[energy_monitor] standalone APC

-- APC code by Tobast. Intended for setup (from front) :
--         [ screen ]
-- [batbox][computer][batbox]

------------------ CONFIG --------------------
AREA_NAME=''
BATBOX_LIGHTS_SIDE='left'
BATBOX_OTHERS_SIDE='right'
SCREEN_SIDE='top'
----------------- END CONFIG -----------------

os.loadAPI('/lib/slot_sig')
os.loadAPI('/lib/button')

STATE_ON = 0
STATE_OFF = 1
STATE_FORCEOFF = 2

state_lights = 0
state_others = 0

nextUpdateTimer = nil

function onBtnLightsClicked()
    if(state_lights == STATE_ON) then
        setBatboxState(false, BATBOX_LIGHTS_SIDE, false)
    else
        setBatboxState(true, BATBOX_LIGHTS_SIDE, false)
    end
end

function onBtnOthersClicked()
    if(state_others == STATE_ON) then
        setBatboxState(false, BATBOX_OTHERS_SIDE, false)
    else
        setBatboxState(true, BATBOX_OTHERS_SIDE, false)
    end
end

btn_lights = button.Button(SCREEN_SIDE, 8, 1, '', onBtnLightsClicked)
btn_others = button.Button(SCREEN_SIDE, 8, 6, '', onBtnOthersClicked)

function getEUStored(side)
    periph = peripheral.wrap(side)
    return periph.getEUStored()
end

function getPercentage(side)
    periph = peripheral.wrap(side)
    return math.floor(periph.getEUStored() / periph.getEUCapacity() * 100)
end

function onLevelsQuery(requester)
    data = {}
    data.type='EU_levels'
    data.area=AREA_NAME
    data.lights = getEUStored(BATBOX_LIGHTS_SIDE)
    data.lightsPercent = getPercentage(BATBOX_LIGHTS_SIDE)
    data.others = getEUStored(BATBOX_OTHERS_SIDE)
    data.othersPercent = getPercentage(BATBOX_OTHERS_SIDE)
    data.lightsState = state_lights
    data.othersState = state_others

    rednet.send(requester, data, 'apc_eu_reply')
end

function setBatboxState(nState, side, isForceShutdown)
    redstone.setOutput(side, not nState)

    setButtonState(side, nState, isForceShutdown)
end

function setButtonState(side, nState, isForceShutdown)
    color=nil
    text=''
    if nState==true then
        color = colors.lime
        text=' ON  '
        if(side == BATBOX_LIGHTS_SIDE) then
            state_lights = STATE_ON
        else
            state_others = STATE_ON
        end
    elseif isForceShutdown then
        color = colors.red
        text=' OFF '
        if(side == BATBOX_LIGHTS_SIDE) then
            state_lights = STATE_FORCEOFF
        else
            state_others = STATE_FORCEOFF
        end
    else
        color = colors.orange
        text=' OFF '

        if(side == BATBOX_LIGHTS_SIDE) then
            state_lights = STATE_OFF
        else
            state_others = STATE_OFF
        end
    end

    if(side == BATBOX_LIGHTS_SIDE) then
        btn_lights:setBgColor(color)
        btn_lights:setText(text)
    else
        btn_others:setBgColor(color)
        btn_others:setText(text)
    end
end

function setStates(data)
    setBatboxState(data.lightsState, BATBOX_LIGHTS_SIDE, data.forceLights)
    setBatboxState(data.othersState, BATBOX_OTHERS_SIDE, data.forceOthers)
end

function onRednet(input)
    sender = input[1]
    data = input[2]

    if(type(data) == 'string') then
        data = textutils.unserialize(data)
    end

    if(data.type == 'levels_query') then
        onLevelsQuery(sender)
    elseif(data.type == 'set_state') then
        setStates(data)
    end
end

function initStates()
    setButtonState(BATBOX_LIGHTS_SIDE,
        not redstone.getOutput(BATBOX_LIGHTS_SIDE), false)
    setButtonState(BATBOX_OTHERS_SIDE,
        not redstone.getOutput(BATBOX_OTHERS_SIDE), false)
end

function periodicUpdate()
    mainScreen()
end

function onTimer(data)
    id = data[1]
    if(id == nextUpdateTimer) then
        periodicUpdate()
        nextUpdateTimer = os.startTimer(5)
    end
end

function mainScreen()
    scr = peripheral.wrap(SCREEN_SIDE)

    scr.setCursorPos(1,1)
    scr.setTextColor(colors.lightBlue)
    scr.write('LIGHTS')
    scr.setTextColor(colors.white)
    scr.setCursorPos(3,2)
    scr.write(getPercentage(BATBOX_LIGHTS_SIDE))
    scr.write('%  ')
    scr.setCursorPos(3,3)
    scr.write(getEUStored(BATBOX_LIGHTS_SIDE))
    scr.write('EU')

    scr.setCursorPos(1,6)
    scr.setTextColor(colors.lightBlue)
    scr.write('OTHERS')
    scr.setTextColor(colors.white)
    scr.setCursorPos(3,7)
    scr.write(getPercentage(BATBOX_OTHERS_SIDE))
    scr.write('%  ')
    scr.setCursorPos(3,8)
    scr.write(getEUStored(BATBOX_OTHERS_SIDE))
    scr.write('EU')
end

function main()
    peripheral.call(SCREEN_SIDE, 'clear')
    peripheral.call(SCREEN_SIDE, 'setTextScale', 0.5)

    initStates()
    mainScreen()

    nextUpdateTimer = os.startTimer(5)

    slot_sig.connectSlot('timer', onTimer)

    slot_sig.run()
end
main()