display.setStatusBar( display.HiddenStatusBar )
local physics = require("physics")

physics.start(true)
physics.setDrawMode("hybrid")

local w,h = display.contentWidth, display.contentHeight

local moveGroup = display.newGroup()

-- Ground
local bump = display.newImage("ramp.png")
bump:setReferencePoint(display.CenterDownReferencePoint)
bump.x = w-240
bump.y = h-150
moveGroup:insert(bump)

local ground1 = display.newRect(moveGroup, 0, h-120, w, 20)
ground1:setFillColor(255,0,0)

physics.addBody(ground1, "static", {friction = 0.5, bounce = 0.5, density=2.0})
physics.addBody(bump, "dynamic", {friction = 0.5, bounce = 0.5, density=2.0, shape={-40, 20, 40, -20, 40, 20}})
-- Car
local frame = display.newRect(50, h-200, 60, 40)
frame:setFillColor(0,128,0)
local leftWheel = display.newCircle(50, h-160, 20)
leftWheel:setFillColor(0,255,0)
local rightWheel = display.newCircle(110, h-160, 20)
rightWheel:setFillColor(0,255,0)

physics.addBody(leftWheel, "dynamic", {friction = 2, bounce = 0.4, radius = 20})
physics.addBody(rightWheel, "dynamic", {friction = 2, bounce = 0.4, radius = 20})
physics.addBody(frame, "dynamic", {friction = 0.5, bounce = 0.1})

local jointLeftWheelFrame = physics.newJoint("pivot", leftWheel, frame, 50, h-160)
local jointRightWheelFrame = physics.newJoint("pivot", rightWheel, frame, 110, h-160)

-- Controls
--======================
-- throttle button
local applyingForce = 0

local buttonTouched = function(event)
    if (event.target.name == "throttle") then
        if (event.phase == "began") then
            applyingForce = 1
        elseif (event.phase == "ended") then
            applyingForce = 0
        end
    elseif(event.target.name == "2") then
        if (event.phase == "began") then
            applyingForce = -1
        elseif (event.phase == "ended") then
            applyingForce = 0
        end
    elseif(event.target.name == "3") then
        if (event.phase == "began") then
            frame:applyForce(5,0,frame.x, frame.y)
        end
    end
end

local controlThrottle = display.newRoundedRect(10, 230, 30, 70, 10)
controlThrottle.strokeWidth = 2
controlThrottle:setFillColor(0,0,200)
controlThrottle:setStrokeColor(0,0,150)
controlThrottle.name = "throttle"
controlThrottle:addEventListener("touch", buttonTouched)

local controlThrottleLabel = display.newText("<", 20, 250, nil, 20)

local control2 = display.newRoundedRect(40, 230, 30, 70, 10)
control2.strokeWidth = 2
control2:setFillColor(0,0,200)
control2:setStrokeColor(0,0,150)
control2.name = "2"
control2:addEventListener("touch", buttonTouched)

local control2Label = display.newText(">", 45, 250, nil, 20)

local control3 = display.newRoundedRect(70, 230, 30, 70, 10)
control3.strokeWidth = 2
control3:setFillColor(0,0,200)
control3:setStrokeColor(0,0,150)
control3.name = "3"
control3:addEventListener("touch", buttonTouched)

local control3Label = display.newText("^", 80, 250, nil, 20)

local gameLoop = function(event)
    moveGroup.x = moveGroup.x - 5 * applyingForce
    --ground1.x = ground1.x - 5 * applyingForce
end

Runtime:addEventListener("enterFrame", gameLoop)

--physics.stop()