if not turtle then
    printError("not a turtle")
    return
end

local base_path = "https://git.salushnes.solutions/hkc/cc-stuff/raw/branch/master/turtos"

_G._TOS_VER = "N/A"
local tos_ver_fp = io.open("/.tos-ver", "r")
if tos_ver_fp then
    _G._TOS_VER = tos_ver_fp:read("l")
    tos_ver_fp:close()
end

local function getFile(url, path)
    local r, err = http.get(url)
    io.write("GET " .. path .. " ... ")
    if not r then
        print("FAIL: " .. err)
        return false, err
    end
    io.open(path, "w"):write(r.readAll()):close()
    io.write("OK\n")
end


local req, err = http.get(base_path .. "/update.json")
if not req then
    printError("Failed to get update info:", err)
else
    local info = textutils.unserializeJSON(req.readAll())
    req.close()

    print("OTP version: " .. info.ver)
    print("H/W version: " .. _TOS_VER)

    if info.ver == _TOS_VER then
        print("Running on latest firmware")
    else
        print("Performing an update...")
        for i = 1, #info.files do
            local file = info.files[i]
            term.write(file.dst, "...")
            if fs.exists(file.dst) then
                term.write(" [DEL] ...")
                fs.delete(file.dst)
            end
            getFile(base_path .. file.src, file.dst)
        end
        print("Writing new version info")
        io.open("/.tos-ver", "w"):write(info.ver):close()
        print("Rebooting")
        return os.reboot()
    end
end

shell.run("fg", "main.lua")