#define _USE_MATH_DEFINES
#include "arrow_item.h"

#include "../../client/settings/cache_settings.h"
#include "../../game/player/player_actions.h"
#include "../../game/player/player_logic.h"
#include "../player/player_target.h"
#include "../z_values.h"
#include "../zones/card_zone.h"
#include "card_item.h"

#include <QDebug>
#include <QGraphicsScene>
#include <QGraphicsSceneMouseEvent>
#include <QPainter>
#include <QtMath>
#include <libcockatrice/card/card_info.h>
#include <libcockatrice/protocol/pb/command_attach_card.pb.h>
#include <libcockatrice/protocol/pb/command_create_arrow.pb.h>
#include <libcockatrice/protocol/pb/command_delete_arrow.pb.h>
#include <libcockatrice/utility/color.h>
#include <libcockatrice/utility/zone_names.h>

ArrowItem::ArrowItem(QSharedPointer<const ArrowData> _data, ArrowTarget *_startItem, ArrowTarget *_targetItem)
    : data(std::move(_data)), startItem(_startItem), targetItem(_targetItem)
{
    setZValue(ZValues::ARROWS);

    auto doUpdate = [this]() {
        if (startItem && targetItem) {
            updatePath();
        }
    };

    if (startItem) {
        connect(startItem, &ArrowTarget::scenePositionChanged, this, doUpdate);
        connect(startItem, &QObject::destroyed, this, &ArrowItem::onTargetDestroyed);
    }
    if (targetItem) {
        connect(targetItem, &ArrowTarget::scenePositionChanged, this, doUpdate);
        connect(targetItem, &QObject::destroyed, this, &ArrowItem::onTargetDestroyed);
    }

    if (startItem && targetItem) {
        updatePath();
    }
}

void ArrowItem::onTargetDestroyed()
{
    emit requestDeletion(data->creatorId, data->id);
}

void ArrowItem::delArrow()
{
    if (targetItem) {
        targetItem->setBeingPointedAt(false);
    }
    deleteLater();
}

void ArrowItem::updatePath()
{
    if (!targetItem) {
        return;
    }

    QPointF endPoint = targetItem->mapToScene(
        QPointF(targetItem->boundingRect().width() / 2, targetItem->boundingRect().height() / 2));
    updatePath(endPoint);
}

void ArrowItem::updatePath(const QPointF &endPoint)
{
    const double arrowWidth = 15.0;
    const double headWidth = 40.0;
    const double headLength =
        headWidth / qPow(2, 0.5); // aka headWidth / sqrt (2) but this produces a compile error with MSVC++
    const double phi = 15;

    if (!startItem) {
        return;
    }

    QPointF startPoint =
        startItem->mapToScene(QPointF(startItem->boundingRect().width() / 2, startItem->boundingRect().height() / 2));
    QLineF line(startPoint, endPoint);
    qreal lineLength = line.length();

    prepareGeometryChange();
    if (lineLength < 30) {
        path = QPainterPath();
    } else {
        QPointF c(lineLength / 2, qTan(phi * M_PI / 180) * lineLength);

        QPainterPath centerLine;
        centerLine.moveTo(0, 0);
        centerLine.quadTo(c, QPointF(lineLength, 0));

        double percentage = 1 - headLength / lineLength;
        QPointF arrowBodyEndPoint = centerLine.pointAtPercent(percentage);
        QLineF testLine(arrowBodyEndPoint, centerLine.pointAtPercent(percentage + 0.001));
        qreal alpha = testLine.angle() - 90;
        QPointF endPoint1 =
            arrowBodyEndPoint + arrowWidth / 2 * QPointF(qCos(alpha * M_PI / 180), -qSin(alpha * M_PI / 180));
        QPointF endPoint2 =
            arrowBodyEndPoint + arrowWidth / 2 * QPointF(-qCos(alpha * M_PI / 180), qSin(alpha * M_PI / 180));
        QPointF point1 =
            endPoint1 + (headWidth - arrowWidth) / 2 * QPointF(qCos(alpha * M_PI / 180), -qSin(alpha * M_PI / 180));
        QPointF point2 =
            endPoint2 + (headWidth - arrowWidth) / 2 * QPointF(-qCos(alpha * M_PI / 180), qSin(alpha * M_PI / 180));

        path = QPainterPath(-arrowWidth / 2 * QPointF(qCos((phi - 90) * M_PI / 180), qSin((phi - 90) * M_PI / 180)));
        path.quadTo(c, endPoint1);
        path.lineTo(point1);
        path.lineTo(QPointF(lineLength, 0));
        path.lineTo(point2);
        path.lineTo(endPoint2);
        path.quadTo(c, arrowWidth / 2 * QPointF(qCos((phi - 90) * M_PI / 180), qSin((phi - 90) * M_PI / 180)));
        path.lineTo(-arrowWidth / 2 * QPointF(qCos((phi - 90) * M_PI / 180), qSin((phi - 90) * M_PI / 180)));
    }

    setPos(startPoint);
    setTransform(QTransform().rotate(-line.angle()));
}

void ArrowItem::paint(QPainter *painter, const QStyleOptionGraphicsItem * /*option*/, QWidget * /*widget*/)
{
    QColor paintColor(data->color);
    if (fullColor) {
        paintColor.setAlpha(200);
    } else {
        paintColor.setAlpha(150);
    }
    painter->setBrush(paintColor);
    painter->drawPath(path);
}

void ArrowItem::mousePressEvent(QGraphicsSceneMouseEvent *event)
{
    if (!data->isLocalCreator) {
        event->ignore();
        return;
    }

    for (auto *item : scene()->items(event->scenePos())) {
        if (qgraphicsitem_cast<CardItem *>(item)) {
            event->ignore();
            return;
        }
    }

    event->accept();
    if (event->button() == Qt::RightButton) {
        emit requestDeletion(data->creatorId, data->id);
    }
}

// ArrowDragItem

ArrowDragItem::ArrowDragItem(PlayerLogic *_owner, ArrowTarget *_startItem, const QColor &_color, int _deleteInPhase)
    : ArrowItem(QSharedPointer<ArrowData>::create(ArrowData{.creatorId = _owner->getPlayerInfo()->getId(),
                                                            .isLocalCreator = true,
                                                            .id = -1,
                                                            .color = _color}),
                _startItem,
                nullptr),
      player(_owner), deleteInPhase(_deleteInPhase)
{
}

void ArrowDragItem::addChildArrow(ArrowDragItem *child)
{
    childArrows.append(child);
}

void ArrowDragItem::mouseMoveEvent(QGraphicsSceneMouseEvent *event)
{
    if (targetLocked || !startItem) {
        return;
    }

    const QPointF endPos = event->scenePos();

    ArrowTarget *cursorItem = nullptr;
    qreal cursorItemZ = -1;
    for (auto *item : scene()->items(endPos)) {
        ArrowTarget *candidate = nullptr;
        if (auto *card = qgraphicsitem_cast<CardItem *>(item)) {
            candidate = card;
        } else if (auto *pt = qgraphicsitem_cast<PlayerTarget *>(item)) {
            candidate = pt;
        }

        if (candidate && candidate->zValue() > cursorItemZ) {
            cursorItem = candidate;
            cursorItemZ = candidate->zValue();
        }
    }

    if (cursorItem != targetItem) {
        if (targetItem) {
            disconnect(positionConnection);
            targetItem->setBeingPointedAt(false);
        }

        targetItem = cursorItem;
        fullColor = (cursorItem != nullptr);

        if (cursorItem && cursorItem != startItem) {
            cursorItem->setBeingPointedAt(true);
            positionConnection =
                connect(cursorItem, &ArrowTarget::scenePositionChanged, this, [this]() { updatePath(); });
        }
    }

    targetItem ? updatePath() : updatePath(endPos);
    update();

    for (auto *child : childArrows) {
        child->mouseMoveEvent(event);
    }
}

void ArrowDragItem::mouseReleaseEvent(QGraphicsSceneMouseEvent *event)
{
    if (!startItem) {
        return;
    }

    if (targetItem && targetItem != startItem) {
        CardItem *startCard = qgraphicsitem_cast<CardItem *>(startItem);
        // For now, we can safely assume that the start item is always a card.
        // The target item can be a player as well.
        if (!startCard) {
            delArrow();
            return;
        }

        CardZoneLogic *startZone = startCard->getState()->getZone();

        Command_CreateArrow cmd;
        cmd.mutable_arrow_color()->CopyFrom(convertQColorToColor(data->color));
        cmd.set_start_player_id(startZone->getPlayer()->getPlayerInfo()->getId());
        cmd.set_start_zone(startZone->getName().toStdString());
        cmd.set_start_card_id(startCard->getState()->getId());

        if (auto *targetCard = qgraphicsitem_cast<CardItem *>(targetItem)) {
            CardZoneLogic *targetZone = targetCard->getState()->getZone();
            cmd.set_target_player_id(targetZone->getPlayer()->getPlayerInfo()->getId());
            cmd.set_target_zone(targetZone->getName().toStdString());
            cmd.set_target_card_id(targetCard->getState()->getId());
        } else if (auto *targetPlayer = qgraphicsitem_cast<PlayerTarget *>(targetItem)) {
            cmd.set_target_player_id(targetPlayer->getOwner()->getPlayerInfo()->getId());
        } else {
            delArrow();
            return;
        }

        // if the card is in hand then we will move the card to stack or table as part of drawing the arrow
        if (startZone->getName() == ZoneNames::HAND) {
            startCard->playCard(false);
            CardInfoPtr ci = startCard->getState()->getCard().getCardPtr();
            bool playToStack = SettingsCache::instance().getPlayToStack();
            if (ci && ((!playToStack && ci->getUiAttributes().tableRow == 3) ||
                       (playToStack && ci->getUiAttributes().tableRow != 0 &&
                        startCard->getState()->getZone()->getName() != ZoneNames::STACK))) {
                cmd.set_start_zone(ZoneNames::STACK);
            } else {
                cmd.set_start_zone(playToStack ? ZoneNames::STACK : ZoneNames::TABLE);
            }
        }

        if (deleteInPhase != 0) {
            cmd.set_delete_in_phase(deleteInPhase);
        }

        player->getPlayerActions()->sendGameCommand(cmd);
    }

    delArrow();
    for (auto *child : childArrows) {
        child->mouseReleaseEvent(event);
    }
}

// ArrowAttachItem
ArrowAttachItem::ArrowAttachItem(ArrowTarget *_startItem)
    : ArrowItem(
          QSharedPointer<ArrowData>::create(ArrowData{.creatorId = _startItem->getOwner()->getPlayerInfo()->getId(),
                                                      .isLocalCreator = true,
                                                      .id = -1,
                                                      .color = Qt::green}),
          _startItem,
          nullptr),
      player(_startItem->getOwner())
{
}

void ArrowAttachItem::addChildArrow(ArrowAttachItem *child)
{
    childArrows.append(child);
}

void ArrowAttachItem::mouseMoveEvent(QGraphicsSceneMouseEvent *event)
{
    if (targetLocked || !startItem) {
        return;
    }

    const QPointF endPos = event->scenePos();

    ArrowTarget *cursorItem = nullptr;
    qreal cursorItemZ = -1;
    for (auto *item : scene()->items(endPos)) {
        if (auto *card = qgraphicsitem_cast<CardItem *>(item)) {
            if (card->zValue() > cursorItemZ) {
                cursorItem = card;
                cursorItemZ = card->zValue();
            }
        }
    }

    if (cursorItem != targetItem) {
        if (targetItem) {
            disconnect(positionConnection);
            targetItem->setBeingPointedAt(false);
        }

        targetItem = cursorItem;
        fullColor = (cursorItem != nullptr);

        if (cursorItem && cursorItem != startItem) {
            cursorItem->setBeingPointedAt(true);
            positionConnection =
                connect(cursorItem, &ArrowTarget::scenePositionChanged, this, [this]() { updatePath(); });
        }
    }

    targetItem ? updatePath() : updatePath(endPos);
    update();

    for (auto *child : childArrows) {
        child->mouseMoveEvent(event);
    }
}

void ArrowAttachItem::mouseReleaseEvent(QGraphicsSceneMouseEvent *event)
{
    if (!startItem) {
        return;
    }

    // Attaching could move startItem under the current cursor position, causing all children to retarget to it right
    // before they are processed. Prevent that.
    for (auto *child : childArrows) {
        child->setTargetLocked(true);
    }

    if (targetItem && targetItem != startItem) {
        auto *startCard = qgraphicsitem_cast<CardItem *>(startItem);
        auto *targetCard = qgraphicsitem_cast<CardItem *>(targetItem);
        if (startCard && targetCard) {
            attachCards(startCard, targetCard);
        }
    }

    delArrow();
    for (auto *child : childArrows) {
        child->mouseReleaseEvent(event);
    }
}

void ArrowAttachItem::attachCards(CardItem *startCard, const CardItem *targetCard)
{
    if (targetCard->getState()->getAttachedTo() || targetCard->getState()->getZone()->getName() != ZoneNames::TABLE) {
        return;
    }

    // move card onto table first if attaching from some other zone
    if (startCard->getState()->getZone()->getName() != ZoneNames::TABLE) {
        player->getPlayerActions()->playCardToTable(startCard, false);
    }

    Command_AttachCard cmd;
    cmd.set_start_zone(ZoneNames::TABLE);
    cmd.set_card_id(startCard->getState()->getId());
    cmd.set_target_player_id(targetCard->getState()->getZone()->getPlayer()->getPlayerInfo()->getId());
    cmd.set_target_zone(targetCard->getState()->getZone()->getName().toStdString());
    cmd.set_target_card_id(targetCard->getState()->getId());
    player->getPlayerActions()->sendGameCommand(cmd);
}