import { http } from '@/common/service/service.js'
import { ACCESS_TOKEN } from '@/common/util/constants.js'

/** 消息 tab 在 tabBar.list 中的下标 */
export const MSG_TAB_INDEX = 2

/** 是否未读：status === '0' */
export function isUnreadNotice(item) {
	return item && String(item.status) === '0'
}

/**
 * 设置消息 tab 角标（仅未读；已读不显示）
 * @param {number|string} count 未读数
 */
export function setMsgTabBadge(count) {
	const n = Number(count) || 0
	if (n > 0) {
		uni.setTabBarBadge({
			index: MSG_TAB_INDEX,
			text: n > 99 ? '99+' : String(n),
			fail: () => {}
		})
	} else {
		uni.removeTabBarBadge({
			index: MSG_TAB_INDEX,
			fail: () => {}
		})
		uni.hideTabBarRedDot({
			index: MSG_TAB_INDEX,
			fail: () => {}
		})
	}
}

/**
 * 从分类列表统计未读数（不含已读）
 */
function countUnreadFromList(list) {
	const unread = (list || []).filter(isUnreadNotice)
	if (!unread.length) return 0
	const hasCount = unread.some(
		(i) => i.unreadCount != null || i.unReadCount != null
	)
	if (hasCount) {
		return unread.reduce(
			(sum, i) => sum + Number(i.unreadCount || i.unReadCount || 0),
			0
		)
	}
	return unread.length
}

/**
 * 拉取未读消息数并更新消息 tab 角标（只统计没看过的）
 */
export function updateMsgTabBadge() {
	const token = uni.getStorageSync(ACCESS_TOKEN)
	if (!token) {
		setMsgTabBadge(0)
		return Promise.resolve(0)
	}
	// 先按未读拉分页，客户端再过滤一次，避免拿到已读/总数据
	return http
		.post('/localUserNotice/localUserNotice/getPageListNew', {
			pageNo: 1,
			pageSize: 200,
			userType: 1,
			status: '0'
		})
		.then((res) => {
			const result = (res.data && res.data.result) || {}
			const records = Array.isArray(result.records)
				? result.records
				: result.page && Array.isArray(result.page.records)
					? result.page.records
					: []
			const unreadRecords = records.filter(isUnreadNotice)
			// 若返回记录全是未读，且接口给了 total，可用 total；否则只用未读条数
			const allUnread =
				records.length > 0 && unreadRecords.length === records.length
			const apiTotal =
				result.total != null
					? result.total
					: result.page && result.page.total != null
						? result.page.total
						: null
			let count = unreadRecords.length
			if (allUnread && apiTotal != null && Number(apiTotal) >= count) {
				count = Number(apiTotal)
			}
			setMsgTabBadge(count)
			return count
		})
		.catch(() => {
			return http
				.get('/localUserNotice/localUserNotice/getListNew', {
					params: { userType: 1 }
				})
				.then((res) => {
					const count = countUnreadFromList(
						(res.data && res.data.result) || []
					)
					setMsgTabBadge(count)
					return count
				})
				.catch(() => {
					setMsgTabBadge(0)
					return 0
				})
		})
}