import {Game} from "./Game.js";
import {directions} from "./Snake.js";


export class Tile {
    /**
     * A tile of the game grid
     * @param {int} x
     * @param {int} y
     * @param {tiles} type
     * @param {Game} game
     */
    constructor(x, y, type = tiles.EMPTY, game) {
        if (typeof x === "number" && x >= 0 && x % 1 === 0)
            this.x = x;
        else
            throw new InvalidTileOption("x");

        if (typeof y === "number" && y >= 0 && y % 1 === 0)
            this.y = y;
        else
            throw new InvalidTileOption("y");

        if (type && Object.values(tiles).find(t => t === type))
            this.type = type;
        else
            throw new InvalidTileOption("type");

        if (game && game instanceof Game)
            this.game = game;
        else
            throw new InvalidTileOption("game");
    }

    /**
     * Draw the tile on the grid
     */
    draw() {
        const canvasPos = this.getCanvasPos(), size = this.getSize();

        this.game.ctx.beginPath();

        this.game.ctx.globalCompositeOperation = "destination-out";
        this.game.ctx.fillRect(...canvasPos, ...size);
        this.game.ctx.globalCompositeOperation = "source-over";

        const pxsize = Math.round(size[0]/12);
        const width = canvasPos[0];
        const height = canvasPos[1];

        switch (this.type) {
            case tiles.EMPTY:
                this.game.ctx.strokeStyle = "#999999";
                this.game.ctx.rect(...canvasPos, ...size);
                break;
            case tiles.APPLE:
                if (!pxsize) {
                    this.game.ctx.fillStyle = "#ff0000";
                    this.game.ctx.fillRect(...canvasPos, ...size);
                } else {
                    this.game.ctx.fillStyle = "#00ffff";
                    this.game.ctx.fillRect(width+pxsize, height+pxsize, 10*pxsize, 10*pxsize);

                    this.game.ctx.fillStyle = "#000000";

                    this.game.ctx.fillRect(width+4*pxsize, height, pxsize*4, pxsize);
                    this.game.ctx.fillRect(width+4*pxsize, height+11*pxsize, pxsize*4, pxsize);

                    for (const i of [2,5,8])
                        this.game.ctx.fillRect(width+i*pxsize, height+pxsize, pxsize*2, pxsize);

                    for (const i of [1,4,7,10])
                        this.game.ctx.fillRect(width+i*pxsize, height+2*pxsize, pxsize, pxsize*2);

                    this.game.ctx.fillRect(width, height+4*pxsize, pxsize, pxsize*4);
                    this.game.ctx.fillRect(width+11*pxsize, height+4*pxsize, pxsize, pxsize*4);

                    for (const i of [1,5,6,10])
                        this.game.ctx.fillRect(width+i*pxsize, height+8*pxsize, pxsize, pxsize*2);

                    for (const i of [2,5,8])
                        this.game.ctx.fillRect(width+i*pxsize, height+10*pxsize, pxsize*2, pxsize);

                    for (const i of [3,8,2,9])
                        this.game.ctx.fillRect(width+i*pxsize, height+4*pxsize, pxsize, pxsize);

                    for (const i of [1,3,8,10])
                        this.game.ctx.fillRect(width+i*pxsize, height+6*pxsize, pxsize, pxsize);

                    for (const i of [4,7])
                        this.game.ctx.fillRect(width+i*pxsize, height+7*pxsize, pxsize, pxsize);

                    this.game.ctx.globalCompositeOperation = "destination-out";
                    for (const [i,j] of [[1,1],[10,1],[1,10],[10,10]])
                        this.game.ctx.fillRect(width+i*pxsize, height+j*pxsize, pxsize, pxsize);
                    this.game.ctx.globalCompositeOperation = "source-over";
                }
                break;
            case tiles.HEAD:
                if (!pxsize) {
                    this.game.ctx.fillStyle = "#00ff5f";
                    this.game.ctx.fillRect(...canvasPos, ...size);
                } else {
                    this.rotate(canvasPos, size);
                    this.game.ctx.fillStyle = "#FF4294";
                    this.game.ctx.fillRect(width + 6 * pxsize, height + pxsize, 6 * pxsize, 10 * pxsize);
                    this.game.ctx.fillRect(width + 4 * pxsize, height + 2 * pxsize, 6 * pxsize, 8 * pxsize);
                    this.game.ctx.fillRect(width + 2 * pxsize, height + 3 * pxsize, 6 * pxsize, 6 * pxsize);
                    this.game.ctx.fillRect(width + pxsize, height + 5 * pxsize, pxsize, 2 * pxsize);
                    this.game.ctx.fillStyle = "#000000";

                    this.game.ctx.fillRect(width + 6 * pxsize, height, pxsize * 6, pxsize);
                    this.game.ctx.fillRect(width + 6 * pxsize, height + 11 * pxsize, pxsize * 6, pxsize);

                    this.game.ctx.fillRect(width + 4 * pxsize, height + pxsize, pxsize * 2, pxsize);
                    this.game.ctx.fillRect(width + 4 * pxsize, height + 10 * pxsize, pxsize * 2, pxsize);

                    this.game.ctx.fillRect(width + 2 * pxsize, height + 2 * pxsize, pxsize * 2, pxsize);
                    this.game.ctx.fillRect(width + 2 * pxsize, height + 9 * pxsize, pxsize * 2, pxsize);

                    this.game.ctx.fillRect(width + pxsize, height + 7 * pxsize, pxsize, pxsize * 2);
                    this.game.ctx.fillRect(width + pxsize, height + 3 * pxsize, pxsize, pxsize * 2);

                    this.game.ctx.fillRect(width, height + 5 * pxsize, pxsize, pxsize * 2);

                    this.game.ctx.fillRect(width + 6 * pxsize, height + 4 * pxsize, pxsize * 4, pxsize);
                    this.game.ctx.fillRect(width + 6 * pxsize, height + 7 * pxsize, pxsize * 4, pxsize);
                    this.game.ctx.setTransform(1, 0, 0, 1, 0, 0);
                }
                break;
            case tiles.BODY:
                if (!pxsize) {
                    this.game.ctx.fillStyle = "#0d5317";
                    this.game.ctx.fillRect(...canvasPos, ...size);
                } else {
                    this.rotate(canvasPos, size);
                    this.game.ctx.fillStyle = "#FF4294";
                    this.game.ctx.fillRect(width, height, 12*pxsize, 12*pxsize);
                    this.game.ctx.fillStyle = "#000000";

                    this.game.ctx.fillRect(width, height, pxsize*12, pxsize);
                    this.game.ctx.fillRect(width, height+11*pxsize, pxsize*12, pxsize);

                    for (const [i,j] of [[1,1],[1,9],[2,3],[2,7],[3,5],[5,1],[5,9],[6,3],[6,7],[7,5],[9,1],[9,9],[10,3],[10,7],[11,5]])
                        this.game.ctx.fillRect(width+i*pxsize, height+j*pxsize, pxsize, pxsize*2);

                    this.game.ctx.setTransform(1, 0, 0, 1, 0, 0);
                }
                break;
            case tiles.TAIL:
                if (!pxsize) {
                    this.game.ctx.fillStyle = "#efff00";
                    this.game.ctx.fillRect(...canvasPos, ...size);
                } else {
                    this.rotate(canvasPos, size);
                    this.game.ctx.fillStyle = "#FF4294";
                    this.game.ctx.fillRect(width, height+pxsize, pxsize, 10*pxsize);
                    this.game.ctx.fillRect(width+pxsize, height+2*pxsize, pxsize, 8*pxsize);
                    this.game.ctx.fillRect(width+2*pxsize, height+3*pxsize, 2*pxsize, 6*pxsize);
                    this.game.ctx.fillRect(width+4*pxsize, height+4*pxsize, 3*pxsize, 4*pxsize);
                    this.game.ctx.fillRect(width+7*pxsize, height+5*pxsize, 4*pxsize, 2*pxsize);
                    this.game.ctx.fillStyle = "#000000";

                    this.game.ctx.fillRect(width, height, pxsize, pxsize);
                    this.game.ctx.fillRect(width, height+11*pxsize, pxsize, pxsize);
                    this.game.ctx.fillRect(width+pxsize, height+pxsize, pxsize, pxsize);
                    this.game.ctx.fillRect(width+pxsize, height+10*pxsize, pxsize, pxsize);

                    this.game.ctx.fillRect(width+2*pxsize, height+2*pxsize, 2*pxsize, pxsize);
                    this.game.ctx.fillRect(width+2*pxsize, height+9*pxsize, 2*pxsize, pxsize);

                    this.game.ctx.fillRect(width+4*pxsize, height+3*pxsize, 3*pxsize, pxsize);
                    this.game.ctx.fillRect(width+4*pxsize, height+8*pxsize, 3*pxsize, pxsize);

                    this.game.ctx.fillRect(width+7*pxsize, height+4*pxsize, 4*pxsize, pxsize);
                    this.game.ctx.fillRect(width+7*pxsize, height+7*pxsize, 4*pxsize, pxsize);

                    this.game.ctx.fillRect(width+11*pxsize, height+5*pxsize, pxsize, 2*pxsize);
                    this.game.ctx.fillRect(width+5*pxsize, height+5*pxsize, pxsize, 2*pxsize);
                    this.game.ctx.fillRect(width, height+4*pxsize, pxsize, 4*pxsize);

                    this.game.ctx.fillRect(width+pxsize, height+3*pxsize, pxsize, pxsize);
                    this.game.ctx.fillRect(width+pxsize, height+8*pxsize, pxsize, pxsize);
                    this.game.ctx.fillRect(width+4*pxsize, height+4*pxsize, pxsize, pxsize);
                    this.game.ctx.fillRect(width+4*pxsize, height+7*pxsize, pxsize, pxsize);
                    this.game.ctx.setTransform(1, 0, 0, 1, 0, 0);
                }
                break;
        }

        this.game.ctx.stroke();
    }

    getDirection() {
        const np = this.game.snake.body[this.game.snake.body.findIndex(([x,y]) => x === this.x && y === this.y)-1];
        const d = [this.x, this.y].map((n, i) => -(n - np[i]));

        return Object.values(directions).find(([x, y]) => d[0] === x && d[1] === y);
    }

    rotate(canvasPos, size) {
        const cx = canvasPos[0] + 0.5 * size[0];
        const cy = canvasPos[1] + 0.5 * size[1];

        this.game.ctx.translate(cx, cy);
        switch (this.type === tiles.HEAD? this.game.lastDirection : this.getDirection()) {
            case directions.UP:
                this.game.ctx.rotate(Math.PI / 2);
                break;
            case directions.DOWN:
                this.game.ctx.rotate(-Math.PI / 2);
                break;
            case directions.RIGHT:
                this.game.ctx.rotate(-Math.PI);
                break;
            case directions.LEFT:
                break;
        }
        this.game.ctx.translate(-cx, -cy);
    }

    /**
     * Get the tile position on the canvas
     * @returns {[int, int]}
     */
    getCanvasPos() {
        return [this.getSize()[0]*this.x, this.getSize()[1]*this.y]
    }

    /**
     * Get the tile size on the canvas
     * @returns {[int, int]}
     */
    getSize() {
        const s = Math.min(Math.round(this.game.ctx.canvas.width/this.game.size[0]), Math.round(this.game.ctx.canvas.height/this.game.size[1]));
        return [s, s]
    }
}

export class InvalidTileOption extends Error {
    /**
     * @param {string} name
     */
    constructor(name) {
        super(`Invalid Tile option: ${name}`);
    }
}

export const tiles = {
    EMPTY: "empty",
    APPLE: "apple",
    HEAD: "head",
    BODY: "body",
    TAIL: "tail"
};