'use client';

import React, { useState, useRef, useCallback } from 'react';
import { motion, AnimatePresence } from 'framer-motion';
import { X, Camera, Trash2, Send, Loader2, Check, AlertCircle, Zap } from 'lucide-react';
import { useBulkScanner } from '@/hooks/useBulkScanner';

interface BulkScanSheetProps {
    isOpen: boolean;
    onClose: () => void;
    sessionId: string;
    sessionName: string;
    onSuccess?: (bottleIds: string[]) => void;
}

export default function BulkScanSheet({
    isOpen,
    onClose,
    sessionId,
    sessionName,
    onSuccess
}: BulkScanSheetProps) {
    const { queue, addToQueue, removeFromQueue, clearQueue, submitToSession, isSubmitting, progress } = useBulkScanner();
    const videoRef = useRef<HTMLVideoElement>(null);
    const canvasRef = useRef<HTMLCanvasElement>(null);
    const streamRef = useRef<MediaStream | null>(null);
    const [isCameraReady, setIsCameraReady] = useState(false);
    const [cameraError, setCameraError] = useState<string | null>(null);
    const [submitError, setSubmitError] = useState<string | null>(null);

    // Start camera when sheet opens
    React.useEffect(() => {
        if (isOpen) {
            startCamera();
        } else {
            stopCamera();
        }
        return () => stopCamera();
    }, [isOpen]);

    const startCamera = async () => {
        try {
            setCameraError(null);
            const stream = await navigator.mediaDevices.getUserMedia({
                video: {
                    facingMode: 'environment',
                    width: { ideal: 1920 },
                    height: { ideal: 1080 }
                }
            });

            if (videoRef.current) {
                videoRef.current.srcObject = stream;
                streamRef.current = stream;
                setIsCameraReady(true);
            }
        } catch (error) {
            console.error('Camera error:', error);
            setCameraError('Kamera konnte nicht gestartet werden');
        }
    };

    const stopCamera = () => {
        if (streamRef.current) {
            streamRef.current.getTracks().forEach(track => track.stop());
            streamRef.current = null;
        }
        setIsCameraReady(false);
    };

    const captureImage = useCallback(() => {
        if (!videoRef.current || !canvasRef.current) return;

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

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

        const ctx = canvas.getContext('2d');
        if (!ctx) return;

        ctx.drawImage(video, 0, 0);

        canvas.toBlob((blob) => {
            if (blob) {
                addToQueue(blob, `Flasche #${queue.length + 1}`);
            }
        }, 'image/webp', 0.85);
    }, [addToQueue, queue.length]);

    const handleSubmit = async () => {
        setSubmitError(null);
        const result = await submitToSession(sessionId);

        if (result.success && result.bottleIds) {
            onSuccess?.(result.bottleIds);
            setTimeout(() => {
                onClose();
            }, 500);
        } else {
            setSubmitError(result.error || 'Fehler beim Hochladen');
        }
    };

    const handleClose = () => {
        if (queue.length > 0 && !isSubmitting) {
            if (!confirm('Warteschlange verwerfen?')) return;
        }
        clearQueue();
        onClose();
    };

    if (!isOpen) return null;

    return (
        <AnimatePresence>
            <motion.div
                initial={{ opacity: 0 }}
                animate={{ opacity: 1 }}
                exit={{ opacity: 0 }}
                className="fixed inset-0 bg-black z-50 flex flex-col"
            >
                {/* Header */}
                <div className="flex items-center justify-between p-4 bg-zinc-900/80 backdrop-blur-xs border-b border-zinc-800">
                    <div className="flex items-center gap-3">
                        <div className="w-10 h-10 rounded-xl bg-orange-600/20 flex items-center justify-center">
                            <Zap size={20} className="text-orange-500" />
                        </div>
                        <div>
                            <h2 className="text-sm font-bold text-white uppercase tracking-widest">Bulk Scan</h2>
                            <p className="text-xs text-zinc-500">{sessionName}</p>
                        </div>
                    </div>
                    <button
                        onClick={handleClose}
                        disabled={isSubmitting}
                        className="p-2 hover:bg-zinc-800 rounded-xl transition-colors text-zinc-500 hover:text-white disabled:opacity-50"
                    >
                        <X size={24} />
                    </button>
                </div>

                {/* Camera View */}
                <div className="flex-1 relative overflow-hidden">
                    {cameraError ? (
                        <div className="absolute inset-0 flex items-center justify-center bg-zinc-900">
                            <div className="text-center text-zinc-500">
                                <AlertCircle size={48} className="mx-auto mb-4 text-red-500" />
                                <p>{cameraError}</p>
                            </div>
                        </div>
                    ) : (
                        <>
                            <video
                                ref={videoRef}
                                autoPlay
                                playsInline
                                muted
                                className="absolute inset-0 w-full h-full object-cover"
                            />
                            {!isCameraReady && (
                                <div className="absolute inset-0 flex items-center justify-center bg-zinc-900">
                                    <Loader2 size={32} className="animate-spin text-orange-500" />
                                </div>
                            )}
                        </>
                    )}

                    {/* Hidden canvas for capture */}
                    <canvas ref={canvasRef} className="hidden" />

                    {/* Capture Button */}
                    {isCameraReady && (
                        <div className="absolute bottom-6 left-1/2 -translate-x-1/2">
                            <button
                                onClick={captureImage}
                                disabled={isSubmitting}
                                className="w-20 h-20 bg-white rounded-full flex items-center justify-center shadow-2xl active:scale-95 transition-transform disabled:opacity-50 ring-4 ring-white/20"
                            >
                                <Camera size={32} className="text-zinc-900" />
                            </button>
                        </div>
                    )}

                    {/* Queue Counter Badge */}
                    {queue.length > 0 && (
                        <motion.div
                            initial={{ scale: 0 }}
                            animate={{ scale: 1 }}
                            className="absolute top-4 right-4 bg-orange-600 text-white text-lg font-black px-4 py-2 rounded-full shadow-lg"
                        >
                            {queue.length}
                        </motion.div>
                    )}
                </div>

                {/* Queue Strip */}
                {queue.length > 0 && (
                    <motion.div
                        initial={{ y: 100 }}
                        animate={{ y: 0 }}
                        className="bg-zinc-900 border-t border-zinc-800 p-4"
                    >
                        {/* Thumbnails */}
                        <div className="flex gap-2 overflow-x-auto pb-3 scrollbar-none">
                            {queue.map((item, i) => (
                                <motion.div
                                    key={item.tempId}
                                    initial={{ scale: 0, opacity: 0 }}
                                    animate={{ scale: 1, opacity: 1 }}
                                    className="relative shrink-0"
                                >
                                    <div className={`w-16 h-20 rounded-xl overflow-hidden ring-2 ${item.status === 'done' ? 'ring-green-500' :
                                            item.status === 'error' ? 'ring-red-500' :
                                                item.status === 'uploading' ? 'ring-orange-500 animate-pulse' :
                                                    'ring-zinc-700'
                                        }`}>
                                        <img
                                            src={item.previewUrl}
                                            alt={`Bottle ${i + 1}`}
                                            className="w-full h-full object-cover"
                                        />
                                        {item.status === 'uploading' && (
                                            <div className="absolute inset-0 bg-black/50 flex items-center justify-center">
                                                <Loader2 size={16} className="animate-spin text-orange-500" />
                                            </div>
                                        )}
                                        {item.status === 'done' && (
                                            <div className="absolute inset-0 bg-green-500/30 flex items-center justify-center">
                                                <Check size={20} className="text-white" />
                                            </div>
                                        )}
                                    </div>
                                    {!isSubmitting && item.status === 'queued' && (
                                        <button
                                            onClick={() => removeFromQueue(item.tempId)}
                                            className="absolute -top-1 -right-1 w-5 h-5 bg-red-500 rounded-full flex items-center justify-center shadow-lg"
                                        >
                                            <X size={12} className="text-white" />
                                        </button>
                                    )}
                                    <span className="absolute bottom-0.5 left-0.5 text-[9px] font-bold text-white bg-black/60 px-1 rounded-sm">
                                        #{i + 1}
                                    </span>
                                </motion.div>
                            ))}
                        </div>

                        {/* Error Message */}
                        {submitError && (
                            <div className="mb-3 text-sm text-red-500 text-center bg-red-500/10 py-2 rounded-xl">
                                {submitError}
                            </div>
                        )}

                        {/* Submit Button */}
                        <button
                            onClick={handleSubmit}
                            disabled={isSubmitting || queue.length === 0}
                            className="w-full py-4 bg-orange-600 hover:bg-orange-700 disabled:bg-zinc-800 disabled:text-zinc-600 text-white font-bold rounded-2xl transition-all flex items-center justify-center gap-2"
                        >
                            {isSubmitting ? (
                                <>
                                    <Loader2 size={18} className="animate-spin" />
                                    Hochladen {progress.current}/{progress.total}...
                                </>
                            ) : (
                                <>
                                    <Send size={18} />
                                    {queue.length} Flasche{queue.length !== 1 ? 'n' : ''} zur Session hinzufügen
                                </>
                            )}
                        </button>
                    </motion.div>
                )}
            </motion.div>
        </AnimatePresence>
    );
}