import isObject from "./isObject.js";
import now from "./now.js";
import toNumber from "./toNumber.js";
var FUNC_ERROR_TEXT = "Expected a function";
var nativeMax = Math.max, nativeMin = Math.min;
function debounce(func, wait, options) {
  var lastArgs, lastThis, maxWait, result, timerId, lastCallTime, lastInvokeTime = 0, leading = false, maxing = false, trailing = true;
  if (typeof func != "function") {
    throw new TypeError(FUNC_ERROR_TEXT);
  }
  wait = toNumber(wait) || 0;
  if (isObject(options)) {
    leading = !!options.leading;
    maxing = "maxWait" in options;
    maxWait = maxing ? nativeMax(toNumber(options.maxWait) || 0, wait) : maxWait;
    trailing = "trailing" in options ? !!options.trailing : trailing;
  }
  function invokeFunc(time) {
    var args = lastArgs, thisArg = lastThis;
    lastArgs = lastThis = void 0;
    lastInvokeTime = time;
    result = func.apply(thisArg, args);
    return result;
  }
  function leadingEdge(time) {
    lastInvokeTime = time;
    timerId = setTimeout(timerExpired, wait);
    return leading ? invokeFunc(time) : result;
  }
  function remainingWait(time) {
    var timeSinceLastCall = time - lastCallTime, timeSinceLastInvoke = time - lastInvokeTime, timeWaiting = wait - timeSinceLastCall;
    return maxing ? nativeMin(timeWaiting, maxWait - timeSinceLastInvoke) : timeWaiting;
  }
  function shouldInvoke(time) {
    var timeSinceLastCall = time - lastCallTime, timeSinceLastInvoke = time - lastInvokeTime;
    return lastCallTime === void 0 || timeSinceLastCall >= wait || timeSinceLastCall < 0 || maxing && timeSinceLastInvoke >= maxWait;
  }
  function timerExpired() {
    var time = now();
    if (shouldInvoke(time)) {
      return trailingEdge(time);
    }
    timerId = setTimeout(timerExpired, remainingWait(time));
  }
  function trailingEdge(time) {
    timerId = void 0;
    if (trailing && lastArgs) {
      return invokeFunc(time);
    }
    lastArgs = lastThis = void 0;
    return result;
  }
  function cancel() {
    if (timerId !== void 0) {
      clearTimeout(timerId);
    }
    lastInvokeTime = 0;
    lastArgs = lastCallTime = lastThis = timerId = void 0;
  }
  function flush() {
    return timerId === void 0 ? result : trailingEdge(now());
  }
  function debounced() {
    var time = now(), isInvoking = shouldInvoke(time);
    lastArgs = arguments;
    lastThis = this;
    lastCallTime = time;
    if (isInvoking) {
      if (timerId === void 0) {
        return leadingEdge(lastCallTime);
      }
      if (maxing) {
        clearTimeout(timerId);
        timerId = setTimeout(timerExpired, wait);
        return invokeFunc(lastCallTime);
      }
    }
    if (timerId === void 0) {
      timerId = setTimeout(timerExpired, wait);
    }
    return result;
  }
  debounced.cancel = cancel;
  debounced.flush = flush;
  return debounced;
}
export {
  debounce as default
};
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