package haclient

import (
	"context"
	"fmt"
	"strings"

	hav1 "gitea.nik4nao.com/nik/home-services/gen/ha/v1"
)

// ExecuteAction implements driven.Controller. It dispatches by entity domain
// (the entity_id prefix up to the first '.') to the matching ha-gateway
// service, then by action within that domain. See alexa-bridge/plan.md's
// action table for the full (domain, action) -> RPC mapping.
func (c *Client) ExecuteAction(ctx context.Context, entityID, action string, params map[string]any) error {
	domain, _, ok := strings.Cut(entityID, ".")
	if !ok {
		return fmt.Errorf("entity id %q has no domain prefix", entityID)
	}

	switch domain {
	case "light":
		return c.executeLightAction(ctx, entityID, action, params)
	case "switch":
		return c.executeSwitchAction(ctx, entityID, action, params)
	case "climate":
		return c.executeClimateAction(ctx, entityID, action, params)
	default:
		return fmt.Errorf("unsupported entity domain %q for entity %q", domain, entityID)
	}
}

func (c *Client) executeLightAction(ctx context.Context, entityID, action string, params map[string]any) error {
	switch action {
	case "turn_on":
		_, err := c.lightClient.TurnOn(ctx, &hav1.TurnOnRequest{
			EntityId:        entityID,
			BrightnessPct:   optUint32(params, "brightness_pct"),
			ColorTempKelvin: optUint32(params, "color_temp_kelvin"),
			RgbColor:        optRGB(params, "rgb_color"),
			Transition:      optUint32(params, "transition"),
		})
		return err
	case "turn_off":
		_, err := c.lightClient.TurnOff(ctx, &hav1.TurnOffRequest{
			EntityId:   entityID,
			Transition: optUint32(params, "transition"),
		})
		return err
	case "toggle":
		_, err := c.lightClient.Toggle(ctx, &hav1.ToggleRequest{EntityId: entityID})
		return err
	case "set_brightness":
		brightness, err := reqUint32(params, "brightness_pct")
		if err != nil {
			return err
		}
		_, err = c.lightClient.TurnOn(ctx, &hav1.TurnOnRequest{EntityId: entityID, BrightnessPct: &brightness})
		return err
	case "set_color_temp":
		colorTemp, err := reqUint32(params, "color_temp_kelvin")
		if err != nil {
			return err
		}
		_, err = c.lightClient.TurnOn(ctx, &hav1.TurnOnRequest{EntityId: entityID, ColorTempKelvin: &colorTemp})
		return err
	case "set_color":
		rgb, err := reqRGB(params, "rgb_color")
		if err != nil {
			return err
		}
		_, err = c.lightClient.TurnOn(ctx, &hav1.TurnOnRequest{EntityId: entityID, RgbColor: rgb})
		return err
	default:
		return fmt.Errorf("unsupported light action %q", action)
	}
}

func (c *Client) executeSwitchAction(ctx context.Context, entityID, action string, _ map[string]any) error {
	req := &hav1.SwitchRequest{EntityId: entityID}
	switch action {
	case "turn_on":
		_, err := c.switchClient.TurnOn(ctx, req)
		return err
	case "turn_off":
		_, err := c.switchClient.TurnOff(ctx, req)
		return err
	case "toggle":
		_, err := c.switchClient.Toggle(ctx, req)
		return err
	default:
		return fmt.Errorf("unsupported switch action %q", action)
	}
}

func (c *Client) executeClimateAction(ctx context.Context, entityID, action string, params map[string]any) error {
	switch action {
	case "turn_on":
		_, err := c.climateClient.TurnOn(ctx, &hav1.ClimateRequest{EntityId: entityID})
		return err
	case "turn_off":
		_, err := c.climateClient.TurnOff(ctx, &hav1.ClimateRequest{EntityId: entityID})
		return err
	case "set_hvac_mode":
		mode, err := reqString(params, "hvac_mode")
		if err != nil {
			return err
		}
		_, err = c.climateClient.SetHVACMode(ctx, &hav1.SetHVACModeRequest{EntityId: entityID, HvacMode: mode})
		return err
	case "increase_temperature":
		_, err := c.climateClient.IncreaseTemperature(ctx, &hav1.ClimateRequest{EntityId: entityID})
		return err
	case "decrease_temperature":
		_, err := c.climateClient.DecreaseTemperature(ctx, &hav1.ClimateRequest{EntityId: entityID})
		return err
	case "set_temperature":
		target, err := reqFloat64(params, "target_temperature")
		if err != nil {
			return err
		}
		_, err = c.climateClient.SetTemperature(ctx, &hav1.SetTemperatureRequest{EntityId: entityID, TargetTemperature: target})
		return err
	default:
		return fmt.Errorf("unsupported climate action %q", action)
	}
}