document.addEventListener('DOMContentLoaded', function() {
    // Mock product data
    const mockProducts = [
        {"asin":"B08PP5MSVB","title":"Runner Pro Shoe - Blue","image":"https://via.placeholder.com/64","metrics":{"sales_30":1423,"cvr_30":0.18,"clicks_30":921}},
        {"asin":"B09XYZ1234","title":"Trail Grip Shoe - Black","image":"https://via.placeholder.com/64","metrics":{"sales_30":543,"cvr_30":0.12,"clicks_30":320}},
        {"asin":"B07ABC9876","title":"Daily Comfort Sneaker","image":"https://via.placeholder.com/64","metrics":{"sales_30":12,"cvr_30":0.02,"clicks_30":4}},
        {"asin":"B0A1B2C3D4","title":"Performance Running Shorts","image":"https://via.placeholder.com/64","metrics":{"sales_30":876,"cvr_30":0.15,"clicks_30":421}},
        {"asin":"B0D5E6F7G8","title":"Athletic Compression Socks","image":"https://via.placeholder.com/64","metrics":{"sales_30":321,"cvr_30":0.08,"clicks_30":154}},
        {"asin":"B0H9I8J7K6","title":"Yoga Mat - Extra Thick","image":"https://via.placeholder.com/64","metrics":{"sales_30":654,"cvr_30":0.22,"clicks_30":298}},
        {"asin":"B0L1M2N3O4","title":"Adjustable Dumbbell Set","image":"https://via.placeholder.com/64","metrics":{"sales_30":432,"cvr_30":0.14,"clicks_30":187}},
        {"asin":"B0P5Q6R7S8","title":"Foam Roller - High Density","image":"https://via.placeholder.com/64","metrics":{"sales_30":189,"cvr_30":0.07,"clicks_30":92}},
        {"asin":"B0T9U8V7W6","title":"Resistance Bands Set","image":"https://via.placeholder.com/64","metrics":{"sales_30":567,"cvr_30":0.19,"clicks_30":301}},
        {"asin":"B0X1Y2Z3A4","title":"Jump Rope - Weighted","image":"https://via.placeholder.com/64","metrics":{"sales_30":234,"cvr_30":0.11,"clicks_30":123}}
    ];

    // DOM Elements
    const selectContextBtn = document.getElementById('selectContextBtn');
    const contextPanel = document.getElementById('contextPanel');
    const parseBtn = document.getElementById('parseBtn');
    const asinInput = document.getElementById('asinInput');
    const previewSection = document.getElementById('previewSection');
    const previewGrid = document.getElementById('previewGrid');
    const totalValidCount = document.getElementById('totalValidCount');
    const selectAllBtn = document.getElementById('selectAllBtn');
    const deselectAllBtn = document.getElementById('deselectAllBtn');
    const selectedCountText = document.getElementById('selectedCountText');
    const applySelectionBtn = document.getElementById('applySelectionBtn');
    const saveContextCheckbox = document.getElementById('saveContextCheckbox');
    const contextNameInput = document.getElementById('contextNameInput');
    const tabButtons = document.querySelectorAll('.tab-btn');
    const tabContents = document.querySelectorAll('.tab-content');
    const toast = document.getElementById('toast');
    const confirmModal = document.getElementById('confirmModal');
    const modalCount = document.getElementById('modalCount');
    const confirmInput = document.getElementById('confirmInput');
    const cancelConfirmBtn = document.getElementById('cancelConfirmBtn');
    const proceedConfirmBtn = document.getElementById('proceedConfirmBtn');

    // State
    let selectedProducts = [];
    let currentTab = 'manual';

    // Event Listeners
    selectContextBtn.addEventListener('click', toggleContextPanel);
    parseBtn.addEventListener('click', parseAsins);
    selectAllBtn.addEventListener('click', selectAllProducts);
    deselectAllBtn.addEventListener('click', deselectAllProducts);
    applySelectionBtn.addEventListener('click', applySelection);
    saveContextCheckbox.addEventListener('change', toggleSaveContextInput);
    
    tabButtons.forEach(button => {
        button.addEventListener('click', () => switchTab(button.dataset.tab));
    });

    confirmInput.addEventListener('input', checkConfirmation);
    cancelConfirmBtn.addEventListener('click', closeConfirmModal);
    proceedConfirmBtn.addEventListener('click', confirmAndApply);

    // Functions
    function toggleContextPanel() {
        contextPanel.classList.toggle('hidden');
        if (!contextPanel.classList.contains('hidden')) {
            // Focus first input when panel opens
            if (currentTab === 'manual') {
                asinInput.focus();
            }
        }
    }

    function switchTab(tabName) {
        currentTab = tabName;
        
        // Update tab button states
        tabButtons.forEach(button => {
            if (button.dataset.tab === tabName) {
                button.classList.add('active-tab');
            } else {
                button.classList.remove('active-tab');
            }
        });
        
        // Show/hide tab contents
        tabContents.forEach(content => {
            if (content.id === `${tabName}Tab`) {
                content.classList.remove('hidden');
            } else {
                content.classList.add('hidden');
            }
        });
    }

    function parseAsins() {
        const asinsText = asinInput.value.trim();
        
        if (!asinsText) {
            return;
        }
        
        // Simulate API call
        setTimeout(() => {
            // Validate ASINs (mock)
            const validProducts = mockProducts.slice(0, 10); // Just show first 10 for demo
            const totalCount = 142; // Mock total count
            
            // Update UI
            renderProductPreview(validProducts);
            totalValidCount.textContent = totalCount;
            previewSection.classList.remove('hidden');
            
            // Update selected count
            updateSelectedCount();
        }, 300);
    }

    function renderProductPreview(products) {
        previewGrid.innerHTML = '';
        
        products.forEach(product => {
            const productCard = document.createElement('div');
            productCard.className = 'product-card bg-[#1E1F23] rounded-md p-3 cursor-pointer';
            productCard.dataset.asin = product.asin;
            
            productCard.innerHTML = `
                <div class="flex">
                    <div class="flex-shrink-0 mr-3">
                        <img src="${product.image}" alt="${product.title}" class="w-16 h-16 object-cover rounded">
                    </div>
                    <div class="flex-1 min-w-0">
                        <h4 class="text-sm font-medium truncate-2-lines" title="${product.title}">${product.title}</h4>
                        <div class="flex items-center mt-1">
                            <span class="bg-[#131417] text-xs px-1.5 py-0.5 rounded font-mono">${product.asin}</span>
                        </div>
                        <div class="flex flex-wrap gap-1.5 mt-2">
                            <span class="bg-[#1A1C21] text-xs px-1.5 py-0.5 rounded">Sales: ${product.metrics.sales_30}</span>
                            <span class="bg-[#1A1C21] text-xs px-1.5 py-0.5 rounded">CVR: ${(product.metrics.cvr_30 * 100).toFixed(1)}%</span>
                            <span class="bg-[#1A1C21] text-xs px-1.5 py-0.5 rounded">Clicks: ${product.metrics.clicks_30}</span>
                        </div>
                    </div>
                    <div class="ml-2 flex-shrink-0">
                        <input type="checkbox" class="product-checkbox" data-asin="${product.asin}">
                    </div>
                </div>
            `;
            
            // Add event listeners
            const checkbox = productCard.querySelector('.product-checkbox');
            checkbox.addEventListener('change', () => toggleProductSelection(product.asin, checkbox.checked));
            
            productCard.addEventListener('click', (e) => {
                if (e.target.tagName !== 'INPUT') {
                    checkbox.checked = !checkbox.checked;
                    toggleProductSelection(product.asin, checkbox.checked);
                }
            });
            
            previewGrid.appendChild(productCard);
        });
    }

    function toggleProductSelection(asin, isSelected) {
        if (isSelected && !selectedProducts.includes(asin)) {
            selectedProducts.push(asin);
        } else if (!isSelected) {
            selectedProducts = selectedProducts.filter(a => a !== asin);
        }
        
        // Update UI
        updateSelectedCount();
        highlightSelectedCards();
    }

    function selectAllProducts() {
        const checkboxes = document.querySelectorAll('.product-checkbox');
        checkboxes.forEach(checkbox => {
            checkbox.checked = true;
            if (!selectedProducts.includes(checkbox.dataset.asin)) {
                selectedProducts.push(checkbox.dataset.asin);
            }
        });
        
        updateSelectedCount();
        highlightSelectedCards();
    }

    function deselectAllProducts() {
        const checkboxes = document.querySelectorAll('.product-checkbox');
        checkboxes.forEach(checkbox => {
            checkbox.checked = false;
        });
        
        selectedProducts = [];
        updateSelectedCount();
        highlightSelectedCards();
    }

    function highlightSelectedCards() {
        const productCards = document.querySelectorAll('.product-card');
        productCards.forEach(card => {
            if (selectedProducts.includes(card.dataset.asin)) {
                card.classList.add('selected');
            } else {
                card.classList.remove('selected');
            }
        });
    }

    function updateSelectedCount() {
        const count = selectedProducts.length;
        selectedCountText.textContent = `Selected: ${count} product${count !== 1 ? 's' : ''}`;
        
        // Show warning if count is large
        if (count > 500) {
            selectedCountText.innerHTML += ` <span class="text-yellow-400">(Large selection)</span>`;
        }
    }

    function toggleSaveContextInput() {
        if (saveContextCheckbox.checked) {
            contextNameInput.classList.remove('hidden');
            contextNameInput.focus();
        } else {
            contextNameInput.classList.add('hidden');
        }
    }

    function applySelection() {
        const count = selectedProducts.length;
        
        if (count === 0) {
            showToast('Please select at least one product');
            return;
        }
        
        if (count > 5000) {
            showConfirmModal(count);
            return;
        }
        
        if (count > 500) {
            // Soft warning - just proceed
            proceedWithApply();
        } else {
            proceedWithApply();
        }
    }

    function showConfirmModal(count) {
        modalCount.textContent = count.toLocaleString();
        confirmModal.classList.remove('hidden');
        confirmInput.value = '';
        proceedConfirmBtn.disabled = true;
    }

    function closeConfirmModal() {
        confirmModal.classList.add('hidden');
    }

    function checkConfirmation() {
        proceedConfirmBtn.disabled = confirmInput.value.trim().toUpperCase() !== 'CONFIRM';
    }

    function confirmAndApply() {
        closeConfirmModal();
        proceedWithApply();
    }

    function proceedWithApply() {
        const contextName = saveContextCheckbox.checked ? contextNameInput.value.trim() : null;
        
        // Simulate API call
        setTimeout(() => {
            // Update step 1 subtitle
            const subtitle = document.querySelector('#contextPanel + div p');
            subtitle.textContent = `Context: ${selectedProducts.length} product${selectedProducts.length !== 1 ? 's' : ''} selected`;
            if (contextName) {
                subtitle.textContent += ` (Saved as "${contextName}")`;
            }
            
            // Close panel
            contextPanel.classList.add('hidden');
            
            // Show success toast
            showToast('Context applied successfully');
            
            // Reset selection for next time
            selectedProducts = [];
            asinInput.value = '';
            previewSection.classList.add('hidden');
            saveContextCheckbox.checked = false;
            contextNameInput.classList.add('hidden');
            contextNameInput.value = '';
        }, 500);
    }

    function showToast(message) {
        const toastMessage = document.getElementById('toastMessage');
        toastMessage.textContent = message;
        toast.classList.remove('hidden');
        
        setTimeout(() => {
            toast.classList.add('hidden');
        }, 3000);
    }

    // Initialize
    switchTab('manual');
});