/*
* All or portions of this file Copyright (c) Amazon.com, Inc. or its affiliates or
* its licensors.
*
* For complete copyright and license terms please see the LICENSE at the root of this
* distribution (the "License"). All use of this software is governed by the License,
* or, if provided, by the license below or the license accompanying this file. Do not
* remove or modify any license notices. This file is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
*
*/

#include <Material/EditorMaterialComponentExporter.h>
#include <AzFramework/API/ApplicationAPI.h>
#include <AzToolsFramework/API/EditorAssetSystemAPI.h>
#include <AzToolsFramework/API/ToolsApplicationAPI.h>
#include <Atom/RPI.Edit/Common/AssetUtils.h>
#include <Atom/RPI.Edit/Common/JsonUtils.h>
#include <Atom/RPI.Edit/Material/MaterialPropertyId.h>
#include <Atom/RPI.Edit/Material/MaterialSourceData.h>
#include <Atom/RPI.Edit/Material/MaterialTypeSourceData.h>
#include <Atom/RPI.Edit/Material/MaterialUtils.h>
#include <Atom/RPI.Reflect/Material/MaterialAsset.h>
#include <Atom/RPI.Reflect/Material/MaterialPropertiesLayout.h>
#include <Atom/RPI.Reflect/Material/MaterialTypeAsset.h>
#include <AzQtComponents/Components/Widgets/BrowseEdit.h>

#include <AzToolsFramework/API/EditorWindowRequestBus.h>

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

            // Returns message text based on the item state
            QString GetExportItemStatusMessage(const ExportItem& exportItem)
            {
                QFileInfo fileInfo(exportItem.m_exportPath.c_str());
                if (!exportItem.m_enabled)
                {
                    return QString("Do not generate a new material.");
                }

                if (fileInfo == QFileInfo())
                {
                    return QString("A valid material file path is required.");
                }

                if (fileInfo.exists())
                {
                    return QString("\"%1\" will be replaced in the designated folder.").arg(fileInfo.fileName());
                }

                return QString("\"%1\" will be generated in the designated folder.").arg(fileInfo.fileName());
            }

            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 Source Materials");

                const QStringList headerLabels = { "Enable", "Material Slot", "Material Filename", "Status" };
                const int EnableColumn = 0;
                const int MaterialColumn = 1;
                const int FileColumn = 2;
                const int StatusColumn = 3;

                // 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(QHeaderView::ResizeToContents);
                tableWidget->horizontalHeader()->setStretchLastSection(true);

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

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

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

                    // Populate the table with data for every column
                    tableWidget->setItem(row, EnableColumn, new QTableWidgetItem(exportItem.m_enabled));
                    tableWidget->setItem(row, MaterialColumn, new QTableWidgetItem(GetLabelByAssetId(exportItem.m_assetId).c_str()));
                    tableWidget->setItem(row, FileColumn, new QTableWidgetItem(fileInfo.fileName()));

                    // Create a check box for toggling the enabled state of this item
                    QWidget* enableCheckBoxParent = new QWidget(tableWidget);
                    QCheckBox* enableCheckBox = new QCheckBox(enableCheckBoxParent);
                    enableCheckBox->setChecked(exportItem.m_enabled);

                    // Center checkbox in cell
                    QHBoxLayout* enableCheckBoxLayout = new QHBoxLayout(enableCheckBoxParent);
                    enableCheckBoxLayout->setAlignment(Qt::AlignCenter);
                    enableCheckBoxLayout->addWidget(enableCheckBox);
                    enableCheckBoxParent->setLayout(enableCheckBoxLayout);

                    tableWidget->setCellWidget(row, EnableColumn, enableCheckBoxParent);

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

                    // The status widget will be used to inform the user of issues and outcomes from selected settings
                    QLabel* statusWidget = new QLabel(tableWidget);
                    statusWidget->setText(GetExportItemStatusMessage(exportItem));
                    tableWidget->setCellWidget(row, StatusColumn, statusWidget);

                    // Whenever the selection is updated, automatically apply the change to the export item
                    QObject::connect(enableCheckBox, &QCheckBox::stateChanged, enableCheckBox, [&dialog, &exportItem, enableCheckBox, fileWidget, statusWidget]([[maybe_unused]] int state) {
                        exportItem.m_enabled = enableCheckBox->isChecked();
                        fileWidget->setEnabled(exportItem.m_enabled);
                        statusWidget->setText(GetExportItemStatusMessage(exportItem));
                    });

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

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

                            // Update the controls to display the new state
                            fileWidget->setText(fileInfo.fileName());
                            statusWidget->setText(GetExportItemStatusMessage(exportItem));
                        }
                    });

                    ++row;
                }

                tableWidget->sortItems(MaterialColumn);

                // Create the bottom row of the dialog with action buttons for exporting or canceling the operation
                QWidget* buttonRow = new QWidget(&dialog);
                buttonRow->setSizePolicy(QSizePolicy::MinimumExpanding, QSizePolicy::Preferred);

                QPushButton* confirmButton = new QPushButton("Confirm", buttonRow);
                QObject::connect(confirmButton, &QPushButton::clicked, confirmButton, [&dialog] { dialog.accept(); });

                QPushButton* cancelButton = new QPushButton("Cancel", buttonRow);
                QObject::connect(cancelButton, &QPushButton::clicked, cancelButton, [&dialog] { dialog.reject(); });

                QHBoxLayout* buttonLayout = new QHBoxLayout(buttonRow);
                buttonLayout->addStretch();
                buttonLayout->addWidget(confirmButton);
                buttonLayout->addWidget(cancelButton);

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

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

                // 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(1000, 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;
                }

                // Load the originating product asset from which the new source has set will be generated
                auto materialAssetOutcome = AZ::RPI::AssetUtils::LoadAsset<AZ::RPI::MaterialAsset>(exportItem.m_assetId);
                if (!materialAssetOutcome)
                {
                    AZ_Error("AZ::Render::EditorMaterialComponentExporter", false, "Failed to load initial material asset while attempting to export: %s", exportItem.m_exportPath.c_str());
                    return false;
                }

                AZ::Data::Asset<AZ::RPI::MaterialAsset> materialAsset = materialAssetOutcome.GetValue();
                AZ::Data::Asset<AZ::RPI::MaterialTypeAsset> materialTypeAsset = materialAsset->GetMaterialTypeAsset();

                // We need a valid path to the material type source data because it's required for to get the property layout and assign to the new material
                const AZStd::string& materialTypePath = AZ::RPI::AssetUtils::GetSourcePathByAssetId(materialTypeAsset.GetId());
                if (materialTypePath.empty())
                {
                    AZ_Error("AZ::Render::EditorMaterialComponentExporter", false, "Failed to locate source material type asset while attempting to export: %s", exportItem.m_exportPath.c_str());
                    return false;
                }

                // Getting the source info for the material type file to make sure that it exists
                // We also need to watch folder to generate a relative asset path for the material type
                bool result = false;
                AZ::Data::AssetInfo info;
                AZStd::string watchFolder;
                AzToolsFramework::AssetSystemRequestBus::BroadcastResult(result, &AzToolsFramework::AssetSystemRequestBus::Events::GetSourceInfoBySourcePath, materialTypePath.c_str(), info, watchFolder);
                if (!result)
                {
                    AZ_Error("AZ::Render::EditorMaterialComponentExporter", false, "Failed to get source file info and asset path while attempting to export: %s", exportItem.m_exportPath.c_str());
                    return false;
                }

                // At this point, we should be ready to attempt to load the material type data
                auto materialTypeOutcome = AZ::RPI::MaterialUtils::LoadMaterialTypeSourceData(materialTypePath);
                if (!materialTypeOutcome.IsSuccess())
                {
                    AZ_Error("AZ::Render::EditorMaterialComponentExporter", false, "Failed to load material type source data: %s", materialTypePath.c_str());
                    return false;
                }
                AZ::RPI::MaterialTypeSourceData materialTypeSourceData = materialTypeOutcome.GetValue();

                // Construct the material source data object that will be exported
                AZ::RPI::MaterialSourceData exportData;
                exportData.m_propertyLayoutVersion = materialTypeSourceData.m_propertyLayout.m_version;

                // Converting the absolute material type app to an asset relative path
                exportData.m_materialType = materialTypePath;
                AzFramework::ApplicationRequests::Bus::Broadcast(&AzFramework::ApplicationRequests::Bus::Events::MakePathRelative, exportData.m_materialType, watchFolder.c_str());

                // Copy all of the properties from the material asset to the source data that will be exported
                result = true;
                materialTypeSourceData.EnumerateProperties([&materialAsset, &materialTypeSourceData, &exportData, &exportItem, &result](const AZStd::string& groupNameId, const AZStd::string& propertyNameId, const auto& propertyDefinition) {
                    const AZ::RPI::MaterialPropertyId propertyId(groupNameId, propertyNameId);
                    const AZ::RPI::MaterialPropertyIndex propertyIndex = materialAsset->GetMaterialPropertiesLayout()->FindPropertyIndex(propertyId.GetFullName());
                    AZ::RPI::MaterialPropertyValue propertyValue = materialAsset->GetPropertyValues()[propertyIndex.GetIndex()];

                    if (!materialTypeSourceData.ConvertPropertyValueToSourceDataFormat(propertyDefinition, propertyValue))
                    {
                        AZ_Error("AZ::Render::EditorMaterialComponentExporter", false, "Failed to export: %s", exportItem.m_exportPath.c_str());
                        result = false;
                        return false;
                    }

                    if (propertyDefinition.m_value == propertyValue)
                    {
                        return true;
                    }

                    exportData.m_properties[groupNameId][propertyDefinition.m_nameId].m_value = propertyValue;
                    return true;
                });

                return result && AZ::RPI::JsonUtils::SaveObjectToFile(exportItem.m_exportPath, exportData);
            }
        } // namespace EditorMaterialComponentExporter
    } // namespace Render
} // namespace AZ