/*
 *  The ManaPlus Client
 *  Copyright (C) 2007-2009  The Mana World Development Team
 *  Copyright (C) 2009-2010  The Mana Developers
 *  Copyright (C) 2011-2020  The ManaPlus Developers
 *  Copyright (C) 2020-2023  The ManaVerse Developers
 *
 *  This file is part of The ManaPlus Client.
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include "gui/widgets/layoutarray.h"

#include "enums/gui/layouttype.h"

#include "gui/widgets/layoutcell.h"
#include "gui/widgets/widget.h"

#include <cassert>

#include "debug.h"

LayoutArray::LayoutArray() :
    mCells(),
    mSpacing(4)
{
}

LayoutArray::~LayoutArray()
{
    STD_VECTOR <STD_VECTOR <LayoutCell *> >::iterator
        i = mCells.begin();
    const STD_VECTOR <STD_VECTOR <LayoutCell *> >::iterator
        i_end = mCells.end();
    while (i != i_end)
    {
        STD_VECTOR< LayoutCell * >::iterator j = i->begin();
        const STD_VECTOR< LayoutCell * >::iterator j_end = i->end();
        while (j != j_end)
        {
            delete *j;
            ++j;
        }
        ++i;
    }
}

LayoutCell &LayoutArray::at(const int x, const int y,
                            const int w, const int h)
{
    resizeGrid(x + w, y + h);
    LayoutCell *&cell = mCells[CAST_SIZE(y)][static_cast<size_t>(x)];
    if (cell == nullptr)
        cell = new LayoutCell;
    return *cell;
}

void LayoutArray::resizeGrid(int w, const int h)
{
    const bool extW = (w != 0) && w > CAST_S32(mSizes[0].size());
    const bool extH = (h != 0) && h > CAST_S32(mSizes[1].size());

    if (!extW && !extH)
        return;

    if (extH)
    {
        mSizes[1].resize(CAST_SIZE(h), LayoutType::DEF);
        mCells.resize(CAST_SIZE(h));
        if (!extW)
            w = CAST_S32(mSizes[0].size());
    }

    if (extW)
        mSizes[0].resize(CAST_SIZE(w), LayoutType::DEF);

    STD_VECTOR <STD_VECTOR <LayoutCell *> >::iterator
        i = mCells.begin();
    const STD_VECTOR <STD_VECTOR <LayoutCell *> >::iterator
        i_end = mCells.end();
    while (i != i_end)
    {
        i->resize(CAST_SIZE(w), nullptr);
        ++i;
    }
}

void LayoutArray::setColWidth(const int n, const int w)
{
    resizeGrid(n + 1, 0);
    mSizes[0U][CAST_SIZE(n)] = w;
}

void LayoutArray::setRowHeight(const int n, const int h)
{
    resizeGrid(0, n + 1);
    mSizes[1][CAST_SIZE(n)] = h;
}

void LayoutArray::matchColWidth(const int n1, const int n2)
{
    resizeGrid(std::max(n1, n2) + 1, 0);
    const STD_VECTOR<int> widths = getSizes(0, LayoutType::DEF);
    const int s = std::max(widths[CAST_SIZE(n1)],
        widths[CAST_SIZE(n2)]);
    mSizes[0][CAST_SIZE(n1)] = s;
    mSizes[0][CAST_SIZE(n2)] = s;
}

void LayoutArray::extend(const int x, const int y, const int w, const int h)
{
    LayoutCell &cell = at(x, y, w, h);
    cell.mExtent[0] = w;
    cell.mExtent[1] = h;
}

LayoutCell &LayoutArray::place(Widget *const widget, const int x,
                               const int y, const int w, const int h)
{
    LayoutCell &cell = at(x, y, w, h);
    assert(cell.mType == LayoutCell::NONE);
    cell.mType = LayoutCell::WIDGET;
    cell.mWidget = widget;
    if (widget != nullptr)
    {
        cell.mSize[0] = w == 1 ? widget->getWidth() : 0;
        cell.mSize[1] = h == 1 ? widget->getHeight() : 0;
    }
    else
    {
        cell.mSize[0] = 1;
        cell.mSize[1] = 1;
    }
    cell.mExtent[0] = w;
    cell.mExtent[1] = h;
    cell.mHPadding = 0;
    cell.mVPadding = 0;
    cell.mAlign[0] = LayoutCell::FILL;
    cell.mAlign[1] = LayoutCell::FILL;
    int &cs = mSizes[0][CAST_SIZE(x)];
    int &rs = mSizes[1][CAST_SIZE(y)];
    if (cs == LayoutType::DEF && w == 1)
        cs = 0;
    if (rs == LayoutType::DEF && h == 1)
        rs = 0;
    return cell;
}

void LayoutArray::align(int &restrict pos, int &restrict size, const int dim,
                        LayoutCell const &restrict cell,
                        const int *restrict const sizes,
                        const int sizeCount) const
{
    if (dim < 0 || dim >= 2)
        return;
    int size_max = sizes[0];
    int cnt = cell.mExtent[dim];
    if ((sizeCount != 0) && cell.mExtent[dim] > sizeCount)
        cnt = sizeCount;

    for (int i = 1; i < cnt; ++i)
        size_max += sizes[i] + mSpacing;
    size = std::min<int>(cell.mSize[dim], size_max);

    switch (cell.mAlign[dim])
    {
        case LayoutCell::LEFT:
            return;
        case LayoutCell::RIGHT:
            pos += size_max - size;
            return;
        case LayoutCell::CENTER:
            pos += (size_max - size) / 2;
            return;
        case LayoutCell::FILL:
            size = size_max;
            return;
        default:
            logger->log1("LayoutArray::align unknown layout");
            return;
    }
}

STD_VECTOR<int> LayoutArray::getSizes(const int dim, int upp) const
{
    if (dim < 0 || dim >= 2)
        return mSizes[1];

    const int gridW = CAST_S32(mSizes[0].size());
    const int gridH = CAST_S32(mSizes[1].size());
    STD_VECTOR<int> sizes = mSizes[dim];

    // Compute minimum sizes.
    for (int gridY = 0; gridY < gridH; ++gridY)
    {
        for (int gridX = 0; gridX < gridW; ++gridX)
        {
            const LayoutCell *const cell = mCells[CAST_SIZE(gridY)]
                [CAST_SIZE(gridX)];
            if ((cell == nullptr) || cell->mType == LayoutCell::NONE)
                continue;

            if (cell->mExtent[dim] == 1)
            {
                const int n = (dim == 0 ? gridX : gridY);
                const int s = cell->mSize[dim] + cell->mVPadding * 2;
                if (s > sizes[CAST_SIZE(n)])
                    sizes[CAST_SIZE(n)] = s;
            }
        }
    }

    if (upp == LayoutType::DEF)
        return sizes;

    // Compute the FILL sizes.
    const int nb = CAST_S32(sizes.size());
    int nbFill = 0;
    for (int i = 0; i < nb; ++i)
    {
        if (mSizes[CAST_SIZE(dim)][static_cast<size_t>(i)]
            <= LayoutType::DEF)
        {
            ++nbFill;
            if (mSizes[CAST_SIZE(dim)][static_cast<size_t>(i)] ==
                LayoutType::SET ||
                sizes[CAST_SIZE(i)] <= LayoutType::DEF)
            {
                sizes[CAST_SIZE(i)] = 0;
            }
        }
        upp -= sizes[CAST_SIZE(i)] + mSpacing;
    }
    upp = upp + mSpacing;

    if (nbFill == 0)
        return sizes;

    for (int i = 0; i < nb; ++i)
    {
        if (mSizes[CAST_SIZE(dim)][static_cast<size_t>(i)] >
            LayoutType::DEF)
        {
            continue;
        }

        const int s = upp / nbFill;
        sizes[CAST_SIZE(i)] += s;
        upp -= s;
        --nbFill;
    }

    return sizes;
}

int LayoutArray::getSize(const int dim) const
{
    STD_VECTOR<int> sizes = getSizes(dim, LayoutType::DEF);
    int size = 0;
    const int nb = CAST_S32(sizes.size());
    for (int i = 0; i < nb; ++i)
    {
        if (sizes[CAST_SIZE(i)] > LayoutType::DEF)
            size += sizes[CAST_SIZE(i)];
        size += mSpacing;
    }
    return size - mSpacing;
}

void LayoutArray::reflow(const int nx, const int ny,
                         const int nw, const int nh)
{
    const int gridW = CAST_S32(mSizes[0].size());
    const int gridH = CAST_S32(mSizes[1].size());

    STD_VECTOR<int> widths  = getSizes(0, nw);
    STD_VECTOR<int> heights = getSizes(1, nh);

    const int szW = CAST_S32(widths.size());
    const int szH = CAST_S32(heights.size());
    int y = ny;
    for (int gridY = 0; gridY < gridH; ++gridY)
    {
        int x = nx;
        for (int gridX = 0; gridX < gridW; ++gridX)
        {
            LayoutCell *const cell = mCells[CAST_SIZE(gridY)]
                [CAST_SIZE(gridX)];
            if ((cell != nullptr) && cell->mType != LayoutCell::NONE)
            {
                int dx = x;
                int dy = y;
                int dw = 0;
                int dh = 0;
                align(dx, dw, 0, *cell,
                    &widths[CAST_SIZE(gridX)], szW - gridX);
                align(dy, dh, 1, *cell,
                    &heights[CAST_SIZE(gridY)], szH - gridY);
                cell->reflow(dx, dy, dw, dh);
            }
            x += widths[CAST_SIZE(gridX)] + mSpacing;
        }
        y += heights[CAST_SIZE(gridY)] + mSpacing;
    }
}