'use strict';

var utils = require('../utils.js');
require('eslint-visitor-keys');
require('espree');
require('estraverse');

const PRESERVE_PREFIX_SPACE_BEFORE_GENERIC = /* @__PURE__ */ new Set([
  "TSCallSignatureDeclaration",
  "ArrowFunctionExpression",
  "TSFunctionType",
  "FunctionExpression"
]);
var typeGenericSpacing = utils.createRule({
  name: "type-generic-spacing",
  package: "plus",
  meta: {
    type: "layout",
    docs: {
      description: "Enforces consistent spacing inside TypeScript type generics"
    },
    fixable: "whitespace",
    schema: [],
    messages: {
      genericSpacingMismatch: "Generic spaces mismatch"
    }
  },
  defaultOptions: [],
  create: (context) => {
    const sourceCode = context.sourceCode;
    return {
      TSTypeParameterDeclaration: (node) => {
        if (!PRESERVE_PREFIX_SPACE_BEFORE_GENERIC.has(node.parent.type)) {
          const pre = sourceCode.text.slice(0, node.range[0]);
          const preSpace = pre.match(/(\s+)$/)?.[0];
          if (preSpace && preSpace.length) {
            context.report({
              node,
              messageId: "genericSpacingMismatch",
              *fix(fixer) {
                yield fixer.replaceTextRange([node.range[0] - preSpace.length, node.range[0]], "");
              }
            });
          }
        }
        const params = node.params;
        for (let i = 1; i < params.length; i++) {
          const prev = params[i - 1];
          const current = params[i];
          const from = prev.range[1];
          const to = current.range[0];
          const span = sourceCode.text.slice(from, to);
          if (span !== ", " && !span.match(/,\s*\n/)) {
            context.report({
              *fix(fixer) {
                yield fixer.replaceTextRange([from, to], ", ");
              },
              loc: {
                start: prev.loc.end,
                end: current.loc.start
              },
              messageId: "genericSpacingMismatch",
              node
            });
          }
        }
      },
      // add space around = in type Foo<T = true>
      TSTypeParameter: (node) => {
        if (!node.default)
          return;
        const endNode = node.constraint || node.name;
        const from = endNode.range[1];
        const to = node.default.range[0];
        const span = sourceCode.text.slice(from, to);
        if (!span.match(/(?:^|[^ ]) = (?:$|[^ ])/)) {
          context.report({
            *fix(fixer) {
              yield fixer.replaceTextRange([from, to], span.replace(/\s*=\s*/, " = "));
            },
            loc: {
              start: endNode.loc.end,
              end: node.default.loc.start
            },
            messageId: "genericSpacingMismatch",
            node
          });
        }
      }
    };
  }
});

module.exports = typeGenericSpacing;