package handoff

type PolicyContext struct {
	State                string
	Route                string
	HandoffEnabled       bool
	HandoffMode          HandoffMode
	AllowInTestRouteOnly bool
	HasTarget            bool
	AlreadyRequested     bool
}

type PolicyDecision struct {
	Allowed    bool
	StubOnly   bool
	ReasonCode string
	MessageKey string
}

func Authorize(ctx PolicyContext) PolicyDecision {
	if ctx.State == "ENDED" {
		return PolicyDecision{Allowed: false, ReasonCode: "call_ended", MessageKey: "handoff.denied"}
	}
	if ctx.AlreadyRequested || ctx.State == "HANDOFF" {
		return PolicyDecision{Allowed: true, StubOnly: true, ReasonCode: "already_requested", MessageKey: "handoff.already_requested"}
	}
	if ctx.AllowInTestRouteOnly && ctx.Route != "test" {
		return PolicyDecision{Allowed: true, StubOnly: true, ReasonCode: "test_route_only", MessageKey: "handoff.stub"}
	}
	if !ctx.HandoffEnabled {
		return PolicyDecision{Allowed: true, StubOnly: true, ReasonCode: "disabled", MessageKey: "handoff.stub"}
	}
	switch ctx.HandoffMode {
	case HandoffModeDisabledStub:
		return PolicyDecision{Allowed: true, StubOnly: true, ReasonCode: "disabled", MessageKey: "handoff.stub"}
	case HandoffModeHangupAfterMessage:
		return PolicyDecision{Allowed: true, ReasonCode: "ok", MessageKey: "handoff.stub"}
	case HandoffModeARIRedirect, HandoffModeDialplanContinue:
		if !ctx.HasTarget {
			return PolicyDecision{Allowed: true, StubOnly: true, ReasonCode: "not_configured", MessageKey: "handoff.not_configured"}
		}
		return PolicyDecision{Allowed: true, ReasonCode: "ok", MessageKey: "handoff.transfer_started"}
	default:
		return PolicyDecision{Allowed: false, ReasonCode: "unknown_mode", MessageKey: "handoff.denied"}
	}
}