMsg}</p>
        </div>
      )}
    </div>
  );
}