package lifx

import (
	"encoding/binary"
	"fmt"
	"git.aiterp.net/lucifer/new-server/internal/lerrors"
	"math"
	"time"
)

type GetService struct{}

func (p *GetService) Decode([]byte) error {
	return nil
}

func (p *GetService) Encode() []byte {
	return []byte{}
}

func (p *GetService) PacketType() uint16 {
	return 2
}

func (p *GetService) Flags() (ackRequired bool, resRequired bool) {
	return false, true
}

func (p *GetService) String() string {
	return "GetService()"
}

type GetVersion struct{}

func (p *GetVersion) Decode([]byte) error {
	return nil
}

func (p *GetVersion) Encode() []byte {
	return []byte{}
}

func (p *GetVersion) PacketType() uint16 {
	return 32
}

func (p *GetVersion) Flags() (ackRequired bool, resRequired bool) {
	return false, true
}

func (p *GetVersion) String() string {
	return "GetVersion()"
}

type GetHostFirmware struct{}

func (p *GetHostFirmware) Decode([]byte) error {
	return nil
}

func (p *GetHostFirmware) Encode() []byte {
	return []byte{}
}

func (p *GetHostFirmware) PacketType() uint16 {
	return 14
}

func (p *GetHostFirmware) Flags() (ackRequired bool, resRequired bool) {
	return false, true
}

func (p *GetHostFirmware) String() string {
	return "GetHostFirmware()"
}

type StateHostFirmware struct {
	BuildTime time.Time
	Major     uint16
	Minor     uint16
}

func (p *StateHostFirmware) Decode(data []byte) error {
	if len(data) < 20 {
		return lerrors.ErrPayloadTooShort
	}

	ts := int64(binary.LittleEndian.Uint64(data[0:8]))

	p.BuildTime = time.Unix(ts/1000000000, ts%1000000000)
	p.Major = binary.LittleEndian.Uint16(data[16:18])
	p.Minor = binary.LittleEndian.Uint16(data[18:20])

	return nil
}

func (p *StateHostFirmware) Encode() []byte {
	var data [20]byte

	binary.LittleEndian.PutUint64(data[0:8], uint64(p.BuildTime.UnixNano()))
	binary.LittleEndian.PutUint16(data[16:18], p.Major)
	binary.LittleEndian.PutUint16(data[18:20], p.Minor)

	return data[:]
}

func (p *StateHostFirmware) PacketType() uint16 {
	return 15
}

func (p *StateHostFirmware) Flags() (ackRequired bool, resRequired bool) {
	return false, false
}

func (p *StateHostFirmware) String() string {
	return fmt.Sprintf("StateHostFirmware(major=%d, minor=%d, build=%s)", p.Major, p.Minor, p.BuildTime.Format(time.RFC3339))
}

type StateVersion struct {
	Vendor  uint32
	Product uint32
}

func (p *StateVersion) Decode(data []byte) error {
	if len(data) < 8 {
		return lerrors.ErrPayloadTooShort
	}

	p.Vendor = binary.LittleEndian.Uint32(data[0:4])
	p.Product = binary.LittleEndian.Uint32(data[4:8])

	return nil
}

func (p *StateVersion) Encode() []byte {
	var data [12]byte

	binary.LittleEndian.PutUint32(data[0:4], p.Vendor)
	binary.LittleEndian.PutUint32(data[4:8], p.Product)

	return data[:]
}

func (p *StateVersion) PacketType() uint16 {
	return 33
}

func (p *StateVersion) Flags() (ackRequired bool, resRequired bool) {
	return false, false
}

func (p *StateVersion) String() string {
	return fmt.Sprintf("StateVersion(vendor=%d, product=%d)", p.Vendor, p.Product)
}

type GetColor struct{}

func (p *GetColor) Decode([]byte) error {
	return nil
}

func (p *GetColor) Encode() []byte {
	return []byte{}
}

func (p *GetColor) PacketType() uint16 {
	return 101
}

func (p *GetColor) Flags() (ackRequired bool, resRequired bool) {
	return false, true
}

func (p *GetColor) String() string {
	return "GetColor()"
}

type Acknowledgement struct{}

func (p *Acknowledgement) Decode([]byte) error {
	return nil
}

func (p *Acknowledgement) Encode() []byte {
	return []byte{}
}

func (p *Acknowledgement) PacketType() uint16 {
	return 45
}

func (p *Acknowledgement) Flags() (ackRequired bool, resRequired bool) {
	return false, true
}

func (p *Acknowledgement) String() string {
	return "Acknowledgement()"
}

type SetColor struct {
	Hue            float64
	Sat            float64
	Bri            float64
	Kelvin         int
	TransitionTime time.Duration
}

func (p *SetColor) Decode(data []byte) error {
	if len(data) < 13 {
		return lerrors.ErrPayloadTooShort
	}

	hue := binary.LittleEndian.Uint16(data[1:3])
	sat := binary.LittleEndian.Uint16(data[3:5])
	bri := binary.LittleEndian.Uint16(data[5:7])
	kelvin := binary.LittleEndian.Uint16(data[7:9])
	transitionMs := binary.LittleEndian.Uint32(data[9:13])

	p.Hue = float64(hue) / (65536 / 360)
	p.Sat = float64(sat) / 65535
	p.Bri = float64(bri) / 65535
	p.Kelvin = int(kelvin)
	p.TransitionTime = time.Duration(transitionMs) * time.Millisecond

	return nil
}

func (p *SetColor) Encode() []byte {
	var data [13]byte

	data[0] = 0x00 // reserved
	binary.LittleEndian.PutUint16(data[1:3], uint16(math.Mod(p.Hue, 360)*(65536/360)))
	binary.LittleEndian.PutUint16(data[3:5], uint16(p.Sat*65535))
	binary.LittleEndian.PutUint16(data[5:7], uint16(p.Bri*65535))
	binary.LittleEndian.PutUint16(data[7:9], uint16(p.Kelvin))
	binary.LittleEndian.PutUint32(data[9:13], uint32(p.TransitionTime.Milliseconds()))

	return data[:]
}

func (p *SetColor) PacketType() uint16 {
	return 102
}

func (p *SetColor) Flags() (ackRequired bool, resRequired bool) {
	return true, false
}

func (p *SetColor) String() string {
	return fmt.Sprintf("SetColor(hsvk={%f, %f, %f, %d}, ttime=%s)",
		p.Hue,
		p.Sat,
		p.Bri,
		p.Kelvin,
		p.TransitionTime,
	)
}

type SetLightPower struct {
	On             bool
	TransitionTime time.Duration
}

func (p *SetLightPower) Decode(data []byte) error {
	if len(data) < 6 {
		return lerrors.ErrPayloadTooShort
	}

	level := binary.LittleEndian.Uint16(data[0:2])
	transitionMs := binary.LittleEndian.Uint32(data[2:6])

	p.On = level > 0
	p.TransitionTime = time.Duration(transitionMs) * time.Millisecond

	return nil
}

func (p *SetLightPower) Encode() []byte {
	var data [6]byte

	if p.On {
		data[0], data[1] = 0xff, 0xff
	} else {
		data[0], data[1] = 0x00, 0x00
	}
	binary.LittleEndian.PutUint32(data[2:6], uint32(p.TransitionTime.Milliseconds()))

	return data[:]
}

func (p *SetLightPower) PacketType() uint16 {
	return 117
}

func (p *SetLightPower) Flags() (ackRequired bool, resRequired bool) {
	return true, false
}

func (p *SetLightPower) String() string {
	return fmt.Sprintf("SetLightPower(on=%t, ttime=%s)",
		p.On,
		p.TransitionTime,
	)
}

type StateService struct {
	Service int
	Port    int
}

func (p *StateService) String() string {
	return fmt.Sprintf("StateService(service=%d, port=%d)", p.Service, p.Port)
}

func (p *StateService) Decode(data []byte) error {
	if len(data) < 5 {
		return lerrors.ErrPayloadTooShort
	}

	p.Service = int(data[0])
	p.Port = int(binary.LittleEndian.Uint32(data[1:5]))

	return nil
}

func (p *StateService) Encode() []byte {
	var data [5]byte
	data[0] = uint8(p.Service)
	binary.LittleEndian.PutUint32(data[1:5], uint32(p.Port))

	return data[:]
}

func (p *StateService) PacketType() uint16 {
	return 3
}

func (p *StateService) Flags() (ackRequired bool, resRequired bool) {
	return false, false
}

type LightState struct {
	Hue    float64
	Sat    float64
	Bri    float64
	Kelvin int
	On     bool
	Label  string
}

func (p *LightState) String() string {
	return fmt.Sprintf("LightState(hsvk=(%f, %f, %f, %d), on=%t, label=%+v)",
		p.Hue, p.Sat, p.Bri, p.Kelvin,
		p.On, p.Label,
	)
}

func (p *LightState) Decode(data []byte) error {
	if len(data) < 52 {
		return lerrors.ErrPayloadTooShort
	}

	hue := binary.LittleEndian.Uint16(data[0:2])
	sat := binary.LittleEndian.Uint16(data[2:4])
	bri := binary.LittleEndian.Uint16(data[4:6])
	kelvin := binary.LittleEndian.Uint16(data[6:8])
	power := binary.LittleEndian.Uint16(data[10:12])

	p.Hue = float64(hue) / (65536 / 360)
	p.Sat = float64(sat) / 65535
	p.Bri = float64(bri) / 65535
	p.Kelvin = int(kelvin)
	p.On = power > 32767

	p.Label = ""
	for i, v := range data[14:46] {
		if v == 0 {
			p.Label = string(data[14 : 14+i])
			break
		}
	}

	return nil
}

func (p *LightState) Encode() []byte {
	var data [52]byte

	power := uint16(0)
	if p.On {
		power = 0xffff
	}

	binary.LittleEndian.PutUint16(data[0:2], uint16(math.Mod(p.Hue, 360)*(65536/360)))
	binary.LittleEndian.PutUint16(data[2:4], uint16(p.Sat*65535))
	binary.LittleEndian.PutUint16(data[4:6], uint16(p.Bri*65535))
	binary.LittleEndian.PutUint16(data[6:8], uint16(p.Kelvin))
	binary.LittleEndian.PutUint16(data[10:12], power)

	label := p.Label
	labelBytes := []byte(label)
	for len(labelBytes) > 31 {
		label = label[:len(label)-1]
		labelBytes = []byte(label)
	}
	copy(data[14:], labelBytes)

	return data[:]
}

func (p *LightState) PacketType() uint16 {
	return 107
}

func (p *LightState) Flags() (ackRequired bool, resRequired bool) {
	return false, false
}