chore: import clean Agent Desk snapshot (2/7)

internal/ai/runtime/reply_eligibility.go

@@ -0,0 +1,64 @@
+package runtime
+
+import (
+	"crypto/sha256"
+	"encoding/binary"
+	"fmt"
+
+	"agent-desk/internal/models"
+	"agent-desk/internal/pkg/enums"
+
+	"github.com/mlogclub/simple/common/strs"
+)
+
+type replyEligibility struct{}
+
+func newReplyEligibility() *replyEligibility {
+	return &replyEligibility{}
+}
+
+// IsAIAgentRolloutEligible uses a stable conversation bucket so one customer
+// remains consistently inside or outside a gray release throughout a session.
+// Missing legacy values are treated as 100 to preserve existing behavior.
+func IsAIAgentRolloutEligible(conversation models.Conversation, aiAgent models.AIAgent, channel *models.Channel) bool {
+	percent := normalizedRolloutPercent(aiAgent.RolloutPercent)
+	if channel != nil {
+		channelPercent := normalizedRolloutPercent(channel.AIAgentRolloutPercent)
+		if channelPercent < percent {
+			percent = channelPercent
+		}
+	}
+	if percent >= 100 {
+		return true
+	}
+	if conversation.ID <= 0 {
+		return false
+	}
+	seed := fmt.Sprintf("channel=%d;conversation=%d;agent=%d", conversation.ChannelID, conversation.ID, aiAgent.ID)
+	sum := sha256.Sum256([]byte(seed))
+	bucket := int(binary.BigEndian.Uint64(sum[:8]) % 100)
+	return bucket < percent
+}
+
+func normalizedRolloutPercent(percent int) int {
+	if percent <= 0 || percent > 100 {
+		return 100
+	}
+	return percent
+}
+
+func (e *replyEligibility) CanReply(conversation models.Conversation, message models.Message, aiAgent models.AIAgent) bool {
+	if message.SenderType != enums.IMSenderTypeCustomer {
+		return false
+	}
+	if conversation.CurrentAssigneeID > 0 {
+		return false
+	}
+	if aiAgent.ServiceMode == enums.IMConversationServiceModeHumanOnly {
+		return false
+	}
+	if strs.IsBlank(message.Content) {
+		return false
+	}
+	return true
+}