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

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.showCoordinates();
        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;
        });

    }

    activateMapMultiSelect = (fn) => {
        const mapMultiSelectHandle = (event) => {
            if (event.button !== 0) {
                return;
            }

            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 };

            // avoid trigger sprite event
            let hasHitSprite = false;
            for (let child of this.mapContainer.children) {
                if (child.data?.uuid) {
                    if (child.getBounds().contains(selectionStart.x, selectionStart.y)) {
                        hasHitSprite = true; break;
                    }
                }
            }

            if (!hasHitSprite) {
                isSelecting = true;
            }

            const handleMouseMove = (event) => {
                if (isSelecting) {
                    // 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) {
                    this.clearSelectedSprites();

                    // sprite show style which be selected
                    this.mapContainer.children.forEach(child => {
                        if (Tool.isSpriteInSelectionBox(child, this.selectionBox)) {
                            this.selectedSprites.push(child);
                            Tool.markSprite(child);
                        }
                    })
                    isSelecting = false;
                    this.selectionBox.clear();

                    // complete
                    if (fn) {
                        fn(this.selectedSprites, () => {
                            // trigger at end of selectionBox when fn happen mouseup
                            this.selectedSprites = [];
                            this.activateMapMultiSelect(fn);
                        });
                    }

                }

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

        this.mapContainer.parent.off('mousedown');
        this.mapContainer.parent.on('mousedown', mapMultiSelectHandle)
    }

    clearSelectedSprites = () => {
        if (this.selectedSprites && this.selectedSprites.length > 0) {
            this.selectedSprites.forEach(child => {
                Tool.unMarkSprite(child);
            })
        }
        this.selectedSprites = [];
    }

    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);
    }

    adaptScreen = () => {
        if (!this.mapContainer || !this.app) {
            return;
        }

        this.mapContainer.scale.set(1);
        this.mapContainer.position.set(0, 0);
        if (this.mapContainer.children.length === 0) {
            return;
        }

        let minX, maxX, minY, maxY;
        for (let sprite of this.mapContainer.children) {
            if (sprite?.data?.uuid) {
                let bounds = sprite.getBounds();
                minX = minX !== undefined ? Math.min(minX, bounds.x) : bounds.x;
                minY = minY !== undefined ? Math.min(minY, bounds.y) : bounds.y;
                maxX = maxX !== undefined ? Math.max(maxX, bounds.x + bounds.width) : bounds.x + bounds.width;
                maxY = maxY !== undefined ? Math.max(maxY, bounds.y + bounds.height) : bounds.y + bounds.height;
            }
        }

        this.scale = Math.min(
            this.app.renderer.width / (maxX - minX) * 0.8,
            this.app.renderer.height / (maxY - minY) * 0.8
        );

        let centerPoint = {
            x: (minX + maxX) / 2 * this.mapContainer.scale.x,
            y: (minY + maxY) / 2 * this.mapContainer.scale.y
        };

        new TWEEDLE.Tween(this.mapContainer.scale).easing(TWEEDLE.Easing.Quadratic.Out)
            .to({
                x: this.scale,
                y: this.scale
            }, 200).start();

        new TWEEDLE.Tween(this.mapContainer.position).easing(TWEEDLE.Easing.Quadratic.Out)
            .to({
                x: this.app.renderer.width / 2 - centerPoint.x * this.scale,
                y: this.app.renderer.height / 2 - centerPoint.y * this.scale
            }, 200).start();
    }

    showCoordinates = () => {
        const coordinatesText = new PIXI.Text('{ x: 0, y: 0 }', {
            fill: this.themeMode === 'dark' ? 0xffffff : 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 = () => {
        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);
    }

    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;
}