package service

import (
	"context"

	channelmodel "github.com/gochat/gochat/internal/model/channel"
	"github.com/gochat/gochat/internal/repository"
	applogger "github.com/gochat/gochat/pkg/logger"
)

// ChannelLINEService implements business logic for LINE channel operations.
// Reference: LINE Messaging API — https://developers.line.biz/en/docs/messaging-api/
//
// LINE Official Account channels use the LINE Messaging API to send/receive
// messages via a connected LINE Official Account. The Channel Access Token grants
// messaging permissions for LINE interactions.
type ChannelLINEService struct {
	repo *repository.ChannelLINERepo
}

// NewChannelLINEService creates a new ChannelLINE service.
func NewChannelLINEService(repo *repository.ChannelLINERepo) *ChannelLINEService {
	return &ChannelLINEService{repo: repo}
}

// GetByID retrieves a LINE channel by ID.
func (s *ChannelLINEService) GetByID(ctx context.Context, id uint) (*channelmodel.ChannelLINE, error) {
	return s.repo.FindByID(ctx, id)
}

// GetByChannelID retrieves a LINE channel by LINE Channel ID.
func (s *ChannelLINEService) GetByChannelID(ctx context.Context, channelID string) (*channelmodel.ChannelLINE, error) {
	return s.repo.FindByChannelID(ctx, channelID)
}

// Create inserts a new LINE channel record.
func (s *ChannelLINEService) Create(ctx context.Context, ch *channelmodel.ChannelLINE) error {
	if err := s.repo.Create(ctx, ch); err != nil {
		applogger.L().Errorf("Failed to create LINE channel: %v", err)
		return err
	}
	applogger.L().Infof("LINE channel created: id=%d channel_id=%s", ch.ID, ch.ChannelID)
	return nil
}

// Update modifies an existing LINE channel.
func (s *ChannelLINEService) Update(ctx context.Context, ch *channelmodel.ChannelLINE) error {
	if err := s.repo.Update(ctx, ch); err != nil {
		applogger.L().Errorf("Failed to update LINE channel: %v", err)
		return err
	}
	return nil
}

// Delete soft-deletes a LINE channel.
func (s *ChannelLINEService) Delete(ctx context.Context, id uint) error {
	if err := s.repo.Delete(ctx, id); err != nil {
		applogger.L().Errorf("Failed to delete LINE channel: %v", err)
		return err
	}
	applogger.L().Infof("LINE channel deleted: id=%d", id)
	return nil
}

// List retrieves all LINE channels.
func (s *ChannelLINEService) List(ctx context.Context) ([]channelmodel.ChannelLINE, error) {
	return s.repo.List(ctx)
}

// ListByAccount retrieves all LINE channels for a given account.
func (s *ChannelLINEService) ListByAccount(ctx context.Context, accountID uint) ([]channelmodel.ChannelLINE, error) {
	return s.repo.ListByAccount(ctx, accountID)
}