(() => {
    /**
     * 统一管理搜索输入、模糊匹配与结果渲染
     */
    class SearchBar {
        constructor(options = {}) {
            this.input = options.input || null;
            this.clearButton = options.clearButton || null;
            this.fileList = options.fileList || null;
            this.emptyState = options.emptyState || null;
            this.getFiles = options.getFiles || (() => []);
            this.renderAll = options.renderAll || (() => {});
            this.createFileItem = options.createFileItem || (() => null);
            this.noResultMessage = options.noResultMessage || '没有找到匹配的文件';

            this.emptyStatePrimary = this.emptyState ? this.emptyState.querySelector('p') : null;
            this.defaultEmptyMessage = this.emptyStatePrimary ? this.emptyStatePrimary.textContent : '';

            this.bindEvents();
            this.toggleClearButton(this.getKeyword());
        }

        bindEvents() {
            if (this.input) {
                this.input.addEventListener('input', () => this.handleInput());
            }

            if (this.clearButton) {
                this.clearButton.addEventListener('click', () => this.clear());
            }
        }

        handleInput() {
            const keyword = this.getKeyword();
            this.toggleClearButton(keyword);

            if (!keyword) {
                this.restoreEmptyStateMessage();
                this.renderAll();
                return;
            }

            const filteredFiles = this.filterFiles(keyword);
            this.renderFilteredFiles(filteredFiles);
        }

        getKeyword() {
            if (!this.input) return '';
            return this.input.value.trim().toLowerCase();
        }

        filterFiles(keyword) {
            const files = this.getFiles() || [];
            return files.filter(file => {
                if (!file || !file.name) return false;
                return file.name.toLowerCase().includes(keyword);
            });
        }

        renderFilteredFiles(files) {
            if (!this.fileList) return;

            this.fileList.innerHTML = '';

            if (!files.length) {
                if (this.emptyState) {
                    this.emptyState.classList.add('show');
                }
                if (this.emptyStatePrimary) {
                    this.emptyStatePrimary.textContent = this.noResultMessage;
                }
                return;
            }

            if (this.emptyState) {
                this.emptyState.classList.remove('show');
            }

            files.forEach(file => {
                const item = this.createFileItem(file);
                if (item) {
                    this.fileList.appendChild(item);
                }
            });
        }

        clear(options = {}) {
            const { shouldRender = true } = options;

            if (this.input) {
                this.input.value = '';
            }

            this.toggleClearButton('');
            this.restoreEmptyStateMessage();

            if (shouldRender) {
                this.renderAll();
            }
        }

        toggleClearButton(keyword) {
            if (!this.clearButton) return;
            this.clearButton.style.display = keyword ? 'flex' : 'none';
        }

        restoreEmptyStateMessage() {
            if (this.emptyStatePrimary) {
                this.emptyStatePrimary.textContent = this.defaultEmptyMessage;
            }
        }
    }

    window.SearchBar = SearchBar;
})();