'use client';

import { useState, useRef, useEffect } from 'react';
import { X, Camera, RotateCcw, Check } from 'lucide-react';
import clsx from 'clsx';

interface CameraModalProps {
    isOpen: boolean;
    onClose: () => void;
    onCapture: (file: File) => void;
}

export default function CameraModal({ isOpen, onClose, onCapture }: CameraModalProps) {
    const videoRef = useRef<HTMLVideoElement>(null);
    const canvasRef = useRef<HTMLCanvasElement>(null);
    const [stream, setStream] = useState<MediaStream | null>(null);
    const [capturedImage, setCapturedImage] = useState<string | null>(null);
    const [error, setError] = useState<string | null>(null);
    const [facingMode, setFacingMode] = useState<'user' | 'environment'>('environment');

    useEffect(() => {
        if (isOpen) {
            startCamera();
        } else {
            stopCamera();
            setCapturedImage(null);
        }

        return () => stopCamera();
    }, [isOpen, facingMode]);

    const startCamera = async () => {
        try {
            setError(null);
            const mediaStream = await navigator.mediaDevices.getUserMedia({
                video: {
                    facingMode: facingMode,
                    width: { ideal: 1280 },
                    height: { ideal: 720 }
                },
                audio: false
            });
            setStream(mediaStream);
            if (videoRef.current) {
                videoRef.current.srcObject = mediaStream;
            }
        } catch (err) {
            console.error('Camera error:', err);
            setError('Unable to access camera. Please check permissions.');
        }
    };

    const stopCamera = () => {
        if (stream) {
            stream.getTracks().forEach(track => track.stop());
            setStream(null);
        }
    };

    const switchCamera = () => {
        setFacingMode(prev => prev === 'user' ? 'environment' : 'user');
    };

    const capturePhoto = () => {
        if (videoRef.current && canvasRef.current) {
            const video = videoRef.current;
            const canvas = canvasRef.current;

            canvas.width = video.videoWidth;
            canvas.height = video.videoHeight;

            const ctx = canvas.getContext('2d');
            if (ctx) {
                ctx.drawImage(video, 0, 0);
                const imageDataUrl = canvas.toDataURL('image/jpeg', 0.9);
                setCapturedImage(imageDataUrl);
                stopCamera();
            }
        }
    };

    const retake = () => {
        setCapturedImage(null);
        startCamera();
    };

    const confirmCapture = () => {
        if (capturedImage && canvasRef.current) {
            canvasRef.current.toBlob((blob) => {
                if (blob) {
                    const file = new File([blob], `photo_${Date.now()}.jpg`, { type: 'image/jpeg' });
                    onCapture(file);
                    onClose();
                }
            }, 'image/jpeg', 0.9);
        }
    };

    if (!isOpen) return null;

    return (
        <div className="fixed inset-0 z-50 flex items-center justify-center p-4 bg-black/90 backdrop-blur-sm animate-fade-in-up">
            <div className="w-full max-w-xl bg-neutral-900 rounded-2xl shadow-2xl border border-neutral-800 overflow-hidden">

                {/* Header */}
                <div className="flex items-center justify-between p-4 border-b border-neutral-800">
                    <div className="flex items-center gap-2">
                        <Camera size={20} className="text-sky-500" />
                        <h2 className="text-lg font-semibold text-white">Take Photo</h2>
                    </div>
                    <button
                        onClick={onClose}
                        className="p-2 hover:bg-neutral-800 rounded-full"
                    >
                        <X size={20} className="text-gray-400" />
                    </button>
                </div>

                {/* Camera View */}
                <div className="relative aspect-[4/3] bg-black">
                    {error ? (
                        <div className="absolute inset-0 flex items-center justify-center text-center p-6">
                            <div>
                                <Camera size={48} className="mx-auto mb-4 text-gray-600" />
                                <p className="text-gray-400">{error}</p>
                            </div>
                        </div>
                    ) : capturedImage ? (
                        <img
                            src={capturedImage}
                            alt="Captured"
                            className="w-full h-full object-contain"
                        />
                    ) : (
                        <video
                            ref={videoRef}
                            autoPlay
                            playsInline
                            muted
                            className="w-full h-full object-cover"
                        />
                    )}

                    <canvas ref={canvasRef} className="hidden" />
                </div>

                {/* Controls */}
                <div className="p-4 flex items-center justify-center gap-4">
                    {!capturedImage ? (
                        <>
                            {/* Switch Camera */}
                            <button
                                onClick={switchCamera}
                                className="p-3 bg-neutral-800 hover:bg-neutral-700 rounded-full transition-colors"
                                title="Switch Camera"
                            >
                                <RotateCcw size={20} className="text-white" />
                            </button>

                            {/* Capture Button */}
                            <button
                                onClick={capturePhoto}
                                disabled={!stream}
                                className={clsx(
                                    "w-16 h-16 rounded-full border-4 border-white flex items-center justify-center transition-all",
                                    stream
                                        ? "bg-white hover:bg-gray-200 active:scale-95"
                                        : "bg-gray-600 border-gray-600 cursor-not-allowed"
                                )}
                            >
                                <div className="w-12 h-12 rounded-full bg-sky-500"></div>
                            </button>

                            {/* Placeholder for symmetry */}
                            <div className="w-11"></div>
                        </>
                    ) : (
                        <>
                            {/* Retake */}
                            <button
                                onClick={retake}
                                className="flex-1 py-3 bg-neutral-800 text-white rounded-xl font-medium hover:bg-neutral-700 flex items-center justify-center gap-2"
                            >
                                <RotateCcw size={18} />
                                Retake
                            </button>

                            {/* Confirm */}
                            <button
                                onClick={confirmCapture}
                                className="flex-1 py-3 bg-sky-500 text-white rounded-xl font-medium hover:bg-sky-600 flex items-center justify-center gap-2"
                            >
                                <Check size={18} />
                                Use Photo
                            </button>
                        </>
                    )}
                </div>
            </div>
        </div>
    );
}