// @flow

import React from 'react';
import type { ComponentType, Element, Node } from 'react';
import classNames from 'classnames';
import EventListener from 'react-event-listener';
import withStyles from '../styles/withStyles';
import { duration } from '../styles/transitions';
import ClickAwayListener from '../utils/ClickAwayListener';
import { capitalizeFirstLetter, createChainedFunction } from '../utils/helpers';
import Slide from '../transitions/Slide';
import SnackbarContent from './SnackbarContent';
import type { TransitionDuration, TransitionCallback } from '../internal/transition';

export const styles = (theme: Object) => {
  const gutter = theme.spacing.unit * 3;
  const top = { top: 0 };
  const bottom = { bottom: 0 };
  const right = { justifyContent: 'flex-end' };
  const left = { justifyContent: 'flex-start' };
  const topSpace = { top: gutter };
  const bottomSpace = { bottom: gutter };
  const rightSpace = { right: gutter };
  const leftSpace = { left: gutter };
  const center = {
    left: '50%',
    right: 'auto',
    transform: 'translateX(-50%)',
  };

  return {
    root: {
      zIndex: theme.zIndex.snackbar,
      position: 'fixed',
      display: 'flex',
      left: 0,
      right: 0,
      justifyContent: 'center',
      alignItems: 'center',
    },
    anchorTopCenter: {
      extend: [top],
      [theme.breakpoints.up('md')]: {
        extend: [center],
      },
    },
    anchorBottomCenter: {
      extend: [bottom],
      [theme.breakpoints.up('md')]: {
        extend: [center],
      },
    },
    anchorTopRight: {
      extend: [top, right],
      [theme.breakpoints.up('md')]: {
        left: 'auto',
        extend: [topSpace, rightSpace],
      },
    },
    anchorBottomRight: {
      extend: [bottom, right],
      [theme.breakpoints.up('md')]: {
        left: 'auto',
        extend: [bottomSpace, rightSpace],
      },
    },
    anchorTopLeft: {
      extend: [top, left],
      [theme.breakpoints.up('md')]: {
        right: 'auto',
        extend: [topSpace, leftSpace],
      },
    },
    anchorBottomLeft: {
      extend: [bottom, left],
      [theme.breakpoints.up('md')]: {
        right: 'auto',
        extend: [bottomSpace, leftSpace],
      },
    },
  };
};

export type Origin = {
  horizontal?: 'left' | 'center' | 'right' | number,
  vertical?: 'top' | 'center' | 'bottom' | number,
};

type ProvidedProps = {
  anchorOrigin: Origin,
  classes: Object,
};

export type Props = {
  /**
   * The action to display.
   */
  action?: Node,
  /**
   * The anchor of the `Snackbar`.
   */
  anchorOrigin?: Origin,
  /**
   * The number of milliseconds to wait before automatically dismissing.
   * This behavior is disabled by default with the `null` value.
   */
  autoHideDuration?: ?number,
  /**
   * The number of milliseconds to wait before dismissing after user interaction.
   * If `autoHideDuration` property isn't specified, it does nothing.
   * If `autoHideDuration` property is specified but `resumeHideDuration` isn't,
   * we default to `autoHideDuration / 2` ms.
   */
  resumeHideDuration?: number,
  /**
   * If you wish the take control over the children of the component you can use that property.
   * When using it, no `SnackbarContent` component will be rendered.
   */
  children?: Element<any>,
  /**
   * Useful to extend the style applied to components.
   */
  classes?: Object,
  /**
   * @ignore
   */
  className?: string,
  /**
   * When displaying multiple consecutive Snackbars from a parent rendering a single
   * <Snackbar/>, add the key property to ensure independent treatment of each message.
   * e.g. <Snackbar key={message} />, otherwise, the message may update-in-place and
   * features such as autoHideDuration may be canceled.
   */
  key?: any,
  /**
   * The message to display.
   */
  message?: Node,
  /**
   * Callback fired before the transition is entering.
   */
  onEnter?: TransitionCallback,
  /**
   * Callback fired when the transition is entering.
   */
  onEntering?: TransitionCallback,
  /**
   * Callback fired when the transition has entered.
   */
  onEntered?: TransitionCallback,
  /**
   * Callback fired before the transition is exiting.
   */
  onExit?: TransitionCallback,
  /**
   * Callback fired when the transition is exiting.
   */
  onExiting?: TransitionCallback,
  /**
   * Callback fired when the transition has exited.
   */
  onExited?: TransitionCallback,
  /**
   * @ignore
   */
  onMouseEnter?: Function,
  /**
   * @ignore
   */
  onMouseLeave?: Function,
  /**
   * Callback fired when the component requests to be closed.
   *
   * Typically `onRequestClose` is used to set state in the parent component,
   * which is used to control the `Snackbar` `open` prop.
   *
   * The `reason` parameter can optionally be used to control the response to `onRequestClose`,
   * for example ignoring `clickaway`.
   *
   * @param {object} event The event source of the callback
   * @param {string} reason Can be:`"timeout"` (`autoHideDuration` expired) or: `"clickaway"`
   */
  onRequestClose?: (event: ?Event, reason: string) => void,
  /**
   * If true, `Snackbar` is open.
   */
  open: boolean,
  /**
   * Properties applied to the `SnackbarContent` element.
   */
  SnackbarContentProps?: Object,
  /**
   * Transition component.
   */
  transition?: ComponentType<*>,
  /**
   * The duration for the transition, in milliseconds.
   * You may specify a single timeout for all transitions, or individually with an object.
   */
  transitionDuration?: TransitionDuration,
};

type State = {
  exited: boolean,
};

class Snackbar extends React.Component<ProvidedProps & Props, State> {
  static defaultProps = {
    anchorOrigin: { vertical: 'bottom', horizontal: 'center' },
    transitionDuration: {
      enter: duration.enteringScreen,
      exit: duration.leavingScreen,
    },
  };

  state = {
    // Used to only render active snackbars.
    exited: false,
  };

  componentWillMount() {
    if (!this.props.open) {
      this.setState({ exited: true });
    }
  }

  componentDidMount() {
    if (this.props.open) {
      this.setAutoHideTimer();
    }
  }

  componentWillReceiveProps(nextProps) {
    if (nextProps.open && this.state.exited) {
      this.setState({ exited: false });
    }
  }

  componentDidUpdate(prevProps) {
    if (prevProps.open !== this.props.open) {
      if (this.props.open) {
        this.setAutoHideTimer();
      } else {
        clearTimeout(this.timerAutoHide);
      }
    }
  }

  componentWillUnmount() {
    clearTimeout(this.timerAutoHide);
  }

  // Timer that controls delay before snackbar auto hides
  setAutoHideTimer(autoHideDuration = null) {
    if (!this.props.onRequestClose || this.props.autoHideDuration === undefined) {
      return;
    }

    clearTimeout(this.timerAutoHide);
    this.timerAutoHide = setTimeout(() => {
      if (!this.props.onRequestClose || this.props.autoHideDuration === undefined) {
        return;
      }

      this.props.onRequestClose(null, 'timeout');
    }, autoHideDuration || this.props.autoHideDuration || 0);
  }

  timerAutoHide = null;

  handleMouseEnter = (event: SyntheticUIEvent<>) => {
    if (this.props.onMouseEnter) {
      this.props.onMouseEnter(event);
    }
    this.handlePause();
  };

  handleMouseLeave = (event: SyntheticUIEvent<>) => {
    if (this.props.onMouseLeave) {
      this.props.onMouseLeave(event);
    }
    this.handleResume();
  };

  handleClickAway = (event: Event) => {
    if (this.props.onRequestClose) {
      this.props.onRequestClose(event, 'clickaway');
    }
  };

  // Pause the timer when the user is interacting with the Snackbar
  // or when the user hide the window.
  handlePause = () => {
    clearTimeout(this.timerAutoHide);
  };

  // Restart the timer when the user is no longer interacting with the Snackbar
  // or when the window is shown back.
  handleResume = () => {
    if (this.props.autoHideDuration !== undefined) {
      if (this.props.resumeHideDuration !== undefined) {
        this.setAutoHideTimer(this.props.resumeHideDuration);
        return;
      }
      this.setAutoHideTimer((this.props.autoHideDuration || 0) * 0.5);
    }
  };

  handleTransitionExited = () => {
    this.setState({ exited: true });
  };

  render() {
    const {
      action,
      anchorOrigin: { vertical, horizontal },
      autoHideDuration,
      resumeHideDuration,
      children,
      classes,
      className,
      transitionDuration,
      message,
      onEnter,
      onEntering,
      onEntered,
      onExit,
      onExiting,
      onExited,
      onMouseEnter,
      onMouseLeave,
      onRequestClose,
      open,
      SnackbarContentProps,
      transition: TransitionProp,
      ...other
    } = this.props;

    if (!open && this.state.exited) {
      return null;
    }

    const transitionProps = {
      in: open,
      appear: true,
      timeout: transitionDuration,
      onEnter,
      onEntering,
      onEntered,
      onExit,
      onExiting,
      onExited: createChainedFunction(this.handleTransitionExited, onExited),
    };
    const transitionContent = children || (
      <SnackbarContent message={message} action={action} {...SnackbarContentProps} />
    );

    let transition;
    if (TransitionProp) {
      transition = <TransitionProp {...transitionProps}>{transitionContent}</TransitionProp>;
    } else {
      transition = (
        <Slide direction={vertical === 'top' ? 'down' : 'up'} {...transitionProps}>
          {transitionContent}
        </Slide>
      );
    }

    return (
      <EventListener target="window" onFocus={this.handleResume} onBlur={this.handlePause}>
        <ClickAwayListener onClickAway={this.handleClickAway}>
          <div
            className={classNames(
              classes.root,
              classes[
                `anchor${capitalizeFirstLetter(vertical)}${capitalizeFirstLetter(horizontal)}`
              ],
              className,
            )}
            onMouseEnter={this.handleMouseEnter}
            onMouseLeave={this.handleMouseLeave}
            {...other}
          >
            {transition}
          </div>
        </ClickAwayListener>
      </EventListener>
    );
  }
}

export default withStyles(styles, { flip: false, name: 'MuiSnackbar' })(Snackbar);