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

export default class Player {

    constructor(dom, dark) {
        this.darkModel = dark;
        // init
        this.app = generatePixiApp(dark);
        dom.appendChild(this.app.view);

        globalThis.__PIXI_APP__ = this.app;

        this.mapContainer = generatePixiContainer('mapContainer');
        this.app.stage.addChild(this.mapContainer);
        this.app.view.addEventListener('contextmenu', (event) => {
            event.preventDefault();
        });

        this.scale = 1; // 缩放
        this.pan = false; // 平移

        // func
        this.app.view.addEventListener('mousedown', (event) => {
            // 右键
            if (event.button === 2) {
                this.mapPan(event);
            }
        })
        this.activateMapScale();
        this.showCoordinates();
        this.appTicker();
    }

    activateMapScale = () => {
        this.app.view.addEventListener('wheel', (event) => {
            event.preventDefault();
            const delta = Math.sign(event.deltaY);

            if (delta === 1) {
                this.scale *= 0.9;
            } else if (delta === -1) {
                this.scale *= 1.1;
            }
            this.mapContainer.scale.set(this.scale);
            this.mapContainer.children.forEach(child => {
                // child.scale.set(1 / this.scale); // 防止图标变小
            })
        });
    }

    mapPan = (event) => {
        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;
        });
    }

    showCoordinates = () => {
        const coordinatesText = new PIXI.Text('{ x: 0, y: 0 }', {
            fill: 0x000000,
            fontSize: 13,
            fontFamily: 'MicrosoftYaHei',
            fontWeight: 'bold',
        });
        coordinatesText.name = 'xyStr'
        coordinatesText.position.set(10, 10);
        this.app.stage.addChild(coordinatesText);

        const mouseMoveInfoTextHandler = (event) => {
            const mouseX = (event.clientX - this.mapContainer.position.x) / this.scale;
            const mouseY = (event.clientY - this.mapContainer.position.y) / this.scale;
            coordinatesText.text = `{ x: ${mouseX.toFixed(2)}, y: ${mouseY.toFixed(2)} }`;
        };
        this.app.view.addEventListener('mousemove', mouseMoveInfoTextHandler);
    }

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

        const inte = 30;
        const lineDefaultAlpha = .5;;
        const lineDefaultColor = 0x000000;
        for (let i = 0; i < this.app.view.width / inte; i++) {
            const graphics = new PIXI.Graphics();
            graphics.lineStyle(.3, lineDefaultColor, lineDefaultAlpha);
            graphics.beginFill(lineDefaultColor);
            graphics.moveTo(i * inte, 0);
            graphics.lineTo(i * inte, this.app.view.height);
            graphics.endFill();
            this.gridLineContainer.addChild(graphics);
        }

        for (let i = 0; i < this.app.view.height / inte; i++) {
            const graphics = new PIXI.Graphics();
            graphics.lineStyle(.3, lineDefaultColor, lineDefaultAlpha);
            graphics.beginFill(lineDefaultColor);
            graphics.moveTo(0, i * inte);
            graphics.lineTo(this.app.view.width, i * inte);
            graphics.endFill();

            this.gridLineContainer.addChild(graphics);
        }
    }

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

    appTicker = () => {
        TWEEDLE.Group.shared.update();
    }

}

function generatePixiApp(dark) {
    const app = new PIXI.Application({
        background: dark ? '#f1f2f6' : '#f1f2f6',
        antialias: true,
    })
    app.stage.eventMode = 'static';
    app.stage.hitArea = app.screen;
    return app;
}

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