// Copyright 2016 Citra Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.

#include <QColorDialog>
#ifdef __APPLE__
#include <QMessageBox>
#endif
#include "citra_qt/configuration/configure_graphics.h"
#include "core/core.h"
#include "core/settings.h"
#include "ui_configure_graphics.h"
#include "video_core/renderer_opengl/post_processing_opengl.h"

ConfigureGraphics::ConfigureGraphics(QWidget* parent)
    : QWidget(parent), ui(new Ui::ConfigureGraphics) {
    ui->setupUi(this);
    SetConfiguration();

    ui->layoutBox->setEnabled(!Settings::values.custom_layout);

    ui->hw_renderer_group->setEnabled(ui->toggle_hw_renderer->isChecked());
    connect(ui->toggle_hw_renderer, &QCheckBox::toggled, ui->hw_renderer_group,
            &QWidget::setEnabled);
    ui->hw_shader_group->setEnabled(ui->toggle_hw_shader->isChecked());
    connect(ui->toggle_hw_shader, &QCheckBox::toggled, ui->hw_shader_group, &QWidget::setEnabled);
#ifdef __APPLE__
    connect(ui->toggle_hw_shader, &QCheckBox::stateChanged, this, [this](int state) {
        if (state == Qt::Checked) {
            QMessageBox::warning(
                this, tr("Hardware Shader Warning"),
                tr("Hardware Shader support is broken on macOS, and will cause graphical issues "
                   "like showing a black screen.<br><br>The option is only there for "
                   "test/development purposes. If you experience graphical issues with Hardware "
                   "Shader, please turn it off."));
        }
    });
#endif

    connect(ui->render_3d_combobox,
            static_cast<void (QComboBox::*)(int)>(&QComboBox::currentIndexChanged), this,
            [this](int currentIndex) {
                updateShaders(static_cast<Settings::StereoRenderOption>(currentIndex) ==
                              Settings::StereoRenderOption::Anaglyph);
            });

    connect(ui->bg_button, &QPushButton::clicked, this, [this] {
        const QColor new_bg_color = QColorDialog::getColor(bg_color);
        if (!new_bg_color.isValid()) {
            return;
        }
        UpdateBackgroundColorButton(new_bg_color);
    });
}

ConfigureGraphics::~ConfigureGraphics() = default;

void ConfigureGraphics::SetConfiguration() {
    ui->toggle_hw_renderer->setChecked(Settings::values.use_hw_renderer);
    ui->toggle_hw_shader->setChecked(Settings::values.use_hw_shader);
    ui->toggle_accurate_mul->setChecked(Settings::values.shaders_accurate_mul);
    ui->toggle_shader_jit->setChecked(Settings::values.use_shader_jit);
    ui->resolution_factor_combobox->setCurrentIndex(Settings::values.resolution_factor);
    ui->render_3d_combobox->setCurrentIndex(static_cast<int>(Settings::values.render_3d));
    ui->factor_3d->setValue(Settings::values.factor_3d);
    updateShaders(Settings::values.render_3d == Settings::StereoRenderOption::Anaglyph);
    ui->toggle_linear_filter->setChecked(Settings::values.filter_mode);
    ui->layout_combobox->setCurrentIndex(static_cast<int>(Settings::values.layout_option));
    ui->swap_screen->setChecked(Settings::values.swap_screen);
    UpdateBackgroundColorButton(QColor::fromRgbF(Settings::values.bg_red, Settings::values.bg_green,
                                                 Settings::values.bg_blue));
}

void ConfigureGraphics::ApplyConfiguration() {
    Settings::values.use_hw_renderer = ui->toggle_hw_renderer->isChecked();
    Settings::values.use_hw_shader = ui->toggle_hw_shader->isChecked();
    Settings::values.shaders_accurate_mul = ui->toggle_accurate_mul->isChecked();
    Settings::values.use_shader_jit = ui->toggle_shader_jit->isChecked();
    Settings::values.resolution_factor =
        static_cast<u16>(ui->resolution_factor_combobox->currentIndex());
    Settings::values.render_3d =
        static_cast<Settings::StereoRenderOption>(ui->render_3d_combobox->currentIndex());
    Settings::values.factor_3d = ui->factor_3d->value();
    Settings::values.pp_shader_name =
        ui->shader_combobox->itemText(ui->shader_combobox->currentIndex()).toStdString();
    Settings::values.filter_mode = ui->toggle_linear_filter->isChecked();
    Settings::values.layout_option =
        static_cast<Settings::LayoutOption>(ui->layout_combobox->currentIndex());
    Settings::values.swap_screen = ui->swap_screen->isChecked();
    Settings::values.bg_red = static_cast<float>(bg_color.redF());
    Settings::values.bg_green = static_cast<float>(bg_color.greenF());
    Settings::values.bg_blue = static_cast<float>(bg_color.blueF());
}

void ConfigureGraphics::updateShaders(bool anaglyph) {
    ui->shader_combobox->clear();

    if (anaglyph)
        ui->shader_combobox->addItem("dubois (builtin)");
    else
        ui->shader_combobox->addItem("none (builtin)");

    ui->shader_combobox->setCurrentIndex(0);

    for (const auto& shader : OpenGL::GetPostProcessingShaderList(anaglyph)) {
        ui->shader_combobox->addItem(QString::fromStdString(shader));
        if (Settings::values.pp_shader_name == shader)
            ui->shader_combobox->setCurrentIndex(ui->shader_combobox->count() - 1);
    }
}

void ConfigureGraphics::UpdateBackgroundColorButton(const QColor& color) {
    bg_color = color;

    QPixmap pixmap(ui->bg_button->size());
    pixmap.fill(bg_color);

    const QIcon color_icon(pixmap);
    ui->bg_button->setIcon(color_icon);
}

void ConfigureGraphics::RetranslateUI() {
    ui->retranslateUi(this);
}