package logfile

import (
	"path/filepath"
	"time"
)

// var validUUID = regexp.MustCompile("^[a-fA-F0-9]{8}-[a-fA-F0-9]{4}-4[a-fA-F0-9]{3}-[8|9|aA|bB][a-fA-F0-9]{3}-[a-fA-F0-9]{12}$")
var timeFormat = time.RFC3339

// // AppendTemperatures with temperature values from a logfile. As additional
// // option it's possible to compress the temperature data.
// func AppendTemperatures(logfile Logfile, compression bool, temperatures []*types.Temperature) error {

// 	allTemperatures := make([]*types.Temperature, 0)

// 	if _, err := os.Stat(logfile.GetLogfile()); err == nil {
// 		temperaturesFromLogfile, err := logfile.ReadTemperatures()
// 		if err != nil {
// 			return err
// 		}

// 		allTemperatures = append(allTemperatures, temperaturesFromLogfile...)
// 	}

// 	allTemperatures = append(allTemperatures, temperatures...)

// 	if compression {
// 		allTemperatures = CompressTemperature(allTemperatures)
// 	}

// 	err := logfile.WriteTemperatures(allTemperatures)
// 	if err != nil {
// 		return err
// 	}
// 	return nil
// }

// CompressTemperature compresses the temperatures from an array. It is checked
// whether the measured temperature of a value corresponds to that of the
// predecessor. If this is the case, the current value is discarded and the
// validity date of the predecessor value is set to that of the current value.
// No information is lost as a result. The validity period of the measured value
// is thereby exclusively increased.
// func Compression(measuredValues []types) []*types.Temperature {
// 	compressedTemperatures := make([]*types.Temperature, 0)
// 	lastTemperatureBySensors := make(map[string]*types.Temperature, 0)

// 	// Sort all measured temperatures beforehand by the starting validity date to
// 	// avoid errors when compressing the temperatures.
// 	SortTemperatures(temperatures)

// 	for _, temperature := range temperatures {
// 		if lastTemperatureBySensor, ok := lastTemperatureBySensors[temperature.SensorID]; ok {
// 			if lastTemperatureBySensor.TemperatureValue == temperature.TemperatureValue {

// 				lastTemperatureBySensors[temperature.SensorID].TemperatureTillDate = temperature.TemperatureTillDate

// 				now := time.Now()
// 				lastTemperatureBySensors[temperature.SensorID].UpdateDate = &now
// 			} else {
// 				compressedTemperatures = append(compressedTemperatures, lastTemperatureBySensors[temperature.SensorID])
// 				lastTemperatureBySensors[temperature.SensorID] = temperature
// 			}
// 		} else {
// 			lastTemperatureBySensors[temperature.SensorID] = temperature
// 		}
// 	}

// 	// Copy all remaining entries from the map into the array
// 	for _, lastTemperatureBySensor := range lastTemperatureBySensors {
// 		compressedTemperatures = append(compressedTemperatures, lastTemperatureBySensor)
// 	}

// 	return compressedTemperatures
// }

// New returns a log file with basic functions for reading and writing data. The
// file extension of the logfile is taken into account to format the logfile
// into the correct format.
func New(logfile string) Logfile {

	ext := filepath.Join(logfile)

	switch ext {
	// case ".csv":
	// 	return &csvLogfile{
	// 		logfile: logfile,
	// 	}
	case ".json":
		return &jsonLogfile{
			logfile: logfile,
		}
	// case ".xml":
	// 	return &xmlLogfile{
	// 		logfile: logfile,
	// 	}
	default:
		return &jsonLogfile{
			logfile: logfile,
		}
	}

}

// // SplittTemperatures into multiple arrays. The Size can be defined by
// // temperatureSplitBy parameter.
// func SplittTemperatures(temperatures []*types.Temperature, templeratureSplitBy int) [][]*types.Temperature {
// 	splittedTemperatures := make([][]*types.Temperature, 0)
// 	newTemperatures := make([]*types.Temperature, 0)
// 	for _, temperature := range temperatures {
// 		if len(newTemperatures) == templeratureSplitBy {
// 			splittedTemperatures = append(splittedTemperatures, newTemperatures)
// 			newTemperatures = make([]*types.Temperature, 0)
// 		}
// 		newTemperatures = append(newTemperatures, temperature)
// 	}
// 	splittedTemperatures = append(splittedTemperatures, newTemperatures)
// 	return splittedTemperatures
// }

// // SortTemperatures by TemperatureFromDate
// func SortTemperatures(temperatures []*types.Temperature) {
// 	sort.SliceStable(temperatures, func(i int, j int) bool {
// 		return temperatures[i].TemperatureFromDate.Before(temperatures[j].TemperatureFromDate)
// 	})
// }

// // ValidateTemperatures Checks if the temperature data is valid.
// // - Check the temperature id (uuid)
// // - Checks whether the time specifications are historically in a sequence.
// // - Check the sensor id (uuid)
// func ValidateTemperatures(temperatures []*types.Temperature) error {
// 	for _, temperature := range temperatures {
// 		if !validUUID.MatchString(temperature.TemperatureID) {
// 			return errorNoValidTemperatureID
// 		} else if temperature.TemperatureValue == 0 {
// 			return errorNoValidMesuredValue
// 		} else if temperature.TemperatureFromDate.After(temperature.TemperatureTillDate) {
// 			return errorNoValidTimePeriods
// 		} else if !validUUID.MatchString(temperature.SensorID) {
// 			return errorNoValidSensorID
// 		} else if temperature.CreationDate.After(*temperature.UpdateDate) && temperature.UpdateDate != nil {
// 			return errorNoValidTimePeriods
// 		}
// 	}

// 	return nil
// }

// func writeCreationDate(temperatures []*types.Temperature) {
// 	now := time.Now()
// 	for _, temperature := range temperatures {
// 		if temperature.CreationDate == nil {
// 			temperature.CreationDate = &now
// 		}
// 	}
// }