package rgb

import "fmt"

type Zone string

const (
	ZoneLogo      Zone = "logo"
	ZoneBacklight Zone = "backlight"
	ZoneSide      Zone = "side"
)

type EffectTarget struct {
	Zone Zone
	ID   uint8
}

var impact80BacklightEffects = [...]string{
	"none",
	"solid_color",
	"alphas_mods",
	"gradient_up_down",
	"gradient_left_right",
	"breathing",
	"band_sat",
	"band_val",
	"band_pinwheel_sat",
	"band_pinwheel_val",
	"band_spiral_sat",
	"band_spiral_val",
	"cycle_all",
	"cycle_left_right",
	"cycle_up_down",
	"cycle_out_in",
	"cycle_out_in_dual",
	"rainbow_moving_chevron",
	"cycle_pinwheel",
	"cycle_spiral",
	"dual_beacon",
	"rainbow_beacon",
	"rainbow_pinwheels",
	"flower_blooming",
	"raindrops",
	"jellybean_raindrops",
	"hue_breathing",
	"hue_pendulum",
	"hue_wave",
	"pixel_flow",
	"digital_rain",
	"solid_reactive",
	"solid_reactive_wide",
	"solid_reactive_multiwide",
	"solid_reactive_cross",
	"solid_reactive_multicross",
	"solid_reactive_nexus",
	"solid_reactive_multinexus",
	"splash",
	"multisplash",
	"solid_splash",
	"solid_multisplash",
	"starlight",
	"starlight_dual_hue",
	"starlight_dual_sat",
	"riverflow",
}

var impact80LogoEffects = [...]string{
	"none",
	"wave",
	"fixed_wave",
	"spectrum",
	"breathing",
	"light",
	"shutdown",
}

var impact80SideEffects = [...]string{
	"none",
	"wave",
	"fixed_wave",
	"spectrum",
	"breathing",
	"light",
	"shutdown",
}

var impact80EffectAliases = map[Zone]map[string]string{
	ZoneLogo: {
		"off":          "none",
		"breathe":      "breathing",
		"rainbow":      "spectrum",
		"rainbow_wave": "wave",
		"solid":        "light",
	},
	ZoneBacklight: {
		"off":     "none",
		"breathe": "breathing",
		"rainbow": "rainbow_moving_chevron",
		"solid":   "solid_color",
	},
	ZoneSide: {
		"off":          "none",
		"breathe":      "breathing",
		"rainbow":      "spectrum",
		"rainbow_wave": "wave",
		"solid":        "light",
	},
}

func AllZones() []Zone {
	return []Zone{ZoneLogo, ZoneBacklight, ZoneSide}
}

func ParseZone(value string) (Zone, error) {
	zone := Zone(value)
	switch zone {
	case ZoneLogo, ZoneBacklight, ZoneSide:
		return zone, nil
	default:
		return "", fmt.Errorf("unknown zone: %s", value)
	}
}

func (z Zone) Channel() uint8 {
	switch z {
	case ZoneLogo:
		return 2
	case ZoneBacklight:
		return 3
	case ZoneSide:
		return 4
	default:
		return 0
	}
}

func EffectName(zone Zone, id uint8) string {
	names := impact80EffectNames(zone)
	if int(id) >= len(names) {
		return "unknown"
	}
	return names[id]
}

func DefaultEffect(zone Zone) uint8 {
	switch zone {
	case ZoneLogo, ZoneSide:
		return 4
	case ZoneBacklight:
		return 5
	default:
		return 0
	}
}

func ResolveEffect(name string, zones []Zone) ([]EffectTarget, []Zone, error) {
	for _, zone := range zones {
		if impact80EffectNames(zone) == nil {
			return nil, nil, fmt.Errorf("unknown zone: %s", zone)
		}
	}

	known := false
	for _, zone := range AllZones() {
		if _, ok := resolveEffectID(zone, name); ok {
			known = true
			break
		}
	}
	if !known {
		return nil, nil, fmt.Errorf("unknown effect: %s", name)
	}

	explicit := len(zones) == 1
	var targets []EffectTarget
	var skipped []Zone
	for _, zone := range zones {
		id, ok := resolveEffectID(zone, name)
		if !ok {
			if explicit {
				return nil, nil, fmt.Errorf("effect %s is not supported on zone %s", name, zone)
			}
			skipped = append(skipped, zone)
			continue
		}
		targets = append(targets, EffectTarget{Zone: zone, ID: id})
	}
	return targets, skipped, nil
}

func impact80EffectNames(zone Zone) []string {
	switch zone {
	case ZoneLogo:
		return impact80LogoEffects[:]
	case ZoneBacklight:
		return impact80BacklightEffects[:]
	case ZoneSide:
		return impact80SideEffects[:]
	default:
		return nil
	}
}

func resolveEffectID(zone Zone, name string) (uint8, bool) {
	for id, effectName := range impact80EffectNames(zone) {
		if effectName == name {
			return uint8(id), true
		}
	}
	if canonical, ok := impact80EffectAliases[zone][name]; ok {
		return resolveEffectID(zone, canonical)
	}
	return 0, false
}

func Impact80EffectName(value uint8) string {
	return EffectName(ZoneLogo, value)
}

func ParseImpact80Effect(name string) (uint8, error) {
	if name == "static" {
		return 5, nil
	}
	targets, _, err := ResolveEffect(name, []Zone{ZoneLogo})
	if err != nil {
		return 0, err
	}
	return targets[0].ID, nil
}