/*
 * Copyright (c) 2023 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 type { SourceFile } from 'typescript';
import { SyntaxKind } from 'typescript';
import type { FunctionEntity } from '../declaration-node/functionDeclaration';
import {
  getCallbackStatement,
  getReturnStatement,
  getWarnConsole,
  getReturnData,
  getOverloadedFunctionCallbackStatement,
  overloadedFunctionArr
} from './generateCommonUtil';

/**
 * generate function
 * @param rootName
 * @param functionArray
 * @param sourceFile
 * @param mockApi
 * @param isRoot
 * @returns
 */
export function generateCommonFunction(
  rootName: string,
  functionArray: Array<FunctionEntity>,
  sourceFile: SourceFile,
  mockApi: string,
  isRoot: boolean
): string {
  let functionBody = '';
  const functionEntity = functionArray[0];
  if (isRoot) {
    functionBody = `const ${functionEntity.functionName} = function(...args) {`;
  } else {
    functionBody = `${functionEntity.functionName}: function(...args) {`;
  }
  functionBody += getWarnConsole(rootName, functionEntity.functionName);

  if (functionArray.length === 1) {
    const args = functionEntity.args;
    const len = args.length;
    if (args.length > 0 && args[len - 1].paramName.toLowerCase().includes('callback')) {
      functionBody += getCallbackStatement(mockApi, args[len - 1]?.paramTypeString);
    }
    if (functionEntity.returnType.returnKind !== SyntaxKind.VoidKeyword) {
      if (rootName === 'featureAbility' && functionEntity.returnType.returnKindName === 'Context') {
        functionBody += 'return _Context;';
      } else if (rootName === 'inputMethod' && functionEntity.returnType.returnKindName === 'InputMethodSubtype') {
        functionBody += 'return mockInputMethodSubtype().InputMethodSubtype;';
      } else {
        functionBody += getReturnStatement(functionEntity.returnType, sourceFile);
      }
    }
  } else {
    const argSet: Set<string> = new Set<string>();
    let argParamsSet: string = '';
    const returnSet: Set<string> = new Set<string>();
    let isCallBack = false;
    let needOverloaded = false;
    functionArray.forEach(value => {
      returnSet.add(value.returnType.returnKindName);
      value.args.forEach(arg => {
        argSet.add(arg.paramName);
        if (arg.paramName.toLowerCase().includes('callback')) {
          isCallBack = true;
          if (arg.paramTypeString) {
            argParamsSet = arg.paramTypeString;
          }
        }
        if (
          arg.paramTypeString.startsWith("'") && arg.paramTypeString.endsWith("'") ||
          arg.paramTypeString.startsWith('"') && arg.paramTypeString.endsWith('"')
        ) {
          needOverloaded = true;
        }
      });
    });
    if (isCallBack) {
      if (overloadedFunctionArr.includes(functionEntity.functionName) && needOverloaded) {
        functionBody += getOverloadedFunctionCallbackStatement(functionArray, sourceFile, mockApi);
      } else {
        functionBody += getCallbackStatement(mockApi, argParamsSet);
      }
    }
    let isReturnPromise = false;
    let promiseReturnValue = '';
    let otherReturnValue = '';
    returnSet.forEach(value => {
      if (value.includes('Promise<')) {
        isReturnPromise = true;
        promiseReturnValue = value;
      } else {
        if (!otherReturnValue) {
          otherReturnValue = value;
        }
      }
    });
    if (isReturnPromise) {
      if (promiseReturnValue) {
        let returnType = null;
        functionArray.forEach(value => {
          if (value.returnType.returnKindName === promiseReturnValue) {
            returnType = value.returnType;
          }
        });
        functionBody += getReturnData(isCallBack, isReturnPromise, returnType, sourceFile, mockApi);
      } else {
        functionBody += `
            return new Promise((resolve, reject) => {
              resolve('[PC Preview] unknow boolean');
            })
          `;
      }
    } else if (otherReturnValue) {
      let returnType = null;
      functionArray.forEach(value => {
        if (value.returnType.returnKindName === otherReturnValue) {
          returnType = value.returnType;
        }
      });
      functionBody += getReturnData(isCallBack, isReturnPromise, returnType, sourceFile, mockApi);
    }
  }
  functionBody += isRoot ? '};' : '},';
  if (isRoot) {
    functionBody += `
      if (!global.${functionEntity.functionName}) {
        global.${functionEntity.functionName} = ${functionEntity.functionName};
      }
    `;
  }
  return functionBody;
}