import React, { Component } from "react";
import {
  withStyles,
  Typography,
  MobileStepper,
  Button
} from "@material-ui/core";
import { styles } from "./Attachment.styles";
import { Attachment } from "../../types/Attachment";
import SwipeableViews from "react-swipeable-views";

interface IAttachmentProps {
  media: [Attachment];
  classes?: any;
}

interface IAttachmentState {
  totalSteps: number;
  currentStep: number;
  attachments: [Attachment];
}

class AttachmentComponent extends Component<
  IAttachmentProps,
  IAttachmentState
> {
  constructor(props: IAttachmentProps) {
    super(props);

    this.state = {
      attachments: this.props.media,
      totalSteps: this.props.media.length,
      currentStep: 0
    };
  }

  moveBack() {
    let nextStep = this.state.currentStep - 1;
    if (nextStep < 0) {
      nextStep = 0;
    }
    this.setState({ currentStep: nextStep });
  }

  moveForward() {
    let nextStep = this.state.currentStep + 1;
    if (nextStep > this.state.totalSteps) {
      nextStep = this.state.totalSteps;
    }
    this.setState({ currentStep: nextStep });
  }

  handleStepChange(currentStep: number) {
    this.setState({
      currentStep
    });
  }

  getSlide(slide: Attachment) {
    const { classes } = this.props;
    switch (slide.type) {
      case "image":
        return (
          <img
            src={slide.url}
            alt={slide.description ? slide.description : ""}
            className={classes.mediaObject}
          />
        );
      case "video":
        return (
          <video
            controls
            autoPlay={false}
            src={slide.url}
            className={classes.mediaObject}
          />
        );
      case "gifv":
        return (
          <img
            src={slide.url}
            alt={slide.description ? slide.description : ""}
            className={classes.mediaObject}
          />
        );
      case "unknown":
        return <object data={slide.url} className={classes.mediaObject} />;
    }
  }

  render() {
    const { classes } = this.props;
    const step = this.state.currentStep;
    const mediaItem = this.state.attachments[step];
    return (
      <div className={classes.mediaContainer}>
        <SwipeableViews index={this.state.currentStep}>
          {this.state.attachments.map((slide: Attachment) => {
            return (
              <div key={slide.id} className={classes.mediaSlide}>
                {this.getSlide(slide)}
              </div>
            );
          })}
        </SwipeableViews>
        <MobileStepper
          steps={this.state.totalSteps}
          position="static"
          activeStep={this.state.currentStep}
          className={classes.mobileStepper}
          nextButton={
            <Button
              size="small"
              onClick={() => this.moveForward()}
              disabled={this.state.currentStep === this.state.totalSteps - 1}
            >
              Next
            </Button>
          }
          backButton={
            <Button
              size="small"
              onClick={() => this.moveBack()}
              disabled={this.state.currentStep === 0}
            >
              Back
            </Button>
          }
        />
        <Typography variant="caption">
          {mediaItem.description
            ? mediaItem.description
            : "No description provided."}
        </Typography>
      </div>
    );
  }
}

export default withStyles(styles)(AttachmentComponent);