package main

import (
	intrgb "netdome.biz/paul/qmk-rgb/internal/rgb"
	"netdome.biz/paul/qmk-rgb/internal/via"
)

func selectedZones() ([]intrgb.Zone, error) {
	if targetZone == "" {
		return intrgb.AllZones(), nil
	}
	zone, err := intrgb.ParseZone(targetZone)
	if err != nil {
		return nil, err
	}
	return []intrgb.Zone{zone}, nil
}

func zoneChannels(zones []intrgb.Zone) []via.LEDType {
	var channels []via.LEDType
	for _, zone := range zones {
		channels = append(channels, via.LEDType(zone.Channel()))
	}
	return channels
}

// filterZones keeps the zones that appear in selected, preserving the order
// of candidates. It neither adds nor removes zones on its own: a zone the
// caller does not offer stays absent, so a profile that omits a zone is not
// padded with defaults.
func filterZones(candidates, selected []intrgb.Zone) []intrgb.Zone {
	keep := make(map[intrgb.Zone]bool, len(selected))
	for _, zone := range selected {
		keep[zone] = true
	}

	filtered := make([]intrgb.Zone, 0, len(candidates))
	for _, zone := range candidates {
		if keep[zone] {
			filtered = append(filtered, zone)
		}
	}
	return filtered
}