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package io.virtdata.libbasics.shared.unary_int;

import io.virtdata.annotations.Categories;
import io.virtdata.annotations.Category;
import io.virtdata.annotations.Example;
import io.virtdata.annotations.ThreadSafeMapper;
import io.virtdata.libbasics.core.threadstate.SharedState;

import java.util.HashMap;
import java.util.function.Function;
import java.util.function.IntUnaryOperator;

@Categories(Category.state)
@ThreadSafeMapper
public class Load implements IntUnaryOperator {

    private final String name;
    private final Function nameFunc;
    private final int defaultValue;


    @Example({"Load('foo')","for the current thread, load an int value from the named variable"})
    public Load(String name) {
        this.name = name;
        this.nameFunc =null;
        this.defaultValue=0;
    }

    @Example({"Load('foo',42)","for the current thread, load an int value from the named variable, or return the default value if it is undefined."})
    public Load(String name, int defaultValue) {
        this.name = name;
        this.nameFunc =null;
        this.defaultValue=defaultValue;
    }

    @Example({"Load(NumberNameToString())","for the current thread, load an int value from the named variable, where the variable name is provided by a function."})
    public Load(Function nameFunc) {
        this.name = null;
        this.nameFunc =nameFunc;
        this.defaultValue=0;
    }

    @Example({"Load(NumberNameToString(),42)","for the current thread, load an int value from the named variable, where the variable name is provided by a function, or the default value if the named variable is undefined."})
    public Load(Function nameFunc, int defaultValue) {
        this.name = null;
        this.nameFunc =nameFunc;
        this.defaultValue=defaultValue;
    }


    @Override
    public int applyAsInt(int operand) {
        HashMap map = SharedState.tl_ObjectMap.get();
        String varname = nameFunc !=null ? String.valueOf(nameFunc.apply(operand)) : name;
        Object o = map.getOrDefault(varname,defaultValue);
        return (int) o;
    }

}