import React from "react";
import Modal from "react-modal";
import "semantic-ui-css/semantic.min.css";
import { Grid, Menu, Segment, Button } from "semantic-ui-react";
import Filters from "./Actions/Filters";
import Banner from "./Actions/Banner";
import Adjustments from "./Actions/Adjustments";
import ReactCrop from "react-image-crop";
import "react-image-crop/dist/ReactCrop.css";
import "./Editor.css";

const customStyles = {
  content: {
    top: "10%",
    left: "10%",
    right: "auto",
    bottom: "auto",
    width: "80%",
    height: "80%",
  },
};

// Make sure to bind modal to your appElement (http://reactcommunity.org/react-modal/accessibility/)
Modal.setAppElement("body");

// const menuItems = ["Filter", "Adjustments", "Crop", "Mask", "Banner"];
const menuItems = ["Filter", "Adjustments"];

const getFilters = (activeItem, canvasId, imgURL, setActivePreset) => {
  switch (activeItem) {
    case "Filter":
      return (
        <Filters
          canvasId={canvasId}
          image={imgURL}
          setActivePreset={setActivePreset}
        />
      );
    case "Banner":
    case "Mask":
      return (
        <Banner
          canvasId={canvasId}
          image={imgURL}
          setActivePreset={setActivePreset}
        />
      );
    case "Adjustments":
      return (
        <Adjustments
          canvasId={canvasId}
          image={imgURL}
          setActivePreset={setActivePreset}
        />
      );
    default:
      return null;
  }
};

function download(canvas, filename) {
  var e;
  var lnk = document.createElement("a");

  lnk.download = filename;
  lnk.href = canvas.toDataURL("image/jpeg", 0.8);

  if (document.createEvent) {
    e = document.createEvent("MouseEvents");
    e.initMouseEvent(
      "click",
      true,
      true,
      window,
      0,
      0,
      0,
      0,
      0,
      false,
      false,
      false,
      false,
      0,
      null
    );
    lnk.dispatchEvent(e);
  } else if (lnk.fireEvent) {
    lnk.fireEvent("onclick");
  }
}

const saveImage = (canvas, image) => {
  const fileName = image.name;
  var fileExtension = fileName.slice(-4);
  if (fileExtension === ".jpg" || fileExtension === ".png") {
    var actualName = fileName.substring(0, fileName.length - 4);
  }
  download(canvas, actualName + "-edited.jpg");
};

const getImageDimensionsRelativeToCanvas = (canvas, img) => {
  const hRatio = canvas.width / img.width;
  const vRatio = canvas.height / img.height;
  const ratio = Math.min(hRatio, vRatio);
  const centerShift_x = (canvas.width - img.width * ratio) / 2;
  const centerShift_y = (canvas.height - img.height * ratio) / 2;

  return {
    width: img.width * ratio,
    height: img.height * ratio,
  };
};

export const Editor = (props) => {
  const { isOpen, image } = props;
  const [activeItem, setActiveItem] = React.useState(menuItems[0]);
  const [mainCanvas, setMainCanvas] = React.useState();
  const [crop, setCrop] = React.useState({});
  const [loadedImage, setLoadedImage] = React.useState();
  const mainCanvasId = "mainCanvas";
  const imgURL = image ? URL.createObjectURL(image) : "";

  const revertCanvasChanges = (canvasId) => {
    global.Caman(`#${canvasId}`, imgURL, function () {
      this.revert();
      this.render();
    });
  };

  const getMainCanvas = () => document.getElementById(mainCanvasId);

  const canvasRef = React.useCallback((node) => {
    setMainCanvas(node);
  }, []);

  const handleItemClick = (e, { name }) => setActiveItem(name);

  React.useEffect(() => {
    if (isOpen && image && mainCanvas) {
      const reader = new FileReader();
      const canvas = getMainCanvas();
      if (canvas) {
        const ctx = canvas.getContext("2d");

        const file = image;
        if (file) {
          reader.readAsDataURL(file);
        }
        reader.addEventListener(
          "load",
          function () {
            const img = new Image();
            img.src = reader.result;
            img.onload = function () {
              const hRatio = canvas.width / img.width;
              const vRatio = canvas.height / img.height;
              const ratio = Math.min(hRatio, vRatio);
              const centerShift_x = (canvas.width - img.width * ratio) / 2;
              const centerShift_y = (canvas.height - img.height * ratio) / 2;
              ctx.clearRect(0, 0, canvas.width, canvas.height);
              ctx.drawImage(
                img,
                0,
                0,
                img.width,
                img.height,
                centerShift_x,
                centerShift_y,
                img.width * ratio,
                img.height * ratio
              );
            };
            setLoadedImage(img);
          },
          false
        );
      }
    }
  }, [mainCanvas, isOpen, image]);

  const renderActions = () => {
    return (
      <div>
        <Button onClick={() => revertCanvasChanges(mainCanvasId)}>
          Revert
        </Button>
        <Button onClick={() => saveImage(mainCanvas, image)}>Save</Button>
      </div>
    );
  };

  const setActivePreset = (preset) => {};

  const renderFilters = () => {
    return getFilters(activeItem, mainCanvasId, imgURL, setActivePreset);
  };

  return (
    <div id="editor">
      <Modal
        isOpen={props.isOpen}
        onAfterOpen={props.afterOpenModal}
        onRequestClose={props.onClose}
        style={customStyles}
        contentLabel="Example Modal"
      >
        <Grid className="main-container">
          <Grid.Column width={4} className="full-height">
            <Menu fluid vertical tabular className="left-menu">
              {menuItems.map((item, index) => {
                return (
                  <Menu.Item
                    key={index}
                    name={item}
                    active={activeItem === item}
                    onClick={handleItemClick}
                  />
                );
              })}
            </Menu>
          </Grid.Column>
          <Grid.Column stretched width={12} className="full-height">
            <Grid className="full-height">
              <Grid.Column width={10}>
                <Segment className="canvas-container">
                  {activeItem === "Crop" ? (
                    <ReactCrop
                      src={imgURL}
                      crop={crop}
                      ruleOfThirds={true}
                      height={300}
                      width={300}
                      onChange={(newCrop) => setCrop(newCrop)}
                    />
                  ) : (
                    <canvas
                      height={600}
                      width={655}
                      ref={canvasRef}
                      id={mainCanvasId}
                    ></canvas>
                  )}
                </Segment>
                {renderActions()}
              </Grid.Column>
              <Grid.Column width={6} className="full-height">
                {renderFilters()}
              </Grid.Column>
            </Grid>
          </Grid.Column>
        </Grid>
      </Modal>
    </div>
  );
};

export default Editor;