package io.gitlab.jfronny.muscript;

import io.gitlab.jfronny.muscript.data.Scope;
import io.gitlab.jfronny.muscript.data.dynamic.*;

import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Random;

import static io.gitlab.jfronny.muscript.data.dynamic.DFinal.of;

public class StandardLib {
    private static final Random rnd = new Random();

    public static final SimpleDateFormat timeFormat = new SimpleDateFormat("HH:mm");
    public static final SimpleDateFormat dateFormat = new SimpleDateFormat("dd. MM. yyyy");

    public static Scope createScope() {
        return addTo(new Scope());
    }

    public static Scope addTo(Scope scope) {
        return scope
                .set("PI", Math.PI)
                .set("time", timeFormat.format(new Date()))
                .set("date", dateFormat.format(new Date()))

                .set("round", StandardLib::round)
                .set("floor", StandardLib::floor)
                .set("ceil", StandardLib::ceil)
                .set("abs", StandardLib::abs)
                .set("random", StandardLib::random)

                .set("toUpper", StandardLib::toUpper)
                .set("toLower", StandardLib::toLower)
                .set("contains", StandardLib::contains)
                .set("replace", StandardLib::replace)

                .set("listOf", StandardLib::listOf)
                .set("len", StandardLib::len)
                .set("isEmpty", StandardLib::isEmpty)
                .set("concat", StandardLib::concat)
                .set("filter", StandardLib::filter)
                .set("map", StandardLib::map)
                .set("flatMap", StandardLib::flatMap)
                .set("fold", StandardLib::fold)
                .set("forEach", StandardLib::forEach);
    }

    // Numbers
    public static DNumber round(DList args) {
        if (args.size() == 1) {
            return of(Math.round(args.get(0).asNumber().getValue()));
        } else if (args.size() == 2) {
            double x = Math.pow(10, (int) (double) args.get(1).asNumber().getValue());
            return of(Math.round(args.get(0).asNumber().getValue() * x) / x);
        } else {
            throw new IllegalArgumentException("Invalid number of arguments for round: expected 1 or 2 but got " + args.size());
        }
    }

    public static DNumber floor(DList args) {
        if (args.size() != 1) throw new IllegalArgumentException("Invalid number of arguments for floor: expected 1 but got " + args.size());
        return of(Math.floor(args.get(0).asNumber().getValue()));
    }

    public static DNumber ceil(DList args) {
        if (args.size() != 1) throw new IllegalArgumentException("Invalid number of arguments for ceil: expected 1 but got " + args.size());
        return of(Math.ceil(args.get(0).asNumber().getValue()));
    }

    public static DNumber abs(DList args) {
        if (args.size() != 1) throw new IllegalArgumentException("Invalid number of arguments for abs: expected 1 but got " + args.size());
        return of(Math.abs(args.get(0).asNumber().getValue()));
    }

    public static DNumber random(DList args) {
        if (args.size() == 0) return of(rnd.nextDouble());
        else if (args.size() == 2) {
            double min = args.get(0).asNumber().getValue();
            double max = args.get(1).asNumber().getValue();
            return of(min + (max - min) * rnd.nextDouble());
        }

        throw new IllegalArgumentException("Invalid number of arguments for random: expected 0 or 2 but got " + args.size());
    }

    // Strings
    public static DString toUpper(DList args) {
        if (args.size() != 1) throw new IllegalArgumentException("Invalid number of arguments for toUpper: expected 1 but got " + args.size());
        return of(args.get(0).asString().getValue().toUpperCase());
    }

    public static DString toLower(DList args) {
        if (args.size() != 1) throw new IllegalArgumentException("Invalid number of arguments for toLower: expected 1 but got " + args.size());
        return of(args.get(0).asString().getValue().toLowerCase());
    }

    public static DBool contains(DList args) {
        if (args.size() != 2) throw new IllegalArgumentException("Invalid number of arguments for contains: expected 2 but got " + args.size());
        return of(args.get(0).asString().getValue().contains(args.get(1).asString().getValue()));
    }

    public static DString replace(DList args) {
        if (args.size() != 3) throw new IllegalArgumentException("Invalid number of arguments for replace: expected 3 but got " + args.size());
        return of(args.get(0).asString().getValue().replace(args.get(1).asString().getValue(), args.get(2).asString().getValue()));
    }

    // Lists
    public static DList listOf(DList args) {
        return args;
    }

    public static DNumber len(DList args) {
        if (args.size() != 1) throw new IllegalArgumentException("Invalid number of arguments for len: expected 1 but got " + args.size());
        return of(args.get(0).asList().size());
    }

    public static DBool isEmpty(DList args) {
        if (args.size() != 1) throw new IllegalArgumentException("Invalid number of arguments for isEmpty: expected 1 but got " + args.size());
        return of(args.get(0).asList().isEmpty());
    }

    public static DList concat(DList args) {
        return of(args.getValue().stream().flatMap(s -> s.asList().getValue().stream()).toList());
    }

    public static DList filter(DList args) {
        if (args.size() != 2) throw new IllegalArgumentException("Invalid number of arguments for filter: expected at least 2 but got " + args.size());
        DCallable dc = args.get(1).asCallable();
        return of(args.get(0).asList().getValue().stream().filter(a -> dc.call(a).asBool().getValue()).toList());
    }

    public static DList map(DList args) {
        if (args.size() != 2) throw new IllegalArgumentException("Invalid number of arguments for map: expected at least 2 but got " + args.size());
        return of(args.get(0).asList().getValue().stream().<Dynamic<?>>map(args.get(1).asCallable()::call).toList());
    }

    public static DList flatMap(DList args) {
        if (args.size() != 2) throw new IllegalArgumentException("Invalid number of arguments for flatMap: expected at least 2 but got " + args.size());
        DCallable dc = args.get(1).asCallable();
        return of(args.get(0).asList().getValue().stream().flatMap(a -> dc.call(a).asList().getValue().stream()).toList());
    }

    public static Dynamic<?> fold(DList args) {
        if (args.size() != 3) throw new IllegalArgumentException("Invalid number of arguments for fold: expected at least 3 but got " + args.size());
        return args.get(0).asList().getValue().stream().reduce(args.get(1), args.get(2).asCallable()::call);
    }

    public static Dynamic<?> forEach(DList args) {
        if (args.size() != 2) throw new IllegalArgumentException("Invalid number of arguments for forEach: expected at least 2 but got " + args.size());
        Dynamic<?> result = new DNull();
        DCallable dc = args.get(1).asCallable();
        for (Dynamic<?> dynamic : args.get(0).asList().getValue()) {
            result = dc.call(dynamic);
        }
        return result;
    }
}