function clear( ... )
    shell.run("clear")
end
function cWrite(text,y)
    x = math.floor(#text/2)
    term.setCursorPos(x,y)
    term.write()
end
local function getFromHttp(url,path)
        local file = http.get(url)
    if file then
            file = file.readAll()
            h=fs.open(path,"w")
            h.write(file)
            h.close()
    else
        error("Github server is not aviable.")
    end
end
selected = false
local c = 1
xt,yt = term.getSize()
xc = xt/2
yc = yt/2
function Cprint(txt,y)
 xt,yt = term.getSize()
 term.setCursorPos(xt / 2 - #txt / 2,tonumber(y))
 print(txt)
end
function slect1( ... )
    term.setBackgroundColor(colors.lightGray)
    term.setTextColor(colors.white)
    Cprint("Install sender",yc-2)
    term.setBackgroundColor(colors.white)
    term.setTextColor(colors.black)
end
function slect2( ... )
    term.setBackgroundColor(colors.lightGray)
    term.setTextColor(colors.white)
    Cprint("Install receiver",yc)
    term.setBackgroundColor(colors.white)
    term.setTextColor(colors.black)
end
function slect3( ... )
    term.setBackgroundColor(colors.lightGray)
    term.setTextColor(colors.white)
    Cprint("   Exit   ",yc+2)
    term.setBackgroundColor(colors.white)
    term.setTextColor(colors.black)
end
function unsall( ... )
    term.setTextColor(colors.gray)
    Cprint("Install sender",yc-2)
    Cprint("Install receiver",yc)
    Cprint("   Exit   ",yc+2)
end
function InstSender( ... )
    clear()
    Cprint("Installing wr_connect...",yc)
    getFromHttp("https://raw.githubusercontent.com/JustGekto/CC-wireless-monitor/master/wr_connect","wr_connect")
    getFromHttp("https://raw.githubusercontent.com/JustGekto/CC-wireless-monitor/master/wr_monitor","wr_monitor")
    term.clear()
    Cprint("Installed wr_conect!",yc)
    os.pullEvent("char")
    term.setBackgroundColor(colors.black)
    term.setCursorPos(1,1)
    term.clear()
    selected = true
    return
end
function InstReceiver( ... )
    clear()
    Cprint("Installing wr_receiver...",yc)
    getFromHttp("https://raw.githubusercontent.com/JustGekto/CC-wireless-monitor/master/wr_receiver","wr_receiver")
    term.clear()
    Cprint("Installed wr_receiver!",yc)
    os.pullEvent("char")
    term.setBackgroundColor(colors.black)
    term.setCursorPos(1,1)
    term.clear()
    selected = true
    return
end
term.setBackgroundColor(colors.white)
term.clear()
term.setTextColor(colors.black)
Cprint("Wireless monitor installer",yc-5)
term.setTextColor(colors.gray)
Cprint("Install sender",yc-2)
Cprint("Install receiver",yc)
Cprint("   Exit   ",yc+2)
slect1()
while not selected do
    local event, code = os.pullEvent("key")
    if code == 208 then --down
        if c == 3 then
            c = 1
        else
             c = c+1
        end
    end
    if code == 200 then --up
        if c == 1 then
            c = 3
        else
            c = c-1
        end
    end
    if code == 28 then
        if c == 1 then
            InstSender()
        elseif c == 2 then
            InstReceiver()
        elseif c == 3 then
            term.setBackgroundColor(colors.black)
            term.setCursorPos(1,1)
            term.clear()
            return
        end
    end
    if c == 1 and not selected then
        unsall()
        slect1()
    end
    if c == 2 and not selected then
        unsall()
        slect2()
    end
    if c == 3 and not selected then
        unsall()
        slect3()
    end
end