package screens

import (
	"context"
	"fmt"
	"strings"
	"time"

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

type PlacementDetails struct {
	WorkspaceID string
	ProjectID   string
	PlacementID string
	BackState   bot.State
}

func (s *PlacementDetails) Enter(b *bot.Bot, mode bot.RenderMode) {
	jwt := b.Session.JWT
	if jwt == "" {
		log.Error().Msg("JWT is empty in session")
		b.SendNew("❌ Ошибка авторизации. Попробуйте /start", Keyboard())
		return
	}

	s.renderDetails(b, mode, jwt)
}

func (s *PlacementDetails) renderDetails(b *bot.Bot, mode bot.RenderMode, jwt string) {
	placement, err := b.Backend.GetPlacement(
		context.Background(),
		jwt,
		s.WorkspaceID,
		s.ProjectID,
		s.PlacementID,
	)
	if err != nil {
		log.Error().Err(err).Msg("Failed to get placement")
		b.SendNew("❌ Не удалось загрузить размещение", Keyboard())
		return
	}

	text := "<b>Детали размещения</b>\n\n"

	channelName := formatChannelName(placement.Channel)
	text += fmt.Sprintf("• <b>Канал:</b> %s\n", channelName)
	text += fmt.Sprintf("• <b>Статус:</b> %s\n", formatPlacementStatus(placement.Status))
	text += fmt.Sprintf("• <b>Ссылка:</b> %s\n", formatInviteLinkType(placement.InviteLinkType))

	if placement.Details != nil {
		if placement.Details.PlacementType != nil {
			text += fmt.Sprintf("• <b>Тип:</b> %s\n", formatPlacementType(*placement.Details.PlacementType))
		}
		if placement.Details.PlacementAt != nil && *placement.Details.PlacementAt != "" {
			text += fmt.Sprintf("• <b>Дата размещения:</b> %s\n", formatDateTime(*placement.Details.PlacementAt))
		}
		if placement.Details.PaymentAt != nil && *placement.Details.PaymentAt != "" {
			text += fmt.Sprintf("• <b>Дата оплаты:</b> %s\n", formatDateTime(*placement.Details.PaymentAt))
		}
		if placement.Details.Cost != nil {
			text += fmt.Sprintf("• <b>Стоимость:</b> %s %.0f₽\n",
				formatCostType(placement.Details.Cost.Type),
				placement.Details.Cost.Value,
			)
		}
		if placement.Details.CostBeforeBargain != nil {
			text += fmt.Sprintf("• <b>До торга:</b> %.0f₽\n", *placement.Details.CostBeforeBargain)
		}
		if placement.Details.Format != nil && *placement.Details.Format != "" {
			text += fmt.Sprintf("• <b>Формат:</b> %s\n", *placement.Details.Format)
		}
		if placement.Details.Comment != nil && *placement.Details.Comment != "" {
			text += fmt.Sprintf("• <b>Комментарий:</b> %s\n", *placement.Details.Comment)
		}
	}

	keyboard := Keyboard(Row(Button("← Назад", "back")))
	b.Render(text, keyboard, mode)
}

func formatChannelName(channel backend.Channel) string {
	if channel.Title != nil && *channel.Title != "" {
		return *channel.Title
	}
	if channel.Username != nil && *channel.Username != "" {
		return "@" + *channel.Username
	}
	return "Без названия"
}

func formatInviteLinkType(value string) string {
	if value == "approval" {
		return "с одобрением"
	}
	return "публичная"
}

func formatPlacementStatus(status string) string {
	normalized := strings.TrimSpace(strings.ToLower(status))
	switch normalized {
	case "planned":
		return "Планируется"
	case "approved":
		return "Согласовано"
	case "rejected":
		return "Отклонено"
	case "in_progress":
		return "В работе"
	case "completed":
		return "Размещено"
	default:
		return status
	}
}

func formatPlacementType(value string) string {
	normalized := strings.TrimSpace(strings.ToLower(value))
	switch normalized {
	case "self_promo":
		return "Самопиар"
	case "standard":
		return "Стандарт"
	default:
		return value
	}
}

func formatCostType(value string) string {
	switch strings.TrimSpace(strings.ToLower(value)) {
	case "cpm":
		return "СРМ"
	default:
		return "Фикс"
	}
}

func formatDateTime(value string) string {
	if value == "" {
		return value
	}
	if parsed, err := time.Parse(time.RFC3339, value); err == nil {
		return parsed.Format("02.01.2006 15:04")
	}
	if parsed, err := time.Parse(time.RFC3339Nano, value); err == nil {
		return parsed.Format("02.01.2006 15:04")
	}
	return value
}

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

	switch u.CallbackQuery.Data {
	case "back":
		if s.BackState != nil {
			b.SetState(s.BackState, bot.EditMessage)
		}
	default:
		s.Enter(b, bot.NewMessage)
	}
}

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

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

func (s *PlacementDetails) Exit() {}