export class BaseFileList extends HTMLElement {
    constructor() {
        super();
        this.files = [];
        this.folders = [];
        this.selectedFiles = new Set();
        this.selectedFolders = new Set();
        this.boundHandleClick = this.handleClick.bind(this);
        this.boundHandleDblClick = this.handleDblClick.bind(this);
        this.boundHandleChange = this.handleChange.bind(this);
    }

    connectedCallback() {
        this.addEventListener('click', this.boundHandleClick);
        this.addEventListener('dblclick', this.boundHandleDblClick);
        this.addEventListener('change', this.boundHandleChange);
    }

    disconnectedCallback() {
        this.removeEventListener('click', this.boundHandleClick);
        this.removeEventListener('dblclick', this.boundHandleDblClick);
        this.removeEventListener('change', this.boundHandleChange);
    }

    isEditableFile(filename, mimeType) {
        if (mimeType && mimeType.startsWith('text/')) return true;

        const editableExtensions = [
            'txt', 'md', 'log', 'json', 'js', 'py', 'html', 'css',
            'xml', 'yaml', 'yml', 'sh', 'bat', 'ini', 'conf', 'cfg'
        ];
        const extension = filename.split('.').pop().toLowerCase();
        return editableExtensions.includes(extension);
    }

    getFileIcon(mimeType) {
        if (mimeType.startsWith('image/')) return '📷';
        if (mimeType.startsWith('video/')) return '🎥';
        if (mimeType.startsWith('audio/')) return '🎵';
        if (mimeType.includes('pdf')) return '📄';
        if (mimeType.includes('text')) return '📄';
        return '📄';
    }

    formatFileSize(bytes) {
        if (bytes < 1024) return bytes + ' B';
        if (bytes < 1048576) return (bytes / 1024).toFixed(1) + ' KB';
        if (bytes < 1073741824) return (bytes / 1048576).toFixed(1) + ' MB';
        return (bytes / 1073741824).toFixed(1) + ' GB';
    }

    renderFolder(folder) {
        const isSelected = this.selectedFolders.has(folder.id);
        const starIcon = folder.is_starred ? '&#9733;' : '&#9734;';
        const starAction = folder.is_starred ? 'unstar-folder' : 'star-folder';
        const actions = this.getFolderActions(folder);

        return `
            <div class="file-item folder-item ${isSelected ? 'selected' : ''}" data-folder-id="${folder.id}">
                <input type="checkbox" class="select-item" data-type="folder" data-id="${folder.id}" ${isSelected ? 'checked' : ''}>
                <div class="file-icon">&#128193;</div>
                <div class="file-name">${folder.name}</div>
                <div class="file-actions-menu">
                    ${actions}
                </div>
            </div>
        `;
    }

    renderFile(file) {
        const isSelected = this.selectedFiles.has(file.id);
        const icon = this.getFileIcon(file.mime_type);
        const size = this.formatFileSize(file.size);
        const starIcon = file.is_starred ? '&#9733;' : '&#9734;';
        const starAction = file.is_starred ? 'unstar-file' : 'star-file';
        const actions = this.getFileActions(file);

        return `
            <div class="file-item ${isSelected ? 'selected' : ''}" data-file-id="${file.id}">
                <input type="checkbox" class="select-item" data-type="file" data-id="${file.id}" ${isSelected ? 'checked' : ''}>
                <div class="file-icon">${icon}</div>
                <div class="file-name">${file.name}</div>
                <div class="file-size">${size}</div>
                <div class="file-actions-menu">
                    ${actions}
                </div>
            </div>
        `;
    }

    getFolderActions(folder) {
        return '';
    }

    getFileActions(file) {
        return '';
    }

    handleClick(e) {
        const target = e.target;

        if (target.id === 'clear-selection-btn') {
            this.clearSelection();
            return;
        }

        if (target.classList.contains('action-btn')) {
            e.stopPropagation();
            const action = target.dataset.action;
            const id = parseInt(target.dataset.id);
            this.handleAction(action, id);
            return;
        }

        if (target.classList.contains('select-item')) {
            e.stopPropagation();
            return;
        }

        const fileItem = target.closest('.file-item:not(.folder-item)');
        if (fileItem) {
            const fileId = parseInt(fileItem.dataset.fileId);
            const file = this.files.find(f => f.id === fileId);

            if (this.isEditableFile(file.name, file.mime_type)) {
                this.dispatchEvent(new CustomEvent('edit-file', {
                    detail: { file: file },
                    bubbles: true
                }));
            } else {
                this.dispatchEvent(new CustomEvent('photo-click', {
                    detail: { photo: file },
                    bubbles: true
                }));
            }
        }
    }

    handleDblClick(e) {
        const folderItem = e.target.closest('.folder-item');
        if (folderItem) {
            const folderId = parseInt(folderItem.dataset.folderId);
            this.dispatchEvent(new CustomEvent('folder-open', { detail: { folderId } }));
        }
    }

    handleChange(e) {
        const target = e.target;

        if (target.id === 'select-all') {
            this.toggleSelectAll(target.checked);
            return;
        }

        if (target.classList.contains('select-item')) {
            const type = target.dataset.type;
            const id = parseInt(target.dataset.id);
            this.toggleSelectItem(type, id, target.checked);
        }
    }

    toggleSelectItem(type, id, checked) {
        if (type === 'file') {
            if (checked) {
                this.selectedFiles.add(id);
            } else {
                this.selectedFiles.delete(id);
            }
        } else if (type === 'folder') {
            if (checked) {
                this.selectedFolders.add(id);
            } else {
                this.selectedFolders.delete(id);
            }
        }

        const item = this.querySelector(`[data-${type}-id="${id}"]`);
        if (item) {
            if (checked) {
                item.classList.add('selected');
            } else {
                item.classList.remove('selected');
            }
        }

        this.updateSelectionUI();
    }

    toggleSelectAll(checked) {
        this.selectedFiles.clear();
        this.selectedFolders.clear();

        if (checked) {
            this.files.forEach(file => this.selectedFiles.add(file.id));
            this.folders.forEach(folder => this.selectedFolders.add(folder.id));
        }

        this.querySelectorAll('.select-item').forEach(checkbox => {
            checkbox.checked = checked;
        });

        this.querySelectorAll('.file-item').forEach(item => {
            if (checked) {
                item.classList.add('selected');
            } else {
                item.classList.remove('selected');
            }
        });

        this.updateSelectionUI();
    }

    clearSelection() {
        this.selectedFiles.clear();
        this.selectedFolders.clear();
        this.querySelectorAll('.select-item').forEach(checkbox => {
            checkbox.checked = false;
        });
        this.querySelectorAll('.file-item').forEach(item => {
            item.classList.remove('selected');
        });
        this.updateSelectionUI();
    }

    updateSelectionUI() {
        const hasSelected = this.selectedFiles.size > 0 || this.selectedFolders.size > 0;
        const totalItems = this.files.length + this.folders.length;
        const totalSelected = this.selectedFiles.size + this.selectedFolders.size;
        const allSelected = totalItems > 0 && totalSelected === totalItems;

        const selectAllCheckbox = this.querySelector('#select-all');
        const selectAllLabel = this.querySelector('label[for="select-all"]');
        const batchActionsDiv = this.querySelector('.batch-actions');

        if (selectAllCheckbox) {
            selectAllCheckbox.checked = allSelected;
            this.updateIndeterminateState();
        }

        if (selectAllLabel) {
            selectAllLabel.textContent = hasSelected ? `${totalSelected} selected` : 'Select all';
        }

        if (hasSelected && !batchActionsDiv) {
            this.createBatchActionsBar();
        } else if (!hasSelected && batchActionsDiv) {
            batchActionsDiv.remove();
        }
    }

    createBatchActionsBar() {
    }

    updateIndeterminateState() {
        const selectAllCheckbox = this.querySelector('#select-all');
        if (selectAllCheckbox) {
            const totalItems = this.files.length + this.folders.length;
            const totalSelected = this.selectedFiles.size + this.selectedFolders.size;
            const hasSelected = totalSelected > 0;
            const allSelected = totalItems > 0 && totalSelected === totalItems;

            selectAllCheckbox.indeterminate = hasSelected && !allSelected;
        }
    }

    async handleAction(action, id) {
    }
}