function IsFileExist(filename)
    local f = io.open(filename)
    if f ~= nil then
        io.close(f)
        return true
    else
        return false
    end
end

function IsDirectoryExist(dirname)
    return os.rename(dirname, dirname) and true or false
end

local jdtlspath = os.getenv("HOME") .. "/.jdtls"
if vim.loop.os_uname().sysname == "Windows" then
    jdtlspath = os.getenv("HOME") .. "\\.jdtls"
end

-- 创建目录
if not IsFileExist(jdtlspath) then
    os.execute("mkdir " .. jdtlspath)
end

-- 检测文件存在否
if not IsDirectoryExist(jdtlspath .. "/bin/jdtls") then
    print("download jdtls binary")
    local download_ret = os.execute(
        "wget https://download.eclipse.org/jdtls/milestones/1.23.0/jdt-language-server-1.23.0-202304271346.tar.gz -P /tmp"
    )
    if download_ret ~= 0 then
        vim.notify("download jdtls binary failed")
        return
    end
    vim.notify("download jdtls success")
    local tar_ret = os.execute("tar xvzf /tmp/jdt-language-server-1.23.0-202304271346.tar.gz -C " .. jdtlspath)
    if tar_ret ~= 0 then
        vim.notify("extract jdtls file failed")
        return
    end
end

local lombok_path = jdtlspath .. "/bin/lombok.jar"
-- 下载lombok
if not IsFileExist(jdtlspath .. "/bin/lombok.jar") then
    vim.notify("download lombok.jar")
    local download_ret = os.execute("wget https://projectlombok.org/downloads/lombok.jar -P " .. jdtlspath .. "/bin")
    if download_ret ~= 0 then
        vim.notify("download lombok failed")
    end
end