local bf = require("bigfont")

function switch(value)
	-- Handing `cases` to the returned function allows the `switch()` function to be used with a syntax closer to c code (see the example below).
	-- This is because lua allows the parentheses around a table type argument to be omitted if it is the only argument.
	return function(cases)
		
		-- The default case is achieved through the metatable mechanism of lua tables (the `__index` operation).
		setmetatable(cases, cases)
		
		local f = cases[value]
		if f then
			f()
		end
	end
end

-- Make screen components
function Box(x, y, w, h, bg, outline)
    -- Draw the background
    term.setBackgroundColor(bg)
    term.setTextColor(bg)

    for i = 1, h do
        term.setCursorPos(x, y + i)
        term.write(string.rep(" ", w))
    end

    -- Draw the outline
    if outline then
        term.setBackgroundColor(outline)
        term.setTextColor(outline)

        term.setCursorPos(x, y)
        term.write(string.rep(" ", w))

        term.setCursorPos(x, y + h)
        term.write(string.rep(" ", w))

        for i = 1, h do
            term.setCursorPos(x, y + i)
            term.write(" ")
            term.setCursorPos(x + w, y + i)
            term.write(" ")
        end
    end
end

function Text(x, y, text, size, bg, fg)
    term.setBackgroundColor(bg)
    term.setTextColor(fg)
    term.setCursorPos(x + 2, y + 1)
    
    switch(size) {
        ["small"] = function()
            term.write(text)
        end,
        ["medium"] = function()
            bf.bigWrite(text)
        end,
        ["large"] = function()
            bf.hugeWrite(text)
        end
    }
end