// This file contains methods responsible for maintaining a TraversalContext.

"use strict";

var _getIterator = require("babel-runtime/core-js/get-iterator")["default"];

var _interopRequireDefault = require("babel-runtime/helpers/interop-require-default")["default"];

exports.__esModule = true;
exports.call = call;
exports._call = _call;
exports.isBlacklisted = isBlacklisted;
exports.visit = visit;
exports.skip = skip;
exports.skipKey = skipKey;
exports.stop = stop;
exports.setScope = setScope;
exports.setContext = setContext;
exports.resync = resync;
exports._resyncParent = _resyncParent;
exports._resyncKey = _resyncKey;
exports._resyncList = _resyncList;
exports._resyncRemoved = _resyncRemoved;
exports.popContext = popContext;
exports.pushContext = pushContext;
exports.setup = setup;
exports.setKey = setKey;
exports.requeue = requeue;

var _index = require("../index");

var _index2 = _interopRequireDefault(_index);

function call(key) /*: boolean*/ {
  var opts = this.opts;

  this.debug(function () {
    return key;
  });

  if (this.node) {
    if (this._call(opts[key])) return true;
  }

  if (this.node) {
    return this._call(opts[this.node.type] && opts[this.node.type][key]);
  }

  return false;
}

function _call(fns /*:: ?: Array<Function>*/) /*: boolean*/ {
  if (!fns) return false;

  for (var _iterator = fns, _isArray = Array.isArray(_iterator), _i = 0, _iterator = _isArray ? _iterator : _getIterator(_iterator);;) {
    var _ref;

    if (_isArray) {
      if (_i >= _iterator.length) break;
      _ref = _iterator[_i++];
    } else {
      _i = _iterator.next();
      if (_i.done) break;
      _ref = _i.value;
    }

    var fn = _ref;

    if (!fn) continue;

    var node = this.node;
    if (!node) return true;

    var ret = fn.call(this.state, this, this.state);
    if (ret) throw new Error("Unexpected return value from visitor method " + fn);

    // node has been replaced, it will have been requeued
    if (this.node !== node) return true;

    if (this.shouldStop || this.shouldSkip || this.removed) return true;
  }

  return false;
}

function isBlacklisted() /*: boolean*/ {
  var blacklist = this.opts.blacklist;
  return blacklist && blacklist.indexOf(this.node.type) > -1;
}

function visit() /*: boolean*/ {
  if (!this.node) {
    return false;
  }

  if (this.isBlacklisted()) {
    return false;
  }

  if (this.opts.shouldSkip && this.opts.shouldSkip(this)) {
    return false;
  }

  if (this.call("enter") || this.shouldSkip) {
    this.debug(function () {
      return "Skip...";
    });
    return this.shouldStop;
  }

  this.debug(function () {
    return "Recursing into...";
  });
  _index2["default"].node(this.node, this.opts, this.scope, this.state, this, this.skipKeys);

  this.call("exit");

  return this.shouldStop;
}

function skip() {
  this.shouldSkip = true;
}

function skipKey(key) {
  this.skipKeys[key] = true;
}

function stop() {
  this.shouldStop = true;
  this.shouldSkip = true;
}

function setScope() {
  if (this.opts && this.opts.noScope) return;

  var target = this.context && this.context.scope;

  if (!target) {
    var path = this.parentPath;
    while (path && !target) {
      if (path.opts && path.opts.noScope) return;

      target = path.scope;
      path = path.parentPath;
    }
  }

  this.scope = this.getScope(target);
  if (this.scope) this.scope.init();
}

function setContext(context) {
  this.shouldSkip = false;
  this.shouldStop = false;
  this.removed = false;
  this.skipKeys = {};

  if (context) {
    this.context = context;
    this.state = context.state;
    this.opts = context.opts;
  }

  this.setScope();

  return this;
}

/**
 * Here we resync the node paths `key` and `container`. If they've changed according
 * to what we have stored internally then we attempt to resync by crawling and looking
 * for the new values.
 */

function resync() {
  if (this.removed) return;

  this._resyncParent();
  this._resyncList();
  this._resyncKey();
  //this._resyncRemoved();
}

function _resyncParent() {
  if (this.parentPath) {
    this.parent = this.parentPath.node;
  }
}

function _resyncKey() {
  if (!this.container) return;

  if (this.node === this.container[this.key]) return;

  // grrr, path key is out of sync. this is likely due to a modification to the AST
  // not done through our path APIs

  if (Array.isArray(this.container)) {
    for (var i = 0; i < this.container.length; i++) {
      if (this.container[i] === this.node) {
        return this.setKey(i);
      }
    }
  } else {
    for (var key in this.container) {
      if (this.container[key] === this.node) {
        return this.setKey(key);
      }
    }
  }

  // ¯\_(ツ)_/¯ who knows where it's gone lol
  this.key = null;
}

function _resyncList() {
  if (!this.parent || !this.inList) return;

  var newContainer = this.parent[this.listKey];
  if (this.container === newContainer) return;

  // container is out of sync. this is likely the result of it being reassigned
  this.container = newContainer || null;
}

function _resyncRemoved() {
  if (this.key == null || !this.container || this.container[this.key] !== this.node) {
    this._markRemoved();
  }
}

function popContext() {
  this.contexts.pop();
  this.setContext(this.contexts[this.contexts.length - 1]);
}

function pushContext(context) {
  this.contexts.push(context);
  this.setContext(context);
}

function setup(parentPath, container, listKey, key) {
  this.inList = !!listKey;
  this.listKey = listKey;
  this.parentKey = listKey || key;
  this.container = container;

  this.parentPath = parentPath || this.parentPath;
  this.setKey(key);
}

function setKey(key) {
  this.key = key;
  this.node = this.container[this.key];
  this.type = this.node && this.node.type;
}

function requeue() {
  var path = arguments.length <= 0 || arguments[0] === undefined ? this : arguments[0];

  if (path.removed) return;

  for (var _iterator2 = this.contexts, _isArray2 = Array.isArray(_iterator2), _i2 = 0, _iterator2 = _isArray2 ? _iterator2 : _getIterator(_iterator2);;) {
    var _ref2;

    if (_isArray2) {
      if (_i2 >= _iterator2.length) break;
      _ref2 = _iterator2[_i2++];
    } else {
      _i2 = _iterator2.next();
      if (_i2.done) break;
      _ref2 = _i2.value;
    }

    var context = _ref2;

    context.maybeQueue(path);
  }
}