import React, { Component } from "react";
import { findDOMNode } from "react-dom";
import blacklist from "blacklist";

import DatetimePicker from "./Picker.jsx";
import Portal from "./Portal.jsx";

import classes from "./sass";

class Trigger extends Component {
  constructor() {
    super();
    this.state = {
      isOpen: false,
      pos: {}
    };
  }

  componentDidMount() {
    window.addEventListener("click", this.handleDocumentClick, false);

    if (this.props.appendToBody) {
      window.addEventListener("scroll", this.handlePortalPosition, false);
      window.addEventListener("resize", this.handlePortalPosition, false);
    }
  }

  componentWillUnmount() {
    window.removeEventListener("click", this.handleDocumentClick, false);

    if (this.props.appendToBody) {
      window.removeEventListener("scroll", this.handlePortalPosition, false);
      window.removeEventListener("resize", this.handlePortalPosition, false);
    }
  }

  handleDocumentClick = evt => {
    if (!findDOMNode(this).contains(evt.target)) {
      this.togglePicker(false);
    }
  };

  handlePortalPosition = () => {
    if (this.state.isOpen) {
      this.setState({
        pos: this.getPosition()
      });
    }
  };

  handleChange = (moment, currentPanel) => {
    const { closeOnSelectDay, onChange } = this.props;

    if (currentPanel === "day" && closeOnSelectDay) {
      this.setState({
        isOpen: false
      });
    }

    onChange && onChange(moment);
  };

  togglePicker = isOpen => {
    const { disabled } = this.props;

    if (disabled) return;

    this.setState({
      isOpen,
      pos: this.getPosition()
    });
  };

  getPosition = () => {
    const elem = this.refs.trigger;
    const elemBCR = elem.getBoundingClientRect();

    return {
      top: Math.round(elemBCR.top + elemBCR.height),
      left: Math.round(elemBCR.left)
    };
  };

  _renderPortal = () => {
    const { pos, isOpen } = this.state;
    const style = {
      display: isOpen ? "block" : "none",
      position: "fixed",
      top: `${pos.top}px`,
      left: `${pos.left}px`
    };

    return <Portal style={style}>{this._renderPicker(true)}</Portal>;
  };

  _renderPicker = isOpen => {
    const props = blacklist(
      this.props,
      "className",
      "appendToBody",
      "children",
      "onChange"
    );
    const { position } = props;

    return (
      <DatetimePicker
        {...props}
        className={`${classes["datetime-picker-popup"]} ${
          String(position).toLowerCase() === "top"
            ? classes["pos-top"]
            : classes["pos-bottom"]
        }`}
        isOpen={isOpen}
        onChange={this.handleChange}
      />
    );
  };

  render() {
    const { children, appendToBody, className } = this.props;
    const { isOpen } = this.state;

    return (
      <div className={`${classes["datetime-trigger"]} ${className}`}>
        <div onClick={this.togglePicker.bind(this, !isOpen)} ref="trigger">
          {children}
        </div>
        {appendToBody ? this._renderPortal() : this._renderPicker(isOpen)}
      </div>
    );
  }
}

export default Trigger;