import { mergeObjects } from "../../../utils/esm/mergeObjects.js";
const EMPTY_PROPS = {};
function mergeProps(a, b, c, d, e) {
  let merged = {
    ...resolvePropsGetter(a, EMPTY_PROPS)
  };
  if (b) {
    merged = mergeOne(merged, b);
  }
  if (c) {
    merged = mergeOne(merged, c);
  }
  if (d) {
    merged = mergeOne(merged, d);
  }
  if (e) {
    merged = mergeOne(merged, e);
  }
  return merged;
}
function mergePropsN(props) {
  if (props.length === 0) {
    return EMPTY_PROPS;
  }
  if (props.length === 1) {
    return resolvePropsGetter(props[0], EMPTY_PROPS);
  }
  let merged = {
    ...resolvePropsGetter(props[0], EMPTY_PROPS)
  };
  for (let i = 1; i < props.length; i += 1) {
    merged = mergeOne(merged, props[i]);
  }
  return merged;
}
function mergeOne(merged, inputProps) {
  if (isPropsGetter(inputProps)) {
    return inputProps(merged);
  }
  return mutablyMergeInto(merged, inputProps);
}
function mutablyMergeInto(mergedProps, externalProps) {
  if (!externalProps) {
    return mergedProps;
  }
  for (const propName in externalProps) {
    const externalPropValue = externalProps[propName];
    switch (propName) {
      case "style": {
        mergedProps[propName] = mergeObjects(mergedProps.style, externalPropValue);
        break;
      }
      case "className": {
        mergedProps[propName] = mergeClassNames(mergedProps.className, externalPropValue);
        break;
      }
      default: {
        if (isEventHandler(propName, externalPropValue)) {
          mergedProps[propName] = mergeEventHandlers(mergedProps[propName], externalPropValue);
        } else {
          mergedProps[propName] = externalPropValue;
        }
      }
    }
  }
  return mergedProps;
}
function isEventHandler(key, value) {
  const code0 = key.charCodeAt(0);
  const code1 = key.charCodeAt(1);
  const code2 = key.charCodeAt(2);
  return code0 === 111 && code1 === 110 && code2 >= 65 && code2 <= 90 && (typeof value === "function" || typeof value === "undefined");
}
function isPropsGetter(inputProps) {
  return typeof inputProps === "function";
}
function resolvePropsGetter(inputProps, previousProps) {
  if (isPropsGetter(inputProps)) {
    return inputProps(previousProps);
  }
  return inputProps ?? EMPTY_PROPS;
}
function mergeEventHandlers(ourHandler, theirHandler) {
  if (!theirHandler) {
    return ourHandler;
  }
  if (!ourHandler) {
    return theirHandler;
  }
  return (event) => {
    if (isSyntheticEvent(event)) {
      const baseUIEvent = event;
      makeEventPreventable(baseUIEvent);
      const result2 = theirHandler(baseUIEvent);
      if (!baseUIEvent.baseUIHandlerPrevented) {
        ourHandler?.(baseUIEvent);
      }
      return result2;
    }
    const result = theirHandler(event);
    ourHandler?.(event);
    return result;
  };
}
function makeEventPreventable(event) {
  event.preventBaseUIHandler = () => {
    event.baseUIHandlerPrevented = true;
  };
  return event;
}
function mergeClassNames(ourClassName, theirClassName) {
  if (theirClassName) {
    if (ourClassName) {
      return theirClassName + " " + ourClassName;
    }
    return theirClassName;
  }
  return ourClassName;
}
function isSyntheticEvent(event) {
  return event != null && typeof event === "object" && "nativeEvent" in event;
}
export {
  makeEventPreventable,
  mergeClassNames,
  mergeProps,
  mergePropsN
};
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