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#include "clangfunctionhintmodel.h"

#include "clangcompletionchunkstotextconverter.h"

#include <cplusplus/SimpleLexer.h>

namespace ClangCodeModel {
namespace Internal {

using namespace CPlusPlus;

ClangFunctionHintModel::ClangFunctionHintModel(const ClangBackEnd::CodeCompletions &functionSymbols)
    : m_functionSymbols(functionSymbols)
    , m_currentArg(-1)
{
}

void ClangFunctionHintModel::reset()
{
}

int ClangFunctionHintModel::size() const
{
    return m_functionSymbols.size();
}

QString ClangFunctionHintModel::text(int index) const
{
    const ClangBackEnd::CodeCompletionChunks chunks = m_functionSymbols.at(index).chunks();
    const QString signatureWithEmphasizedCurrentParameter
        = CompletionChunksToTextConverter::convertToFunctionSignature(chunks, m_currentArg + 1);

    return signatureWithEmphasizedCurrentParameter;
}

int ClangFunctionHintModel::activeArgument(const QString &prefix) const
{
    int argnr = 0;
    int parcount = 0;
    SimpleLexer tokenize;
    Tokens tokens = tokenize(prefix);
    for (int i = 0; i < tokens.count(); ++i) {
        const Token &tk = tokens.at(i);
        if (tk.is(T_LPAREN))
            ++parcount;
        else if (tk.is(T_RPAREN))
            --parcount;
        else if (! parcount && tk.is(T_COMMA))
            ++argnr;
    }

    if (parcount < 0)
        return -1;

    if (argnr != m_currentArg)
        m_currentArg = argnr;

    return argnr;
}

} // namespace Internal
} // namespace ClangCodeModel