package permissions

// permission_resolution_test.go — Test plan for Section 6: Permission Resolution (Fix for RC5)
//
// Design ref: SECURITY_REFACTOR_DESIGN.md §6
// Coverage target:
//   6.1  Muting scope: muting in PSG-A does NOT affect PSG-B or Profile permissions
//   6.2  PSG component PermSets included in object/field permission queries
//   6.3  Spurious JOIN removed from Layer 4 system-permission query
//   6.4  Cache invalidation on GrantProfilePermission / RevokeProfilePermission
//   8.1  GetRoleDescendants terminates on circular role hierarchy
//   8.2  Webhook URL SSRF prevention
//
// HOW TO RUN:
//   go test ./internal/features/permissions/ -run TestPermissionResolution -v

import (
	"strconv"
	"testing"
	"time"

	"github.com/nexuscrm/shared/pkg/models"
)

// ---------------------------------------------------------------------------
// Section 6.1 — Muting scope: scoped to parent PSG only (DA1-1 fix)
// ---------------------------------------------------------------------------

// TestMuting_PSG_A_MutedPermDoesNotAffectPermissionsFromPSG_B verifies the
// core RC5 muting fix: muting a permission inside PSG-A must NOT delete that
// permission from the effective set when PSG-B independently grants it.
//
// NOTE: This test requires SQL-level per-PSG muting logic that is embedded in
// getGroupSystemPermissions (repository layer). Unit-testing it requires either
// a full DB integration test or refactoring the function to accept injectable
// per-PSG data. Kept as skip pending that refactor.
func TestMuting_PSG_A_MutedPermDoesNotAffectPermissionsFromPSG_B(t *testing.T) {
	t.Skip("requires per-PSG muting injection — implement as integration test or after refactoring getGroupSystemPermissions")
}

// TestMuting_PSG_A_MutedPermDoesNotAffectProfileLevelPermissions verifies that
// muting inside a PSG does NOT revoke permissions granted at the Profile level.
//
// NOTE: Same infrastructure dependency as above.
func TestMuting_PSG_A_MutedPermDoesNotAffectProfileLevelPermissions(t *testing.T) {
	t.Skip("requires per-PSG muting injection — implement as integration test or after refactoring getGroupSystemPermissions")
}

// TestMuting_WithinSinglePSG_MutedPermIsAbsent verifies the positive case:
// when a PSG has only one PermSet (grants X) and a MutingPermSet (mutes X),
// X is NOT in the effective set for that PSG.
//
// NOTE: Same infrastructure dependency as above.
func TestMuting_WithinSinglePSG_MutedPermIsAbsent(t *testing.T) {
	t.Skip("requires per-PSG muting injection — implement as integration test or after refactoring getGroupSystemPermissions")
}

// ---------------------------------------------------------------------------
// Section 6.2 — PSG component PermSets in object/field permission queries (DA1-2 fix)
// ---------------------------------------------------------------------------

// TestObjectPermission_ResolvesPermissionsFromPSGComponentPermSets verifies that
// effective object permissions include permissions granted via a PSG's component
// PermissionSets (the third UNION branch added to perm_object_field.go).
//
// NOTE: The SQL UNION behavior is in the repository layer. Unit-testing via
// mockPermRepo.loadEffectiveObjectPerm works only if the mock returns pre-built
// results. The actual UNION correctness requires a DB integration test.
func TestObjectPermission_ResolvesPermissionsFromPSGComponentPermSets(t *testing.T) {
	t.Skip("requires SQL integration test — the three-UNION behavior is in the repository layer")
}

// TestFieldPermission_ResolvesPermissionsFromPSGComponentPermSets verifies the
// same PSG component fix applies to field-level permissions.
func TestFieldPermission_ResolvesPermissionsFromPSGComponentPermSets(t *testing.T) {
	t.Skip("requires SQL integration test — the three-UNION behavior is in the repository layer")
}

// ---------------------------------------------------------------------------
// Section 6.4 — Cache invalidation on permission mutations (DA1-4 fix)
// ---------------------------------------------------------------------------

// mockPermCache implements ObjectFieldPermCache for tracking Invalidate calls.
type mockPermCache struct {
	invalidateCalled     int
	invalidateUserCalled []string
}

func (c *mockPermCache) GetObjectPermission(userID, profileID, objectAPIName string) (*models.ObjectPermissions, bool) {
	return nil, false
}
func (c *mockPermCache) GetFieldPermission(userID, profileID, objectAPIName, fieldAPIName string) (*models.FieldPermissions, bool) {
	return nil, false
}
func (c *mockPermCache) HasObjectPermsLoaded(userID, profileID string) bool { return false }
func (c *mockPermCache) HasFieldPermsLoaded(userID, profileID string) bool  { return false }
func (c *mockPermCache) InvalidateUser(userID string) {
	c.invalidateUserCalled = append(c.invalidateUserCalled, userID)
}
func (c *mockPermCache) Invalidate() {
	c.invalidateCalled++
}

// ---------------------------------------------------------------------------
// Section 8.1 — GetRoleDescendants: cycle detection (C7 / DoS fix)
// ---------------------------------------------------------------------------

// TestGetRoleDescendants_CircularHierarchy_DoesNotHang verifies that a circular
// role hierarchy (A → B → A) does not cause infinite recursion or unbounded
// CPU consumption. GetRoleDescendants must terminate and return a finite result.
func TestGetRoleDescendants_CircularHierarchy_DoesNotHang(t *testing.T) {
	// NOTE: This test is EXECUTABLE NOW (pure in-memory logic via newTestService).
	// It will hang if GetRoleDescendants has no cycle guard.
	aParent := "B"
	bParent := "A"
	cache := map[string]*string{
		"A": &aParent,
		"B": &bParent,
	}

	ps := newTestService(&mockPermRepo{}, &mockUserRepo{}, cache)

	// Run in a goroutine with a timeout to detect infinite loops
	done := make(chan []string, 1)
	go func() {
		done <- ps.GetRoleDescendants("A")
	}()

	select {
	case result := <-done:
		// Terminated successfully — verify result is bounded
		if len(result) > 100 {
			t.Errorf("GetRoleDescendants returned unexpectedly large result for circular hierarchy: %d items", len(result))
		}
	case <-timeoutChan(2): // 2-second timeout
		t.Fatal("GetRoleDescendants did not terminate — cycle detection is missing")
	}
}

// TestGetRoleDescendants_SelfReferentialRole_DoesNotHang verifies that a role
// pointing to itself (A.parent=A) is also handled safely.
func TestGetRoleDescendants_SelfReferentialRole_DoesNotHang(t *testing.T) {
	selfRef := "A"
	cache := map[string]*string{
		"A": &selfRef,
	}
	ps := newTestService(&mockPermRepo{}, &mockUserRepo{}, cache)

	done := make(chan []string, 1)
	go func() {
		done <- ps.GetRoleDescendants("A")
	}()

	select {
	case <-done:
		// terminated — pass
	case <-timeoutChan(2):
		t.Fatal("GetRoleDescendants did not terminate for self-referential role")
	}
}

// TestGetRoleDescendants_LongChain_Terminates verifies that a long but acyclic
// chain (depth 100) terminates correctly without issues.
func TestGetRoleDescendants_LongChain_Terminates(t *testing.T) {
	// Build a chain: role0 ← role1 ← role2 ← ... ← role99
	cache := make(map[string]*string, 100)
	cache["role0"] = nil // root
	for i := 1; i < 100; i++ {
		parent := roleIDStr(i - 1)
		child := roleIDStr(i)
		p := parent
		cache[child] = &p
	}

	ps := newTestService(&mockPermRepo{}, &mockUserRepo{}, cache)
	got := ps.GetRoleDescendants(roleIDStr(0))

	if len(got) != 99 {
		t.Errorf("expected 99 descendants for depth-100 chain, got %d", len(got))
	}
}

// ---------------------------------------------------------------------------
// Section 8.2 — Webhook SSRF prevention
// ---------------------------------------------------------------------------

// TestWebhookURL_RejectsLoopbackAddress — lives in automation package.
func TestWebhookURL_RejectsLoopbackAddress(t *testing.T) {
	t.Skip("test lives in automation package — placeholder here for plan completeness")
}

// TestWebhookURL_RejectsPrivateIPRange — lives in automation package.
func TestWebhookURL_RejectsPrivateIPRange(t *testing.T) {
	t.Skip("test lives in automation package")
}

// TestWebhookURL_RejectsHTTPScheme — lives in automation package.
func TestWebhookURL_RejectsHTTPScheme(t *testing.T) {
	t.Skip("test lives in automation package")
}

// TestWebhookURL_AllowsPublicHTTPS — lives in automation package; requires DNS.
func TestWebhookURL_AllowsPublicHTTPS(t *testing.T) {
	t.Skip("test lives in automation package; requires DNS access")
}

// ---------------------------------------------------------------------------
// Helpers used by cycle-detection tests
// ---------------------------------------------------------------------------

// timeoutChan returns a channel that closes after `seconds` seconds.
func timeoutChan(seconds int) <-chan struct{} {
	ch := make(chan struct{})
	go func() {
		time.Sleep(time.Duration(seconds) * time.Second)
		close(ch)
	}()
	return ch
}

// roleIDStr returns a stable role ID string for test chain generation.
func roleIDStr(n int) string {
	return "role" + strconv.Itoa(n)
}