/**
 * @fileoverview Reports useless `catch` clauses that just rethrow their error.
 * @author Teddy Katz
 */

'use strict';

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

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

    docs: {
      description: 'Disallow unnecessary `catch` clauses',
      recommended: true,
      url: 'https://eslint.org/docs/latest/rules/no-useless-catch',
    },

    schema: [],

    messages: {
      unnecessaryCatchClause: 'Unnecessary catch clause.',
      unnecessaryCatch: 'Unnecessary try/catch wrapper.',
    },
  },

  create(context) {
    return {
      CatchClause(node) {
        if (
          node.param &&
          node.param.type === 'Identifier' &&
          node.body.body.length &&
          node.body.body[0].type === 'ThrowStatement' &&
          node.body.body[0].argument.type === 'Identifier' &&
          node.body.body[0].argument.name === node.param.name
        ) {
          if (node.parent.finalizer) {
            context.report({
              node,
              messageId: 'unnecessaryCatchClause',
            });
          } else {
            context.report({
              node: node.parent,
              messageId: 'unnecessaryCatch',
            });
          }
        }
      },
    };
  },
};