-- Edit By ChenGY
-- 记录玩家位置，距离计算

Location = {
	longitude = 0,
	latitude = 0,
	default = true,
	address = nil,
}

local M = Location

function M.new(str)
	local self = {}
	setmetatable(self, {__index = M})
	self:LoadLocation(str)
	if str and str ~= "" then
		self.default = false 
	else
		self.default = true
	end
	return self
end

-- 获取详细地址
function M:GetAddress(obj)
	if self.address then
		obj.text = self.address
	else
		coroutine.start(self.DownloadAddressInfo, self, obj)
	end
end

function M:DownloadAddressInfo(obj)
	-- bd09ll    gcj02   wgs84ll
	local coordtype = "&coordtype=wgs84ll"
	-- if Application.platform == RuntimePlatform.Android then
	-- 	coordtype = ""
	-- end
	local url = string.format("http://api.map.baidu.com/geocoder/v2/?ak=Z6qXIddQtwO8xaKunX4CURbwcV0GLSrG&location=%s,%s&output=json%s", self.latitude, self.longitude, coordtype)
	local www = UnityEngine.WWW(url)
	coroutine.www(www)
	if string.utf8len(www.error) == 0 then
		local txt = www.text
		local json_add = json.decode(txt)
		self.address = json_add.result.formatted_address
		obj.text = self.address
	end
end

-- 计算距离
function M:CalcDistance(loc)
	local EARTH_RADIUS = 6378.137

	local radLat1 = math.rad(self.latitude)
	local radLat2 = math.rad(loc.latitude)
	local a = radLat1 - radLat2
	local b = math.rad(self.longitude) - math.rad(loc.longitude)

	local s = 2 * math.asin(math.sqrt(math.pow(math.sin(a/2),2) + math.cos(radLat1)*math.cos(radLat2)*math.pow(math.sin(b/2),2)))
	s = s * EARTH_RADIUS
	local dist = math.floor(s * 10000 +.5) / 10000
	return dist
end

function M:Location2String()
	if self.default then return "" end
	local str = self.longitude .. "," .. self.latitude
	return str
end

function M:String2Location()
	local loc = string.split(str, ",")
	return loc
end

function M:LoadLocation(str)
	local loc = string.split(str, ",")
	self.longitude = tonumber(loc[1])
	self.latitude = tonumber(loc[2])
end

return M