package main

import (
	"bufio"
	"encoding/json"
	"fmt"
	"io/ioutil"
	"net/http"
	"os"
	"time"
)

func main() {
	fmt.Printf("Minecraft Username Lookup -- by MrMelon\n")
	if len(os.Args) > 1 {
		for i := 1; i < len(os.Args); i++ {
			fmt.Printf("Find: " + os.Args[i])
			result, err := lookup(os.Args[i])
			if err != nil {
				fmt.Printf("\rFail: %s\n", os.Args[i])
				fmt.Fprintln(os.Stderr, "Internal error:", err)
				continue
			}
			fmt.Printf("\rDone: %s -- %s\n", result.Data.Player.ID, result.Data.Player.Username)
		}
	}
	fi, _ := os.Stdin.Stat()

	if (fi.Mode() & os.ModeCharDevice) == 0 {
		scanner := bufio.NewScanner(os.Stdin)
		for scanner.Scan() {
			fmt.Printf("Find: " + scanner.Text())
			result, err := lookup(scanner.Text())
			if err != nil {
				fmt.Printf("\rFail: %s\n", scanner.Text())
				fmt.Fprintln(os.Stderr, "Internal error:", err)
				continue
			}
			fmt.Printf("\rDone: %s -- %s\n", result.Data.Player.ID, result.Data.Player.Username)
		}
		if err := scanner.Err(); err != nil {
			fmt.Fprintln(os.Stderr, "Failed to read pipe:", err)
		}
	}
}

// APIResponse is used to parse the data from the api.
type APIResponse struct {
	Data struct {
		Player APIPlayerData `json:"player"`
	} `json:"data"`
}

// APIPlayerData is used to store player object.
type APIPlayerData struct {
	Username string `json:"username"`
	ID       string `json:"id"`
	Avatar   string `json:"avatar"`
}

func lookup(uuid string) (*APIResponse, error) {
	var err error
	data := &APIResponse{}

	bytes, err := request("https://playerdb.co/api/player/minecraft/" + uuid)
	if err != nil {
		return nil, err
	}

	err = json.Unmarshal(bytes, data)
	if err != nil {
		return nil, err
	}

	return data, err
}

func request(url string) ([]byte, error) {
	var body []byte

	mclookupClient := http.Client{
		Timeout: time.Second * 2,
	}

	req, err := http.NewRequest(http.MethodGet, url, nil)
	if err != nil {
		return body, err
	}

	req.Header.Set("User-Agent", "mclookup")

	res, err := mclookupClient.Do(req)
	if err != nil {
		return body, err
	}

	if res.Body != nil {
		defer res.Body.Close()
	}

	body, err = ioutil.ReadAll(res.Body)
	if err != nil {
		return body, err
	}
	return body, nil
}