#include "projectsettingseditor.h"
#include "ui_projectsettingseditor.h"
#include "config.h"
#include "noscrollcombobox.h"
#include "prefab.h"

#include <QAbstractButton>
#include <QFormLayout>

/*
    Editor for the settings in a user's porymap.project.cfg file (and 'use_encounter_json' in porymap.user.cfg).
*/

// TODO: Better red outline around warning section

ProjectSettingsEditor::ProjectSettingsEditor(QWidget *parent, Project *project) :
    QMainWindow(parent),
    ui(new Ui::ProjectSettingsEditor),
    project(project)
{
    ui->setupUi(this);
    setAttribute(Qt::WA_DeleteOnClose);
    this->initUi();
    this->createProjectPathsTable();
    this->connectSignals();
    this->refresh();
    this->restoreWindowState();
}

ProjectSettingsEditor::~ProjectSettingsEditor()
{
    delete ui;
}

void ProjectSettingsEditor::connectSignals() {
    connect(ui->buttonBox, &QDialogButtonBox::clicked, this, &ProjectSettingsEditor::dialogButtonClicked);
    connect(ui->button_ChoosePrefabs, &QAbstractButton::clicked, this, &ProjectSettingsEditor::choosePrefabsFileClicked);
    connect(ui->button_ImportDefaultPrefabs, &QAbstractButton::clicked, this, &ProjectSettingsEditor::importDefaultPrefabsClicked);
    connect(ui->comboBox_BaseGameVersion, &QComboBox::currentTextChanged, this, &ProjectSettingsEditor::promptRestoreDefaults);

    // Record that there are unsaved changes if any of the settings are modified
    for (auto combo : ui->centralwidget->findChildren<NoScrollComboBox *>())
        connect(combo, &QComboBox::currentTextChanged, this, &ProjectSettingsEditor::markEdited);
    for (auto checkBox : ui->centralwidget->findChildren<QCheckBox *>())
        connect(checkBox, &QCheckBox::stateChanged, this, &ProjectSettingsEditor::markEdited);
    for (auto spinBox : ui->centralwidget->findChildren<NoScrollSpinBox *>())
        connect(spinBox, QOverload<int>::of(&QSpinBox::valueChanged), [this](int) { this->markEdited(); });
    for (auto lineEdit : ui->centralwidget->findChildren<QLineEdit *>())
        connect(lineEdit, &QLineEdit::textEdited, this, &ProjectSettingsEditor::markEdited);
}

void ProjectSettingsEditor::markEdited() {
    // Don't treat signals emitted while the UI is refreshing as edits
    if (!this->refreshing)
        this->hasUnsavedChanges = true;
}

void ProjectSettingsEditor::initUi() {
    // Populate combo boxes
    if (project) ui->comboBox_DefaultPrimaryTileset->addItems(project->primaryTilesetLabels);
    if (project) ui->comboBox_DefaultSecondaryTileset->addItems(project->secondaryTilesetLabels);
    ui->comboBox_BaseGameVersion->addItems(ProjectConfig::versionStrings);
    ui->comboBox_AttributesSize->addItems({"1", "2", "4"});

    // Validate that the border metatiles text is a comma-separated list of metatile values
    const QString regex_Hex = "(0[xX])?[A-Fa-f0-9]+";
    static const QRegularExpression expression(QString("^(%1,)*%1$").arg(regex_Hex)); // Comma-separated list of hex values
    QRegularExpressionValidator *validator = new QRegularExpressionValidator(expression);
    ui->lineEdit_BorderMetatiles->setValidator(validator);

    ui->spinBox_Elevation->setMaximum(15);
    ui->spinBox_FillMetatile->setMaximum(Project::getNumMetatilesTotal() - 1);

    // TODO: These need to be subclassed (or changed to line edits) to handle larger values
    ui->spinBox_BehaviorMask->setMaximum(INT_MAX);
    ui->spinBox_EncounterTypeMask->setMaximum(INT_MAX);
    ui->spinBox_LayerTypeMask->setMaximum(INT_MAX);
    ui->spinBox_TerrainTypeMask->setMaximum(INT_MAX);
}

// TODO: Reduce vertical space between entries
// TODO: Fix vertical misalignment between label and edit area
// TODO: Add description / manual link at top?
void ProjectSettingsEditor::createProjectPathsTable() {
    auto pathPairs = ProjectConfig::defaultPaths.values();
    for (auto pathPair : pathPairs) {
        // Name of the path
        auto name = new QLabel();
        name->setText(pathPair.first);

        // Editable area of the path
        auto path = new QLineEdit();
        path->setObjectName(pathPair.first); // Used when saving the paths
        path->setPlaceholderText(pathPair.second);
        path->setClearButtonEnabled(true);
        auto button = new QToolButton();
        button->setIcon(QIcon(":/icons/folder.ico"));
        // TODO: file prompt
        //connect(button, &QAbstractButton::clicked, this, &ProjectSettingsEditor::);

        // Add to list
        auto editFrame = new QFrame();
        auto layout = new QHBoxLayout(editFrame);
        layout->addWidget(path);
        layout->addWidget(button);
        ui->layout_ProjectPaths->addRow(name, editFrame);
    }
}

void ProjectSettingsEditor::restoreWindowState() {
    logInfo("Restoring project settings editor geometry from previous session.");
    const QMap<QString, QByteArray> geometry = porymapConfig.getProjectSettingsEditorGeometry();
    this->restoreGeometry(geometry.value("project_settings_editor_geometry"));
    this->restoreState(geometry.value("project_settings_editor_state"));
}

// Set UI states using config data
void ProjectSettingsEditor::refresh() {
    this->refreshing = true; // Block signals

    // Set combo box texts
    ui->comboBox_DefaultPrimaryTileset->setTextItem(projectConfig.getDefaultPrimaryTileset());
    ui->comboBox_DefaultSecondaryTileset->setTextItem(projectConfig.getDefaultSecondaryTileset());
    ui->comboBox_BaseGameVersion->setTextItem(projectConfig.getBaseGameVersionString());
    ui->comboBox_AttributesSize->setTextItem(QString::number(projectConfig.getMetatileAttributesSize()));

    // Set check box states
    ui->checkBox_UsePoryscript->setChecked(projectConfig.getUsePoryScript());
    ui->checkBox_ShowWildEncounterTables->setChecked(userConfig.getEncounterJsonActive());
    ui->checkBox_CreateTextFile->setChecked(projectConfig.getCreateMapTextFileEnabled());
    ui->checkBox_EnableTripleLayerMetatiles->setChecked(projectConfig.getTripleLayerMetatilesEnabled());
    ui->checkBox_EnableRequiresItemfinder->setChecked(projectConfig.getHiddenItemRequiresItemfinderEnabled());
    ui->checkBox_EnableQuantity->setChecked(projectConfig.getHiddenItemQuantityEnabled());
    ui->checkBox_EnableCloneObjects->setChecked(projectConfig.getEventCloneObjectEnabled());
    ui->checkBox_EnableWeatherTriggers->setChecked(projectConfig.getEventWeatherTriggerEnabled());
    ui->checkBox_EnableSecretBases->setChecked(projectConfig.getEventSecretBaseEnabled());
    ui->checkBox_EnableRespawn->setChecked(projectConfig.getHealLocationRespawnDataEnabled());
    ui->checkBox_EnableAllowFlags->setChecked(projectConfig.getMapAllowFlagsEnabled());
    ui->checkBox_EnableFloorNumber->setChecked(projectConfig.getFloorNumberEnabled());
    ui->checkBox_EnableCustomBorderSize->setChecked(projectConfig.getUseCustomBorderSize());
    ui->checkBox_OutputCallback->setChecked(projectConfig.getTilesetsHaveCallback());
    ui->checkBox_OutputIsCompressed->setChecked(projectConfig.getTilesetsHaveIsCompressed());

    // Set spin box values
    ui->spinBox_Elevation->setValue(projectConfig.getNewMapElevation());
    ui->spinBox_FillMetatile->setValue(projectConfig.getNewMapMetatileId());
    ui->spinBox_BehaviorMask->setValue(projectConfig.getMetatileBehaviorMask());
    ui->spinBox_EncounterTypeMask->setValue(projectConfig.getMetatileEncounterTypeMask());
    ui->spinBox_LayerTypeMask->setValue(projectConfig.getMetatileLayerTypeMask());
    ui->spinBox_TerrainTypeMask->setValue(projectConfig.getMetatileTerrainTypeMask());

    // Set line edit texts
    ui->lineEdit_BorderMetatiles->setText(projectConfig.getNewMapBorderMetatileIdsString());
    ui->lineEdit_PrefabsPath->setText(projectConfig.getPrefabFilepath());
    for (auto lineEdit : ui->scrollAreaContents_ProjectPaths->findChildren<QLineEdit*>())
        lineEdit->setText(projectConfig.getFilePath(lineEdit->objectName(), false));

    this->refreshing = false; // Allow signals
}

void ProjectSettingsEditor::save() {
    if (!this->hasUnsavedChanges)
        return;

    // Prevent a call to save() for each of the config settings
    projectConfig.setSaveDisabled(true);

    projectConfig.setDefaultPrimaryTileset(ui->comboBox_DefaultPrimaryTileset->currentText());
    projectConfig.setDefaultSecondaryTileset(ui->comboBox_DefaultSecondaryTileset->currentText());
    projectConfig.setBaseGameVersion(projectConfig.stringToBaseGameVersion(ui->comboBox_BaseGameVersion->currentText()));
    projectConfig.setMetatileAttributesSize(ui->comboBox_AttributesSize->currentText().toInt());
    projectConfig.setUsePoryScript(ui->checkBox_UsePoryscript->isChecked());
    userConfig.setEncounterJsonActive(ui->checkBox_ShowWildEncounterTables->isChecked());
    projectConfig.setCreateMapTextFileEnabled(ui->checkBox_CreateTextFile->isChecked());
    projectConfig.setTripleLayerMetatilesEnabled(ui->checkBox_EnableTripleLayerMetatiles->isChecked());
    projectConfig.setHiddenItemRequiresItemfinderEnabled(ui->checkBox_EnableRequiresItemfinder->isChecked());
    projectConfig.setHiddenItemQuantityEnabled(ui->checkBox_EnableQuantity->isChecked());
    projectConfig.setEventCloneObjectEnabled(ui->checkBox_EnableCloneObjects->isChecked());
    projectConfig.setEventWeatherTriggerEnabled(ui->checkBox_EnableWeatherTriggers->isChecked());
    projectConfig.setEventSecretBaseEnabled(ui->checkBox_EnableSecretBases->isChecked());
    projectConfig.setHealLocationRespawnDataEnabled(ui->checkBox_EnableRespawn->isChecked());
    projectConfig.setMapAllowFlagsEnabled(ui->checkBox_EnableAllowFlags->isChecked());
    projectConfig.setFloorNumberEnabled(ui->checkBox_EnableFloorNumber->isChecked());
    projectConfig.setUseCustomBorderSize(ui->checkBox_EnableCustomBorderSize->isChecked());
    projectConfig.setTilesetsHaveCallback(ui->checkBox_OutputCallback->isChecked());
    projectConfig.setTilesetsHaveIsCompressed(ui->checkBox_OutputIsCompressed->isChecked());
    projectConfig.setNewMapElevation(ui->spinBox_Elevation->value());
    projectConfig.setNewMapMetatileId(ui->spinBox_FillMetatile->value());
    projectConfig.setMetatileBehaviorMask(ui->spinBox_BehaviorMask->value());
    projectConfig.setMetatileTerrainTypeMask(ui->spinBox_TerrainTypeMask->value());
    projectConfig.setMetatileEncounterTypeMask(ui->spinBox_EncounterTypeMask->value());
    projectConfig.setMetatileLayerTypeMask(ui->spinBox_LayerTypeMask->value());
    projectConfig.setPrefabFilepath(ui->lineEdit_PrefabsPath->text());
    for (auto lineEdit : ui->scrollAreaContents_ProjectPaths->findChildren<QLineEdit*>())
        projectConfig.setFilePath(lineEdit->objectName(), lineEdit->text());

    // Parse and save border metatile list
    QList<uint16_t> metatileIds;
    for (auto s : ui->lineEdit_BorderMetatiles->text().split(",")) {
        uint16_t metatileId = s.toUInt(nullptr, 0);
        metatileIds.append(qMin(metatileId, static_cast<uint16_t>(Project::getNumMetatilesTotal() - 1)));
    }
    projectConfig.setNewMapBorderMetatileIds(metatileIds);

    projectConfig.setSaveDisabled(false);
    projectConfig.save();
    this->hasUnsavedChanges = false;

    // Technically, a reload is not required for several of the config settings.
    // For simplicity we prompt the user to reload when any setting is changed regardless.
    this->projectNeedsReload = true;
}

// Pick a file to use as the new prefabs file path
void ProjectSettingsEditor::choosePrefabsFileClicked(bool) {
    QString startPath = this->project->importExportPath;
    QFileInfo fileInfo(ui->lineEdit_PrefabsPath->text());
    if (fileInfo.exists() && fileInfo.isFile() && fileInfo.suffix() == "json") {
        // Current setting is a valid JSON file. Start the file dialog there
        startPath = fileInfo.dir().absolutePath();
    }
    QString filepath = QFileDialog::getOpenFileName(this, "Choose Prefabs File", startPath, "JSON Files (*.json)");
    if (filepath.isEmpty())
        return;
    this->project->setImportExportPath(filepath);

    // Display relative path if this file is in the project folder
    const QString projectDir = projectConfig.getProjectDir() + QDir::separator();
    if (filepath.startsWith(projectDir))
        filepath.remove(0, projectDir.length());
    ui->lineEdit_PrefabsPath->setText(filepath);
    this->hasUnsavedChanges = true;
}

void ProjectSettingsEditor::importDefaultPrefabsClicked(bool) {
    // If the prompt is accepted the prefabs file will be created and its filepath will be saved in the config.
    // No need to set hasUnsavedChanges here.
    BaseGameVersion version = projectConfig.stringToBaseGameVersion(ui->comboBox_BaseGameVersion->currentText());
    if (prefab.tryImportDefaultPrefabs(this, version, ui->lineEdit_PrefabsPath->text())) {
        ui->lineEdit_PrefabsPath->setText(projectConfig.getPrefabFilepath()); // Refresh with new filepath
        this->projectNeedsReload = true;
    }
}

int ProjectSettingsEditor::prompt(const QString &text, QMessageBox::StandardButton defaultButton) {
    QMessageBox messageBox(this);
    messageBox.setText(text);
    messageBox.setIcon(QMessageBox::Question);
    messageBox.setStandardButtons(QMessageBox::Yes | QMessageBox::No | defaultButton);
    messageBox.setDefaultButton(defaultButton);
    return messageBox.exec();
}

bool ProjectSettingsEditor::promptSaveChanges() {
    if (!this->hasUnsavedChanges)
        return true;

    int result = this->prompt("Settings have been modified, save changes?", QMessageBox::Cancel);
    if (result == QMessageBox::Cancel)
        return false;

    if (result == QMessageBox::Yes)
        this->save();
    else if (result == QMessageBox::No)
        this->hasUnsavedChanges = false; // Discarding changes

    return true;
}

bool ProjectSettingsEditor::promptRestoreDefaults() {
    if (this->refreshing)
        return false;

    const QString versionText = ui->comboBox_BaseGameVersion->currentText();
    if (this->prompt(QString("Restore default config settings for %1?").arg(versionText)) == QMessageBox::No)
        return false;

    // Restore defaults by resetting config in memory, refreshing the UI, then restoring the config.
    // Don't want to save changes until user accepts them.
    ProjectConfig tempProject = projectConfig;
    projectConfig.reset(projectConfig.stringToBaseGameVersion(versionText));
    this->refresh();
    projectConfig = tempProject;

    this->hasUnsavedChanges = true;
    return true;
}

void ProjectSettingsEditor::dialogButtonClicked(QAbstractButton *button) {
    auto buttonRole = ui->buttonBox->buttonRole(button);
    if (buttonRole == QDialogButtonBox::AcceptRole) {
        // "OK" button
        this->save();
        close();
    } else if (buttonRole == QDialogButtonBox::RejectRole) {
        // "Cancel" button
        if (!this->promptSaveChanges())
            return;
        close();
    } else if (buttonRole == QDialogButtonBox::ResetRole) {
        // "Restore Defaults" button
        this->promptRestoreDefaults();
    }
}

void ProjectSettingsEditor::closeEvent(QCloseEvent* event) {
    if (!this->promptSaveChanges()) {
        event->ignore();
        return;
    }

    if (this->projectNeedsReload) {
        if (this->prompt("Settings changed, reload project to apply changes?") == QMessageBox::Yes)
            emit this->reloadProject();
    }

    porymapConfig.setProjectSettingsEditorGeometry(
        this->saveGeometry(),
        this->saveState()
    );
}