/*
 * Copyright (c) 2025 Huawei Device Co., Ltd.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import * as arkts from '@koalaui/libarkts';
import { getAnnotationUsage, PresetDecorators } from '../utils';
import { UISyntaxRule } from './ui-syntax-rule';

const rule: UISyntaxRule = {
  name: 'struct-missing-decorator',
  messages: {
    missingComponentDecorator: `struct '{{structName}}' is missing '@Component' or '@CustomDialog' decorators`,
    misusedPreview: `struct '{{structName}}' misused '@Preview' decorator. it should be decorated by '@Component' or '@CustomDialog'`,
    misusedObserved: `struct '{{structName}}' misused '@Observed' decorator. it should be decorated by '@Component' or '@CustomDialog'`,
  },
  setup(context) {
    function hasDecorator(node: arkts.StructDeclaration, decorator: string): boolean {
      return !!getAnnotationUsage(node, decorator);
    }

    return {
      parsed: (node): void => {
        if (!arkts.isStructDeclaration(node)) {
          return;
        }
        // Check for the presence of specific decorators on the struct
        const structName = node.definition.ident?.name ?? '';
        const structNode = node.definition.ident;
        const hasComponent = hasDecorator(node, PresetDecorators.COMPONENT_V1);
        const hasComponentV2 = hasDecorator(node, PresetDecorators.COMPONENT_V2);
        const hasCustomDialog = hasDecorator(node, PresetDecorators.CUSTOM_DIALOG);
        const hasPreview = getAnnotationUsage(node, PresetDecorators.PREVIEW);
        const hasObserved = getAnnotationUsage(node, PresetDecorators.OBSERVED_V1);
        // If no valid component decorators (@Component or @CustomDialog) are found
        if (!hasComponent && !hasComponentV2 && !hasCustomDialog && structNode) {
          context.report({
            node: structNode,
            message: rule.messages.missingComponentDecorator,
            data: { structName },
          });
        }
        // If the @Preview decorator is used but the struct is not decorated with @Component or @CustomDialog
        if (hasPreview && !hasComponent && !hasComponentV2 && !hasCustomDialog && structNode) {
          context.report({
            node: structNode,
            message: rule.messages.misusedPreview,
            data: { structName },
          });
        }
        // If the @Observed decorator is used but the struct is not decorated with @Component or @CustomDialog
        if (hasObserved && !hasComponent && !hasComponentV2 && !hasCustomDialog && structNode) {
          context.report({
            node: structNode,
            message: rule.messages.misusedObserved,
            data: { structName },
          });
        }
      },
    };
  },
};

export default rule;