package engine

import (
	"path"
	"strings"

	"aiaa-notification-service/internal/model"
)

// PickEventRule selects the best enabled rule for an event.
// Exact event wins; otherwise glob patterns (* and ?) via path.Match.
// Among globs, more literal characters win; ties go to the smaller ID.
func PickEventRule(event string, rules []model.Rule) *model.Rule {
	var exact *model.Rule
	var best *model.Rule
	bestScore := -1
	for i := range rules {
		r := &rules[i]
		if r.Enabled == 0 {
			continue
		}
		if r.Event == event {
			if exact == nil || r.ID < exact.ID {
				exact = r
			}
			continue
		}
		if !strings.ContainsAny(r.Event, "*?") {
			continue
		}
		ok, err := path.Match(r.Event, event)
		if err != nil || !ok {
			continue
		}
		score := globSpecificity(r.Event)
		if score > bestScore || (score == bestScore && (best == nil || r.ID < best.ID)) {
			bestScore = score
			best = r
		}
	}
	if exact != nil {
		return exact
	}
	return best
}

func globSpecificity(pattern string) int {
	n := 0
	for _, r := range pattern {
		if r != '*' && r != '?' {
			n++
		}
	}
	return n
}