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

function IsWindows()
    local delimeter = package.config:sub(1, 1)
    if delimeter == "/" then
        return false
    end
    return true
end

function Path2Windows(path)
    return (string.gsub(path, "/", "\\"))
end

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

local homepage = os.getenv("HOME")
if IsWindows() then
    homepage = os.getenv("USERPROFILE")
end

local jdtlspath = homepage .. "/.jdtls"
local jdtls_bin = jdtlspath .. "/bin/jdtls"
local lombok_jar = jdtlspath .. "/bin/lombok.jar"
local temp_download = os.getenv("TEMP")

if IsWindows() then
    jdtlspath = Path2Windows(jdtlspath)
    jdtls_bin = Path2Windows(jdtls_bin)
    lombok_jar = Path2Windows(lombok_jar)
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(jdtls_bin) then
    print("download jdtls binary")
    local download_ret = os.execute(
        "curl --create-dirs -O --output-dir "
        .. temp_download
        .. " https://download.eclipse.org/jdtls/milestones/1.23.0/jdt-language-server-1.23.0-202304271346.tar.gz"
    )
    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 " .. temp_download .. "/jdt-language-server-1.23.0-202304271346.tar.gz -C " .. jdtlspath)
    if tar_ret ~= 0 then
        vim.notify("extract jdtls file failed")
        return
    end
    vim.notify("install jdtls success")
end

-- 下载lombok
if not IsFileExist(lombok_jar) then
    vim.notify("download lombok.jar")
    local download_ret = os.execute(
        "curl --create-dirs -O --output-dir " .. jdtlspath .. "/bin https://projectlombok.org/downloads/lombok.jar"
    )
    if download_ret ~= 0 then
        vim.notify("download lombok failed")
    end
    vim.notify("download lombok.jar success")
end