/**
 *  LogarithmPlotter - 2D plotter software to make BODE plots, sequences and distribution functions.
 *  Copyright (C) 2023  Ad5001
 * 
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 * 
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 * 
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */

.pragma library

.import "polyfill.js" as Polyfill


const CONSTANTS = {
    "π": Math.PI,
    "pi": Math.PI,
    "inf": Infinity,
    "infinity": Infinity,
    "∞": Infinity,
    "e": Math.E
};
const CONSTANTS_LIST = Object.keys(CONSTANTS);

const FUNCTIONS = {
    // The functions commented are the one either not implemented 
    // in the parser, or not to be used for autocompletion.
    // Unary operators
    //'+': Number,
    //'-': (x) => -x,
    //'!'
    // Other operations
    'length': (s) => Array.isArray(s) ? s.length : String(s).length,
    // Boolean functions
    'not': (x) => !x,
    // Math functions
    'abs': Math.abs,
    'acos': Math.acos,
    'acosh': Math.acosh,
    'asin': Math.asin,
    'asinh': Math.asinh,
    'atan': Math.atan,
    'atan2': Math.atan2,
    'atanh': Math.atanh,
    'cbrt': Math.cbrt,
    'ceil': Math.ceil,
    //'clz32': Math.clz32,
    'cos': Math.cos,
    'cosh': Math.cosh,
    'exp': Math.exp,
    'expm1': Math.expm1,
    'floor': Math.floor,
    //'fround': Math.fround,
    'hypot': Math.hypot,
    //'imul': Math.imul,
    'lg': Math.log10,
    'ln': Math.log,
    'log': Math.log,
    'log10': Math.log10,
    'log1p': Math.log1p,
    'log2': Math.log2,
    'max': Math.max,
    'min': Math.min,
    'pow': Math.log2,
    'random': Math.random,
    'round': Math.round,
    'sign': Math.sign,
    'sin': Math.sin,
    'sinh': Math.sinh,
    'sqrt': Math.sqrt,
    'tan': Math.tan,
    'tanh': Math.tanh,
    'trunc': Math.trunc,
    // Functions in expr-eval, ported here.
    'fac': Polyfill.factorial,
    'gamma': Polyfill.gamma,
    'Γ': Polyfill.gamma,
    'roundTo': (x, exp) => Number(x).toFixed(exp),
    'map': Polyfill.arrayMap,
    'fold': Polyfill.arrayFold,
    'filter': Polyfill.arrayFilter,
    'indexOf': Polyfill.indexOf,
    'join': Polyfill.arrayJoin,
    // Integral & derivative (only here for autocomplete).
    'integral': () => 0, // TODO: Implement
    'derivative': () => 0,
}
const FUNCTIONS_LIST = Object.keys(FUNCTIONS);
// TODO: Complete
const DERIVATIVES = {
    "abs": "abs(<1>)/<1>",
    "acos": "-derivate(<1>)/sqrt(1-(<1>)^2)",
    "acosh": "derivate(<1>)/sqrt((<1>)^2-1)",
    "asin": "derivate(<1>)/sqrt(1-(<1>)^2)",
    "asinh": "derivate(<1>)/sqrt((<1>)^2+1)",
    "atan": "derivate(<1>)/(1+(<1>)^2)",
    "atan2": "",
}
const INTEGRALS = {
    "abs": "integrate(<1>)*sign(<1>)",
    "acos": "",
    "acosh": "",
    "asin": "",
    "asinh": "",
    "atan": "",
    "atan2": "",
}