package trans

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


type Translation struct {
	Word string
	Language string
	Translator func(string, string, string) (string, error)
	Identifier func(string) (string, error)
}

func New(word string) Translation {
	return Translation{
		Word: word,
		Language: "",
		Translator: executeTrans,
		Identifier: executeIdentify,
	}
}

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

func (t Translation) Translate(toLang string) []string {
	output, err := t.Translator(t.Word, t.Language, toLang)
	if err != nil {
		panic(err)
	}
	return parseTransOutput(output)
}

func parseTransOutput(out string) []string {
	re := regexp.MustCompile(`(?m)^\s{4}\w.*$`)
	lineMatches := re.FindAllString(out, -1)

	results := []string{strings.Split(out, "\n")[0]}
	for _, line := range lineMatches {
		for _, word := range strings.Split(strings.TrimSpace(line), ",") {
			results = append(results, strings.TrimSpace(word))
		}
	}
	return uniqueSlice(results)
}

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
}

func executeIdentify(word string) (string, error) {
	config := []string{
		"-no-ansi",
		"-id",
		word,
	}
	outBytes, err := exec.Command("trans", config...).Output()
	return string(outBytes), err
}

func (t Translation) Identify() string {
	output, err := t.Identifier(t.Word)
	if err != nil {
		panic(err)
	}
	return parseTransIdentifyOutput(output)
}

func parseTransIdentifyOutput(out string) string {
	re := regexp.MustCompile(`(?m)^Code\s+(\w+)$`)
	result := ""
	matches := re.FindStringSubmatch(out)
	if (len(matches) >= 2) {
		result = matches[1]
	}
	return result
}