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 * 2. Redistributions in binary form must reproduce the above copyright notice, this list of
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package com.oracle.truffle.llvm.parser.model.symbols.constants.aggregate;

import com.oracle.truffle.llvm.parser.model.globals.GlobalValueSymbol;
import com.oracle.truffle.llvm.parser.model.symbols.Symbols;
import com.oracle.truffle.llvm.parser.model.symbols.constants.AbstractConstant;
import com.oracle.truffle.llvm.parser.model.symbols.constants.Constant;
import com.oracle.truffle.llvm.runtime.types.ArrayType;
import com.oracle.truffle.llvm.runtime.types.StructureType;
import com.oracle.truffle.llvm.runtime.types.Type;
import com.oracle.truffle.llvm.runtime.types.VectorType;
import com.oracle.truffle.llvm.runtime.types.symbols.Symbol;

public abstract class AggregateConstant extends AbstractConstant {

    private final Symbol[] elements;

    AggregateConstant(Type type, int size) {
        super(type);
        this.elements = new Symbol[size];
    }

    public Symbol getElement(int idx) {
        return elements[idx];
    }

    public int getElementCount() {
        return elements.length;
    }

    public void replaceElement(int index, Symbol replacement) {
        if (!(replacement instanceof Constant || replacement instanceof GlobalValueSymbol)) {
            throw new IllegalStateException("Values can only be replaced by Constants or Globals!");
        }
        elements[index] = replacement;
    }

    @Override
    public String toString() {
        final StringBuilder sb = new StringBuilder();
        for (int i = 0; i < getElementCount(); i++) {
            if (i > 0) {
                sb.append(", ");
            }
            Symbol value = getElement(i);
            sb.append(value.getType()).append(" ").append(value);
        }
        return sb.toString();
    }

    public static AggregateConstant fromData(Type type, long[] data) {
        final AggregateConstant aggregateConstant;
        final Type elementType;
        if (type instanceof ArrayType) {
            final ArrayType arrayType = (ArrayType) type;
            elementType = arrayType.getElementType();
            aggregateConstant = new ArrayConstant(arrayType, data.length);
        } else if (type instanceof VectorType) {
            final VectorType vectorType = (VectorType) type;
            elementType = vectorType.getElementType();
            aggregateConstant = new VectorConstant((VectorType) type, data.length);
        } else {
            throw new RuntimeException("Cannot create constant from data: " + type);
        }

        for (int i = 0; i < data.length; i++) {
            aggregateConstant.replaceElement(i, Constant.createFromData(elementType, data[i]));
        }

        return aggregateConstant;
    }

    public static AggregateConstant fromSymbols(Symbols symbols, Type type, int[] valueIndices) {
        final AggregateConstant aggregateConstant;
        if (type instanceof ArrayType) {
            aggregateConstant = new ArrayConstant((ArrayType) type, valueIndices.length);
        } else if (type instanceof StructureType) {
            aggregateConstant = new StructureConstant((StructureType) type, valueIndices.length);
        } else if (type instanceof VectorType) {
            aggregateConstant = new VectorConstant((VectorType) type, valueIndices.length);
        } else {
            throw new RuntimeException("No value constant implementation for " + type);
        }

        for (int elementIndex = 0; elementIndex < valueIndices.length; elementIndex++) {
            aggregateConstant.replaceElement(elementIndex, symbols.getSymbol(valueIndices[elementIndex], aggregateConstant, elementIndex));
        }

        return aggregateConstant;
    }
}