package trans

import (
	"fmt"
	"os/exec"
	"strings"
	"log"
)


type transJob struct {
	word string
	fromLang string
	toLang string
}

func New(word, fromLang, toLang string) transJob {
	return transJob{word: word, fromLang: fromLang, toLang: toLang}
}

func (tj transJob) Translate() []string {
	outBytes, err := tj.execTrans()
	if err != nil {
		log.Fatal("Failed to execute command 'trans'!")
	}
	return uniqueSlice(parseTransOutput(string(outBytes)))
}

func (tj transJob) execTrans() ([]byte, error) {
	config := []string{
		"-no-ansi",
		"-show-original", "n",
		"-show-original-phonetics", "n",
		"-show-dictionary", "n",
		"-show-languages", "n",
		"-show-prompt-message", "n",
		fmt.Sprintf("%s:%s", tj.fromLang, tj.toLang),
		tj.word,
	}
	return exec.Command("trans", config...).Output()
}

func parseTransOutput(out string) []string {
	outLines := strings.Split(out, "\n")
	translation := outLines[0]

	additionalTranslations := strings.Split(outLines[len(outLines)-2], ",")
	for i, translation := range additionalTranslations {
		additionalTranslations[i] = strings.TrimSpace(translation)
	}

	return append([]string{translation}, additionalTranslations...)
}

func uniqueSlice(items []string) []string {
    encountered := map[string]bool{}

    uniqueSlice := []string{}
    for _, item := range items {
        if !encountered[item] {
            encountered[item] = true
            uniqueSlice = append(uniqueSlice, item)
        }
    }

    return uniqueSlice
}