<template>
    <div class="w-full bg-gray-50 dark:bg-gray-900 min-h-screen mt-4">
        <!-- 响应式卡片网格 -->
        <!-- 
            这个div使用了Tailwind CSS的类来实现响应式的卡片网格布局：
            - grid：将容器设置为网格布局。
            - grid-cols-1：在小屏幕下每行显示1列。
            - sm:grid-cols-2：在中等屏幕（sm及以上）每行显示2列。
            - lg:grid-cols-3：在大屏幕（lg及以上）每行显示3列。
            - gap-4：网格项之间有统一的间距。
            - max-w-8xl：设置最大宽度为8xl，防止内容过宽。
            - mx-auto：左右自动外边距，使网格居中显示。
        -->
        <div class="grid grid-cols-1 xs:grid-cols-2 sm:grid-cols-2 md:grid-cols-3 lg:grid-cols-3 xl:grid-cols-3 2xl:grid-cols-4 gap-4 w-full mx-auto">
            <div v-for="item in firstLevelItems" :key="item.path"
                class="bg-white dark:bg-gray-800 rounded-lg border border-gray-200 dark:border-gray-700 p-5 sm:p-6 shadow-sm hover:shadow-md transition-all duration-200 cursor-pointer"
                @click="navigateTo(item.path)">
                
                <!-- 卡片头部 -->
                <div class="flex items-center justify-between mb-1">
                    <h2 class="font-sans text-xl sm:text-xl lg:text-2xl font-bold text-gray-900 dark:text-white leading-tight">
                        {{ item.title }}
                    </h2>
                    <span class="text-sm sm:text-base lg:text-lg text-gray-600 dark:text-gray-400 font-normal">
                        <span class="text-primary mr-0.3">{{ getChildrenCount(item) }}</span>篇
                    </span>
                </div>

                <!-- 子页面列表 -->
                <div v-if="getChildrenTitles(item).length > 0" class="">
                    <div v-for="(child, index) in getChildrenWithIcons(item).slice(0, 5)" :key="index"
                        class="flex items-center justify-between 
                        text-sm sm:text-base lg:text-lg text-gray-700 dark:text-gray-300
                         hover:text-blue-600 dark:hover:text-blue-400 
                         transition-colors duration-200 py-1
                         border-b border-gray-200 dark:border-gray-700 pt-2">
                         
                        <div class="flex items-center flex-1 min-w-0 pl-1 ">
                            <UIcon :name="(typeof child.icon === 'string' ? child.icon : 'lucide-file-text')" class="mr-2 text-gray-400" size="14" />
                            <span class="text-base font-medium font-sans">{{ child.title }}</span>
                        </div>
                        <UIcon name="lucide-chevron-right" class="text-gray-400 flex-shrink-0 ml-2" size="16" />
                    </div>
                </div>
            </div>
        </div>
    </div>
</template>

<script setup lang="ts">
import type { ContentNavigationItem } from "@nuxt/content";

const navigation = inject<Ref<ContentNavigationItem[]>>("navigation");

// 计算属性：提取第一级数据
const firstLevelItems = computed(() => {
    if (!navigation?.value) return [];
    return navigation.value
        .filter(item => item.title && item.path)
        .map(item => ({
            ...item,
            description: item.description,
            icon: item.icon || 'lucide-book-open'
        }));
});

// 获取子页面数量
const getChildrenCount = (item: ContentNavigationItem) => {
    return item.children?.length || 0;
};

// 获取子页面标题列表
const getChildrenTitles = (item: ContentNavigationItem) => {
    if (!item.children) return [];
    return item.children.map(child => child.title).filter(Boolean);
};

// 获取子页面数据（包含图标）
const getChildrenWithIcons = (item: ContentNavigationItem) => {
    if (!item.children) return [];
    return item.children.filter(child => child.title);
};

// 获取描述信息
const getDescription = (item: ContentNavigationItem) => {
    if (item.children && item.children.length > 0) {
        return `${item.children.length} 个子页面`;
    }
    return "文档页面";
};

// 导航方法
const navigateTo = (path: string) => {
    if (path) {
        window.location.href = path;
    }
};
</script>