package autoassignment

import "github.com/gochat/gochat/internal/model"

// AssignmentPolicyType defines the type of auto-assignment policy.
type AssignmentPolicyType string

const (
	// PolicyRoundRobin assigns conversations to agents in round-robin order.
	// Reference: Chatwoot InboxRoundRobinService
	PolicyRoundRobin AssignmentPolicyType = "round_robin"

	// PolicyLowestLoad assigns conversations to the agent with the
	// fewest currently open conversations.
	// This implements Chatwoot's balanced assignment order.
	PolicyLowestLoad AssignmentPolicyType = "lowest_load"
)

// EffectivePolicy maps the persisted Chatwoot assignment order to its runtime
// selector. Balanced assignment remains feature-gated like upstream Chatwoot.
func EffectivePolicy(policy *model.AssignmentPolicy, advancedAssignment bool) AssignmentPolicyType {
	if policy != nil && policy.AssignmentOrder == 1 && advancedAssignment {
		return PolicyLowestLoad
	}
	return PolicyRoundRobin
}

// EffectiveLimit returns the linked policy's fair-distribution limit.
func EffectiveLimit(policy *model.AssignmentPolicy) int {
	if policy != nil && policy.FairDistributionLimit > 0 {
		return policy.FairDistributionLimit
	}
	return 5
}

// EffectiveWindow returns the linked policy's rate-limit window in seconds.
func EffectiveWindow(policy *model.AssignmentPolicy) int {
	if policy != nil && policy.FairDistributionWindow > 0 {
		return policy.FairDistributionWindow
	}
	return 300
}