PLUGIN.Title = "Auto Compass"
PLUGIN.Description = "Automatic compass shows direction player is facing via notice box"
PLUGIN.Author = "LazyMammal"
PLUGIN.Version = "0.1.0"

-- timers use global scope to allow smooth "oxide.reload autocompass"
if ACpopupTimer or ACsaveTimer then
    print "Auto Compass: cancelling old timers"
end
if ACpopupTimer then ACpopupTimer:Destroy() end
if ACsaveTimer then ACsaveTimer:Destroy() end
ACpopupTimer = nil
ACsaveTimer = nil

function PLUGIN:Init()

    -- load config file
    self.cfgfile = "autocompass"
    local b, res = config.Read(self.cfgfile)
    self.Config = res or {}
    if (not b) or (self.Config.update_interval == nil) then
        self:LoadDefaultConfig()
        if (res) then config.Save(self.cfgfile) end
    end

    -- load player toggle preferences
    self.toggleTable = {}
    self.toggleDataFile = util.GetDatafile( "autocompass_data" )
    local txt = self.toggleDataFile:GetText()
    if txt ~= "" then self.toggleTable = json.decode( txt ) end

    -- store last known angle
    self.angleTable = {}

    -- add chat commands
    self:AddChatCommand( "compass", self.cmdCompass)

    -- add timers
    print "Auto Compass: initiating timers"
    ACpopupTimer = timer.Repeat( self.Config.update_interval, function() self:AutoCompass() end )
    ACsaveTimer = timer.Repeat( self.Config.save_interval, function() self:SaveTogglePrefs() end )

end

function PLUGIN:LoadDefaultConfig()
    print "Auto Compass: using default config"
    self.Config.update_interval = 5 -- popup update frequency (seconds)
    self.Config.save_interval = 300 -- user prefs save frequency (seconds)
end

function PLUGIN:SaveTogglePrefs()
    self.toggleDataFile:SetText( json.encode( self.toggleTable ) )
    self.toggleDataFile:Save()
end

function PLUGIN:AutoCompass()  -- function called by timer, checks each player for change in direction
    local userlist = rust.GetAllNetUsers()
    for k, netuser in pairs(userlist) do
        local steamID = rust.CommunityIDToSteamID( tonumber(rust.GetUserID(netuser)) )
        local toggle = self.toggleTable[steamID]
        if toggle then
            -- test for 'significant' change
            local angle = self:GetAngle(netuser)
            local prev = self.angleTable[steamID]
            local diff = nil
            if not (prev == nil) then diff = (prev-angle+360)%360 end

            if (prev == nil) or (diff == nil) or (diff > 5 and diff < 355) then -- not within 5 deg of prev
                self.angleTable[steamID] = angle

                -- send popup notice to player
                local label = self:GetLabel(angle)
                rust.InventoryNotice(netuser, label)
            else
                -- force popup next time
                self.angleTable[steamID] = nil
            end
        end
    end
end

function PLUGIN:GetAngle(netuser)
    local controllable = netuser.playerClient.controllable
    if (controllable == nil) then return 0 end
    local char = controllable:GetComponent("Character")
    return tonumber(((char.eyesYaw+90)%360)) -- angle in degrees
end

function PLUGIN:GetLabel(angle)
    -- get (inter)cardinal direction
    local octal = 1+math.floor((angle+22.5)/360*8)%8 -- eight directions (index 1..8)
    -- build direction label
    local label = {"Norte","Noreste","Este","Sudeste","Sur","Sudoeste","Oeste","Noroeste"}
    return label[octal] .. " " .. math.floor(angle) .. "°"
end

function PLUGIN:cmdCompass(netuser, cmd, args)  -- chat command to toggle popup notification
    local steamID = rust.CommunityIDToSteamID( tonumber(rust.GetUserID(netuser)) )
    if self.toggleTable[steamID] then
        self.toggleTable[steamID] = nil
        rust.Notice(netuser, "Brujula OFF")
    else
        self.toggleTable[steamID] = true
        rust.Notice(netuser, "Brujula ON")
    end
end