package layout

import (
	"bytes"
	"fmt"
	"io/ioutil"
	"text/template"
	"time"

	"github.com/goccy/go-yaml"
	"github.com/spf13/cast"
	tele "gopkg.in/tucnak/telebot.v3"
)

type (
	Layout struct {
		Config  map[string]interface{}
		Markups map[string]Markup
		Locales map[string]*template.Template

		DefaultLocale string
		LocaleFunc    LocaleFunc

		pref *tele.Settings
		ctx  tele.Context
	}

	Markup struct {
		tele.ReplyMarkup `yaml:",inline"`
		Keyboard         *template.Template `yaml:"-"`
		inline           bool
	}

	Button struct {
		tele.ReplyButton  `yaml:",inline"`
		tele.InlineButton `yaml:",inline"`
	}

	LocaleFunc func(tele.Recipient) string
)

func New(path string) (*Layout, error) {
	data, err := ioutil.ReadFile(path)
	if err != nil {
		return nil, err
	}

	var lt Layout
	return &lt, yaml.Unmarshal(data, &lt)
}

func (lt *Layout) Settings() tele.Settings {
	if lt.pref == nil {
		panic("telebot/layout: settings is empty")
	}
	return *lt.pref
}

func (lt *Layout) With(c tele.Context) tele.Layout {
	cp := *lt
	cp.ctx = c
	return &cp
}

func (lt *Layout) Get(k string) string {
	return fmt.Sprint(lt.Config[k])
}

func (lt *Layout) Int(k string) int {
	return cast.ToInt(lt.Config[k])
}

func (lt *Layout) Int64(k string) int64 {
	return cast.ToInt64(lt.Config[k])
}

func (lt *Layout) Float(k string) float64 {
	return cast.ToFloat64(lt.Config[k])
}

func (lt *Layout) Duration(k string) time.Duration {
	return cast.ToDuration(lt.Config[k])
}

func (lt *Layout) Text(k string, args ...interface{}) string {
	if lt.Locales == nil {
		return ""
	}

	tmpl, ok := lt.Locales[lt.Locale()]
	if !ok {
		return ""
	}

	var arg interface{}
	if len(args) > 0 {
		arg = args[0]
	}

	var buf bytes.Buffer
	if err := tmpl.ExecuteTemplate(&buf, k, arg); err != nil {
		// TODO: Log.
	}
	return buf.String()
}

func (lt *Layout) Markup(k string, args ...interface{}) *tele.ReplyMarkup {
	if lt.Markups == nil {
		return nil
	}

	markup, ok := lt.Markups[k]
	if !ok {
		return nil
	}

	var arg interface{}
	if len(args) > 0 {
		arg = args[0]
	}

	var buf bytes.Buffer
	if err := markup.Keyboard.Execute(&buf, arg); err != nil {
		// TODO: Log.
	}

	r := tele.ReplyMarkup{
		ForceReply:          markup.ForceReply,
		ResizeReplyKeyboard: markup.ResizeReplyKeyboard,
		OneTimeKeyboard:     markup.OneTimeKeyboard,
		ReplyKeyboardRemove: markup.ReplyKeyboardRemove,
		Selective:           markup.Selective,
	}

	if markup.inline {
		if err := yaml.Unmarshal(buf.Bytes(), &r.InlineKeyboard); err != nil {
			// TODO: Log.
		}
	} else {
		if err := yaml.Unmarshal(buf.Bytes(), &r.ReplyKeyboard); err != nil {
			// TODO: Log.
		}
	}

	return &r
}

func (lt *Layout) Locale() string {
	if lt.LocaleFunc != nil {
		locale := lt.LocaleFunc(lt.ctx.Sender())
		if locale != "" {
			return locale
		}
	}
	return lt.DefaultLocale
}