// Main JavaScript file for Outline VPN

// Helper function to format bytes to human-readable format
function formatBytes(bytes, decimals = 2) {
    if (bytes === 0) return '0 Bytes';

    const k = 1024;
    const dm = decimals < 0 ? 0 : decimals;
    const sizes = ['Bytes', 'KB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB'];

    const i = Math.floor(Math.log(bytes) / Math.log(k));

    return parseFloat((bytes / Math.pow(k, i)).toFixed(dm)) + ' ' + sizes[i];
}

// Helper function to format duration
function formatDuration(milliseconds) {
    const seconds = Math.floor(milliseconds / 1000);
    const minutes = Math.floor(seconds / 60);
    const hours = Math.floor(minutes / 60);
    const days = Math.floor(hours / 24);

    if (days > 0) return `${days}d ${hours % 24}h`;
    if (hours > 0) return `${hours}h ${minutes % 60}m`;
    if (minutes > 0) return `${minutes}m ${seconds % 60}s`;
    return `${seconds}s`;
}

// Show toast notification
function showToast(message, type = 'info') {
    const toast = document.createElement('div');
    toast.className = `toast align-items-center text-white bg-${type} border-0`;
    toast.setAttribute('role', 'alert');
    toast.setAttribute('aria-live', 'assertive');
    toast.setAttribute('aria-atomic', 'true');

    toast.innerHTML = `
        <div class="d-flex">
            <div class="toast-body">${message}</div>
            <button type="button" class="btn-close btn-close-white me-2 m-auto" data-bs-dismiss="toast"></button>
        </div>
    `;

    const container = document.createElement('div');
    container.className = 'toast-container position-fixed bottom-0 end-0 p-3';
    container.appendChild(toast);
    document.body.appendChild(container);

    const bsToast = new bootstrap.Toast(toast);
    bsToast.show();

    toast.addEventListener('hidden.bs.toast', () => {
        container.remove();
    });
}

// Copy text to clipboard
function copyToClipboard(text, successMessage = 'Copied to clipboard!') {
    navigator.clipboard.writeText(text)
        .then(() => showToast(successMessage, 'success'))
        .catch(() => showToast('Failed to copy text', 'danger'));
}

// Download file helper
function downloadFile(content, filename, type = 'application/json') {
    const blob = new Blob([content], { type });
    const url = window.URL.createObjectURL(blob);
    const a = document.createElement('a');
    a.href = url;
    a.download = filename;
    document.body.appendChild(a);
    a.click();
    window.URL.revokeObjectURL(url);
    document.body.removeChild(a);
}

// Form validation
function validateForm(formElement) {
    const requiredFields = formElement.querySelectorAll('[required]');
    let isValid = true;

    requiredFields.forEach(field => {
        if (!field.value.trim()) {
            isValid = false;
            field.classList.add('is-invalid');
        } else {
            field.classList.remove('is-invalid');
        }
    });

    return isValid;
}

// Password strength checker
function checkPasswordStrength(password) {
    let strength = 0;
    const messages = [];

    if (password.length >= 8) strength++;
    else messages.push('Password should be at least 8 characters long');

    if (password.match(/[a-z]/)) strength++;
    if (password.match(/[A-Z]/)) strength++;
    else messages.push('Include at least one uppercase letter');

    if (password.match(/[0-9]/)) strength++;
    else messages.push('Include at least one number');

    if (password.match(/[^a-zA-Z0-9]/)) strength++;
    else messages.push('Include at least one special character');

    return {
        score: strength,
        messages: messages,
        label: ['Very Weak', 'Weak', 'Fair', 'Good', 'Strong'][strength - 1] || 'Very Weak'
    };
}

// Initialize password strength meter if it exists
document.addEventListener('DOMContentLoaded', () => {
    const passwordInput = document.querySelector('input[type="password"]');
    if (passwordInput) {
        const feedbackDiv = document.createElement('div');
        feedbackDiv.className = 'password-strength-meter mt-2';
        passwordInput.parentNode.appendChild(feedbackDiv);

        passwordInput.addEventListener('input', (e) => {
            const strength = checkPasswordStrength(e.target.value);
            const color = ['danger', 'warning', 'info', 'primary', 'success'][strength.score - 1] || 'danger';
            
            feedbackDiv.innerHTML = `
                <div class="progress" style="height: 5px;">
                    <div class="progress-bar bg-${color}" 
                         style="width: ${(strength.score / 5) * 100}%">
                    </div>
                </div>
                <small class="text-${color} mt-1 d-block">${strength.label}</small>
            `;
        });
    }
});

// Initialize tooltips
document.addEventListener('DOMContentLoaded', () => {
    const tooltipTriggerList = [].slice.call(document.querySelectorAll('[data-bs-toggle="tooltip"]'));
    tooltipTriggerList.map(function (tooltipTriggerEl) {
        return new bootstrap.Tooltip(tooltipTriggerEl);
    });
});