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// Copyright 2018 Citra Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.

#include <QCameraDevice>
#include <QDirIterator>
#include <QFileDialog>
#include <QImageReader>
#include <QMediaDevices>
#include <QMessageBox>
#include <QWidget>
#include "citra_qt/configuration/configure_camera.h"
#include "common/settings.h"
#include "core/frontend/camera/factory.h"
#include "core/hle/service/cam/cam.h"
#include "ui_configure_camera.h"

#if defined(__APPLE__)
#include "common/apple_authorization.h"
#endif

const std::array<std::string, 3> ConfigureCamera::Implementations = {
    "blank", /* Blank */
    "image", /* Image */
    "qt"     /* System Camera */
};

ConfigureCamera::ConfigureCamera(QWidget* parent)
    : QWidget(parent), ui(std::make_unique<Ui::ConfigureCamera>()) {
    ui->setupUi(this);
    // Load settings
    camera_name = Settings::values.camera_name;
    camera_config = Settings::values.camera_config;
    camera_flip = Settings::values.camera_flip;
    const QList<QCameraDevice> cameras = QMediaDevices::videoInputs();
    for (const QCameraDevice& camera : cameras) {
        ui->system_camera->addItem(camera.description());
    }
    UpdateCameraMode();
    SetConfiguration();
    ConnectEvents();
    ui->preview_box->setHidden(true);
}

ConfigureCamera::~ConfigureCamera() {
    StopPreviewing();
}

void ConfigureCamera::ConnectEvents() {
    connect(ui->image_source, qOverload<int>(&QComboBox::currentIndexChanged), this,
            [this](int index) {
                StopPreviewing();
                UpdateImageSourceUI();
#if defined(__APPLE__)
                if (index == 2) {
                    AppleAuthorization::CheckAuthorizationForCamera();
                }
#endif
            });
    connect(ui->camera_selection, qOverload<int>(&QComboBox::currentIndexChanged), this, [this] {
        StopPreviewing();
        if (GetCameraSelection() != current_selected) {
            RecordConfig();
        }
        if (ui->camera_selection->currentIndex() == 1) {
            ui->camera_mode->setCurrentIndex(1); // Double
            if (camera_name[0] == camera_name[2] && camera_config[0] == camera_config[2]) {
                ui->camera_mode->setCurrentIndex(0); // Single
            }
        }
        UpdateCameraMode();
        SetConfiguration();
    });
    connect(ui->camera_mode, qOverload<int>(&QComboBox::currentIndexChanged), this, [this] {
        StopPreviewing();
        ui->camera_position_label->setVisible(ui->camera_mode->currentIndex() == 1);
        ui->camera_position->setVisible(ui->camera_mode->currentIndex() == 1);
        current_selected = GetCameraSelection();
    });
    connect(ui->camera_position, qOverload<int>(&QComboBox::currentIndexChanged), this, [this] {
        StopPreviewing();
        if (GetCameraSelection() != current_selected) {
            RecordConfig();
        }
        SetConfiguration();
    });
    connect(ui->toolButton, &QToolButton::clicked, this, &ConfigureCamera::OnToolButtonClicked);
    connect(ui->preview_button, &QPushButton::clicked, this, [this] { StartPreviewing(); });
    connect(ui->prompt_before_load, &QCheckBox::stateChanged, this, [this](int state) {
        ui->camera_file->setDisabled(state == Qt::Checked);
        ui->toolButton->setDisabled(state == Qt::Checked);
        if (state == Qt::Checked) {
            ui->camera_file->setText(QString{});
        }
    });
    connect(ui->camera_file, &QLineEdit::textChanged, this, [this] { StopPreviewing(); });
    connect(ui->system_camera, qOverload<int>(&QComboBox::currentIndexChanged), this,
            [this] { StopPreviewing(); });
    connect(ui->camera_flip, qOverload<int>(&QComboBox::currentIndexChanged), this,
            [this] { StopPreviewing(); });
}

void ConfigureCamera::UpdateCameraMode() {
    CameraPosition pos = GetCameraSelection();
    // Set the visibility of the camera mode selection widgets
    if (pos == CameraPosition::RearBoth) {
        ui->camera_position->setHidden(true);
        ui->camera_position_label->setHidden(true);
        ui->camera_mode->setHidden(false);
        ui->camera_mode_label->setHidden(false);
    } else {
        ui->camera_position->setHidden(pos == CameraPosition::Front);
        ui->camera_position_label->setHidden(pos == CameraPosition::Front);
        ui->camera_mode->setHidden(pos == CameraPosition::Front);
        ui->camera_mode_label->setHidden(pos == CameraPosition::Front);
    }
}

void ConfigureCamera::UpdateImageSourceUI() {
    int image_source = ui->image_source->currentIndex();
    switch (image_source) {
    case 0: /* blank */
    case 2: /* system camera */
        ui->prompt_before_load->setHidden(true);
        ui->prompt_before_load->setChecked(false);
        ui->camera_file_label->setHidden(true);
        ui->camera_file->setHidden(true);
        ui->camera_file->setText(QString{});
        ui->toolButton->setHidden(true);
        break;
    case 1: /* still image */
        ui->prompt_before_load->setHidden(false);
        ui->camera_file_label->setHidden(false);
        ui->camera_file->setHidden(false);
        ui->toolButton->setHidden(false);
        if (camera_config[GetSelectedCameraIndex()].empty()) {
            ui->prompt_before_load->setChecked(true);
            ui->camera_file->setDisabled(true);
            ui->toolButton->setDisabled(true);
            ui->camera_file->setText(QString{});
        } else {
            ui->camera_file->setDisabled(false);
            ui->toolButton->setDisabled(false);
        }
        break;
    default:
        LOG_ERROR(Service_CAM, "Unknown image source {}", image_source);
    }
    ui->system_camera_label->setHidden(image_source != 2);
    ui->system_camera->setHidden(image_source != 2);
    ui->camera_flip_label->setHidden(image_source == 0);
    ui->camera_flip->setHidden(image_source == 0);
}

void ConfigureCamera::RecordConfig() {
    std::string implementation = Implementations[ui->image_source->currentIndex()];
    int image_source = ui->image_source->currentIndex();
    std::string config;
    if (image_source == 2) { /* system camera */
        if (ui->system_camera->currentIndex() == 0) {
            config = "";
        } else {
            config = ui->system_camera->currentText().toStdString();
        }
    } else {
        config = ui->camera_file->text().toStdString();
    }
    if (current_selected == CameraPosition::RearBoth) {
        camera_name[0] = camera_name[2] = implementation;
        camera_config[0] = camera_config[2] = config;
        camera_flip[0] = camera_flip[2] = ui->camera_flip->currentIndex();
    } else if (current_selected != CameraPosition::Null) {
        int index = static_cast<int>(current_selected);
        camera_name[index] = implementation;
        camera_config[index] = config;
        camera_flip[index] = ui->camera_flip->currentIndex();
    }
    current_selected = GetCameraSelection();
}

void ConfigureCamera::StartPreviewing() {
    current_selected = GetCameraSelection();
    RecordConfig();
    int camera_selection = GetSelectedCameraIndex();
    StopPreviewing();
    // Init preview box
    ui->preview_box->setHidden(false);
    ui->preview_button->setHidden(true);
    preview_width = ui->preview_box->size().width();
    preview_height = static_cast<int>(preview_width * 0.75);
    ui->preview_box->setToolTip(
        tr("Resolution: %1*%2")
            .arg(QString::number(preview_width), QString::number(preview_height)));
    // Load previewing camera
    previewing_camera = Camera::CreateCameraPreview(
        camera_name[camera_selection], camera_config[camera_selection], preview_width,
        preview_height, static_cast<Service::CAM::Flip>(camera_flip[camera_selection]));
    if (!previewing_camera) {
        StopPreviewing();
        return;
    }
    previewing_camera->SetResolution(
        {static_cast<u16>(preview_width), static_cast<u16>(preview_height)});
    previewing_camera->SetEffect(Service::CAM::Effect::None);
    previewing_camera->SetFlip(Service::CAM::Flip::None);
    previewing_camera->SetFormat(Service::CAM::OutputFormat::RGB565);
    previewing_camera->SetFrameRate(Service::CAM::FrameRate::Rate_30);
    previewing_camera->StartCapture();

    timer_id = startTimer(1000 / 30);
}

void ConfigureCamera::StopPreviewing() {
    ui->preview_box->setHidden(true);
    ui->preview_button->setHidden(false);

    if (previewing_camera) {
        previewing_camera->StopCapture();
    }

    if (timer_id != 0) {
        killTimer(timer_id);
        timer_id = 0;
    }
}

void ConfigureCamera::timerEvent(QTimerEvent* event) {
    if (event->timerId() != timer_id) {
        return;
    }
    if (!previewing_camera) {
        killTimer(timer_id);
        timer_id = 0;
        return;
    }
    std::vector<u16> frame = previewing_camera->ReceiveFrame();
    int width = ui->preview_box->size().width();
    int height = static_cast<int>(width * 0.75);
    if (width != preview_width || height != preview_height) {
        StopPreviewing();
        return;
    }
    QImage image(width, height, QImage::Format::Format_RGB16);
    std::memcpy(image.bits(), frame.data(), width * height * sizeof(u16));
    ui->preview_box->setPixmap(QPixmap::fromImage(image));
}

void ConfigureCamera::SetConfiguration() {
    int index = GetSelectedCameraIndex();
    for (std::size_t i = 0; i < Implementations.size(); i++) {
        if (Implementations[i] == camera_name[index]) {
            ui->image_source->setCurrentIndex(static_cast<int>(i));
        }
    }
    if (camera_name[index] == "image") {
        ui->camera_file->setDisabled(camera_config[index].empty());
        ui->toolButton->setDisabled(camera_config[index].empty());
        if (camera_config[index].empty()) {
            ui->camera_file->setText(QString{});
        }
    }
    if (camera_name[index] == "qt") {
#ifdef __APPLE__
        AppleAuthorization::CheckAuthorizationForCamera();
#endif
        ui->system_camera->setCurrentIndex(0);
        if (!camera_config[index].empty()) {
            ui->system_camera->setCurrentText(QString::fromStdString(camera_config[index]));
        }
    } else {
        ui->camera_file->setText(QString::fromStdString(camera_config[index]));
    }
    ui->camera_flip->setCurrentIndex(camera_flip[index]);
    UpdateImageSourceUI();
}

void ConfigureCamera::OnToolButtonClicked() {
    StopPreviewing();
    QList<QByteArray> types = QImageReader::supportedImageFormats();
    QList<QString> temp_filters;
    for (const QByteArray& type : types) {
        temp_filters << QStringLiteral("*.%1").arg(QString::fromUtf8(type));
    }
    QString filter = tr("Supported image files (%1)").arg(temp_filters.join(QStringLiteral(" ")));
    QString path = QFileDialog::getOpenFileName(this, tr("Open File"), QStringLiteral("."), filter);
    if (!path.isEmpty()) {
        ui->camera_file->setText(path);
    }
}

void ConfigureCamera::ApplyConfiguration() {
    RecordConfig();
    StopPreviewing();
    Settings::values.camera_name = camera_name;
    Settings::values.camera_config = camera_config;
    Settings::values.camera_flip = camera_flip;
}

ConfigureCamera::CameraPosition ConfigureCamera::GetCameraSelection() {
    switch (ui->camera_selection->currentIndex()) {
    case 0: // Front
        return CameraPosition::Front;
    case 1: // Rear
        if (ui->camera_mode->currentIndex() == 0) {
            // Single (2D) mode
            return CameraPosition::RearBoth;
        } else {
            // Double (3D) mode
            return (ui->camera_position->currentIndex() == 0) ? CameraPosition::RearLeft
                                                              : CameraPosition::RearRight;
        }
    default:
        LOG_ERROR(Frontend, "Unknown camera selection");
        return CameraPosition::Front;
    }
}

int ConfigureCamera::GetSelectedCameraIndex() {
    CameraPosition pos = GetCameraSelection();
    int camera_selection = static_cast<int>(pos);
    if (pos == CameraPosition::RearBoth) { // Single Mode
        camera_selection = 0;              // Either camera is the same, so we return RearRight
    }
    return camera_selection;
}

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

	// Copyright 2018 Citra Emulator Project
	// Licensed under GPLv2 or any later version
	// Refer to the license.txt file included.

	#include <QCameraDevice>
	#include <QDirIterator>
	#include <QFileDialog>
	#include <QImageReader>
	#include <QMediaDevices>
	#include <QMessageBox>
	#include <QWidget>
	#include "citra_qt/configuration/configure_camera.h"
	#include "common/settings.h"
	#include "core/frontend/camera/factory.h"
	#include "core/hle/service/cam/cam.h"
	#include "ui_configure_camera.h"

	#if defined(__APPLE__)
	#include "common/apple_authorization.h"
	#endif

	const std::array<std::string, 3> ConfigureCamera::Implementations = {
	"blank", /* Blank */
	"image", /* Image */
	"qt" /* System Camera */
	};

	ConfigureCamera::ConfigureCamera(QWidget* parent)
	: QWidget(parent), ui(std::make_unique<Ui::ConfigureCamera>()) {
	ui->setupUi(this);
	// Load settings
	camera_name = Settings::values.camera_name;
	camera_config = Settings::values.camera_config;
	camera_flip = Settings::values.camera_flip;
	const QList<QCameraDevice> cameras = QMediaDevices::videoInputs();
	for (const QCameraDevice& camera : cameras) {
	ui->system_camera->addItem(camera.description());
	}
	UpdateCameraMode();
	SetConfiguration();
	ConnectEvents();
	ui->preview_box->setHidden(true);
	}

	ConfigureCamera::~ConfigureCamera() {
	StopPreviewing();
	}

	void ConfigureCamera::ConnectEvents() {
	connect(ui->image_source, qOverload<int>(&QComboBox::currentIndexChanged), this,
	[this](int index) {
	StopPreviewing();
	UpdateImageSourceUI();
	#if defined(__APPLE__)
	if (index == 2) {
	AppleAuthorization::CheckAuthorizationForCamera();
	}
	#endif
	});
	connect(ui->camera_selection, qOverload<int>(&QComboBox::currentIndexChanged), this, [this] {
	StopPreviewing();
	if (GetCameraSelection() != current_selected) {
	RecordConfig();
	}
	if (ui->camera_selection->currentIndex() == 1) {
	ui->camera_mode->setCurrentIndex(1); // Double
	if (camera_name[0] == camera_name[2] && camera_config[0] == camera_config[2]) {
	ui->camera_mode->setCurrentIndex(0); // Single
	}
	}
	UpdateCameraMode();
	SetConfiguration();
	});
	connect(ui->camera_mode, qOverload<int>(&QComboBox::currentIndexChanged), this, [this] {
	StopPreviewing();
	ui->camera_position_label->setVisible(ui->camera_mode->currentIndex() == 1);
	ui->camera_position->setVisible(ui->camera_mode->currentIndex() == 1);
	current_selected = GetCameraSelection();
	});
	connect(ui->camera_position, qOverload<int>(&QComboBox::currentIndexChanged), this, [this] {
	StopPreviewing();
	if (GetCameraSelection() != current_selected) {
	RecordConfig();
	}
	SetConfiguration();
	});
	connect(ui->toolButton, &QToolButton::clicked, this, &ConfigureCamera::OnToolButtonClicked);
	connect(ui->preview_button, &QPushButton::clicked, this, [this] { StartPreviewing(); });
	connect(ui->prompt_before_load, &QCheckBox::stateChanged, this, [this](int state) {
	ui->camera_file->setDisabled(state == Qt::Checked);
	ui->toolButton->setDisabled(state == Qt::Checked);
	if (state == Qt::Checked) {
	ui->camera_file->setText(QString{});
	}
	});
	connect(ui->camera_file, &QLineEdit::textChanged, this, [this] { StopPreviewing(); });
	connect(ui->system_camera, qOverload<int>(&QComboBox::currentIndexChanged), this,
	[this] { StopPreviewing(); });
	connect(ui->camera_flip, qOverload<int>(&QComboBox::currentIndexChanged), this,
	[this] { StopPreviewing(); });
	}

	void ConfigureCamera::UpdateCameraMode() {
	CameraPosition pos = GetCameraSelection();
	// Set the visibility of the camera mode selection widgets
	if (pos == CameraPosition::RearBoth) {
	ui->camera_position->setHidden(true);
	ui->camera_position_label->setHidden(true);
	ui->camera_mode->setHidden(false);
	ui->camera_mode_label->setHidden(false);
	} else {
	ui->camera_position->setHidden(pos == CameraPosition::Front);
	ui->camera_position_label->setHidden(pos == CameraPosition::Front);
	ui->camera_mode->setHidden(pos == CameraPosition::Front);
	ui->camera_mode_label->setHidden(pos == CameraPosition::Front);
	}
	}

	void ConfigureCamera::UpdateImageSourceUI() {
	int image_source = ui->image_source->currentIndex();
	switch (image_source) {
	case 0: /* blank */
	case 2: /* system camera */
	ui->prompt_before_load->setHidden(true);
	ui->prompt_before_load->setChecked(false);
	ui->camera_file_label->setHidden(true);
	ui->camera_file->setHidden(true);
	ui->camera_file->setText(QString{});
	ui->toolButton->setHidden(true);
	break;
	case 1: /* still image */
	ui->prompt_before_load->setHidden(false);
	ui->camera_file_label->setHidden(false);
	ui->camera_file->setHidden(false);
	ui->toolButton->setHidden(false);
	if (camera_config[GetSelectedCameraIndex()].empty()) {
	ui->prompt_before_load->setChecked(true);
	ui->camera_file->setDisabled(true);
	ui->toolButton->setDisabled(true);
	ui->camera_file->setText(QString{});
	} else {
	ui->camera_file->setDisabled(false);
	ui->toolButton->setDisabled(false);
	}
	break;
	default:
	LOG_ERROR(Service_CAM, "Unknown image source {}", image_source);
	}
	ui->system_camera_label->setHidden(image_source != 2);
	ui->system_camera->setHidden(image_source != 2);
	ui->camera_flip_label->setHidden(image_source == 0);
	ui->camera_flip->setHidden(image_source == 0);
	}

	void ConfigureCamera::RecordConfig() {
	std::string implementation = Implementations[ui->image_source->currentIndex()];
	int image_source = ui->image_source->currentIndex();
	std::string config;
	if (image_source == 2) { /* system camera */
	if (ui->system_camera->currentIndex() == 0) {
	config = "";
	} else {
	config = ui->system_camera->currentText().toStdString();
	}
	} else {
	config = ui->camera_file->text().toStdString();
	}
	if (current_selected == CameraPosition::RearBoth) {
	camera_name[0] = camera_name[2] = implementation;
	camera_config[0] = camera_config[2] = config;
	camera_flip[0] = camera_flip[2] = ui->camera_flip->currentIndex();
	} else if (current_selected != CameraPosition::Null) {
	int index = static_cast<int>(current_selected);
	camera_name[index] = implementation;
	camera_config[index] = config;
	camera_flip[index] = ui->camera_flip->currentIndex();
	}
	current_selected = GetCameraSelection();
	}

	void ConfigureCamera::StartPreviewing() {
	current_selected = GetCameraSelection();
	RecordConfig();
	int camera_selection = GetSelectedCameraIndex();
	StopPreviewing();
	// Init preview box
	ui->preview_box->setHidden(false);
	ui->preview_button->setHidden(true);
	preview_width = ui->preview_box->size().width();
	preview_height = static_cast<int>(preview_width * 0.75);
	ui->preview_box->setToolTip(
	tr("Resolution: %1*%2")
	.arg(QString::number(preview_width), QString::number(preview_height)));
	// Load previewing camera
	previewing_camera = Camera::CreateCameraPreview(
	camera_name[camera_selection], camera_config[camera_selection], preview_width,
	preview_height, static_cast<Service::CAM::Flip>(camera_flip[camera_selection]));
	if (!previewing_camera) {
	StopPreviewing();
	return;
	}
	previewing_camera->SetResolution(
	{static_cast<u16>(preview_width), static_cast<u16>(preview_height)});
	previewing_camera->SetEffect(Service::CAM::Effect::None);
	previewing_camera->SetFlip(Service::CAM::Flip::None);
	previewing_camera->SetFormat(Service::CAM::OutputFormat::RGB565);
	previewing_camera->SetFrameRate(Service::CAM::FrameRate::Rate_30);
	previewing_camera->StartCapture();

	timer_id = startTimer(1000 / 30);
	}

	void ConfigureCamera::StopPreviewing() {
	ui->preview_box->setHidden(true);
	ui->preview_button->setHidden(false);

	if (previewing_camera) {
	previewing_camera->StopCapture();
	}

	if (timer_id != 0) {
	killTimer(timer_id);
	timer_id = 0;
	}
	}

	void ConfigureCamera::timerEvent(QTimerEvent* event) {
	if (event->timerId() != timer_id) {
	return;
	}
	if (!previewing_camera) {
	killTimer(timer_id);
	timer_id = 0;
	return;
	}
	std::vector<u16> frame = previewing_camera->ReceiveFrame();
	int width = ui->preview_box->size().width();
	int height = static_cast<int>(width * 0.75);
	if (width != preview_width \|\| height != preview_height) {
	StopPreviewing();
	return;
	}
	QImage image(width, height, QImage::Format::Format_RGB16);
	std::memcpy(image.bits(), frame.data(), width * height * sizeof(u16));
	ui->preview_box->setPixmap(QPixmap::fromImage(image));
	}

	void ConfigureCamera::SetConfiguration() {
	int index = GetSelectedCameraIndex();
	for (std::size_t i = 0; i < Implementations.size(); i++) {
	if (Implementations[i] == camera_name[index]) {
	ui->image_source->setCurrentIndex(static_cast<int>(i));
	}
	}
	if (camera_name[index] == "image") {
	ui->camera_file->setDisabled(camera_config[index].empty());
	ui->toolButton->setDisabled(camera_config[index].empty());
	if (camera_config[index].empty()) {
	ui->camera_file->setText(QString{});
	}
	}
	if (camera_name[index] == "qt") {
	#ifdef __APPLE__
	AppleAuthorization::CheckAuthorizationForCamera();
	#endif
	ui->system_camera->setCurrentIndex(0);
	if (!camera_config[index].empty()) {
	ui->system_camera->setCurrentText(QString::fromStdString(camera_config[index]));
	}
	} else {
	ui->camera_file->setText(QString::fromStdString(camera_config[index]));
	}
	ui->camera_flip->setCurrentIndex(camera_flip[index]);
	UpdateImageSourceUI();
	}

	void ConfigureCamera::OnToolButtonClicked() {
	StopPreviewing();
	QList<QByteArray> types = QImageReader::supportedImageFormats();
	QList<QString> temp_filters;
	for (const QByteArray& type : types) {
	temp_filters << QStringLiteral("*.%1").arg(QString::fromUtf8(type));
	}
	QString filter = tr("Supported image files (%1)").arg(temp_filters.join(QStringLiteral(" ")));
	QString path = QFileDialog::getOpenFileName(this, tr("Open File"), QStringLiteral("."), filter);
	if (!path.isEmpty()) {
	ui->camera_file->setText(path);
	}
	}

	void ConfigureCamera::ApplyConfiguration() {
	RecordConfig();
	StopPreviewing();
	Settings::values.camera_name = camera_name;
	Settings::values.camera_config = camera_config;
	Settings::values.camera_flip = camera_flip;
	}

	ConfigureCamera::CameraPosition ConfigureCamera::GetCameraSelection() {
	switch (ui->camera_selection->currentIndex()) {
	case 0: // Front
	return CameraPosition::Front;
	case 1: // Rear
	if (ui->camera_mode->currentIndex() == 0) {
	// Single (2D) mode
	return CameraPosition::RearBoth;
	} else {
	// Double (3D) mode
	return (ui->camera_position->currentIndex() == 0) ? CameraPosition::RearLeft
	: CameraPosition::RearRight;
	}
	default:
	LOG_ERROR(Frontend, "Unknown camera selection");
	return CameraPosition::Front;
	}
	}

	int ConfigureCamera::GetSelectedCameraIndex() {
	CameraPosition pos = GetCameraSelection();
	int camera_selection = static_cast<int>(pos);
	if (pos == CameraPosition::RearBoth) { // Single Mode
	camera_selection = 0; // Either camera is the same, so we return RearRight
	}
	return camera_selection;
	}

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