#include "SettingsDialog.hpp"

#include <QComboBox>
#include <QCoreApplication>
#include <QHBoxLayout>
#include <QLabel>
#include <QListWidget>
#include <QProcess>
#include <QPushButton>
#include <QStackedWidget>
#include <QTextBrowser>
#include <QVBoxLayout>
#include <QWidget>

#include "Theme.hpp"

namespace geopro::app {

namespace {

// 「标签 + 控件」一行（标签定宽左对齐，控件右随）。
QWidget* makeRow(const QString& label, QWidget* control) {
    auto* row = new QWidget();
    auto* lay = new QHBoxLayout(row);
    lay->setContentsMargins(0, 0, 0, 0);
    lay->setSpacing(12);
    auto* lbl = new QLabel(label, row);
    lbl->setMinimumWidth(96);
    lay->addWidget(lbl);
    lay->addWidget(control, 1);
    return row;
}

// 区段标题。
QLabel* sectionTitle(const QString& text, QWidget* parent) {
    auto* t = new QLabel(text, parent);
    t->setStyleSheet(QStringLiteral("font-size:%1px; font-weight:600;")
                         .arg(geopro::app::scaledPx(geopro::app::type::kHeading)));
    return t;
}

QWidget* buildAppearancePage() {
    auto* page = new QWidget();
    auto* v = new QVBoxLayout(page);
    v->setContentsMargins(24, 20, 24, 20);
    v->setSpacing(16);
    v->addWidget(sectionTitle(QStringLiteral("外观"), page));

    // 主题：跟随系统 / 浅色 / 深色（热切）。
    auto* themeCombo = new QComboBox(page);
    themeCombo->addItem(QStringLiteral("跟随系统"), QStringLiteral("system"));
    themeCombo->addItem(QStringLiteral("浅色"), QStringLiteral("light"));
    themeCombo->addItem(QStringLiteral("深色"), QStringLiteral("dark"));
    const QString curTheme = geopro::app::themeModePreference();
    themeCombo->setCurrentIndex(themeCombo->findData(curTheme) >= 0 ? themeCombo->findData(curTheme) : 0);
    QObject::connect(themeCombo, &QComboBox::activated, page, [themeCombo](int) {
        geopro::app::setThemeModePreference(themeCombo->currentData().toString());
    });
    v->addWidget(makeRow(QStringLiteral("主题"), themeCombo));

    // 界面字号：小/标准/大/特大（重启生效）。
    auto* fontCombo = new QComboBox(page);
    fontCombo->addItem(QStringLiteral("小"), 90);
    fontCombo->addItem(QStringLiteral("标准"), 100);
    fontCombo->addItem(QStringLiteral("大"), 115);
    fontCombo->addItem(QStringLiteral("特大"), 130);
    const int curScale = geopro::app::fontScalePreference();
    fontCombo->setCurrentIndex(fontCombo->findData(curScale) >= 0 ? fontCombo->findData(curScale) : 1);
    v->addWidget(makeRow(QStringLiteral("界面字号"), fontCombo));

    // 字号改动：持久化 + 提示重启（提供立即重启）。
    auto* restartRow = new QWidget(page);
    auto* rlay = new QHBoxLayout(restartRow);
    rlay->setContentsMargins(96 + 12, 0, 0, 0);  // 与控件列对齐
    rlay->setSpacing(10);
    auto* hint = new QLabel(QStringLiteral("界面字号将在重启后生效"), restartRow);
    geopro::app::applyTokenizedStyleSheet(
        hint, QStringLiteral("color:{{text/secondary}}; font-size:%1px;")
                  .arg(geopro::app::scaledPx(geopro::app::type::kCaption)));
    auto* restartBtn = new QPushButton(QStringLiteral("立即重启"), restartRow);
    rlay->addWidget(hint);
    rlay->addWidget(restartBtn);
    rlay->addStretch();
    restartRow->setVisible(false);
    v->addWidget(restartRow);

    QObject::connect(fontCombo, &QComboBox::activated, page, [fontCombo, restartRow](int) {
        geopro::app::setFontScalePreference(fontCombo->currentData().toInt());
        restartRow->setVisible(true);
    });
    QObject::connect(restartBtn, &QPushButton::clicked, restartBtn, [] {
        QProcess::startDetached(QCoreApplication::applicationFilePath(),
                                QCoreApplication::arguments().mid(1));
        qApp->quit();
    });

    v->addStretch();
    return page;
}

QWidget* buildAboutPage() {
    auto* page = new QWidget();
    auto* v = new QVBoxLayout(page);
    v->setContentsMargins(24, 20, 24, 20);
    v->setSpacing(12);
    v->addWidget(sectionTitle(QStringLiteral("关于"), page));

    auto* ver = new QLabel(QStringLiteral("Geopro 3.0 — 项目分析视图 (M1)"), page);
    ver->setStyleSheet(QStringLiteral("font-size:%1px; font-weight:600;")
                           .arg(geopro::app::scaledPx(geopro::app::type::kTitle)));
    v->addWidget(ver);

    auto* license = new QTextBrowser(page);
    license->setOpenExternalLinks(true);
    license->setHtml(QStringLiteral(
        "<b>第三方组件与许可证</b>"
        "<table cellpadding='3' style='margin-top:6px'>"
        "<tr><td>Qt 6</td><td>GUI 框架</td><td>LGPL-3.0</td></tr>"
        "<tr><td>VTK 9</td><td>二维/三维渲染</td><td>BSD-3-Clause</td></tr>"
        "<tr><td>Qt-Advanced-Docking-System</td><td>停靠布局</td><td>LGPL-2.1</td></tr>"
        "<tr><td>QtKeychain</td><td>凭证安全存取</td><td>BSD-3-Clause</td></tr>"
        "</table>"
        "<p style='margin-top:8px'>完整声明见随附 <i>NOTICE.md</i>。</p>"));
    v->addWidget(license, 1);
    return page;
}

}  // namespace

SettingsDialog::SettingsDialog(QWidget* parent) : QDialog(parent) {
    setWindowTitle(QStringLiteral("设置"));
    resize(720, 480);

    auto* root = new QHBoxLayout(this);
    root->setContentsMargins(0, 0, 0, 0);
    root->setSpacing(0);

    // 左：分类列表。
    auto* sidebar = new QListWidget(this);
    sidebar->setObjectName(QStringLiteral("settingsSidebar"));
    sidebar->setFixedWidth(150);
    sidebar->addItem(QStringLiteral("外观"));
    sidebar->addItem(QStringLiteral("关于"));
    root->addWidget(sidebar);

    // 右：分页。
    auto* stack = new QStackedWidget(this);
    stack->addWidget(buildAppearancePage());
    stack->addWidget(buildAboutPage());
    root->addWidget(stack, 1);

    QObject::connect(sidebar, &QListWidget::currentRowChanged, stack,
                     &QStackedWidget::setCurrentIndex);
    sidebar->setCurrentRow(0);
}

}  // namespace geopro::app