Website for Lieu

--[[
=========================================

                        Trystan Cannon
                        9/29/12
Website for lieu

A website designed for 1lann's firefox
for lieu's company.
=========================================
--]]

--=Constants===========================--
local nScreenWidth, nScreenHeight = term.getSize() -- Grab the dimensions of the screen ot put into the constants table.
tConstants = {
    ["SCREEN_HEIGHT"] = nScreenHeight,
    ["SCREEN_WIDTH"] = nScreenWidth
}
nScreenWidth, nScreenHeight = nil, nil -- Free up the variabels for nScreenWidth and nScreenHeight because they're in the constants table now.
--=====================================--

--=Basic Gui Methods=============--
-- Prints the passed string in the exact center of the screen on the line (nHeight) provided.
function printCentered(nHeight, sString)
    term.setCursorPos(tConstants["SCREEN_WIDTH"]/2 - sString:len()/2, nHeight)
    term.write(sString)
end

-- Prints the passed string to the very right of the screen on the line (nHeight) provided.
function printRight(nHeight, sString)
    term.setCursorPos(tConstants["SCREEN_WIDTH"] - sString:len(), nHeight)
    term.write(sString)
end

-- Clears the screen of all text, and repositions the cursor to the upper right (1,1) of the screen.
function clearScreen()
    term.clear()
    term.setCursorPos(1, 1)
end
--===============================--

--=Website specific GUI methods====================--
-- Prints the screen border with the format:
-- +-----+
-- |     |
-- +-----+
function printBorder()
    -- Prints a horizontal line with the border format.
    local function printHorizontalLine(xPos, yPos)
        term.setCursorPos(xPos, yPos)
        term.write("+" .. string.rep("-", tConstants["SCREEN_WIDTH"] - 2) .. "+")
    end

    -- Print the top line of the screen.
    printHorizontalLine(1, 1)
    -- Print the center of the screen with horizontal characters (pipes: | |).
    for nHeight = 2, tConstants["SCREEN_HEIGHT"] - 1 do
        term.setCursorPos(1, nHeight)
        term.write("|")

        term.setCursorPos(tConstants["SCREEN_WIDTH"], nHeight)
        term.write("|")
    end
    -- Print the bottom line of the screen.
    printHorizontalLine(1, tConstants["SCREEN_HEIGHT"])
end

-- Prints a box with the passed corner, horizontal, and vertical characters with the dimensions of the passed width and height with
-- the upper left hand corner of the box beginning at (xPos, yPos).
function printBox(cCornerChar, cHorizontalChar, cVerticalChar, nWidth, nHeight, xPos, yPos)
    -- Establish the horizontal and vertical line local methods.
    local function printHorizontalLine(cCornerChar, cHorizontalChar, nLength)
        print(cCornerChar .. string.rep(cHorizontalChar, nLength - 2) .. cCornerChar)
    end

    local function printVerticalLine(cVerticalChar, nLength)
        print(cVerticalChar .. string.rep(" ", nLength - 2) .. cVerticalChar)
    end


    -- Set the cursor to the position of the upper left hand corner
    -- of where the box will begin.
    term.setCursorPos(xPos, yPos)
    -- Print the top line of the box.
    printHorizontalLine(cCornerChar, cHorizontalChar, nWidth)
    -- Print as many vertical lines as the height of the box to create the "body" of the box.
    for nLine=1, nHeight do
        term.setCursorPos(xPos, yPos+nLine)
        printVerticalLine(cVerticalChar, nWidth)
    end
    -- Print the bottom line of the box.
    term.setCursorPos(xPos, yPos+nHeight)
    printHorizontalLine(cCornerChar, cHorizontalChar, nWidth)
end

-- Prints the header of the company website.
function printHeader(sTitle)
    -- Print a box that is wide enough for the title with two spaces on the outside; we can center the text inside the box.
    printBox("*", "*", "*", sTitle:len() + 2, 3, tConstants["SCREEN_WIDTH"]/2 - (sTitle:len() + 4)/2, 2)
    -- Print the title in the center of the box.
    printCentered(3, sTitle) -- Assuming that the box has been centered correctly, this line should appear directly in the center of the box.
end
--=================================================--

--=Menu printing methods==============================--
-- Prints a menu table with the format: tMenu[n] = {sTitle, fAssociatedFunction}
-- *fAssociated function is the identifier of the method that will be called if
-- that selection is selected by the user. (Enter is pressed on that selection).
function printMenu(tMenu, nSelection, xPos, yPos)
    for nOption, tOptionTable in ipairs(tMenu) do
        term.setCursorPos(xPos, yPos + (nOption - 1)) -- Subtract one from the option when printing on the height to make sure that we use
                                                      -- the original yPos provided in the parameters.

        -- If the option that is being printed is selected, then print brackets around it.
        if nSelection == nOption then
            term.write("[" .. tOptionTable.sTitle .. "]")
        -- If the option that is being printed is not selected, then just print it regularly.
        else
            term.write(" " .. tOptionTable.sTitle .. " ") -- Print spaces around the option to compensate for the lack of brackets in the spacing.
        end
    end
end
--====================================================--

--=Key handling methods (for the menu)======================--
-- Takes a key code and performs the appropriate operation depending on what the key code was.
-- Executes the option depending on the menu provided with the format: tMenu[n] = {sTitle, fAssociatedFunction}
-- WILL RETURN THE SELECTION!!!
function handleKeyPress(nKey, nSelection, tMenu)
    -- If the ENTER key was pressed, then execute the associated function with the option.
    if nKey == 28 then
        -- Execute the associated function.
        tMenu[nSelection].fAssociatedFunction()
    -- If the up key was pressed and the selection is currently greater than one, move the selection up.
    elseif nKey == 200 and nSelection > 1 then
        -- Move the selection up one.
        nSelection = nSelection - 1
    -- If the down key was pressed and the selection is currently less than the total number of selections, move the selection down.
    elseif nKey == 208 and nSelection < #tMenu then
        -- Move the selection down one.
        nSelection = nSelection + 1
    end

    return nSelection
end
--==========================================================--