"use client";
import React, { useRef, useState, useEffect } from "react";
import "./Register.css"; // Import CSS for styling
import { toast } from "@/hooks/use-toast";
import { Button } from "../ui/button";

const Register: React.FC = () => {
  const videoRef = useRef<HTMLVideoElement>(null);
  const canvasRef = useRef<HTMLCanvasElement>(null);
  const [name, setName] = useState<string>("");
  const [error, setError] = useState<string>(""); // State for error message
  const [selectedFile, setSelectedFile] = useState<File | null>(null); // State for uploaded image

  // Automatically open the camera when the component mounts
  useEffect(() => {
    const openCamera = async () => {
      try {
        const stream = await navigator.mediaDevices.getUserMedia({
          video: true,
        });
        if (videoRef.current) {
          videoRef.current.srcObject = stream;
        }
      } catch (err) {
        console.error("Error accessing the camera", err);
      }
    };

    openCamera();
  }, []);

  // Capture image from video stream
  const captureImage = () => {
    if (!name.trim()) {
      setError("Name is required"); // Set error message if name is empty
      return;
    }

    const video = videoRef.current;
    const canvas = canvasRef.current;

    if (video && canvas) {
      const context = canvas.getContext("2d");
      if (context) {
        // Draw the current frame from the video on the canvas
        context.drawImage(video, 0, 0, canvas.width, canvas.height);
        canvas.toBlob((blob) => {
          if (blob) {
            const file = new File([blob], "captured-image.png", {
              type: "image/png",
            });
            callApi(name, file);
          }
        }, "image/png");
      }
    }
  };

  // Handle file upload
  const handleFileUpload = (event: React.ChangeEvent<HTMLInputElement>) => {
    const file = event.target.files?.[0] || null;
    setSelectedFile(file);
  };

  // Submit uploaded file
  const submitUploadedFile = () => {
    if (!name.trim()) {
      setError("Name is required");
      return;
    }

    if (!selectedFile) {
      setError("Please upload an image file.");
      return;
    }

    callApi(name, selectedFile);
  };

  // Call API with name and image file
  const callApi = async (name: string, file: File) => {
    const formData = new FormData();
    formData.append("name", name);
    formData.append("image", file);

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

      // End measuring time
      const endTime = performance.now();
      const totalTime = (endTime - startTime) / 1000; // Convert milliseconds to seconds

      if (response.ok) {
        const data = await response.json();
        console.log("API call successful", totalTime);
        toast({
          title: data.message,
          description: `Name: ${data?.name} `,
        });
        setError("");
      } else {
        console.error("API call failed");
        setError("Failed to register. Please try again.");
      }
    } catch (error) {
      console.error("Error calling API", error);
      setError("An error occurred. Please try again.");
    }
  };

  return (
    <div className="container">
      <h1 className="title">Face Capture & Upload Form</h1>
      <form className="form">
        <div className="form-group">
          <label htmlFor="name" className="label">
            Name:
          </label>
          <input
            id="name"
            type="text"
            value={name}
            onChange={(e) => {
              setName(e.target.value);
              setError(""); // Clearing error message when user starts typing
            }}
            className="input"
            placeholder="Enter your name"
            required
          />
          {error && !name.trim() && (
            <p className="error-message">{error}</p> // Displaying error message if name is empty
          )}
        </div>

        <div className="mb-5">
          <video
            ref={videoRef}
            autoPlay
            playsInline
            className="w-full max-w-[500px] rounded-lg shadow-md scale-x-[-1]"
          />
          <Button
            type="button"
            onClick={captureImage}
            className="capture-button"
          >
            Capture Image
          </Button>
        </div>
        <div>Or</div>

        <div className="file-upload-container">
          <label htmlFor="file-upload" className="label">
            Upload Image:
          </label>
          <input
            id="file-upload"
            type="file"
            accept="image/*"
            onChange={handleFileUpload}
            className="file-input"
          />
          <button
            type="button"
            onClick={submitUploadedFile}
            // className="upload-button"
            className="capture-button"
          >
            Submit Uploaded Image
          </button>
        </div>

        <canvas
          ref={canvasRef}
          style={{ display: "none" }}
          width="640"
          height="480"
        />

        {error && <p className="error-message">{error}</p>}
      </form>
    </div>
  );
};

export default Register;