--[[
Plan:
    Addition, subtraction
        Table storage
    Selection menu (touch)
        Event handler, coordinates return
--]]
--7x9
-- Variables being assigned a starting value
numTable = { numOne, numTwo, numThree, numFour, numFive, numSix }
numSelector = 1
local x, y = 1, 2
function calcClear( )
    for i = 1, 6 do
        numTable[ i ] = nil
    end
    numSelector = 1
    term.setBackgroundColor( colors.black )
    drawCalc( )
end
function bSpace( )
    term.setBackgroundColor( colors.gray )
    term.write( " " )
    term.setBackgroundColor( colors.black )
end
function drawCalc( ) -- Ugliest piece of code I've written in my god damn life HOLY FUCK get it away from me (it works tho)
    term.clear( )
    term.setCursorPos( 1, 1 )
    term.setBackgroundColor( colors.gray )
    print( "               " )
    bSpace( )
    term.write( "7" )
    bSpace( )
    term.write( "8" )
    bSpace( )
    term.write( "9" )
    bSpace( )
    bSpace( )
    term.setCursorPos(15, 2 )
    bSpace( )
    term.setCursorPos( 1, 3 )
    term.setBackgroundColor( colors.gray )
    print( "               " )
    bSpace( )
    term.write( "4" )
    bSpace( )
    term.write( "5" )
    bSpace( )
    term.write( "6" )
    bSpace( )
    term.setCursorPos( 1, 5 )
    term.setBackgroundColor( colors.gray )
    print( "       " )
    bSpace( )
    term.write( "1" )
    bSpace( )
    term.write( "2" )
    bSpace( )
    term.write( "3" )
    bSpace( )
    term.setCursorPos( 1, 7 )
    term.setBackgroundColor( colors.gray )
    print( "       " )
    bSpace( )
    term.write( "C" )
    bSpace( )
    term.write( "0" )
    bSpace( )
    term.write( "=" )
    bSpace( )
    term.setCursorPos( 1, 9 )
    term.setBackgroundColor( colors.gray )
    term.write( "       " )
end
function runCalculation( )

end
function getInput( )
    while true do
        local e = { os.pullEvent( ) }
        if e[ 1 ] == "key" then
            if ( e[ 2 ] == keys.one ) or ( e[ 2 ] == keys.numPad1 )then -- 1 or numpad 1 pressed
                numTable[ numSelector ] = 1
                numSelector = numSelector + 1
                numString = "1"
            elseif ( e[ 2 ] == keys.two ) or ( e[ 2 ] == keys.numPad2 ) then -- 2 or numpad 2 pressed
                numTable[ numSelector ] = 2
                numSelector = numSelector + 1
                numString = "2"
            elseif ( e[ 2 ] == keys.three ) or ( e[ 2 ] == keys.numPad3 ) then -- 3 or numpad 3 pressed
                numTable[ numSelector ] = 3
                numSelector = numSelector + 1
                numString = "3"
            elseif ( e[ 2 ] == keys.four ) or ( e[ 2 ] == keys.numPad4 ) then -- 4 or numpad 4 pressed
                numTable[ numSelector ] = 4
                numSelector = numSelector + 1
                numString = "4"
            elseif ( e[ 2 ] == keys.five ) or ( e[ 2 ] == keys.numPad5 ) then -- 5 or numpad 5 pressed
                numTable[ numSelector ] = 5
                numSelector = numSelector + 1
                numString = "5"
            elseif ( e[ 2 ] == keys.six ) or ( e[ 2 ] == keys.numPad6 ) then -- 6 or numpad 6 pressed
                numTable[ numSelector ] = 6
                numSelector = numSelector + 1
                numString = "6"
            elseif ( e[ 2 ] == keys.seven ) or ( e[ 2 ] == keys.numPad7 ) then -- 7 or numpad 7 pressed
                numTable[ numSelector ] = 7
                numSelector = numSelector + 1
                numString = "7"
            elseif ( e[ 2 ] == keys.eight ) or ( e[ 2 ] == keys.numPad8 ) then -- 8 or numpad 8 pressed
                numTable[ numSelector ] = 8
                numSelector = numSelector + 1
                numString = "8"
            elseif ( e[ 2 ] == keys.nine ) or ( e[ 2 ] == keys.numPad9 ) then -- 9 or numpad 9 pressed
                numTable[ numSelector ] = 9
                numSelector = numSelector + 1
                numString = "9"
            elseif ( e[ 2 ] == keys.zero ) or ( e[ 2 ] == keys.numPad0 ) then -- 0 or numpad 0 pressed
                numTable[ numSelector ] = 0
                numSelector = numSelector + 1
                numString = "0"
            elseif e[ 2 ] == keys.enter then
                runCalculation( )
            end
        elseif e[ 1 ] == "mouse_click" then
            local clickCoord = { e[ 3 ], e[ 4 ] }
            if clickCoord[ 2 ] == 2 then -- Line 1, numbers 7, 8, 9
                if clickCoord[ 1 ] == 2 then -- #7 clicked
                    numTable[ numSelector ] = 7
                    numSelector = numSelector + 1
                    numString = "7"
                elseif clickCoord[ 1 ] == 4 then -- #8 clicked
                    numTable[ numSelector ] = 8
                    numSelector = numSelector + 1
                    numString = "8"
                elseif clickCoord[ 1 ] == 6 then -- #9 clicked
                    numTable[ numSelector ] = 9
                    numSelector = numSelector + 1
                    numString = "9"
                end
            elseif clickCoord[ 2 ] == 4 then -- Line 2, numbers 4, 5, 6
                if clickCoord[ 1 ] == 2 then -- #4 clicked
                    numTable[ numSelector ] = 4
                    numSelector = numSelector + 1
                    numString = "4"
                elseif clickCoord[ 1 ] == 4 then -- #5 clicked
                    numTable[ numSelector ] = 5
                    numSelector = numSelector + 1
                    numString = "5"
                elseif clickCoord[ 1 ] == 6 then -- #6 clicked
                    numTable[ numSelector ] = 6
                    numSelector = numSelector + 1
                    numString = "6"
                end
            elseif clickCoord[ 2 ] == 6 then -- Line 3, number 1, 2, 3
                if clickCoord[ 1 ] == 2 then -- #1 clicked
                    numTable[ numSelector ] = 1
                    numSelector = numSelector + 1
                    numString = "1"
                elseif clickCoord[ 2 ] == 4 then -- #2 clicked
                    numTable[ numSelector ] = 2
                    numSelector = numSelector + 1
                    numString = "2"
                elseif clickCoord[ 1 ] == 6 then -- #3 clicked
                    numTable[ numSelector ] = 3
                    numSelector = numSelector + 1
                    numString = "3"
                end
            elseif clickCoord[ 2 ] == 8 then
                if clickCoord[ 1 ] == 2 then -- Clear clicked
                    calcClear( )
                elseif clickCoord[ 1 ] == 4 then -- #0 clicked
                    numTable[ numSelector ] = 0
                    numSelector = numSelector + 1
                    numString = "0"
                elseif clickCoord[ 1 ] == 6 then -- Equals clicked
                    runCalculation( )
                end
            end
        end
        if numSelector > 1 then
            term.setTextColor( colors.yellow )
            term.setCursorPos( numSelector + 7, 2 )
            term.write( numString )
        end
        if numSelector > 6 then
            runCalculation( )
        end
    end
end
drawCalc( )
getInput( )