import React, { useState, useEffect, useRef } from "react";
import Hls from "hls.js";
import * as faceapi from "face-api.js";
import { Button } from "@/components/ui/button";
import { Camera } from "lucide-react";
import { useToast } from "@/hooks/use-toast";

const MODEL_URL = "https://cdn.jsdelivr.net/npm/@vladmandic/face-api/model";
const PADDING = 60;
const API_URL = "http://localhost:8081/start";

const RtspStream: React.FC = () => {
  const [rtspUrl, setRtspUrl] = useState<string>("");
  const [cameraName, setCameraName] = useState<string>("");
  const [m3u8Url, setM3u8Url] = useState<string | null>(null);
  const [loading, setLoading] = useState<boolean>(false);
  const [isModelLoaded, setIsModelLoaded] = useState(false);
  const [isDetecting, setIsDetecting] = useState(false);
  const videoRef = useRef<HTMLVideoElement | null>(null);
  const canvasRef = useRef<HTMLCanvasElement>(null);
  const detectionIntervalRef = useRef<ReturnType<typeof setInterval> | null>(
    null
  );
  const { toast } = useToast();

  useEffect(() => {
    const loadModels = async () => {
      try {
        await faceapi.nets.tinyFaceDetector.loadFromUri(MODEL_URL);
        await faceapi.nets.faceLandmark68Net.loadFromUri(MODEL_URL);
        await faceapi.nets.faceRecognitionNet.loadFromUri(MODEL_URL);
        setIsModelLoaded(true);
      } catch (error) {
        console.error("Error loading models:", error);
        toast({
          title: "Error",
          description: "Failed to load face detection models.",
          variant: "destructive",
        });
      }
    };
    loadModels();
  }, [toast]);

  useEffect(() => {
    if (m3u8Url && videoRef.current) {
      if (Hls.isSupported()) {
        const hls = new Hls();
        hls.loadSource(m3u8Url);
        hls.attachMedia(videoRef.current);
      } else if (
        videoRef.current.canPlayType("application/vnd.apple.mpegurl")
      ) {
        videoRef.current.src = m3u8Url;
      }
    }
  }, [m3u8Url]);

  const extractFaceWithPadding = (
    video: HTMLVideoElement,
    box: faceapi.Box
  ): HTMLCanvasElement => {
    const canvas = document.createElement("canvas");
    const context = canvas.getContext("2d");

    const x = Math.max(0, box.x - PADDING);
    const y = Math.max(0, box.y - PADDING);
    const width = Math.min(video.videoWidth - x, box.width + 2 * PADDING);
    const height = Math.min(video.videoHeight - y, box.height + 2 * PADDING);

    canvas.width = width;
    canvas.height = height;

    if (context) {
      context.drawImage(video, x, y, width, height, 0, 0, width, height);
    }

    return canvas;
  };

  const detectFace = async () => {
    if (!videoRef.current || !canvasRef.current || !videoRef.current.videoWidth)
      return;

    const video = videoRef.current;
    const canvas = canvasRef.current;
    const context = canvas.getContext("2d");

    if (!context) return;

    canvas.width = video.videoWidth;
    canvas.height = video.videoHeight;
    context.clearRect(0, 0, canvas.width, canvas.height);

    const detections = await faceapi
      .detectAllFaces(video, new faceapi.TinyFaceDetectorOptions())
      .withFaceLandmarks()
      .withFaceDescriptors();

    if (detections.length > 0) {
      const highConfidenceDetections = detections.filter(
        (detection) => detection.detection.score > 0.5
      );

      for (const detection of highConfidenceDetections) {
        const { box } = detection.detection;
        context.strokeStyle = "#00FF00";
        context.lineWidth = 2;
        context.strokeRect(box.x, box.y, box.width, box.height);
        context.fillStyle = "#00FF00";
        context.font = "16px Arial";
        context.fillText(
          `Confidence: ${Math.round(detection.detection.score * 100)}%`,
          box.x,
          box.y - 5
        );

        const faceCanvas = extractFaceWithPadding(video, box);
        faceCanvas.toBlob(
          (blob) => {
            if (blob) sendFaceDataToAPI(blob);
          },
          "image/jpeg",
          0.95
        );
      }
    }
  };

  const sendFaceDataToAPI = async (imageBlob: Blob) => {
    try {
      const formData = new FormData();
      formData.append("image", imageBlob, "face.jpg");

      const response = await fetch(
        `${process.env.NEXT_PUBLIC_BASE_URL}/search`,
        {
          method: "POST",
          body: formData,
        }
      );

      const data = await response.json();
      toast({ title: data?.name, description: data.message });
    } catch (error) {
      console.error("Error sending face data:", error);
      toast({
        title: "Error",
        description: "Failed to send face data.",
        variant: "destructive",
      });
    }
  };

  const startDetection = () => {
    if (!isModelLoaded || !videoRef.current) return;
    console.log("Starting detection...");
    setIsDetecting(true);
    detectionIntervalRef.current = setInterval(detectFace, 1000);
  };

  const stopDetection = () => {
    if (detectionIntervalRef.current) {
      clearInterval(detectionIntervalRef.current);
    }
    setIsDetecting(false);
    if (canvasRef.current) {
      const context = canvasRef.current.getContext("2d");
      if (context) {
        context.clearRect(
          0,
          0,
          canvasRef.current.width,
          canvasRef.current.height
        );
      }
    }
  };

  const handleSubmit = async (e: React.FormEvent) => {
    e.preventDefault();
    setLoading(true);
    stopDetection(); // Stop any ongoing detection

    try {
      const response = await fetch(API_URL, {
        method: "POST",
        headers: { "Content-Type": "application/json" },
        body: JSON.stringify({
          uri: rtspUrl,
          alias: cameraName,
        }),
      });

      if (!response.ok) {
        throw new Error("Failed to fetch stream URL");
      }

      const data = await response.json();
      setM3u8Url(`http://localhost:8081${data?.uri}`);
      console.log("isModelLoaded", isModelLoaded);
      console.log("m3u8Url", m3u8Url);
    } catch (error) {
      console.error("Error fetching stream:", error);
      toast({
        title: "Error",
        description: "Failed to load stream.",
        variant: "destructive",
      });
    } finally {
      setLoading(false);
    }
  };

  return (
    <div className="max-w-3xl mx-auto p-4">
      <h2 className="text-2xl font-bold mb-4">
        RTSP Stream with Face Detection
      </h2>
      <form onSubmit={handleSubmit} className="space-y-4 mb-6">
        <input
          type="text"
          value={rtspUrl}
          onChange={(e) => setRtspUrl(e.target.value)}
          placeholder="Enter RTSP URL"
          className="w-full p-2 border rounded"
          required
        />
        <input
          type="text"
          value={cameraName}
          onChange={(e) => setCameraName(e.target.value)}
          placeholder="Enter Camera Name"
          className="w-full p-2 border rounded"
          required
        />
        <Button type="submit" disabled={loading} className="w-full">
          {loading ? "Starting stream..." : "Start Stream"}
        </Button>
      </form>

      {m3u8Url && !loading && (
        <div className="relative">
          <video
            ref={videoRef}
            controls
            autoPlay
            className="w-full rounded-lg"
          />
          <canvas
            ref={canvasRef}
            className="absolute top-0 left-0 w-full h-full z-0 pointer-events-none"
          />

          <div className="mt-4 flex justify-center">
            <Button
              onClick={isDetecting ? stopDetection : startDetection}
              disabled={!isModelLoaded || !m3u8Url}
            >
              <Camera className="mr-2 h-4 w-4" />
              {isDetecting ? "Stop Detection" : "Start Detection"}
            </Button>
          </div>
        </div>
      )}
    </div>
  );
};

export default RtspStream;