package repository

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

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

// 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
			}
		}
	}

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

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

	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.AddDevices(devices[i])
		if err != nil {
			return fmt.Errorf("Failed to add device %v into dest repo: %w", devices[i].Name, err)
		}
	}

	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.AddSensors(sensors[i])
			if err != nil {
				return fmt.Errorf("Failed to add 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.AddMeasuredValues(measuredValues...)
			if err != nil {
				return fmt.Errorf("Failed to add %v into dest repo: %w", key, err)
			}
		}
	}

	return nil
}