import PropTypes from "prop-types";
import React from 'react';
import {Layer} from "react-konva";
import HoverTile from "../elements/HoverTile";
import {TILE_SIZE_IN_PIXELS} from "../MapConstants";

class HoverLayerComponent extends React.Component {
    static propTypes = {
        mouseX: PropTypes.number.isRequired,
        mouseY: PropTypes.number.isRequired,
        mapPosition: PropTypes.object.isRequired,
        mapScale: PropTypes.number.isRequired,
        isEnabled: PropTypes.func.isRequired,
        onClick: PropTypes.func.isRequired,
    };

    state = {
        positionX: -1,
        positionY: -1,
        validity: false,
    };

    componentDidUpdate() {
        if (!this.props.isEnabled()) {
            return;
        }

        const positionX = Math.floor((this.props.mouseX - this.props.mapPosition.x) / (this.props.mapScale * TILE_SIZE_IN_PIXELS));
        const positionY = Math.floor((this.props.mouseY - this.props.mapPosition.y) / (this.props.mapScale * TILE_SIZE_IN_PIXELS));

        if (positionX !== this.state.positionX || positionY !== this.state.positionY) {
            this.setState({positionX, positionY, validity: this.props.isValid(positionX, positionY)});
        }
    }

    render() {
        if (!this.props.isEnabled()) {
            return <Layer/>;
        }

        const pixelX = this.props.mapScale * this.state.positionX * TILE_SIZE_IN_PIXELS + this.props.mapPosition.x;
        const pixelY = this.props.mapScale * this.state.positionY * TILE_SIZE_IN_PIXELS + this.props.mapPosition.y;

        return (
            <Layer opacity={0.6}>
                <HoverTile
                    pixelX={pixelX}
                    pixelY={pixelY}
                    scale={this.props.mapScale}
                    isValid={this.state.validity}
                    onClick={() => this.state.validity ?
                        this.props.onClick(this.state.positionX, this.state.positionY) : undefined}
                />
                {this.props.children ?
                    React.cloneElement(this.props.children, {pixelX, pixelY, scale: this.props.mapScale}) :
                    undefined
                }
            </Layer>
        );
    }
}

export default HoverLayerComponent;