<template>
  <div class="step3-container">
    <div class="main-row">
      <div class="right-content">
        <!-- 商品参数选择页面内容 -->
        <div class="step">
          <div class="step-left">
            <div class="step-title">
              车型:{{
                selectedCarTypeProxy === "其他" ? "其他" : selectedCarTypeProxy
              }}
              <div
                v-if="selectedCarTypeProxy === '其他'"
                class="reference-model"
              >
                参考车型：{{ referenceCarType || "未选择" }}
              </div>
            </div>
          </div>
          <div class="image-box right-align">
            <img src="/images/3D.png" alt="3D结构图" class="main-img" />
          </div>
        </div>
        <div class="table-title">商品参数选择</div>
        <!-- 只展示步骤二选中的编号和名称 -->
        <div class="header-title" v-if="form.selectedPartInfo">
          <div class="header-code">编号：{{ form.selectedPartInfo.code }}</div>
          <div class="header-name">名称：{{ form.selectedPartInfo.label }}</div>
        </div>
        <!-- 原有商品参数选择区保持不变 -->
        <div class="tree-table-row">
          <!-- 二级菜单作为tab页 -->
          <div class="tab-container">
            <el-tabs v-model="activeTab" @tab-click="handleTabClick">
              <el-tab-pane
                v-for="item in secondLevelItems"
                :key="item.code"
                :name="item.code"
              >
                <template #label>
                  <div class="custom-tab-label">
                    <div class="tab-label-image">
                      <img
                        :src="item.image || '/images/part-default.png'"
                        class="tab-img"
                      />
                    </div>
                    <div class="tab-label-info">
                      <div class="tab-label-code">{{ item.code }}</div>
                      <div class="tab-label-name">{{ item.label }}</div>
                    </div>
                  </div>
                </template>
                <!-- 三级及以下树形结构 -->
                <div
                  v-if="
                    activeSecondLevelItem &&
                    activeSecondLevelItem.children &&
                    activeSecondLevelItem.children.length
                  "
                  class="tab-content tab-content-flex"
                >
                  <div class="tab-left">
                    <el-collapse v-model="collapseActiveNames" accordion>
                      <el-collapse-item
                        v-for="thirdLevel in activeSecondLevelItem.children"
                        :key="thirdLevel.code"
                        :name="thirdLevel.code"
                        :disabled="
                          !thirdLevel.children ||
                          thirdLevel.children.length === 0
                        "
                      >
                        <template #title>
                          <span
                            :class="[
                              'tree-node',
                              selectedNode &&
                              selectedNode.code === thirdLevel.code
                                ? 'active'
                                : '',
                            ]"
                            @click.stop="handleNodeClick(thirdLevel)"
                          >
                            {{ thirdLevel.label }}
                            <el-button
                              v-if="thirdLevel.replaceable"
                              type="primary"
                              link
                              @click.stop="openReplaceDialog(thirdLevel)"
                              >替换</el-button
                            >
                          </span>
                        </template>
                        <ul
                          v-if="
                            thirdLevel.children &&
                            thirdLevel.children.length > 0
                          "
                        >
                          <li
                            v-for="fourthLevel in thirdLevel.children"
                            :key="fourthLevel.code"
                            :class="[
                              'tree-node',
                              selectedNode &&
                              selectedNode.code === fourthLevel.code
                                ? 'active'
                                : '',
                            ]"
                            @click="handleNodeClick(fourthLevel)"
                          >
                            <span>{{ fourthLevel.label }}</span>
                            <el-button
                              v-if="fourthLevel.replaceable"
                              type="primary"
                              link
                              @click.stop="openReplaceDialog(fourthLevel)"
                              >替换</el-button
                            >
                          </li>
                        </ul>
                      </el-collapse-item>
                    </el-collapse>
                  </div>
                  <div class="tab-right" v-if="selectedNode">
                    <img
                      :src="selectedNode.image"
                      class="detail-img"
                      v-if="selectedNode.image"
                    />
                    <div class="detail-info">
                      <div>编号：{{ selectedNode.code }}</div>
                      <div>名称：{{ selectedNode.label }}</div>
                      <el-button
                        v-if="selectedNode.replaceable"
                        type="primary"
                        class="right-button"
                        @click="openReplaceDialog(selectedNode)"
                        >替换</el-button
                      >
                    </div>
                  </div>
                  <div class="tab-right" v-else>
                    <span>请选择左侧商品</span>
                  </div>
                </div>
                <div v-else class="tab-content no-data">暂无数据</div>
              </el-tab-pane>
            </el-tabs>
          </div>
        </div>
        <el-dialog
          v-model="replaceDialogVisible"
          title="特定替换部件"
          width="500px"
        >
          <div class="replace-list">
            <div
              v-for="item in replaceList"
              :key="item.code"
              class="replace-item"
              :class="{ selected: replaceSelected === item.code }"
              @click="replaceSelected = item.code"
            >
              <img :src="item.image" class="replace-img" v-if="item.image" />
              <div>
                <div>编号：{{ item.code }}</div>
                <div>名称：{{ item.label }}</div>
              </div>
            </div>
          </div>
          <template #footer>
            <el-button @click="replaceDialogVisible = false">取消</el-button>
            <el-button type="primary" @click="handleReplace">替换</el-button>
          </template>
        </el-dialog>
        <div class="btn-row">
          <el-button @click="emit('prev-step')">上一步</el-button>
          <el-button type="primary" @click="emit('next-step')"
            >下一步</el-button
          >
        </div>
      </div>
    </div>
  </div>
</template>

<script setup>
import { ref, computed, watch, onMounted } from "vue";
import {
  carTypeOptions,
  productTreeData,
  replacePartsMap,
} from "@/data/stepMockData";

const props = defineProps({
  form: Object,
  selectedCarType: String,
});
const emit = defineEmits(["update:form", "prev-step", "next-step"]);

const referenceCarType = ref("");
const selectedCarTypeProxy = computed({
  get() {
    return props.form?.selectedCarType ?? "其他";
  },
  set(val) {
    if (props.form) {
      props.form.selectedCarType = val;
      emit("update:form", props.form);
    }
  },
});

// 商品参数选择相关逻辑
const treeData = ref(productTreeData);
const selectedNode = ref(null);
const replaceDialogVisible = ref(false);
const replaceList = ref([]);
const replaceSelected = ref(null);
const activeTab = ref("");
const collapseActiveNames = ref([]);

// 计算一级菜单项
const firstLevelItems = computed(() => treeData.value);
// 计算二级菜单项（只取第一个一级菜单的 children 作为 tab）
const secondLevelItems = computed(() => {
  return treeData.value.length > 0 ? treeData.value[0].children || [] : [];
});
// 当前激活的二级菜单项
const activeSecondLevelItem = computed(() => {
  return secondLevelItems.value.find((item) => item.code === activeTab.value);
});
// 处理tab切换
function handleTabClick(tab) {
  activeTab.value = tab.props.name;
  selectedNode.value = null;
}
// 处理节点点击
function handleNodeClick(node) {
  selectedNode.value = node;
}
// 打开替换对话框
function openReplaceDialog(node) {
  replaceList.value = replacePartsMap[node.code] || [];
  replaceSelected.value = null;
  replaceDialogVisible.value = true;
}
// 处理替换
function handleReplace() {
  if (!replaceSelected.value) return;
  const newPart = replaceList.value.find(
    (item) => item.code === replaceSelected.value
  );
  if (newPart) {
    selectedNode.value.code = newPart.code;
    selectedNode.value.label = newPart.label;
    selectedNode.value.image = newPart.image;
  }
  replaceDialogVisible.value = false;
}
const treeProps = {
  label: "label",
  children: "children",
};
function selectFirstNode() {
  const thirdLevels = activeSecondLevelItem.value?.children || [];
  if (thirdLevels.length > 0) {
    // 默认选择第一个节点
    selectedNode.value = thirdLevels[0];
    // 如果第一个节点有子节点，则展开并选择第一个子节点
    if (thirdLevels[0].children && thirdLevels[0].children.length > 0) {
      collapseActiveNames.value = [thirdLevels[0].code];
      selectedNode.value = thirdLevels[0].children[0];
    } else {
      collapseActiveNames.value = [];
    }
  } else {
    selectedNode.value = null;
    collapseActiveNames.value = [];
  }
}
onMounted(() => {
  if (secondLevelItems.value.length > 0) {
    activeTab.value = secondLevelItems.value[0].code;
  }
  selectFirstNode();
});
watch(secondLevelItems, (newVal) => {
  if (newVal.length > 0) {
    activeTab.value = newVal[0].code;
  }
  selectFirstNode();
});
watch(activeTab, () => {
  selectFirstNode();
});
</script>

<style scoped lang="scss">
.step3-container {
  background: #fff;
  padding: 24px;
  border-radius: 8px;
}
.main-row {
  display: flex;
  align-items: flex-start;
}
.right-content {
  flex: 1;
}
.step {
  display: flex;
  justify-content: space-between;
  margin-bottom: 20px;
}
.step-left {
  flex: 1;
  margin-right: 10px;
}
.step-title {
  font-size: 18px;
  margin: 15px 0;
  color: #333;
  font-weight: 500;

  &.active {
    color: #2156f3;
  }

  .reference-model {
    font-size: 14px;
    color: #666;
    margin-top: 8px;
    padding-left: 20px;
    position: relative;

    &::before {
      content: "";
      position: absolute;
      left: 0;
      top: 50%;
      transform: translateY(-50%);
      width: 12px;
      height: 12px;
      background: #2156f3;
      border-radius: 50%;
    }
  }
}
.image-box.right-align {
  display: flex;
  justify-content: flex-end;
  align-items: flex-start;
  margin-bottom: 16px;
}
.table-title {
  font-weight: bold;
  margin: 16px 0 8px 0;
  color: #333;
}
.tree-table-row {
  display: flex;
  flex-direction: column;
  border: 1px solid #bbb;
  border-radius: 4px;
  padding: 12px;
  background: #fff;
}
.header-title {
  flex: 1;
  padding: 10px;
  border-radius: 4px;
}
.header-code,
.header-name {
  font-size: 14px;
  color: #333;
  margin-bottom: 5px;
}
.tab-container {
  width: 100%;
}
.tab-header {
  background: #f5f7fa;
  border-radius: 4px;
  padding: 16px;
  margin-bottom: 20px;
}
.tab-header-item {
  display: flex;
  gap: 20px;
  align-items: center;
}
.tab-header-image {
  width: 200px;
  height: 150px;
  flex-shrink: 0;
}
.tab-header-info {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.tab-header-code,
.tab-header-name {
  font-size: 14px;
  color: #333;
  line-height: 1.5;
}
.part-img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  border-radius: 4px;
  border: 1px solid #eee;
}
.model-form {
  max-width: 900px;
  margin-top: 16px;
}
.btn-row {
  display: flex;
  justify-content: flex-end;
  gap: 16px;
  margin-top: 20px;
}
.main-img {
  width: 580px;
  height: 260px;
  object-fit: contain;
  border-radius: 8px;
  border: 1px solid #eee;
}
.custom-tab-label {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 8px 0;
}

.tab-label-image {
  width: 80px;
  height: 60px;
  margin-bottom: 8px;
}

.tab-img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  border-radius: 4px;
  border: 1px solid #eee;
}

.tab-label-info {
  text-align: center;
}

.tab-label-code {
  font-size: 12px;
  color: #666;
  margin-bottom: 4px;
}

.tab-label-name {
  font-size: 14px;
  color: #333;
  font-weight: 500;
}

:deep(.el-tabs__item) {
  height: auto !important;
  padding: 0 20px !important;
}

:deep(.el-tabs__nav) {
  display: flex;
  gap: 20px;
}

:deep(.el-tabs__item.is-active) {
  .tab-label-code,
  .tab-label-name {
    color: var(--el-color-primary);
  }
}

.tree-node {
  transition: background 0.2s;
  padding: 8px 12px;
  cursor: pointer;
  border-radius: 4px;
  margin-bottom: 4px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.tree-node.active {
  color: #2156f3;
}
.tree-node:hover {
  color: #2156f3;
}
.tab-content-flex {
  display: flex;
  min-height: 300px;
  height: 400px;
  max-height: 400px;
  overflow: hidden;
}
.tab-left {
  width: 260px;
  border-right: 1px solid #eee;
  padding-right: 16px;
  overflow-y: auto;
  height: 100%;
}
.tab-right {
  flex: 1;
  padding-left: 24px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  overflow-y: auto;
  height: 100%;
}
.right-button {
  margin: 15px 0 0 260px;
}
.detail-img {
  width: 180px;
  height: 120px;
  object-fit: contain;
  border: 1px solid #eee;
  border-radius: 4px;
  margin-bottom: 16px;
}
.replace-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.replace-item {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 8px;
  border: 1px solid #eee;
  border-radius: 4px;
  cursor: pointer;
}
.replace-item.selected {
  border-color: #2156f3;
}
.replace-img {
  width: 80px;
  height: 60px;
  object-fit: contain;
  border-radius: 4px;
  border: 1px solid #eee;
}
.no-data {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 300px;
  color: #999;
  font-size: 18px;
}

// 新增样式
:deep(.el-collapse-item.is-disabled .el-collapse-item__header) {
  cursor: default;
  color: #303133;
  &:hover {
    background-color: transparent;
  }
}

:deep(.el-collapse-item.is-disabled .el-collapse-item__arrow) {
  display: none;
}

:deep(.el-collapse-item__header) {
  padding: 0;
  height: auto;
}

:deep(.el-collapse-item__content) {
  padding: 0;
  padding-left: 16px;
}

:deep(.el-collapse-item__wrap) {
  border-bottom: none;
}

.search-row {
  display: flex;
  align-items: center;
  margin-bottom: 8px;
}
.search-label {
  font-size: 15px;
  color: #666;
  margin-right: 8px;
}
.car-type-text-list {
  display: flex;
  gap: 32px;
}
.car-type-text {
  font-size: 16px;
  color: #333;
  cursor: pointer;
  padding: 0 4px 4px 4px;
  border-bottom: 2px solid transparent;
  transition: color 0.2s, border 0.2s;
}
.car-type-text.active {
  color: #2156f3;
  border-bottom: 2px solid #2156f3;
  font-weight: 500;
}
.search-divider {
  border-bottom: 1px dashed #e5e5e5;
  margin: 8px 0 16px 0;
}
.param-group-title {
  font-size: 15px;
  color: #333;
  font-weight: 600;
  margin: 12px 0 12px 0;
}
.param-form-row {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  gap: 24px 32px;
  margin-bottom: 0;
  position: relative;
}
.param-form-item {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 0;
}
.param-label {
  font-size: 14px;
  color: #666;
  min-width: 60px;
  text-align: right;
}
.param-input {
  width: 120px;
}
.param-form-btns {
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 12px;
  margin-left: auto;
  min-width: 200px;
}
.param-btn {
  min-width: 90px;
}
.result-card-list {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  margin-top: 24px;
}
.result-card {
  width: 220px;
  position: relative;
  padding-top: 16px;
  box-sizing: border-box;
}
.result-card-checkbox-wrap {
  position: absolute;
  left: 20px;
  top: 22px;
  z-index: 2;
}
.result-card-checkbox {
  position: static;
}
.result-card-img {
  width: 100%;
  height: 120px;
  object-fit: contain;
  border-radius: 4px;
  border: 1px solid #eee;
  margin-bottom: 12px;
}
.result-card-info {
  text-align: left;
}
.result-card-name {
  font-size: 15px;
  color: #333;
  font-weight: 500;
  margin-bottom: 4px;
}
.result-card-code {
  font-size: 13px;
  color: #888;
}
.compare-dialog-cards {
  display: flex;
  gap: 32px;
  margin-bottom: 24px;
}
.compare-card {
  width: 220px;
  text-align: center;
  box-sizing: border-box;
}
.compare-card-img {
  width: 100%;
  height: 120px;
  object-fit: contain;
  border-radius: 4px;
  border: 1px solid #eee;
  margin-bottom: 12px;
}
.compare-card-info {
  text-align: center;
}
.compare-card-name {
  font-size: 15px;
  color: #333;
  font-weight: 500;
  margin-bottom: 4px;
}
.compare-card-code {
  font-size: 13px;
  color: #888;
}
.compare-table-wrap {
  margin-top: 16px;
}
</style>
