<script setup lang="ts">
import { computed, type PropType, ref, watch, defineExpose, onMounted, onBeforeUnmount, nextTick } from 'vue'; // 添加 nextTick
import { useI18n } from 'vue-i18n';
// import { storeToRefs } from 'pinia'; // 移除 storeToRefs
import MonacoEditor from './MonacoEditor.vue'; // 导入 Monaco Editor 组件
import FileEditorTabs from './FileEditorTabs.vue'; // 导入标签栏组件 (路径确认无误)
// import { useFileEditorStore } from '../stores/fileEditor.store'; // 移除 Store 导入
import type { FileTab } from '../stores/fileEditor.store'; // 保留类型导入
import { useFocusSwitcherStore } from '../stores/focusSwitcher.store'; // +++ 导入焦点切换 Store +++
import { useSessionStore } from '../stores/session.store'; // +++ 导入会话 Store +++
import { useSettingsStore } from '../stores/settings.store'; // +++ 导入设置 Store +++
import { storeToRefs } from 'pinia'; // +++ 导入 storeToRefs +++
import { useWorkspaceEventEmitter } from '../composables/workspaceEvents'; // +++ 新增导入 +++

const { t } = useI18n();
const emitWorkspaceEvent = useWorkspaceEventEmitter(); // +++ 获取事件发射器 +++
const focusSwitcherStore = useFocusSwitcherStore(); // +++ 实例化焦点切换 Store +++
const sessionStore = useSessionStore(); // +++ 实例化会话 Store +++
const settingsStore = useSettingsStore(); // +++ 实例化设置 Store +++
const { shareFileEditorTabsBoolean } = storeToRefs(settingsStore); // +++ 获取共享设置 +++

// --- Props ---
const props = defineProps({
  tabs: {
    type: Array as PropType<FileTab[]>,
    required: true,
  },
  activeTabId: {
    type: String as PropType<string | null>,
    default: null,
  },
  sessionId: { // 需要 sessionId 来区分保存请求等 (虽然 tabs 里也有)
    type: String as PropType<string | null>,
    default: null,
  },
});




// --- 计算属性，用于模板绑定 ---
const activeTab = computed((): FileTab | null => {
  if (!props.activeTabId) return null;
  return props.tabs.find(tab => tab.id === props.activeTabId) ?? null;
});

// Monaco Editor 的 v-model 处理
const localEditorContent = ref('');
const encodingSelectRef = ref<HTMLSelectElement | null>(null); // Ref for the select element

// Function to calculate and set the select width
const updateSelectWidth = () => {
  nextTick(() => { // Ensure DOM is updated before measuring
    if (!encodingSelectRef.value) return;

    const selectElement = encodingSelectRef.value;
    const selectedOption = selectElement.options[selectElement.selectedIndex];

    if (!selectedOption) return;

    // Create a temporary span to measure text width
    const tempSpan = document.createElement('span');
    // Copy relevant styles (adjust as needed for accurate measurement)
    const styles = window.getComputedStyle(selectElement);
    tempSpan.style.fontSize = styles.fontSize;
    tempSpan.style.fontFamily = styles.fontFamily;
    tempSpan.style.fontWeight = styles.fontWeight;
    tempSpan.style.letterSpacing = styles.letterSpacing;
    tempSpan.style.paddingLeft = styles.paddingLeft; // Include padding for accuracy
    tempSpan.style.paddingRight = styles.paddingRight;
    // tempSpan.style.borderLeftWidth = styles.borderLeftWidth; // Border might not be needed for width calc
    // tempSpan.style.borderRightWidth = styles.borderRightWidth;
    tempSpan.style.visibility = 'hidden'; // Make it invisible
    tempSpan.style.position = 'absolute'; // Prevent layout shift
    tempSpan.style.whiteSpace = 'nowrap'; // Prevent wrapping
    tempSpan.style.left = '-9999px'; // Move off-screen

    tempSpan.textContent = selectedOption.text;
    document.body.appendChild(tempSpan);

    const textWidth = tempSpan.offsetWidth;
    document.body.removeChild(tempSpan);

    // Set the select width (add extra space for dropdown arrow, adjust as needed)
    const arrowPadding = 25; // Increased padding for arrow and visual spacing
    selectElement.style.width = `${textWidth + arrowPadding}px`;
    // console.log(`[EditorContainer] Setting select width for "${selectedOption.text}" to ${textWidth + arrowPadding}px`);
  });
};


// 监听 activeTab 的变化，重置 localEditorContent 并更新 select 宽度
watch(activeTab, (newTab) => {
    // console.log('[EditorContainer] Active tab changed, updating local content.');
    localEditorContent.value = newTab?.content ?? '';
    updateSelectWidth(); // Update select width when tab changes
}, { immediate: true }); // immediate: true ensures it runs on initial load too

// 移除用于调试的 watch 函数
// 当本地编辑器内容变化时，通知父组件 (WorkspaceView)
watch(localEditorContent, (newContent) => {
    // console.log('[EditorContainer] Local content changed, checking if emit needed.');
    if (activeTab.value && newContent !== activeTab.value.content) {
        // console.log(`[EditorContainer] Emitting update:content for tab ${activeTab.value.id}`);
        // 只有当内容实际改变时才发出事件
        emitWorkspaceEvent('editor:updateContent', { tabId: activeTab.value.id, content: newContent });
        // 注意：isModified 状态应该由 Store 根据 content 和 originalContent 计算
    }
});

// orderedTabs 直接使用 props
const orderedTabs = computed(() => props.tabs);


const currentTabIsLoading = computed(() => activeTab.value?.isLoading ?? false);
const currentTabLoadingError = computed(() => activeTab.value?.loadingError ?? null);
const currentTabIsSaving = computed(() => activeTab.value?.isSaving ?? false);
const currentTabSaveStatus = computed(() => activeTab.value?.saveStatus ?? 'idle');
const currentTabSaveError = computed(() => activeTab.value?.saveError ?? null);
const currentTabLanguage = computed(() => activeTab.value?.language ?? 'plaintext');
const currentTabFilePath = computed(() => activeTab.value?.filePath ?? '');
const currentTabIsModified = computed(() => activeTab.value?.isModified ?? false); // 用于显示修改状态
// +++ 新增：计算当前选择的编码 +++
const currentSelectedEncoding = computed(() => activeTab.value?.selectedEncoding ?? 'utf-8');
// +++ 新增：计算当前活动标签的会话名称 +++
const currentTabSessionName = computed(() => {
  const sessionId = activeTab.value?.sessionId;
  if (!sessionId) return null;
  return sessionStore.sessions.get(sessionId)?.connectionName ?? null; // 修正：使用 connectionName
});

// Watch for changes in the selected encoding to update width
watch(currentSelectedEncoding, () => {
  updateSelectWidth();
});

// +++ 新增：编码选项 +++
// 注意：这里的 value 需要与 iconv-lite 支持的标签匹配 (后端使用)
// 扩展编码列表以包含更多常用选项
const encodingOptions = ref([
  // Unicode
  { value: 'utf-8', text: 'UTF-8' },
  { value: 'utf-16le', text: 'UTF-16 LE' },
  { value: 'utf-16be', text: 'UTF-16 BE' },
  // Chinese
  { value: 'gbk', text: 'GBK' },
  { value: 'gb18030', text: 'GB18030' },
  { value: 'big5', text: 'Big5 (Traditional Chinese)' },
  // Japanese
  { value: 'shift_jis', text: 'Shift-JIS' },
  { value: 'euc-jp', text: 'EUC-JP' },
  // Korean
  { value: 'euc-kr', text: 'EUC-KR' },
  // Western European
  { value: 'iso-8859-1', text: 'ISO-8859-1 (Latin-1)' },
  { value: 'iso-8859-15', text: 'ISO-8859-15 (Latin-9)' },
  { value: 'cp1252', text: 'Windows-1252' }, // Western European
  // Central European
  { value: 'iso-8859-2', text: 'ISO-8859-2 (Latin-2)' },
  { value: 'cp1250', text: 'Windows-1250' }, // Central European
  // Cyrillic
  { value: 'iso-8859-5', text: 'ISO-8859-5 (Cyrillic)' },
  { value: 'cp1251', text: 'Windows-1251 (Cyrillic)' },
  { value: 'koi8-r', text: 'KOI8-R' },
  { value: 'koi8-u', text: 'KOI8-U' },
  // Greek
  { value: 'iso-8859-7', text: 'ISO-8859-7 (Greek)' },
  { value: 'cp1253', text: 'Windows-1253 (Greek)' },
  // Turkish
  { value: 'iso-8859-9', text: 'ISO-8859-9 (Turkish)' },
  { value: 'cp1254', text: 'Windows-1254 (Turkish)' },
  // Hebrew
  { value: 'iso-8859-8', text: 'ISO-8859-8 (Hebrew)' },
  { value: 'cp1255', text: 'Windows-1255 (Hebrew)' },
  // Arabic
  { value: 'iso-8859-6', text: 'ISO-8859-6 (Arabic)' },
  { value: 'cp1256', text: 'Windows-1256 (Arabic)' },
  // Baltic
  { value: 'iso-8859-4', text: 'ISO-8859-4 (Baltic)' }, // Latin-4
  { value: 'iso-8859-13', text: 'ISO-8859-13 (Baltic)' }, // Latin-7
  { value: 'cp1257', text: 'Windows-1257 (Baltic)' },
  // Vietnamese
  { value: 'cp1258', text: 'Windows-1258 (Vietnamese)' },
  // Thai
  { value: 'tis-620', text: 'TIS-620 (Thai)' }, // Often cp874
  { value: 'cp874', text: 'Windows-874 (Thai)' },
]);


// --- 事件处理 ---
const handleSaveRequest = () => {
  if (activeTab.value) {
    emitWorkspaceEvent('editor:saveTab', { tabId: activeTab.value.id }); // 发出保存请求事件
  }
};

// +++ 新增：处理编码更改事件 +++
const handleEncodingChange = (event: Event) => {
  const target = event.target as HTMLSelectElement;
  const newEncoding = target.value;
  if (activeTab.value && newEncoding && newEncoding !== currentSelectedEncoding.value) {
    console.log(`[EditorContainer] Encoding changed to ${newEncoding} for tab ${activeTab.value.id}`);
    emitWorkspaceEvent('editor:changeEncoding', { tabId: activeTab.value.id, encoding: newEncoding });
  }
};


// 注意：关闭/最小化按钮现在应该在 WorkspaceView 控制 Pane，而不是这里
// const handleCloseContainer = () => { ... };
// const handleMinimizeContainer = () => { ... };

// 新增：Monaco Editor 组件的引用
const monacoEditorRef = ref<InstanceType<typeof MonacoEditor> | null>(null);

// 新增：聚焦活动编辑器的方法
const focusActiveEditor = (): boolean => {
  if (monacoEditorRef.value) {
    monacoEditorRef.value.focus();
    return true; // 聚焦成功
  }
  return false; // 聚焦失败
};

// 新增：暴露聚焦方法
defineExpose({ focusActiveEditor });

// +++ 注册/注销自定义聚焦动作 +++
let unregisterFocusFn: (() => void) | null = null; // 保存注销函数

onMounted(() => {
  // 注册动作并保存返回的注销函数
  unregisterFocusFn = focusSwitcherStore.registerFocusAction('fileEditorActive', focusActiveEditor);
  // +++ 添加键盘事件监听器 +++
  window.addEventListener('keydown', handleKeyDown);
});

onBeforeUnmount(() => {
  // 调用保存的注销函数（如果存在）
  if (unregisterFocusFn) {
    unregisterFocusFn();
  }
  // +++ 移除键盘事件监听器 +++
  window.removeEventListener('keydown', handleKeyDown);
});

// +++ 新增：处理键盘事件以切换标签 +++
const handleKeyDown = (event: KeyboardEvent) => {
  // 检查是否在编辑器内部或其容器内触发（避免全局冲突）
  // 这里简化处理，假设只要此组件挂载就监听，更精确的判断可能需要检查 event.target
  if (event.altKey && (event.key === 'ArrowLeft' || event.key === 'ArrowRight')) {
    event.preventDefault();
    event.stopPropagation();

    if (!props.activeTabId || props.tabs.length <= 1) {
      return; // 没有活动标签或只有一个标签，无需切换
    }

    const currentIndex = props.tabs.findIndex(tab => tab.id === props.activeTabId);
    if (currentIndex === -1) {
      return; // 未找到当前标签索引
    }

    let nextIndex: number;
    if (event.key === 'ArrowLeft') {
      nextIndex = (currentIndex - 1 + props.tabs.length) % props.tabs.length;
    } else { // ArrowRight
      nextIndex = (currentIndex + 1) % props.tabs.length;
    }

    const nextTabId = props.tabs[nextIndex]?.id;
    if (nextTabId) {
      emitWorkspaceEvent('editor:activateTab', { tabId: nextTabId });
    }
  }
};
</script>

<template>
  <!-- 这个容器不再控制自己的显示/隐藏，由 WorkspaceView 的 Pane 控制 -->
  <div class="file-editor-container">

      <!-- 1. 标签栏 -->
      <FileEditorTabs
        :tabs="orderedTabs"
        :active-tab-id="props.activeTabId"
        @activate-tab="(tabId: string) => emitWorkspaceEvent('editor:activateTab', { tabId })"
        @close-tab="(tabId: string) => emitWorkspaceEvent('editor:closeTab', { tabId })"
        @close-other-tabs="(tabId: string) => emitWorkspaceEvent('editor:closeOtherTabs', { tabId })"
        @close-tabs-to-right="(tabId: string) => emitWorkspaceEvent('editor:closeTabsToRight', { tabId })"
        @close-tabs-to-left="(tabId: string) => emitWorkspaceEvent('editor:closeTabsToLeft', { tabId })"
      />

      <!-- 2. 编辑器头部 (显示当前激活标签信息) -->
      <!-- 移除关闭/最小化按钮，这些由 WorkspaceView 控制 -->
      <div v-if="activeTab" class="editor-header">
        <span>
          {{ t('fileManager.editingFile') }}<template v-if="shareFileEditorTabsBoolean && currentTabSessionName">({{ currentTabSessionName }})</template>: {{ currentTabFilePath }}
          <span v-if="currentTabIsModified" class="modified-indicator">*</span>
        </span>
        <div class="editor-actions">
          <!-- +++ 新增：编码选择下拉菜单 +++ -->
          <div class="encoding-select-wrapper" v-if="activeTab && !currentTabIsLoading">
            <select
              ref="encodingSelectRef"
              :value="currentSelectedEncoding"
              @change="handleEncodingChange"
              class="encoding-select"
              :title="t('fileManager.changeEncodingTooltip', '更改文件编码')"
            >
              <option v-for="option in encodingOptions" :key="option.value" :value="option.value">
                {{ option.text }}
              </option>
            </select>
          </div>
          <span v-else-if="activeTab" class="encoding-select-placeholder">{{ t('fileManager.loadingEncoding', '加载中...') }}</span>
          <!-- +++ 结束新增 +++ -->

          <span v-if="currentTabSaveStatus === 'saving'" class="save-status saving">{{ t('fileManager.saving') }}...</span>
          <span v-if="currentTabSaveStatus === 'success'" class="save-status success">✅ {{ t('fileManager.saveSuccess') }}</span>
          <span v-if="currentTabSaveStatus === 'error'" class="save-status error">❌ {{ t('fileManager.saveError') }}: {{ currentTabSaveError }}</span>
          <button @click="handleSaveRequest" :disabled="currentTabIsSaving || currentTabIsLoading || !!currentTabLoadingError || !activeTab || !currentTabIsModified" class="save-btn">
            {{ t('fileManager.actions.save') }}
          </button>
          <!-- 关闭/最小化按钮已移除 -->
        </div>
      </div>
      <!-- 如果没有活动标签页，显示简化头部 -->
      <div v-else class="editor-header editor-header-placeholder">
        <span>{{ t('fileManager.noOpenFile') }}</span>
        <!-- 动作区域留空或只显示通用按钮 -->
      </div>

      <!-- 3. 编辑器内容区域 -->
      <div class="editor-content-area">
        <div v-if="currentTabIsLoading" class="editor-loading">{{ t('fileManager.loadingFile') }}</div>
        <div v-else-if="currentTabLoadingError" class="editor-error">{{ currentTabLoadingError }}</div>
        <MonacoEditor
          v-else-if="activeTab"
          ref="monacoEditorRef"
          :key="activeTab.id"
          v-model="localEditorContent" 
          :language="currentTabLanguage"
          theme="vs-dark"
          class="editor-instance"
          @request-save="handleSaveRequest"
        />
        <div v-else class="editor-placeholder">{{ t('fileManager.selectFileToEdit') }}</div>
      </div>

  </div>
</template>

<style scoped>
/* 样式与 FileEditorOverlay 类似，但移除 backdrop 和 popup 结构 */
.file-editor-container {
  width: 100%;
  height: 100%; /* 填充父级 Pane */
  background-color: #2d2d2d; /* 编辑器背景 */
  display: flex;
  flex-direction: column;
  color: #f0f0f0;
  overflow: hidden; /* 重要：防止内容溢出 */
}

/* 标签栏区域 */
/* FileEditorTabs 组件自带样式 */

.editor-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.5rem 1rem;
  background-color: #333;
  border-bottom: 1px solid #555;
  font-size: 0.9em;
  flex-shrink: 0;
}
.editor-header-placeholder {
    justify-content: flex-start; /* 左对齐提示文本 */
    color: #888;
}

.modified-indicator {
    color: #ffeb3b;
    margin-left: 4px;
    font-weight: bold;
}

/* 编辑器内容区域 */
.editor-content-area {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    position: relative;
}

.editor-loading, .editor-error, .editor-placeholder {
  padding: 2rem;
  text-align: center;
  font-size: 1.1em;
  flex-grow: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #888;
}
.editor-error { color: #ff8a8a; }
.editor-placeholder { color: #666; }

.editor-actions {
    display: flex;
    align-items: center;
    gap: 0.8rem; /* 稍微减小间距以容纳下拉菜单 */
}

.save-btn {
    background-color: #4CAF50;
    color: white;
    border: none;
    padding: 0.4rem 0.8rem;
    cursor: pointer;
    border-radius: 3px;
    font-size: 0.9em;
}
.save-btn:disabled { background-color: #aaa; cursor: not-allowed; }
.save-btn:hover:not(:disabled) { background-color: #45a049; }

.save-status {
    font-size: 0.9em;
    padding: 0.2rem 0.5rem;
    border-radius: 3px;
    white-space: nowrap;
}
.save-status.saving { color: #888; }
.save-status.success { color: #4CAF50; background-color: #e8f5e9; }
.save-status.error { color: #f44336; background-color: #ffebee; }

.editor-instance {
  flex-grow: 1;
  min-height: 0;
}
</style>

<style scoped> /* Add new styles below existing scoped styles */
.encoding-select-wrapper {
  display: inline-block; /* 让 wrapper 包裹内容 */
  vertical-align: middle; /* 垂直居中对齐 */
}

.encoding-select {
  background-color: #444;
  color: #f0f0f0;
  border: 1px solid #666;
  padding: 0.3rem 0.5rem; /* 恢复内边距 */
  border-radius: 3px;
  font-size: 0.85em;
  cursor: pointer;
  outline: none;
  /* width: auto; */ /* JS will control width via style property */
  /* 移除 flex-shrink */
  /* 确保没有其他样式覆盖，例如内联样式或更高优先级的选择器 */
}

.encoding-select:hover {
  background-color: #555;
}

.encoding-select:focus {
  border-color: #888;
}

.encoding-select-placeholder {
    font-size: 0.85em;
    color: #888;
    padding: 0.3rem 0.5rem;
    display: inline-block;
    min-width: 80px; /* 与 select 大致对齐 */
    text-align: center;
}
</style>

