let progressInterval = null;

function startProgressPolling() {
    if (progressInterval) {
        clearInterval(progressInterval);
    }
    
    progressInterval = setInterval(async () => {
        try {
            const response = await fetch('/api/progress');
            const data = await response.json();
            
            if (data.active) {
                updateProgressUI(data.message, data.progress, data.total);
            } else {
                stopProgressPolling();
            }
        } catch (error) {
            console.error('Progress polling error:', error);
        }
    }, 500);
}

function stopProgressPolling() {
    if (progressInterval) {
        clearInterval(progressInterval);
        progressInterval = null;
    }
}

function updateProgressUI(message, progress, total) {
    const progressSection = document.getElementById('progressSection');
    const progressBar = progressSection.querySelector('.progress-bar');
    const progressMessage = document.getElementById('progressMessage');
    const progressPercentage = document.getElementById('progressPercentage');
    
    const percentage = total > 0 ? Math.round((progress / total) * 100) : 0;
    progressBar.style.width = percentage + '%';
    
    if (progressPercentage) {
        progressPercentage.textContent = percentage + '%';
    }
    
    progressBar.setAttribute('aria-valuenow', percentage);
    
    if (progressMessage) {
        progressMessage.textContent = message;
    }
}

function showProgress() {
    const progressSection = document.getElementById('progressSection');
    const progressBar = progressSection.querySelector('.progress-bar');
    const progressMessage = document.getElementById('progressMessage');
    const progressPercentage = document.getElementById('progressPercentage');
    
    progressBar.style.width = '0%';
    if (progressPercentage) {
        progressPercentage.textContent = '0%';
    }
    if (progressMessage) {
        progressMessage.textContent = 'Initializing...';
    }
    
    document.getElementById('resultSection').style.display = 'none';
    progressSection.style.display = 'block';
    document.getElementById('generateBtn').disabled = true;
    
    startProgressPolling();
}

function hideProgress() {
    const progressSection = document.getElementById('progressSection');
    progressSection.style.display = 'none';
    document.getElementById('generateBtn').disabled = false;
    
    stopProgressPolling();
}

function showResult(message, type = 'danger') {
    const resultSection = document.getElementById('resultSection');
    const resultMessage = document.getElementById('resultMessage');
    const alertDiv = resultSection.querySelector('.alert');
    
    const iconMap = {
        'success': 'check-circle',
        'danger': 'exclamation-circle',
        'warning': 'exclamation-triangle',
        'info': 'info-circle'
    };
    
    const icon = iconMap[type] || 'info-circle';
    
    alertDiv.className = `alert alert-${type}`;
    resultMessage.innerHTML = `<i class="fas fa-${icon} me-2"></i>${message}`;
    resultSection.style.display = 'block';
    
    if (type === 'success') {
        setTimeout(() => {
            resultSection.style.display = 'none';
        }, 5000);
    }
}

document.addEventListener('DOMContentLoaded', function() {
    const form = document.getElementById('generateForm');
    if (form) {
        form.addEventListener('submit', async function(e) {
            e.preventDefault();
            
            const formData = getFormData();
            
            if (!formData) {
                showResult('Please select at least one country to continue', 'warning');
                return;
            }
            
            await downloadConfiguration(formData);
        });
    }
});

async function downloadConfiguration(formData) {
    showProgress();
    
    try {
        const endpoint = formData.app_type === 'raw-cidr' 
            ? '/api/generate/raw' 
            : '/api/generate';
        
        const response = await fetch(endpoint, {
            method: 'POST',
            headers: {
                'Content-Type': 'application/json',
            },
            body: JSON.stringify(formData)
        });
        
        hideProgress();
        
        if (response.ok) {
            const fromCache = response.headers.get('X-From-Cache') === 'true';
            const generatedAt = response.headers.get('X-Generated-At');
            
            const blob = await response.blob();
            const url = window.URL.createObjectURL(blob);
            const a = document.createElement('a');
            a.href = url;
            
            const contentDisposition = response.headers.get('Content-Disposition');
            let filename = 'geoblock_config.conf';
            if (contentDisposition) {
                const filenameMatch = contentDisposition.match(/filename="?(.+)"?/);
                if (filenameMatch) {
                    filename = filenameMatch[1];
                }
            }
            
            a.download = filename;
            document.body.appendChild(a);
            a.click();
            window.URL.revokeObjectURL(url);
            document.body.removeChild(a);
            
            if (fromCache) {
                showResult(`<i class="fas fa-bolt"></i> <strong>Lightning fast!</strong> Downloaded from cache: ${filename}`, 'success');
            } else {
                showResult(`Configuration downloaded successfully: ${filename}`, 'success');
            }
        } else {
            const error = await response.json();
            showResult(error.error || 'An error occurred during download', 'danger');
        }
    } catch (error) {
        hideProgress();
        showResult('Network error: ' + error.message, 'danger');
    }
}

function getFormData() {
    const countries = Array.from(document.querySelectorAll('input[name="countries"]:checked'))
        .map(input => input.value);
    
    if (countries.length === 0) {
        return null;
    }
    
    const useCacheCheckbox = document.getElementById('useCache');
    
    return {
        countries: countries,
        app_type: document.getElementById('appType').value,
        app_variant: document.getElementById('appVariant').value,
        aggregate: document.getElementById('aggregate').checked,
        use_cache: useCacheCheckbox ? useCacheCheckbox.checked : true
    };
}