package device

import (
	"maps"
	"sync"
)

// DeviceState holds the simulated device state with thread-safe access
type DeviceState struct {
	mu sync.RWMutex

	progMode    bool
	caliMode    bool
	alarmActive bool
	alarmType   string // "TRIGGERED" or "TAMPER"

	// Parameters from docs.toon
	// W1=1200 (Min Threshold), W2=4000 (Max Threshold), W3=2 (Pulse Count),
	// W4=40 (Time Window), W20=128 (Gain)
	params map[int]int

	sensorValue int // Default 2067 (ideal rest value)
	jitterRange int // Default 10 (means ±10)

	connectedClients int // Track number of connected BLE clients
}

// NewDeviceState creates a new DeviceState with default values
func NewDeviceState() *DeviceState {
	return &DeviceState{
		progMode:    false,
		caliMode:    false,
		alarmActive: false,
		alarmType:   "",
		params: map[int]int{
			1:  1000, // W1 - Min Threshold (middle of 0-2000)
			2:  2047, // W2 - Max Threshold (middle of 0-4095)
			3:  25,   // W3 - Pulse Count (middle of 1-50)
			4:  505,  // W4 - Time Window (middle of 10-1000)
			11: 0,    // W11 - Min Pulse Duration (min)
			12: 1000, // W12 - Max Pulse Duration (max)
			20: 127,  // W20 - Gain (middle of 0-255)
		},
		sensorValue:      2067,
		jitterRange:      10,
		connectedClients: 0,
	}
}

// GetProgMode returns whether programming mode is active
func (s *DeviceState) GetProgMode() bool {
	s.mu.RLock()
	defer s.mu.RUnlock()
	return s.progMode
}

// SetProgMode sets the programming mode
func (s *DeviceState) SetProgMode(enabled bool) {
	s.mu.Lock()
	defer s.mu.Unlock()
	s.progMode = enabled
}

// GetCaliMode returns whether calibration mode is active
func (s *DeviceState) GetCaliMode() bool {
	s.mu.RLock()
	defer s.mu.RUnlock()
	return s.caliMode
}

// ToggleCaliMode toggles the calibration mode
func (s *DeviceState) ToggleCaliMode() bool {
	s.mu.Lock()
	defer s.mu.Unlock()
	s.caliMode = !s.caliMode
	return s.caliMode
}

// GetAlarmActive returns whether the alarm is active
func (s *DeviceState) GetAlarmActive() bool {
	s.mu.RLock()
	defer s.mu.RUnlock()
	return s.alarmActive
}

// ResetAlarm resets the alarm state
func (s *DeviceState) ResetAlarm() {
	s.mu.Lock()
	defer s.mu.Unlock()
	s.alarmActive = false
}

// GetParam returns a parameter value by ID
func (s *DeviceState) GetParam(id int) (int, bool) {
	s.mu.RLock()
	defer s.mu.RUnlock()
	val, ok := s.params[id]
	return val, ok
}

// SetParam sets a parameter value by ID
func (s *DeviceState) SetParam(id, value int) {
	s.mu.Lock()
	defer s.mu.Unlock()
	s.params[id] = value
}

// GetSensorValue returns the current sensor value
func (s *DeviceState) GetSensorValue() int {
	s.mu.RLock()
	defer s.mu.RUnlock()
	return s.sensorValue
}

// ResetToDefaults resets all parameters to factory defaults
func (s *DeviceState) ResetToDefaults() {
	s.mu.Lock()
	defer s.mu.Unlock()
	s.progMode = false
	s.caliMode = false
	s.alarmActive = false
	s.alarmType = ""
	s.params = map[int]int{
		1:  1000,
		2:  2047,
		3:  25,
		4:  505,
		11: 0,
		12: 1000,
		20: 127,
	}
	s.sensorValue = 2067
	s.jitterRange = 10
}

// SetSensorValue sets the current sensor value
func (s *DeviceState) SetSensorValue(value int) {
	s.mu.Lock()
	defer s.mu.Unlock()
	s.sensorValue = value
}

// GetJitterRange returns the current jitter range
func (s *DeviceState) GetJitterRange() int {
	s.mu.RLock()
	defer s.mu.RUnlock()
	return s.jitterRange
}

// SetJitterRange sets the jitter range
func (s *DeviceState) SetJitterRange(jitter int) {
	s.mu.Lock()
	defer s.mu.Unlock()
	s.jitterRange = jitter
}

// TriggerAlarm triggers an alarm with the given type ("TRIGGERED" or "TAMPER")
func (s *DeviceState) TriggerAlarm(alarmType string) {
	s.mu.Lock()
	defer s.mu.Unlock()
	s.alarmActive = true
	s.alarmType = alarmType
}

// GetAlarmType returns the current alarm type
func (s *DeviceState) GetAlarmType() string {
	s.mu.RLock()
	defer s.mu.RUnlock()
	return s.alarmType
}

// GetAlarmState returns both the alarm active state and type atomically
func (s *DeviceState) GetAlarmState() (bool, string) {
	s.mu.RLock()
	defer s.mu.RUnlock()
	return s.alarmActive, s.alarmType
}

// GetAllParams returns a copy of all parameters
func (s *DeviceState) GetAllParams() map[int]int {
	s.mu.RLock()
	defer s.mu.RUnlock()
	return maps.Clone(s.params)
}

// IncrConnectedClients increments the connected clients count
func (s *DeviceState) IncrConnectedClients() {
	s.mu.Lock()
	defer s.mu.Unlock()
	s.connectedClients++
}

// DecrConnectedClients decrements the connected clients count
func (s *DeviceState) DecrConnectedClients() {
	s.mu.Lock()
	defer s.mu.Unlock()
	if s.connectedClients > 0 {
		s.connectedClients--
	}
}

// GetConnectedClients returns the number of connected clients
func (s *DeviceState) GetConnectedClients() int {
	s.mu.RLock()
	defer s.mu.RUnlock()
	return s.connectedClients
}