#include "Theme.hpp"

#include "Glyphs.hpp"

#include <QApplication>
#include <QColor>
#include <QFont>
#include <QObject>
#include <QPalette>
#include <QProxyStyle>
#include <QSettings>
#include <QStyleFactory>
#include <QStyleHints>
#include <QWidget>

namespace geopro::app {

namespace {

// 应用样式：在 Fusion 基础上把下拉框弹窗改为「列表紧贴文本框下方」（而非 Fusion 默认的
// 菜单式弹窗覆盖当前项——那会导致弹窗位置怪、容器+列表两层、选中不清）。
class AppProxyStyle : public QProxyStyle {
public:
    AppProxyStyle() : QProxyStyle(QStyleFactory::create(QStringLiteral("Fusion"))) {}
    int styleHint(StyleHint hint, const QStyleOption* opt, const QWidget* w,
                  QStyleHintReturn* ret) const override
    {
        if (hint == QStyle::SH_ComboBox_Popup) return 0;
        return QProxyStyle::styleHint(hint, opt, w, ret);
    }
};

// ── 语义令牌表（全 UI 唯一颜色来源）。改色只改这一处。 ──────────────────
// 取值来源：规范 §1.5 语义映射 + 附录 A 速查 + §1.3 画布专用色。
// 画布(canvas/*)与 bg/canvas 两模式同值——规范 §0.5「视图区永远深色」。
struct Token { const char* name; const char* light; const char* dark; };
const Token kTokens[] = {
    // 背景
    {"bg/app",            "#F7F8FA", "#0E1116"},
    {"bg/panel",          "#FFFFFF", "#161A20"},
    {"bg/panel-subtle",   "#FCFCFD", "#161B22"},
    {"bg/header",         "#FFFFFF", "#12161C"},
    {"bg/hover",          "#EFF1F4", "#1B2129"},
    {"bg/selected",       "#EFF5FF", "#16243F"},
    {"bg/canvas",         "#0B1320", "#0B1320"},
    // 边框
    {"border/default",    "#E3E6EB", "#262C35"},
    {"border/strong",     "#CDD2DA", "#333B45"},
    {"border/focus",      "#3B73EC", "#5E8DF5"},
    // 文字
    {"text/primary",      "#272C35", "#E6E9EF"},
    {"text/secondary",    "#5A626F", "#A4ADBB"},
    {"text/tertiary",     "#7C8493", "#7A8494"},
    {"text/disabled",     "#A8AFBC", "#5A626F"},
    {"text/link",         "#3B73EC", "#5E8DF5"},
    {"text/on-primary",   "#FFFFFF", "#FFFFFF"},
    // 强调
    {"accent/primary",        "#3B73EC", "#5E8DF5"},
    {"accent/primary-hover",  "#2B5FD9", "#93B4FA"},
    {"accent/primary-pressed","#2450B8", "#3B73EC"},
    // 其他
    {"divider",               "#E3E6EB", "#22272F"},
    {"scrollbar/thumb",       "#CDD2DA", "#3A424D"},
    {"scrollbar/thumb-hover", "#A8AFBC", "#4A535F"},
    // 状态色（主色 + 浅底）规范 §1.4
    {"status/danger",     "#E5484D", "#FF6166"},
    {"status/danger-bg",  "#FDECEC", "#3A1D1F"},
    {"status/warning",    "#E08A1E", "#F5A623"},
    {"status/warning-bg", "#FBF0DD", "#3A2C12"},
    {"status/success",    "#2E9E5B", "#46C07A"},
    {"status/success-bg", "#E7F6ED", "#16301F"},
    {"status/info",       "#3B73EC", "#5E8DF5"},
    {"status/info-bg",    "#EFF5FF", "#16243F"},
    {"status/neutral",    "#7C8493", "#8A93A3"},
    // 画布专用（两模式同值）规范 §1.3
    {"canvas/bg",         "#0B1320", "#0B1320"},
    {"canvas/bg-soft",    "#111B2D", "#111B2D"},
    {"canvas/grid",       "#1E2A3D", "#1E2A3D"},
    {"canvas/text",       "#E6ECF5", "#E6ECF5"},
    {"canvas/text-dim",   "#8A97AC", "#8A97AC"},
};

QString tokenHex(const char* name, bool dark)
{
    for (const auto& t : kTokens)
        if (qstrcmp(t.name, name) == 0) return QString::fromLatin1(dark ? t.dark : t.light);
    return QStringLiteral("#FF00FF");  // 漏配的令牌显眼品红，便于一眼发现
}

// 全局样式表（浅色专业）。只描述外观，不含任何交互逻辑。
// 注意：刻意不重写 QCheckBox::indicator —— Fusion 一旦检测到 indicator 子控件被改写，
//       就需要自带勾选 image，否则勾选态会变成空白方块。这里交给 Fusion 原生绘制，
//       它会自动采用调色板的 Highlight(accent/primary) 作勾选色，省去打包图片资源。
const char* kStyleSheet = R"QSS(
/* ── 基础 ───────────────────────────────────────────────── */
QWidget {
    color: {{text/primary}};
}
QMainWindow, QDialog {
    background: {{bg/app}};
}
/* QToolTip 不写 QSS：用系统原生工具提示（自定义 QSS 会让弹窗圆角露直角、且不像原生）。 */

/* ── 视图内工具条（2D/3D、数据详情）：白底分段控件，柔和不刺眼 ── */
QToolBar {
    background: {{bg/panel}};
    border: none;
    border-bottom: 1px solid {{divider}};
    padding: 6px 8px;
    spacing: 4px;
}
QToolBar QToolButton {
    background: transparent;
    color: {{text/secondary}};
    border: none;
    border-radius: 8px;
    padding: 6px 14px;
    font-weight: 500;
}
QToolBar QToolButton:hover {
    background: {{bg/hover}};
    color: {{text/primary}};
}
QToolBar QToolButton:pressed {
    background: {{bg/selected}};
}
QToolBar QToolButton:checked {
    background: {{bg/hover}};
    color: {{accent/primary}};
    font-weight: 600;
}
QToolBar QToolButton:checked:hover {
    background: {{bg/selected}};
}
QToolBar::separator {
    background: {{divider}};
    width: 1px;
    margin: 6px 8px;
}

/* ── 树 / 列表：无边框（靠面板与留白分隔，去掉线框感）+ 充足行距 ── */
QTreeWidget, QListWidget, QTreeView, QListView {
    background: {{bg/panel}};
    border: none;
    padding: 6px;
    outline: none;
}
QTreeWidget::item, QListWidget::item, QTreeView::item, QListView::item {
    padding: 4px 8px;
}
QTreeWidget::item:hover, QListWidget::item:hover,
QTreeView::item:hover, QListView::item:hover {
    background: {{bg/hover}};
}
QTreeWidget::item:selected, QListWidget::item:selected,
QTreeView::item:selected, QListView::item:selected {
    background: {{bg/selected}};
    color: {{text/primary}};
}
QTreeWidget::item:selected:!active, QListWidget::item:selected:!active,
QTreeView::item:selected:!active, QListView::item:selected:!active {
    background: {{bg/selected}};
    color: {{text/primary}};
}
/* 注意：不要给 QTreeView::branch 设 background——一旦改写 branch，Qt 会停止绘制
   默认的展开/折叠箭头（与 indicator 同类陷阱），父节点折叠图标会消失。 */

/* 表头（对象显示栏） */
QHeaderView::section {
    background: {{bg/hover}};
    color: {{text/secondary}};
    border: none;
    border-bottom: 1px solid {{border/default}};
    padding: 6px 8px;
    font-weight: 600;
}

/* ── 标签页（数据 / 文件）：现代下划线 tab，无边框盒子 ──────── */
QTabWidget::pane {
    border: none;
    border-top: 1px solid {{divider}};
    top: 0;
    background: {{bg/panel}};
}
QTabBar {
    background: transparent;
}
QTabBar::tab {
    background: transparent;
    color: {{text/secondary}};
    border: none;
    border-bottom: 2px solid transparent;
    padding: 8px 16px;
    margin-right: 4px;
}
QTabBar::tab:selected {
    color: {{accent/primary}};
    border-bottom: 2px solid {{accent/primary}};
    font-weight: 600;
}
QTabBar::tab:hover:!selected {
    color: {{text/primary}};
}

/* ── 复选框（仅调间距/字色，indicator 交给 Fusion 原生）──── */
QCheckBox {
    spacing: 7px;
    color: {{text/primary}};
}
QCheckBox:disabled {
    color: {{text/disabled}};
}

/* ── 通用按钮 / 输入（登录窗内部各自再覆盖）────────────────── */
QPushButton {
    background: {{bg/panel}};
    color: {{text/primary}};
    border: 1px solid {{border/strong}};
    border-radius: 4px;  /* radius/sm */
    padding: 6px 14px;
}
QPushButton:hover {
    background: {{bg/hover}};
    border-color: {{accent/primary}};
}
QPushButton:pressed {
    background: {{bg/selected}};
}
QPushButton:default {
    background: {{accent/primary}};
    color: {{text/on-primary}};
    border-color: {{accent/primary}};
}
QPushButton:default:hover {
    background: {{accent/primary-hover}};
}
QPushButton:disabled {
    background: {{bg/app}};
    color: {{text/disabled}};
    border-color: {{border/default}};
}
/* 输入框（规范 §7.1）：默认 border/default、hover border/strong、focus border/focus。
   高 ~28px = 字号 13px + 上下 padding 6px + 边框 1px×2 ≈ min-height 16px。
   注意：Qt QSS 不支持 box-shadow，规范的 focus「外发光」无法实现，仅用 border/focus 近似。 */
QLineEdit {
    background: {{bg/panel}};
    color: {{text/primary}};
    border: 1px solid {{border/default}};
    border-radius: 4px;  /* radius/sm */
    padding: 6px 8px;
    min-height: 16px;
    selection-background-color: {{accent/primary}};
    selection-color: {{text/on-primary}};
}
QLineEdit:hover {
    border-color: {{border/strong}};
}
QLineEdit:focus {
    border: 1px solid {{border/focus}};
}
QLineEdit:disabled {
    background: {{bg/app}};
    color: {{text/disabled}};
}

/* 多行文本（备注/描述）：与输入框同款 box（边框/底色/圆角/内距），仅不设 min-height
   （高度由控件自定）。避免多行框沿用 Fusion 默认边框、与单行输入观感不一。 */
QPlainTextEdit, QTextEdit {
    background: {{bg/panel}};
    color: {{text/primary}};
    border: 1px solid {{border/default}};
    border-radius: 4px;  /* radius/sm */
    padding: 4px 8px;
    selection-background-color: {{accent/primary}};
    selection-color: {{text/on-primary}};
}
QPlainTextEdit:hover, QTextEdit:hover {
    border-color: {{border/strong}};
}
QPlainTextEdit:focus, QTextEdit:focus {
    border: 1px solid {{border/focus}};
}
QPlainTextEdit:disabled, QTextEdit:disabled {
    background: {{bg/app}};
    color: {{text/disabled}};
}

/* ── 滚动条：纤细现代（无需图片资源）───────────────────────── */
QScrollBar:vertical {
    background: transparent;
    width: 12px;
    margin: 2px;
}
QScrollBar::handle:vertical {
    background: {{scrollbar/thumb}};
    border-radius: 6px;
    min-height: 28px;
}
QScrollBar::handle:vertical:hover {
    background: {{scrollbar/thumb-hover}};
}
QScrollBar:horizontal {
    background: transparent;
    height: 12px;
    margin: 2px;
}
QScrollBar::handle:horizontal {
    background: {{scrollbar/thumb}};
    border-radius: 6px;
    min-width: 28px;
}
QScrollBar::handle:horizontal:hover {
    background: {{scrollbar/thumb-hover}};
}
QScrollBar::add-line, QScrollBar::sub-line {
    width: 0;
    height: 0;
}
QScrollBar::add-page, QScrollBar::sub-page {
    background: transparent;
}

/* ── 分隔条：默认近乎隐形，悬停时才显淡色（去掉灰硬条）──────── */
QSplitter::handle {
    background: {{divider}};
}
QSplitter::handle:hover {
    background: {{accent/primary}};
}
ads--CDockSplitter::handle {
    background: {{divider}};
}
ads--CDockSplitter::handle:hover {
    background: {{accent/primary}};
}

/* ── 状态栏：底部信息条（坐标系 / 状态指示，常驻可见）──────── */
QStatusBar {
    background: {{bg/panel}};
    color: {{text/secondary}};
    border-top: 1px solid {{divider}};
}
QStatusBar::item {
    border: none;
}
QStatusBar QLabel {
    color: {{text/secondary}};
    padding: 0 4px;
}

/* ── 菜单栏 / 菜单（标准 QMenuBar/QMenu）：刻意不设 border-radius——弹窗圆角靠系统(Win11
   原生圆角)，QSS 设圆角会露出后面的直角。仅设底/字/选中，干净不刺眼。 */
QMenuBar {
    background: {{bg/panel}};
    color: {{text/primary}};
    border-bottom: 1px solid {{divider}};
    padding: 2px 6px;
}
QMenuBar::item {
    background: transparent;
    padding: 6px 12px;
    border-radius: 4px;  /* radius/sm */
}
QMenuBar::item:selected {
    background: {{bg/hover}};
    color: {{accent/primary}};
}
QMenuBar::item:pressed {
    background: {{bg/selected}};
}
QMenu {
    background: {{bg/panel}};
    color: {{text/primary}};
    border: 1px solid {{border/default}};
    border-radius: 6px;  /* radius/md（浮层容器） */
    padding: 4px;
}
QMenu::item {
    padding: 6px 24px 6px 14px;
    border-radius: 4px;  /* radius/sm */
}
QMenu::item:selected {
    background: {{bg/hover}};
    color: {{accent/primary}};
}
QMenu::separator {
    height: 1px;
    background: {{divider}};
    margin: 4px 8px;
}

/* ── 下拉框（按需出现时也与主题一致）──────────────────────── */
/* 下拉框（规范 §7.2）：外观对齐输入框 —— 默认 border/default、hover border/strong、
   focus border/focus、radius/sm。弹窗用 radius/md（浮层），项 hover bg/hover。 */
QComboBox {
    background: {{bg/panel}};
    color: {{text/primary}};
    border: 1px solid {{border/default}};
    border-radius: 4px;  /* radius/sm */
    padding: 6px 8px;    /* 与 QLineEdit 完全一致 */
    min-height: 16px;    /* 与 QLineEdit 完全一致 → 同高（可编辑/不可编辑均如此）*/
}
QComboBox:hover {
    border-color: {{border/strong}};
}
QComboBox:focus {
    border-color: {{border/focus}};
}
QComboBox:disabled {
    background: {{bg/app}};
    color: {{text/disabled}};
}
/* 数字框/日期/时间编辑器：与输入框/下拉框同款外观。QSpinBox/QDoubleSpinBox/QDateEdit/
   QTimeEdit/QDateTimeEdit 均派生自 QAbstractSpinBox，一处统一其 box（高度/边框/圆角/内距），
   避免数字框比下拉框/输入框矮（历史坑：只给了 QLineEdit/QComboBox/Date 没给 SpinBox）。 */
QAbstractSpinBox {
    background: {{bg/panel}};
    color: {{text/primary}};
    border: 1px solid {{border/default}};
    border-radius: 4px;  /* radius/sm */
    padding: 6px 8px;
    min-height: 16px;    /* 与 QLineEdit/QComboBox 完全一致 → 同高 */
}
QAbstractSpinBox:hover {
    border-color: {{border/strong}};
}
QAbstractSpinBox:focus {
    border-color: {{border/focus}};
}
QAbstractSpinBox:disabled {
    background: {{bg/app}};
    color: {{text/disabled}};
}
/* 下拉按钮平面化（去 Fusion 原生斜角/分隔）+ 统一的扁平 chevron 箭头（qrc 内嵌 SVG）。
   覆写 ::drop-down 必须同时提供 ::down-arrow 图，否则箭头消失（历史坑）。 */
QComboBox::drop-down, QDateEdit::drop-down, QTimeEdit::drop-down, QDateTimeEdit::drop-down {
    subcontrol-origin: padding;
    subcontrol-position: center right;
    width: 20px;
    border: none;
    background: transparent;
}
QComboBox::down-arrow, QDateEdit::down-arrow, QTimeEdit::down-arrow, QDateTimeEdit::down-arrow {
    image: url(:/icons/chevron-down.svg);
    width: 12px;
    height: 12px;
}
/* 数字框上下按钮：平面化 + 扁平 chevron（与下拉箭头同族）。覆写 up/down-button 须同时给
   up/down-arrow 图，否则 Fusion 原生箭头消失。日期/时间用日历下拉（::drop-down），不在此列。 */
QSpinBox::up-button, QDoubleSpinBox::up-button {
    subcontrol-origin: border;
    subcontrol-position: top right;
    width: 18px;
    border: none;
    border-left: 1px solid {{border/default}};
    background: transparent;
}
QSpinBox::down-button, QDoubleSpinBox::down-button {
    subcontrol-origin: border;
    subcontrol-position: bottom right;
    width: 18px;
    border: none;
    border-left: 1px solid {{border/default}};
    background: transparent;
}
QSpinBox::up-button:hover, QDoubleSpinBox::up-button:hover,
QSpinBox::down-button:hover, QDoubleSpinBox::down-button:hover {
    background: {{bg/hover}};
}
QSpinBox::up-arrow, QDoubleSpinBox::up-arrow {
    image: url(:/icons/chevron-up.svg);
    width: 10px;
    height: 10px;
}
QSpinBox::down-arrow, QDoubleSpinBox::down-arrow {
    image: url(:/icons/chevron-down.svg);
    width: 10px;
    height: 10px;
}
QComboBox QAbstractItemView {
    background: {{bg/panel}};
    border: 1px solid {{border/default}};
    border-radius: 6px;  /* radius/md（浮层容器） */
    outline: none;
    padding: 2px;
}
QComboBox QAbstractItemView::item {
    border: none;
    padding: 6px 10px;
    min-height: 20px;
    color: {{text/primary}};
}
QComboBox QAbstractItemView::item:selected {
    background: {{bg/hover}};
    color: {{accent/primary}};
}

/* ── 分组框（按需出现时也与主题一致）──────────────────────── */
QGroupBox {
    border: 1px solid {{border/default}};
    border-radius: 8px;
    margin-top: 10px;
    padding-top: 6px;
    font-weight: 600;
}
QGroupBox::title {
    subcontrol-origin: margin;
    left: 12px;
    padding: 0 4px;
    color: {{text/secondary}};
}

/* ── 进度条（长任务反馈，遵循 Doherty 阈值）──────────────────── */
QProgressBar {
    background: {{divider}};
    border: none;
    border-radius: 6px;
    height: 8px;
    text-align: center;
    color: {{text/secondary}};
}
QProgressBar::chunk {
    background: {{accent/primary}};
    border-radius: 6px;
}

/* ── 滑块（规范 §6.13，如简化容差）：4px 轨道 + 已填充段强调色 + 14px 白圆手柄 ──
   handle margin -5px 使 14px 手柄在 4px 轨道上垂直居中。仅横向（app 用横向滑块）。 */
QSlider::groove:horizontal {
    height: 4px;
    background: {{border/default}};
    border-radius: 2px;
}
QSlider::sub-page:horizontal {
    background: {{accent/primary}};
    border-radius: 2px;
}
QSlider::add-page:horizontal {
    background: {{border/default}};
    border-radius: 2px;
}
QSlider::handle:horizontal {
    width: 14px;
    height: 14px;
    margin: -5px 0;
    border-radius: 7px;
    background: {{bg/panel}};
    border: 1px solid {{border/strong}};
}
QSlider::handle:horizontal:hover {
    border-color: {{accent/primary}};
}

/* 对话框容器圆角/投影（规范 §7.5 radius/lg + shadow/dialog）：Qt 顶层原生窗口忽略
   QSS 的 border-radius，且 QSS 无法绘制窗口外阴影——此处刻意不做，留待原生/QGraphicsEffect。 */

/* ── ADS 停靠：标题栏做成「固定面板表头」(对齐原型)──────────────
   面板已锁定(无关闭/浮动/拖动)，每个区只一个标签即表头：统一浅色头 +
   蓝色下划线强调 + 深色加粗标题。各区一致，读起来像固定子窗口表头。 */
ads--CDockAreaWidget {
    background: {{bg/app}};
}
ads--CDockAreaTitleBar {
    background: {{bg/hover}};
    border-bottom: 1px solid {{border/default}};
    padding: 0;
}
ads--CDockWidgetTab {
    background: {{bg/hover}};
    border: none;
    border-bottom: 2px solid transparent;
    padding: 7px 12px;
    min-height: 22px;
}
ads--CDockWidgetTab[activeTab="true"] {
    background: {{bg/hover}};
    border-bottom: 2px solid {{accent/primary}};
}
ads--CDockWidgetTab QLabel {
    color: {{text/secondary}};
    font-weight: 600;
}
ads--CDockWidgetTab[activeTab="true"] QLabel {
    color: {{text/primary}};
    font-weight: 600;
}
)QSS";

// 全局复选指示器：用 writeCheckboxIcon 生成清晰复选框 PNG（未选=明显边框空心框，
// 选中=强调色填充+白勾），统一作用于 QCheckBox 与 树/列表的勾选指示器。规避 Fusion
// 原生复选框在浅底下边框过淡看不清的问题——全 UI 一套，避免逐控件打补丁。
QString indicatorQss(bool dark)
{
    const QColor border = QColor(tokenHex("border/strong", dark));
    const QColor boxBg = QColor(tokenHex("bg/panel", dark));
    const QColor accent = QColor(tokenHex("accent/primary", dark));
    const QString tag = dark ? QStringLiteral("gd") : QStringLiteral("gl");  // 全局缓存标签
    const QString off = geopro::app::writeCheckboxIcon(false, border, boxBg, Qt::white, tag);
    const QString on = geopro::app::writeCheckboxIcon(true, accent, accent, Qt::white, tag);
    return QStringLiteral(
               "QCheckBox::indicator, QTreeView::indicator, QListView::indicator,"
               "QTreeWidget::indicator, QListWidget::indicator { width:16px; height:16px; }"
               "QCheckBox::indicator:unchecked, QTreeView::indicator:unchecked,"
               "QListView::indicator:unchecked, QTreeWidget::indicator:unchecked,"
               "QListWidget::indicator:unchecked { image:url(%1); }"
               "QCheckBox::indicator:checked, QTreeView::indicator:checked,"
               "QListView::indicator:checked, QTreeWidget::indicator:checked,"
               "QListWidget::indicator:checked { image:url(%2); }")
        .arg(off, on);
}

// 当前模式的全局 QSS。
QString styleSheetForMode(bool /*dark*/)
{
    const bool dark = isDarkTheme();
    return fillTokens(QString::fromUtf8(kStyleSheet)) + indicatorQss(dark);
}

// 调色板同样取自 ElaTheme，让无 QSS 覆盖处的标准控件也与外壳一致。
QPalette buildPalette(bool dark)
{
    QPalette p;
    const QColor shell    = QColor(tokenHex("bg/app", dark));
    const QColor panel    = QColor(tokenHex("bg/panel", dark));
    const QColor text     = QColor(tokenHex("text/primary", dark));
    const QColor muted    = QColor(tokenHex("text/secondary", dark));
    const QColor accent   = QColor(tokenHex("accent/primary", dark));
    const QColor border   = QColor(tokenHex("border/default", dark));
    const QColor disabled = QColor(tokenHex("text/disabled", dark));
    const QColor hoverBg  = QColor(tokenHex("bg/hover", dark));

    p.setColor(QPalette::Window, shell);
    p.setColor(QPalette::WindowText, text);
    p.setColor(QPalette::Base, panel);
    p.setColor(QPalette::AlternateBase, QColor(tokenHex("bg/panel-subtle", dark)));
    p.setColor(QPalette::Text, text);
    p.setColor(QPalette::Button, hoverBg);
    p.setColor(QPalette::ButtonText, text);
    p.setColor(QPalette::ToolTipBase, text);
    p.setColor(QPalette::ToolTipText, panel);
    p.setColor(QPalette::Highlight, accent);
    p.setColor(QPalette::HighlightedText, QColor(tokenHex("text/on-primary", dark)));
    p.setColor(QPalette::PlaceholderText, muted);
    p.setColor(QPalette::Link, accent);
    // Fusion 的明暗 3D 角色统一压成边框色，立体效果塌成平面（去斜角/凹槽）。
    p.setColor(QPalette::Light, panel);
    p.setColor(QPalette::Midlight, border);
    p.setColor(QPalette::Mid, border);
    p.setColor(QPalette::Dark, border);
    p.setColor(QPalette::Shadow, border);
    p.setColor(QPalette::Disabled, QPalette::Text, disabled);
    p.setColor(QPalette::Disabled, QPalette::WindowText, disabled);
    p.setColor(QPalette::Disabled, QPalette::ButtonText, disabled);
    return p;
}

}  // namespace

void applyThemeMode(QApplication& app, bool dark)
{
    // Fusion + 下拉框弹窗修正（AppProxyStyle）：跨平台一致、对 QSS 友好。
    app.setStyle(new AppProxyStyle());

    // 基础字体：微软雅黑 UI；基准字号取令牌 type::kBody(13px)，与 QSS 同单位。
    QFont base(QStringLiteral("Microsoft YaHei UI"));
    base.setPixelSize(scaledPx(type::kBody));  // 随界面字号缩放
    base.setStyleStrategy(QFont::PreferAntialias);
    app.setFont(base);

    app.setPalette(buildPalette(dark));
    app.setStyleSheet(styleSheetForMode(dark));
}

void applyTheme(QApplication& app)
{
    applyThemeMode(app, false);
}

// ── 主题管理器（替代 ElaTheme）+ 设置：主题 / 字号 偏好 ──────────────────
namespace {
constexpr int kBaseFontPx = 13;  // 基准字号
int g_fontScale = 100;           // 当前字号缩放百分比
}  // namespace

ThemeManager& ThemeManager::instance()
{
    static ThemeManager inst;
    return inst;
}

ThemeManager::ThemeManager(QObject* parent) : QObject(parent)
{
    applyPersisted();
    // 跟随系统时，系统明暗变化即同步并发 changed。
    QObject::connect(qApp->styleHints(), &QStyleHints::colorSchemeChanged, this,
                     [this](Qt::ColorScheme) {
                         if (!follow_) return;
                         const bool d = qApp->styleHints()->colorScheme() == Qt::ColorScheme::Dark;
                         if (d != dark_) {
                             dark_ = d;
                             emit changed();
                         }
                     });
}

void ThemeManager::applyPersisted()
{
    const QString m =
        QSettings().value(QStringLiteral("ui/themeMode"), QStringLiteral("system")).toString();
    if (m == QStringLiteral("light")) {
        follow_ = false;
        dark_ = false;
    } else if (m == QStringLiteral("dark")) {
        follow_ = false;
        dark_ = true;
    } else {  // system
        follow_ = true;
        dark_ = qApp->styleHints()->colorScheme() == Qt::ColorScheme::Dark;
    }
}

void ThemeManager::setMode(const QString& mode)
{
    QSettings().setValue(QStringLiteral("ui/themeMode"), mode);
    applyPersisted();
    emit changed();  // 热切：全 UI 重着色
}

QString themeModePreference()
{
    return QSettings().value(QStringLiteral("ui/themeMode"), QStringLiteral("system")).toString();
}

void applyPersistedThemeMode()
{
    ThemeManager::instance().applyPersisted();
}

void setThemeModePreference(const QString& mode)
{
    ThemeManager::instance().setMode(mode);  // 持久化 + 热切
}

int fontScalePreference()
{
    return QSettings().value(QStringLiteral("ui/fontScale"), 100).toInt();
}

void setFontScalePreference(int percent)
{
    QSettings().setValue(QStringLiteral("ui/fontScale"), percent);  // 重启后生效
}

void applyPersistedFontScale()
{
    g_fontScale = fontScalePreference();
    QFont f = qApp->font();
    f.setPixelSize(kBaseFontPx * g_fontScale / 100);
    qApp->setFont(f);
}

int scaledPx(int basePx)
{
    return basePx * g_fontScale / 100;
}

bool isDarkTheme()
{
    return ThemeManager::instance().isDark();
}

void vtkBackground(double& r, double& g, double& b)
{
    // 规范 §0.5/§11：数据画布永远深色，不随明暗切换。取 canvas/bg。
    const QColor c = tokenColor("canvas/bg");  // #0B1320
    r = c.redF();
    g = c.greenF();
    b = c.blueF();
}

QString token(const char* name) { return tokenHex(name, isDarkTheme()); }

QColor tokenColor(const char* name) { return QColor(token(name)); }

QString fillTokens(const QString& tmpl)
{
    const bool dark = isDarkTheme();
    QString s = tmpl;
    for (const auto& t : kTokens)
        s.replace(QStringLiteral("{{%1}}").arg(QLatin1String(t.name)),
                  QString::fromLatin1(dark ? t.dark : t.light));
    return s;
}

void applyTokenizedStyleSheet(QWidget* w, const QString& tmpl)
{
    if (!w) return;
    w->setStyleSheet(fillTokens(tmpl));
    QObject::connect(&ThemeManager::instance(), &ThemeManager::changed, w,
                     [w, tmpl]() { w->setStyleSheet(fillTokens(tmpl)); });
}

}  // namespace geopro::app