package io.trygvis.calamus.engine.domain;

import org.mvel2.MVEL;
import org.mvel2.ParserContext;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.ManyToOne;
import java.io.Serializable;
import java.util.HashMap;
import java.util.Map;

@Entity
public class ProcessTrigger extends AbstractEntity {

    @ManyToOne
    private Process process;

    @Column(length = 1000)
    private String mvel;

    transient Serializable expression;

    public Process getProcess() {
        return process;
    }

    public String getMvel() {
        return mvel;
    }

    // -----------------------------------------------------------------------
    //
    // -----------------------------------------------------------------------

    private Serializable getExpression() {
        if (expression != null) {
            return expression;
        }
        ParserContext ctx = new ParserContext();
        ctx.setStrongTyping(true);
        ctx.addInput("artifact", Artifact.class);
        return expression = MVEL.compileExpression(mvel, ctx);
    }

    public boolean matches(Artifact artifact) {
        Map<String, Object> vars = new HashMap<>();
        vars.put("artifact", artifact);
        return MVEL.executeExpression(getExpression(), vars, Boolean.class);
    }
}