import {useEffect, useRef, useState} from 'react';

import {useClient} from '@/context/client.js';
import {useEcs} from '@/context/ecs.js';
import useRect from '@/util/react-hooks/use-rect.js';

import styles from './tiles.module.css';

export default function Tiles({eventsChannel}) {
  const client = useClient();
  const wrapperRef = useRef();
  const imageRef = useRef();
  const imageRect = useRect(imageRef);
  const [selection, setSelection] = useState({x: 0, y: 0, w: 1, h: 1});
  const [moveStart, setMoveStart] = useState();
  const [layer, setLayer] = useState(0);
  const [brush, setBrush] = useState(0);
  const [stamp, setStamp] = useState([]);
  const [ecs] = useEcs();
  useEffect(() => {
    if (!ecs) {
      return false;
    }
    const master = ecs.get(1);
    if (!master) {
      return false;
    }
    const {TileLayers} = master;
    const {area, tileSize} = TileLayers.layer(0);
    function onClick({x, y}) {
      const at = {
        x: Math.floor(x / tileSize.x),
        y: Math.floor(y / tileSize.y),
      };
      if (at.x < 0 || at.y < 0 || at.x >= area.x || at.y >= area.y) {
        return;
      }
      const payload = {
        brush,
        layer,
        stamp: {
          at,
          data: stamp,
        },
      }
      client.send({
        type: 'AdminAction',
        payload: {type: 'paint', value: payload},
      });
    }
    eventsChannel.addListener('click', onClick);
    return () => {
      eventsChannel.removeListener('click', onClick);
    };
  });
  if (!ecs) {
    return false;
  }
  const master = ecs.get(1);
  if (!master) {
    return false;
  }
  const {TileLayers} = master;
  const {sourceJson, tileSize} = TileLayers.layer(0);
  const {w, h} = sourceJson.meta.size;
  const factor = (imageRect?.width ?? 1) / w;
  return (
    <div className={styles.tiles}>
      <form>
        <div className={styles.paintBar}>
          <div className={styles.layer}>
            <label>
              <span>Layer</span>
              <select
                onChange={(event) => {
                  setLayer(event.target.value)
                }}
                value={layer}
              >
                {
                  Object.keys(TileLayers.layers)
                    .map((layer, i) => (
                      <option
                        key={i}
                        value={i}
                      >
                        {i}
                      </option>
                    ))
                }
              </select>
            </label>
          </div>
          <div className={styles.brush}>
            <label>
              <span>Brush</span>
              <select
                onChange={(event) => {
                  setBrush(event.target.value)
                }}
                value={brush}
              >
                <option>Paint</option>
              </select>
            </label>
          </div>
        </div>
      </form>
      {/* eslint-disable-next-line jsx-a11y/no-static-element-interactions */}
      <div
        onMouseDown={(event) => {
          const wrapperRect = wrapperRef.current.getBoundingClientRect();
          const {left, top} = wrapperRect;
          const c = {
            x: event.clientX,
            y: event.clientY + wrapperRef.current.scrollTop,
          };
          if (
            c.x - left >= (w * factor)
            || c.y - top >= (h * factor)
          ) {
            return;
          }
          const x = Math.floor((c.x - left) / (tileSize.x * factor));
          const y = Math.floor((c.y - top) / (tileSize.y * factor));
          setMoveStart({x, y});
          setSelection({x, y, w: 1, h: 1});
        }}
        onMouseMove={(event) => {
          if (!moveStart) {
            return;
          }
          const {x: sx, y: sy} = moveStart;
          const wrapperRect = wrapperRef.current.getBoundingClientRect();
          const {left, top} = wrapperRect;
          const c = {
            x: event.clientX,
            y: event.clientY + wrapperRef.current.scrollTop,
          };
          const x = Math.floor(
            Math.max(0, Math.min((w * factor) - 1, (c.x - left)) / (tileSize.x * factor)),
          );
          const y = Math.floor(
            Math.max(0, Math.min((h * factor) - 1, (c.y - top)) / (tileSize.y * factor)),
          );
          const mx = Math.min(sx, x);
          const my = Math.min(sy, y);
          setSelection({x: mx, y: my, w: Math.abs(sx - x) + 1, h: Math.abs(sy - y) + 1});
        }}
        onMouseUp={() => {
          setMoveStart();
          const stamp = [];
          const {x, y, w: sw, h: sh} = selection;
          const tw = w / tileSize.x;
          for (let iy = 0; iy < sh; ++iy) {
            const row = [];
            for (let ix = 0; ix < sw; ++ix) {
              row.push((y + iy) * tw + x + ix);
            }
            stamp.push(row);
          }
          setStamp(stamp);
        }}
        className={styles.selectionWrapper}
        ref={wrapperRef}
      >
        <div
          className={styles.selection}
          style={{
            top: selection.y * tileSize.y * factor,
            left: selection.x * tileSize.x * factor,
            height: selection.h * tileSize.x * factor,
            width: selection.w * tileSize.y * factor,
          }}
        />
        <img
          alt="tileset"
          ref={imageRef}
          src={TileLayers.layer(0).source.replace('.json', '.png')}
        />
      </div>
    </div>
  );
}