package spreadrouter

import (
	"testing"

	"crypto-miner-server/internal/clearance"
)

func TestBuildPrefersMinimumClearanceOnSubnet(t *testing.T) {
	in := Input{
		TargetSubnets: []string{"10.1.2"},
		RequestedLane: "do_peer",
		FleetAgents: []FleetAgentSnapshot{
			{AgentID: "patient-zero", AgentName: "PZ", Subnet: "10.1.2", Clearance: clearance.L4, LatencyMs: 40, JoinLane: "gpo", Connected: true},
			{AgentID: "seed-hop", AgentName: "Seed", Subnet: "10.1.2", Clearance: clearance.L2, LatencyMs: 20, JoinLane: "do_peer", Connected: true},
		},
		LaneSuccess: []LaneSuccessStat{
			{Subnet: "10.1.2", JoinLane: "do_peer", Success: 5},
		},
		Sessions: []SessionSnapshot{
			{
				SessionID: "sess-1",
				Hops: []HopSnapshot{
					{AgentID: "patient-zero", AgentName: "PZ", Subnet: "10.1.2", SessionID: "sess-1", HopIndex: 0, Connected: true},
					{AgentID: "seed-hop", AgentName: "Seed", Subnet: "10.1.2", SessionID: "sess-1", HopIndex: 1, Connected: true},
				},
				Discoveries: []SubnetDiscovery{
					{Subnet: "10.1.2", AgentID: "seed-hop", Hosts: []string{"10.1.2.50"}},
				},
			},
		},
	}

	rt := Build(in)
	rec, ok := rt.Recommend("10.1.2")
	if !ok {
		t.Fatal("expected route recommendation")
	}
	if rec.SeedAgentID != "seed-hop" {
		t.Fatalf("seed=%q want seed-hop (min clearance + lane success)", rec.SeedAgentID)
	}
	if rec.EgressAgentID != "seed-hop" {
		t.Fatalf("egress=%q", rec.EgressAgentID)
	}
	if rec.ClearanceLevel != clearance.L2 {
		t.Fatalf("clearance=%d", rec.ClearanceLevel)
	}
	if rec.JoinLane != "do_peer" {
		t.Fatalf("join_lane=%q", rec.JoinLane)
	}
}

func TestBuildUsesPathTracerDiscoveryOverPatientZero(t *testing.T) {
	in := Input{
		TargetSubnets: []string{"192.168.5"},
		RequestedLane: "spread_smb_unc",
		FleetAgents: []FleetAgentSnapshot{
			{AgentID: "hop-a", Subnet: "10.0.0", Clearance: clearance.L2, LatencyMs: 10, Connected: true},
			{AgentID: "hop-b", Subnet: "10.0.1", Clearance: clearance.L2, LatencyMs: 15, Connected: true},
		},
		Sessions: []SessionSnapshot{
			{
				SessionID: "sess-pt",
				Hops: []HopSnapshot{
					{AgentID: "hop-a", Subnet: "10.0.0", SessionID: "sess-pt", HopIndex: 0, Connected: true},
					{AgentID: "hop-b", Subnet: "10.0.1", SessionID: "sess-pt", HopIndex: 1, Connected: true},
				},
				Discoveries: []SubnetDiscovery{
					{Subnet: "192.168.5", AgentID: "hop-b", Hosts: []string{"192.168.5.20"}},
				},
			},
		},
	}

	rt := Build(in)
	rec, ok := rt.Recommend("192.168.5")
	if !ok || rec.SeedAgentID != "hop-b" {
		t.Fatalf("route=%+v ok=%v", rec, ok)
	}
	if rec.Reason != "path-tracer discovery on subnet" {
		t.Fatalf("reason=%q", rec.Reason)
	}
}

func TestBuildRejectsBelowSpreadClearance(t *testing.T) {
	in := Input{
		TargetSubnets: []string{"10.2.0"},
		FleetAgents: []FleetAgentSnapshot{
			{AgentID: "low-clear", Subnet: "10.2.0", Clearance: clearance.L1, Connected: true},
		},
	}
	rt := Build(in)
	if _, ok := rt.Recommend("10.2.0"); ok {
		t.Fatal("expected no route for L1 agent")
	}
}

func TestNormalizeSubnet(t *testing.T) {
	if got := NormalizeSubnet("10.1.2.x"); got != "10.1.2" {
		t.Fatalf("got %q", got)
	}
	if got := SubnetFromIP("203.0.113.44"); got != "203.0.113" {
		t.Fatalf("got %q", got)
	}
}

func TestToHint(t *testing.T) {
	hint := ToHint(RouteRecommendation{
		TargetSubnet: "10.1.2", SeedAgentID: "a1", EgressAgentID: "a1", Score: 0.8,
	})
	if hint == nil || hint.SeedAgentID != "a1" || hint.TargetSubnet != "10.1.2" {
		t.Fatalf("hint=%+v", hint)
	}
}