package mongodb

import (
	"context"
	"git.aiterp.net/rpdata/api/models"
	"github.com/globalsign/mgo"
	"github.com/globalsign/mgo/bson"
)

func newChannelRepository(db *mgo.Database) (*channelRepository, error) {
	collection := db.C("common.channels")

	err := collection.EnsureIndexKey("logged")
	if err != nil {
		return nil, err
	}
	err = collection.EnsureIndexKey("event")
	if err != nil {
		return nil, err
	}
	err = collection.EnsureIndexKey("location")
	if err != nil {
		return nil, err
	}

	return &channelRepository{
		channels: collection,
	}, nil
}

type channelRepository struct {
	channels *mgo.Collection
}

func (r *channelRepository) Find(ctx context.Context, name string) (*models.Channel, error) {
	channel := new(models.Channel)
	err := r.channels.FindId(name).One(channel)
	if err != nil {
		return nil, err
	}

	return channel, nil
}

func (r *channelRepository) List(ctx context.Context, filter models.ChannelFilter) ([]*models.Channel, error) {
	query := bson.M{}
	if filter.Logged != nil {
		query["logged"] = *filter.Logged
	}
	if filter.EventName != nil {
		query["eventName"] = *filter.EventName
	}
	if filter.LocationName != nil {
		query["locationName"] = *filter.LocationName
	}
	if len(filter.Names) > 0 {
		query["_id"] = bson.M{"$in": filter.Names}
	}

	channels := make([]*models.Channel, 0, 32)
	err := r.channels.Find(query).Limit(filter.Limit).Sort("_id").All(&channels)
	if err != nil {
		if err == mgo.ErrNotFound {
			return channels, nil
		}

		return nil, err
	}

	return channels, nil
}

func (r *channelRepository) Insert(ctx context.Context, channel models.Channel) (*models.Channel, error) {
	err := r.channels.Insert(channel)
	if err != nil {
		return nil, err
	}

	return &channel, nil
}

func (r *channelRepository) Update(ctx context.Context, channel models.Channel, update models.ChannelUpdate) (*models.Channel, error) {
	updateBson := bson.M{}
	if update.Logged != nil {
		updateBson["logged"] = *update.Logged
		channel.Logged = *update.Logged
	}
	if update.LocationName != nil {
		updateBson["locationName"] = *update.LocationName
		channel.LocationName = *update.LocationName
	}
	if update.EventName != nil {
		updateBson["eventName"] = *update.EventName
		channel.EventName = *update.EventName
	}

	err := r.channels.UpdateId(channel.Name, bson.M{"$set": updateBson})
	if err != nil {
		return nil, err
	}

	return &channel, nil
}

func (r *channelRepository) Remove(ctx context.Context, channel models.Channel) error {
	return r.channels.RemoveId(channel.Name)
}