import { computed, defineComponent, ref, watch } from "vue"
import { usePage, useT } from "../../hooks"
import { useScroll } from "@vueuse/core"
import { List, Spin } from "ant-design-vue"
import "./index.less"

/**
 * 列表组件
 * @version 1.0.0
 */
export default defineComponent({
	name: "NewbieList",
	props: {
		/**
		 * 加载数据的URL
		 */
		url: { type: String, default: "" },

		/**
		 * 请求附带参数
		 */
		extraData: { type: Object, default: () => ({}) },

		/**
		 * 高度
		 */
		height: { type: Number, default: 300 },

		/**
		 * 加载触发距离，滚动条与底部距离小于 offset 时触发 load 事件
		 */
		offset: { type: Number, default: 50 },

		/**
		 * 加完完毕提示文案
		 */
		finishedText: { type: String, default: "" },

		/**
		 * 是否自动加载
		 */
		autoLoad: { type: Boolean, default: true },

		/**
		 * 是否使用 store
		 * 如果使用 store, 请确认 store 中定义了 pagination 和 initPagination 方法
		 */
		useStore: { type: Object, default: () => null },

		/**
		 * 原生 [List](https://www.antdv.com/components/list-cn#api) 参数
		 */
		listProps: { type: Object, default: () => ({}) },
	},

	setup(props, { slots, expose }) {
		const containerRef = ref(null)
		const listRef = ref(null)

		const combinedListProps = computed(() => {
			return {
				...props.listProps,
			}
		})

		let pagination
		if (props.useStore?.initPagination) {
			props.useStore.initPagination({
				uri: props.url,
				params: props.extraData,
			})
			pagination = computed(() => props.useStore.pagination)
		} else {
			pagination = ref({
				uri: props.url,
				params: props.extraData,
			})
		}

		const loadMore = (refresh) => {
			pagination.value = usePage(pagination.value, refresh)
		}

		const { y } = useScroll(containerRef)

		watch(y, async (value) => {
			if (value + props.height + props.offset >= containerRef.value.scrollHeight && !pagination.value.loading && !pagination.value.finished) {
				await loadMore()
			}
		})

		if (props.autoLoad) {
			loadMore()
		}

		/****************** exposed ******************/

		const items = () => {
			return pagination.value.items || []
		}

		expose({ loadMore, items, pagination })

		/****************** render ******************/

		return () => (
			<div ref={containerRef} class={"newbie-list"} style={{ height: `${props.height}px` }}>
				<List ref={listRef} dataSource={pagination.value?.items || []} {...combinedListProps.value}>
					{{
						default: () => slots.default?.(),
						renderItem: ({ item, index }) => (slots.renderItem ? slots.renderItem({ item, index }) : null),
						loadMore: () => {
							return [
								pagination.value?.loading ? (
									<div class={"loading-container"}>
										<Spin />
									</div>
								) : null,
								pagination.value?.finished ? (
									<div class={"finished-text"}>{props.finishedText || useT("common.loading-finished")}</div>
								) : null,
							]
						},
					}}
				</List>
			</div>
		)
	},
})