cc_os

monitor_left = peripheral.wrap("monitor_44")
monitor_middle = peripheral.wrap("monitor_45")
monitor_right = peripheral.wrap("monitor_46")

Active_Monitor = nil

function calculateCenter(w, text)
    return math.floor((w - string.len(text)) / 2) + 1
end

function writeMonitor(x, y, text)
    Active_Monitor.setCursorPos(x, y)
    Active_Monitor.write(text)
end

function clearBackground(colourr, textColour)
    Active_Monitor.setBackgroundColor(colourr)
    Active_Monitor.setTextColor(textColour)
    Active_Monitor.clear()
end

function ClearMonitor()
    Active_Monitor.setTextColor(colours.black)
    Active_Monitor.setBackgroundColor(colours.black)
    Active_Monitor.clear()
    Active_Monitor.setCursorPos(1,1)
end

function DrawText(xPos, yPos, text, textColour, backgroundColour)
    Active_Monitor.setBackgroundColor(backgroundColour)
    Active_Monitor.setTextColor(textColour)
    Active_Monitor.setCursorPos(xPos,yPos)
    Active_Monitor.write(text)
end

function DrawCenteredHorizontal(xPos, yPos, width, text, textColour, backgroundColour)
    -- width could be the size of your monitor, or anything else. this means it
    -- doesn't have to stretch your entire monitor's if you want. imagine
    -- it as a rectangle and the text is in the center.
    local textLength = string.len(text)
    local centerX = (width / 2) - (textLength / 2)
    DrawText(xPos + centerX, yPos, text, textColour, backgroundColour)
end

function DrawLineH(xPos, yPos, lineLength, colour)
    Active_Monitor.setBackgroundColor(colour)
    Active_Monitor.setTextColor(colour)
    Active_Monitor.setCursorPos(xPos,yPos)
    Active_Monitor.write(string.rep(" ", lineLength))
end

function DrawLineV(xPos, yPos, width, lineHeight, colour)
    Active_Monitor.setBackgroundColor(colour)
    for i = 1, lineHeight, 1 do
        Active_Monitor.setCursorPos(xPos, yPos + (i - 1))
        Active_Monitor.write(string.rep(" ", width))
    end
end

function DrawSquare(xPos, yPos, nWidth, nHeight, backgroundColour)
    Active_Monitor.setBackgroundColor(backgroundColour)
    for i = 1, math.ceil(nHeight), 1 do
        Active_Monitor.setCursorPos(xPos, yPos + (i - 1))
        Active_Monitor.write(string.rep(" ", nWidth))
    end
end

function ProgressBar(xPos, yPos, width, value, maxValue, backgroundColour, progressColour)
    DrawLineH(xPos, yPos, width, backgroundColour) --backgoround bar
    local barSize = math.floor((value/maxValue) * width)
    DrawLineH(xPos, yPos, barSize, progressColour) --progress so far
end

WINDOW_TITLE_COLOUR = colours.lightGrey
WINDOW_CLIENT_COLOUR = colours.grey

progress_val = 20

function DrawWindow(title, x, y, w, h)
    DrawSquare(x, y, w, 1, WINDOW_TITLE_COLOUR)
    DrawText(x, y, title, colours.black, WINDOW_TITLE_COLOUR)
    DrawSquare(x, y + 1, w, h - 1, WINDOW_CLIENT_COLOUR)
    local buttonStart = x + w - 4
    DrawText(buttonStart, y, "-", colours.white, colours.blue)
    DrawText(buttonStart + 1, y, "[]", colours.white, colours.blue)
    DrawText(buttonStart + 3, y, "x", colours.red, colours.blue)
end

function drawLeftMonitor()
    clearBackground(colours.white, colours.black)
    DrawWindow("hello window xd", 2, 3, 20, 8)
    DrawWindow("eek", 9, 12, 8, 5)
end

function drawMiddleMonitor()
    clearBackground(colours.white, colours.black)
    DrawWindow("hello window xd", 7, 3, 24, 12)

    ProgressBar(8, 5, 22, progress_val, 100, colours.blue, colours.lightBlue)
end

function drawRightMonitor()
    clearBackground(colours.white, colours.black)
    DrawWindow("xd", 3, 7, 10, 7)
end

function main()
    Active_Monitor = monitor_left
    drawLeftMonitor()

    Active_Monitor = monitor_middle
    drawMiddleMonitor()

    Active_Monitor = monitor_right
    drawRightMonitor()

    Active_Monitor = nil

    progress_val = progress_val + 10
    if (progress_val == 110) then
        progress_val = 0
    end

    os.sleep(0.5)
end

while true do
    main()
end