package scenarios

import (
	"io/ioutil"
	"os"
	"os/exec"
	"path/filepath"
	"runtime"
	"time"

	_ "github.com/v2ray/v2ray-core/app/router/rules"
	"github.com/v2ray/v2ray-core/common/log"

	// The following are necessary as they register handlers in their init functions.
	_ "github.com/v2ray/v2ray-core/proxy/blackhole"
	_ "github.com/v2ray/v2ray-core/proxy/dokodemo"
	_ "github.com/v2ray/v2ray-core/proxy/freedom"
	_ "github.com/v2ray/v2ray-core/proxy/http"
	_ "github.com/v2ray/v2ray-core/proxy/shadowsocks"
	_ "github.com/v2ray/v2ray-core/proxy/socks"
	_ "github.com/v2ray/v2ray-core/proxy/vmess/inbound"
	_ "github.com/v2ray/v2ray-core/proxy/vmess/outbound"
)

var (
	runningServers = make([]*exec.Cmd, 0, 10)

	binaryPath string
)

func BuildV2Ray() error {
	if len(binaryPath) > 0 {
		return nil
	}

	dir, err := ioutil.TempDir("", "v2ray")
	if err != nil {
		return err
	}
	binaryPath = filepath.Join(dir, "v2ray")
	if runtime.GOOS == "windows" {
		binaryPath += ".exe"
	}
	cmd := exec.Command("go", "build", "-tags=json", "-o="+binaryPath, filepath.Join("github.com", "v2ray", "v2ray-core", "release", "server"))
	return cmd.Run()
}

func TestFile(filename string) string {
	return filepath.Join(os.Getenv("GOPATH"), "src", "github.com", "v2ray", "v2ray-core", "testing", "scenarios", "data", filename)
}

func InitializeServerSetOnce(testcase string) error {
	if err := InitializeServerServer(testcase); err != nil {
		return err
	}
	if err := InitializeServerClient(testcase); err != nil {
		return err
	}
	return nil
}

func InitializeServerServer(testcase string) error {
	return InitializeServer(TestFile(testcase + "_server.json"))
}

func InitializeServerClient(testcase string) error {
	return InitializeServer(TestFile(testcase + "_client.json"))
}

func InitializeServer(configFile string) error {
	err := BuildV2Ray()
	if err != nil {
		return err
	}

	proc := exec.Command(binaryPath, "-config="+configFile)
	proc.Stderr = os.Stderr
	proc.Stdout = os.Stdout

	err = proc.Start()
	if err != nil {
		return err
	}

	time.Sleep(time.Second)

	runningServers = append(runningServers, proc)

	return nil
}

func CloseAllServers() {
	log.Info("Closing all servers.")
	for _, server := range runningServers {
		server.Process.Kill()
	}
	runningServers = make([]*exec.Cmd, 0, 10)
	log.Info("All server closed.")
}