package api

import (
	"reflect"

	"github.com/mitchellh/mapstructure"
	"go.arsenm.dev/infinitime"
	"go.arsenm.dev/itd/internal/types"
)

// Address gets the bluetooth address of the connected device
func (c *Client) Address() (string, error) {
	res, err := c.request(types.Request{
		Type: types.ReqTypeBtAddress,
	})
	if err != nil {
		return "", err
	}

	return res.Value.(string), nil
}

// Version gets the firmware version of the connected device
func (c *Client) Version() (string, error) {
	res, err := c.request(types.Request{
		Type: types.ReqTypeFwVersion,
	})
	if err != nil {
		return "", err
	}

	return res.Value.(string), nil
}

// BatteryLevel gets the battery level of the connected device
func (c *Client) BatteryLevel() (uint8, error) {
	res, err := c.request(types.Request{
		Type: types.ReqTypeBattLevel,
	})
	if err != nil {
		return 0, err
	}

	return uint8(res.Value.(float64)), nil
}

// WatchBatteryLevel returns a channel which will contain
// new battery level values as they update. Do not use after
// calling cancellation function
func (c *Client) WatchBatteryLevel() (<-chan uint8, func(), error) {
	c.battLevelCh = make(chan uint8, 2)
	err := c.requestNoRes(types.Request{
		Type: types.ReqTypeBattLevel,
	})
	if err != nil {
		return nil, nil, err
	}
	cancel := c.cancelFn(types.ReqTypeCancelBattLevel, c.battLevelCh)
	return c.battLevelCh, cancel, nil
}

// HeartRate gets the heart rate from the connected device
func (c *Client) HeartRate() (uint8, error) {
	res, err := c.request(types.Request{
		Type: types.ReqTypeHeartRate,
	})
	if err != nil {
		return 0, err
	}

	return uint8(res.Value.(float64)), nil
}

// WatchHeartRate returns a channel which will contain
// new heart rate values as they update. Do not use after
// calling cancellation function
func (c *Client) WatchHeartRate() (<-chan uint8, func(), error) {
	c.heartRateCh = make(chan uint8, 2)
	err := c.requestNoRes(types.Request{
		Type: types.ReqTypeWatchHeartRate,
	})
	if err != nil {
		return nil, nil, err
	}
	cancel := c.cancelFn(types.ReqTypeCancelHeartRate, c.heartRateCh)
	return c.heartRateCh, cancel, nil
}

// cancelFn generates a cancellation function for the given
// request type and channel
func (c *Client) cancelFn(reqType int, ch interface{}) func() {
	return func() {
		reflectCh := reflect.ValueOf(ch)
		reflectCh.Close()
		reflectCh.Set(reflect.Zero(reflectCh.Type()))
		c.requestNoRes(types.Request{
			Type: reqType,
		})
	}
}

// StepCount gets the step count from the connected device
func (c *Client) StepCount() (uint32, error) {
	res, err := c.request(types.Request{
		Type: types.ReqTypeStepCount,
	})
	if err != nil {
		return 0, err
	}

	return uint32(res.Value.(float64)), nil
}

// WatchStepCount returns a channel which will contain
// new step count values as they update. Do not use after
// calling cancellation function
func (c *Client) WatchStepCount() (<-chan uint32, func(), error) {
	c.stepCountCh = make(chan uint32, 2)
	err := c.requestNoRes(types.Request{
		Type: types.ReqTypeWatchStepCount,
	})
	if err != nil {
		return nil, nil, err
	}
	cancel := c.cancelFn(types.ReqTypeCancelStepCount, c.stepCountCh)
	return c.stepCountCh, cancel, nil
}

// Motion gets the motion values from the connected device
func (c *Client) Motion() (infinitime.MotionValues, error) {
	out := infinitime.MotionValues{}
	res, err := c.request(types.Request{
		Type: types.ReqTypeMotion,
	})
	if err != nil {
		return out, err
	}
	err = mapstructure.Decode(res.Value, &out)
	if err != nil {
		return out, err
	}
	return out, nil
}

// WatchMotion returns a channel which will contain
// new motion values as they update. Do not use after
// calling cancellation function
func (c *Client) WatchMotion() (<-chan infinitime.MotionValues, func(), error) {
	c.motionCh = make(chan infinitime.MotionValues, 2)
	err := c.requestNoRes(types.Request{
		Type: types.ReqTypeWatchMotion,
	})
	if err != nil {
		return nil, nil, err
	}
	cancel := c.cancelFn(types.ReqTypeCancelMotion, c.motionCh)
	return c.motionCh, cancel, nil
}