'use strict';

var _slicedToArray = function () { function sliceIterator(arr, i) { var _arr = []; var _n = true; var _d = false; var _e = undefined; try { for (var _i = arr[Symbol.iterator](), _s; !(_n = (_s = _i.next()).done); _n = true) { _arr.push(_s.value); if (i && _arr.length === i) break; } } catch (err) { _d = true; _e = err; } finally { try { if (!_n && _i["return"]) _i["return"](); } finally { if (_d) throw _e; } } return _arr; } return function (arr, i) { if (Array.isArray(arr)) { return arr; } else if (Symbol.iterator in Object(arr)) { return sliceIterator(arr, i); } else { throw new TypeError("Invalid attempt to destructure non-iterable instance"); } }; }();

var _ExportMap = require('../ExportMap');

var _ExportMap2 = _interopRequireDefault(_ExportMap);

var _docsUrl = require('../docsUrl');

var _docsUrl2 = _interopRequireDefault(_docsUrl);

var _arrayIncludes = require('array-includes');

var _arrayIncludes2 = _interopRequireDefault(_arrayIncludes);

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

/*
Notes on TypeScript namespaces aka TSModuleDeclaration:

There are two forms:
- active namespaces: namespace Foo {} / module Foo {}
- ambient modules; declare module "eslint-plugin-import" {}

active namespaces:
- cannot contain a default export
- cannot contain an export all
- cannot contain a multi name export (export { a, b })
- can have active namespaces nested within them

ambient namespaces:
- can only be defined in .d.ts files
- cannot be nested within active namespaces
- have no other restrictions
*/

const rootProgram = 'root';
const tsTypePrefix = 'type:';

/**
 * Detect function overloads like:
 * ```ts
 * export function foo(a: number);
 * export function foo(a: string);
 * export function foo(a: number|string) { return a; }
 * ```
 * @param {Set<Object>} nodes
 * @returns {boolean}
 */
function isTypescriptFunctionOverloads(nodes) {
  const types = new Set(Array.from(nodes, node => node.parent.type));
  return types.has('TSDeclareFunction') && (types.size === 1 || types.size === 2 && types.has('FunctionDeclaration'));
}

module.exports = {
  meta: {
    type: 'problem',
    docs: {
      url: (0, _docsUrl2.default)('export')
    },
    schema: []
  },

  create: function (context) {
    const namespace = new Map([[rootProgram, new Map()]]);

    function addNamed(name, node, parent, isType) {
      if (!namespace.has(parent)) {
        namespace.set(parent, new Map());
      }
      const named = namespace.get(parent);

      const key = isType ? `${tsTypePrefix}${name}` : name;
      let nodes = named.get(key);

      if (nodes == null) {
        nodes = new Set();
        named.set(key, nodes);
      }

      nodes.add(node);
    }

    function getParent(node) {
      if (node.parent && node.parent.type === 'TSModuleBlock') {
        return node.parent.parent;
      }

      // just in case somehow a non-ts namespace export declaration isn't directly
      // parented to the root Program node
      return rootProgram;
    }

    return {
      'ExportDefaultDeclaration': node => addNamed('default', node, getParent(node)),

      'ExportSpecifier': node => addNamed(node.exported.name, node.exported, getParent(node)),

      'ExportNamedDeclaration': function (node) {
        if (node.declaration == null) return;

        const parent = getParent(node);
        // support for old TypeScript versions
        const isTypeVariableDecl = node.declaration.kind === 'type';

        if (node.declaration.id != null) {
          if ((0, _arrayIncludes2.default)(['TSTypeAliasDeclaration', 'TSInterfaceDeclaration'], node.declaration.type)) {
            addNamed(node.declaration.id.name, node.declaration.id, parent, true);
          } else {
            addNamed(node.declaration.id.name, node.declaration.id, parent, isTypeVariableDecl);
          }
        }

        if (node.declaration.declarations != null) {
          for (let declaration of node.declaration.declarations) {
            (0, _ExportMap.recursivePatternCapture)(declaration.id, v => addNamed(v.name, v, parent, isTypeVariableDecl));
          }
        }
      },

      'ExportAllDeclaration': function (node) {
        if (node.source == null) return; // not sure if this is ever true

        const remoteExports = _ExportMap2.default.get(node.source.value, context);
        if (remoteExports == null) return;

        if (remoteExports.errors.length) {
          remoteExports.reportErrors(context, node);
          return;
        }

        const parent = getParent(node);

        let any = false;
        remoteExports.forEach((v, name) => name !== 'default' && (any = true) && // poor man's filter
        addNamed(name, node, parent));

        if (!any) {
          context.report(node.source, `No named exports found in module '${node.source.value}'.`);
        }
      },

      'Program:exit': function () {
        for (let _ref of namespace) {
          var _ref2 = _slicedToArray(_ref, 2);

          let named = _ref2[1];

          for (let _ref3 of named) {
            var _ref4 = _slicedToArray(_ref3, 2);

            let name = _ref4[0];
            let nodes = _ref4[1];

            if (nodes.size <= 1) continue;

            if (isTypescriptFunctionOverloads(nodes)) continue;

            for (let node of nodes) {
              if (name === 'default') {
                context.report(node, 'Multiple default exports.');
              } else {
                context.report(node, `Multiple exports of name '${name.replace(tsTypePrefix, '')}'.`);
              }
            }
          }
        }
      }
    };
  }
};
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