--@include libs/utils.txt
--@client

require("/koptilnya/libs/utils.txt")

EngineSound = class("EngineSound")

accessorFunc(EngineSound, "_masterVolume", "MasterVolume", 1)
accessorFunc(EngineSound, "_parent", "Parent", chip())

local function fadeIn(rpm, range)
    local fadeIn = 1
    
    if range and range[1] != range[2] then
        fadeIn = math.min(math.max((rpm + (range[2] - range[1] * 2)) / (range[2] - range[1]), 1) - 1, 1)
    end
    
    return fadeIn
end

local function fadeOut(rpm, range)
    local fadeOut = 1
    
    if range and range[1] != range[2] then
        fadeOut = math.min(math.max((rpm + (range[1] - range[2] * 2)) / (range[1] - range[2]), 1) - 1, 1)
    end
    
    return fadeOut
end

function EngineSound:initialize(soundsMap)
    self._rpm = 0
    self._targetRPM = 0
    self._soundsMap = soundsMap
    self._sources = {}
    
    for k, v in pairs(soundsMap) do
        bass.loadURL(v.link, "3d noblock", function(snd, err, errtxt)
            if snd then
                snd:setPos(self:getParent():getPos())
                snd:setLooping(true)
                snd:setVolume(0)
                
                v.source = snd
                table.insert(self._sources, snd)
            elseif errtext then
                error(errtxt)
            end
        end)
    end
    
    hook.add("think", "EngineSound_think", function()
        self._rpm = math.lerp(0.2, self._rpm, self._targetRPM)
    
        for _, v in pairs(self._soundsMap) do
            if v.source then
                v.source:setPos(self:getParent():getPos())
                
                local pitch = self._rpm / v.rootPitch
                local fadeIn = fadeIn(self._rpm, v.fadeIn)
                local fadeOut = fadeOut(self._rpm, v.fadeOut)            
                
                v.source:setVolume(math.max(self:getMasterVolume() * (fadeIn + fadeOut - 1), 0.01))
                v.source:setPitch(math.max(pitch, 0.01))
            end
        end
    end)
end

function EngineSound:setRPM(rpm)
    self._targetRPM = rpm
end

function EngineSound:getRPM()
    return self._rpm
end

function EngineSound:getSources()
    return self._sources
end