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package com.oracle.graal.python.parser.sst;

import java.util.ArrayList;
import java.util.BitSet;
import java.util.List;

import com.oracle.graal.python.nodes.PNode;
import com.oracle.graal.python.nodes.argument.keywords.ConcatKeywordsNodeGen;
import com.oracle.graal.python.nodes.argument.positional.AppendPositionalStarargsNode;
import com.oracle.graal.python.nodes.argument.positional.ConcatPositionalStarargsNode;
import com.oracle.graal.python.nodes.expression.ExpressionNode;
import com.oracle.graal.python.nodes.literal.KeywordLiteralNode;
import com.oracle.graal.python.nodes.literal.ListLiteralNode;
import com.oracle.graal.python.util.PythonUtils;

import static com.oracle.graal.python.parser.sst.FactorySSTVisitor.ts;

public final class ArgListBuilder {

    private static final SSTNode[] EMPTY_SSTN = new SSTNode[0];

    private List<SSTNode> args;
    private List<SSTNode> nameArgNodes;
    private List<String> nameArgNames;
    private List<SSTNode> kwArg;
    private SSTNode nakedForComp;
    private BitSet isStarArgBitset;
    private int firstStarArgIndex = -1;

    public ArgListBuilder() {
        // default
    }

    public ArgListBuilder(int argCount, int namedArgCount, int kwArgCount) {
        this.args = new ArrayList<>(argCount);
        this.nameArgNodes = new ArrayList<>(namedArgCount);
        this.nameArgNames = new ArrayList<>(namedArgCount);
        this.kwArg = new ArrayList<>(kwArgCount);
        this.isStarArgBitset = new BitSet(argCount);
    }

    public void addArg(SSTNode value) {
        if (args == null) {
            args = new ArrayList<>();
        }
        args.add(value);
    }

    public ExpressionNode[] getArgs(SSTreeVisitor<PNode> visitor) {
        ExpressionNode[] result;
        if (args == null || args.isEmpty()) {
            result = ExpressionNode.EMPTY_ARRAY;
        } else {
            int len = firstStarArgIndex < 0 ? args.size() : firstStarArgIndex;
            result = new ExpressionNode[len];
            for (int i = 0; i < len; i++) {
                result[i] = (ExpressionNode) args.get(i).accept(visitor);
            }
        }
        return result;
    }

    public SSTNode[] getArgs() {
        return args == null ? EMPTY_SSTN : args.toArray(new SSTNode[args.size()]);
    }

    protected SSTNode[] getNameArgNodes() {
        return nameArgNodes == null ? EMPTY_SSTN : nameArgNodes.toArray(new SSTNode[nameArgNodes.size()]);
    }

    protected String[] getNameArgNames() {
        return nameArgNames == null ? PythonUtils.EMPTY_STRING_ARRAY : nameArgNames.toArray(new String[nameArgNames.size()]);
    }

    protected int getFirstStarArgIndex() {
        return firstStarArgIndex;
    }

    protected void setFirstStarArgIndex(int starArgIndex) {
        this.firstStarArgIndex = starArgIndex;
    }

    protected boolean isStarArgAt(int i) {
        return isStarArgBitset != null && isStarArgBitset.get(i);
    }

    protected SSTNode[] getKwArg() {
        return kwArg == null ? EMPTY_SSTN : kwArg.toArray(new SSTNode[kwArg.size()]);
    }

    public void addNamedArg(String name, SSTNode value) {
        if (nameArgNodes == null) {
            nameArgNodes = new ArrayList<>();
            nameArgNames = new ArrayList<>();
        }
        nameArgNodes.add(value);
        nameArgNames.add(name);
    }

    public ExpressionNode[] getNameArgs(SSTreeVisitor<PNode> visitor) {
        ExpressionNode[] result;
        if (nameArgNodes == null || nameArgNodes.isEmpty()) {
            result = ExpressionNode.EMPTY_ARRAY;
        } else {
            int len = nameArgNodes.size();
            result = new ExpressionNode[len];
            for (int i = 0; i < len; i++) {
                result[i] = new KeywordLiteralNode((ExpressionNode) nameArgNodes.get(i).accept(visitor), ts(nameArgNames.get(i)));
            }
        }
        return result;
    }

    public boolean hasNameArg() {
        return !(nameArgNodes == null || nameArgNodes.isEmpty());
    }

    public boolean hasNameArg(String name) {
        return nameArgNames != null && nameArgNames.contains(name);
    }

    public void addKwArg(SSTNode value) {
        if (kwArg == null) {
            kwArg = new ArrayList<>();
        }
        kwArg.add(value);
    }

    public boolean hasKwArg() {
        return kwArg != null;
    }

    public ExpressionNode getKwArgs(SSTreeVisitor<PNode> visitor) {
        ExpressionNode result = null;
        if (kwArg != null && !kwArg.isEmpty()) {
            int len = kwArg.size();
            if (len == 1) {
                result = (ExpressionNode) kwArg.get(0).accept(visitor);
            } else {
                ExpressionNode[] expressions = new ExpressionNode[len];
                for (int i = 0; i < len; i++) {
                    expressions[i] = (ExpressionNode) kwArg.get(i).accept(visitor);
                }
                result = ConcatKeywordsNodeGen.create(expressions);
            }
        }
        return result;
    }

    public void addStarArg(SSTNode value) {
        addArg(value);
        if (isStarArgBitset == null) {
            isStarArgBitset = new BitSet(args.size());
        }
        if (firstStarArgIndex < 0) {
            firstStarArgIndex = args.size() - 1;
        }
        isStarArgBitset.set(args.size() - 1);
    }

    public ExpressionNode getStarArgs(SSTreeVisitor<PNode> visitor) {
        ExpressionNode result = null;
        if (firstStarArgIndex >= 0) {
            int starArgCount = args.size() - firstStarArgIndex;
            if (starArgCount > 1) {
                result = ListLiteralNode.create(ExpressionNode.EMPTY_ARRAY);
                for (int i = firstStarArgIndex; i < args.size(); i++) {
                    ExpressionNode value = (ExpressionNode) args.get(i).accept(visitor);
                    if (isStarArgAt(i)) {
                        result = ConcatPositionalStarargsNode.create(result, value);
                    } else {
                        result = AppendPositionalStarargsNode.create(result, value);
                    }
                }
            } else {
                result = (ExpressionNode) args.get(firstStarArgIndex).accept(visitor);
            }
        }
        return result;
    }

    public boolean hasNakedForComp() {
        return nakedForComp != null;
    }

    public SSTNode getNakedForComp() {
        return nakedForComp;
    }

    public void addNakedForComp(SSTNode node) {
        setNakedForComp(node);
        addArg(node);
    }

    public void setNakedForComp(SSTNode nakedForComp) {
        this.nakedForComp = nakedForComp;
    }
}
