import addEventListener from 'rc-util/lib/Dom/addEventListener';
import raf from 'rc-util/lib/raf';
export function getTargetRect(target) {
  return target !== window ? target.getBoundingClientRect() : {
    top: 0,
    bottom: window.innerHeight
  };
}
export function getFixedTop(placeholderReact, targetRect, offsetTop) {
  if (offsetTop !== undefined && targetRect.top > placeholderReact.top - offsetTop) {
    return offsetTop + targetRect.top;
  }

  return undefined;
}
export function getFixedBottom(placeholderReact, targetRect, offsetBottom) {
  if (offsetBottom !== undefined && targetRect.bottom < placeholderReact.bottom + offsetBottom) {
    var targetBottomOffset = window.innerHeight - targetRect.bottom;
    return offsetBottom + targetBottomOffset;
  }

  return undefined;
} // ======================== Observer ========================

var TRIGGER_EVENTS = ['resize', 'scroll', 'touchstart', 'touchmove', 'touchend', 'pageshow', 'load'];
var observerEntities = [];
export function getObserverEntities() {
  // Only used in test env. Can be removed if refactor.
  return observerEntities;
}
export function addObserveTarget(target, affix) {
  if (!target) return;
  var entity = observerEntities.find(function (item) {
    return item.target === target;
  });

  if (entity) {
    entity.affixList.push(affix);
  } else {
    entity = {
      target: target,
      affixList: [affix],
      eventHandlers: {}
    };
    observerEntities.push(entity); // Add listener

    TRIGGER_EVENTS.forEach(function (eventName) {
      entity.eventHandlers[eventName] = addEventListener(target, eventName, function () {
        entity.affixList.forEach(function (targetAffix) {
          targetAffix.lazyUpdatePosition();
        });
      });
    });
  }
}
export function removeObserveTarget(affix) {
  var observerEntity = observerEntities.find(function (oriObserverEntity) {
    var hasAffix = oriObserverEntity.affixList.some(function (item) {
      return item === affix;
    });

    if (hasAffix) {
      oriObserverEntity.affixList = oriObserverEntity.affixList.filter(function (item) {
        return item !== affix;
      });
    }

    return hasAffix;
  });

  if (observerEntity && observerEntity.affixList.length === 0) {
    observerEntities = observerEntities.filter(function (item) {
      return item !== observerEntity;
    }); // Remove listener

    TRIGGER_EVENTS.forEach(function (eventName) {
      var handler = observerEntity.eventHandlers[eventName];

      if (handler && handler.remove) {
        handler.remove();
      }
    });
  }
}
export function throttleByAnimationFrame(fn) {
  var requestId;

  var later = function later(args) {
    return function () {
      requestId = null;
      fn.apply(void 0, args);
    };
  };

  var throttled = function throttled() {
    var args = [];

    for (var _i = 0; _i < arguments.length; _i++) {
      args[_i] = arguments[_i];
    }

    if (requestId == null) {
      requestId = raf(later(args));
    }
  };

  throttled.cancel = function () {
    return raf.cancel(requestId);
  };

  return throttled;
}
export function throttleByAnimationFrameDecorator() {
  // eslint-disable-next-line @typescript-eslint/no-explicit-any
  return function throttle(target, key, descriptor) {
    var fn = descriptor.value;
    var definingProperty = false;
    return {
      configurable: true,
      get: function get() {
        // In IE11 calling Object.defineProperty has a side-effect of evaluating the
        // getter for the property which is being replaced. This causes infinite
        // recursion and an "Out of stack space" error.
        // eslint-disable-next-line no-prototype-builtins
        if (definingProperty || this === target.prototype || this.hasOwnProperty(key)) {
          /* istanbul ignore next */
          return fn;
        }

        var boundFn = throttleByAnimationFrame(fn.bind(this));
        definingProperty = true;
        Object.defineProperty(this, key, {
          value: boundFn,
          configurable: true,
          writable: true
        });
        definingProperty = false;
        return boundFn;
      }
    };
  };
}

