export const LOADING_SHOW_EVENT = 'common-loading:show'
export const LOADING_HIDE_EVENT = 'common-loading:hide'

const defaultOptions = {
	title: '加载中...',
	mask: true
}

const loadingState = {
	visible: false,
	title: defaultOptions.title,
	mask: defaultOptions.mask
}

let installed = false
let nativeShowLoading = null
let nativeHideLoading = null

function normalizeOptions(options = {}) {
	if (typeof options === 'string') {
		return {
			...defaultOptions,
			title: options
		}
	}

	return {
		...defaultOptions,
		...options,
		title: options.title || defaultOptions.title,
		mask: options.mask !== false
	}
}

export function getLoadingState() {
	return {
		...loadingState
	}
}

export function showLoading(options) {
	const loadingOptions = normalizeOptions(options)
	loadingState.visible = true
	loadingState.title = loadingOptions.title
	loadingState.mask = loadingOptions.mask
	uni.$emit(LOADING_SHOW_EVENT, loadingOptions)
	loadingOptions.success && loadingOptions.success({ errMsg: 'showLoading:ok' })
	loadingOptions.complete && loadingOptions.complete({ errMsg: 'showLoading:ok' })
}

export function hideLoading(options = {}) {
	loadingState.visible = false
	uni.$emit(LOADING_HIDE_EVENT)
	nativeHideLoading && nativeHideLoading.call(uni)
	options.success && options.success({ errMsg: 'hideLoading:ok' })
	options.complete && options.complete({ errMsg: 'hideLoading:ok' })
}

export function installLoading() {
	if (installed) {
		return
	}

	installed = true
	nativeShowLoading = uni.showLoading
	nativeHideLoading = uni.hideLoading
	uni.$nativeShowLoading = nativeShowLoading
	uni.$nativeHideLoading = nativeHideLoading
	uni.showLoading = showLoading
	uni.hideLoading = hideLoading
}

export default {
	installLoading,
	showLoading,
	hideLoading,
	getLoadingState
}