import { generateId } from '@/api/request.js'
import { startOfDay, endOfDay } from '@/utils/date.js'

const STORAGE_KEY = 'app_schedules'

const PRIORITY = {
	low: { value: 'low', label: '低', color: '#909399' },
	medium: { value: 'medium', label: '中', color: '#3c9cff' },
	high: { value: 'high', label: '高', color: '#f56c6c' }
}

export const PRIORITY_OPTIONS = Object.values(PRIORITY)

export const REMIND_CHANNEL_OPTIONS = [
	{ value: 'sms', label: '短信' },
	{ value: 'email', label: '邮件' },
	{ value: 'bark', label: 'Bark推送' },
	{ value: 'site', label: '站内信' },
	{ value: 'app', label: 'APP' }
]

export const REMIND_MINUTES_OPTIONS = [
	{ label: '不提前', value: 0 },
	{ label: '提前 5 分钟', value: 5 },
	{ label: '提前 10 分钟', value: 10 },
	{ label: '提前 15 分钟', value: 15 },
	{ label: '提前 30 分钟', value: 30 },
	{ label: '提前 1 小时', value: 60 },
	{ label: '提前 2 小时', value: 120 },
	{ label: '提前 1 天', value: 1440 }
]

function readLocal() {
	const list = uni.getStorageSync(STORAGE_KEY) || []
	return list.map(normalizeSchedule)
}

function writeLocal(list) {
	uni.setStorageSync(STORAGE_KEY, list)
}

export function normalizeSchedule(item) {
	const content = (item.content || item.title || '').trim()
	const title = (item.title || content.split('\n')[0] || '无标题').trim().slice(0, 60)
	let remindChannels = item.remindChannels
	if (!Array.isArray(remindChannels)) {
		remindChannels = item.remindMinutes > 0 ? ['app'] : []
	}
	return {
		...item,
		title,
		content,
		remindChannels,
		remindMinutes: item.remindMinutes ?? 15
	}
}

function buildTitle(content) {
	const line = (content || '').split('\n')[0].trim()
	return line.slice(0, 60) || '无标题'
}

function seedIfEmpty() {
	const raw = uni.getStorageSync(STORAGE_KEY)
	if (raw && raw.length) return raw.map(normalizeSchedule)
	const now = Date.now()
	const today = new Date()
	const seeded = [
		{
			id: generateId(),
			content: '团队周会\n汇报本周进度，讨论下周计划',
			datetime: new Date(today.getFullYear(), today.getMonth(), today.getDate(), 10, 0).getTime(),
			remindChannels: ['app', 'site'],
			remindMinutes: 15,
			priority: 'high',
			completed: false,
			createdAt: now - 86400000,
			updatedAt: now - 86400000
		},
		{
			id: generateId(),
			content: '提交月报\n整理本月数据并发送给主管',
			datetime: new Date(today.getFullYear(), today.getMonth(), today.getDate() + 1, 18, 0).getTime(),
			remindChannels: ['email', 'site'],
			remindMinutes: 30,
			priority: 'medium',
			completed: false,
			createdAt: now - 43200000,
			updatedAt: now - 43200000
		},
		{
			id: generateId(),
			content: '健身打卡\n有氧运动 30 分钟',
			datetime: new Date(today.getFullYear(), today.getMonth(), today.getDate() - 1, 19, 30).getTime(),
			remindChannels: ['bark', 'app'],
			remindMinutes: 10,
			priority: 'low',
			completed: true,
			createdAt: now - 259200000,
			updatedAt: now - 86400000
		}
	].map(normalizeSchedule)
	writeLocal(seeded)
	return seeded
}

function sortSchedules(list) {
	return [...list].sort((a, b) => {
		if (a.completed !== b.completed) return a.completed ? 1 : -1
		return (a.datetime || 0) - (b.datetime || 0)
	})
}

/**
 * 获取日程列表
 */
export async function fetchSchedules(params = {}) {
	// TODO: return request({ url: '/api/schedules', data: params })
	let list = seedIfEmpty()
	const keyword = (params.keyword || '').trim().toLowerCase()
	const status = params.status || 'all'

	if (keyword) {
		list = list.filter(item => {
			const text = `${item.title} ${item.content}`.toLowerCase()
			return text.includes(keyword)
		})
	}
	if (status === 'pending') list = list.filter(item => !item.completed)
	if (status === 'done') list = list.filter(item => item.completed)

	if (params.date) {
		const dayStart = startOfDay(params.date).getTime()
		const dayEnd = endOfDay(params.date).getTime()
		list = list.filter(item => item.datetime >= dayStart && item.datetime <= dayEnd)
	}

	list = sortSchedules(list)
	return { list, total: list.length }
}

/**
 * 获取单条日程
 */
export async function getSchedule(id) {
	// TODO: return request({ url: `/api/schedules/${id}` })
	const list = readLocal()
	const item = list.find(entry => entry.id === id)
	return item ? normalizeSchedule(item) : null
}

/**
 * 创建日程
 * @param {{ content: string, datetime: number, remindChannels?: string[], remindMinutes?: number }} data
 */
export async function createSchedule(data) {
	// TODO: return request({ url: '/api/schedules', method: 'POST', data })
	const now = Date.now()
	const content = (data.content || '').trim()
	const schedule = normalizeSchedule({
		id: generateId(),
		title: buildTitle(content),
		content,
		datetime: data.datetime,
		remindChannels: data.remindChannels || [],
		remindMinutes: data.remindMinutes ?? 15,
		priority: data.priority || 'medium',
		completed: false,
		createdAt: now,
		updatedAt: now
	})
	const list = readLocal()
	list.push(schedule)
	writeLocal(list)
	return schedule
}

/**
 * 更新日程
 */
export async function updateSchedule(id, data) {
	// TODO: return request({ url: `/api/schedules/${id}`, method: 'PUT', data })
	const list = readLocal()
	const index = list.findIndex(item => item.id === id)
	if (index === -1) throw new Error('日程不存在')

	const prev = list[index]
	const content = data.content !== undefined ? data.content.trim() : prev.content
	const schedule = normalizeSchedule({
		...prev,
		...data,
		title: data.content !== undefined ? buildTitle(content) : prev.title,
		content,
		updatedAt: Date.now()
	})
	list[index] = schedule
	writeLocal(list)
	return schedule
}

/**
 * 删除日程
 */
export async function deleteSchedule(id) {
	// TODO: return request({ url: `/api/schedules/${id}`, method: 'DELETE' })
	const list = readLocal().filter(item => item.id !== id)
	writeLocal(list)
	return true
}

/**
 * 切换完成状态
 */
export async function toggleScheduleComplete(id) {
	const item = await getSchedule(id)
	if (!item) throw new Error('日程不存在')
	return updateSchedule(id, { completed: !item.completed })
}

export function getPriorityMeta(value) {
	return PRIORITY[value] || PRIORITY.medium
}

export function getRemindChannelLabel(value) {
	return REMIND_CHANNEL_OPTIONS.find(item => item.value === value)?.label || value
}

export function getRemindChannelLabels(channels = []) {
	if (!channels.length) return '未设置'
	return channels.map(getRemindChannelLabel).join('、')
}

export function getRemindMinutesLabel(minutes) {
	const item = REMIND_MINUTES_OPTIONS.find(option => option.value === minutes)
	return item?.label || (minutes ? `提前 ${minutes} 分钟` : '不提前')
}

export function getScheduleSummary(item) {
	const text = (item?.content || item?.title || '').trim()
	const line = text.split('\n')[0]
	return line || '无内容'
}