/**
 * @fileoverview Rule to disallow calls to the `Object` constructor without an argument
 * @author Francesco Trotta
 */

'use strict';

//------------------------------------------------------------------------------
// Requirements
//------------------------------------------------------------------------------

const {
  getVariableByName,
  isArrowToken,
  isStartOfExpressionStatement,
  needsPrecedingSemicolon,
} = require('./utils/ast-utils');

//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------

/** @type {import('../types').Rule.RuleModule} */
module.exports = {
  meta: {
    type: 'suggestion',

    docs: {
      description:
        'Disallow calls to the `Object` constructor without an argument',
      recommended: false,
      url: 'https://eslint.org/docs/latest/rules/no-object-constructor',
    },

    hasSuggestions: true,

    schema: [],

    messages: {
      preferLiteral: 'The object literal notation {} is preferable.',
      useLiteral: "Replace with '{{replacement}}'.",
      useLiteralAfterSemicolon:
        "Replace with '{{replacement}}', add preceding semicolon.",
    },
  },

  create(context) {
    const sourceCode = context.sourceCode;

    /**
     * Determines whether or not an object literal that replaces a specified node needs to be enclosed in parentheses.
     * @param {ASTNode} node The node to be replaced.
     * @returns {boolean} Whether or not parentheses around the object literal are required.
     */
    function needsParentheses(node) {
      if (isStartOfExpressionStatement(node)) {
        return true;
      }

      const prevToken = sourceCode.getTokenBefore(node);

      if (prevToken && isArrowToken(prevToken)) {
        return true;
      }

      return false;
    }

    /**
     * Reports on nodes where the `Object` constructor is called without arguments.
     * @param {ASTNode} node The node to evaluate.
     * @returns {void}
     */
    function check(node) {
      if (
        node.callee.type !== 'Identifier' ||
        node.callee.name !== 'Object' ||
        node.arguments.length
      ) {
        return;
      }

      const variable = getVariableByName(sourceCode.getScope(node), 'Object');

      if (variable && variable.identifiers.length === 0) {
        let replacement;
        let fixText;
        let messageId = 'useLiteral';

        if (needsParentheses(node)) {
          replacement = '({})';
          if (needsPrecedingSemicolon(sourceCode, node)) {
            fixText = ';({})';
            messageId = 'useLiteralAfterSemicolon';
          } else {
            fixText = '({})';
          }
        } else {
          replacement = fixText = '{}';
        }

        context.report({
          node,
          messageId: 'preferLiteral',
          suggest: [
            {
              messageId,
              data: { replacement },
              fix: (fixer) => fixer.replaceText(node, fixText),
            },
          ],
        });
      }
    }

    return {
      CallExpression: check,
      NewExpression: check,
    };
  },
};