package main

import (
	"archive/zip"
	"fmt"
	"io"
	"net/http"
	"os"
	"path/filepath"
	"runtime"
	"strings"
)

func GetHomeDir() string {
	homeDir, err := os.UserHomeDir()
	if err != nil {
		panic("get user home dir failed: " + err.Error())
	}
	return homeDir
}

func GetWorkDir() string {
	homeDir := GetHomeDir()
	return filepath.Join(homeDir, ".ja")
}

func DefaultVmOptionDir() string {
	homeDir := GetHomeDir()
	if runtime.GOOS == "windows" {
		return filepath.Join(homeDir, "AppData/Roaming/JetBrains")
	}
	return filepath.Join(homeDir, ".config/JetBrains")
}

func DownloadJaNetfilter() {
	homeDir := GetWorkDir()
	filename := filepath.Join(homeDir, "ja-netfilter-2022.2.0.zip")
	if _, err := os.Stat(filename); os.IsNotExist(err) {
		url := "https://gitee.com/xuthus5/ja-netfilter/releases/download/v1.0.0/ja-netfilter.zip"
		err := downloadFile(url, filename)
		if err != nil {
			panic("download ja-netfilter failed: " + err.Error())
		}
	}
}

func UnzipJaNetfilter() {
	homeDir := GetWorkDir()
	jaNetfilterDir := filepath.Join(homeDir, "ja-netfilter")
	if _, err := os.Stat(jaNetfilterDir); os.IsNotExist(err) {
		filename := filepath.Join(homeDir, "ja-netfilter-2022.2.0.zip")
		reader, err := zip.OpenReader(filename)
		if err != nil {
			panic("open zip failed: " + err.Error())
		}
		defer reader.Close()

		for _, file := range reader.File {
			filePath := filepath.Join(homeDir, file.Name)
			if !strings.HasPrefix(filePath, filepath.Clean(homeDir)+string(os.PathSeparator)) {
				panic(fmt.Sprintf("illegal file path: %s", filePath))
			}

			if file.FileInfo().IsDir() {
				if err := os.MkdirAll(filePath, os.ModePerm); err != nil {
					panic("create dir failed: " + err.Error())
				}
				continue
			}

			if err := os.MkdirAll(filepath.Dir(filePath), os.ModePerm); err != nil {
				panic("create dir failed: " + err.Error())
			}

			if err := unzipFile(file, filePath); err != nil {
				panic("unzip file failed: " + err.Error())
			}
		}
	}
}

func unzipFile(f *zip.File, fpath string) error {
	rc, err := f.Open()
	if err != nil {
		return err
	}
	defer rc.Close()

	outFile, err := os.OpenFile(fpath, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, f.Mode())
	if err != nil {
		return err
	}
	defer outFile.Close()

	_, err = io.Copy(outFile, rc)
	if err != nil {
		return err
	}
	return nil
}

func downloadFile(url string, filepath string) error {
	// 创建HTTP请求
	resp, err := http.Get(url)
	if err != nil {
		return err
	}
	defer resp.Body.Close()

	// 创建文件
	out, err := os.Create(filepath)
	if err != nil {
		return err
	}
	defer out.Close()

	// 将HTTP响应的内容写入文件
	_, err = io.Copy(out, resp.Body)
	if err != nil {
		return err
	}

	return nil
}

func InjectVmOption(dirname, vmOptionFilename, vmOptionDir string) {
	if runtime.GOOS == "windows" {
		vmOptionFilename += ".exe.vmoptions"
	} else {
		vmOptionFilename += ".vmoptions"
	}
	logger.Printf("inject ide name: %s, vm option: %s", dirname, filepath.Join(vmOptionDir, dirname, vmOptionFilename))
	var jaNetfilterFilename = "-javaagent:" + filepath.Join(GetWorkDir(), "ja-netfilter", "ja-netfilter.jar")
	vmFile := filepath.Join(vmOptionDir, dirname, vmOptionFilename)
	readFile, err := os.ReadFile(vmFile)
	if err != nil {
		panic("read vm file failed: " + err.Error())
	}
	var vmString = string(readFile)
	if !strings.Contains(vmString, "--add-opens=java.base/jdk.internal.org.objectweb.asm=ALL-UNNAMED") {
		vmString += "\n--add-opens=java.base/jdk.internal.org.objectweb.asm=ALL-UNNAMED"
	}
	if !strings.Contains(vmString, "--add-opens=java.base/jdk.internal.org.objectweb.asm.tree=ALL-UNNAMED") {
		vmString += "\n--add-opens=java.base/jdk.internal.org.objectweb.asm.tree=ALL-UNNAMED"
	}
	if !strings.Contains(vmString, jaNetfilterFilename) {
		vmString += "\n" + jaNetfilterFilename
	}
	err = os.WriteFile(vmFile, []byte(vmString), 0644)
	if err != nil {
		panic("write vm file failed: " + err.Error())
	}
}