package line

// Repository provides GORM-based persistence for LINE channel data.
// Reference: gochat's repository pattern (TikTok, WhatsApp repositories)
//
// Design: Repository pattern with GORM for LINE channel model persistence.
// - Create, FindByID, Update, Delete with soft-delete support
// - UpdateFields for partial updates using map[string]interface{}
// - List with account-level filtering for multi-tenant isolation

import (
	"context"

	"gorm.io/gorm"

	channelmodel "github.com/gochat/gochat/internal/model/channel"
)

// Repository handles LINE channel database operations.
type Repository struct {
	db *gorm.DB
}

// NewRepository creates a LINE channel repository instance.
func NewRepository(db *gorm.DB) *Repository {
	return &Repository{db: db}
}

// Create persists a new LINE channel record.
func (r *Repository) Create(ctx context.Context, channel *channelmodel.ChannelLINE) error {
	return r.db.WithContext(ctx).Create(channel).Error
}

// FindByID retrieves a LINE channel by primary key.
func (r *Repository) FindByID(ctx context.Context, id uint) (*channelmodel.ChannelLINE, error) {
	var ch channelmodel.ChannelLINE
	if err := r.db.WithContext(ctx).First(&ch, id).Error; err != nil {
		return nil, err
	}
	return &ch, nil
}

// FindByChannelID retrieves a LINE channel by its LINE Channel ID.
func (r *Repository) FindByChannelID(ctx context.Context, channelID string) (*channelmodel.ChannelLINE, error) {
	var ch channelmodel.ChannelLINE
	if err := r.db.WithContext(ctx).Where("channel_id = ?", channelID).First(&ch).Error; err != nil {
		return nil, err
	}
	return &ch, nil
}

// UpdateFields performs a partial update on a LINE channel record.
func (r *Repository) UpdateFields(ctx context.Context, id uint, fields map[string]interface{}) error {
	return r.db.WithContext(ctx).Model(&channelmodel.ChannelLINE{}).Where("id = ?", id).Updates(fields).Error
}

// Delete soft-deletes a LINE channel record (GORM soft-delete).
func (r *Repository) Delete(ctx context.Context, id uint) error {
	return r.db.WithContext(ctx).Delete(&channelmodel.ChannelLINE{}, id).Error
}

// List retrieves all LINE channels for a given account.
func (r *Repository) List(ctx context.Context, accountID uint) ([]channelmodel.ChannelLINE, error) {
	var channels []channelmodel.ChannelLINE
	if err := r.db.WithContext(ctx).Where("account_id = ?", accountID).Find(&channels).Error; err != nil {
		return nil, err
	}
	return channels, nil
}