// https://github.com/yiminghe/css-animation 1.5.0

import Event from './Event';
import classes from '../component-classes';
import { requestAnimationTimeout, cancelAnimationTimeout } from '../requestAnimationTimeout';

const isCssAnimationSupported = Event.endEvents.length !== 0;
const capitalPrefixes = [
  'Webkit',
  'Moz',
  'O',
  // ms is special .... !
  'ms',
];
const prefixes = ['-webkit-', '-moz-', '-o-', 'ms-', ''];

function getStyleProperty(node, name) {
  // old ff need null, https://developer.mozilla.org/en-US/docs/Web/API/Window/getComputedStyle
  const style = window.getComputedStyle(node, null);
  let ret = '';
  for (let i = 0; i < prefixes.length; i++) {
    ret = style.getPropertyValue(prefixes[i] + name);
    if (ret) {
      break;
    }
  }
  return ret;
}

function fixBrowserByTimeout(node) {
  if (isCssAnimationSupported) {
    const transitionDelay = parseFloat(getStyleProperty(node, 'transition-delay')) || 0;
    const transitionDuration = parseFloat(getStyleProperty(node, 'transition-duration')) || 0;
    const animationDelay = parseFloat(getStyleProperty(node, 'animation-delay')) || 0;
    const animationDuration = parseFloat(getStyleProperty(node, 'animation-duration')) || 0;
    const time = Math.max(transitionDuration + transitionDelay, animationDuration + animationDelay);
    // sometimes, browser bug
    node.rcEndAnimTimeout = setTimeout(() => {
      node.rcEndAnimTimeout = null;
      if (node.rcEndListener) {
        node.rcEndListener();
      }
    }, time * 1000 + 200);
  }
}

function clearBrowserBugTimeout(node) {
  if (node.rcEndAnimTimeout) {
    clearTimeout(node.rcEndAnimTimeout);
    node.rcEndAnimTimeout = null;
  }
}

const cssAnimation = (node, transitionName, endCallback) => {
  const nameIsObj = typeof transitionName === 'object';
  const className = nameIsObj ? transitionName.name : transitionName;
  const activeClassName = nameIsObj ? transitionName.active : `${transitionName}-active`;
  let end = endCallback;
  let start;
  let active;
  const nodeClasses = classes(node);

  if (endCallback && Object.prototype.toString.call(endCallback) === '[object Object]') {
    end = endCallback.end;
    start = endCallback.start;
    active = endCallback.active;
  }

  if (node.rcEndListener) {
    node.rcEndListener();
  }

  node.rcEndListener = e => {
    if (e && e.target !== node) {
      return;
    }

    if (node.rcAnimTimeout) {
      cancelAnimationTimeout(node.rcAnimTimeout);
      node.rcAnimTimeout = null;
    }

    clearBrowserBugTimeout(node);

    nodeClasses.remove(className);
    nodeClasses.remove(activeClassName);

    Event.removeEndEventListener(node, node.rcEndListener);
    node.rcEndListener = null;

    // Usually this optional end is used for informing an owner of
    // a leave animation and telling it to remove the child.
    if (end) {
      end();
    }
  };

  Event.addEndEventListener(node, node.rcEndListener);

  if (start) {
    start();
  }
  nodeClasses.add(className);

  node.rcAnimTimeout = requestAnimationTimeout(() => {
    node.rcAnimTimeout = null;

    nodeClasses.add(className);
    nodeClasses.add(activeClassName);

    if (active) {
      requestAnimationTimeout(active, 0);
    }
    fixBrowserByTimeout(node);
    // 30ms for firefox
  }, 30);

  return {
    stop() {
      if (node.rcEndListener) {
        node.rcEndListener();
      }
    },
  };
};

cssAnimation.style = (node, style, callback) => {
  if (node.rcEndListener) {
    node.rcEndListener();
  }

  node.rcEndListener = e => {
    if (e && e.target !== node) {
      return;
    }

    if (node.rcAnimTimeout) {
      cancelAnimationTimeout(node.rcAnimTimeout);
      node.rcAnimTimeout = null;
    }

    clearBrowserBugTimeout(node);

    Event.removeEndEventListener(node, node.rcEndListener);
    node.rcEndListener = null;

    // Usually this optional callback is used for informing an owner of
    // a leave animation and telling it to remove the child.
    if (callback) {
      callback();
    }
  };

  Event.addEndEventListener(node, node.rcEndListener);

  node.rcAnimTimeout = requestAnimationTimeout(() => {
    for (const s in style) {
      if (style.hasOwnProperty(s)) {
        node.style[s] = style[s];
      }
    }
    node.rcAnimTimeout = null;
    fixBrowserByTimeout(node);
  }, 0);
};

cssAnimation.setTransition = (node, p, value) => {
  let property = p;
  let v = value;
  if (value === undefined) {
    v = property;
    property = '';
  }
  property = property || '';
  capitalPrefixes.forEach(prefix => {
    node.style[`${prefix}Transition${property}`] = v;
  });
};

cssAnimation.isCssAnimationSupported = isCssAnimationSupported;

export { isCssAnimationSupported };

export default cssAnimation;