// js/ui.js - 管理所有与UI渲染和DOM操作相关的函数

// 集中管理所有需要操作的DOM元素
export const DOMElements = {
    sidebar: document.getElementById('sidebar'),
    menuToggleBtn: document.getElementById('menu-toggle-btn'),
    mainContent: document.querySelector('.main-content'),
    configListPanel: document.getElementById('config-list-panel'),
    configFormPanel: document.getElementById('config-form-panel'),
    renderedOutputPanel: document.getElementById('rendered-output-panel'),
    configForm: document.getElementById('config-form'),
    formTitle: document.getElementById('form-title'),
    backToListBtn: document.getElementById('back-to-list-btn'),
    domainInput: document.getElementById('domain'),
    originalFilenameInput: document.getElementById('original-filename'),
    headersContainer: document.getElementById('headers-container'),
    addNewConfigBtn: document.getElementById('add-new-config-btn'),
    cancelEditBtn: document.getElementById('cancel-edit-btn'),
    addHeaderBtn: document.getElementById('add-header-btn'),
    configListContainer: document.getElementById('config-list'),
    renderedContentCode: document.getElementById('rendered-content'),
    toastContainer: document.getElementById('toast-container'),
    dialogContainer: document.getElementById('dialog-container'),
    themeToggleInput: document.getElementById('theme-toggle-input'),
    caddyStatusIndicator: document.getElementById('caddy-status-indicator'),
    caddyActionButtonContainer: document.getElementById('caddy-action-button-container'),
    logoutBtn: document.getElementById('logout-btn'),
    upstreamFieldset: document.getElementById('upstream-fieldset'),
    fileserverFieldset: document.getElementById('fileserver-fieldset'),
    upstreamHeadersContainer: document.getElementById('upstream-headers-container'),
    addUpstreamHeaderBtn: document.getElementById('add-upstream-header-btn'),
};

export function switchView(viewToShow) {
    [DOMElements.configListPanel, DOMElements.configFormPanel, DOMElements.renderedOutputPanel]
        .forEach(view => view.classList.add('hidden'));
    if (viewToShow) viewToShow.classList.remove('hidden');
    DOMElements.addNewConfigBtn.disabled = (viewToShow === DOMElements.configFormPanel);
}

export function renderConfigList(filenames) {
    DOMElements.configListContainer.innerHTML = '';
    if (!filenames || filenames.length === 0) {
        DOMElements.configListContainer.innerHTML = '<p>还没有任何配置，请创建一个。</p>';
        return;
    }
    filenames.forEach(filename => {
        const item = document.createElement('li');
        item.className = 'config-item';
        item.dataset.filename = filename;
        item.innerHTML = `<span class="config-item-name">${filename}</span><div class="config-item-actions"><button class="btn-icon edit-btn" title="编辑"><i class="fa-solid fa-pen-to-square"></i></button><button class="btn-icon delete-btn" title="删除"><i class="fa-solid fa-trash-can"></i></button></div>`;
        DOMElements.configListContainer.appendChild(item);
    });
}

export function createCustomSelect(containerId, options, onSelect) {
    const container = document.getElementById(containerId);
    container.innerHTML = `<div class="select-selected"></div><div class="select-items"></div><input type="hidden" name="tmpl_type">`;
    const selectedDiv = container.querySelector('.select-selected');
    const itemsDiv = container.querySelector('.select-items');
    const hiddenInput = container.querySelector('input[type="hidden"]');
    itemsDiv.innerHTML = '';
    options.forEach((option, index) => {
        const item = document.createElement('div');
        item.textContent = option;
        item.dataset.value = option;
        if (index === 0) {
            selectedDiv.textContent = option;
            hiddenInput.value = option;
        }
        item.addEventListener('click', function(e) {
            selectedDiv.textContent = this.textContent;
            hiddenInput.value = this.dataset.value;
            itemsDiv.classList.remove('select-show');
            selectedDiv.classList.remove('select-arrow-active');
            onSelect && onSelect(this.dataset.value);
            e.stopPropagation();
        });
        itemsDiv.appendChild(item);
    });
    selectedDiv.addEventListener('click', (e) => {
        e.stopPropagation();
        document.querySelectorAll('.select-items.select-show').forEach(openSelect => {
            if (openSelect !== itemsDiv) {
                openSelect.classList.remove('select-show');
                openSelect.previousElementSibling.classList.remove('select-arrow-active');
            }
        });
        itemsDiv.classList.toggle('select-show');
        selectedDiv.classList.toggle('select-arrow-active');
    });
    document.addEventListener('click', () => {
        itemsDiv.classList.remove('select-show');
        selectedDiv.classList.remove('select-arrow-active');
    });
}

export function addKeyValueInput(container, keyName, valueName, key = '', value = '') {
    const div = document.createElement('div');
    div.className = 'header-entry';
    div.innerHTML = `
        <input type="text" name="${keyName}" placeholder="Key" value="${key}">
        <input type="text" name="${valueName}" placeholder="Value" value="${value}">
        <button type="button" class="btn-icon" onclick="this.parentElement.remove()" title="移除此条目">
            <i class="fa-solid fa-xmark"></i>
        </button>`;
    container.appendChild(div);
}

export function fillForm(config, originalFilename) {
    DOMElements.originalFilenameInput.value = originalFilename;
    DOMElements.domainInput.value = config.domain;
    document.getElementById('upstream').value = config.upstream?.upstream || '';
    document.getElementById('file_dir_path').value = config.file_server?.file_dir_path || '';
    document.getElementById('enable_browser').checked = config.file_server?.enable_browser || false;
    const selectContainer = document.getElementById('custom-select-tmpl');
    selectContainer.querySelector('.select-selected').textContent = config.tmpl_type;
    selectContainer.querySelector('input[type="hidden"]').value = config.tmpl_type;
    DOMElements.headersContainer.innerHTML = '';
    if (config.headers) Object.entries(config.headers).forEach(([k, v]) => v.forEach(val => addKeyValueInput(DOMElements.headersContainer, 'header_key', 'header_value', k, val)));
    DOMElements.upstreamHeadersContainer.innerHTML = '';
    if (config.upstream?.upstream_headers) Object.entries(config.upstream.upstream_headers).forEach(([k, v]) => v.forEach(val => addKeyValueInput(DOMElements.upstreamHeadersContainer, 'upstream_header_key', 'upstream_header_value', k, val)));
    document.getElementById('enable_log').checked = config.log?.enable_log || false;
    document.getElementById('enable_error_page').checked = config.error_page?.enable_error_page || false;
    document.getElementById('enable_encode').checked = config.encode?.enable_encode || false;
}

export function showRenderedConfig(configs, filename) {
    const targetConfig = configs.find(c => c.filename === filename);
    if (targetConfig && targetConfig.rendered_content) {
        DOMElements.renderedContentCode.textContent = atob(targetConfig.rendered_content);
        DOMElements.renderedOutputPanel.classList.remove('hidden');
    } else {
        DOMElements.renderedOutputPanel.classList.add('hidden');
    }
}

function createButton(text, className, onClick) {
    const button = document.createElement('button');
    button.className = `btn ${className}`;
    button.innerHTML = `<span>${text}</span>`;
    button.addEventListener('click', onClick);
    return button;
}

export function updateCaddyStatusView(status, handlers) {
    const { handleReloadCaddy, handleStopCaddy, handleStartCaddy } = handlers;
    const dot = DOMElements.caddyStatusIndicator.querySelector('.status-dot');
    const text = DOMElements.caddyStatusIndicator.querySelector('.status-text');
    const buttonContainer = DOMElements.caddyActionButtonContainer;
    dot.className = 'status-dot';
    buttonContainer.innerHTML = '';
    let statusText, dotClass;
    switch (status) {
        case 'running':
            statusText = '运行中'; dotClass = 'running';
            buttonContainer.appendChild(createButton('重载配置', 'btn-warning', handleReloadCaddy));
            buttonContainer.appendChild(createButton('停止 Caddy', 'btn-danger', handleStopCaddy));
            break;
        case 'stopped':
            statusText = '已停止'; dotClass = 'stopped';
            buttonContainer.appendChild(createButton('启动 Caddy', 'btn-success', handleStartCaddy));
            break;
        case 'checking': statusText = '检查中...'; dotClass = 'checking'; break;
        default: statusText = '状态未知'; dotClass = 'error'; break;
    }
    text.textContent = statusText;
    dot.classList.add(dotClass);
}

export function updateFormVisibility(selectedTemplate, availableTemplates) {
    const showUpstream = selectedTemplate === 'reverse_proxy' && availableTemplates.includes('reverse_proxy');
    const showFileServer = selectedTemplate === 'file_server' && availableTemplates.includes('file_server');
    DOMElements.upstreamFieldset.classList.toggle('hidden', !showUpstream);
    DOMElements.fileserverFieldset.classList.toggle('hidden', !showFileServer);
}