{% extends "base.html" %}

{% block title %}PDF Manager - DocuPDF{% endblock %}

{% block styles %}
<style>
    .table-container {
        max-height: 60vh;
        overflow-y: auto;
        border: 1px solid var(--border-subtle);
        border-radius: .25rem;
    }

    .filename-col {
        max-width: 250px;
        white-space: normal;
        word-wrap: break-word;
    }
    .pdf-filename {
        word-break: break-all;
        white-space: normal;
        display: inline-block;
        max-width: 100%;
    }
    .folder-row, .pdf-row {
        cursor: pointer;
    }
    #folder-tree-move .list-group-item {
        cursor: pointer;
    }
    #folder-tree-move .list-group-item.active {
        background-color: var(--accent-primary);
        border-color: var(--accent-primary);
    }
    .editable-input {
        width: 100%;
        background-color: var(--bg-elevated);
        color: #fff;
        border: 1px solid var(--accent-primary);
        border-radius: .25rem;
        padding: .375rem .75rem;
    }
    .table-hover .highlighted-row {
        background-color: var(--accent-primary) !important;
    }
    .no-caret::after {
        display: none !important;
    }
    .ts-dropdown {
        z-index: 1060 !important;
    }
</style>
{% endblock %}

{% block content %}
<div class="container-fluid mt-4" style="width: 90%; margin: auto;">
    <!-- Header & Actions -->
    <div class="d-flex justify-content-between align-items-center flex-wrap gap-2 mb-4">
        <h1 class="mb-0">PDF Manager</h1>
        <div class="d-flex flex-wrap gap-2 align-items-center">
            <form action="/pdf_manager" method="get" class="d-flex gap-2">
                <input type="text" name="search" class="form-control bg-dark text-white border-secondary" placeholder="Search..." value="{{ request.args.get('search', '') }}">
                <button type="submit" class="btn btn-outline-secondary"><i class="bi bi-search"></i></button>
                {% if request.args.get('search') %}
                    <a href="/pdf_manager" class="btn btn-outline-danger"><i class="bi bi-x-lg"></i></a>
                {% endif %}
            </form>
            {% if all_view %}
                <a href="/pdf_manager" class="btn btn-info">Show Folders</a>
            {% else %}
                <a href="/pdf_manager?view=all" class="btn btn-info">Show All PDFs</a>
            {% endif %}
            <button class="btn btn-primary" id="create-folder-btn">Create Folder</button>
            <a href="/upload_final_pdf" class="btn btn-success">Upload</a>
            <button class="btn btn-outline-info" data-bs-toggle="modal" data-bs-target="#shortcutsModal">?</button>
        </div>
    </div>

    <!-- Bulk Actions -->
    <div class="d-flex flex-wrap justify-content-end align-items-center gap-2 mb-3">
        <div class="form-check me-3">
            <input type="checkbox" class="form-check-input" id="select-all-checkbox">
            <label class="form-check-label" for="select-all-checkbox">Select All</label>
        </div>
        <button class="btn btn-info" id="bulk-persist-btn" disabled>Toggle Persist</button>
        <button class="btn btn-primary" id="bulk-merge-btn" disabled>Merge Selected</button>
        <button class="btn btn-success" id="bulk-download-btn" disabled>Download Selected</button>
        <button class="btn btn-warning" id="bulk-move-btn" disabled>Move Selected</button>
        <button class="btn btn-warning" id="bulk-edit-btn" disabled>Edit</button>
        <button class="btn btn-primary" id="bulk-rename-btn" disabled>Rename</button>
        <button class="btn btn-danger" id="bulk-delete-btn" disabled>Delete Selected</button>
        <button class="btn btn-secondary" id="bulk-print-btn" disabled>Print Selected</button>
    </div>

    {% if not all_view %}
    <!-- Breadcrumbs -->
    <nav aria-label="breadcrumb" class="mb-3">
        <ol class="breadcrumb">
            <li class="breadcrumb-item"><a href="/pdf_manager">Home</a></li>
            {% for item in breadcrumbs %}
            <li class="breadcrumb-item"><a href="/pdf_manager/browse/{{ item.path }}">{{ item.name }}</a></li>
            {% endfor %}
        </ol>
    </nav>
    {% endif %}

    <div class="row row-cols-1 row-cols-sm-2 row-cols-md-3 row-cols-lg-4 g-4">
        {% if not all_view %}
        <!-- Folders -->
        {% for folder in subfolders %}
        <div class="col">
            <div class="card h-100 bg-dark text-white border-secondary folder-card" data-path="{{ (breadcrumbs|map(attribute='path')|list)|last if breadcrumbs else '' }}/{{ folder.name }}">
                <div class="card-body text-center">
                    <i class="bi bi-folder-fill fs-1 text-primary"></i>
                    <h5 class="card-title mt-2">{{ folder.name }}</h5>
                    <p class="card-text text-muted">{{ folder.created_at.strftime('%Y-%m-%d %I:%M %p') }}</p>
                </div>
                <div class="card-footer d-flex justify-content-between align-items-center">
                    <input type="checkbox" class="form-check-input item-checkbox" data-item-type="folder" value="{{ folder.id }}">
                    <div class="dropdown">
                        <button class="btn btn-sm btn-outline-secondary dropdown-toggle no-caret" type="button" data-bs-toggle="dropdown">
                            <i class="bi bi-three-dots-vertical"></i>
                        </button>
                        <ul class="dropdown-menu dropdown-menu-dark dropdown-menu-end">
                            <li><a class="dropdown-item rename-single-btn" href="#" data-id="{{ folder.id }}" data-type="folder"><i class="bi bi-pencil-square me-2"></i> Rename</a></li>
                            <li><hr class="dropdown-divider"></li>
                            <li><a class="dropdown-item text-danger delete-item-btn" href="#" data-item-type="folder" data-id="{{ folder.id }}"><i class="bi bi-trash me-2"></i> Delete</a></li>
                        </ul>
                    </div>
                </div>
            </div>
        </div>
        {% endfor %}
        {% endif %}

        <!-- PDFs -->
        {% for pdf in pdfs %}
        <div class="col">
            <div class="card h-100 bg-dark text-white border-secondary pdf-card">
                <div class="card-header d-flex justify-content-between align-items-center">
                    <div>
                        <i class="bi bi-file-earmark-text me-2"></i>
                        {% set viewer_url = '/view_pdf_v2/' if current_user.pdf_viewer == 'adobe' else ('/viewpdflegacy/' ~ pdf.id if current_user.pdf_viewer == 'legacy' else '/view_pdf/') %}
                        {% set pdf_path = '' if current_user.pdf_viewer == 'legacy' else pdf.filename %}
                        <a href="{{ viewer_url }}{{ pdf_path }}" target="_blank" class="text-white text-decoration-none">
                            <span class="fw-bold pdf-filename">{{ pdf.filename }}</span>
                        </a>
                    </div>
                    <div class="form-check">
                        <input type="checkbox" class="form-check-input item-checkbox" data-item-type="pdf" value="{{ pdf.id }}" style="z-index: 2; position: relative;">
                    </div>
                </div>
                <div class="card-body">
                    <p class="card-text small text-muted">
                        Subject: {{ pdf.subject or 'No subject' }}
                    </p>
                    <p class="card-text">
                        {% if pdf.tags %}
                            {% for tag in pdf.tags.split(',') %}
                                <a href="{{ url_for('main.pdf_manager', search=tag.strip()) }}" class="badge bg-secondary text-decoration-none">{{ tag.strip() }}</a>
                            {% endfor %}
                        {% endif %}
                    </p>
                </div>
                <div class="card-footer d-flex justify-content-between align-items-center">
                    <small class="text-muted">{{ pdf.created_at.strftime('%Y-%m-%d %I:%M %p') }}</small>
                    <div class="d-flex align-items-center gap-2">
                        {% if pdf.persist %}<i class="bi bi-pin-angle-fill text-primary" title="Persisted"></i>{% endif %}
                        <a href="intent://{{ request.host }}{{ url_for('main.download_file', filename=pdf.filename) }}#Intent;scheme={{ request.scheme }};action=android.intent.action.VIEW;type=application/pdf;end"
                           class="btn btn-sm btn-outline-info" title="Open in external app" target="_blank">
                            <i class="bi bi-box-arrow-up-right"></i>
                        </a>
                        <a href="{{ url_for('main.download_file', filename=pdf.filename) }}" class="btn btn-sm btn-outline-success" title="Download">
                            <i class="bi bi-download"></i>
                        </a>
                        <div class="dropdown">
                            <button class="btn btn-sm btn-outline-secondary dropdown-toggle no-caret" type="button" data-bs-toggle="dropdown">
                                <i class="bi bi-three-dots-vertical"></i>
                            </button>
                            <ul class="dropdown-menu dropdown-menu-dark dropdown-menu-end">
                                <li><a class="dropdown-item edit-single-btn" href="#" data-id="{{ pdf.id }}"><i class="bi bi-info-circle me-2"></i> Details</a></li>
                                <li><hr class="dropdown-divider"></li>
                                <li><a class="dropdown-item text-danger delete-item-btn" href="#" data-item-type="pdf" data-id="{{ pdf.id }}"><i class="bi bi-trash me-2"></i> Delete</a></li>
                            </ul>
                        </div>
                    </div>
                </div>
            </div>
        </div>
        {% endfor %}
    </div>

    <!-- Modals --><!-- Create Folder Modal -->
<div class="modal fade" id="createFolderModal" tabindex="-1">
  <div class="modal-dialog">
    <div class="modal-content bg-dark text-white">
      <div class="modal-header">
        <h5 class="modal-title">Create New Folder</h5>
        <button type="button" class="btn-close" data-bs-dismiss="modal"></button>
      </div>
      <div class="modal-body">
        <label for="newFolderName" class="form-label">Folder Name</label>
        <input type="text" class="form-control" id="newFolderName">
      </div>
      <div class="modal-footer">
        <button type="button" class="btn btn-secondary" data-bs-dismiss="modal">Cancel</button>
        <button type="button" class="btn btn-primary" id="create-folder-confirm-btn">Create</button>
      </div>
    </div>
  </div>
</div>

<!-- Move Modal -->
<div class="modal fade" id="moveModal" tabindex="-1">
  <div class="modal-dialog modal-lg">
    <div class="modal-content bg-dark text-white">
      <div class="modal-header">
        <h5 class="modal-title">Move Selected Files</h5>
        <button type="button" class="btn-close" data-bs-dismiss="modal"></button>
      </div>
      <div class="modal-body">
        <p>Select destination folder:</p>
        <div id="folder-tree-move" class="list-group" style="max-height: 300px; overflow-y: auto;"></div>
        <hr>
        <div class="input-group mb-3">
          <input type="text" class="form-control" placeholder="New subfolder name" id="new-subfolder-name">
          <button class="btn btn-outline-secondary" type="button" id="create-subfolder-btn">Create Subfolder</button>
        </div>
      </div>
      <div class="modal-footer">
        <button type="button" class="btn btn-secondary" data-bs-dismiss="modal">Cancel</button>
        <button type="button" class="btn btn-primary" id="move-confirm-btn">Move Here</button>
      </div>
    </div>
  </div>
</div>

<!-- Edit Modal -->
<div class="modal fade" id="editModal" tabindex="-1">
  <div class="modal-dialog modal-lg">
    <div class="modal-content bg-dark text-white">
      <div class="modal-header">
        <h5 class="modal-title">Edit PDF Details</h5>
        <button type="button" class="btn-close" data-bs-dismiss="modal"></button>
      </div>
      <div class="modal-body">
        <!-- Carousel Navigation (visible in bulk edit) -->
        <div id="edit-carousel-nav" class="d-flex justify-content-between align-items-center mb-3" style="display: none;">
          <button class="btn btn-outline-secondary" id="edit-prev-btn">&laquo; Previous</button>
          <span id="edit-carousel-indicator"></span>
          <button class="btn btn-outline-secondary" id="edit-next-btn">Next &raquo;</button>
        </div>

        <input type="hidden" id="edit-pdf-id">
        
        <div class="mb-3">
          <label for="edit-subject" class="form-label">Subject</label>
          <input type="text" class="form-control" id="edit-subject">
        </div>
        <div class="mb-3">
          <label for="edit-tags" class="form-label">Tags (comma-separated)</label>
          <input type="text" class="form-control" id="edit-tags">
        </div>
        <div class="mb-3">
          <label for="edit-notes" class="form-label">Notes</label>
          <textarea class="form-control" id="edit-notes" rows="3"></textarea>
        </div>
        <div class="mb-3">
          <label for="edit-filename" class="form-label">Filename</label>
          <input type="text" class="form-control" id="edit-filename" readonly>
        </div>
      </div>
      <div class="modal-footer">
        <button type="button" class="btn btn-secondary" data-bs-dismiss="modal">Close</button>
        <button type="button" class="btn btn-primary" id="save-edit-btn">Save Changes</button>
      </div>
    </div>
  </div>
</div>

<!-- Shortcuts Modal -->
<div class="modal fade" id="shortcutsModal" tabindex="-1">
  <div class="modal-dialog">
    <div class="modal-content bg-dark text-white">
      <div class="modal-header">
        <h5 class="modal-title">Keyboard Shortcuts</h5>
        <button type="button" class="btn-close" data-bs-dismiss="modal"></button>
      </div>
      <div class="modal-body">
        <ul class="list-group">
          <li class="list-group-item bg-dark text-white d-flex justify-content-between"><span>Navigate up/down</span><div><kbd>j</kbd> / <kbd>k</kbd> or <kbd>&uarr;</kbd> / <kbd>&darr;</kbd></div></li>
          <li class="list-group-item bg-dark text-white d-flex justify-content-between"><span>Select/Deselect item</span><kbd>x</kbd></li>
          <li class="list-group-item bg-dark text-white d-flex justify-content-between"><span>Toggle select all</span><kbd>s</kbd></li>
          <li class="list-group-item bg-dark text-white d-flex justify-content-between"><span>Open folder / View PDF</span><kbd>Enter</kbd></li>
          <li class="list-group-item bg-dark text-white d-flex justify-content-between"><span>Edit selected</span><kbd>e</kbd></li>
          <li class="list-group-item bg-dark text-white d-flex justify-content-between"><span>Delete selected</span><kbd>d</kbd> or <kbd>Del</kbd></li>
          <li class="list-group-item bg-dark text-white d-flex justify-content-between"><span>Toggle persist for selected</span><kbd>p</kbd></li>
          <li class="list-group-item bg-dark text-white d-flex justify-content-between"><span>Show this help</span><kbd>?</kbd></li>
        </ul>
      </div>
    </div>
  </div>
</div>

{% endblock %}

{% block scripts %}
<script>
    document.addEventListener('DOMContentLoaded', () => {
        let allSubjects = [];
        let allTags = [];
        let subjectSelect, tagsSelect;

        async function fetchSubjectsAndTags() {
            try {
                const response = await fetch('/get_all_subjects_and_tags');
                const data = await response.json();
                allSubjects = data.subjects.map(s => ({value: s, text: s}));
                allTags = data.tags.map(t => ({value: t, text: t}));
            } catch (error) {
                console.error('Failed to fetch subjects and tags:', error);
            }
        }

        const currentFolderId = {{ current_folder_id|tojson }};
        const folderTree = {{ folder_tree|tojson }};
        let selectedFolderId = null;

        const bulkRenameBtn = document.getElementById('bulk-rename-btn');
        const bulkEditBtn = document.getElementById('bulk-edit-btn');
        const bulkMergeBtn = document.getElementById('bulk-merge-btn');
        const bulkDeleteBtn = document.getElementById('bulk-delete-btn');
        const selectAllCheckbox = document.getElementById('select-all-checkbox');
        const itemCheckboxes = document.querySelectorAll('.item-checkbox');

        function getSelectedItems(type = null) {
            let items = Array.from(itemCheckboxes).filter(cb => cb.checked);
            if (type) {
                items = items.filter(cb => cb.dataset.itemType === type);
            }
            return items;
        }

        function updateBulkButtons() {
            const selectedItems = getSelectedItems();
            const selectedCount = selectedItems.length;
            const selectedPdfs = getSelectedItems('pdf');
            const selectedFolders = getSelectedItems('folder');

            document.getElementById('bulk-persist-btn').disabled = selectedCount === 0;
            document.getElementById('bulk-download-btn').disabled = selectedPdfs.length === 0;
            document.getElementById('bulk-move-btn').disabled = selectedCount === 0;
            document.getElementById('bulk-print-btn').disabled = selectedPdfs.length === 0;
            bulkDeleteBtn.disabled = selectedCount === 0;
            bulkMergeBtn.disabled = selectedPdfs.length < 2;
            bulkRenameBtn.disabled = selectedCount !== 1;
            bulkEditBtn.disabled = selectedPdfs.length === 0;
        }

        selectAllCheckbox.addEventListener('change', e => {
            itemCheckboxes.forEach(cb => cb.checked = e.target.checked);
            updateBulkButtons();
        });

        itemCheckboxes.forEach(cb => {
            cb.addEventListener('change', updateBulkButtons);
        });

        // Single Deletion
        document.querySelectorAll('.delete-item-btn').forEach(btn => {
            btn.addEventListener('click', async (e) => {
                e.preventDefault();
                e.stopPropagation();
                const itemType = btn.dataset.itemType;
                const itemId = btn.dataset.id;
                if (!confirm(`Are you sure you want to delete this ${itemType}?`)) return;

                const url = itemType === 'folder' ? `/delete_folder/${itemId}` : `/delete_generated_pdf/${itemId}`;
                const response = await fetch(url, { method: 'DELETE' });
                if (response.ok) {
                    location.reload();
                } else {
                    alert('Failed to delete item.');
                }
            });
        });

        // Single Rename
        document.querySelectorAll('.rename-single-btn').forEach(btn => {
            btn.addEventListener('click', (e) => {
                e.preventDefault();
                e.stopPropagation();
                
                const card = btn.closest('.card');
                const titleElement = card.querySelector('.card-title') || card.querySelector('.fw-bold');
                const currentName = titleElement.textContent.trim();
                const itemType = btn.dataset.type || 'pdf';
                const itemId = btn.dataset.id;

                titleElement.innerHTML = `<input type="text" class="editable-input" value="${currentName}" />`;
                const input = titleElement.querySelector('input');
                input.focus();
                input.select();

                const saveChanges = async () => {
                    const newName = input.value;
                    if (newName && newName !== currentName) {
                        const response = await fetch('/rename_item', {
                            method: 'POST',
                            headers: { 'Content-Type': 'application/json' },
                            body: JSON.stringify({
                                item_type: itemType,
                                item_id: itemId,
                                new_name: newName
                            })
                        });
                        if (response.ok) location.reload();
                        else {
                            alert('Failed to rename.');
                            titleElement.textContent = currentName;
                        }
                    } else {
                        titleElement.textContent = currentName;
                    }
                };

                input.addEventListener('blur', saveChanges);
                input.addEventListener('keydown', ev => {
                    if (ev.key === 'Enter') {
                        ev.preventDefault();
                        saveChanges();
                    }
                    if (ev.key === 'Escape') titleElement.textContent = currentName;
                });
            });
        });

        // Single Edit

        document.querySelectorAll('.folder-card').forEach(card => {
            card.addEventListener('click', e => {
                // If the click target is the folder name link, let the link handle it
                if (e.target.closest('.card-title a')) {
                    return;
                }
                // Otherwise, toggle the checkbox
                const checkbox = card.querySelector('.item-checkbox');
                if (checkbox) {
                    checkbox.checked = !checkbox.checked;
                    checkbox.dispatchEvent(new Event('change'));
                }
            });
        });

        // Make the folder name itself a clickable link
        document.querySelectorAll('.folder-card .card-title').forEach(title => {
            const card = title.closest('.folder-card');
            const folderPath = card.dataset.path;
            title.innerHTML = `<a href="/pdf_manager/browse/${folderPath}" class="text-white text-decoration-none">${title.textContent}</a>`;
        });

        document.querySelectorAll('.pdf-card').forEach(card => {
            card.addEventListener('click', e => {
                // If the click target is the link itself or a child of the link, let the link handle it
                if (e.target.closest('a.text-decoration-none')) {
                    return;
                }
                // Otherwise, toggle the checkbox
                const checkbox = card.querySelector('.item-checkbox');
                if (checkbox) {
                    checkbox.checked = !checkbox.checked;
                    checkbox.dispatchEvent(new Event('change'));
                }
            });
        });

        document.querySelectorAll('.pdf-card .form-check-input').forEach(checkbox => {
            checkbox.addEventListener('click', e => {
                e.stopPropagation(); // Prevent the card's link from firing
            });
        });

        bulkRenameBtn.addEventListener('click', () => {
            const selectedItems = getSelectedItems();
            if (selectedItems.length !== 1) return;
            const checkbox = selectedItems[0];
            const card = checkbox.closest('.card');
            const titleElement = card.querySelector('.card-title') || card.querySelector('.fw-bold');
            const currentName = titleElement.textContent.trim();

            titleElement.innerHTML = `<input type="text" class="editable-input" value="${currentName}" />`;
            const input = titleElement.querySelector('input');
            input.focus();
            input.select();

            const saveChanges = async () => {
                const newName = input.value;
                if (newName && newName !== currentName) {
                    const response = await fetch('/rename_item', {
                        method: 'POST',
                        headers: { 'Content-Type': 'application/json' },
                        body: JSON.stringify({
                            item_type: checkbox.dataset.itemType,
                            item_id: checkbox.value,
                            new_name: newName
                        })
                    });
                    if (response.ok) {
                        location.reload();
                    } else {
                        alert('Failed to rename.');
                        titleElement.textContent = currentName;
                    }
                } else {
                    titleElement.textContent = currentName;
                }
            };

            input.addEventListener('blur', saveChanges);
            input.addEventListener('keydown', e => {
                if (e.key === 'Enter') {
                    e.preventDefault();
                    saveChanges();
                }
                if (e.key === 'Escape') titleElement.textContent = currentName;
            });
        });

        bulkDeleteBtn.addEventListener('click', async () => {
            const selectedItems = getSelectedItems();
            if (selectedItems.length === 0) return;

            if (!confirm(`Are you sure you want to delete ${selectedItems.length} selected item(s)?`)) return;

            const foldersToDelete = getSelectedItems('folder').map(cb => cb.value);
            const pdfsToDelete = getSelectedItems('pdf').map(cb => cb.value);

            let allSucceeded = true;

            if (foldersToDelete.length > 0) {
                for (const folderId of foldersToDelete) {
                    const response = await fetch(`/delete_folder/${folderId}`, { method: 'DELETE' });
                    if (!response.ok) allSucceeded = false;
                }
            }

            if (pdfsToDelete.length > 0) {
                const response = await fetch('/bulk_delete_pdfs', {
                    method: 'POST',
                    headers: { 'Content-Type': 'application/json' },
                    body: JSON.stringify({ ids: pdfsToDelete })
                });
                if (!response.ok) allSucceeded = false;
            }

            if (allSucceeded) {
                location.reload();
            } else {
                alert('An error occurred during deletion.');
            }
        });

        bulkMergeBtn.addEventListener('click', async () => {
            const selectedPdfIds = getSelectedItems('pdf').map(cb => cb.value);
            if (selectedPdfIds.length < 2) {
                alert('Please select at least two PDFs to merge.');
                return;
            }
            const response = await fetch('/merge_pdfs', {
                method: 'POST',
                headers: { 'Content-Type': 'application/json' },
                body: JSON.stringify({ pdf_ids: selectedPdfIds })
            });
            if (response.ok) location.reload();
            else alert('Failed to merge PDFs.');
        });

        const editModalEl = document.getElementById('editModal');
        const editModal = new bootstrap.Modal(editModalEl);
        let editData = [];
        let currentEditIndex = 0;

        function initializeTomSelect() {
            if (subjectSelect) subjectSelect.destroy();
            if (tagsSelect) tagsSelect.destroy();
            subjectSelect = new TomSelect('#edit-subject',{ create: true, persist: false, options: allSubjects, dropdownParent: 'body' });
            tagsSelect = new TomSelect('#edit-tags',{ persist: false, createOnBlur: true, create: true, plugins: ['remove_button'], options: allTags, dropdownParent: 'body' });
        }

        function populateEditModal(index) {
            const pdf = editData[index];
            document.getElementById('edit-pdf-id').value = pdf.id;
            subjectSelect.setValue(pdf.subject || '');
            tagsSelect.setValue((pdf.tags || '').split(',').map(t => t.trim()).filter(t => t));
            document.getElementById('edit-notes').value = pdf.notes || '';
            document.getElementById('edit-filename').value = pdf.filename || '';
            if (editData.length > 1) {
                document.getElementById('edit-carousel-nav').style.display = 'flex';
                document.getElementById('edit-carousel-indicator').textContent = `${index + 1} / ${editData.length}`;
            } else {
                document.getElementById('edit-carousel-nav').style.display = 'none';
            }
        }

        bulkEditBtn.addEventListener('click', async () => {
            const selectedItems = getSelectedItems('pdf');
            if (selectedItems.length === 0) return;
            const ids = selectedItems.map(item => item.value);
            await openEditModal(ids);
        });

        document.getElementById('edit-prev-btn').addEventListener('click', () => {
            if (currentEditIndex > 0) {
                currentEditIndex--;
                populateEditModal(currentEditIndex);
            }
        });

        document.getElementById('edit-next-btn').addEventListener('click', () => {
            if (currentEditIndex < editData.length - 1) {
                currentEditIndex++;
                populateEditModal(currentEditIndex);
            }
        });

        document.getElementById('save-edit-btn').addEventListener('click', async () => {
            try {
                const pdfId = document.getElementById('edit-pdf-id').value;
                const updatedData = {
                    subject: subjectSelect.getValue(),
                    tags: tagsSelect.getValue(),
                    notes: document.getElementById('edit-notes').value,
                };
                const response = await fetch(`/update_pdf_details/${pdfId}`, {
                    method: 'POST',
                    headers: { 'Content-Type': 'application/json' },
                    body: JSON.stringify(updatedData)
                });
                if (response.ok) {
                    editData[currentEditIndex] = { ...editData[currentEditIndex], ...updatedData };
                    if (currentEditIndex === editData.length - 1) {
                        editModal.hide();
                        location.reload();
                    } else {
                        currentEditIndex++;
                        populateEditModal(currentEditIndex);
                    }
                } else {
                    alert(`Failed to save changes: ${(await response.json()).error}`);
                }
            } catch (error) {
                alert(`An error occurred: ${error}`);
            }
        });

        function renderFolderTree(folders, container, level = 0) {
            const ul = document.createElement('ul');
            ul.className = 'list-group';
            if (level > 0) ul.style.display = 'none';
            container.appendChild(ul);
            folders.forEach(folder => {
                const li = document.createElement('li');
                li.className = 'list-group-item list-group-item-action bg-dark text-white';
                li.style.paddingLeft = `${level * 20 + 12}px`;
                li.dataset.folderId = folder.id;
                let icon = folder.children && folder.children.length > 0 ? '<i class="bi bi-chevron-right"></i>' : '<i class="bi bi-folder"></i>';
                li.innerHTML = `${icon} ${folder.name}`;
                li.addEventListener('click', e => {
                    e.stopPropagation();
                    document.querySelectorAll('#folder-tree-move .list-group-item').forEach(item => item.classList.remove('active'));
                    li.classList.add('active');
                    selectedFolderId = folder.id;
                    const childUl = li.querySelector('ul');
                    if (childUl) {
                        const iconEl = li.querySelector('i');
                        if (childUl.style.display === 'none') {
                            childUl.style.display = 'block';
                            iconEl.classList.replace('bi-chevron-right', 'bi-chevron-down');
                        } else {
                            childUl.style.display = 'none';
                            iconEl.classList.replace('bi-chevron-down', 'bi-chevron-right');
                        }
                    }
                });
                ul.appendChild(li);
                if (folder.children) renderFolderTree(folder.children, li, level + 1);
            });
        }

        document.getElementById('bulk-move-btn').addEventListener('click', () => {
            const folderTreeContainer = document.getElementById('folder-tree-move');
            folderTreeContainer.innerHTML = '';
            const rootItem = document.createElement('a');
            rootItem.href = '#';
            rootItem.className = 'list-group-item list-group-item-action bg-dark text-white';
            rootItem.dataset.folderId = 'null';
            rootItem.innerHTML = `<i class="bi bi-house-door"></i> Root`;
            rootItem.addEventListener('click', e => {
                e.preventDefault();
                document.querySelectorAll('#folder-tree-move .list-group-item').forEach(item => item.classList.remove('active'));
                rootItem.classList.add('active');
                selectedFolderId = null;
            });
            folderTreeContainer.appendChild(rootItem);
            renderFolderTree(folderTree, folderTreeContainer);
            new bootstrap.Modal(document.getElementById('moveModal')).show();
        });

        document.getElementById('create-subfolder-btn').addEventListener('click', async () => {
            const newFolderName = document.getElementById('new-subfolder-name').value;
            if (!newFolderName) return alert('Please enter a name for the new subfolder.');
            const response = await fetch('/create_folder', {
                method: 'POST',
                headers: { 'Content-Type': 'application/json' },
                body: JSON.stringify({ new_folder_name: newFolderName, parent_id: selectedFolderId })
            });
            if (response.ok) location.reload();
            else alert('Failed to create subfolder.');
        });

        document.getElementById('move-confirm-btn').addEventListener('click', async () => {
            const pdfIdsToMove = getSelectedItems('pdf').map(cb => cb.value);
            if(pdfIdsToMove.length === 0) return alert("No PDFs selected to move.");
            const response = await fetch('/bulk_move_pdfs', {
                method: 'POST',
                headers: { 'Content-Type': 'application/json' },
                body: JSON.stringify({ ids: pdfIdsToMove, target_folder_id: selectedFolderId })
            });
            if (response.ok) location.reload();
            else alert('Failed to move files.');
        });
        
        document.getElementById('create-folder-btn').addEventListener('click', () => new bootstrap.Modal(document.getElementById('createFolderModal')).show());
        document.getElementById('create-folder-confirm-btn').addEventListener('click', async () => {
            const newFolderName = document.getElementById('newFolderName').value;
            const response = await fetch('/create_folder', {
                method: 'POST',
                headers: { 'Content-Type': 'application/json' },
                body: JSON.stringify({ new_folder_name: newFolderName, parent_id: currentFolderId })
            });
            if (response.ok) location.reload();
            else alert('Failed to create folder.');
        });
        
        document.getElementById('bulk-persist-btn').addEventListener('click', async () => {
            const selectedIds = getSelectedItems().map(cb => cb.value);
            const response = await fetch('/bulk_toggle_persist', {
                method: 'POST',
                headers: { 'Content-Type': 'application/json' },
                body: JSON.stringify({ ids: selectedIds })
            });
            if (response.ok) location.reload();
            else alert('Failed to toggle persistence.');
        });

        document.getElementById('bulk-download-btn').addEventListener('click', async () => {
            const selectedIds = getSelectedItems('pdf').map(cb => cb.value);
            const response = await fetch('/bulk_download_pdfs', {
                method: 'POST',
                headers: { 'Content-Type': 'application/json' },
                body: JSON.stringify({ ids: selectedIds })
            });
            if (response.ok) {
                const blob = await response.blob();
                const url = window.URL.createObjectURL(blob);
                const a = document.createElement('a');
                a.style.display = 'none';
                a.href = url;
                a.download = 'pdfs.zip';
                document.body.appendChild(a);
                a.click();
                window.URL.revokeObjectURL(url);
            } else {
                alert('Failed to download PDFs.');
            }
        });

        document.getElementById('bulk-print-btn').addEventListener('click', async (e) => {
            e.preventDefault();
            const selectedItems = getSelectedItems('pdf');
            if (selectedItems.length === 0) {
                alert('Please select at least one PDF to print.');
                return;
            }

            const formData = new FormData();
            selectedItems.forEach(item => {
                formData.append('pdf_ids', item.value);
            });

            try {
                const response = await fetch('/print_pdfs', {
                    method: 'POST',
                    body: formData
                });

                const result = await response.json();

                if (result.success) {
                    window.open(result.url, '_blank');
                } else {
                    alert(`Failed to generate PDF for printing: ${result.error}`);
                }
            } catch (error) {
                console.error('Error printing PDFs:', error);
                alert('An unexpected error occurred while printing.');
            }
        });

        async function openEditModal(ids) {
            await fetchSubjectsAndTags();
            editData = [];
            for (const id of ids) {
                const response = await fetch(`/get_pdf_details/${id}`);
                if (response.ok) editData.push(await response.json());
            }
            if (editData.length > 0) {
                currentEditIndex = 0;
                initializeTomSelect();
                populateEditModal(currentEditIndex);
                editModal.show();
            }
        }

        // Single Edit
        document.querySelectorAll('.edit-single-btn').forEach(btn => {
            btn.addEventListener('click', async (e) => {
                e.preventDefault();
                const id = btn.dataset.id;
                await openEditModal([id]);
            });
        });

        updateBulkButtons();

        const cards = Array.from(document.querySelectorAll('.col'));
        let currentRowIndex = -1;
        const shortcutsModal = new bootstrap.Modal(document.getElementById('shortcutsModal'));

        function highlightRow(index) {
            cards.forEach(card => card.querySelector('.card')?.classList.remove('border-primary'));
            if (index >= 0 && index < cards.length) {
                const card = cards[index].querySelector('.card');
                card.classList.add('border-primary');
                card.scrollIntoView({ block: 'center', behavior: 'smooth' });
            }
        }

        document.addEventListener('keydown', (e) => {
            if (e.target.tagName === 'INPUT' || e.target.tagName === 'TEXTAREA') return;
            const isModalOpen = document.querySelector('.modal.show');
            if (isModalOpen && e.key !== 'Escape') {
                if (e.key === '?') shortcutsModal.hide();
                return;
            }

            switch (e.key) {
                case 'j': case 'ArrowDown':
                    e.preventDefault();
                    if (currentRowIndex < cards.length - 1) {
                        currentRowIndex++;
                        highlightRow(currentRowIndex);
                    }
                    break;
                case 'k': case 'ArrowUp':
                    e.preventDefault();
                    if (currentRowIndex > 0) {
                        currentRowIndex--;
                        highlightRow(currentRowIndex);
                    }
                    break;
                case 'x':
                    e.preventDefault();
                    if (currentRowIndex >= 0) {
                        const checkbox = cards[currentRowIndex].querySelector('.item-checkbox');
                        if (checkbox) {
                            checkbox.checked = !checkbox.checked;
                            checkbox.dispatchEvent(new Event('change'));
                        }
                    }
                    break;
                case 's':
                    e.preventDefault();
                    selectAllCheckbox.checked = !selectAllCheckbox.checked;
                    selectAllCheckbox.dispatchEvent(new Event('change'));
                    break;
                case 'Enter':
                    e.preventDefault();
                    if (currentRowIndex >= 0) {
                        const card = cards[currentRowIndex].querySelector('.card');
                        if (card.classList.contains('folder-card')) {
                            window.location.href = `/pdf_manager/browse/${card.dataset.path}`;
                        } else {
                            const link = card.querySelector('.card-header a.text-white');
                            if (link) link.click();
                        }
                    }
                    break;
                case 'e':
                    e.preventDefault();
                    if (!bulkEditBtn.disabled) bulkEditBtn.click();
                    break;
                case 'd': case 'Delete':
                    e.preventDefault();
                    if (!bulkDeleteBtn.disabled) bulkDeleteBtn.click();
                    break;
                case 'p':
                    e.preventDefault();
                    const persistBtn = document.getElementById('bulk-persist-btn');
                    if (!persistBtn.disabled) persistBtn.click();
                    break;
                case '?':
                    e.preventDefault();
                    shortcutsModal.show();
                    break;
            }
        });

        if (cards.length > 0) {
            currentRowIndex = 0;
            highlightRow(currentRowIndex);
        }
        
        fetchSubjectsAndTags();
    });
</script>
{% endblock %}