#include "splitview.h"
#include "baseview.h"
#include <QPainter>
#include <libConfig.h>

using namespace SplitFrame;
using namespace Config;

SplitView::SplitView(RectCom *first, RectCom *next, QWidget *parent) : QWidget(parent) {
    this->split_info_value = std::make_tuple(SplitType::SPLIT_H, 100, 7);
    this->child_store << first;
    this->child_store << next;

    setMouseTracking(true);
}

SplitFrame::SplitView::~SplitView() {
    for (auto &it : children()) {
        auto widget = qobject_cast<QWidget *>(it);
        if (widget) {
            widget->setParent(nullptr);
        }
    }
}

QWidget *SplitView::bind() const { return const_cast<SplitView *>(this); }

ViewPresent *SplitView::viewPanel() const { return parentRes()->viewPanel(); }

ViewRes *SplitView::parentRes() const { return parent_inst; }

void SplitView::setParentRes(ViewRes *pinst) {
    this->parent_inst = pinst;
    QWidget::setParent(pinst != nullptr ? pinst->bind() : nullptr);

    for (auto &c : child_store)
        c->setParentRes(this);
}

void SplitView::registElement(QWidget *) { throw new SimpleException<bool>("非法操作", "SplitView当前不支持registElement操作"); }

void SplitView::pRelease() { throw new SimpleException<bool>("非法操作", "SplitView当前不支持pRelease操作"); }

void SplitView::pClose() { throw new SimpleException<bool>("非法操作", "SplitView当前不支持pClose操作"); }

std::pair<RectCom *, RectCom *> SplitView::child() const { return std::make_pair(child_store[0], child_store[1]); }

float SplitView::splitterWidth() const { return std::get<2>(split_info_value); }

float SplitView::splitterPos() const { return std::get<1>(split_info_value); }

SplitType SplitView::splitType() const { return std::get<0>(split_info_value); }

void SplitView::setSplitInfo(SplitType type, float pos, float width, bool relayout) {
    this->split_info_value = std::make_tuple(type, pos, width);

    if (type == SplitType::SPLIT_H)
        setCursor(Qt::CursorShape::SplitHCursor);
    else
        setCursor(Qt::CursorShape::SplitVCursor);

    if (relayout)
        this->relayout();
}

void SplitView::replaceComp(RectCom *view, RectCom *old) {
    if (!child_store.contains(old) || child_store.contains(view)) {
        throw new SimpleException<QString>("参数非法", "要替换的视图不属于本构件，或者新视图本就属于本构件");
    }

    auto index = child_store.indexOf(old);
    child_store.replace(index, view);
    view->setParentRes(this);

    viewPanel()->objsRelateRebuild();
}

QRectF SplitView::outline() const { return this->rect(); }

void SplitView::relayout(const QRectF &outlinex) {
    this->setGeometry(outlinex.toRect());
    this->relayout();
}

void SplitView::removeComp(RectCom *child_inst) {
    auto pinst = parentRes();
    auto prev_childs = child();

    prev_childs.first->setParentRes(nullptr);
    prev_childs.second->setParentRes(nullptr);
    this->child_store.clear();
    this->setParentRes(nullptr);

    auto sib = prev_childs.first;
    if (child_inst == sib)
        sib = prev_childs.second;

    static_cast<SplitView *>(pinst)->replaceComp(sib, this);
    delete this;
}

void SplitView::paintEvent(QPaintEvent *ev) {
    QWidget::paintEvent(ev);

    QPainter p(this);
    QRectF rect = handle_rect();
    p.fillRect(rect, QBrush(Qt::gray, Qt::BrushStyle::SolidPattern));

    for (auto &it : child_store) {
        it->bind()->setVisible(true);
        it->bind()->update();
    }
}

bool SplitView::contains(QWidget *) const { return false; }

QString SplitView::title() const { return ""; }

bool SplitView::canReplace() const { return true; }

void SplitView::resizeEvent(QResizeEvent *ev) {
    QWidget::resizeEvent(ev);
    relayout();
}

void SplitView::mousePressEvent(QMouseEvent *event) {
    QWidget::mousePressEvent(event);

    if (event->button() == Qt::MouseButton::LeftButton) {
        if (handle_rect().contains(event->pos()))
            drags_state = true;
    }
}

void SplitView::mouseReleaseEvent(QMouseEvent *event) {
    QWidget::mouseReleaseEvent(event);

    if (event->button() == Qt::MouseButton::LeftButton) {
        drags_state = false;
    }
}

void SplitView::mouseMoveEvent(QMouseEvent *event) {
    QWidget::mouseMoveEvent(event);

    if (drags_state) {
        auto pos = this->mapFromGlobal(event->globalPos());
        auto split_margin = splitterWidth();
        if (std::get<0>(split_info_value) == SplitType::SPLIT_H) {
            setSplitInfo(splitType(), pos.x() - split_margin / 2, split_margin, true);
        } else {
            setSplitInfo(splitType(), pos.y() - split_margin / 2, split_margin, true);
        }
        update();
    }
}

void SplitView::relayout() {
    auto rects = view_rects();
    auto pair = child();

    pair.first->relayout(std::get<0>(rects));
    pair.second->relayout(std::get<1>(rects));

    update();
}

std::pair<QRectF, QRectF> SplitView::view_rects() {
    auto xrect = this->rect();

    auto type = (int)splitType();
    if (!type) {
        auto width0 = splitterPos();
        if (width0 + splitterWidth() > xrect.width())
            width0 = xrect.width() - splitterWidth();
        if (width0 < 0)
            width0 = 0;

        setSplitInfo(splitType(), width0, splitterWidth(), false);

        auto rect0 = QRectF(xrect.topLeft(), QSizeF(width0, xrect.height()));
        auto rect1 = QRectF(xrect.topLeft() + QPointF(rect0.width() + splitterWidth(), 0),
                            QSizeF(xrect.width() - rect0.width() - splitterWidth(), xrect.height()));
        return std::make_pair(rect0, rect1);
    } else {
        auto height0 = splitterPos();
        if (height0 + splitterWidth() > xrect.height())
            height0 = xrect.height() - splitterWidth();
        if (height0 < 0)
            height0 = 0;

        setSplitInfo(splitType(), height0, splitterWidth(), false);

        auto rect0 = QRectF(xrect.topLeft(), QSizeF(xrect.width(), height0));
        auto rect1 = QRectF(xrect.topLeft() + QPointF(0, rect0.height() + splitterWidth()),
                            QSizeF(xrect.width(), xrect.height() - splitterWidth() - rect0.height()));
        return std::make_pair(rect0, rect1);
    }
}

QRectF SplitView::handle_rect() const {
    QRectF rect;

    auto width_middle = splitterWidth() - 2;
    if (splitType() == SplitType::SPLIT_H) {
        rect = QRectF(splitterPos() + 1, 0, width_middle, outline().height());
    } else {
        rect = QRectF(0, splitterPos() + 1, outline().width(), width_middle);
    }

    return rect;
}