Monitor API

--[[
    This is a api designed to provide basic utilities for
    when you are coding and making interfaces on monitors.
    This will eventually be expanded to handle GUIs and
    interactive menus.
]]
local textColor = colors.white
local backgroundColor = colors.black
local lastMonitor

--MONITOR SELECTION--
lastMon = term.current()
function setMon(monitor)
    --Sets active terminal to the one you specify
    lastMon = term.current()
    local mon = monitor
    term.redirect(monitor)
end

function lastMon()
  --Sets the current to the last monitor and restores the new 'old' one to lastMon so
  --you can toggle back and forth
  setMon(lastMonitor)
end

--Text Manipulation--
function center(text)
    --Writes to center text on the line, does not go to next line
    width = select(1, term.getSize())
    currentLine = select(2,term.getCursorPos())
    if #text >= width then
        term.setCursorPos(1,currentLine) --No space left, use everything
    else
        term.setCursorPos(math.floor((width-#text)/2),currentLine) --Space left is width - number of chars in the text, put the cursor halfway (round down so you don't go over)
    end

    term.write(text)
end

function right(text)
    --Writes text with right alignment to the terminal
    width = select(1, term.getSize())
    currentLine = select(2,term.getCursorPos())
    if #text >= width then
        term.setCursorPos(1,currentLine) --No space left, use everything
    else
        term.setCursorPos((width-text),currentLine)
    end

    term.write(text)
end

--PAINTING--
function paintLine(color)
    --Paints the line you are currently on and goes to x = 1 of that line
    term.setBackgroundColor(color)
    term.clearLine()
    term.setCursorPos(1, select(2, term.getCursorPos()))
end

function paintScreen(color)
    --Paints the screen and sets cursor to 1,1
    term.setBackgroundColor(color)
    term.clear()
    term.setCursorPos(1,1)
end

function paintPBar(value, ...) --Value should be a number between .00 and 100. Numbers bigger than 1 mean you are making 100 your 'top number' for percentages
    --paintPBar(value, isDecimal?
    --Paints a progress bar displaying how far something is depending on how much room it has in the window
    oldText = textColor
    oldBack = backgroundColor

    width, height = term.getSize()
    if type(select(1, ...)) == "number" and select(2,...) <= select(1, term.getCursorPos()) then
        --This alows the user to input a custom stopping point (which comes before the end of the screen)
        --It requires the number entered to be less than or equal to the total width of the screen (for obvious reason)
        width = select(1,...)
    end

    --Converts all values to usable numbers for unified mathy stuff later in
    if value > 100 then
        error("The value you entered: "..value.." is too large!", 2)
    end

    if value > 1 then
        value = value/100
    end

    barSize = width - select(1,term.getCursorPos())
    incAmnt = (math.ceil(100/barSize)/100)

    --Now to paint the progress bar
    if term.isColor then --Just a check on if it's a colored display or not
        inc = 0 --This keeps track of how full the bar is

        --This is a fancy effect for being an indicator on the bar
        fullColor = colors.blue
        if value > .74 then
            fullColor = colors.blue
        elseif value > .39 then
            fullColor = colors.yellow
        else
            fullColor = colors.red
        end

        for i=select(1,term.getCursorPos()), width do
            inc = inc + incAmnt
            if value >= inc then
                term.setBackgroundColor(fullColor)
            else
                term.setBackgroundColor(colors.gray)
            end

            --Now that the right color is set, time to finally draw it
            term.write(" ")
        end
    else
        inc = 0 --This keeps track of how full the bar is
        incAmnt = (math.ceil(100/(barSize-2)/100))
        term.write("<")
        for i=select(1,term.getCursorPos()), width do
            inc = inc + incAmnt
            term.setBackgroundColor(colors.white)
            if value >= inc then
                term.write("|")
            else
                term.write(" ")
            end
        end
        term.write(">")
    end

    --Now I"m restoring old settings so after the draw, you can return to what you were doing
    term.setTextColor(oldText)
    term.setBackgroundColor(oldBack)
end

function title(titleText, textColor, backColor)
    --title(titleText, textColor, backgroundColor), default is white and blue
    if not textColor then textColor = colors.white end
    if not backColor then backColor = colors.blue end
end

--Overwrites--
--I am modifying setTextColor and setBackgroundColor so that they do what they normally do, but also store the color in here when they do it for me to access
setTextColor = term.setTextColor
setBackgroundColor = term.setBackgroundColor

function setColor(color, var, func)
    func(color)
    var = color
end
term.setTextColor = function(color) return setColor(color, textColor, setTextColor) end
term.setBackgroundColor = function(color) return setColor(color, BackgroundColor, setBackgroundColor) end

--I did all of that so I could add these functions to the table (because we NEED them?)
function term.getTextColor() return textColor end
function term.getBackgroundColor() return backgroundColor end