package light

import (
	"context"

	"git.aiterp.net/lucifer/lucifer/models"
)

var drivers = make(map[string]Driver)

// A Driver that communicates with an underlying lighting system.
type Driver interface {
	// Apply applies all changed lights, which are lights that differ from what Lights returned.
	Apply(ctx context.Context, bridge models.Bridge, lights ...models.Light) error

	// Lights lists all available lights. The `ID` field will the -1.
	Lights(ctx context.Context, bridge models.Bridge) ([]models.Light, error)

	// Bridges lists all available bridges.
	Bridges(ctx context.Context) ([]models.Bridge, error)

	// Connect connects to a bridge, returning the bridge with the API Key.
	Connect(ctx context.Context, bridge models.Bridge) (models.Bridge, error)

	// DiscoverLights asks the bridge to start a search for new lights.
	DiscoverLights(ctx context.Context, bridge models.Bridge) error

	// ForgetLight removes the light from the bridge.
	ForgetLight(ctx context.Context, bridge models.Bridge, light models.Light) error

	// ChangedLights returns a subset of the list describing which lights to update.
	ChangedLights(ctx context.Context, bridge models.Bridge, lights ...models.Light) ([]models.Light, error)

	Buttons(ctx context.Context, bridge models.Bridge) ([]models.Button, error)

	PollButton(ctx context.Context, bridge models.Bridge, button models.Button) (<-chan models.ButtonEvent, error)
}

// RegisterDriver registers a driver. This must happen in init() functions.
func RegisterDriver(name string, driver Driver) {
	drivers[name] = driver
}

// Drivers gets the list of drivers.
func Drivers() []string {
	results := make([]string, len(drivers))

	for key := range drivers {
		results = append(results, key)
	}

	return results
}