#include <QtUiTools>
#include <QtSvg/QtSvg>
#include <utility>

#include "InsightWindow.hpp"
#include "AboutWindow.hpp"
#include "TargetWidgets/DIP/DualInlinePackageWidget.hpp"
#include "TargetWidgets/QFP/QuadFlatPackageWidget.hpp"
#include "src/Logger/Logger.hpp"
#include "src/Exceptions/Exception.hpp"
#include "src/Targets/TargetDescriptor.hpp"
#include "src/Helpers/Paths.hpp"

using namespace Bloom;
using namespace Bloom::Exceptions;
using namespace Bloom::InsightTargetWidgets;

using Bloom::Targets::TargetDescriptor;
using Bloom::Targets::TargetState;
using Bloom::Targets::TargetPinState;
using Bloom::Targets::TargetVariant;
using Bloom::Targets::TargetPackage;
using Bloom::Targets::TargetPinDescriptor;

void InsightWindow::init(
    QApplication& application,
    TargetDescriptor targetDescriptor
) {
    this->targetDescriptor = std::move(targetDescriptor);

    auto mainWindowUiFile = QFile(
        QString::fromStdString(Paths::compiledResourcesPath()
            + "/src/Insight/UserInterfaces/InsightWindow/UiFiles/InsightWindow.ui"
        )
    );
    auto mainWindowStylesheet = QFile(
        QString::fromStdString(Paths::compiledResourcesPath()
            + "/src/Insight/UserInterfaces/InsightWindow/Stylesheets/InsightWindow.qss"
        )
    );

    if (!mainWindowUiFile.open(QFile::ReadOnly)) {
        throw Exception("Failed to open InsightWindow UI file");
    }

    if (!mainWindowStylesheet.open(QFile::ReadOnly)) {
        throw Exception("Failed to open InsightWindow stylesheet file");
    }

    auto uiLoader = QUiLoader(this);
    this->mainWindowWidget = uiLoader.load(&mainWindowUiFile);
    this->mainWindowWidget->setStyleSheet(mainWindowStylesheet.readAll());

    QApplication::setWindowIcon(QIcon(
        QString::fromStdString(Paths::compiledResourcesPath()
            + "/src/Insight/UserInterfaces/InsightWindow/Images/BloomIcon.svg"
        )
    ));
    this->ioContainerWidget = this->mainWindowWidget->findChild<QWidget*>("io-container");
    this->ioUnavailableWidget = this->mainWindowWidget->findChild<QLabel*>("io-inspection-unavailable");
    this->mainMenuBar = this->mainWindowWidget->findChild<QMenuBar*>("menu-bar");

    auto fileMenu = this->mainMenuBar->findChild<QMenu*>("file-menu");
    auto helpMenu = this->mainMenuBar->findChild<QMenu*>("help-menu");
    auto quitAction = fileMenu->findChild<QAction*>("close-insight");
    auto openReportIssuesUrlAction = helpMenu->findChild<QAction*>("open-report-issues-url");
    auto openGettingStartedUrlAction = helpMenu->findChild<QAction*>("open-getting-started-url");
    auto openAboutWindowAction = helpMenu->findChild<QAction*>("open-about-dialogue");

    connect(quitAction, &QAction::triggered, this, &InsightWindow::close);
    connect(openReportIssuesUrlAction, &QAction::triggered, this, &InsightWindow::openReportIssuesUrl);
    connect(openGettingStartedUrlAction, &QAction::triggered, this, &InsightWindow::openGettingStartedUrl);
    connect(openAboutWindowAction, &QAction::triggered, this, &InsightWindow::openAboutWindow);

    this->header = this->mainWindowWidget->findChild<QWidget*>("header");
    this->refreshIoInspectionButton = this->header->findChild<QToolButton*>("refresh-io-inspection-btn");

    connect(this->refreshIoInspectionButton, &QToolButton::clicked, this, [this] {
        if (this->targetState == TargetState::STOPPED && this->selectedVariant != nullptr) {
            this->toggleUi(true);
            emit this->refreshTargetPinStates(this->selectedVariant->id);
        }
    });

    this->footer = this->mainWindowWidget->findChild<QWidget*>("footer");
    this->targetStatusLabel = this->footer->findChild<QLabel*>("target-state");
    this->programCounterValueLabel = this->footer->findChild<QLabel*>("target-program-counter-value");

    this->activate();

    /*
     * Do not delete svgWidget. It seems like it's absolutely pointless, but it's really not. I know this is gross but
     * I don't seem to have any other option.
     *
     * You see, we use Qt's SVG libraries for some icons and other graphics in the Insight window, but because these are
     * all loaded via the .ui and .qss file (at runtime, by Qt), and the fact that we don't use QSvgWidget anywhere in
     * our C++ code, the linker doesn't link the SVG library to the Bloom binary! This then leads to the failure of
     * rendering SVG images at runtime.
     *
     * I've scowered the internet looking for a solution to this, but I've found nothing! There was one post on the
     * Qt forum, where someone had the very same issue: https://forum.qt.io/topic/61875/cmake-is-not-linking but no
     * helpful responses.
     *
     * The easy solution is finding an excuse to use the QSvgWidget class in our code, but we have no real requirement
     * of that.
     *
     * So for now, I'm just going to create an instance to QSvgWidget() here. Doing so will force the linker to link
     * the libQt5Svg library. This will need to remain here until I find a better solution, or an actual need for the
     * QSVGWidget class in our code.
     */
    auto svgWidget = QSvgWidget();
}

void InsightWindow::activate() {
    auto targetNameLabel = this->footer->findChild<QLabel*>("target-name");
    auto targetIdLabel = this->footer->findChild<QLabel*>("target-id");
    targetNameLabel->setText(QString::fromStdString(this->targetDescriptor.name));
    targetIdLabel->setText("0x" + QString::fromStdString(this->targetDescriptor.id).remove("0x").toUpper());
    this->variantMenu = this->footer->findChild<QMenu*>("target-variant-menu");

    this->ioUnavailableWidget->hide();

    std::optional<QString> previouslySelectedVariantName;
    if (this->selectedVariant != nullptr) {
        previouslySelectedVariantName = QString::fromStdString(this->selectedVariant->name).toLower();
        this->selectedVariant = nullptr;
    }

    this->supportedVariantsByName.clear();

    /*
     * We don't want to present the user with duplicate target variants.
     *
     * In the context of the Insight window, a variant that doesn't differ in package type or pinout
     * configuration is considered a duplicate.
     */
    auto processedVariants = std::vector<TargetVariant>();
    auto isDuplicateVariant = [&processedVariants] (const TargetVariant& variantA) {
        return std::ranges::any_of(
            processedVariants.begin(),
            processedVariants.end(),
            [&variantA, &processedVariants] (const TargetVariant& variantB) {
                if (variantA.package != variantB.package) {
                    return false;
                }

                if (variantA.pinDescriptorsByNumber.size() != variantB.pinDescriptorsByNumber.size()) {
                    return false;
                }

                if (variantA.pinDescriptorsByNumber != variantB.pinDescriptorsByNumber) {
                    return false;
                }

                return true;
            }
        );
    };

    for (const auto& targetVariant: this->targetDescriptor.variants) {
        if (isDuplicateVariant(targetVariant)) {
            continue;
        }

        auto variantAction = new QAction(this->variantMenu);
        variantAction->setText(
            QString::fromStdString(targetVariant.name + " (" + targetVariant.packageName + ")")
        );

        if (InsightWindow::isVariantSupported(targetVariant)) {
            auto supportedVariantPtr = &(this->supportedVariantsByName.insert(
                std::pair(QString::fromStdString(targetVariant.name).toLower(), targetVariant)
            ).first->second);

            connect(
                variantAction,
                &QAction::triggered,
                this,
                [this, supportedVariantPtr] {
                    this->selectVariant(supportedVariantPtr);
                }
            );

        } else {
            variantAction->setEnabled(false);
            variantAction->setText(variantAction->text() + " (unsupported)");
        }

        this->variantMenu->addAction(variantAction);
        processedVariants.push_back(targetVariant);
    }

    this->variantMenu->setEnabled(true);

    Logger::debug("Number of target variants supported by Insight: " + std::to_string(supportedVariantsByName.size()));

    if (!this->supportedVariantsByName.empty()) {
        if (previouslySelectedVariantName.has_value()
            && this->supportedVariantsByName.contains(previouslySelectedVariantName.value())
        ) {
            this->selectVariant(&(this->supportedVariantsByName.at(previouslySelectedVariantName.value())));

        } else if (this->targetConfig.variantName.has_value()) {
            auto selectedVariantName = QString::fromStdString(this->targetConfig.variantName.value());
            if (this->supportedVariantsByName.contains(selectedVariantName)) {
                // The user has specified a valid variant name in their config file, so use that as the default
                this->selectVariant(&(this->supportedVariantsByName.at(selectedVariantName)));
            }

        } else {
            if (this->targetConfig.variantName.has_value()) {
                Logger::error("Invalid target variant name \"" + this->targetConfig.variantName.value()
                    + "\" - no such variant with the given name was found.");
            }

            this->selectVariant(&(this->supportedVariantsByName.begin()->second));
        }

    } else {
        if (this->targetDescriptor.variants.empty()) {
            this->variantMenu->parentWidget()->hide();
        }

        this->ioUnavailableWidget->setText(
            "GPIO inspection is not available for this target. "
            "Please report this to Bloom developers by clicking Help -> Report An Issue"
        );
        this->ioUnavailableWidget->show();
    }

    this->toggleUi(this->targetState != TargetState::STOPPED);
    this->activated = true;
}

void InsightWindow::deactivate() {
    if (this->targetPackageWidget != nullptr) {
        this->targetPackageWidget->hide();
        this->targetPackageWidget->deleteLater();
        this->targetPackageWidget = nullptr;
    }

    this->ioUnavailableWidget->setText(
        "Insight deactivated - Bloom has been disconnected from the target.\n\n"
        "Bloom will attempt to reconnect upon the start of a new debug session."
    );
    this->ioUnavailableWidget->show();

    this->targetStatusLabel->setText("Unknown");
    this->programCounterValueLabel->setText("-");

    this->variantMenu->clear();
    this->variantMenu->setEnabled(false);

    this->toggleUi(true);
    this->activated = false;
}

bool InsightWindow::isVariantSupported(const TargetVariant& variant) {
    if (variant.package == TargetPackage::DIP
        || variant.package == TargetPackage::SOIC
        || variant.package == TargetPackage::SSOP
    ) {
        // All DIP, SOIC and SSOP variants must have a pin count that is a multiple of two
        if (variant.pinDescriptorsByNumber.size() % 2 == 0) {
            return true;
        }
    }

    if (variant.package == TargetPackage::QFP || variant.package == TargetPackage::QFN) {
        // All QFP and QFN variants must have a pin count that is a multiple of four
        if (variant.pinDescriptorsByNumber.size() % 4 == 0) {
            return true;
        }
    }

    return false;
}

void InsightWindow::selectVariant(const TargetVariant* variant) {
    if (!this->isVariantSupported(*variant)) {
        Logger::error("Attempted to select unsupported target variant.");
        return;
    }

    if (this->selectedVariant != nullptr && this->selectedVariant->id == variant->id) {
        return;
    }

    if (this->targetPackageWidget != nullptr) {
        this->targetPackageWidget->hide();
        this->targetPackageWidget->deleteLater();
        this->targetPackageWidget = nullptr;
    }

    this->selectedVariant = variant;
    this->variantMenu->setTitle(QString::fromStdString(variant->name + " (" + variant->packageName + ")"));

    if (variant->package == TargetPackage::DIP
        || variant->package == TargetPackage::SOIC
        || variant->package == TargetPackage::SSOP
    ) {
        this->targetPackageWidget = new InsightTargetWidgets::Dip::DualInlinePackageWidget(
            *variant,
            this,
            this->ioContainerWidget
        );

    } else if (variant->package == TargetPackage::QFP || variant->package == TargetPackage::QFN) {
        this->targetPackageWidget = new InsightTargetWidgets::Qfp::QuadFlatPackageWidget(
            *variant,
            this,
            this->ioContainerWidget
        );
    }

    if (this->targetPackageWidget != nullptr) {
        if (this->targetState == TargetState::STOPPED) {
            this->toggleUi(true);
            emit this->refreshTargetPinStates(variant->id);
        }

        this->targetPackageWidget->show();
    }
}

void InsightWindow::show() {
    this->mainWindowWidget->activateWindow();
    this->mainWindowWidget->show();
}

void InsightWindow::close() {
    if (this->mainWindowWidget != nullptr) {
        this->mainWindowWidget->close();
    }
}

void InsightWindow::toggleUi(bool disable) {
    this->uiDisabled = disable;

    if (this->refreshIoInspectionButton != nullptr) {
        this->refreshIoInspectionButton->setDisabled(disable);
        this->refreshIoInspectionButton->repaint();
    }

    if (this->ioContainerWidget != nullptr) {
        this->ioContainerWidget->setDisabled(disable);
        this->ioContainerWidget->repaint();
    }
}

void InsightWindow::onTargetControllerSuspended() {
    if (this->activated) {
        this->deactivate();
    }
}

void InsightWindow::onTargetControllerResumed(const TargetDescriptor& targetDescriptor) {
    if (!this->activated) {
        this->targetDescriptor = targetDescriptor;
        this->activate();
    }
}

void InsightWindow::openReportIssuesUrl() {
    auto url = QUrl("https://bloom.oscillate.io/report-issue");
    /*
     * The https://bloom.oscillate.io/report-issue URL just redirects to the Bloom GitHub issue page.
     *
     * We can use query parameters in the URL to pre-fill the body of the issue. We use this to include some
     * target information.
     */
    auto urlQuery = QUrlQuery();
    auto issueBody = QString("Issue reported via Bloom Insight.\nTarget name: "
        + QString::fromStdString(this->targetDescriptor.name) + "\n"
        + "Target ID: " + QString::fromStdString(this->targetDescriptor.id) + "\n"
    );

    if (this->selectedVariant != nullptr) {
        issueBody += "Target variant: " + QString::fromStdString(this->selectedVariant->name) + "\n";
    }

    issueBody += "\nPlease describe your issue below. Include as much detail as possible.";
    urlQuery.addQueryItem("body", issueBody);
    url.setQuery(urlQuery);

    QDesktopServices::openUrl(url);
}

void InsightWindow::openGettingStartedUrl() {
    QDesktopServices::openUrl(QUrl("https://bloom.oscillate.io/docs/getting-started"));
}

void InsightWindow::openAboutWindow() {
    if (this->aboutWindowWidget == nullptr) {
        this->aboutWindowWidget = new AboutWindow(this->mainWindowWidget);
    }

    this->aboutWindowWidget->show();
}

void InsightWindow::onTargetStateUpdate(TargetState newState) {
    this->targetState = newState;

    if (newState == TargetState::RUNNING) {
        this->targetStatusLabel->setText("Running");
        this->programCounterValueLabel->setText("-");
        this->toggleUi(true);

    } else if (newState == TargetState::STOPPED) {
        this->targetStatusLabel->setText("Stopped");

        if (this->selectedVariant != nullptr) {
            emit this->refreshTargetPinStates(this->selectedVariant->id);
        }

    } else {
        this->targetStatusLabel->setText("Unknown");
    }
}

void InsightWindow::onTargetProgramCounterUpdate(quint32 programCounter) {
    this->programCounterValueLabel->setText(
        "0x" + QString::number(programCounter, 16).toUpper() + " (" + QString::number(programCounter) + ")"
    );
}

void InsightWindow::onTargetIoPortsUpdate() {
    if (this->targetState == TargetState::STOPPED && this->selectedVariant != nullptr) {
        emit this->refreshTargetPinStates(this->selectedVariant->id);
    }
}

void InsightWindow::onTargetPinStatesUpdate(int variantId, Bloom::Targets::TargetPinStateMappingType pinStatesByNumber) {
    if (this->targetPackageWidget != nullptr
        && this->selectedVariant != nullptr
        && this->selectedVariant->id == variantId
    ) {
        this->targetPackageWidget->updatePinStates(pinStatesByNumber);
        if (this->targetState == TargetState::STOPPED && this->uiDisabled) {
            this->toggleUi(false);

        } else {
            this->targetPackageWidget->repaint();
        }
    }
}

void InsightWindow::togglePinIoState(TargetPinWidget* pinWidget) {
    auto pinState = pinWidget->getPinState();

    // Currently, we only allow users to toggle the IO state of output pins
    if (pinState.has_value()
        && pinState.value().ioDirection == TargetPinState::IoDirection::OUTPUT
        && this->selectedVariant != nullptr
    ) {
        auto& pinDescriptor = pinWidget->getPinDescriptor();
        pinState.value().ioState = (pinState.value().ioState == TargetPinState::IoState::HIGH) ?
            TargetPinState::IoState::LOW : TargetPinState::IoState::HIGH;
        emit this->setTargetPinState(this->selectedVariant->id, pinDescriptor, pinState.value());
    }
}