// script.js - Versione con conferma email
let currentUser = null;

function checkSession() {
    const userJson = localStorage.getItem('currentUser');
    if (userJson) {
        currentUser = JSON.parse(userJson);
        
        // Verifica se l'utente è verificato
        if (!currentUser.verified) {
            alert('Il tuo account non è ancora stato verificato. Controlla la tua email.');
            localStorage.removeItem('currentUser');
            window.location.href = 'login.html';
            return;
        }
        
        const userInfo = document.getElementById('userInfo');
        if (userInfo) {
            userInfo.innerHTML = '<span>Ciao ' + (currentUser.fullName || currentUser.email) + '</span>';
        }
        if (document.getElementById('videoList')) {
            loadMyVideos();
        }
    } else {
        const currentPage = window.location.pathname;
        if (!currentPage.includes('login.html') && !currentPage.includes('register.html') && !currentPage.includes('verify.php')) {
            window.location.href = 'login.html';
        }
    }
}

// CAPTCHA dinamico
function generateCaptcha() {
    const num1 = Math.floor(Math.random() * 10) + 1;
    const num2 = Math.floor(Math.random() * 10) + 1;
    const ops = ['+', '-'];
    const op = ops[Math.floor(Math.random() * ops.length)];
    let answer;
    let question;
    if (op === '+') {
        answer = num1 + num2;
        question = num1 + ' + ' + num2;
    } else {
        const a = Math.max(num1, num2);
        const b = Math.min(num1, num2);
        answer = a - b;
        question = a + ' - ' + b;
    }
    const label = document.getElementById('captchaQuestion');
    if (label) {
        label.textContent = 'Quanto fa ' + question + '? (verifica anti-spam)';
    }
    const hidden = document.getElementById('captchaAnswer');
    if (hidden) {
        hidden.value = answer;
    }
}

// Registrazione
const registerForm = document.getElementById('registerForm');
if (registerForm) {
    generateCaptcha();
    registerForm.addEventListener('submit', async (e) => {
        e.preventDefault();
        
        const fullName = document.getElementById('fullName').value;
        const email = document.getElementById('email').value;
        const password = document.getElementById('password').value;
        const confirmPassword = document.getElementById('confirm_password').value;
        const waiverAccepted = document.getElementById('waiverAccepted').checked;
        const captcha = document.getElementById('captcha').value;
        const captchaAnswer = document.getElementById('captchaAnswer').value;

        // Validazioni
        if (password !== confirmPassword) {
            alert('Le password non coincidono');
            return;
        }

        if (password.length < 8) {
            alert('La password deve essere di almeno 8 caratteri');
            return;
        }

        if (!/[A-Z]/.test(password)) {
            alert('La password deve contenere almeno una lettera maiuscola');
            return;
        }

        if (!/[a-z]/.test(password)) {
            alert('La password deve contenere almeno una lettera minuscola');
            return;
        }

        if (!/[0-9]/.test(password)) {
            alert('La password deve contenere almeno un numero');
            return;
        }

        if (!waiverAccepted) {
            alert('Devi accettare la dichiarazione di rinuncia');
            return;
        }

        if (parseInt(captcha) !== parseInt(captchaAnswer)) {
            alert('Risposta errata alla domanda di sicurezza');
            generateCaptcha();
            return;
        }

        // Verifica se email esiste già
        let users = JSON.parse(localStorage.getItem('users') || '[]');
        if (users.find(u => u.email === email)) {
            alert('Email già registrata');
            return;
        }

        // Crea token di verifica
        const verificationToken = Math.random().toString(36).substring(2, 15) + Math.random().toString(36).substring(2, 15);

        const newUser = {
            id: Date.now(),
            email: email,
            password: btoa(password),
            fullName: fullName,
            verified: false,
            verificationToken: verificationToken,
            waiverSigned: true,
            waiverDate: new Date().toISOString(),
            createdAt: new Date().toISOString()
        };

        users.push(newUser);
        localStorage.setItem('users', JSON.stringify(users));
        
        // Salva waiver
        const waivers = JSON.parse(localStorage.getItem('waivers') || '[]');
        waivers.push({
            userId: newUser.id,
            email: email,
            fullName: fullName,
            signedAt: new Date().toISOString()
        });
        localStorage.setItem('waivers', JSON.stringify(waivers));

        // Invia email di verifica
        try {
            const response = await fetch('send_verification.php', {
                method: 'POST',
                headers: {'Content-Type': 'application/json'},
                body: JSON.stringify({
                    email: email,
                    name: fullName,
                    token: verificationToken,
                    userId: newUser.id,
                    password: newUser.password
                })
            });
            
            const result = await response.json();
            
            if (result.success) {
                alert('Registrazione completata! Ti abbiamo inviato una email di verifica. Clicca sul link per attivare il tuo account.');
                window.location.href = 'login.html';
            } else {
                alert('Registrazione completata ma non è stato possibile inviare l\'email di verifica. Contatta l\'amministratore.');
                console.error('Errore invio email:', result.error);
            }
        } catch (error) {
            console.error('Errore:', error);
            alert('Registrazione completata! Contatta l\'amministratore per attivare il tuo account.');
            window.location.href = 'login.html';
        }
    });
}

// Login
const loginForm = document.getElementById('loginForm');
if (loginForm) {
    loginForm.addEventListener('submit', async (e) => {
        e.preventDefault();
        const email = document.getElementById('email').value;
        const password = btoa(document.getElementById('password').value);
        
        let users = JSON.parse(localStorage.getItem('users') || '[]');
        let user = users.find(u => u.email === email && u.password === password);
        
        if (!user) {
            try {
                const resp = await fetch('api_get_user.php', {
                    method: 'POST',
                    headers: {'Content-Type': 'application/json'},
                    body: JSON.stringify({email: email, password: password})
                });
                const result = await resp.json();
                if (result.found && result.user) {
                    user = result.user;
                    users.push(user);
                    localStorage.setItem('users', JSON.stringify(users));
                }
            } catch (e) {
                console.error('Errore fetch utente:', e);
            }
        }
        
        if (user) {
            if (!user.verified) {
                alert('Account non verificato. Controlla la tua email per il link di attivazione.');
                return;
            }
            localStorage.setItem('currentUser', JSON.stringify(user));
            alert('Login effettuato!');
            window.location.href = 'index.html';
        } else {
            alert('Credenziali non valide');
        }
    });
}

// Upload video
const selectVideoBtn = document.getElementById('selectVideoBtn');
const videoInput = document.getElementById('videoInput');
const uploadBtn = document.getElementById('uploadBtn');
const fileName = document.getElementById('fileName');

if (selectVideoBtn) {
    selectVideoBtn.addEventListener('click', function() {
        videoInput.click();
    });
}

if (videoInput) {
    videoInput.addEventListener('change', function(e) {
        const file = e.target.files[0];
        if (file && file.type.startsWith('video/')) {
            fileName.textContent = 'Video selezionato: ' + file.name + ' (' + (file.size / 1024 / 1024).toFixed(2) + ' MB)';
            uploadBtn.disabled = false;
        } else {
            alert('Seleziona un file video valido');
            uploadBtn.disabled = true;
        }
    });
}

if (uploadBtn) {
    uploadBtn.addEventListener('click', async function() {
        const file = videoInput.files[0];
        const userJson = localStorage.getItem('currentUser');
        
        if (!userJson) {
            alert('Devi effettuare il login');
            window.location.href = 'login.html';
            return;
        }
        
        currentUser = JSON.parse(userJson);
        
        if (!currentUser.verified) {
            alert('Il tuo account non è verificato. Controlla la tua email.');
            return;
        }
        
        if (!file) {
            alert('Seleziona un video');
            return;
        }
        
        const formData = new FormData();
        formData.append('video', file);
        
        const userTokenData = {
            id: currentUser.id,
            email: currentUser.email,
            fullName: currentUser.fullName || currentUser.email.split('@')[0]
        };
        
        const token = btoa(JSON.stringify(userTokenData));
        formData.append('token', token);
        
        const progressBar = document.getElementById('progressBar');
        const progressFill = document.querySelector('.progress-fill');
        if (progressBar) progressBar.style.display = 'block';
        if (progressFill) progressFill.style.width = '0%';
        
        try {
            const xhr = new XMLHttpRequest();
            xhr.open('POST', 'upload.php', true);
            
            xhr.upload.onprogress = function(e) {
                if (e.lengthComputable && progressFill) {
                    const percent = (e.loaded / e.total) * 100;
                    progressFill.style.width = percent + '%';
                    progressFill.textContent = Math.round(percent) + '%';
                }
            };
            
            xhr.onload = function() {
                if (xhr.status === 200) {
                    try {
                        const response = JSON.parse(xhr.responseText);
                        if (response.success) {
                            alert('Video caricato con successo!');
                            videoInput.value = '';
                            fileName.textContent = '';
                            uploadBtn.disabled = true;
                            loadMyVideos();
                        } else {
                            alert('Errore: ' + (response.error || 'Sconosciuto'));
                        }
                    } catch(e) {
                        alert('Risposta server non valida');
                    }
                } else {
                    alert('Errore durante l\'upload (Status: ' + xhr.status + ')');
                }
                if (progressBar) progressBar.style.display = 'none';
                if (progressFill) progressFill.style.width = '0%';
            };
            
            xhr.onerror = function() {
                alert('Errore di connessione al server');
                if (progressBar) progressBar.style.display = 'none';
            };
            
            xhr.send(formData);
        } catch (error) {
            alert('Errore: ' + error.message);
            if (progressBar) progressBar.style.display = 'none';
        }
    });
}

// Carica video dell'utente
async function loadMyVideos() {
    const userJson = localStorage.getItem('currentUser');
    if (!userJson) return;
    
    const currentUserData = JSON.parse(userJson);
    const container = document.getElementById('videoList');
    if (!container) return;
    
    try {
        const response = await fetch('get_videos.php?userId=' + currentUserData.id);
        const videos = await response.json();
        
        if (videos.length === 0) {
            container.innerHTML = '<p style="text-align:center; color:#999;">Nessun video caricato</p>';
            return;
        }
        
        let html = '';
        for (let i = 0; i < videos.length; i++) {
            const video = videos[i];
            let displayName = video.savedFileName || video.originalFileName || 'Video';
            
            html += '<div class="video-item">';
            html += '<video width="100%" controls style="max-width: 400px; border-radius: 8px;">';
            html += '<source src="' + video.filePath + '" type="' + video.mimeType + '">';
            html += 'Il tuo browser non supporta il video';
            html += '</video>';
            html += '<p style="margin-top: 10px;">';
            html += '<strong>' + escapeHtml(displayName) + '</strong><br>';
            html += 'Data: ' + new Date(video.uploadDate).toLocaleString() + '<br>';
            html += 'Dimensione: ' + (video.fileSize / 1024 / 1024).toFixed(2) + ' MB';
            html += '</p></div>';
        }
        container.innerHTML = html;
    } catch (error) {
        console.error('Errore caricamento video:', error);
        container.innerHTML = '<p style="color:red;">Errore nel caricamento dei video</p>';
    }
}

function escapeHtml(text) {
    if (!text) return 'Video senza nome';
    return text.replace(/[&<>]/g, function(m) {
        if (m === '&') return '&amp;';
        if (m === '<') return '&lt;';
        if (m === '>') return '&gt;';
        return m;
    });
}

// Logout
const logoutBtn = document.getElementById('logoutBtn');
if (logoutBtn) {
    logoutBtn.addEventListener('click', function() {
        localStorage.removeItem('currentUser');
        window.location.href = 'login.html';
    });
}

checkSession();