local function drawProgBar(done, max)

local value = done / max
local _, y = term.getCursorPos()
local wide, _ = term.getSize()
term.setCursorPos(1,y)
term.clearLine()
term.write(("="):rep(math.floor(value * (wide - 6))))
term.setCursorPos(math.floor(value * (wide - 6)), y)
term.write(">")
term.setCursorPos(wide - 6, y)
term.write("]")
term.setCursorPos(1, y)
term.write("[")
term.setCursorPos(wide - 5, y)
term.write("     ")

local percent = math.floor(value * 100) .. "%"
term.setCursorPos(wide - percent:len(),y)
term.write(percent)

end

local function extractRepository(cpfDir, destDir)
        print("Constructing project...")
        local file = io.open(cpfDir, "r")
        local cFile = nil
        local lc = 0
        local total = 0
        local ox,oy = term.getCursorPos()

        for line in file:lines() do
                if lc > 0 then
                        cFile:write(line.."\n")
                        lc = lc-1
                        term.clearLine()
                        term.setCursorPos(ox,oy)
                        if lc == 0 then
                                cFile:close()
                drawProgBar(total-lc, total)
                print()
                                print("File write complete.")
                        else
                            drawProgBar(total-lc, total)
                        end
                elseif string.find(line, "MKDIR") == 1 then
                        local newDirPath = destDir.."/"..string.sub(line, 7)
                        if fs.exists(newDirPath) then fs.delete(newDirPath) end
                        fs.makeDir(newDirPath)
                        print("Created dir "..newDirPath)
                elseif string.find(line, "MKFIL") == 1 then
                        local newFilPath = destDir.."/"..string.sub(line, 7)
                        if fs.exists(newFilPath) then fs.delete(newFilPath) end
                        cFile = io.open(newFilPath, "w")
                        print("Created file "..newFilPath)
                        ox,oy = term.getCursorPos()
                elseif string.find(line, "WRITE") == 1 then
                        lc = tonumber(string.sub(line, 7))
                        total = lc
                end
                sleep(0)
        end
        print("Project constructed.")
end

local lpath = "/"

local repoCode = "Pht0fFEU"

if fs.exists(lpath .. "startup.lua") then
        print(lpath.." already exists. Rename or use another directory to install.")
        return
end

print("iGP OS Installer")
print("Beta version 1.x.x")
print("\nInstalling to the following directory:")
term.setTextColour(colours.yellow)
print("  "..lpath.."\n")
term.setTextColour(colours.white)
term.write("Ready to install? Y/N: ")

while true do
        local _,p1 = os.pullEvent("key")
        if p1 == keys.y then
                term.setTextColour(colours.lime)
                print("Y\n")
                break
        elseif p1 == keys.n then
                term.setTextColour(colours.red)
                print("N\n")
                os.pullEvent()
                return
        end
end

term.setTextColour(colours.white)
print("Downloading "..repoCode.."... ")
if not shell.run("pastebin", "get", repoCode, "glrepo") then
        term.setTextColour(colours.red)
        print("failed!")
        return
end

extractRepository(shell.resolve(".").."/glrepo", shell.resolve("."))
print("Deleting archive...")
fs.delete(shell.resolve(".").."/glrepo")

print("Installation complete!")