#include "SequenceView.h"
#include <QSpinBox>
#include <QJsonDocument>
#include <QJsonObject>

IntDelegate::IntDelegate(int min, int max)
	: _min_value(min), _max_value(max) {
}

QWidget* IntDelegate::createEditor(QWidget* parent, const QStyleOptionViewItem& option, const QModelIndex& index) const
{
	return new QSpinBox(parent);
}

void IntDelegate::setEditorData(QWidget* editor, const QModelIndex& index) const
{
	auto spin = dynamic_cast<QSpinBox*>(editor);
	spin->setRange(_min_value, _max_value);
	spin->setValue(index.data(Qt::DisplayRole).toInt());
}

void IntDelegate::setModelData(QWidget* editor, QAbstractItemModel* model, const QModelIndex& index) const
{
	auto value = dynamic_cast<QSpinBox*>(editor);
	model->setData(index, value->value(), Qt::EditRole);

	emit this->valueChanged(index);
}

void IntDelegate::updateEditorGeometry(QWidget* editor, const QStyleOptionViewItem& option, const QModelIndex& index) const
{
	editor->setGeometry(option.rect);
}

#include "TranslateBasic.h"
void SequenceView::tidyRuleAt(const QModelIndex& idx)
{
	auto rule_idx = idx.sibling(idx.row(), 3);
	auto rule_nm = base->extactors()[rule_idx.data(Qt::DisplayRole).toString()];
	auto new_inst = std::dynamic_pointer_cast<ExtractUnit>(rule_nm->newDefault());
	_rule_sequence.replace(idx.row(), new_inst);

	auto offset_index = idx.sibling(idx.row(), 1);
	auto offset_number = offset_index.data(Qt::DisplayRole).toInt();
	auto count_index = idx.sibling(idx.row(), 2);
	auto count_number = count_index.data(Qt::DisplayRole).toInt();
	auto rule_insv = std::dynamic_pointer_cast<AbstractExtractor>(new_inst);

	if (rule_insv) {
		rule_insv->setOffsetFromPrevious(offset_number);
		rule_insv->setCountWithinParse(count_number);
	}

	_sequence_model->setData(offset_index, new_inst->offsetFromPrevious(), Qt::EditRole);
	_sequence_model->setData(count_index, new_inst->countWithinParse(), Qt::EditRole);

	auto param_index = idx.sibling(idx.row(), 4);
	QJsonObject obj;
	rule_insv->saveTo(obj);
	auto bytes = QJsonDocument(obj).toJson(QJsonDocument::Compact);
	_sequence_model->setData(param_index, QString::fromUtf8(bytes));

	this->resizeColumnsToContents();
}

#include <QItemSelectionModel>
SequenceView::SequenceView(QWidget* p /*= nullptr*/)
	:QTableView(p),
	_sequence_model(new QStandardItemModel),
	base(std::make_shared<TranslateBasic>())
{
	this->setModel(_sequence_model);
	_sequence_model->setHorizontalHeaderLabels(QStringList()
		<< tr(u8"Field Name") << tr(u8"Bytes Offset") << tr(u8"Bytes Count")
		<< tr(u8"Translate Rule") << tr(u8"Arguments"));

	auto int_delegate = new IntDelegate(0, INT_MAX);
	this->setItemDelegateForColumn(1, int_delegate);
	this->setItemDelegateForColumn(2, int_delegate);
	auto rule_delegate = new RuleSelectDelegate(base);
	this->setItemDelegateForColumn(3, rule_delegate);

	this->setContextMenuPolicy(Qt::CustomContextMenu);
	connect(this, &QTableView::customContextMenuRequested, this, &SequenceView::customTranslateRuleEdit);
	connect(rule_delegate, &RuleSelectDelegate::dataChanged, this, &SequenceView::tidyRuleAt);
	connect(int_delegate, &IntDelegate::valueChanged, this, &SequenceView::tidyRuleAt);

	auto select_model = this->selectionModel();
	connect(select_model, &QItemSelectionModel::currentRowChanged, [=](const QModelIndex& curr) {
		if (!curr.isValid())
			return;

		emit this->currentRuleChanged(_rule_sequence[curr.row()]); });
}

#include <QMenu>
void SequenceView::customTranslateRuleEdit(const QPoint& pos)
{
	QMenu immediate;
	immediate.addAction(u8"Add Unit", this, &SequenceView::addTranslateUnit);
	immediate.addAction(u8"Remove Unit", this, &SequenceView::removeTranslateUnit);
	immediate.exec(this->mapToGlobal(pos));
}

void SequenceView::addTranslateUnit()
{
	auto row_cnt = this->_sequence_model->rowCount();

	QList<QStandardItem*> new_row;
	new_row << new QStandardItem(QString(u8"rule_%1").arg(row_cnt));
	new_row << new QStandardItem(u8"0");
	new_row << new QStandardItem(u8"1");
	new_row << new QStandardItem(base->defaultRule()->name());

	auto curr_rule = base->defaultRule()->newDefault();
	this->_rule_sequence << std::static_pointer_cast<AbstractExtractor>(curr_rule);

	auto hex_rule = std::static_pointer_cast<BytesAsHex>(curr_rule);
	hex_rule->setCountWithinParse(1);

	QJsonObject  obj;
	curr_rule->saveTo(obj);
	auto bytes = QJsonDocument(obj).toJson(QJsonDocument::Compact);
	auto json_doc = QString::fromUtf8(bytes);
	new_row << new QStandardItem(json_doc);

	this->_sequence_model->appendRow(new_row);
	this->resizeColumnsToContents();
}

void SequenceView::removeTranslateUnit()
{
	auto idx_curr = this->currentIndex();
	if (!idx_curr.isValid())
		return;

	_rule_sequence.removeAt(idx_curr.row());
	_sequence_model->removeRow(idx_curr.row());
}

TranslateBasic::TranslateBasic()
{
	std::shared_ptr<ExtractUnit> u_ptr = std::make_shared<BytesAsBitCombine>();
	_extractor_types[u_ptr->name()] = u_ptr;

	u_ptr = std::make_shared<BytesAsInteger>();
	_extractor_types[u_ptr->name()] = u_ptr;

	u_ptr = std::make_shared<BytesAsString>();
	_extractor_types[u_ptr->name()] = u_ptr;

	u_ptr = std::make_shared<BytesAsHex>();
	_extractor_types[u_ptr->name()] = u_ptr;
	this->_default_translate_rule = u_ptr;
}

std::shared_ptr<ExtractUnit> TranslateBasic::defaultRule() const
{
	return _default_translate_rule;
}

QHash<QString, std::shared_ptr<ExtractUnit>> TranslateBasic::extactors() const
{
	return _extractor_types;
}

RuleSelectDelegate::RuleSelectDelegate(std::shared_ptr<TranslateBasic> ins)
	:_kernel(ins) {
}

#include <QComboBox>
QWidget* RuleSelectDelegate::createEditor(QWidget* parent, const QStyleOptionViewItem& option, const QModelIndex& index) const
{
	return new QComboBox(parent);
}

void RuleSelectDelegate::setEditorData(QWidget* editor, const QModelIndex& index) const
{
	auto rule_names = this->_kernel->extactors().keys();
	std::sort(rule_names.begin(), rule_names.end());

	auto combo = dynamic_cast<QComboBox*>(editor);
	combo->addItems(rule_names);
	combo->setCurrentText(index.data(Qt::DisplayRole).toString());
}

void RuleSelectDelegate::setModelData(QWidget* editor, QAbstractItemModel* model, const QModelIndex& index) const
{
	auto rule_name = dynamic_cast<QComboBox*>(editor)->currentText();
	model->setData(index, rule_name, Qt::EditRole);

	emit this->dataChanged(index);
}

void RuleSelectDelegate::updateEditorGeometry(QWidget* editor, const QStyleOptionViewItem& option, const QModelIndex& index) const
{
	editor->setGeometry(option.rect);
}