/**
 * Copyright (c) 2017-2021 mol* contributors, licensed under MIT, See LICENSE file for more info.
 *
 * @author Alexander Rose <alexander.rose@weirdbyte.de>
 * @author Panagiotis Tourlas <panagiot_tourlov@hotmail.com>
 * @author Koya Sakuma
 */

import * as P from '../../../mol-util/monadic-parser';
import * as h from '../helper';
import { MolScriptBuilder } from '../../../mol-script/language/builder';
const B = MolScriptBuilder;
import { sstrucMap, sstrucDict, properties } from './properties';
import { operators } from './operators';
import { keywords } from './keywords';
import { functions } from './functions';
import { OperatorList } from '../types';
import { Transpiler } from '../transpiler';

// const propertiesDict = h.getPropertyRules(properties)

// <, <=, = or ==, >=, >, and !=
// lt, le, eq, ge, gt, and ne, =~
const valueOperators: OperatorList = [
    {
        '@desc': 'multiplication, division',
        '@examples': [],
        name: 'mul-div',
        type: h.binaryLeft,
        rule: P.MonadicParser.regexp(/\s*(\*|\/)\s*/, 1),
        map: (op, e1, e2) => {
            switch (op) {
                case '*': return B.core.math.mult([e1, e2]);
                case '/': return B.core.math.div([e1, e2]);
                default: throw new Error(`value operator '${op}' not supported`);
            }
        }
    },
    {
        '@desc': 'addition, substraction',
        '@examples': [],
        name: 'add-sub',
        type: h.binaryLeft,
        rule: P.MonadicParser.regexp(/\s*(-|\+)\s*/, 1),
        map: (op, e1, e2) => {
            switch (op) {
                case '-': return B.core.math.sub([e1, e2]);
                case '+': return B.core.math.add([e1, e2]);
                default: throw new Error(`value operator '${op}' not supported`);
            }
        }
    },
    {
        '@desc': 'value comparisons',
        '@examples': [],
        name: 'comparison',
        type: h.binaryLeft,
        rule: P.MonadicParser.alt(P.MonadicParser.regexp(/\s*(=~|==|>=|<=|=|!=|>|<)\s*/, 1), P.MonadicParser.whitespace.result('=')),
        map: (op, e1, e2) => {
            // console.log(op, e1, e2)
            let expr;
            if (e1.head.name === 'structure-query.atom-property.macromolecular.secondary-structure-flags') {
                expr = B.core.flags.hasAny([e1, sstrucMap(e2)]);
            } else if (e2.head.name === 'structure-query.atom-property.macromolecular.secondary-structure-flags') {
                expr = B.core.flags.hasAny([e2, sstrucMap(e1)]);
            } else if (e1.head.name === 'core.type.regex') {
                expr = B.core.str.match([e1, B.core.type.str([e2])]);
            } else if (e2.head.name === 'core.type.regex') {
                expr = B.core.str.match([e2, B.core.type.str([e1])]);
            } else if (op === '=~') {
                if (e1.head.name) {
                    expr = B.core.str.match([
                        B.core.type.regex([`^${e2}$`, 'i']),
                        B.core.type.str([e1])
                    ]);
                } else {
                    expr = B.core.str.match([
                        B.core.type.regex([`^${e1}$`, 'i']),
                        B.core.type.str([e2])
                    ]);
                }
            }
            if (!expr) {
                if (e1.head.name) e2 = h.wrapValue(e1, e2);
                if (e2.head.name) e1 = h.wrapValue(e2, e1);
                switch (op) {
                    case '=':
                    case '==':
                        expr = B.core.rel.eq([e1, e2]);
                        break;
                    case '!=':
                        expr = B.core.rel.neq([e1, e2]);
                        break;
                    case '>':
                        expr = B.core.rel.gr([e1, e2]);
                        break;
                    case '<':
                        expr = B.core.rel.lt([e1, e2]);
                        break;
                    case '>=':
                        expr = B.core.rel.gre([e1, e2]);
                        break;
                    case '<=':
                        expr = B.core.rel.lte([e1, e2]);
                        break;
                    default: throw new Error(`value operator '${op}' not supported`);
                }
            }
            return B.struct.generator.atomGroups({ 'atom-test': expr });
        }
    }
];

const lang = P.MonadicParser.createLanguage({
    Parens: function (r: any) {
        return P.MonadicParser.alt(
            r.Parens,
            r.Operator,
            r.Expression
        ).wrap(P.MonadicParser.string('('), P.MonadicParser.string(')'));
    },

    Expression: function (r: any) {
        return P.MonadicParser.alt(
            r.RangeListProperty,
	    r.NamedAtomProperties,
            r.ValueQuery,
            r.Keywords,
        );
    },

    NamedAtomProperties: function () {
        return P.MonadicParser.alt(...h.getNamedPropertyRules(properties));
    },

    Keywords: () => P.MonadicParser.alt(...h.getKeywordRules(keywords)),

    ValueRange: function (r: any) {
        return P.MonadicParser.seq(
            r.Value
                .skip(P.MonadicParser.regexp(/\s+TO\s+/i)),
            r.Value
        ).map(x => ({ range: x }));
    },

    RangeListProperty: function (r: any) {
        return P.MonadicParser.seq(
            P.MonadicParser.alt(...h.getPropertyNameRules(properties, /\s/))
                .skip(P.MonadicParser.whitespace),
            P.MonadicParser.alt(
                r.ValueRange,
                r.Value
            ).sepBy1(P.MonadicParser.whitespace)
        ).map(x => {
            const [property, values] = x;
            const listValues: (string | number)[] = [];
            const rangeValues: any[] = [];

            values.forEach((v: any) => {
                if (v.range) {
                    rangeValues.push(
                        B.core.rel.inRange([property, v.range[0], v.range[1]])
                    );
                } else {
                    listValues.push(h.wrapValue(property, v, sstrucDict));
                }
            });

            const rangeTest = h.orExpr(rangeValues);
            const listTest = h.valuesTest(property, listValues);

            let test;
            if (rangeTest && listTest) {
                test = B.core.logic.or([rangeTest, listTest]);
            } else {
                test = rangeTest ? rangeTest : listTest;
            }

	    return B.struct.generator.atomGroups({ [h.testLevel(property)]: test });
	    //  h.testLevel is not working for unknown reason, so relaced it by hardcoded 'atom-test'
            //	    console.log(h.testLevel(property));
	    // return B.struct.generator.atomGroups({ 'atom-test': test });
        });
    },

    Operator: function (r: any) {
        return h.combineOperators(operators, P.MonadicParser.alt(r.Parens, r.Expression, r.ValueQuery));
    },

    Query: function (r: any) {
        return P.MonadicParser.alt(
            r.Operator,
            r.Parens,
            r.Expression
        ).trim(P.MonadicParser.optWhitespace);
    },

    Number: function () {
        return P.MonadicParser.regexp(/-?(0|[1-9][0-9]*)([.][0-9]+)?([eE][+-]?[0-9]+)?/)
            .map(Number)
            .desc('number');
    },

    String: function () {
        const w = h.getReservedWords(properties, keywords, operators)
            .sort(h.strLenSortFn).map(h.escapeRegExp).join('|');
        return P.MonadicParser.alt(
            P.MonadicParser.regexp(new RegExp(`(?!(${w}))[A-Z0-9_]+`, 'i')),
            P.MonadicParser.regexp(/'((?:[^"\\]|\\.)*)'/, 1),
            P.MonadicParser.regexp(/"((?:[^"\\]|\\.)*)"/, 1).map((x: any) => B.core.type.regex([`^${x}$`, 'i']))
        ).desc('string');
    },

    Value: function (r: any) {
        return P.MonadicParser.alt(r.Number, r.String);
    },

    ValueParens: function (r: any) {
        return P.MonadicParser.alt(
            r.ValueParens,
            r.ValueOperator,
            r.ValueExpressions
        ).wrap(P.MonadicParser.string('('), P.MonadicParser.string(')'));
    },

    ValuePropertyNames: function () {
        return P.MonadicParser.alt(...h.getPropertyNameRules(properties, /=~|==|>=|<=|=|!=|>|<|\)|\s|\+|-|\*|\//i));
    },

    ValueOperator: function (r: any) {
        return h.combineOperators(valueOperators, P.MonadicParser.alt(r.ValueParens, r.ValueExpressions));
    },

    ValueExpressions: function (r: any) {
        return P.MonadicParser.alt(
            r.ValueFunctions,
            r.Value,
            r.ValuePropertyNames
        );
    },

    ValueFunctions: function (r: any) {
        return P.MonadicParser.alt(...h.getFunctionRules(functions, r.ValueOperator));
    },

    ValueQuery: function (r: any) {
        return P.MonadicParser.alt(
            r.ValueOperator.map((x: any) => {
                // if (!x.head || x.head.startsWith('core.math') || x.head.startsWith('structure-query.atom-property')) {
                if (!x.head.name || !x.head.name.startsWith('structure-query.generator')) {
                    throw new Error(`values must be part of an comparison, value '${x}'`);
                } else {
                    return x as any;
                }
            })
        );
    }
});

export const transpiler: Transpiler = str => lang.Query.tryParse(str);