package repository

import (
	"context"
	"fmt"
	"net/url"

	"git.cryptic.systems/volker.raschek/flucky/pkg/repository/postgres"
	"git.cryptic.systems/volker.raschek/flucky/pkg/repository/sqlite3"
	"git.cryptic.systems/volker.raschek/flucky/pkg/types"
	"git.cryptic.systems/volker.raschek/go-logger"
)

type Repository interface {
	AddDevices(ctx context.Context, devices ...*types.Device) error
	AddMeasuredValues(ctx context.Context, measuredValues ...*types.MeasuredValue) error
	AddOrUpdateDevices(ctx context.Context, devices ...*types.Device) error
	AddOrUpdateMeasuredValues(ctx context.Context, measuredValues ...*types.MeasuredValue) error
	AddOrUpdateSensors(ctx context.Context, sensors ...*types.Sensor) error
	AddSensors(ctx context.Context, sensors ...*types.Sensor) error
	Close() error
	GetDeviceByID(ctx context.Context, deviceID string) (*types.Device, error)
	GetDeviceByName(ctx context.Context, name string) (*types.Device, error)
	GetDevices(ctx context.Context) ([]*types.Device, error)
	GetHumidities(ctx context.Context) ([]*types.MeasuredValue, error)
	GetHumidityByID(ctx context.Context, id string) (*types.MeasuredValue, error)
	GetPressureByID(ctx context.Context, id string) (*types.MeasuredValue, error)
	GetPressures(ctx context.Context) ([]*types.MeasuredValue, error)
	GetSensorByID(ctx context.Context, sensorID string) (*types.Sensor, error)
	GetSensorsByDeviceIDs(ctx context.Context, deviceIDs ...string) ([]*types.Sensor, error)
	GetSensorsByModels(ctx context.Context, sensorModels ...string) ([]*types.Sensor, error)
	GetSensorsByNames(ctx context.Context, sensorModels ...string) ([]*types.Sensor, error)
	GetSensors(ctx context.Context) ([]*types.Sensor, error)
	GetTemperatureByID(ctx context.Context, id string) (*types.MeasuredValue, error)
	GetTemperatures(ctx context.Context) ([]*types.MeasuredValue, error)
	Migrate(ctx context.Context) error
	RemoveDevicesByIDs(ctx context.Context, deviceIDs ...string) error
	RemoveDevicesByNames(ctx context.Context, names ...string) error
	RemoveSensorsByIDs(ctx context.Context, sensorIDs ...string) error
	RemoveSensorsByNames(ctx context.Context, names ...string) error
	UpdateDevices(ctx context.Context, devices ...*types.Device) error
	UpdateSensors(ctx context.Context, sensors ...*types.Sensor) error
}

// New returns a new database backend interface
func New(databaseURL *url.URL, flogger logger.Logger) (Repository, error) {
	switch databaseURL.Scheme {
	case "postgres":
		repo, err := postgres.New(postgres.Opts{
			DatabaseURL: databaseURL,
			Logger:      flogger,
		})
		if err != nil {
			return nil, err
		}

		// Initialize database scheme if not exists
		err = repo.Migrate(context.Background())
		if err != nil {
			return nil, err
		}

		return repo, nil

	case "sqlite3":
		repo, err := sqlite3.New(sqlite3.Opts{
			DatabaseURL: databaseURL,
			Logger:      flogger,
		})
		if err != nil {
			return nil, err
		}

		// Initialize database scheme if not exists
		err = repo.Migrate(context.Background())
		if err != nil {
			return nil, err
		}

		return repo, nil

	default:
		return nil, fmt.Errorf("Unsupported repository scheme: %v", databaseURL.Scheme)
	}
}

// Repository represent a repository where all devices, sensors and measured
// values are stored.
// type Repository struct {
// 	database db.Database
// }

// // AddDevices to the repository
// func (repo *Repository) AddDevices(devices ...*types.Device) error {
// 	return repo.database.InsertDevices(context.Background(), devices...)
// }

// // AddMeasuredValues to the repository
// func (repo *Repository) AddMeasuredValues(measuredValues ...*types.MeasuredValue) error {
// 	return repo.database.InsertMeasuredValues(context.Background(), measuredValues...)
// }

// // AddOrUpdateDevices to the repository
// func (repo *Repository) AddOrUpdateDevices(devices ...*types.Device) error {
// 	return repo.database.InsertOrUpdateDevices(context.Background(), devices...)
// }

// // AddOrUpdateMeasuredValues to the repository
// func (repo *Repository) AddOrUpdateMeasuredValues(measuredValues ...*types.MeasuredValue) error {
// 	return repo.database.InsertOrUpdateMeasuredValues(context.Background(), measuredValues...)
// }

// // AddOrUpdateSensors to the repository
// func (repo *Repository) AddOrUpdateSensors(sensors ...*types.Sensor) error {
// 	return repo.database.InsertOrUpdateSensors(context.Background(), sensors...)
// }

// // AddSensors to the repository
// func (repo *Repository) AddSensors(sensors ...*types.Sensor) error {
// 	return repo.database.InsertSensors(context.Background(), sensors...)
// }

// // Close closes the repository and prevents new queries from starting. Close
// // then waits for all queries that have started processing on the server to
// // finish.
// func (repo *Repository) Close() error {
// 	return repo.database.Close()
// }

// // DisableSensorsByNames disable all sensors which match bei their name
// func (repo *Repository) DisableSensorsByNames(sensorNames ...string) error {
// 	sensors, err := repo.GetSensors()
// 	if err != nil {
// 		return err
// 	}

// 	matchedSensors := make([]*types.Sensor, 0)
// 	for _, sensor := range sensors {
// 		for _, sensorName := range sensorNames {
// 			if strings.Compare(sensor.Name, sensorName) == 0 {
// 				sensor.Enabled = false
// 				matchedSensors = append(matchedSensors, sensor)
// 			}
// 		}
// 	}

// 	return repo.UpdateSensors(matchedSensors...)
// }

// // EnableSensorsByNames enable all sensors which match bei their name
// func (repo *Repository) EnableSensorsByNames(sensorNames ...string) error {
// 	sensors, err := repo.GetSensors()
// 	if err != nil {
// 		return err
// 	}

// 	matchedSensors := make([]*types.Sensor, 0)
// 	for _, sensor := range sensors {
// 		for _, sensorName := range sensorNames {
// 			if strings.Compare(sensor.Name, sensorName) == 0 {
// 				sensor.Enabled = true
// 				matchedSensors = append(matchedSensors, sensor)
// 			}
// 		}
// 	}

// 	return repo.UpdateSensors(matchedSensors...)
// }

// // GetDevice returns a device by his id. If no device has been found, the
// // function returns nil.
// func (repo *Repository) GetDevice(deviceID string) (*types.Device, error) {
// 	return repo.database.SelectDevice(context.Background(), deviceID)
// }

// // GetDevices returns all devices. If no devices has been found, the function
// // returns nil.
// func (repo *Repository) GetDevices() ([]*types.Device, error) {
// 	return repo.database.SelectDevices(context.Background())
// }

// // GetHumidity returns a humidity value by id
// func (repo *Repository) GetHumidity(humidityID string) (*types.MeasuredValue, error) {
// 	return repo.database.SelectHumidity(context.Background(), humidityID)
// }

// // GetPressure returns a pressure value by id
// func (repo *Repository) GetPressure(pressureID string) (*types.MeasuredValue, error) {
// 	return repo.database.SelectPressure(context.Background(), pressureID)
// }

// // GetSensor returns a sensor by his id. If no sensor has been found, the
// // function returns nil.
// func (repo *Repository) GetSensor(sensorID string) (*types.Sensor, error) {
// 	return repo.database.SelectSensor(context.Background(), sensorID)
// }

// // GetSensors returns all sensors. If no sensors has been found, the function
// // returns nil.
// func (repo *Repository) GetSensors(models ...string) ([]*types.Sensor, error) {
// 	sensors, err := repo.database.SelectSensors(context.Background())
// 	switch {
// 	case err != nil:
// 		return nil, err
// 	case len(models) > 0:
// 		cachedSensors := make([]*types.Sensor, 0)
// 	LOOP:
// 		for i := range sensors {
// 			for j := range models {
// 				if strings.ToLower(sensors[i].Model) == strings.ToLower(models[j]) {
// 					cachedSensors = append(cachedSensors, sensors[i])
// 					continue LOOP
// 				}
// 			}
// 		}
// 		return cachedSensors, nil
// 	case len(models) <= 0:
// 		fallthrough
// 	default:
// 		return sensors, err
// 	}
// }

// // GetSensorsByDeviceID returns all sensors by a device id. If no sensor has
// // been found by the id, the function returns nil.
// func (repo *Repository) GetSensorsByDeviceID(deviceID string) ([]*types.Sensor, error) {
// 	cachedSensors := make([]*types.Sensor, 0)
// 	sensors, err := repo.GetSensors()
// 	if err != nil {
// 		return nil, err
// 	}

// 	for _, sensor := range sensors {
// 		if strings.Compare(sensor.DeviceID, deviceID) == 0 {
// 			cachedSensors = append(cachedSensors, sensor)
// 		}
// 	}

// 	return cachedSensors, nil
// }

// // GetTemperature returns a temperature value by id
// func (repo *Repository) GetTemperature(pressureID string) (*types.MeasuredValue, error) {
// 	return repo.database.SelectTemperature(context.Background(), pressureID)
// }

// // RemoveDevices removes devices by their ids from the repository. Additional
// // all sensors and measured values, which are in relation with the device
// // respectively the sensors will also be deleted.
// func (repo *Repository) RemoveDevices(deviceIDs ...string) error {
// 	return repo.database.DeleteDevices(context.Background(), deviceIDs...)
// }

// // RenameSensors all sensors which match by their current name to the new name
// func (repo *Repository) RenameSensors(oldName string, newName string) error {
// 	sensors, err := repo.GetSensors()
// 	if err != nil {
// 		return err
// 	}

// 	matchedSensors := make([]*types.Sensor, 0)
// 	for _, sensor := range sensors {
// 		if strings.Compare(sensor.Name, oldName) == 0 {
// 			sensor.Name = newName
// 			matchedSensors = append(matchedSensors, sensor)
// 		}
// 	}

// 	return repo.UpdateSensors(matchedSensors...)
// }

// // RemoveSensors removes sensors by their ids from the repository. Additional
// // all measured values, which are in relation with the sensor will also be
// // deleted.
// func (repo *Repository) RemoveSensors(sensorIDs ...string) error {
// 	return repo.database.DeleteSensors(context.Background(), sensorIDs...)
// }

// // RemoveSensorsByNames removes all sensors which match bei their name
// func (repo *Repository) RemoveSensorsByNames(sensorNames ...string) error {
// 	sensors, err := repo.GetSensors()
// 	if err != nil {
// 		return err
// 	}

// 	matchedSensorIDs := make([]string, 0)
// 	for _, sensor := range sensors {
// 		for _, sensorName := range sensorNames {
// 			if strings.Compare(sensor.Name, sensorName) == 0 {
// 				matchedSensorIDs = append(matchedSensorIDs, sensor.ID)
// 			}
// 		}
// 	}

// 	return repo.RemoveSensors(matchedSensorIDs...)
// }

// // UpdateDevices update devices which are stored into the repository by their
// // id. The id of the device can not be updated.
// func (repo *Repository) UpdateDevices(devices ...*types.Device) error {
// 	return repo.database.UpdateDevices(context.Background(), devices...)
// }

// // UpdateSensors update sensors which are stored into the repository by their
// // id. The id of the sensor can not be updated.
// func (repo *Repository) UpdateSensors(sensors ...*types.Sensor) error {
// 	return repo.database.UpdateSensors(context.Background(), sensors...)
// }

// // New returns a new repository based on the data source name (dsn)
// func New(dsnURL *url.URL, flogger logger.Logger) (*Repository, error) {
// 	database, err := db.New(dsnURL, flogger)
// 	if err != nil {
// 		return nil, err
// 	}

// 	return &Repository{
// 		database: database,
// 	}, nil
// }

// type OptImport struct {
// 	Sensors      bool
// 	Humidities   bool
// 	Pressures    bool
// 	Temperatures bool
// }

// func Import(sourceDSNURL *url.URL, destDNSURL *url.URL, flogger logger.Logger, optImport OptImport) error {

// 	importMap := map[string]bool{
// 		"humidities":   optImport.Humidities,
// 		"pressures":    optImport.Pressures,
// 		"temperatures": optImport.Temperatures,
// 	}

// 	// enable sensors if one measured value is enabled
// 	if !optImport.Sensors {
// 		for key, value := range importMap {
// 			if value {
// 				flogger.Info("Enable import option sensors. It's required as foreign key for %v", key)
// 				optImport.Sensors = true
// 			}
// 		}
// 	}

// 	// Initialize source repository
// 	sourceRepo, err := New(sourceDSNURL, flogger)
// 	if err != nil {
// 		return fmt.Errorf("Failed to open the source repo: %w", err)
// 	}
// 	defer sourceRepo.Close()

// 	// Initialize destination repository
// 	destRepo, err := New(destDNSURL, flogger)
// 	if err != nil {
// 		return fmt.Errorf("Failed to open the destination repo: %w", err)
// 	}
// 	defer destRepo.Close()

// 	// AddOrUpdate: Devices
// 	ctx := context.Background()
// 	devices, err := sourceRepo.database.SelectDevices(ctx)
// 	if err != nil {
// 		return fmt.Errorf("Failed to fetch devices from source repo: %w", err)
// 	}

// 	flogger.Debug("Found %v devices", len(devices))

// 	for i := range devices {
// 		err := destRepo.AddOrUpdateDevices(devices[i])
// 		if err != nil {
// 			return fmt.Errorf("Failed to add or update device %v into dest repo: %w", devices[i].Name, err)
// 		}
// 	}

// 	// AddOrUpdate: Sensors
// 	if optImport.Sensors {
// 		sensors, err := sourceRepo.database.SelectSensors(ctx)
// 		if err != nil {
// 			return fmt.Errorf("Failed to fetch sensors from source repo: %w", err)
// 		}

// 		flogger.Debug("Found %v sensors", len(sensors))

// 		for i := range sensors {
// 			err := destRepo.AddOrUpdateSensors(sensors[i])
// 			if err != nil {
// 				return fmt.Errorf("Failed to add or update sensor %v into dest repo: %w", sensors[i].Name, err)
// 			}
// 		}
// 	}

// 	for key, f := range map[string]func(context.Context) ([]*types.MeasuredValue, error){
// 		"humidities":   sourceRepo.database.SelectHumidities,
// 		"pressures":    sourceRepo.database.SelectPressures,
// 		"temperatures": sourceRepo.database.SelectTemperatures,
// 	} {
// 		if importMap[key] {
// 			measuredValues, err := f(ctx)
// 			if err != nil {
// 				return fmt.Errorf("Failed to select %v from source repo: %w", key, err)
// 			}

// 			flogger.Debug("Found %v %v values", len(measuredValues), key)

// 			err = destRepo.AddOrUpdateMeasuredValues(measuredValues...)
// 			if err != nil {
// 				return fmt.Errorf("Failed to add or update %v into dest repo: %w", key, err)
// 			}
// 		}
// 	}

// 	return nil
// }