package ble

import (
	"bytes"
	"encoding/binary"

	"gobot.io/x/gobot/v2"
)

const (
	genericAccessDeviceNameCharaShort = "2a00"
	genericAccessAppearanceCharaShort = "2a01"
)

// GenericAccessDriver represents the Generic Access Service for a BLE Peripheral
type GenericAccessDriver struct {
	*Driver
	gobot.Eventer
}

// NewGenericAccessDriver creates a GenericAccessDriver
func NewGenericAccessDriver(a gobot.BLEConnector, opts ...OptionApplier) *GenericAccessDriver {
	d := &GenericAccessDriver{
		Driver:  NewDriver(a, "GenericAccess", nil, nil, opts...),
		Eventer: gobot.NewEventer(),
	}

	return d
}

// GetDeviceName returns the device name for the BLE Peripheral
func (d *GenericAccessDriver) GetDeviceName() (string, error) {
	c, err := d.Adaptor().ReadCharacteristic(genericAccessDeviceNameCharaShort)
	if err != nil {
		return "", err
	}

	buf := bytes.NewBuffer(c)
	val := buf.String()
	return val, nil
}

// GetAppearance returns the appearance string for the BLE Peripheral
func (d *GenericAccessDriver) GetAppearance() (string, error) {
	c, err := d.Adaptor().ReadCharacteristic(genericAccessAppearanceCharaShort)
	if err != nil {
		return "", err
	}

	buf := bytes.NewBuffer(c)

	var val uint16
	if err := binary.Read(buf, binary.LittleEndian, &val); err != nil {
		return "", err
	}
	return appearances[val], nil
}

var appearances = map[uint16]string{
	0:    "Unknown",
	1024: "Generic Glucose Meter",
	1088: "Generic: Running Walking Sensor",
	1089: "Running Walking Sensor: In-Shoe",
	1090: "Running Walking Sensor: On-Shoe",
	1091: "Running Walking Sensor: On-Hip",
	1152: "Generic: Cycling",
	1153: "Cycling: Cycling Computer",
	1154: "Cycling: Speed Sensor",
	1155: "Cycling: Cadence Sensor",
	1156: "Cycling: Power Sensor",
	1157: "Cycling: Speed and Cadence Sensor",
	128:  "Generic Computer",
	192:  "Generic Watch",
	193:  "Watch: Sports Watch",
	256:  "Generic Clock",
	3136: "Generic: Pulse Oximeter",
	3137: "Fingertip Pulse",
	3138: "Wrist Worn",
	320:  "Generic Display",
	3200: "Generic: Weight Scale",
	384:  "Generic Remote Control",
	448:  "Generic Eye-glasses",
	512:  "Generic Tag",
	5184: "Generic: Outdoor Sports Activity",
	5185: "Location Display Device",
	5186: "Location and Navigation Display Device",
	5187: "Location Pod",
	5188: "Location and Navigation Pod",
	576:  "Generic Keyring",
	64:   "Generic Phone",
	640:  "Generic Media Player",
	704:  "Generic Barcode Scanner",
	768:  "Generic Thermometer",
	769:  "Thermometer: Ear",
	832:  "Generic Heart rate Sensor",
	833:  "Heart Rate Sensor: Heart Rate Belt",
	896:  "Generic Blood Pressure",
	897:  "Blood Pressure: Arm Blood",
	898:  "Blood Pressure: Wrist Blood",
	960:  "Human Interface Device (HID)",
	961:  "Keyboard",
	962:  "Mouse",
	963:  "Joystick",
	964:  "Gamepad",
	965:  "Digitizer Tablet",
	966:  "Card Reader",
	967:  "Digital Pen",
	968:  "Barcode Scanner",
}