// URTator - Urban Terror server browser and game launcher, written in
// Go.
//
// Copyright (c) 2016-2017, Stanislav N. aka pztrn.
// All rights reserved.
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

// +build !windows

package translator

import (
    // stdlib
    "errors"
    "fmt"
    "os"
    "path/filepath"
    "strings"
)

// Detect language on Unices.
func (t *Translator) detectLanguage() {
    // Use LC_ALL first.
    t.Language = os.Getenv("LC_ALL")
    // If LC_ALL is empty - use LANG.
    if t.Language == "" {
        t.Language = os.Getenv("LANG")
    }

    // If still nothing - force "en_US" as default locale. Otherwise
    // split language string by "." and take first part.
    // Note: en_US is a default thing, so you will not found anything
    // in "translations" directory!
    if t.Language == "" {
        fmt.Println("No locale data for current user found, using default (en_US)...")
        t.Language = "en_US"
    } else {
        t.Language = strings.Split(t.Language, ".")[0]
    }
}

func (t *Translator) detectTranslationsDirectory() error {
    // Try to use directory near binary.
    dir, _ := filepath.Abs(filepath.Dir(os.Args[0]))
    // ..which can be overriden by URTRATOR_BINDIR environment variable.
    // Useful for developers.
    envdir := os.Getenv("URTRATOR_BINDIR")
    if envdir != "" {
        dir = envdir
    }

    translations_dir := filepath.Join(dir, "translations")
    _, err := os.Stat(translations_dir)
    if err != nil {
        fmt.Println("Translations wasn't found near binary!")
        // As we're using JSON translation storage, it should be
        // put in /usr/share/urtrator/translations by package
        // maintainers in distros.
        fmt.Println("Trying /usr/share/urtrator/translations...")
        _, err := os.Stat("/usr/share/urtrator/translations")
        if err != nil {
            t.Language = "en_US"
            fmt.Println("Translations unavailable, forcing en_US language code")
        } else {
            t.translationsPath = "/usr/share/urtrator/translations"
        }
    } else {
        t.translationsPath = translations_dir
    }

    if t.translationsPath != "" {
        t.translationsPath = filepath.Join(t.translationsPath, t.Language)
    } else {
        return errors.New("No translations directory was detected!")
    }

    return nil
}