#include <windows.h>
#include <QApplication>
#include <QDebug>
#include <QMessageBox>
#include <QProcess>
#include <QProgressDialog>
#include <QInputDialog>
#include <QLineEdit>
#include <QTextCodec>
#include "UpdateLogic.h"
#include "../Common/ConfigHelper.h"
#include "../Common/PolicyHelper.h"
#include "../Common/LocalStateHelper.h"
#include "../Common/TicketHelper.h"
#include "../Common/DeviceIdentityHelper.h"
#include <QFile>
#include <QFileDialog>
#include <QDir>

int main(int argc, char* argv[])
{
    SetConsoleOutputCP(65001);
    QTextCodec::setCodecForLocale(QTextCodec::codecForName("UTF-8"));
    QApplication app(argc, argv);
    QApplication::setApplicationName("Marsco Launcher");

    QProgressDialog progress("正在检查软件更新...", QString(), 0, 0);
    progress.setWindowTitle("Marsco 软件启动器");
    progress.setCancelButton(nullptr);
    progress.setWindowModality(Qt::ApplicationModal);
    progress.setMinimumDuration(0);
    progress.setAutoClose(false);
    progress.show();
    QApplication::processEvents();

    const QString appDir = QApplication::applicationDirPath();
    ConfigHelper& config = ConfigHelper::instance();
    const auto isLicenseError = [](const QString& errorText) {
        const QString text = errorText.toLower();
        return text.contains("license")
            || errorText.contains("授权")
            || errorText.contains("过期")
            || errorText.contains("设备数量已达到上限")
            || errorText.contains("已绑定其他授权");
    };
    const auto clearDeviceCredential = [&]() {
        QFile::remove(QDir(appDir).filePath("config/client_identity.dat"));
        config.setValue("Update", "device_id", QString());
    };
    QString licenseKey = config.getValue("License", "license_key").trimmed();
    auto promptAndSaveLicense = [&](const QString& reason) -> QString {
        QString promptReason = reason;
        while (true) {
            progress.close();
            bool accepted = false;
            const QString appName = config.getValue("App", "app_name").trimmed();
            const QString prompt = promptReason.trimmed().isEmpty()
                ? QString("请输入%1授权 License：").arg(appName.isEmpty() ? "软件" : appName)
                : QString("%1\n\n请重新输入%2授权 License：").arg(promptReason, appName.isEmpty() ? "软件" : appName);
            licenseKey = QInputDialog::getText(
                nullptr,
                "输入 License",
                prompt,
                QLineEdit::Normal,
                QString(),
                &accepted
            ).trimmed();
            if (!accepted) {
                QMessageBox::information(nullptr, "需要 License", "首次启动需要输入管理员提供的 License。");
                return QString();
            }
            if (licenseKey.isEmpty()) {
                QMessageBox::warning(nullptr, "License 不能为空", "请粘贴管理员在后台创建的 License。");
                promptReason.clear();
                continue;
            }
            if (!config.setValue("License", "license_key", licenseKey)) {
                QMessageBox::critical(nullptr, "保存 License 失败",
                    QString("无法写入配置文件：%1\n%2").arg(config.configPath(), config.lastError()));
                return QString();
            }
            progress.show();
            progress.setLabelText("正在验证 License...");
            QApplication::processEvents();
            return licenseKey;
        }
    };

    while (true) {
        if (licenseKey.isEmpty()) {
            licenseKey = promptAndSaveLicense(QString());
            if (licenseKey.isEmpty()) return 0;
        }
        DeviceIdentityHelper identity(appDir);
        if (identity.ensureIssued(config.getValue("Server", "api_base_url"),
                                  config.getValue("Server", "client_token"),
                                  config.getValue("App", "app_id"),
                                  config.getValue("App", "channel"),
                                  licenseKey)) {
            break;
        }
        const QString error = identity.errorString();
        if (!isLicenseError(error)) {
            progress.close();
            QMessageBox::critical(nullptr, "设备身份验证失败", error);
            return -1;
        }
        clearDeviceCredential();
        licenseKey = promptAndSaveLicense(QString("当前 License 无法使用：%1").arg(error));
        if (licenseKey.isEmpty()) return 0;
    }

    UpdateLogic logic;
    logic.checkUpdate();

    const bool needUpdate = logic.getNeedUpdate();
    const bool networkOk = logic.isNetworkOk();
    const QString latestVer = logic.getLatestVersion();
    const QJsonObject response = logic.getCheckResult();
    const int targetVersionId = response.value("version_id").toInt();
    const QString appId = logic.getAppId();
    const QString channel = logic.getChannel();

    if (logic.lastStatusCode() == 401 || logic.lastStatusCode() == 403) {
        progress.close();
        const QJsonValue detail = response.value("detail");
        const QString message = detail.isObject() ? detail.toObject().value("msg").toString() : detail.toString();
        const QString displayMessage = message.isEmpty() ? "设备或 License 授权无效。" : message;
        if (isLicenseError(displayMessage)) {
            clearDeviceCredential();
            const QString newLicense = promptAndSaveLicense(QString("当前授权被服务端拒绝：%1").arg(displayMessage));
            if (!newLicense.isEmpty()) {
                progress.close();
                QMessageBox::information(nullptr, "License 已保存", "请重新启动 Launcher 完成设备授权和更新检查。");
            }
            return 0;
        }
        QMessageBox::critical(nullptr, "授权被拒绝", displayMessage);
        return -1;
    }

    const QString launchToken = config.getValue("App", "launch_token");
    const QString currentVersion = config.getValue("App", "current_version");
    const auto configuredName = [&](const QString& key, const QString& fallback) {
        const QString value = config.getValue("Runtime", key).trimmed();
        return value.isEmpty() ? fallback : value;
    };
    const QString mainExecutable = configuredName("main_executable", "MainApp.exe");
    const QString updaterExecutable = configuredName("updater_executable", "Updater.exe");
    const QString mainAppPath = QDir(appDir).filePath(mainExecutable);
    const QString updaterPath = QDir(appDir).filePath(updaterExecutable);
    const auto importOfflinePackage = [&]() {
        const QString package = QFileDialog::getOpenFileName(nullptr, "选择离线更新包", QString(), "Marsco 离线更新包 (*.upd)");
        return package.isEmpty() ? false : QProcess::startDetached(updaterPath, QStringList{QString("--offline-package=%1").arg(package)});
    };
    const QString deviceId = config.getValue("Update", "device_id");
    if (QCoreApplication::arguments().contains("--import-offline")) {
        progress.close();
        if (!importOfflinePackage()) QMessageBox::information(nullptr, "离线更新", "未选择离线更新包。");
        return 0;
    }

    const auto startMainApp = [&]() {
        QString ticketPath;
        QString ticketError;
        if (!TicketHelper::createTicket(logic.getAppId(), deviceId, currentVersion,
                                        launchToken, &ticketPath, &ticketError)) {
            qDebug() << "Cannot create launch ticket:" << ticketError;
            return false;
        }
        const bool started = QProcess::startDetached(mainAppPath,
            QStringList{QString("--ticket-file=%1").arg(ticketPath)});
        if (!started) QFile::remove(ticketPath);
        return started;
    };

    progress.setLabelText("正在验证本地运行策略...");
    QApplication::processEvents();

    PolicyHelper policy(appDir);
    if (!policy.loadPolicy("config/version_policy.dat") || !policy.isValid())
    {
        progress.close();
        QMessageBox::critical(nullptr, "无法启动", QString("本地版本策略无效：%1").arg(policy.errorString()));
        return -1;
    }
    if (policy.isExpired())
    {
        progress.close();
        QMessageBox::critical(nullptr, "无法启动", "本地版本策略已过期，请连接网络或联系管理员。");
        return -1;
    }
    if ((!policy.allowRun() || !policy.isVersionAllowed(currentVersion)) && !(networkOk && needUpdate))
    {
        progress.close();
        QMessageBox::critical(nullptr, "当前版本不可运行",
            policy.message().isEmpty() ? QString("当前版本 %1 已被管理员停用。").arg(currentVersion)
                                       : policy.message());
        return -1;
    }

    LocalStateHelper state(appDir);
    if (!state.loadState())
    {
        progress.close();
        QMessageBox::critical(nullptr, "无法启动", QString("无法读取本地状态：%1").arg(state.errorString()));
        return -1;
    }
    if (state.isPolicySeqRolledBack(policy.policySeq()))
    {
        progress.close();
        QMessageBox::critical(nullptr, "安全检查失败", "检测到版本策略序列回退，已阻止启动。");
        return -1;
    }
    if (state.isSystemTimeRewound())
    {
        progress.close();
        QMessageBox::critical(nullptr, "安全检查失败", "检测到系统时间可能被回拨，已阻止启动。");
        return -1;
    }

    if (networkOk && needUpdate)
    {
        progress.close();
        const bool rollbackOperation = response.value("action").toString() == "rollback_allowed";
        const QString dialogTitle = rollbackOperation ? "版本回退"
            : (policy.forceUpdate() ? "必须更新" : "发现新版本");
        const QString prompt = policy.message().isEmpty()
            ? QString(rollbackOperation ? "管理员提供了版本 %1 作为回退目标，是否现在降级？"
                                        : "发现新版本 %1，是否现在更新？").arg(latestVer)
            : policy.message() + QString("\n目标版本：%1").arg(latestVer);
        bool accepted = true;
        if (policy.forceUpdate()) {
            QMessageBox::information(nullptr, dialogTitle, prompt);
        } else {
            accepted = QMessageBox::question(nullptr, dialogTitle, prompt,
                QMessageBox::Yes | QMessageBox::No, QMessageBox::No) == QMessageBox::Yes;
        }
        if (!accepted) {
            if (!startMainApp()) {
                QMessageBox::critical(nullptr, "启动失败", QString("无法启动主程序：%1").arg(mainAppPath));
                return -1;
            }
            return 0;
        }
        const QStringList updaterArgs{appId, channel, latestVer, QString::number(targetVersionId)};
        if (!QProcess::startDetached(updaterPath, updaterArgs))
        {
            QMessageBox::critical(nullptr, "更新器启动失败", QString("无法启动更新器：%1").arg(updaterPath));
            return -1;
        }
        return 0;
    }

    if (!networkOk) {
        progress.close();
        if (QMessageBox::question(nullptr, "服务器不可用", "当前无法连接更新服务器。是否导入离线更新包？",
                                  QMessageBox::Yes | QMessageBox::No, QMessageBox::No) == QMessageBox::Yes) {
            if (!importOfflinePackage()) QMessageBox::information(nullptr, "离线更新", "未选择离线更新包或无法启动更新器。");
            return 0;
        }
        progress.show();
    }

    if (!networkOk && !policy.isOfflineAllowed())
    {
        progress.close();
        QMessageBox::critical(nullptr, "网络不可用", "无法连接更新服务器，且当前策略不允许离线启动。");
        return -1;
    }

    progress.setLabelText(networkOk ? "当前已是最新版本，正在启动..." : "当前处于离线模式，正在启动...");
    QApplication::processEvents();
    if (!startMainApp())
    {
        progress.close();
        QMessageBox::critical(nullptr, "启动失败", QString("无法启动主程序：%1").arg(mainAppPath));
        return -1;
    }
    progress.close();
    return 0;
}