/**
 * @fileoverview Enforce a maximum number of classes per file
 * @author James Garbutt <https://github.com/43081j>
 */
'use strict';

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

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

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

    docs: {
      description: 'Enforce a maximum number of classes per file',
      recommended: false,
      url: 'https://eslint.org/docs/latest/rules/max-classes-per-file',
    },

    schema: [
      {
        oneOf: [
          {
            type: 'integer',
            minimum: 1,
          },
          {
            type: 'object',
            properties: {
              ignoreExpressions: {
                type: 'boolean',
              },
              max: {
                type: 'integer',
                minimum: 1,
              },
            },
            additionalProperties: false,
          },
        ],
      },
    ],

    messages: {
      maximumExceeded:
        'File has too many classes ({{ classCount }}). Maximum allowed is {{ max }}.',
    },
  },
  create(context) {
    const [option = {}] = context.options;
    const [ignoreExpressions, max] =
      typeof option === 'number' ?
        [false, option || 1]
      : [option.ignoreExpressions, option.max || 1];

    let classCount = 0;

    return {
      Program() {
        classCount = 0;
      },
      'Program:exit'(node) {
        if (classCount > max) {
          context.report({
            node,
            messageId: 'maximumExceeded',
            data: {
              classCount,
              max,
            },
          });
        }
      },
      ClassDeclaration() {
        classCount++;
      },
      ClassExpression() {
        if (!ignoreExpressions) {
          classCount++;
        }
      },
    };
  },
};