package automation

import (
	"fmt"
	"regexp"
	"strings"
)

// matchProxies filters proxies down to those satisfying every non-empty
// dimension of m. Returns an error if m.NamePattern is an invalid regexp.
func matchProxies(proxies []ProxyRef, m MatchRule) ([]ProxyRef, error) {
	var namePattern *regexp.Regexp
	if m.NamePattern != "" {
		re, err := regexp.Compile(m.NamePattern)
		if err != nil {
			return nil, fmt.Errorf("invalid match.name-pattern %q: %w", m.NamePattern, err)
		}
		namePattern = re
	}

	var out []ProxyRef
	for _, p := range proxies {
		if len(m.Subscriptions) > 0 && !containsFold(m.Subscriptions, p.Subscription) {
			continue
		}
		if namePattern != nil && !namePattern.MatchString(p.OriginalName) {
			continue
		}
		out = append(out, p)
	}
	return out, nil
}

func containsFold(list []string, s string) bool {
	for _, item := range list {
		if strings.EqualFold(item, s) {
			return true
		}
	}
	return false
}