package screens

import (
	"context"
	"strings"

	"github.com/NicoNex/echotron/v3"
	"github.com/TelegramExchange/tgex-backend/tg_bot/backend"
	"github.com/TelegramExchange/tgex-backend/tg_bot/bot"
	"github.com/TelegramExchange/tgex-backend/tg_bot/screens/ui"
	"github.com/rs/zerolog/log"
)

type Creatives struct {
	CurrentPage       int
	ProjectID         string
	ProjectTitle      string
	ProjectTelegramID int64
	ProjectUsername   string
	ProjectStatus     string
	BackState         bot.State
}

const creativesPerPage = 6
const creativesPerRow = 2

const msgNoCreatives = `
<b>Креативы</b>

У вас пока нет креативов

<i>Креатив — это рекламный материал:</i>
  ‣ Текст объявления
  ‣ Медиа контент (фото, видео)
  ‣ Шаблон для автопостинга
  ‣ Варианты для A/B тестирования

Начните с добавления первого креатива
`

const msgCreatives = `
<b>Креативы</b>

Управление рекламными материалами

Выберите креатив
`

func (s *Creatives) Enter(b *bot.Bot, mode bot.RenderMode) {
	page, err := b.Backend.GetCreatives(context.Background(), b.Session.JWT, b.Session.WorkspaceID, &s.ProjectID, false, s.CurrentPage+1, creativesPerPage)
	if err != nil {
		log.Error().Err(err).Msg("Failed to get creatives")
		b.SendNew("❌ Не удалось загрузить креативы", refreshKeyboard)
		return
	}

	text := msgCreatives
	if len(page.Items) == 0 {
		text = msgNoCreatives
	}

	var kbRows [][]echotron.InlineKeyboardButton

	rowsGrid := ui.BuildGrid(page.Items, creativesPerRow, creativesPerPage, page.Pages,
		func(creative backend.Creative) (string, string) { return creative.Name, "creative:" + creative.ID },
	)
	kbRows = append(kbRows, rowsGrid...)

	if navRow := ui.BuildNavigationRow(ui.PaginationConfig{
		CurrentPage:   s.CurrentPage,
		TotalPages:    page.Pages,
		MiddleButtons: Row(Button("＋ Добавить", "add_creative")),
	}); navRow != nil {
		kbRows = append(kbRows, navRow)
	}

	kbRows = append(kbRows, Row(Button("← Назад", "back"), Button("≡ Архив", "archive")))

	kb := Keyboard(kbRows...)
	b.Render(text, kb, mode)

	updateProjectHeaderMedia(b, b.LastMessageID, text, kb, s.ProjectTelegramID, s.ProjectTitle, s.ProjectUsername, s.ProjectStatus)
}

func (s *Creatives) HandleCallback(b *bot.Bot, u *echotron.Update) {
	if u.CallbackQuery == nil || u.CallbackQuery.Data == "" {
		return
	}

	data := u.CallbackQuery.Data

	switch {
	case data == "prev":
		if s.CurrentPage > 0 {
			s.CurrentPage--
		}
		s.Enter(b, bot.EditMessage)

	case data == "next":
		s.CurrentPage++
		s.Enter(b, bot.EditMessage)

	case data == "back":
		if s.BackState != nil {
			b.SetState(s.BackState, bot.EditMessage)
		}

	case data == "archive":
		b.Edit("📦 Архив креативов\n\nЭта функция в разработке", Keyboard(Row(Button("← Назад", "back"))))

	case data == "add_creative":
		b.SetState(&AddCreativeStart{ctx: &AddCreativeCtx{
			ProjectID: s.ProjectID,
			BackState: s,
		}}, bot.EditMessage)

	case strings.HasPrefix(data, "creative:"):
		creativeID, ok := strings.CutPrefix(data, "creative:")
		if !ok || creativeID == "" {
			return
		}

		b.SetState(&CreativeDetails{
			CreativeID: creativeID,
			ProjectID:  s.ProjectID,
			BackState:  s,
		}, bot.NewMessage)

	default:
		s.Enter(b, bot.NewMessage)
	}
	return
}

func (s *Creatives) HandleMessage(_ *bot.Bot, _ *echotron.Update) {}

func (s *Creatives) Handle(_ *bot.Bot, _ *echotron.Update) {}

func (s *Creatives) Exit() {}