import { useState, useEffect } from 'react';
import { Type, Sun, MonitorOff, RotateCcw, Accessibility, Eye, Volume2 } from 'lucide-react';
import { Button } from "@/components/ui/button";
import {
  DropdownMenu,
  DropdownMenuContent,
  DropdownMenuLabel,
  DropdownMenuSeparator,
  DropdownMenuTrigger,
} from "@/components/ui/dropdown-menu";
import { useTranslation } from 'react-i18next';

const AccessibilityMenu = () => {
    const { i18n } = useTranslation();
    const [fontSize, setFontSize] = useState(100);
    const [highContrast, setHighContrast] = useState(false);
    const [grayscale, setGrayscale] = useState(false);
    const [readableFont, setReadableFont] = useState(false);
    const [screenReader, setScreenReader] = useState(false);

    // Apply changes to the document
    useEffect(() => {
        const root = document.documentElement;
        
        // Font Size
        root.style.fontSize = `${fontSize}%`;
        
        // High Contrast
        if (highContrast) {
            root.classList.add('high-contrast');
            document.body.style.backgroundColor = '#000';
            document.body.style.color = '#fff';
            // Force specific elements to contrast
            const cards = document.querySelectorAll('.bg-white');
            cards.forEach((el: any) => {
                el.style.backgroundColor = '#1a1a1a';
                el.style.color = '#fff';
                el.style.borderColor = '#333';
            });
        } else {
            root.classList.remove('high-contrast');
            document.body.style.backgroundColor = '';
            document.body.style.color = '';
             const cards = document.querySelectorAll('.bg-white');
            cards.forEach((el: any) => {
                el.style.backgroundColor = '';
                el.style.color = '';
                 el.style.borderColor = '';
            });
        }

        // Grayscale
        if (grayscale) {
            root.style.filter = 'grayscale(100%)';
        } else {
            root.style.filter = '';
        }

        // Readable Font
        if (readableFont) {
            document.body.classList.add('readable-font');
            document.body.style.fontFamily = 'Arial, Helvetica, sans-serif';
            document.body.style.lineHeight = '1.8';
            document.body.style.letterSpacing = '0.05em';
        } else {
            document.body.classList.remove('readable-font');
            document.body.style.fontFamily = '';
            document.body.style.lineHeight = '';
            document.body.style.letterSpacing = '';
        }

    }, [fontSize, highContrast, grayscale, readableFont]);

    // Simple Screen Reader Simulation (reads hovered text)
    useEffect(() => {
        if (!screenReader) {
            window.speechSynthesis.cancel();
            return;
        }

        const handleMouseOver = (e: MouseEvent) => {
            const target = e.target as HTMLElement;
            if (target && (target.innerText || target.getAttribute('aria-label'))) {
                window.speechSynthesis.cancel();
                const text = target.getAttribute('aria-label') || target.innerText;
                if (text && text.trim().length > 0) {
                     // Filter out long text blocks to avoid annoyance
                    if (text.length < 200) {
                        const utterance = new SpeechSynthesisUtterance(text);
                        // Try to match language
                        utterance.lang = i18n.language === 'hi' ? 'hi-IN' : 'en-US';
                        window.speechSynthesis.speak(utterance);
                    }
                }
            }
        };

        document.addEventListener('mouseover', handleMouseOver);
        return () => {
            document.removeEventListener('mouseover', handleMouseOver);
            window.speechSynthesis.cancel();
        };
    }, [screenReader, i18n.language]);

    const resetSettings = () => {
        setFontSize(100);
        setHighContrast(false);
        setGrayscale(false);
        setReadableFont(false);
        setScreenReader(false);
    };

    return (
        <div className="fixed bottom-6 right-6 z-[100]">
            <DropdownMenu>
                <DropdownMenuTrigger asChild>
                    <Button 
                        size="icon" 
                        className="h-14 w-14 rounded-full shadow-2xl bg-blue-600 hover:bg-blue-700 text-white border-4 border-white"
                        aria-label="Accessibility Options"
                    >
                        <Accessibility className="h-8 w-8" />
                    </Button>
                </DropdownMenuTrigger>
                <DropdownMenuContent align="end" className="w-72 p-4 bg-white/95 backdrop-blur-sm shadow-xl border-blue-100">
                    <DropdownMenuLabel className="flex items-center justify-between text-lg">
                        <span>Accessibility Tools</span>
                        <Button variant="ghost" size="sm" onClick={resetSettings} className="h-8 px-2 text-xs text-red-500 hover:text-red-700 hover:bg-red-50">
                            <RotateCcw className="h-3 w-3 mr-1" /> Reset
                        </Button>
                    </DropdownMenuLabel>
                    <DropdownMenuSeparator />
                    
                    {/* Font Size Control */}
                    <div className="py-3">
                        <div className="text-sm font-medium mb-3 flex items-center text-gray-700">
                            <Type className="h-4 w-4 mr-2" /> Text Size ({fontSize}%)
                        </div>
                        <div className="flex gap-2">
                            <Button 
                                variant="outline" 
                                size="sm" 
                                className="flex-1 border-gray-200 hover:bg-blue-50 hover:border-blue-200 hover:text-blue-600"
                                onClick={() => setFontSize(Math.max(80, fontSize - 10))}
                                disabled={fontSize <= 80}
                            >
                                A-
                            </Button>
                            <Button 
                                variant="outline" 
                                size="sm" 
                                className="flex-1 border-gray-200 hover:bg-blue-50 hover:border-blue-200 hover:text-blue-600"
                                onClick={() => setFontSize(Math.min(150, fontSize + 10))}
                                disabled={fontSize >= 150}
                            >
                                A+
                            </Button>
                        </div>
                    </div>

                    <DropdownMenuSeparator className="my-1"/>

                    {/* Display Options */}
                    <div className="space-y-2 py-2">
                        <Button 
                            variant={highContrast ? "default" : "ghost"} 
                            className={`w-full justify-start ${highContrast ? 'bg-black text-white hover:bg-gray-800' : 'hover:bg-gray-100 text-gray-700'}`}
                            onClick={() => setHighContrast(!highContrast)}
                        >
                            <Sun className="h-4 w-4 mr-3" />
                            {highContrast ? 'Disable High Contrast' : 'High Contrast Mode'}
                        </Button>

                        <Button 
                            variant={grayscale ? "default" : "ghost"} 
                            className={`w-full justify-start ${grayscale ? 'bg-gray-600 hover:bg-gray-700' : 'hover:bg-gray-100 text-gray-700'}`}
                            onClick={() => setGrayscale(!grayscale)}
                        >
                            <MonitorOff className="h-4 w-4 mr-3" />
                            {grayscale ? 'Disable Grayscale' : 'Grayscale Mode'}
                        </Button>

                         <Button 
                            variant={readableFont ? "default" : "ghost"} 
                            className={`w-full justify-start ${readableFont ? 'bg-blue-600 hover:bg-blue-700' : 'hover:bg-gray-100 text-gray-700'}`}
                            onClick={() => setReadableFont(!readableFont)}
                        >
                            <Eye className="h-4 w-4 mr-3" />
                            {readableFont ? 'Disable Readable Font' : 'Dyslexia Friendly Font'}
                        </Button>

                         <Button 
                            variant={screenReader ? "default" : "ghost"} 
                            className={`w-full justify-start ${screenReader ? 'bg-green-600 hover:bg-green-700' : 'hover:bg-gray-100 text-gray-700'}`}
                            onClick={() => setScreenReader(!screenReader)}
                        >
                            <Volume2 className="h-4 w-4 mr-3" />
                            {screenReader ? 'Turn Off Screen Reader' : 'Screen Reader (Hover)'}
                        </Button>
                    </div>
                </DropdownMenuContent>
            </DropdownMenu>
        </div>
    );
};

export default AccessibilityMenu;