'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");}};}(); /**
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       * @fileOverview Ensures that no imported module imports the linted module.
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       * @author Ben Mosher
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       */

var _resolve = require('eslint-module-utils/resolve');var _resolve2 = _interopRequireDefault(_resolve);
var _ExportMap = require('../ExportMap');var _ExportMap2 = _interopRequireDefault(_ExportMap);
var _importType = require('../core/importType');
var _moduleVisitor = require('eslint-module-utils/moduleVisitor');var _moduleVisitor2 = _interopRequireDefault(_moduleVisitor);
var _docsUrl = require('../docsUrl');var _docsUrl2 = _interopRequireDefault(_docsUrl);function _interopRequireDefault(obj) {return obj && obj.__esModule ? obj : { 'default': obj };}function _toConsumableArray(arr) {if (Array.isArray(arr)) {for (var i = 0, arr2 = Array(arr.length); i < arr.length; i++) {arr2[i] = arr[i];}return arr2;} else {return Array.from(arr);}}

var traversed = new Set();

module.exports = {
  meta: {
    type: 'suggestion',
    docs: {
      category: 'Static analysis',
      description: 'Forbid a module from importing a module with a dependency path back to itself.',
      url: (0, _docsUrl2['default'])('no-cycle') },

    schema: [(0, _moduleVisitor.makeOptionsSchema)({
      maxDepth: {
        anyOf: [
        {
          description: 'maximum dependency depth to traverse',
          type: 'integer',
          minimum: 1 },

        {
          'enum': ['∞'],
          type: 'string' }] },



      ignoreExternal: {
        description: 'ignore external modules',
        type: 'boolean',
        'default': false },

      allowUnsafeDynamicCyclicDependency: {
        description: 'Allow cyclic dependency if there is at least one dynamic import in the chain',
        type: 'boolean',
        'default': false } })] },




  create: function () {function create(context) {
      var myPath = context.getPhysicalFilename ? context.getPhysicalFilename() : context.getFilename();
      if (myPath === '<text>') return {}; // can't cycle-check a non-file

      var options = context.options[0] || {};
      var maxDepth = typeof options.maxDepth === 'number' ? options.maxDepth : Infinity;
      var ignoreModule = function () {function ignoreModule(name) {return options.ignoreExternal && (0, _importType.isExternalModule)(
          name,
          (0, _resolve2['default'])(name, context),
          context);}return ignoreModule;}();


      function checkSourceValue(sourceNode, importer) {
        if (ignoreModule(sourceNode.value)) {
          return; // ignore external modules
        }
        if (options.allowUnsafeDynamicCyclicDependency && (
        // Ignore `import()`
        importer.type === 'ImportExpression' ||
        // `require()` calls are always checked (if possible)
        importer.type === 'CallExpression' && importer.callee.name !== 'require')) {
          return; // cycle via dynamic import allowed by config
        }

        if (
        importer.type === 'ImportDeclaration' && (
        // import type { Foo } (TS and Flow)
        importer.importKind === 'type' ||
        // import { type Foo } (Flow)
        importer.specifiers.every(function (_ref) {var importKind = _ref.importKind;return importKind === 'type';})))

        {
          return; // ignore type imports
        }

        var imported = _ExportMap2['default'].get(sourceNode.value, context);

        if (imported == null) {
          return; // no-unresolved territory
        }

        if (imported.path === myPath) {
          return; // no-self-import territory
        }

        var untraversed = [{ mget: function () {function mget() {return imported;}return mget;}(), route: [] }];
        function detectCycle(_ref2) {var mget = _ref2.mget,route = _ref2.route;
          var m = mget();
          if (m == null) return;
          if (traversed.has(m.path)) return;
          traversed.add(m.path);var _iteratorNormalCompletion = true;var _didIteratorError = false;var _iteratorError = undefined;try {

            for (var _iterator = m.imports[Symbol.iterator](), _step; !(_iteratorNormalCompletion = (_step = _iterator.next()).done); _iteratorNormalCompletion = true) {var _ref3 = _step.value;var _ref4 = _slicedToArray(_ref3, 2);var path = _ref4[0];var _ref4$ = _ref4[1];var getter = _ref4$.getter;var declarations = _ref4$.declarations;
              if (traversed.has(path)) continue;
              var toTraverse = [].concat(_toConsumableArray(declarations)).filter(function (_ref5) {var source = _ref5.source,isOnlyImportingTypes = _ref5.isOnlyImportingTypes;return (
                  !ignoreModule(source.value) &&
                  // Ignore only type imports
                  !isOnlyImportingTypes);});


              /*
                                             If cyclic dependency is allowed via dynamic import, skip checking if any module is imported dynamically
                                             */
              if (options.allowUnsafeDynamicCyclicDependency && toTraverse.some(function (d) {return d.dynamic;})) return;

              /*
                                                                                                                           Only report as a cycle if there are any import declarations that are considered by
                                                                                                                           the rule. For example:
                                                                                                                            a.ts:
                                                                                                                           import { foo } from './b' // should not be reported as a cycle
                                                                                                                            b.ts:
                                                                                                                           import type { Bar } from './a'
                                                                                                                           */


              if (path === myPath && toTraverse.length > 0) return true;
              if (route.length + 1 < maxDepth) {var _iteratorNormalCompletion2 = true;var _didIteratorError2 = false;var _iteratorError2 = undefined;try {
                  for (var _iterator2 = toTraverse[Symbol.iterator](), _step2; !(_iteratorNormalCompletion2 = (_step2 = _iterator2.next()).done); _iteratorNormalCompletion2 = true) {var _ref6 = _step2.value;var source = _ref6.source;
                    untraversed.push({ mget: getter, route: route.concat(source) });
                  }} catch (err) {_didIteratorError2 = true;_iteratorError2 = err;} finally {try {if (!_iteratorNormalCompletion2 && _iterator2['return']) {_iterator2['return']();}} finally {if (_didIteratorError2) {throw _iteratorError2;}}}
              }
            }} catch (err) {_didIteratorError = true;_iteratorError = err;} finally {try {if (!_iteratorNormalCompletion && _iterator['return']) {_iterator['return']();}} finally {if (_didIteratorError) {throw _iteratorError;}}}
        }

        while (untraversed.length > 0) {
          var next = untraversed.shift(); // bfs!
          if (detectCycle(next)) {
            var message = next.route.length > 0 ? 'Dependency cycle via ' + String(
            routeString(next.route)) :
            'Dependency cycle detected.';
            context.report(importer, message);
            return;
          }
        }
      }

      return Object.assign((0, _moduleVisitor2['default'])(checkSourceValue, context.options[0]), {
        'Program:exit': function () {function ProgramExit() {
            traversed.clear();
          }return ProgramExit;}() });

    }return create;}() };


function routeString(route) {
  return route.map(function (s) {return String(s.value) + ':' + String(s.loc.start.line);}).join('=>');
}
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