/**
 * @fileoverview The rule should warn against code that tries to compare against -0.
 * @author Aladdin-ADD <hh_2013@foxmail.com>
 */
'use strict';

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

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

    docs: {
      description: 'Disallow comparing against `-0`',
      recommended: true,
      url: 'https://eslint.org/docs/latest/rules/no-compare-neg-zero',
    },

    fixable: null,
    schema: [],

    messages: {
      unexpected:
        "Do not use the '{{operator}}' operator to compare against -0.",
    },
  },

  create(context) {
    //--------------------------------------------------------------------------
    // Helpers
    //--------------------------------------------------------------------------

    /**
     * Checks a given node is -0
     * @param {ASTNode} node A node to check.
     * @returns {boolean} `true` if the node is -0.
     */
    function isNegZero(node) {
      return (
        node.type === 'UnaryExpression' &&
        node.operator === '-' &&
        node.argument.type === 'Literal' &&
        node.argument.value === 0
      );
    }
    const OPERATORS_TO_CHECK = new Set([
      '>',
      '>=',
      '<',
      '<=',
      '==',
      '===',
      '!=',
      '!==',
    ]);

    return {
      BinaryExpression(node) {
        if (OPERATORS_TO_CHECK.has(node.operator)) {
          if (isNegZero(node.left) || isNegZero(node.right)) {
            context.report({
              node,
              messageId: 'unexpected',
              data: { operator: node.operator },
            });
          }
        }
      },
    };
  },
};