#include "login_page.h"

#include <QCheckBox>
#include <QComboBox>
#include <QFont>
#include <QGridLayout>
#include <QHBoxLayout>
#include <QLabel>
#include <QLineEdit>
#include <QProcess>
#include <QPushButton>
#include <QVBoxLayout>

namespace vdi {
namespace {

const char* kResolutionIds[] = {"1920x1440", "2560x1440", "1920x1080", "1280x720"};

QString detectNetworkSummary() {
    // 取默认路由的出接口与该接口上的 IPv4 地址
    QProcess process;
    process.start("sh", QStringList() << "-c" <<
                  "dev=$(ip -4 route show default | awk '{print $NF}' | head -n 1); "
                  "addr=$(ip -4 -o addr show dev \"$dev\" | awk '{print $4}' | head -n 1); "
                  "echo \"$dev $addr\"");
    process.waitForFinished(2000);
    const QString out = QString::fromUtf8(process.readAllStandardOutput()).trimmed();
    if (out.isEmpty()) {
        return QStringLiteral("网络：未连接");
    }
    const QStringList parts = out.split(' ', Qt::SkipEmptyParts);
    QString iface = parts.value(0);
    QString addr = parts.value(1);
    if (addr.contains('/')) {
        addr = addr.split('/').value(0);
    }
    if (iface.isEmpty()) {
        return QStringLiteral("网络：未连接");
    }
    return QStringLiteral("网络：%1 (%2)").arg(iface, addr);
}

}  // namespace

LoginPage::LoginPage(const TerminalConfig& initial, QWidget* parent)
    : QWidget(parent), cfg_(initial) {
    auto* root = new QVBoxLayout(this);
    root->setContentsMargins(80, 60, 80, 40);
    root->setSpacing(18);

    // ---- 标题区 ----
    auto* title = new QLabel(QStringLiteral("VDI 云终端"), this);
    QFont titleFont = title->font();
    titleFont.setPointSize(28);
    titleFont.setBold(true);
    title->setFont(titleFont);
    title->setAlignment(Qt::AlignCenter);
    root->addWidget(title);

    auto* subtitle = new QLabel(QStringLiteral("RK3528 远程桌面接入"), this);
    QFont subFont = subtitle->font();
    subFont.setPointSize(13);
    subtitle->setFont(subFont);
    subtitle->setAlignment(Qt::AlignCenter);
    subtitle->setStyleSheet(QStringLiteral("color: #8a94a6;"));
    root->addWidget(subtitle);

    // ---- 设备信息条 ----
    auto* infoBox = new QHBoxLayout();
    labelSn_ = new QLabel(QStringLiteral("设备 SN：%1").arg(QString::fromStdString(cfg_.sn)), this);
    labelNetwork_ = new QLabel(detectNetworkSummary(), this);
    labelSn_->setStyleSheet(QStringLiteral("color: #8a94a6;"));
    labelNetwork_->setStyleSheet(QStringLiteral("color: #8a94a6;"));
    infoBox->addWidget(labelSn_);
    infoBox->addStretch(1);
    infoBox->addWidget(labelNetwork_);
    root->addLayout(infoBox);

    // ---- 表单 ----
    auto* grid = new QGridLayout();
    grid->setHorizontalSpacing(14);
    grid->setVerticalSpacing(12);
    grid->setColumnStretch(1, 1);

    editServer_ = new QLineEdit(QString::fromStdString(cfg_.server), this);
    editServer_->setPlaceholderText(QStringLiteral("服务器地址，例如 192.168.1.70"));
    editUser_ = new QLineEdit(QString::fromStdString(cfg_.username), this);
    editUser_->setPlaceholderText(QStringLiteral("登录账号"));
    editPassword_ = new QLineEdit(QString::fromStdString(cfg_.password), this);
    editPassword_->setEchoMode(QLineEdit::Password);
    editPassword_->setPlaceholderText(QStringLiteral("登录密码（可留空）"));

    comboResolution_ = new QComboBox(this);
    for (const char* id : kResolutionIds) {
        comboResolution_->addItem(QString::fromLatin1(id), QString::fromLatin1(id));
    }
    int resIndex = comboResolution_->findData(QString::fromStdString(cfg_.resolution));
    comboResolution_->setCurrentIndex(resIndex >= 0 ? resIndex : 0);

    checkRemember_ = new QCheckBox(QStringLiteral("记住连接参数"), this);
    checkRemember_->setChecked(cfg_.remember);

    struct Row {
        QString label;
        QWidget* widget;
    };
    const Row rows[] = {
        {QStringLiteral("服务器地址"), editServer_},
        {QStringLiteral("登录账号"), editUser_},
        {QStringLiteral("登录密码"), editPassword_},
        {QStringLiteral("显示分辨率"), comboResolution_},
    };
    int row = 0;
    for (const Row& r : rows) {
        auto* label = new QLabel(r.label, this);
        label->setAlignment(Qt::AlignRight | Qt::AlignVCenter);
        grid->addWidget(label, row, 0);
        grid->addWidget(r.widget, row, 1);
        ++row;
    }
    grid->addWidget(checkRemember_, row, 1);
    root->addLayout(grid);

    // ---- 按钮 ----
    auto* buttonRow = new QHBoxLayout();
    buttonRow->addStretch(1);
    buttonConnect_ = new QPushButton(QStringLiteral("连接"), this);
    buttonConnect_->setMinimumSize(160, 46);
    buttonConnect_->setStyleSheet(
        QStringLiteral("QPushButton { background: #2f6feb; color: white; border: none; "
                       "border-radius: 6px; font-weight: bold; }"
                       "QPushButton:disabled { background: #3a4a63; }"));
    buttonConnect_->setDefault(true);
    buttonQuit_ = new QPushButton(QStringLiteral("退出"), this);
    buttonQuit_->setMinimumSize(110, 46);

    buttonRow->addWidget(buttonConnect_);
    buttonRow->addWidget(buttonQuit_);
    buttonRow->addStretch(1);
    root->addLayout(buttonRow);

    // ---- 状态条 ----
    labelStatus_ = new QLabel(QStringLiteral("就绪"), this);
    labelStatus_->setAlignment(Qt::AlignCenter);
    labelStatus_->setStyleSheet(QStringLiteral("color: #8a94a6;"));
    root->addWidget(labelStatus_);
    root->addStretch(1);

    connect(buttonConnect_, &QPushButton::clicked, this, &LoginPage::onConnectClicked);
    connect(buttonQuit_, &QPushButton::clicked, this, [this]() { emit quitRequested(); });
}

void LoginPage::setConnectHandler(ConnectHandler handler) {
    connectHandler_ = std::move(handler);
}

void LoginPage::setStatus(const QString& text, bool error) {
    labelStatus_->setText(text);
    labelStatus_->setStyleSheet(
        QStringLiteral("color: %1;").arg(error ? QStringLiteral("#e05561")
                                                : QStringLiteral("#8a94a6")));
}

void LoginPage::setBusy(bool busy) {
    buttonConnect_->setEnabled(!busy);
    buttonConnect_->setText(busy ? QStringLiteral("连接中…") : QStringLiteral("连接"));
    editServer_->setEnabled(!busy);
    editUser_->setEnabled(!busy);
    editPassword_->setEnabled(!busy);
    comboResolution_->setEnabled(!busy);
}

TerminalConfig LoginPage::currentConfig() const {
    TerminalConfig out = cfg_;
    out.server = editServer_->text().trimmed().toStdString();
    out.username = editUser_->text().trimmed().toStdString();
    out.password = editPassword_->text().toStdString();
    out.resolution = comboResolution_->currentData().toString().toStdString();
    out.remember = checkRemember_->isChecked();
    return out;
}

void LoginPage::onConnectClicked() {
    TerminalConfig cfg = currentConfig();
    if (cfg.server.empty()) {
        setStatus(QStringLiteral("请填写服务器地址"), true);
        return;
    }
    setBusy(true);
    setStatus(QStringLiteral("正在连接 %1 …").arg(QString::fromStdString(cfg.server)));

    if (cfg.remember) {
        saveConfig(cfg);
    }
    if (connectHandler_) {
        connectHandler_(cfg);
    }
    emit connectRequested(cfg);
}

}  // namespace vdi