package i18n

import (
	"embed"
	"encoding/json"

	"github.com/nicksnyder/go-i18n/v2/i18n"
	"github.com/rs/zerolog/log"
	"golang.org/x/text/language"
)

//go:embed translations/*.json
var translationFS embed.FS

// Bundle is the global i18n bundle
var Bundle *i18n.Bundle

// SupportedLanguages lists all supported language codes
var SupportedLanguages = []string{"en", "es", "fr", "de", "pt", "it", "ja", "ko", "nl", "zh"}

// DefaultLanguage is the fallback language
const DefaultLanguage = "en"

// Init initializes the i18n bundle with embedded translation files
func Init() error {
	Bundle = i18n.NewBundle(language.English)
	Bundle.RegisterUnmarshalFunc("json", json.Unmarshal)

	// Load all translation files
	for _, lang := range SupportedLanguages {
		path := "translations/" + lang + ".json"
		data, err := translationFS.ReadFile(path)
		if err != nil {
			log.Warn().Str("language", lang).Err(err).Msg("Failed to load translation file")
			continue
		}
		Bundle.MustParseMessageFileBytes(data, path)
		log.Info().Str("language", lang).Msg("Loaded translation file")
	}

	return nil
}

// NewLocalizer creates a new localizer for the given language tags
func NewLocalizer(langs ...string) *i18n.Localizer {
	return i18n.NewLocalizer(Bundle, langs...)
}

// T translates a message ID with optional template data
func T(localizer *i18n.Localizer, messageID string, templateData map[string]interface{}) string {
	if localizer == nil {
		localizer = NewLocalizer(DefaultLanguage)
	}

	msg, err := localizer.Localize(&i18n.LocalizeConfig{
		MessageID:    messageID,
		TemplateData: templateData,
	})
	if err != nil {
		// Fallback to message ID if translation not found
		log.Debug().Str("message_id", messageID).Err(err).Msg("Translation not found")
		return messageID
	}
	return msg
}

// TSimple translates a message ID without template data
func TSimple(localizer *i18n.Localizer, messageID string) string {
	return T(localizer, messageID, nil)
}

// MustT translates a message ID or panics
func MustT(localizer *i18n.Localizer, messageID string, templateData map[string]interface{}) string {
	if localizer == nil {
		localizer = NewLocalizer(DefaultLanguage)
	}

	msg, err := localizer.Localize(&i18n.LocalizeConfig{
		MessageID:    messageID,
		TemplateData: templateData,
	})
	if err != nil {
		panic(err)
	}
	return msg
}