// Copyright (c) 2011-2013, Pacific Biosciences of California, Inc.
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// SUCH DAMAGE.

// Author: David Alexander

#pragma once

#include <algorithm>
#include <cassert>
#include <utility>

#include "Matrix/SparseMatrix.hpp"
#include "LFloat.hpp"

using std::min;
using std::max;

namespace ConsensusCore {
    //
    // Nullability
    //
    inline const SparseMatrix&
    SparseMatrix::Null()
    {
        static SparseMatrix* nullObj = new SparseMatrix(0, 0);
        return *nullObj;
    }

    inline bool
    SparseMatrix::IsNull() const
    {
        return (Rows() == 0 && Columns() == 0);
    }

    //
    // Size information
    //
    inline const int
    SparseMatrix::Rows() const
    {
        return nRows_;
    }

    inline const  int
    SparseMatrix::Columns() const
    {
        return nCols_;
    }

    //
    // Entry range queries per column
    //
    inline void
    SparseMatrix::StartEditingColumn(int j, int hintBegin, int hintEnd)
    {
        assert(columnBeingEdited_ == -1);
        columnBeingEdited_ = j;
        if (columns_[j] != NULL)
        {
            columns_[j]->ResetForRange(hintBegin, hintEnd);
        } else {
            columns_[j] = new SparseVector(Rows(), hintBegin, hintEnd);
        }
    }

    inline void
    SparseMatrix::FinishEditingColumn(int j, int usedRowsBegin, int usedRowsEnd)
    {
        assert(columnBeingEdited_ == j);
        usedRanges_[j] = std::make_pair(usedRowsBegin, usedRowsEnd);
        DEBUG_ONLY(CheckInvariants(columnBeingEdited_));
        columnBeingEdited_ = -1;
    }

    inline std::pair<int, int>
    SparseMatrix::UsedRowRange(int j) const
    {
        return usedRanges_[j];
    }

    inline bool
    SparseMatrix::IsColumnEmpty(int j) const
    {
        return (usedRanges_[j].first >= usedRanges_[j].second);
    }

    //
    // Accessors
    //
    inline const float&
    SparseMatrix::operator() (int i, int j) const
    {
        static const float emptyCell = Zero<lfloat>();
        if (columns_[j] == NULL)
        {
            return emptyCell;
        }
        else
        {
            return (*columns_[j])(i);
        }
    }

    inline float
    SparseMatrix::Get(int i, int j) const
    {
        return (*this)(i, j);
    }

    inline void
    SparseMatrix::Set(int i, int j, float v)
    {
        columns_[j]->Set(i, v);
    }

    inline void
    SparseMatrix::ClearColumn(int j)
    {
        usedRanges_[j] = std::make_pair(0, 0);
        columns_[j]->Clear();
        DEBUG_ONLY(CheckInvariants(j);)
    }

    //
    // SSE
    //
    inline __m128
    SparseMatrix::Get4(int i, int j) const
    {
        if (columns_[j] == NULL)
        {
            return Zero4<lfloat>();
        }
        else
        {
            return columns_[j]->Get4(i);
        }
    }

    inline void
    SparseMatrix::Set4(int i, int j, __m128 v4)
    {
        columns_[j]->Set4(i, v4);
    }
}