<template>
  <el-aside :width="width" class="common-aside">
    <!-- 加载状态 -->
    <div v-if="loading" class="loading-spinner">
      <i class="el-icon-loading" style="font-size: 24px; color: #fff"></i>
    </div>

    <!-- 错误提示 -->
    <div v-else-if="hasError" class="error-container">
      <el-icon class="error-icon"><Warning /></el-icon>
      <div class="error-text">{{ errorMsg }}</div>
      <el-button size="small" @click="fetchMenus">重新加载</el-button>
    </div>

    <!-- 菜单主体 -->
    <el-menu
      v-else
      :collapse="isCollapse"
      :collapse-transition="false"
      :background-color="asideBgColor"
      :text-color="asideTextColor"
      :active-text-color="activeColor"
      :active-background-color="activeBgColor"
      class="el-menu-vertical-demo"
      :unique-opened="true"
      @select="handleMenuSelect"
      :default-active="route.path"
    >
      <!-- 菜单标题 -->
      <h3>{{ isCollapse ? "管理" : asideTitle }}</h3>

      <!-- 无模块时显示提示 -->
      <el-menu-item v-if="!currentModule" index="/home">
        <i class="fa-solid fa-house"></i>
        <template #title>返回首页</template>
      </el-menu-item>

      <!-- 动态菜单项 -->
      <template v-for="item in displayMenus" :key="item.id">
        <!-- 如果没有子菜单，渲染为菜单项 -->
        <el-menu-item
          v-if="!item.children || item.children.length === 0"
          :index="item.path || item.id.toString()"
        >
          <i v-if="item.icon" :class="item.icon" class="menu-icon"></i>
          <template #title>
            <span>{{ item.title }}</span>
          </template>
        </el-menu-item>

        <!-- 如果有子菜单，渲染为子菜单 -->
        <el-sub-menu
          v-else
          :index="item.path || item.id.toString()"
          :unique-opened="true"
        >
          <template #title>
            <i v-if="item.icon" :class="item.icon" class="menu-icon"></i>
            <span>{{ item.title }}</span>
          </template>

          <!-- 递归渲染子菜单 -->
          <template v-for="child in item.children" :key="child.id">
            <el-menu-item
              v-if="!child.children || child.children.length === 0"
              :index="child.path || child.id.toString()"
            >
              <i v-if="child.icon" :class="child.icon" class="menu-icon"></i>
              <template #title>
                <span>{{ child.title }}</span>
              </template>
            </el-menu-item>

            <el-sub-menu
              v-else
              :index="child.path || child.id.toString()"
              :unique-opened="true"
            >
              <template #title>
                <i v-if="child.icon" :class="child.icon" class="menu-icon"></i>
                <span>{{ child.title }}</span>
              </template>

              <!-- 继续递归渲染子菜单 -->
              <template
                v-for="grandchild in child.children"
                :key="grandchild.id"
              >
                <el-menu-item
                  v-if="
                    !grandchild.children || grandchild.children.length === 0
                  "
                  :index="grandchild.path || grandchild.id.toString()"
                >
                  <i
                    v-if="grandchild.icon"
                    :class="grandchild.icon"
                    class="menu-icon"
                  ></i>
                  <template #title>
                    <span>{{ grandchild.title }}</span>
                  </template>
                </el-menu-item>

                <el-sub-menu
                  v-else
                  :index="grandchild.path || grandchild.id.toString()"
                  :unique-opened="true"
                >
                  <template #title>
                    <i
                      v-if="grandchild.icon"
                      :class="grandchild.icon"
                      class="menu-icon"
                    ></i>
                    <span>{{ grandchild.title }}</span>
                  </template>

                  <!-- 继续递归渲染... -->
                  <template
                    v-for="greatGrandchild in grandchild.children"
                    :key="greatGrandchild.id"
                  >
                    <el-menu-item
                      :index="
                        greatGrandchild.path || greatGrandchild.id.toString()
                      "
                    >
                      <i
                        v-if="greatGrandchild.icon"
                        :class="greatGrandchild.icon"
                        class="menu-icon"
                      ></i>
                      <template #title>
                        <span>{{ greatGrandchild.title }}</span>
                      </template>
                    </el-menu-item>
                  </template>
                </el-sub-menu>
              </template>
            </el-sub-menu>
          </template>
        </el-sub-menu>
      </template>
    </el-menu>
  </el-aside>
</template>

<script setup>
import { ref, computed, onMounted, onUnmounted, watch } from "vue";
import { useRouter, useRoute } from "vue-router";
import { Document, Warning } from "@element-plus/icons-vue";
import { useAllDataStore, useMenuStore } from "@/stores";

const emit = defineEmits(["menu-click"]);

const router = useRouter();
const route = useRoute();
const menuStore = useMenuStore();
const loading = computed(() => menuStore.loading);
const hasError = computed(() => menuStore.error);
const errorMsg = computed(() => menuStore.error || "加载菜单失败");

const store = useAllDataStore();
const isCollapse = computed(() => store.state.isCollapse);
const width = computed(() => (store.state.isCollapse ? "64px" : "200px"));

const asideBgColor = ref("#304156");
const asideTextColor = ref("#bfcbd9");
const activeColor = ref("#3973FF");
const activeBgColor = ref("#3973FF");

const currentModuleId = ref(null);

const findMenuItem = (menus, targetIndex) => {
  for (const menu of menus) {
    if (menu.path === targetIndex) {
      return menu;
    }
    if (menu.children && menu.children.length > 0) {
      const found = findMenuItem(menu.children, targetIndex);
      if (found) return found;
    }
  }
  return null;
};

const findParentModule = (menus, currentPath) => {
  for (const menu of menus) {
    if (!menu.path || menu.path === "/home") {
      if (menu.children && menu.children.length > 0) {
        const found = findParentModule(menu.children, currentPath);
        if (found) return found;
      }
      continue;
    }

    if (currentPath === menu.path || currentPath.startsWith(menu.path + "/")) {
      return menu;
    }

    if (menu.children && menu.children.length > 0) {
      for (const child of menu.children) {
        if (!child.path) continue;

        if (
          currentPath === child.path ||
          currentPath.startsWith(child.path + "/")
        ) {
          return menu;
        }

        if (child.children && child.children.length > 0) {
          for (const grandchild of child.children) {
            if (!grandchild.path) continue;
            if (
              currentPath === grandchild.path ||
              currentPath.startsWith(grandchild.path + "/")
            ) {
              return menu;
            }
          }
        }
      }
    }
  }

  return null;
};

const findCurrentMenu = findParentModule;

const currentModule = computed(() => {
  const path = route.path;
  if (path === "/home") {
    currentModuleId.value = null;
    return null;
  }

  const menu = findCurrentMenu(list.value, path);
  if (menu) {
    currentModuleId.value = menu.id;
  }
  return menu;
});

const displayMenus = computed(() => {
  if (!currentModule.value) {
    return [];
  }

  const currentPath = route.path;
  // 访问“父级 index 页面”时不展开子菜单；只有进入“子页面”后才展示 children。
  // 例如：/apps/cms/products（父级）时不展示其 children（如 /apps/cms/products/types）。
  if (currentPath === currentModule.value.path) {
    return [];
  }

  return currentModule.value.children || [];
});

const asideTitle = computed(() => {
  if (isCollapse.value) return "管理";
  if (!currentModule.value) return "子菜单";
  return displayMenus.value.length > 0 ? (currentModule.value.title || "子菜单") : "子菜单";
});

const processMenus = (menus) => {
  return menus
    .filter((menu) => {
      // is_visible 控制“侧边栏是否展示”，不参与动态路由与缓存层面的过滤
      if (menu.is_visible !== undefined && Number(menu.is_visible) === 0) {
        return false;
      }
      if (menu.path && menu.path.trim() !== "") return true;
      if (menu.children && menu.children.length > 0) return true;
      return false;
    })
    .map((menu) => ({
      id: menu.id,
      path: menu.path,
      icon: menu.icon || "Document",
      title: menu.title,
      route: menu.path,
      component_path: menu.component_path,
      parentId: menu.pid || 0,
      order: menu.sort || 0,
      children: menu.children ? processMenus(menu.children) : [],
    }));
};

const list = computed(() => {
  const menuData = menuStore.menus;
  if (!menuData || menuData.length === 0) {
    return [];
  }

  const allMenus = processMenus(menuData);

  const sortMenusRecursively = (menus) => {
    menus.forEach((menu) => {
      if (menu.children && menu.children.length > 0) {
        menu.children.sort((a, b) => {
          const orderA = Number(a.order) ?? 999999;
          const orderB = Number(b.order) ?? 999999;
          if (orderA === orderB) {
            return (a.id || 0) - (b.id || 0);
          }
          return orderA - orderB;
        });
        sortMenusRecursively(menu.children);
      }
    });
  };

  sortMenusRecursively(allMenus);

  return allMenus;
});

const handleMenuSelect = (index) => {
  if (index === "/home") {
    emit("menu-click", {
      path: "/home",
      title: "首页",
      icon: "fa-solid fa-house",
      component_path: "/home",
    });
    return;
  }

  const menuItem = findMenuItem(list.value, index);
  if (menuItem) {
    emit("menu-click", menuItem);
  }
};

const fetchMenus = async () => {
  try {
    await menuStore.fetchMenus();
  } catch (error) {}
};

const handleMenuRefresh = () => {
  fetchMenus();
};

watch(
  () => route.path,
  () => {
    findCurrentMenu(list.value, route.path);
  },
  { immediate: true },
);

onMounted(() => {
  if (!menuStore.menus || menuStore.menus.length === 0) {
    setTimeout(() => {
      fetchMenus();
    }, 100);
  }

  window.addEventListener("menu-cache-refreshed", handleMenuRefresh);
});

onUnmounted(() => {
  window.removeEventListener("menu-cache-refreshed", handleMenuRefresh);
});
</script>

<style scoped lang="less">
.common-aside {
  height: 100%;
  transition:
    width 0.3s cubic-bezier(0.4, 0, 0.2, 1),
    background-color 0.3s ease;
  overflow: hidden;
  position: relative;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  box-shadow: 2px 0 8px rgba(0, 0, 0, 0.1);

  html:not(.dark) & {
    background: #3973ff;
    box-shadow: 2px 0 12px rgba(6, 45, 163, 0.3);
  }

  html.dark & {
    background: linear-gradient(135deg, #1a1a1a 0%, #2d2d2d 100%);
    box-shadow: 2px 0 8px rgba(0, 0, 0, 0.3);
  }
}

.loading-spinner {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100%;

  i {
    font-size: 28px;
    color: rgba(255, 255, 255, 0.8);
    animation: spin 1s linear infinite;
  }

  @keyframes spin {
    0% {
      transform: rotate(0deg);
    }
    100% {
      transform: rotate(360deg);
    }
  }
}

h3 {
  line-height: 60px;
  text-align: center;
  font-size: 18px;
  font-weight: 600;
  color: rgba(255, 255, 255, 0.95);
  margin: 0;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
  position: relative;
}

// 菜单样式
:deep(.el-menu) {
  border-right: none;
  height: calc(100% - 80px);
  padding: 16px 8px;
  background: transparent;

  .el-menu-item,
  .el-sub-menu__title {
    color: rgba(255, 255, 255, 0.85);
    transition: all 0.3s ease;
    border-radius: 8px;
    margin: 2px 0;
    font-size: 14px;
    font-weight: 500;
    position: relative;

    html:not(.dark) & {
      color: rgba(255, 255, 255, 0.85);
    }

    html.dark & {
      color: var(--el-text-color-primary);
    }

    .menu-icon {
      margin-right: 8px;
      font-size: 16px;
    }
  }

  // 高亮样式
  .el-menu-item.is-active {
    html:not(.dark) & {
      background-color: rgba(57, 115, 255, 0.3) !important;
    }
    html.dark & {
      background-color: rgba(60, 60, 60, 0.8) !important;
    }
    color: #ffffff !important;
    /* border-left: 3px solid #4f84ff; */
    margin-left: -3px;

    .menu-icon {
      color: #fff;
    }
  }

  // 悬浮样式
  .el-menu-item:hover:not(.is-active),
  .el-sub-menu__title:hover {
    html:not(.dark) & {
      background-color: rgba(255, 255, 255, 0.1) !important;
    }
    html.dark & {
      background-color: rgba(60, 60, 60, 0.8) !important;
    }
    color: #ffffff !important;
  }

  // 子菜单样式
  .el-sub-menu {
    .el-sub-menu__title {
      position: relative;
    }

    &.is-opened .el-sub-menu__title {
      background: rgba(255, 255, 255, 0.08) !important;
    }

    .el-menu-item {
      padding-left: 48px !important;
      font-size: 13px;
    }
  }

  // 暗色主题适配
  html.dark & {
    .el-menu-item.is-active {
      background: rgba(219, 148, 148, 0.8) !important;
      color: var(--el-color-primary-light-3) !important;
      /* border-left-color: var(--el-color-primary); */

      .menu-icon {
        color: var(--el-color-primary);
      }
    }

    .el-menu-item:hover:not(.is-active),
    .el-sub-menu__title:hover {
      background: rgba(255, 255, 255, 0.08) !important;
      color: var(--el-color-primary-light-3) !important;
    }

    .el-sub-menu.is-opened .el-sub-menu__title {
      background: rgba(64, 158, 255, 0.08) !important;
    }
  }
}

// 响应式设计
@media (max-width: 768px) {
  .common-aside {
    width: 100% !important;
  }

  :deep(.el-menu) {
    padding: 12px 4px;
  }
}
</style>
