/*
 * Copyright (c) Contributors to the Open 3D Engine Project.
 * For complete copyright and license terms please see the LICENSE at the root of this distribution.
 *
 * SPDX-License-Identifier: Apache-2.0 OR MIT
 *
 */

#include <Material/EditorMaterialComponentExporter.h>
#include <Material/EditorMaterialComponentUtil.h>

#include <AzFramework/API/ApplicationAPI.h>
#include <AzQtComponents/Components/Widgets/BrowseEdit.h>
#include <AzToolsFramework/API/EditorAssetSystemAPI.h>
#include <AzToolsFramework/API/EditorWindowRequestBus.h>
#include <AzToolsFramework/API/ToolsApplicationAPI.h>

#include <Atom/RPI.Edit/Common/AssetUtils.h>

AZ_PUSH_DISABLE_WARNING(4251 4800, "-Wunknown-warning-option") // disable warnings spawned by QT
#include <QApplication>
#include <QCheckBox>
#include <QComboBox>
#include <QDialogButtonBox>
#include <QFileDialog>
#include <QHBoxLayout>
#include <QHeaderView>
#include <QLabel>
#include <QPushButton>
#include <QTableWidget>
#include <QVBoxLayout>
AZ_POP_DISABLE_WARNING

namespace AZ
{
    namespace Render
    {
        namespace EditorMaterialComponentExporter
        {
            AZStd::string GetLabelByAssetId(const AZ::Data::AssetId& assetId)
            {
                AZStd::string label;
                if (assetId.IsValid())
                {
                    // Material assets that are exported through the scene pipeline have their filenames generated by adding
                    // the DCC material name as a prefix and a unique number to the end of the source file name.
                    // Rather than storing the DCC material name inside of the material asset we can reproduce it by removing
                    // the prefix and suffix from the product file name.

                    // We need the material product path as the initial string that will be stripped down
                    const AZStd::string& productPath = AZ::RPI::AssetUtils::GetProductPathByAssetId(assetId);
                    if (!productPath.empty() && AzFramework::StringFunc::Path::GetFileName(productPath.c_str(), label))
                    {
                        // If there is a source file, typically an FBX or other model file, we must get its filename to remove the prefix from the label
                        AZStd::string prefix;
                        const AZStd::string& sourcePath = AZ::RPI::AssetUtils::GetSourcePathByAssetId(assetId);
                        if (!sourcePath.empty() && AZ::StringFunc::Path::GetFileName(sourcePath.c_str(), prefix))
                        {
                            if (!prefix.empty() && prefix.size() < label.size())
                            {
                                if (AZ::StringFunc::StartsWith(label, prefix, false))
                                {
                                    // All of the product filename's tokens are separated by underscores so we must also remove the first underscore after the prefix
                                    label = label.substr(prefix.size() + 1);
                                }
                            }
                        }

                        // We can remove the numeric suffix by stripping the label of everything after the last underscore
                        const auto iter = label.find_last_of("_");
                        if (iter != AZStd::string::npos)
                        {
                            label = label.substr(0, iter);
                        }
                    }
                }
                return label;
            }

            AZStd::string GetExportPathByAssetId(const AZ::Data::AssetId& assetId)
            {
                AZStd::string exportPath;
                if (assetId.IsValid())
                {
                    exportPath = AZ::RPI::AssetUtils::GetSourcePathByAssetId(assetId);
                    AZ::StringFunc::Path::StripExtension(exportPath);
                    exportPath += "_";
                    exportPath += GetLabelByAssetId(assetId);
                    exportPath += ".";
                    exportPath += AZ::RPI::MaterialSourceData::Extension;
                    AZ::StringFunc::Path::Normalize(exportPath);
                }
                return exportPath;
            }

            bool OpenExportDialog(ExportItemsContainer& exportItems)
            {
                QWidget* activeWindow = nullptr;
                AzToolsFramework::EditorWindowRequestBus::BroadcastResult(activeWindow, &AzToolsFramework::EditorWindowRequests::GetAppMainWindow);

                // Constructing a dialog with a table to display all configurable material export items
                QDialog dialog(activeWindow);
                dialog.setWindowTitle("Generate/Manage Source Materials");

                const QStringList headerLabels = { "Material Slot", "Material Filename", "Overwrite" };
                const int MaterialSlotColumn = 0;
                const int MaterialFileColumn = 1;
                const int OverwriteFileColumn = 2;

                // Create a table widget that will be filled with all of the data and options for each exported material
                QTableWidget* tableWidget = new QTableWidget(&dialog);
                tableWidget->setColumnCount(headerLabels.size());
                tableWidget->setRowCount((int)exportItems.size());
                tableWidget->setHorizontalHeaderLabels(headerLabels);
                tableWidget->setSortingEnabled(false);
                tableWidget->setAlternatingRowColors(true);
                tableWidget->setCornerButtonEnabled(false);
                tableWidget->setContextMenuPolicy(Qt::DefaultContextMenu);
                tableWidget->setSelectionBehavior(QAbstractItemView::SelectRows);
                tableWidget->setSelectionMode(QAbstractItemView::SingleSelection);
                tableWidget->setSizePolicy(QSizePolicy::MinimumExpanding, QSizePolicy::MinimumExpanding);

                // Force the table to stretch its header to fill the entire width of the dialog
                tableWidget->horizontalHeader()->setSectionResizeMode(MaterialSlotColumn, QHeaderView::ResizeToContents);
                tableWidget->horizontalHeader()->setSectionResizeMode(MaterialFileColumn, QHeaderView::Stretch);
                tableWidget->horizontalHeader()->setSectionResizeMode(OverwriteFileColumn, QHeaderView::ResizeToContents);
                tableWidget->horizontalHeader()->setStretchLastSection(false);

                // Hide row numbers
                tableWidget->verticalHeader()->setVisible(false);

                int row = 0;
                for (ExportItem& exportItem : exportItems)
                {
                    QFileInfo fileInfo(GetExportPathByAssetId(exportItem.m_originalAssetId).c_str());

                    // Configuring initial settings based on whether or not the target file already exists
                    exportItem.m_exportPath = fileInfo.absoluteFilePath().toUtf8().constData();
                    exportItem.m_exists = fileInfo.exists();
                    exportItem.m_overwrite = false;

                    // Populate the table with data for every column
                    tableWidget->setItem(row, MaterialSlotColumn, new QTableWidgetItem());
                    tableWidget->setItem(row, MaterialFileColumn, new QTableWidgetItem());
                    tableWidget->setItem(row, OverwriteFileColumn, new QTableWidgetItem());

                    // Create a check box for toggling the enabled state of this item
                    QCheckBox* materialSlotCheckBox = new QCheckBox(tableWidget);
                    materialSlotCheckBox->setChecked(exportItem.m_enabled);
                    materialSlotCheckBox->setText(GetLabelByAssetId(exportItem.m_originalAssetId).c_str());
                    tableWidget->setCellWidget(row, MaterialSlotColumn, materialSlotCheckBox);

                    // Create a file picker widget for selecting the save path for the exported material
                    AzQtComponents::BrowseEdit* materialFileWidget = new AzQtComponents::BrowseEdit(tableWidget);
                    materialFileWidget->setLineEditReadOnly(true);
                    materialFileWidget->setClearButtonEnabled(false);
                    materialFileWidget->setEnabled(exportItem.m_enabled);
                    materialFileWidget->setText(fileInfo.fileName());
                    tableWidget->setCellWidget(row, MaterialFileColumn, materialFileWidget);

                    // Create a check box for toggling the overwrite state of this item
                    QWidget* overwriteCheckBoxContainer = new QWidget(tableWidget);
                    QCheckBox* overwriteCheckBox = new QCheckBox(overwriteCheckBoxContainer);
                    overwriteCheckBox->setChecked(exportItem.m_overwrite);
                    overwriteCheckBox->setEnabled(exportItem.m_enabled && exportItem.m_exists);

                    overwriteCheckBoxContainer->setLayout(new QHBoxLayout(overwriteCheckBoxContainer));
                    overwriteCheckBoxContainer->layout()->addWidget(overwriteCheckBox);
                    overwriteCheckBoxContainer->layout()->setAlignment(Qt::AlignCenter);
                    overwriteCheckBoxContainer->layout()->setContentsMargins(0, 0, 0, 0);

                    tableWidget->setCellWidget(row, OverwriteFileColumn, overwriteCheckBoxContainer);

                    // Whenever the selection is updated, automatically apply the change to the export item
                    QObject::connect(materialSlotCheckBox, &QCheckBox::stateChanged, materialSlotCheckBox, [&exportItem, materialFileWidget, materialSlotCheckBox, overwriteCheckBox]([[maybe_unused]] int state) {
                        exportItem.m_enabled = materialSlotCheckBox->isChecked();
                        materialFileWidget->setEnabled(exportItem.m_enabled);
                        overwriteCheckBox->setEnabled(exportItem.m_enabled && exportItem.m_exists);
                    });

                    // Whenever the overwrite check box is updated, automatically apply the change to the export item
                    QObject::connect(overwriteCheckBox, &QCheckBox::stateChanged, overwriteCheckBox, [&exportItem, overwriteCheckBox]([[maybe_unused]] int state) {
                        exportItem.m_overwrite = overwriteCheckBox->isChecked();
                    });

                    // Whenever the browse button is clicked, open a save file dialog in the same location as the current export file setting
                    QObject::connect(materialFileWidget, &AzQtComponents::BrowseEdit::attachedButtonTriggered, materialFileWidget, [&dialog, &exportItem, materialFileWidget, overwriteCheckBox]() {
                        QFileInfo fileInfo = QFileDialog::getSaveFileName(&dialog,
                            QString("Select Material Filename"),
                            exportItem.m_exportPath.c_str(),
                            QString("Material (*.material)"),
                            nullptr,
                            QFileDialog::DontConfirmOverwrite);

                        // Only update the export data if a valid path and filename was selected
                        if (!fileInfo.absoluteFilePath().isEmpty())
                        {
                            exportItem.m_exportPath = fileInfo.absoluteFilePath().toUtf8().constData();
                            exportItem.m_exists = fileInfo.exists();
                            exportItem.m_overwrite = fileInfo.exists();

                            // Update the controls to display the new state
                            materialFileWidget->setText(fileInfo.fileName());
                            overwriteCheckBox->setChecked(exportItem.m_overwrite);
                            overwriteCheckBox->setEnabled(exportItem.m_enabled && exportItem.m_exists);
                        }
                    });

                    ++row;
                }

                tableWidget->sortItems(MaterialSlotColumn);

                // Create the bottom row of the dialog with action buttons for exporting or canceling the operation
                QDialogButtonBox* buttonBox = new QDialogButtonBox(&dialog);
                buttonBox->setStandardButtons(QDialogButtonBox::Cancel | QDialogButtonBox::Ok);
                QObject::connect(buttonBox, &QDialogButtonBox::accepted, &dialog, &QDialog::accept);
                QObject::connect(buttonBox, &QDialogButtonBox::rejected, &dialog, &QDialog::reject);

                // Create a heading label for the top of the dialog
                QLabel* labelWidget = new QLabel("\nSelect the material slots that you want to generate new source materials for. Edit the material file name and location using the file picker.\n", &dialog);
                labelWidget->setWordWrap(true);

                QVBoxLayout* dialogLayout = new QVBoxLayout(&dialog);
                dialogLayout->addWidget(labelWidget);
                dialogLayout->addWidget(tableWidget);
                dialogLayout->addWidget(buttonBox);
                dialog.setLayout(dialogLayout);
                dialog.setModal(true);

                // Forcing the initial dialog size to accomodate typical content.
                // Temporarily settng fixed size because dialog.show/exec invokes WindowDecorationWrapper::showEvent.
                // This forces the dialog to be centered and sized based on the layout of content.
                // Resizing the dialog after show will not be centered and moving the dialog programatically doesn't m0ve the custmk frame. 
                dialog.setFixedSize(500, 200);
                dialog.show();

                // Removing fixed size to allow drag resizing
                dialog.setMinimumSize(0, 0);
                dialog.setMaximumSize(QWIDGETSIZE_MAX, QWIDGETSIZE_MAX);

                // Return true if the user press the export button
                return dialog.exec() == QDialog::Accepted;
            }

            bool ExportMaterialSourceData(const ExportItem& exportItem)
            {
                if (!exportItem.m_enabled || exportItem.m_exportPath.empty())
                {
                    return false;
                }

                if (exportItem.m_exists && !exportItem.m_overwrite)
                {
                    return true;
                }

                EditorMaterialComponentUtil::MaterialEditData editData;
                if (!EditorMaterialComponentUtil::LoadMaterialEditDataFromAssetId(exportItem.m_originalAssetId, editData))
                {
                    AZ_Warning("AZ::Render::EditorMaterialComponentExporter", false, "Failed to load material data.");
                    return false;
                }

                if (!EditorMaterialComponentUtil::SaveSourceMaterialFromEditData(exportItem.m_exportPath, editData))
                {
                    AZ_Warning("AZ::Render::EditorMaterialComponentExporter", false, "Failed to save material data.");
                    return false;
                }

                return true;
            }
        } // namespace EditorMaterialComponentExporter
    } // namespace Render
} // namespace AZ