package test

import (
	"context"
	"testing"

	"github.com/seaweedfs/seaweedfs/weed/credential"
	"github.com/seaweedfs/seaweedfs/weed/credential/memory"
	"github.com/seaweedfs/seaweedfs/weed/pb/iam_pb"
	"github.com/seaweedfs/seaweedfs/weed/s3api/policy_engine"

	_ "github.com/seaweedfs/seaweedfs/weed/credential/filer_etc"
	_ "github.com/seaweedfs/seaweedfs/weed/credential/memory"
	_ "github.com/seaweedfs/seaweedfs/weed/credential/postgres"
)

func TestInlinePolicyOperations(t *testing.T) {
	ctx := context.Background()

	credentialManager, err := credential.NewCredentialManager(credential.StoreTypeMemory, nil, "")
	if err != nil {
		t.Fatalf("Failed to create credential manager: %v", err)
	}

	store, ok := credentialManager.GetStore().(*memory.MemoryStore)
	if !ok {
		t.Fatal("Store is not a memory store")
	}

	userName := "testuser"
	policyName := "read-bucket"
	doc := policy_engine.PolicyDocument{
		Version: "2012-10-17",
		Statement: []policy_engine.PolicyStatement{
			{
				Effect:   policy_engine.PolicyEffectAllow,
				Action:   policy_engine.NewStringOrStringSlice("s3:GetObject"),
				Resource: policy_engine.NewStringOrStringSlicePtr("arn:aws:s3:::test-bucket/*"),
			},
		},
	}

	// Put
	if err := store.PutUserInlinePolicy(ctx, userName, policyName, doc); err != nil {
		t.Fatalf("PutUserInlinePolicy failed: %v", err)
	}

	// Get
	got, err := store.GetUserInlinePolicy(ctx, userName, policyName)
	if err != nil {
		t.Fatalf("GetUserInlinePolicy failed: %v", err)
	}
	if got == nil {
		t.Fatal("GetUserInlinePolicy returned nil")
	}
	if got.Version != "2012-10-17" {
		t.Errorf("Expected version '2012-10-17', got '%s'", got.Version)
	}
	if len(got.Statement) != 1 {
		t.Errorf("Expected 1 statement, got %d", len(got.Statement))
	}

	// Get non-existent
	missing, err := store.GetUserInlinePolicy(ctx, userName, "no-such-policy")
	if err != nil {
		t.Fatalf("GetUserInlinePolicy for missing policy failed: %v", err)
	}
	if missing != nil {
		t.Error("Expected nil for non-existent policy")
	}

	// Put second policy, same user
	doc2 := policy_engine.PolicyDocument{
		Version: "2012-10-17",
		Statement: []policy_engine.PolicyStatement{
			{
				Effect:   policy_engine.PolicyEffectAllow,
				Action:   policy_engine.NewStringOrStringSlice("s3:PutObject"),
				Resource: policy_engine.NewStringOrStringSlicePtr("arn:aws:s3:::other-bucket/*"),
			},
		},
	}
	if err := store.PutUserInlinePolicy(ctx, userName, "write-bucket", doc2); err != nil {
		t.Fatalf("PutUserInlinePolicy second policy failed: %v", err)
	}

	// List
	names, err := store.ListUserInlinePolicies(ctx, userName)
	if err != nil {
		t.Fatalf("ListUserInlinePolicies failed: %v", err)
	}
	if len(names) != 2 {
		t.Errorf("Expected 2 policies, got %d", len(names))
	}

	// List for non-existent user
	emptyNames, err := store.ListUserInlinePolicies(ctx, "nobody")
	if err != nil {
		t.Fatalf("ListUserInlinePolicies for missing user failed: %v", err)
	}
	if len(emptyNames) != 0 {
		t.Errorf("Expected 0 policies for missing user, got %d", len(emptyNames))
	}

	// LoadInlinePolicies (bulk)
	all, err := store.LoadInlinePolicies(ctx)
	if err != nil {
		t.Fatalf("LoadInlinePolicies failed: %v", err)
	}
	if len(all) != 1 {
		t.Errorf("Expected 1 user in LoadInlinePolicies, got %d", len(all))
	}
	if len(all[userName]) != 2 {
		t.Errorf("Expected 2 policies for user in LoadInlinePolicies, got %d", len(all[userName]))
	}

	// Overwrite existing policy (upsert)
	updatedDoc := policy_engine.PolicyDocument{
		Version: "2012-10-17",
		Statement: []policy_engine.PolicyStatement{
			{
				Effect:   policy_engine.PolicyEffectDeny,
				Action:   policy_engine.NewStringOrStringSlice("s3:GetObject"),
				Resource: policy_engine.NewStringOrStringSlicePtr("arn:aws:s3:::test-bucket/secret/*"),
			},
		},
	}
	if err := store.PutUserInlinePolicy(ctx, userName, policyName, updatedDoc); err != nil {
		t.Fatalf("PutUserInlinePolicy overwrite failed: %v", err)
	}
	overwritten, err := store.GetUserInlinePolicy(ctx, userName, policyName)
	if err != nil {
		t.Fatalf("GetUserInlinePolicy after overwrite failed: %v", err)
	}
	if overwritten.Statement[0].Effect != policy_engine.PolicyEffectDeny {
		t.Errorf("Expected Deny after overwrite, got %s", overwritten.Statement[0].Effect)
	}

	// Delete one policy
	if err := store.DeleteUserInlinePolicy(ctx, userName, policyName); err != nil {
		t.Fatalf("DeleteUserInlinePolicy failed: %v", err)
	}
	deleted, err := store.GetUserInlinePolicy(ctx, userName, policyName)
	if err != nil {
		t.Fatalf("GetUserInlinePolicy after delete failed: %v", err)
	}
	if deleted != nil {
		t.Error("Expected nil after delete")
	}

	// Remaining policy still there
	remaining, err := store.ListUserInlinePolicies(ctx, userName)
	if err != nil {
		t.Fatalf("ListUserInlinePolicies after delete failed: %v", err)
	}
	if len(remaining) != 1 {
		t.Errorf("Expected 1 remaining policy, got %d", len(remaining))
	}

	// Delete last policy — user entry should be cleaned up
	if err := store.DeleteUserInlinePolicy(ctx, userName, "write-bucket"); err != nil {
		t.Fatalf("DeleteUserInlinePolicy last policy failed: %v", err)
	}
	allAfter, err := store.LoadInlinePolicies(ctx)
	if err != nil {
		t.Fatalf("LoadInlinePolicies after full cleanup failed: %v", err)
	}
	if len(allAfter) != 0 {
		t.Errorf("Expected empty LoadInlinePolicies after cleanup, got %d users", len(allAfter))
	}
}

// TestMemoryRenameUserMovesIdentityAndPolicies exercises the new
// credential.UserRenamer path on the memory store: the identity row,
// its access keys, and any inline policies all have to land under the
// new name in a single operation.
func TestMemoryRenameUserMovesIdentityAndPolicies(t *testing.T) {
	ctx := context.Background()

	cm, err := credential.NewCredentialManager(credential.StoreTypeMemory, nil, "")
	if err != nil {
		t.Fatalf("Failed to create credential manager: %v", err)
	}

	const (
		oldName    = "renameme"
		newName    = "renamed"
		policyName = "ReadBucket"
	)

	cred := &iam_pb.Credential{AccessKey: "AKIA-RENAME", SecretKey: "secret"}
	if err := cm.CreateUser(ctx, &iam_pb.Identity{
		Name:        oldName,
		Credentials: []*iam_pb.Credential{cred},
	}); err != nil {
		t.Fatalf("CreateUser failed: %v", err)
	}
	doc := policy_engine.PolicyDocument{
		Version: "2012-10-17",
		Statement: []policy_engine.PolicyStatement{{
			Effect:   policy_engine.PolicyEffectAllow,
			Action:   policy_engine.NewStringOrStringSlice("s3:GetObject"),
			Resource: policy_engine.NewStringOrStringSlicePtr("arn:aws:s3:::bucket/*"),
		}},
	}
	if err := cm.PutUserInlinePolicy(ctx, oldName, policyName, doc); err != nil {
		t.Fatalf("PutUserInlinePolicy failed: %v", err)
	}

	supported, err := cm.RenameUser(ctx, oldName, newName)
	if err != nil {
		t.Fatalf("RenameUser failed: %v", err)
	}
	if !supported {
		t.Fatal("memory store should implement credential.UserRenamer")
	}

	if _, err := cm.GetUser(ctx, oldName); err == nil {
		t.Errorf("expected old user %q to be gone after rename", oldName)
	}
	got, err := cm.GetUser(ctx, newName)
	if err != nil {
		t.Fatalf("GetUser(%q) after rename failed: %v", newName, err)
	}
	if got.Name != newName {
		t.Errorf("renamed identity name = %q, want %q", got.Name, newName)
	}
	if len(got.Credentials) != 1 || got.Credentials[0].AccessKey != cred.AccessKey {
		t.Errorf("renamed identity should still own its access key, got %+v", got.Credentials)
	}

	gotByKey, err := cm.GetUserByAccessKey(ctx, cred.AccessKey)
	if err != nil {
		t.Fatalf("GetUserByAccessKey failed: %v", err)
	}
	if gotByKey == nil || gotByKey.Name != newName {
		t.Errorf("access key should resolve to %q, got %+v", newName, gotByKey)
	}

	gotPolicy, err := cm.GetUserInlinePolicy(ctx, newName, policyName)
	if err != nil {
		t.Fatalf("GetUserInlinePolicy under new name failed: %v", err)
	}
	if gotPolicy == nil {
		t.Fatal("inline policy should be readable under the new name")
	}
	if gotPolicy.Statement[0].Effect != policy_engine.PolicyEffectAllow {
		t.Errorf("policy effect: got %q want %q", gotPolicy.Statement[0].Effect, policy_engine.PolicyEffectAllow)
	}
	stalePolicy, err := cm.GetUserInlinePolicy(ctx, oldName, policyName)
	if err != nil {
		t.Fatalf("GetUserInlinePolicy under old name failed: %v", err)
	}
	if stalePolicy != nil {
		t.Errorf("inline policy should be gone from the old name, got %+v", stalePolicy)
	}

	// Clean up — NewCredentialManager hands out a shared MemoryStore singleton
	// so leftover state would leak into TestMemoryStoreIntegration.
	if err := cm.DeleteUserInlinePolicy(ctx, newName, policyName); err != nil {
		t.Fatalf("DeleteUserInlinePolicy cleanup failed: %v", err)
	}
	if err := cm.DeleteUser(ctx, newName); err != nil {
		t.Fatalf("DeleteUser cleanup failed: %v", err)
	}
}