import { useState, useEffect, useRef } from 'react'

interface LiveCameraViewProps {
    cameraName: string
}

export function LiveCameraView({ cameraName }: LiveCameraViewProps) {
    const [isStreaming, setIsStreaming] = useState(false)
    const [error, setError] = useState<string | null>(null)
    const [loading, setLoading] = useState(true)
    const imgRef = useRef<HTMLImageElement>(null)

    const API_BASE = import.meta.env.VITE_VISION_API_URL || 'http://localhost:8000'

    useEffect(() => {
        startStreaming()
        return () => stopStreaming()
    }, [cameraName])

    const startStreaming = async () => {
        try {
            setLoading(true)
            setError(null)

            // Start the stream
            const response = await fetch(`${API_BASE}/cameras/${cameraName}/start-stream`, {
                method: 'POST'
            })

            if (response.ok) {
                setIsStreaming(true)
                // Set the stream source with timestamp to prevent caching
                if (imgRef.current) {
                    imgRef.current.src = `${API_BASE}/cameras/${cameraName}/stream?t=${Date.now()}`
                }
            } else {
                throw new Error(`Failed to start stream: ${response.statusText}`)
            }
        } catch (err) {
            const errorMessage = err instanceof Error ? err.message : 'Failed to start stream'
            setError(errorMessage)
        } finally {
            setLoading(false)
        }
    }

    const stopStreaming = async () => {
        try {
            if (isStreaming) {
                await fetch(`${API_BASE}/cameras/${cameraName}/stop-stream`, {
                    method: 'POST'
                })
                setIsStreaming(false)
            }
        } catch (err) {
            console.error('Error stopping stream:', err)
        }
    }

    const handleImageError = () => {
        setError('Failed to load camera stream')
    }

    const handleImageLoad = () => {
        setError(null)
    }

    if (loading) {
        return (
            <div className="min-h-screen flex items-center justify-center bg-gray-900">
                <div className="text-center text-white">
                    <div className="animate-spin rounded-full h-12 w-12 border-b-2 border-white mx-auto"></div>
                    <p className="mt-4">Starting camera stream...</p>
                </div>
            </div>
        )
    }

    if (error) {
        return (
            <div className="min-h-screen flex items-center justify-center bg-gray-900">
                <div className="text-center text-white">
                    <div className="bg-red-600 rounded-full w-16 h-16 flex items-center justify-center mx-auto mb-4">
                        <svg className="w-8 h-8" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                            <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M6 18L18 6M6 6l12 12" />
                        </svg>
                    </div>
                    <h2 className="text-xl font-semibold mb-2">Stream Error</h2>
                    <p className="text-gray-300 mb-4">{error}</p>
                    <button
                        onClick={startStreaming}
                        className="bg-blue-600 hover:bg-blue-700 text-white px-6 py-2 rounded-md"
                    >
                        Retry
                    </button>
                </div>
            </div>
        )
    }

    return (
        <div className="min-h-screen bg-gray-900 flex items-center justify-center">
            <div className="relative">
                {/* Camera Label */}
                <div className="absolute top-4 left-4 z-10">
                    <div className="bg-black bg-opacity-75 text-white px-3 py-1 rounded-md text-sm font-medium">
                        {cameraName} - Live View
                    </div>
                </div>

                {/* Live Stream */}
                <img
                    ref={imgRef}
                    alt={`Live stream from ${cameraName}`}
                    className="max-w-full max-h-screen object-contain"
                    onError={handleImageError}
                    onLoad={handleImageLoad}
                />

                {/* Status Indicator */}
                <div className="absolute bottom-4 right-4 z-10">
                    <div className="flex items-center space-x-2 bg-black bg-opacity-75 text-white px-3 py-1 rounded-md">
                        <div className="w-2 h-2 bg-green-500 rounded-full animate-pulse"></div>
                        <span className="text-sm">LIVE</span>
                    </div>
                </div>
            </div>
        </div>
    )
}