import * as PIXI from 'pixi.js';
import * as TWEEDLE from 'tweedle.js';
import * as Utils from './utils'
import star from '/public/img/map/star.png'

export default class Player {

    constructor(dom, dark, didClickSprite) {
        // not dynamic
        this.darkModel = dark;
        this.didClickSprite = didClickSprite;
        // 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.activateMapEvent(null);
        this.activateMapScale();
        this.activateMapPan();
        this.showCoordinates();
        this.appTicker();
    }

    activateMapEvent = (leftEvent, rightEvent) => {
        if (this.mapEvent) {
            this.mapContainer.parent.off('mousedown');
            this.mapEvent = null;
            if (this.selectedSprites && this.selectedSprites.length > 0) {
                this.selectedSprites.forEach(child => {
                    Utils.unMarkSprite(child);
                })
            }
        }
        this.mapEvent = (event) => {
            if (leftEvent && event.button === 0) {
                switch (leftEvent) {
                    case Utils.MapEvent.SELECTION_BOX:
                        this.mapSelect(event);
                        break
                    default:
                        break
                }
            }
            if (rightEvent && event.button === 2) {
                switch (rightEvent) {
                    default:
                        break
                }
            }
        }
        this.mapContainer.parent.on('mousedown', this.mapEvent)
    }

    mapSelect = (event) => {
        let isSelecting = false;
        if (!this.selectionBox) {
            this.selectionBox = new PIXI.Graphics();
            this.app.stage.addChild(this.selectionBox);
        }

        // select start pos
        const startPoint = new PIXI.Point();
        this.app.renderer.events.mapPositionToPoint(startPoint, event.clientX, event.clientY);
        let selectionStart = { x: startPoint.x, y: startPoint.y };

        isSelecting = true;

        const handleMouseMove = (event) => {
            if (isSelecting && !this.didClickSprite) {
                // select end pos
                const endPoint = new PIXI.Point();
                this.app.renderer.events.mapPositionToPoint(endPoint, event.clientX, event.clientY);
                const selectionEnd = { x: endPoint.x, y: endPoint.y }

                const width = Math.abs(selectionEnd.x - selectionStart.x);
                const height = Math.abs(selectionEnd.y - selectionStart.y);

                this.selectionBox.clear();
                this.selectionBox.lineStyle(2, 0xCCCCCC, 1);
                this.selectionBox.beginFill(0xCCCCCC, 0.2);
                this.selectionBox.drawRect(Math.min(selectionStart.x, selectionEnd.x), Math.min(selectionStart.y, selectionEnd.y), width, height);
                this.selectionBox.endFill();
            }
        }

        this.mapContainer.parent.on('mousemove', handleMouseMove);

        this.mapContainer.parent.on('mouseup', (event) => {
            if (isSelecting) {
                // sprite show style which be selected
                if (this.selectedSprites && this.selectedSprites.length > 0) {
                    this.selectedSprites.forEach(child => {
                        Utils.unMarkSprite(child);
                    })
                }
                this.selectedSprites = [];

                this.mapContainer.children.forEach(child => {
                    if (Utils.isSpriteInSelectionBox(child, this.selectionBox)) {
                        this.selectedSprites.push(child);
                        Utils.markSprite(child);
                    }
                })
                isSelecting = false;
                this.selectionBox.clear();

                // sprites batch move
                Utils.spriteListBeMovable(this.selectedSprites, this.scale, () => {
                    this.activateMapEvent(Utils.MapEvent.SELECTION_BOX);
                });

            }

            this.mapContainer.parent.off('mousemove', handleMouseMove);
        });
    }

    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);
    }

    activateMapScale = () => {
        this.scale = 1; // 缩放
        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
            })
        });
    }

    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;
        }
    }

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

        const starTexture = PIXI.Texture.from(star);

        const starAmount = 300;
        let cameraZ = 0;
        const fov = 20;
        const baseSpeed = 0.025;
        let speed = 0;
        let warpSpeed = 1;
        const starStretch = 5;
        const starBaseSize = 0.05;

        const stars = [];

        for (let i = 0; i < starAmount; i++) {
            const star = {
                sprite: new PIXI.Sprite(starTexture),
                z: 0,
                x: 0,
                y: 0,
            };
            star.sprite.anchor.x = 0.5;
            star.sprite.anchor.y = 0.7;
            star.sprite.tint = 0x8395a7; // filter
            randomizeStar(star, true);
            this.starryContainer.addChild(star.sprite);
            stars.push(star);
        }

        this.starryInterval = setInterval(() => {
            warpSpeed = warpSpeed > 0 ? 0 : 1;
        }, 5000);


        this.starryTicker = (delta) => {
            speed += (warpSpeed - speed) / 20;
            cameraZ += delta * 10 * (speed + baseSpeed);
            for (let i = 0; i < starAmount; i++) {
                const star = stars[i];
                if (star.z < cameraZ) randomizeStar(star);

                const z = star.z - cameraZ;
                star.sprite.x = star.x * (fov / z) * this.app.renderer.screen.width + this.app.renderer.screen.width / 2;
                star.sprite.y = star.y * (fov / z) * this.app.renderer.screen.width + this.app.renderer.screen.height / 2;

                const dxCenter = star.sprite.x - this.app.renderer.screen.width / 2;
                const dyCenter = star.sprite.y - this.app.renderer.screen.height / 2;
                const distanceCenter = Math.sqrt(dxCenter * dxCenter + dyCenter * dyCenter);
                const distanceScale = Math.max(0, (2000 - z) / 2000);
                star.sprite.scale.x = distanceScale * starBaseSize;

                star.sprite.scale.y = distanceScale * starBaseSize + distanceScale * speed * starStretch * distanceCenter / this.app.renderer.screen.width;
                star.sprite.rotation = Math.atan2(dyCenter, dxCenter) + Math.PI / 2;
            }
        }

        this.app.ticker.add(this.starryTicker);

        function randomizeStar(star, initial) {
            star.z = initial ? Math.random() * 2000 : cameraZ + Math.random() * 1000 + 2000;

            const deg = Math.random() * Math.PI * 2;
            const distance = Math.random() * 50 + 1;
            star.x = Math.cos(deg) * distance;
            star.y = Math.sin(deg) * distance;
        }
    }

    hideStarryBackground = () => {
        if(this.starryTicker) {
            this.app.ticker.remove(this.starryTicker);
            this.starryTicker = null;
        }

        if (this.starryInterval) {
            clearInterval(this.starryInterval);
            this.starryInterval = null;
        }

        if (this.starryContainer) {
            this.starryContainer.removeChildren();
            this.app.stage.removeChild(this.starryContainer);
            this.starryContainer = null;
        }
    }

    updateDidClickSprite = (value) => {
        this.didClickSprite = value;
    }

    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;
    app.view.addEventListener('contextmenu', (event) => {
        event.preventDefault();
    });
    return app;
}

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