import * as PIXI from 'pixi.js';
import * as TWEEDLE from 'tweedle.js';

export default class Player {

    constructor(dom, themeMode) {
        this.themeMode = themeMode;

        this.app = generateApp(dom, themeMode);
        dom.appendChild(this.app.view);

        globalThis.__PIXI_APP__ = this.app;

        this.mapContainer = generatePixiContainer('mapContainer');
        this.app.stage.addChild(this.mapContainer);

        this.activateMapScale();
        this.activateMapPan();
        this.startupTicker();

        const bunny = PIXI.Sprite.from('https://pixijs.com/assets/bunny.png');
        bunny.anchor.set(0.5);
        bunny.x = 500;
        bunny.y = 400;
        this.mapContainer.addChild(bunny);
        this.app.ticker.add((delta) => {
            bunny.rotation += 0.1 * delta;
        });

    }

    activateMapScale = () => {
        this.scale = 1;
        this.app.view.addEventListener('wheel', (event) => {
            event.preventDefault();
            if (this.scale !== this.mapContainer.scale.x) {
                this.scale = this.mapContainer.scale.x;
            }

            const delta = Math.sign(event.deltaY);

            const mousePosition = new PIXI.Point();
            this.app.renderer.plugins.interaction.mapPositionToPoint(mousePosition, event.clientX, event.clientY);

            const diffPositionX = mousePosition.x - this.mapContainer.x;
            const diffPositionY = mousePosition.y - this.mapContainer.y;

            const newScale = this.scale * (delta === 1 ? 0.9 : 1.1);
            const scaleFactor = newScale / this.scale;

            this.mapContainer.x = mousePosition.x - diffPositionX * scaleFactor;
            this.mapContainer.y = mousePosition.y - diffPositionY * scaleFactor;

            this.scale = newScale;

            this.mapContainer.scale.set(this.scale);

            this.mapContainer.children.forEach(child => {
                // child.scale.set(1 / this.scale); // 防止图标变小
            });
        });
    }

    activateMapPan = () => {
        const mapPanHandle = (event) => {
            if (event.button === 2) {
                this.pan = true;
                let previousPosition = { x: event.clientX, y: event.clientY };

                const mouseMoveHandler = (event) => {
                    if (this.pan) {
                        const dx = event.clientX - previousPosition.x;
                        const dy = event.clientY - previousPosition.y;
                        this.mapContainer.position.x += dx;
                        this.mapContainer.position.y += dy;

                        previousPosition = { x: event.clientX, y: event.clientY };
                    }
                };
                this.app.view.addEventListener('mousemove', mouseMoveHandler);
                this.app.view.addEventListener('mouseup', () => {
                    this.app.view.removeEventListener('mousemove', mouseMoveHandler);
                    this.pan = false;
                });
            }
        }
        this.app.view.addEventListener('mousedown', mapPanHandle);
    }

    showGridLines = () => {
        this.hideGridLines();
        if (!this.gridLineContainer) {
            this.gridLineContainer = generatePixiContainer('gridLineContainer');
            this.app.stage.addChild(this.gridLineContainer);
        }

        const spacing = 30;
        const lineDefaultAlpha = .1;;
        const lineDefaultColor = 0x000000;
        for (let i = 0; i < this.app.view.width / spacing; i++) {
            const graphics = new PIXI.Graphics();
            graphics.lineStyle(1, lineDefaultColor, lineDefaultAlpha);
            graphics.beginFill(lineDefaultColor);
            graphics.moveTo(i * spacing, 0);
            graphics.lineTo(i * spacing, this.app.view.height);
            graphics.endFill();
            this.gridLineContainer.addChild(graphics);
        }

        for (let i = 0; i < this.app.view.height / spacing; i++) {
            const graphics = new PIXI.Graphics();
            graphics.lineStyle(1, lineDefaultColor, lineDefaultAlpha);
            graphics.beginFill(lineDefaultColor);
            graphics.moveTo(0, i * spacing);
            graphics.lineTo(this.app.view.width, i * spacing);
            graphics.endFill();

            this.gridLineContainer.addChild(graphics);
        }
    }

    hideGridLines = () => {
        if (this.gridLineContainer) {
            this.app.stage.removeChild(this.gridLineContainer);
            this.gridLineContainer = null;
        }
    }


    startupTicker = () => {
        this.app.ticker.add((delta) => {
            TWEEDLE.Group.shared.update();
        });
    }

    resize = (width, height) => {
        this.app.renderer.resize(width, height);
        this.mapContainer.children.forEach((child) => {
            child.x = width / 2;
            child.y = height / 2;
        });
    }

    destroy = () => {
        this.app.destroy(true, { children: true });
    }

}

const generateApp = (dom, themeMode) => {
    const app = new PIXI.Application({
        background: themeMode === 'dark' ? '#2f3542' : '#f1f2f6',
        antialias: true,
        // resizeTo: dom,
    })
    app.stage.eventMode = 'static';
    app.stage.hitArea = app.screen;
    app.view.addEventListener('contextmenu', (event) => {
        event.preventDefault();
    });

    app.view.style.display = 'block';
    app.view.style.margin = '0';
    app.view.style.padding = '0';
    app.view.style.border = 'none';

    return app;
}

const generatePixiContainer = (name) => {
    const mapContainer = new PIXI.Container();
    mapContainer.sortableChildren = true;
    mapContainer.name = name;
    mapContainer.data = {};
    return mapContainer;
}