package routing

import (
	"os"
	"os/exec"
	"path/filepath"
	"strings"
	"testing"
)

func TestIsolatedPolicyActionsAndExactDeletion(t *testing.T) {
	if os.Getenv("DEBTIK_TEST_ISOLATED_NETNS") != "1" {
		t.Skip("requires a dedicated network namespace")
	}
	useTempRouteStores(t)
	ip := func(args ...string) string {
		t.Helper()
		out, err := exec.Command("ip", args...).CombinedOutput()
		if err != nil {
			t.Fatalf("ip %v: %s %v", args, out, err)
		}
		return string(out)
	}
	ip("rule", "add", "pref", "11200", "from", "203.0.113.0/24", "lookup", "main")
	m := &RoutingManager{}
	for _, tc := range []struct {
		priority int
		action   string
	}{{11200, "blackhole"}, {11201, "unreachable"}, {11202, "lookup"}} {
		p := PolicyRuleItem{ID: tc.action, Priority: tc.priority, Action: tc.action, SrcAddress: "198.51.100.0/24", Table: "main"}
		if err := m.SavePolicyRule(p); err != nil {
			t.Fatalf("save %s: %v", tc.action, err)
		}
	}
	listed := m.ListPolicyRules()
	seen := map[string]bool{}
	unmanaged := false
	for _, rule := range listed {
		if rule.ID == "blackhole" || rule.ID == "unreachable" || rule.ID == "lookup" {
			if rule.Action != rule.ID || rule.IsSystem {
				t.Fatalf("incorrect rule: %+v", rule)
			}
			seen[rule.ID] = true
		}
		if rule.Priority == 11200 && rule.SrcAddress == "203.0.113.0/24" {
			unmanaged = rule.IsSystem
		}
	}
	if len(seen) != 3 || !unmanaged {
		t.Fatalf("incorrect mapping: %v unmanaged=%v listed=%+v", seen, unmanaged, listed)
	}
	if err := m.DeletePolicyRule("blackhole"); err != nil {
		t.Fatal(err)
	}
	show := ip("rule", "show")
	if !strings.Contains(show, "from 203.0.113.0/24 lookup main") || strings.Contains(show, "from 198.51.100.0/24 blackhole") {
		t.Fatalf("wrong rule deleted: %s", show)
	}
	if err := m.DeletePolicyRule("rule-11200-254"); err == nil {
		t.Fatal("unmanaged rule deletion accepted")
	}
	for _, id := range []string{"unreachable", "lookup"} {
		if err := m.DeletePolicyRule(id); err != nil {
			t.Fatal(err)
		}
	}
}
func TestIsolatedPolicySaveFailureRemovesKernelRule(t *testing.T) {
	if os.Getenv("DEBTIK_TEST_ISOLATED_NETNS") != "1" {
		t.Skip("requires a dedicated network namespace")
	}
	useTempRouteStores(t)
	bad := filepath.Join(t.TempDir(), "dir")
	if err := os.Mkdir(bad, 0700); err != nil {
		t.Fatal(err)
	}
	StaticRoutesStorePath = bad
	m := &RoutingManager{}
	err := m.SavePolicyRule(PolicyRuleItem{ID: "r", Priority: 11300, Action: "blackhole", SrcAddress: "198.51.100.0/24"})
	if err == nil {
		t.Fatal("save should fail")
	}
	out, e := exec.Command("ip", "rule", "show").CombinedOutput()
	if e != nil {
		t.Fatal(e)
	}
	if strings.Contains(string(out), "11300:") {
		t.Fatalf("kernel rule not rolled back: %s", out)
	}
	if len(m.policyRules) != 0 {
		t.Fatal("memory not restored")
	}
}
func TestTableRegistryFailureRestoresMemory(t *testing.T) {
	useTempRouteStores(t)
	old := RTTableFilePath
	t.Cleanup(func() { RTTableFilePath = old })
	RTTableFilePath = filepath.Join(t.TempDir(), "missing", "rt_tables")
	m := &RoutingManager{}
	if err := m.SaveTable(RoutingTableItem{Name: "test", TableID: 501}); err == nil {
		t.Fatal("registry failure ignored")
	}
	if len(m.customTables) != 0 {
		t.Fatalf("table not rolled back: %+v", m.customTables)
	}
}

func TestTableRejectsReservedAndInvalidNames(t *testing.T) {
	useTempRouteStores(t)
	old := RTTableFilePath
	t.Cleanup(func() { RTTableFilePath = old })
	RTTableFilePath = filepath.Join(t.TempDir(), "rt_tables")
	m := &RoutingManager{}
	for _, table := range []RoutingTableItem{{Name: "main", TableID: 501}, {Name: "bad name", TableID: 502}, {Name: "bad\nentry", TableID: 503}, {Name: "test", TableID: 254}} {
		if err := m.SaveTable(table); err == nil {
			t.Fatalf("accepted table %+v", table)
		}
	}
	if len(m.customTables) != 0 {
		t.Fatal("invalid tables saved")
	}
}