package directive

import (
	"fmt"

	"gitea.nik4nao.com/nik/home-services/alexa-bridge/internal/alexa"
)

func slotValue(slots map[string]alexa.Slot, name string) (string, error) {
	s, ok := slots[name]
	if !ok || s.Value == "" {
		return "", fmt.Errorf("missing or empty slot %q", name)
	}
	return s.Value, nil
}

func brightnessParams(slots map[string]alexa.Slot) (map[string]any, error) {
	v, err := slotValue(slots, "Brightness")
	if err != nil {
		return nil, err
	}
	return map[string]any{"brightness_pct": v}, nil
}

func colorTempParams(slots map[string]alexa.Slot) (map[string]any, error) {
	v, err := slotValue(slots, "ColorTemp")
	if err != nil {
		return nil, err
	}
	return map[string]any{"color_temp_kelvin": v}, nil
}

// colorParams reads three separate numeric slots (Red/Green/Blue) rather
// than a single named-color slot. A nicer "set it to warm white" voice UX
// would need a custom slot type mapping color names to RGB triples — an
// interaction-model addition, not a backend gap — deliberately left for
// later rather than inventing a name/RGB table here.
func colorParams(slots map[string]alexa.Slot) (map[string]any, error) {
	r, err := slotValue(slots, "Red")
	if err != nil {
		return nil, err
	}
	g, err := slotValue(slots, "Green")
	if err != nil {
		return nil, err
	}
	b, err := slotValue(slots, "Blue")
	if err != nil {
		return nil, err
	}
	return map[string]any{"rgb_color": map[string]any{"r": r, "g": g, "b": b}}, nil
}

func hvacModeParams(slots map[string]alexa.Slot) (map[string]any, error) {
	v, err := slotValue(slots, "HVACMode")
	if err != nil {
		return nil, err
	}
	return map[string]any{"hvac_mode": v}, nil
}

// temperatureParams backs SetTemperatureIntent, added alongside
// ClimateService.SetTemperature — see plan.md's "Decisions on open
// questions" #1.
func temperatureParams(slots map[string]alexa.Slot) (map[string]any, error) {
	v, err := slotValue(slots, "Temperature")
	if err != nil {
		return nil, err
	}
	return map[string]any{"target_temperature": v}, nil
}