Lots of changes, still more to do

handlers/ticket_matcher.go

@@ -0,0 +1,44 @@
+package handlers
+
+import (
+	"synlotto-website/models"
+)
+
+func MatchTicketToDraw(ticket models.Ticket, draw models.DrawResult, rules []models.PrizeRule) models.MatchResult {
+	mainMatches := countMatches(ticket.Balls, draw.Balls)
+	bonusMatches := countMatches(ticket.BonusBalls, draw.BonusBalls)
+
+	prizeTier := getPrizeTier(ticket.GameType, mainMatches, bonusMatches, rules)
+	isWinner := prizeTier != ""
+
+	return models.MatchResult{
+		MatchedDrawID: draw.DrawID,
+		MatchedMain:   mainMatches,
+		MatchedBonus:  bonusMatches,
+		PrizeTier:     prizeTier,
+		IsWinner:      isWinner,
+	}
+}
+
+func countMatches(a, b []int) int {
+	m := make(map[int]bool)
+	for _, n := range b {
+		m[n] = true
+	}
+	match := 0
+	for _, n := range a {
+		if m[n] {
+			match++
+		}
+	}
+	return match
+}
+
+func getPrizeTier(game string, main, bonus int, rules []models.PrizeRule) string {
+	for _, rule := range rules {
+		if rule.Game == game && rule.MainMatches == main && rule.BonusMatches == bonus {
+			return rule.Tier
+		}
+	}
+	return ""
+}