package org.simantics.scl.compiler.elaboration.modules;

import java.util.ArrayList;

import org.cojen.classfile.TypeDesc;
import org.simantics.scl.compiler.common.datatypes.Constructor;
import org.simantics.scl.compiler.internal.codegen.types.JavaTypeTranslator;
import org.simantics.scl.compiler.types.TCon;
import org.simantics.scl.compiler.types.TVar;
import org.simantics.scl.compiler.types.Type;
import org.simantics.scl.compiler.types.Types;
import org.simantics.scl.compiler.types.kinds.KArrow;
import org.simantics.scl.compiler.types.kinds.Kind;
import org.simantics.scl.compiler.types.kinds.Kinds;

public abstract class TypeConstructor extends TypeDescriptor {
    public Kind kind;
    
    public TVar[] parameters;
    public Type type;
    
    public Constructor[] constructors = Constructor.EMPTY_ARRAY;
    public String documentation;
    
    /**
     * A data type is open if it can be constructed without
     * constructors listed above.
     */
    public boolean isOpen = true;
    
    public TypeConstructor(Kind kind) {
        super(null);
        this.kind = kind;
    }
    
    public TypeConstructor(TCon name, Kind kind) {
        super(name);
        this.kind = kind;
        
        ArrayList<TVar> vars = new ArrayList<TVar>(2);
        for(Kind cur = kind; cur instanceof KArrow;) {
            KArrow arrow = (KArrow)cur;
            vars.add(Types.var(arrow.domain));
            cur = arrow.range;
        }
        this.parameters = vars.toArray(new TVar[vars.size()]);
        this.type = Types.apply(name, parameters);
    }
    
    public TypeConstructor(TCon name, TVar ... parameters) {
        super(name);
        setType(name, parameters);
        Kind kind = Kinds.STAR;
        for(int i = parameters.length-1;i>=0;--i)
            kind = Kinds.arrow(parameters[i].getKind(), kind);
        this.kind = kind;
    }
    
    public void setType(TCon name, TVar ... parameters) {
        this.name = name;
        this.parameters = parameters;
        this.type = Types.apply(name, parameters);
    }
        
    public void setConstructors(Constructor ... constructors) {
        this.constructors = constructors;
    }

    public abstract TypeDesc construct(JavaTypeTranslator translator, Type[] parameters);

    @Override
    public void setDocumentation(String documentation) {
        this.documentation = documentation;
    }
    
    @Override
    public Kind getKind() {
        return kind;
    }
    
    @Override
    public String getDocumentation() {
        return documentation;
    }
}