import getCompositeRect from "./dom-utils/getCompositeRect.js";
import getLayoutRect from "./dom-utils/getLayoutRect.js";
import listScrollParents from "./dom-utils/listScrollParents.js";
import getOffsetParent from "./dom-utils/getOffsetParent.js";
import orderModifiers from "./utils/orderModifiers.js";
import debounce from "./utils/debounce.js";
import mergeByName from "./utils/mergeByName.js";
import { isElement } from "./dom-utils/instanceOf.js";
var DEFAULT_OPTIONS = {
  placement: "bottom",
  modifiers: [],
  strategy: "absolute"
};
function areValidElements() {
  for (var _len = arguments.length, args = new Array(_len), _key = 0; _key < _len; _key++) {
    args[_key] = arguments[_key];
  }
  return !args.some(function(element) {
    return !(element && typeof element.getBoundingClientRect === "function");
  });
}
function popperGenerator(generatorOptions) {
  if (generatorOptions === void 0) {
    generatorOptions = {};
  }
  var _generatorOptions = generatorOptions, _generatorOptions$def = _generatorOptions.defaultModifiers, defaultModifiers = _generatorOptions$def === void 0 ? [] : _generatorOptions$def, _generatorOptions$def2 = _generatorOptions.defaultOptions, defaultOptions = _generatorOptions$def2 === void 0 ? DEFAULT_OPTIONS : _generatorOptions$def2;
  return function createPopper(reference, popper, options) {
    if (options === void 0) {
      options = defaultOptions;
    }
    var state = {
      placement: "bottom",
      orderedModifiers: [],
      options: Object.assign({}, DEFAULT_OPTIONS, defaultOptions),
      modifiersData: {},
      elements: {
        reference,
        popper
      },
      attributes: {},
      styles: {}
    };
    var effectCleanupFns = [];
    var isDestroyed = false;
    var instance = {
      state,
      setOptions: function setOptions(setOptionsAction) {
        var options2 = typeof setOptionsAction === "function" ? setOptionsAction(state.options) : setOptionsAction;
        cleanupModifierEffects();
        state.options = Object.assign({}, defaultOptions, state.options, options2);
        state.scrollParents = {
          reference: isElement(reference) ? listScrollParents(reference) : reference.contextElement ? listScrollParents(reference.contextElement) : [],
          popper: listScrollParents(popper)
        };
        var orderedModifiers = orderModifiers(mergeByName([].concat(defaultModifiers, state.options.modifiers)));
        state.orderedModifiers = orderedModifiers.filter(function(m) {
          return m.enabled;
        });
        runModifierEffects();
        return instance.update();
      },
      // Sync update – it will always be executed, even if not necessary. This
      // is useful for low frequency updates where sync behavior simplifies the
      // logic.
      // For high frequency updates (e.g. `resize` and `scroll` events), always
      // prefer the async Popper#update method
      forceUpdate: function forceUpdate() {
        if (isDestroyed) {
          return;
        }
        var _state$elements = state.elements, reference2 = _state$elements.reference, popper2 = _state$elements.popper;
        if (!areValidElements(reference2, popper2)) {
          return;
        }
        state.rects = {
          reference: getCompositeRect(reference2, getOffsetParent(popper2), state.options.strategy === "fixed"),
          popper: getLayoutRect(popper2)
        };
        state.reset = false;
        state.placement = state.options.placement;
        state.orderedModifiers.forEach(function(modifier) {
          return state.modifiersData[modifier.name] = Object.assign({}, modifier.data);
        });
        for (var index = 0; index < state.orderedModifiers.length; index++) {
          if (state.reset === true) {
            state.reset = false;
            index = -1;
            continue;
          }
          var _state$orderedModifie = state.orderedModifiers[index], fn = _state$orderedModifie.fn, _state$orderedModifie2 = _state$orderedModifie.options, _options = _state$orderedModifie2 === void 0 ? {} : _state$orderedModifie2, name = _state$orderedModifie.name;
          if (typeof fn === "function") {
            state = fn({
              state,
              options: _options,
              name,
              instance
            }) || state;
          }
        }
      },
      // Async and optimistically optimized update – it will not be executed if
      // not necessary (debounced to run at most once-per-tick)
      update: debounce(function() {
        return new Promise(function(resolve) {
          instance.forceUpdate();
          resolve(state);
        });
      }),
      destroy: function destroy() {
        cleanupModifierEffects();
        isDestroyed = true;
      }
    };
    if (!areValidElements(reference, popper)) {
      return instance;
    }
    instance.setOptions(options).then(function(state2) {
      if (!isDestroyed && options.onFirstUpdate) {
        options.onFirstUpdate(state2);
      }
    });
    function runModifierEffects() {
      state.orderedModifiers.forEach(function(_ref) {
        var name = _ref.name, _ref$options = _ref.options, options2 = _ref$options === void 0 ? {} : _ref$options, effect = _ref.effect;
        if (typeof effect === "function") {
          var cleanupFn = effect({
            state,
            name,
            instance,
            options: options2
          });
          var noopFn = function noopFn2() {
          };
          effectCleanupFns.push(cleanupFn || noopFn);
        }
      });
    }
    function cleanupModifierEffects() {
      effectCleanupFns.forEach(function(fn) {
        return fn();
      });
      effectCleanupFns = [];
    }
    return instance;
  };
}
export {
  popperGenerator
};
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