package models

import (
	"context"
	"encoding/hex"
	"errors"
)

// ErrMalformedColor is returned by light.ColorRGBf when the color value is invalid.
var ErrMalformedColor = errors.New("Malformed color in light")

// A Light represents a bulb.
type Light struct {
	ID         int    `json:"id" db:"id"`
	BridgeID   int    `json:"bridgeId" db:"bridge_id"`
	GroupID    int    `json:"groupId" db:"group_id"`
	InternalID string `json:"internalId" db:"internal_id"`
	Name       string `json:"name" db:"name"`
	On         bool   `json:"on" db:"enabled"`
	Color      string `json:"color" db:"color"`
	Brightness uint8  `json:"brightness" db:"brightness"`
}

// SetColorRGB sets the color with an RGB value.
func (light *Light) SetColorRGB(r, g, b uint8) {
	light.Color = hex.EncodeToString([]byte{r, g, b})
}

// SetColorRGBf sets the color with an RGB value as floats between `0.0` and `1.0`.
func (light *Light) SetColorRGBf(r, g, b float64) {
	light.SetColorRGB(uint8(r*255), uint8(g*255), uint8(b*255))
}

// ColorRGB gets the RGB values.
func (light *Light) ColorRGB() (r, g, b uint8, err error) {

	if light.Color == "" {
		return 0, 0, 0, nil
	}

	bytes, err := hex.DecodeString(light.Color)
	if err != nil || len(bytes) != 3 {
		return 0, 0, 0, ErrMalformedColor
	}

	return bytes[0], bytes[1], bytes[2], nil
}

// ColorRGBf returns the float values of the RGB color.
func (light *Light) ColorRGBf() (r, g, b float64, err error) {
	r8, g8, b8, err := light.ColorRGB()
	if err != nil {
		return 0, 0, 0, err
	}
	return float64(r8) / 255, float64(g8) / 255, float64(b8) / 255, nil
}

// LightRepository is an interface for all database operations
// the Light model makes.
type LightRepository interface {
	FindByID(ctx context.Context, id int) (Light, error)
	FindByInternalID(ctx context.Context, internalID string) (Light, error)
	List(ctx context.Context) ([]Light, error)
	ListByBridge(ctx context.Context, bridge Bridge) ([]Light, error)
	ListByGroup(ctx context.Context, group Group) ([]Light, error)
	Insert(ctx context.Context, light Light) (Light, error)
	Update(ctx context.Context, light Light) error
	Remove(ctx context.Context, light Light) error
}