class Vector2 {
	constructor(x, y) {
		this.x = x;
		this.y = y;
	}
}

class Shimeji {
	constructor(url_path) {
		this.url_path = url_path;
		this.x = 0;
		this.y = 0;
		this.offset = null;
		this.mouseHover = false;
		this.mouseDown = false;
		this.isFalling = true;
		this.isWalking = false;
		this.oldRect = null;
		this.rect = null;
		this.mousePos = new Vector2(0,0);
		this.frame_duration = 200;
		this.lastmove = Date.now();
        
        //Animations
        this.anim_fast_grap = ["/shime9.png"];
        this.anim_slow_grap = ["/shime7.png"];
        this.anim_idle_grap = ["/shime5.png"];
        this.anim_falling = ["/shime4.png"];
        this.anim_idle = ["/shime1.png"];
        this.anim_walk = ["/shime2.png", "/shime3.png"];

		this.renderElem = document.createElement("img");
		this.renderElem.src = this.url_path + "/shime1.png";
		this.renderElem.style.position = "fixed";
		this.renderElem.style.zIndex = 1021;
		this.renderElem.setAttribute("draggable", "false");
		document.body.appendChild(this.renderElem);
		this.updateInterval = setInterval(this.update.bind(this), 50);
		this.move(0, 0);
		this.renderElem.addEventListener("mouseenter", this.onMouseEnter.bind(this));
		this.renderElem.addEventListener("mouseleave", this.onMouseLeave.bind(this));
		this.renderElem.addEventListener("contextmenu", this.onContextMenu.bind(this));
		window.addEventListener("mousedown", this.onMouseDown.bind(this));
		window.addEventListener("mouseup", this.onMouseUp.bind(this));
		window.addEventListener("mousemove", this.onMouseMove.bind(this));
        
	}

	move(x, y) {
		this.x = x;
		this.y = y;
		this.renderElem.style.left = x + "px";
		this.renderElem.style.top = y + "px";
	}

	onMouseMove(e) {
		this.lastmove = Date.now();
		this.mousePos = new Vector2(e.clientX, e.clientY);
		const rect = this.renderElem.getBoundingClientRect();
		if(this.mouseDown && (this.mouseHover || this.offset)) {
			if(this.offset == null) {
				this.offset = new Vector2(e.clientX - rect.left, e.clientY - rect.top);
			}
			this.move(e.clientX - this.offset.x, e.clientY - this.offset.y);
		} else {
			this.offset = null;
		}
		this.previewsEvent = e;
	}

	onMouseDown(e) {
		this.mouseDown = true;
	}

	onMouseUp(e) {
		this.mouseDown = false;
		this.offset = null;
	}

	onMouseEnter(e) {
		this.mouseHover = true;
	}

	onMouseLeave(e) {
		this.mouseHover = false;
	}

	onContextMenu(e) {
		e.preventDefault();
	}

	randomMove() {
		this.lastmove = Date.now();
		this.rect = this.renderElem.getBoundingClientRect();
		this.mousePos = new Vector2(Math.round(Math.random() * window.innerWidth), Math.round(Math.random() * window.innerHeight));
		console.log(this.mousePos);
	}

	update() {
		this.rect = this.renderElem.getBoundingClientRect();
		if(Date.now() - this.lastmove > 5000) {
			this.randomMove();
		}
		if(this.offset == null) {
			if(this.rect.bottom <= window.innerHeight -1) {
				this.isFalling = true;
				this.move(this.rect.x, Math.min(this.rect.y + 10, window.innerHeight - this.rect.height));
			} else {
				this.isFalling = false;
				if(Math.abs(this.rect.x - this.mousePos.x + (this.rect.width / 2)) > 5) {
					this.isWalking = true;
					this.move(this.rect.x + (5 * -Math.sign(this.rect.x - this.mousePos.x + (this.rect.width / 2))), this.rect.y);
				} else {
					this.isWalking = false;
				}
			}
		}
		this.animate();
		this.oldRect = this.rect;
	}

	getCurrenFrame(frame_array) {
		let animeIndex = Math.floor((new Date().getTime() / this.frame_duration) % frame_array.length);
		return frame_array[animeIndex];
	}

	animate() {
		let new_frame = this.renderElem.src;
		if(this.oldRect == null) this.oldRect = this.rect;
		let diffX = this.oldRect.x - this.rect.x;
		if(this.offset) {
			// grap animation
			if(Math.abs(diffX) > 20) {
				new_frame = this.url_path + this.getCurrenFrame(this.anim_fast_grap); // fast grap
			} else if(Math.abs(diffX) > 10){
				new_frame = this.url_path + this.getCurrenFrame(this.anim_slow_grap); // slow grap
			} else {
				new_frame = this.url_path + this.getCurrenFrame(this.anim_idle_grap); // idle grap
			}
			this.renderElem.style.transform = diffX > 0 ? "scaleX(-1)" : "scaleX(1)";
		} else if (this.isFalling) {
			// falling animation
			new_frame = this.url_path + this.getCurrenFrame(this.anim_falling); // falling
		} else {
			// on floor animation
			if(diffX == 0) {
				new_frame = this.url_path + this.getCurrenFrame(this.anim_idle); // idle floor
			} else {
				new_frame = this.url_path + this.getCurrenFrame(this.anim_walk); //walk
				this.renderElem.style.transform = diffX > 0 ? "scaleX(1)" : "scaleX(-1)";
			}
		}
		if(new_frame != this.renderElem.getAttribute("src")) {
			console.log("change design");
			this.renderElem.src = new_frame;
		}
	}
}

console.log("LibShimeji from sorlinv.fr is loaded");