(function ($) {
    'use strict';

    $(document).ready(function () {

        var $wrap = $('.studiou-fpp-upload-wrap');
        if (!$wrap.length) {
            return;
        }

        // ==========================================
        // Config + data
        // ==========================================
        var cfg = {
            productId:   parseInt($wrap.data('product-id'), 10) || 0,
            maxFileSize: parseInt($wrap.data('max-file-size'), 10) || 50,
            maxUploads:  parseInt($wrap.data('max-uploads'), 10) || 0,
            chunkSize:   parseInt(studiouWcfppFront.chunkSize, 10) || 1048576
        };
        var i18n = studiouWcfppFront.i18n || {};
        var data = window.studiouFppCardData || {variants: [], batchFiles: []};
        var variants = data.variants || [];

        var $dropzone  = $('#studiou-fpp-dropzone');
        var $fileInput = $('#studiou-fpp-file-input');
        var $cards     = $('#studiou-fpp-cards');
        var $messages  = $wrap.find('.studiou-fpp-messages');

        var originalGallery = {};

        // ==========================================
        // Bootstrap
        // ==========================================
        initExistingCards();
        initDropzone();
        initCardDelegation();
        initOverviewDelegation();
        applyHeroImage(data.heroPreviewUrl);

        // ==========================================
        // Card construction
        // ==========================================
        function initExistingCards() {
            (data.batchFiles || []).forEach(function (f) {
                var $card = buildCard({
                    fileRecordId: f.file_record_id,
                    attachmentId: f.attachment_id,
                    fileName:     f.file_name,
                    thumbUrl:     f.thumb_url,
                    variationId:  f.variation_id || 0,
                    uploading:    false
                });
                $cards.append($card);
            });
            refreshMaxReachedState();
        }

        function buildCard(opts) {
            var $card = $('<div class="studiou-fpp-card"></div>');
            $card.attr('data-file-record-id', opts.fileRecordId || '');
            $card.attr('data-attachment-id',  opts.attachmentId || '');
            if (opts.uploading) $card.addClass('studiou-fpp-card-uploading');

            // Remove-upload button (×)
            $card.append('<button type="button" class="studiou-fpp-card-remove" title="' +
                escAttr(i18n.removeFile || 'Remove') + '" aria-label="' +
                escAttr(i18n.removeFile || 'Remove') + '">&times;</button>');

            // Thumb column
            var $thumb = $('<div class="studiou-fpp-card-thumb"></div>');
            if (opts.thumbUrl) {
                $thumb.append($('<img>').attr('src', opts.thumbUrl).attr('alt', opts.fileName || ''));
            } else {
                $thumb.append('<div class="studiou-fpp-card-thumb-placeholder"></div>');
            }
            var $progress = $('<div class="studiou-fpp-card-progress"></div>');
            $progress.append('<div class="studiou-fpp-card-progress-fill"></div>');
            $progress.append('<span class="studiou-fpp-card-progress-text">0%</span>');
            $thumb.append($progress);
            $card.append($thumb);

            // Body column
            var $body = $('<div class="studiou-fpp-card-body"></div>');
            $body.append($('<div class="studiou-fpp-card-name"></div>').text(opts.fileName || ''));

            var $controls = $('<div class="studiou-fpp-card-controls"></div>');
            $controls.append(buildVariantSelect(opts.variationId || 0));
            $controls.append(buildQtyStepper());
            $body.append($controls);

            var $priceRow = $('<div class="studiou-fpp-card-price-row"></div>');
            $priceRow.append('<span class="studiou-fpp-card-price">&mdash;</span>');
            $priceRow.append('<span class="studiou-fpp-card-badge" style="display:none;"></span>');
            $priceRow.append('<button type="button" class="button studiou-fpp-card-addtocart">' +
                escHtml(i18n.addToCart || 'Add to cart') + '</button>');
            $body.append($priceRow);

            $card.append($body);

            if (!opts.uploading) {
                updateCardPrice($card);
            }
            return $card;
        }

        function buildVariantSelect(initialVariationId) {
            var $select = $('<select class="studiou-fpp-card-variant"></select>');
            $select.append('<option value="0">' + escHtml(i18n.selectVariant || 'Select variant') + '</option>');
            for (var i = 0; i < variants.length; i++) {
                var v = variants[i];
                var priceLabel = v.base_price ? ' — ' + formatPrice(v.base_price) : '';
                var $opt = $('<option></option>')
                    .val(v.id)
                    .text(v.label + priceLabel)
                    .attr('data-base-price', v.base_price);
                if (!v.in_stock) {
                    $opt.prop('disabled', true).text(v.label + priceLabel + ' — ' + (i18n.outOfStock || 'out of stock'));
                }
                $select.append($opt);
            }
            if (initialVariationId) {
                $select.val(initialVariationId);
            }
            return $select;
        }

        function buildQtyStepper() {
            var $stepper = $('<div class="studiou-fpp-card-qty"></div>');
            $stepper.append('<button type="button" class="studiou-fpp-qty-btn studiou-fpp-qty-minus">&minus;</button>');
            $stepper.append('<input type="number" class="studiou-fpp-qty-input" min="1" step="1" value="1">');
            $stepper.append('<button type="button" class="studiou-fpp-qty-btn studiou-fpp-qty-plus">+</button>');
            return $stepper;
        }

        // ==========================================
        // Card live updates
        // ==========================================
        function initCardDelegation() {
            $cards.on('change', '.studiou-fpp-card-variant', function () {
                updateCardPrice($(this).closest('.studiou-fpp-card'));
            });
            $cards.on('input change keyup', '.studiou-fpp-qty-input', function () {
                updateCardPrice($(this).closest('.studiou-fpp-card'));
            });
            $cards.on('click', '.studiou-fpp-qty-plus', function () {
                var $input = $(this).closest('.studiou-fpp-card-qty').find('.studiou-fpp-qty-input');
                $input.val((parseInt($input.val(), 10) || 1) + 1).trigger('change');
            });
            $cards.on('click', '.studiou-fpp-qty-minus', function () {
                var $input = $(this).closest('.studiou-fpp-card-qty').find('.studiou-fpp-qty-input');
                var v = Math.max(1, (parseInt($input.val(), 10) || 1) - 1);
                $input.val(v).trigger('change');
            });
            $cards.on('click', '.studiou-fpp-card-addtocart', function () {
                onAddToCartClick($(this).closest('.studiou-fpp-card'));
            });
            $cards.on('click', '.studiou-fpp-card-remove', function () {
                onRemoveUploadClick($(this).closest('.studiou-fpp-card'));
            });
        }

        function findVariant(variationId) {
            variationId = parseInt(variationId, 10) || 0;
            if (!variationId) return null;
            for (var i = 0; i < variants.length; i++) {
                if (variants[i].id === variationId) return variants[i];
            }
            return null;
        }

        function resolveTier(tiers, qty) {
            if (!tiers || !tiers.length) return null;
            var match = null;
            for (var i = 0; i < tiers.length; i++) {
                if (tiers[i].from_qty <= qty) match = tiers[i];
                else break;
            }
            return match;
        }

        function updateCardPrice($card) {
            var $price = $card.find('.studiou-fpp-card-price');
            var $badge = $card.find('.studiou-fpp-card-badge');
            var $btn   = $card.find('.studiou-fpp-card-addtocart');

            var variationId = parseInt($card.find('.studiou-fpp-card-variant').val(), 10) || 0;
            var qty         = Math.max(1, parseInt($card.find('.studiou-fpp-qty-input').val(), 10) || 1);
            var variant     = findVariant(variationId);

            if (!variant || !variant.base_price) {
                $price.html('&mdash;');
                $badge.hide();
                $btn.prop('disabled', true);
                return;
            }

            var tier = resolveTier(variant.tiers || [], qty);
            var unit = variant.base_price;
            if (tier && tier.percent > 0) {
                unit = variant.base_price * (1 - (tier.percent / 100));
                $badge.show().text('−' + formatPercent(tier.percent));
            } else {
                $badge.hide();
            }
            var lineTotal = unit * qty;
            $price.html(formatPriceHtml(lineTotal));

            var uploading = $card.hasClass('studiou-fpp-card-uploading');
            $btn.prop('disabled', uploading);
        }

        // ==========================================
        // Upload dropzone
        // ==========================================
        function initDropzone() {
            $dropzone.on('dragover dragenter', function (e) {
                e.preventDefault(); e.stopPropagation();
                $(this).addClass('studiou-fpp-dragover');
            });
            $dropzone.on('dragleave drop', function (e) {
                e.preventDefault(); e.stopPropagation();
                $(this).removeClass('studiou-fpp-dragover');
            });
            $dropzone.on('drop', function (e) {
                var files = e.originalEvent.dataTransfer.files;
                enqueueFiles(files);
            });
            $dropzone.on('click', function () {
                if ($dropzone.hasClass('studiou-fpp-dropzone-disabled')) return;
                $fileInput.trigger('click');
            });
            $fileInput.on('change', function () {
                enqueueFiles(this.files);
                $fileInput.val('');
            });
        }

        var uploadQueue = [];
        var activeUpload = false;

        function enqueueFiles(fileList) {
            if (!fileList || !fileList.length) return;
            clearMessages();

            if (cfg.maxUploads > 0) {
                var existing = $cards.children('.studiou-fpp-card').length;
                var available = Math.max(0, cfg.maxUploads - existing - uploadQueue.length);
                if (available <= 0) {
                    showMessage(formatI18n(i18n.maxUploadsReached, cfg.maxUploads), 'error');
                    return;
                }
                if (fileList.length > available) {
                    showMessage(formatI18n(i18n.maxUploadsReached, cfg.maxUploads), 'error');
                }
                for (var i = 0; i < Math.min(fileList.length, available); i++) {
                    pushFile(fileList[i]);
                }
            } else {
                for (var j = 0; j < fileList.length; j++) {
                    pushFile(fileList[j]);
                }
            }
            refreshMaxReachedState();
            drainQueue();
        }

        function pushFile(file) {
            var maxBytes = cfg.maxFileSize * 1024 * 1024;
            if (file.size > maxBytes) {
                showMessage(formatI18n(i18n.fileTooLarge, cfg.maxFileSize), 'error');
                return;
            }
            var $card = buildCard({
                fileRecordId: 0,
                attachmentId: 0,
                fileName:     file.name,
                thumbUrl:     '',
                variationId:  0,
                uploading:    true
            });
            $cards.append($card);
            uploadQueue.push({file: file, $card: $card});
        }

        function drainQueue() {
            if (activeUpload || !uploadQueue.length) return;
            activeUpload = true;
            var next = uploadQueue.shift();
            uploadOne(next.file, next.$card, function () {
                activeUpload = false;
                drainQueue();
            });
        }

        function uploadOne(file, $card, done) {
            var totalChunks = Math.ceil(file.size / cfg.chunkSize);
            var uploadId = 'upload_' + Date.now() + '_' + Math.random().toString(36).slice(2, 10);
            var currentChunk = 0;
            var $fill = $card.find('.studiou-fpp-card-progress-fill');
            var $text = $card.find('.studiou-fpp-card-progress-text');
            $card.find('.studiou-fpp-card-progress').show();

            function next() {
                var start = currentChunk * cfg.chunkSize;
                var end   = Math.min(start + cfg.chunkSize, file.size);
                var blob  = file.slice(start, end);

                var form = new FormData();
                form.append('action',       'studiou_wcfpp_upload_chunk');
                form.append('nonce',        studiouWcfppFront.nonce);
                form.append('product_id',   cfg.productId);
                form.append('upload_id',    uploadId);
                form.append('chunk_index',  currentChunk);
                form.append('total_chunks', totalChunks);
                form.append('file_name',    file.name);
                form.append('file_size',    file.size);
                form.append('chunk', blob, 'chunk');

                var isLast = (currentChunk === totalChunks - 1);
                if (isLast) {
                    $fill.css('width', '100%');
                    $text.text(i18n.processing || 'Processing...');
                }

                $.ajax({
                    url: studiouWcfppFront.ajaxUrl,
                    type: 'POST',
                    data: form,
                    processData: false,
                    contentType: false,
                    timeout: isLast ? 120000 : 30000,
                    success: function (response) {
                        if (!response.success) {
                            failUpload($card, response.data ? response.data.message : (i18n.uploadError || 'Upload failed.'));
                            done();
                            return;
                        }
                        if (!response.data.complete) {
                            currentChunk++;
                            var pct = Math.round((currentChunk / totalChunks) * 100);
                            $fill.css('width', pct + '%');
                            $text.text(pct + '%');
                            next();
                        } else {
                            finishUpload($card, response.data);
                            done();
                        }
                    },
                    error: function () {
                        failUpload($card, i18n.uploadError || 'Upload failed.');
                        done();
                    }
                });
            }
            next();
        }

        function finishUpload($card, res) {
            $card.removeClass('studiou-fpp-card-uploading');
            $card.find('.studiou-fpp-card-progress').hide();
            $card.attr('data-file-record-id', res.file_record_id);
            $card.attr('data-attachment-id',  res.attachment_id);
            var $img = $card.find('.studiou-fpp-card-thumb img');
            if ($img.length) {
                $img.attr('src', res.thumbnail_url);
            } else {
                $card.find('.studiou-fpp-card-thumb-placeholder').replaceWith(
                    $('<img>').attr('src', res.thumbnail_url).attr('alt', res.file_name)
                );
            }
            updateCardPrice($card);
            refreshMaxReachedState();

            // If this is now the first/only card, swap the hero gallery image
            if ($cards.children('.studiou-fpp-card').index($card) === 0) {
                applyHeroImage(res.preview_url || res.thumbnail_url);
            }
        }

        function failUpload($card, message) {
            $card.remove();
            showMessage(message, 'error');
            refreshMaxReachedState();
        }

        function refreshMaxReachedState() {
            if (cfg.maxUploads <= 0) return;
            var reached = $cards.children('.studiou-fpp-card').length >= cfg.maxUploads;
            $dropzone.toggleClass('studiou-fpp-dropzone-disabled', reached);
        }

        // ==========================================
        // Remove upload (per-card × button)
        // ==========================================
        function onRemoveUploadClick($card) {
            var fileRecordId = parseInt($card.attr('data-file-record-id'), 10) || 0;
            if (!fileRecordId) {
                // Still uploading — just cancel locally
                $card.remove();
                refreshMaxReachedState();
                return;
            }
            $.ajax({
                url: studiouWcfppFront.ajaxUrl,
                type: 'POST',
                data: {
                    action: 'studiou_wcfpp_remove_upload',
                    nonce:  studiouWcfppFront.nonce,
                    file_record_id: fileRecordId
                },
                success: function (response) {
                    if (response.success) {
                        var wasFirst = ($cards.children('.studiou-fpp-card').index($card) === 0);
                        $card.remove();
                        refreshMaxReachedState();

                        if (wasFirst) {
                            var $nextFirst = $cards.children('.studiou-fpp-card').first();
                            if ($nextFirst.length) {
                                var nextImg = $nextFirst.find('.studiou-fpp-card-thumb img').attr('src');
                                applyHeroImage(nextImg || '');
                            } else {
                                restoreHeroImage();
                            }
                        }
                    } else {
                        showMessage(response.data ? response.data.message : (i18n.error || 'Error'), 'error');
                    }
                },
                error: function () {
                    showMessage(i18n.error || 'Error', 'error');
                }
            });
        }

        // ==========================================
        // Add to cart
        // ==========================================
        function onAddToCartClick($card) {
            var fileRecordId = parseInt($card.attr('data-file-record-id'), 10) || 0;
            var variationId  = parseInt($card.find('.studiou-fpp-card-variant').val(), 10) || 0;
            var qty          = Math.max(1, parseInt($card.find('.studiou-fpp-qty-input').val(), 10) || 1);

            if (!fileRecordId) {
                showMessage(i18n.uploadFile || 'Please upload a file.', 'error');
                return;
            }
            if (!variationId) {
                showMessage(i18n.selectVariant || 'Please select a variant.', 'error');
                return;
            }

            var $btn = $card.find('.studiou-fpp-card-addtocart');
            $btn.prop('disabled', true);

            $.ajax({
                url: studiouWcfppFront.ajaxUrl,
                type: 'POST',
                data: {
                    action:         'studiou_wcfpp_add_file_to_cart',
                    nonce:          studiouWcfppFront.nonce,
                    file_record_id: fileRecordId,
                    variation_id:   variationId,
                    quantity:       qty
                },
                success: function (response) {
                    if (response.success) {
                        showMessage(i18n.addedToCart || 'Added to cart.', 'success');
                        if (response.data && response.data.overview_html) {
                            updateOverview(response.data.overview_html);
                        }
                    } else {
                        showMessage(response.data ? response.data.message : (i18n.addToCartError || 'Could not add to cart.'), 'error');
                    }
                },
                error: function () {
                    showMessage(i18n.addToCartError || 'Could not add to cart.', 'error');
                },
                complete: function () {
                    $btn.prop('disabled', false);
                }
            });
        }

        // ==========================================
        // Order overview
        // ==========================================
        function initOverviewDelegation() {
            // Remove-line on overview panel (cart-only, upload stays)
            $(document).on('click', '.studiou-fpp-overview-remove', function (e) {
                var $link = $(this);
                var href = $link.attr('href');
                // Only intercept if the link has a nonce arg — otherwise let browser navigate
                if (!href || href.indexOf('studiou-fpp-remove-line') < 0) return;
                e.preventDefault();

                var $line = $link.closest('.studiou-fpp-overview-line');
                var key = $line.data('cart-item-key');
                if (!key) return;

                $.ajax({
                    url: studiouWcfppFront.ajaxUrl,
                    type: 'POST',
                    data: {
                        action:         'studiou_wcfpp_remove_cart_line',
                        nonce:          studiouWcfppFront.nonce,
                        cart_item_key:  key
                    },
                    success: function (response) {
                        if (response.success && response.data && response.data.overview_html) {
                            updateOverview(response.data.overview_html);
                        } else if (!response.success) {
                            showMessage(response.data ? response.data.message : (i18n.error || 'Error'), 'error');
                        }
                    },
                    error: function () {
                        showMessage(i18n.error || 'Error', 'error');
                    }
                });
            });
        }

        function updateOverview(html) {
            var $new = $(html);
            var $existing = $('#studiou-fpp-overview');
            if ($existing.length) {
                $existing.replaceWith($new);
            } else {
                $wrap.after($new);
            }
            $(document).trigger('studiou-fpp:cart-updated');
        }

        // ==========================================
        // Hero image
        // ==========================================
        function applyHeroImage(url) {
            if (!url) return;
            var selectors = [
                '.woocommerce-product-gallery__image img',
                '.product .wp-post-image',
                '.product-image img',
                '.product-thumbnail img',
                '.entry-summary img.attachment-woocommerce_thumbnail',
                '.product-gallery img:first'
            ];
            var $img = null;
            for (var i = 0; i < selectors.length; i++) {
                $img = $(selectors[i]).first();
                if ($img.length) break;
            }
            if (!$img || !$img.length) return;

            if (!originalGallery.src) {
                originalGallery.src    = $img.attr('src');
                originalGallery.srcset = $img.attr('srcset') || '';
                originalGallery.sizes  = $img.attr('sizes') || '';
                var $link = $img.closest('a');
                if ($link.length) originalGallery.href = $link.attr('href');
            }
            $img.attr('src', url).removeAttr('srcset').removeAttr('sizes');
            var $a = $img.closest('a');
            if ($a.length) $a.attr('href', url);
        }

        function restoreHeroImage() {
            if (!originalGallery.src) return;
            var selectors = [
                '.woocommerce-product-gallery__image img',
                '.product .wp-post-image',
                '.product-image img',
                '.product-thumbnail img',
                '.entry-summary img.attachment-woocommerce_thumbnail',
                '.product-gallery img:first'
            ];
            var $img = null;
            for (var i = 0; i < selectors.length; i++) {
                $img = $(selectors[i]).first();
                if ($img.length) break;
            }
            if (!$img || !$img.length) return;
            $img.attr('src', originalGallery.src);
            if (originalGallery.srcset) $img.attr('srcset', originalGallery.srcset);
            if (originalGallery.sizes)  $img.attr('sizes',  originalGallery.sizes);
            if (originalGallery.href)   $img.closest('a').attr('href', originalGallery.href);
            originalGallery = {};
        }

        // ==========================================
        // Helpers
        // ==========================================
        function showMessage(text, type) {
            var cls = type === 'error' ? 'studiou-fpp-msg-error'
                    : type === 'success' ? 'studiou-fpp-msg-success'
                    : 'studiou-fpp-msg-info';
            $messages.html('<div class="studiou-fpp-msg ' + cls + '">' + escHtml(text) + '</div>');
        }

        function clearMessages() { $messages.empty(); }

        function escHtml(str) {
            var div = document.createElement('div');
            div.appendChild(document.createTextNode(str == null ? '' : String(str)));
            return div.innerHTML;
        }

        function escAttr(str) {
            return String(str == null ? '' : str).replace(/"/g, '&quot;');
        }

        function formatI18n(tpl, val) {
            if (!tpl) return String(val);
            return tpl.replace('%d', val).replace('%s', val);
        }

        function formatPercent(p) {
            var n = parseFloat(p) || 0;
            var str = n.toFixed(2).replace(/\.?0+$/, '');
            return str + ' %';
        }

        function formatPrice(amount) {
            return formatPriceHtml(amount);
        }

        function formatPriceHtml(amount) {
            var c = studiouWcfppFront.currency || {};
            var decimals = parseInt(c.decimals, 10); if (isNaN(decimals)) decimals = 2;
            var decSep = c.decimalSeparator || '.';
            var thouSep = c.thousandSeparator || ',';
            var fmt = c.priceFormat || '%1$s%2$s';
            var symbol = c.symbol || '';
            var fixed = parseFloat(amount).toFixed(decimals);
            var parts = fixed.split('.');
            var intPart = parts[0].replace(/\B(?=(\d{3})+(?!\d))/g, thouSep);
            var decPart = parts.length > 1 ? parts[1] : '';
            var numStr = decPart ? intPart + decSep + decPart : intPart;
            var sym = '<span class="woocommerce-Price-currencySymbol">' + symbol + '</span>';
            return '<span class="woocommerce-Price-amount amount">' +
                fmt.replace('%1$s', sym).replace('%2$s', numStr) +
                '</span>';
        }
    });
})(jQuery);