package i18n

import (
	"context"
	"git.noahlan.cn/noahlan/ntool/nlog"
	"golang.org/x/text/language"
)

var atTranslator *Translator

func getTranslator() *Translator {
	if atTranslator == nil {
		atTranslator = NewTranslator()
	}
	return atTranslator
}

// InitWithConfig 通过配置文件初始化I18N
func InitWithConfig(c Config) {
	Init(
		WithDefaultLanguage(c.Default),
		WithRootPath(c.RootPath),
		WithSortedParameterPrefix(c.SortedParameterPrefix),
	)
}

// Init 初始化I18N
func Init(opts ...Option) {
	atTranslator = NewTranslator(opts...)
}

// ResetOptions 重置Option
func ResetOptions(opts ...Option) {
	for _, opt := range opts {
		opt(getTranslator())
	}
}

// WithDefaultLanguage 设置默认语言
func WithDefaultLanguage(lng string) Option {
	return func(translator *Translator) {
		tag, err := language.Parse(lng)
		if err != nil {
			nlog.Errorf("parse lang err: %v", err)
			return
		}
		translator.DefaultLanguage = tag
	}
}

// WithRootPath 设置监听根目录
func WithRootPath(rootPath string) Option {
	return func(translator *Translator) {
		translator.RootPath = rootPath
	}
}

// WithFileLoader 设置文件加载器，一般使用默认值即可
func WithFileLoader(loader Loader) Option {
	return func(translator *Translator) {
		translator.FileLoader = loader
	}
}

// WithTagGetter 设置动态语言Tag获取器
func WithTagGetter(getter TagGetter) Option {
	return func(translator *Translator) {
		translator.TagGetter = getter
	}
}

// WithLocalizeConfigGetter 设置TransAny的LocalizeConfig获取器，默认会处理string和LocalizeConfig类型
func WithLocalizeConfigGetter(getter LocalizeConfigGetter) Option {
	return func(translator *Translator) {
		translator.LocalizeConfigGetter = getter
	}
}

// WithSortedParameterPrefix 设置自排序参数前缀,默认为'p'
func WithSortedParameterPrefix(prefix string) Option {
	return func(translator *Translator) {
		translator.SortedParameterPrefix = prefix
	}
}

// ConfigLanguages 动态配置acceptLanguages
func ConfigLanguages(acceptLanguages ...string) {
	getTranslator().configLocalizer(acceptLanguages...)
}

// Trans by message id
func Trans(ctx context.Context, messageID string) string {
	return getTranslator().Trans(ctx, messageID)
}

// TransWithParam by sorted string parameters
// params can be string or map[string]any
// all params must be same.
func TransWithParam(ctx context.Context, messageID string, params ...any) string {
	if len(params) == 0 {
		return messageID
	}
	p := &MessageWithParameter{MessageID: messageID}
	switch t := params[0].(type) {
	case map[string]any:
		p.ParamsWithName = t
	default:
		p.Params = params
	}
	msg, err := getTranslator().TransAny(ctx, p)
	if err != nil || msg == "" {
		return messageID
	}
	return msg
}

// TransAny by any parameter
/**
  param is one of these type: messageID, *i18n.LocalizeConfig
  Example:
	MustGetMessage("hello") // messageID is hello
	MustGetMessage(&i18n.LocalizeConfig{
			MessageID: "welcomeWithName",
			TemplateData: map[string]string{
				"name": context.Param("name"),
			},
	})
*/
func TransAny(ctx context.Context, param any) (string, error) {
	return getTranslator().TransAny(ctx, param)
}