'use client';

import { useState, useEffect } from 'react';

export default function InstallPrompt() {
    const [isIOS, setIsIOS] = useState(false);
    const [isStandalone, setIsStandalone] = useState(false);
    const [showPrompt, setShowPrompt] = useState(false);
    const [deferredPrompt, setDeferredPrompt] = useState<any>(null);

    useEffect(() => {
        // Check if already in standalone mode
        const isStandaloneMode = window.matchMedia('(display-mode: standalone)').matches || (window.navigator as any).standalone;
        setIsStandalone(isStandaloneMode);

        // Check if iOS
        const userAgent = window.navigator.userAgent.toLowerCase();
        const isIosDevice = /iphone|ipad|ipod/.test(userAgent);
        setIsIOS(isIosDevice);

        // Check if already dismissed
        const isDismissed = localStorage.getItem('installPromptDismissed');

        if (!isStandaloneMode && !isDismissed) {
            if (isIosDevice) {
                // Show prompt for iOS immediately if not dismissed
                setShowPrompt(true);
            } else {
                // For Android/Desktop, wait for beforeinstallprompt
                const handleBeforeInstallPrompt = (e: Event) => {
                    e.preventDefault();
                    setDeferredPrompt(e);
                    setShowPrompt(true);
                };

                window.addEventListener('beforeinstallprompt', handleBeforeInstallPrompt);

                return () => {
                    window.removeEventListener('beforeinstallprompt', handleBeforeInstallPrompt);
                };
            }
        }
    }, []);

    const handleInstallClick = async () => {
        if (deferredPrompt) {
            deferredPrompt.prompt();
            const { outcome } = await deferredPrompt.userChoice;
            if (outcome === 'accepted') {
                setDeferredPrompt(null);
                setShowPrompt(false);
            }
        }
    };

    const handleDismiss = () => {
        setShowPrompt(false);
        localStorage.setItem('installPromptDismissed', 'true');
    };

    if (!showPrompt) return null;

    return (
        <div style={{
            position: 'fixed',
            bottom: '20px',
            left: '20px',
            right: '20px',
            background: 'rgba(255, 255, 255, 0.95)',
            backdropFilter: 'blur(10px)',
            padding: '1rem',
            borderRadius: '1rem',
            boxShadow: '0 10px 25px rgba(0,0,0,0.2)',
            zIndex: 1000,
            display: 'flex',
            flexDirection: 'column',
            gap: '0.5rem',
            border: '1px solid rgba(0,0,0,0.1)',
            animation: 'slideUp 0.5s ease-out'
        }}>
            <div style={{ display: 'flex', justifyContent: 'space-between', alignItems: 'start' }}>
                <div>
                    <h3 style={{ fontWeight: 'bold', fontSize: '1rem', marginBottom: '0.25rem' }}>Install Hördle App</h3>
                    <p style={{ fontSize: '0.875rem', color: '#666' }}>
                        Install the app for a better experience and quick access!
                    </p>
                </div>
                <button
                    onClick={handleDismiss}
                    style={{
                        background: 'none',
                        border: 'none',
                        fontSize: '1.25rem',
                        cursor: 'pointer',
                        padding: '0.25rem',
                        color: '#999'
                    }}
                >
                    ×
                </button>
            </div>

            {isIOS ? (
                <div style={{ fontSize: '0.875rem', background: '#f3f4f6', padding: '0.75rem', borderRadius: '0.5rem', marginTop: '0.5rem' }}>
                    Tap <span style={{ fontSize: '1.2rem' }}>share</span> then "Add to Home Screen" <span style={{ fontSize: '1.2rem' }}>+</span>
                </div>
            ) : (
                <button
                    onClick={handleInstallClick}
                    style={{
                        background: '#4f46e5',
                        color: 'white',
                        border: 'none',
                        padding: '0.75rem',
                        borderRadius: '0.5rem',
                        fontWeight: 'bold',
                        cursor: 'pointer',
                        marginTop: '0.5rem'
                    }}
                >
                    Install App
                </button>
            )}
            <style jsx>{`
                @keyframes slideUp {
                    from { transform: translateY(100%); opacity: 0; }
                    to { transform: translateY(0); opacity: 1; }
                }
            `}</style>
        </div>
    );
}