package mijia

import (
	"encoding/binary"
	"fmt"
	"time"

	"github.com/go-ble/ble"
	influxdb2 "github.com/influxdata/influxdb-client-go/v2"
	influxdb2_api "github.com/influxdata/influxdb-client-go/v2/api"
	"go.uber.org/zap"
)

// XiaomiMijiaHTV1UUID is the Bluetooth UUID for Xiaomi Mijia BLE sensor data
var XiaomiMijiaHTV1UUID ble.UUID = []byte{0x95, 0xfe}

const (
	temperatureEvent            = 0x1004
	humidityEvent               = 0x1006
	illuminanceEvent            = 0x1007
	moistureEvent               = 0x1008
	conductivityEvent           = 0x1009
	batteryEvent                = 0x100a
	temperatureAndHumidityEvent = 0x100d
)

const (
	isFactoryNewFlag = (1 << iota)
	isConnectedFlag
	isCentralFlag
	isEncryptedFlag
	hasMacAddressFlag
	hasCapabilitiesFlag
	hasEventFlag
	hasCustomDataFlag
	hasSubtitleFlag
	hasBindingFlag
)

// ParseXiaomiMijiaSensorData parses
func ParseXiaomiMijiaSensorData(writeAPI *influxdb2_api.WriteAPI, logger *zap.Logger, timestamp time.Time, detector string, description string, advertisement ble.Advertisement, index int, sd ble.ServiceData) {
	var sensorData struct {
		frameControl    uint16
		isFactoryNew    bool
		isConnected     bool
		isCentral       bool
		isEncrypted     bool
		hasMacAddress   bool
		hasCapabilities bool
		hasEvent        bool
		hasCustomData   bool
		hasSubtitle     bool
		hasBinding      bool
		version         uint16
		productID       uint16
		frameCounter    uint8
		macAddress      []byte
		capabilities    uint8
		capabilityData  struct {
			connectable bool
			central     bool
			secure      bool
			io          uint8
		}
		eventData struct {
			eventType    uint16
			eventLength  uint8
			temperature  float64
			humidity     float64
			battery      uint8
			illuminance  uint
			conductivity int16
			moisture     int8
		}
	}
	sensorData.frameControl = binary.LittleEndian.Uint16(sd.Data[0:])
	sensorData.isFactoryNew = sensorData.frameControl&isFactoryNewFlag != 0
	sensorData.isConnected = sensorData.frameControl&isConnectedFlag != 0
	sensorData.isCentral = sensorData.frameControl&isCentralFlag != 0
	sensorData.isEncrypted = sensorData.frameControl&isEncryptedFlag != 0
	sensorData.hasMacAddress = sensorData.frameControl&hasMacAddressFlag != 0
	sensorData.hasCapabilities = sensorData.frameControl&hasCapabilitiesFlag != 0
	sensorData.hasEvent = sensorData.frameControl&hasEventFlag != 0
	sensorData.hasCustomData = sensorData.frameControl&hasCustomDataFlag != 0
	sensorData.hasSubtitle = sensorData.frameControl&hasSubtitleFlag != 0
	sensorData.hasBinding = sensorData.frameControl&hasBindingFlag != 0
	sensorData.version = (sensorData.frameControl >> 12) & 0x0f
	sensorData.productID = binary.LittleEndian.Uint16(sd.Data[2:])
	sensorData.frameCounter = uint8(sd.Data[4])
	if sensorData.hasMacAddress {
		sensorData.macAddress = sd.Data[5 : 5+6]
		for i, j := 0, len(sensorData.macAddress)-1; i < j; i, j = i+1, j-1 {
			sensorData.macAddress[i], sensorData.macAddress[j] = sensorData.macAddress[j], sensorData.macAddress[i]
		}
	}
	if sensorData.hasCapabilities {
		var capabilityOffset int = 11
		if !sensorData.hasMacAddress {
			capabilityOffset = 5
		}
		sensorData.capabilities = uint8(sd.Data[capabilityOffset])
		sensorData.capabilityData.connectable = sensorData.capabilities&(1<<0) != 0
		sensorData.capabilityData.central = sensorData.capabilities&(1<<1) != 0
		sensorData.capabilityData.secure = sensorData.capabilities&(1<<2) != 0
		sensorData.capabilityData.io = sensorData.capabilities & ((1 << 3) | (1 << 4)) // != 0
		logger.Debug("mijia capabilities",
			zap.Bool("connectable", sensorData.capabilityData.connectable),
			zap.Bool("central", sensorData.capabilityData.central),
			zap.Bool("secure", sensorData.capabilityData.secure),
			zap.Uint8("io", sensorData.capabilityData.io))
	}
	if sensorData.isEncrypted {
		logger.Warn("packet is encrypted")
		return
	}
	if sensorData.hasEvent {
		var eventOffset int = 5
		if sensorData.hasMacAddress {
			eventOffset = 11
		}
		if sensorData.hasCapabilities {
			eventOffset++
		}

		sensorData.eventData.eventType = binary.LittleEndian.Uint16(sd.Data[eventOffset:])
		sensorData.eventData.eventLength = uint8(sd.Data[eventOffset+2])

		switch sensorData.eventData.eventType {
		case temperatureEvent:
			sensorData.eventData.temperature = float64(int16(binary.LittleEndian.Uint16(sd.Data[eventOffset+3:]))) / 10.0

			point := influxdb2.NewPointWithMeasurement("temperature")
			point.SetTime(timestamp)
			if detector != "" {
				point.AddTag("detector", detector)
			}
			point.AddTag("address", advertisement.Addr().String())
			point.AddTag("product_id", fmt.Sprintf("%x", sensorData.productID))
			if description != "" {
				point.AddTag("description", description)
			}
			point.AddTag("unit", "°C")
			point.AddField("value", sensorData.eventData.temperature)
			(*writeAPI).WritePoint(point)

			logger.Debug("sending sensor reading",
				zap.String("source", advertisement.Addr().String()),
				zap.String("description", description),
				zap.String("measurement", "temperature"),
				zap.String("measurement_unit", "°C"),
				zap.Float64("value", sensorData.eventData.temperature))

		case humidityEvent:
			sensorData.eventData.humidity = float64(binary.LittleEndian.Uint16(sd.Data[eventOffset+3:])) / 10.0

			point := influxdb2.NewPointWithMeasurement("humidity")
			point.SetTime(timestamp)
			if detector != "" {
				point.AddTag("detector", detector)
			}
			point.AddTag("address", advertisement.Addr().String())
			point.AddTag("product_id", fmt.Sprintf("%x", sensorData.productID))
			if description != "" {
				point.AddTag("description", description)
			}
			point.AddTag("unit", "%")
			point.AddField("value", sensorData.eventData.humidity)
			(*writeAPI).WritePoint(point)

			logger.Debug("sending sensor reading",
				zap.String("source", advertisement.Addr().String()),
				zap.String("description", description),
				zap.String("measurement", "humidity"),
				zap.String("measurement_unit", "%"),
				zap.Float64("value", sensorData.eventData.humidity))

		case illuminanceEvent:
			sensorData.eventData.illuminance = uint(sd.Data[eventOffset+3]) + uint(sd.Data[eventOffset+4])<<8 + uint(sd.Data[eventOffset+5])<<16

			point := influxdb2.NewPointWithMeasurement("illuminance")
			point.SetTime(timestamp)
			if detector != "" {
				point.AddTag("detector", detector)
			}
			point.AddTag("address", advertisement.Addr().String())
			point.AddTag("product_id", fmt.Sprintf("%x", sensorData.productID))
			if description != "" {
				point.AddTag("description", description)
			}
			point.AddTag("unit", "lx")
			point.AddField("value", sensorData.eventData.illuminance)
			(*writeAPI).WritePoint(point)

			logger.Debug("sending sensor reading",
				zap.String("source", advertisement.Addr().String()),
				zap.String("description", description),
				zap.String("measurement", "illuminance"),
				zap.String("measurement_unit", "lx"),
				zap.Uint("value", sensorData.eventData.illuminance))

		case moistureEvent:
			sensorData.eventData.moisture = int8(sd.Data[eventOffset+3])

			point := influxdb2.NewPointWithMeasurement("moisture")
			point.SetTime(timestamp)
			if detector != "" {
				point.AddTag("detector", detector)
			}
			point.AddTag("address", advertisement.Addr().String())
			point.AddTag("product_id", fmt.Sprintf("%x", sensorData.productID))
			if description != "" {
				point.AddTag("description", description)
			}
			point.AddTag("unit", "%")
			point.AddField("value", sensorData.eventData.moisture)
			(*writeAPI).WritePoint(point)

			logger.Debug("sending sensor reading",
				zap.String("source", advertisement.Addr().String()),
				zap.String("description", description),
				zap.String("measurement", "moisture"),
				zap.String("measurement_unit", "%"),
				zap.Int8("value", sensorData.eventData.moisture))

		case conductivityEvent:
			sensorData.eventData.conductivity = int16(binary.LittleEndian.Uint16(sd.Data[eventOffset+3:]))

			point := influxdb2.NewPointWithMeasurement("conductivity")
			point.SetTime(timestamp)
			if detector != "" {
				point.AddTag("detector", detector)
			}
			point.AddTag("address", advertisement.Addr().String())
			point.AddTag("product_id", fmt.Sprintf("%x", sensorData.productID))
			if description != "" {
				point.AddTag("description", description)
			}
			point.AddTag("unit", "µS/cm")
			point.AddField("value", sensorData.eventData.conductivity)
			(*writeAPI).WritePoint(point)

			logger.Debug("sending sensor reading",
				zap.String("source", advertisement.Addr().String()),
				zap.String("description", description),
				zap.String("measurement", "conducivity"),
				zap.String("measurement_unit", "µS/cm"),
				zap.Int16("value", sensorData.eventData.conductivity))

		case batteryEvent:
			sensorData.eventData.battery = uint8(sd.Data[eventOffset+3])

			point := influxdb2.NewPointWithMeasurement("battery")
			point.SetTime(timestamp)
			if detector != "" {
				point.AddTag("detector", detector)
			}
			point.AddTag("address", advertisement.Addr().String())
			point.AddTag("product_id", fmt.Sprintf("%x", sensorData.productID))
			if description != "" {
				point.AddTag("description", description)
			}
			point.AddTag("unit", "%")
			point.AddField("value", sensorData.eventData.battery)
			(*writeAPI).WritePoint(point)

			logger.Debug("sending sensor reading",
				zap.String("source", advertisement.Addr().String()),
				zap.String("description", description),
				zap.String("measurement", "battery"),
				zap.String("measurement_unit", "%"),
				zap.Uint8("value", sensorData.eventData.battery))

		case temperatureAndHumidityEvent:
			sensorData.eventData.temperature = float64(int16(binary.LittleEndian.Uint16(sd.Data[eventOffset+3:]))) / 10.0

			point := influxdb2.NewPointWithMeasurement("temperature")
			point.SetTime(timestamp)
			if detector != "" {
				point.AddTag("detector", detector)
			}
			point.AddTag("address", advertisement.Addr().String())
			point.AddTag("product_id", fmt.Sprintf("%x", sensorData.productID))
			if description != "" {
				point.AddTag("description", description)
			}
			point.AddTag("unit", "°C")
			point.AddField("value", sensorData.eventData.temperature)
			(*writeAPI).WritePoint(point)

			logger.Debug("sending sensor reading",
				zap.String("source", advertisement.Addr().String()),
				zap.String("description", description),
				zap.String("measurement", "temperature"),
				zap.String("measurement_unit", "°C"),
				zap.Float64("value", sensorData.eventData.temperature))

			sensorData.eventData.humidity = float64(binary.LittleEndian.Uint16(sd.Data[eventOffset+5:])) / 10.0

			point = influxdb2.NewPointWithMeasurement("humidity")
			point.SetTime(timestamp)
			if detector != "" {
				point.AddTag("detector", detector)
			}
			point.AddTag("address", advertisement.Addr().String())
			point.AddTag("product_id", fmt.Sprintf("%x", sensorData.productID))
			if description != "" {
				point.AddTag("description", description)
			}
			point.AddTag("unit", "%")
			point.AddField("value", sensorData.eventData.humidity)
			(*writeAPI).WritePoint(point)

			logger.Debug("sending sensor reading",
				zap.String("source", advertisement.Addr().String()),
				zap.String("description", description),
				zap.String("measurement", "humidity"),
				zap.String("measurement_unit", "%"),
				zap.Float64("value", sensorData.eventData.humidity))

		default:
			logger.Debug("unknown event type",
				zap.String("source", advertisement.Addr().String()),
				zap.String("description", description),
				zap.Uint16("event_type", sensorData.eventData.eventType),
				zap.Binary("data", sd.Data),
				zap.Binary("event_data", sd.Data[eventOffset+3:]))
		}
	}
}