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package io.virtdata.libbasics.shared.stateful.from_long;

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.LongFunction;
import java.util.function.LongToDoubleFunction;

/**
 * Load a value from a named thread-local variable, where the variable
 * name is fixed or a generated variable name from a provided function.
 * If the named variable is not defined, then the default value is returned.
 */
@Categories(Category.state)
@ThreadSafeMapper
public class LoadDouble implements LongToDoubleFunction {

    private final String name;
    private final LongFunction nameFunc;
    private final double defaultValue;

    @Example({"LoadDouble('foo')","for the current thread, load a double value from the named variable."})
    public LoadDouble(String name) {
        this.name = name;
        this.nameFunc=null;
        this.defaultValue=0.0D;
    }

    @Example({"LoadDouble('foo',23D)","for the current thread, load a double value from the named variable," +
            "or the default value if the named variable is not defined."})
    public LoadDouble(String name, double defaultValue) {
        this.name = name;
        this.nameFunc=null;
        this.defaultValue=defaultValue;
    }

    @Example({"LoadDouble(NumberNameToString())","for the current thread, load a double value from the named variable, " +
            "where the variable name is provided by a function."})
    public LoadDouble(LongFunction nameFunc) {
        this.name=null;
        this.nameFunc = nameFunc;
        this.defaultValue=0.0D;
    }

    @Example({"LoadDouble(NumberNameToString(),23D)","for the current thread, load a double value from the named variable," +
            "where the variable name is provided by a function, or the default value if the named" +
            "variable is not defined."})
    public LoadDouble(LongFunction nameFunc, double defaultValue) {
        this.name=null;
        this.nameFunc = nameFunc;
        this.defaultValue=defaultValue;
    }

    @Override
    public double applyAsDouble(long value) {
        HashMap map = SharedState.tl_ObjectMap.get();
        String varname=(nameFunc!=null) ? String.valueOf(nameFunc.apply(value)) : name;
        Object loaded = map.getOrDefault(varname, defaultValue);
        return (Double) loaded;
    }
}
    

    

    

            

    

            



    
    






    
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