// SPDX-FileCopyrightText: Chris Pressey, the original author of this work, has dedicated it to the public domain.
// For more information, please refer to <https://unlicense.org/>
// SPDX-License-Identifier: Unlicense

Playfield = function() {
    this._store = {};
    this.min_x = undefined;
    this.min_y = undefined;
    this.max_x = undefined;
    this.max_y = undefined;

    this.get = function(x, y) {
        return this._store[x+','+y];
    };

    this.put = function(x, y, value) {
        if (this.min_x === undefined || x < this.min_x) this.min_x = x;
        if (this.max_x === undefined || x > this.max_x) this.max_x = x;
        if (this.min_y === undefined || y < this.min_y) this.min_y = y;
        if (this.max_y === undefined || y > this.max_y) this.max_y = y;
        if (value === undefined) {
            delete this._store[x+','+y];
        }
        this._store[x+','+y] = value;
    };
          
    this.foreach = function(fun) {
        for (var y = this.min_y; y <= this.max_y; y++) {
            for (var x = this.min_x; x <= this.max_x; x++) {
                var key = x+','+y;
                var value = this._store[key];
                if (value === undefined)
                    continue;
                var result = fun(x, y, value);
                if (result !== undefined) {
                    if (result === ' ') {
                        result = undefined;
                    }
                    this.put(x, y, result);
                }
            }
        }
    };

    this.load = function(x, y, map, string) {
        var lx = x;
        var ly = y;
        for (var i = 0; i < string.length; i++) {
            var c = string.charAt(i);
            if (c === '\n') {
                lx = x;
                ly++;
            } else if (c === ' ') {
                this.put(lx, ly, undefined);
                lx++;
            } else if (c === '\r') {
            } else {
                this.put(lx, ly, map[c]);
                lx++;
            }
        }
    };
};