#include "panels/DescriptionPanel.hpp"

#include <QColorDialog>
#include <QComboBox>
#include <QHBoxLayout>
#include <QPushButton>
#include <QTextCharFormat>
#include <QTextEdit>
#include <QTextListFormat>
#include <QToolBar>
#include <QToolButton>
#include <QVBoxLayout>

#include "Theme.hpp"
#include "panels/QuillDelta.hpp"

namespace geopro::app {
namespace {

// 字号下拉选项（px）——对照原版 ql-size 的 12~32px。
const int kFontSizesPx[] = {12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32};

}  // namespace

DescriptionPanel::DescriptionPanel(QWidget* parent) : QWidget(parent) {
    auto* lay = new QVBoxLayout(this);
    lay->setContentsMargins(geopro::app::space::kMd, geopro::app::space::kMd,
                            geopro::app::space::kMd, geopro::app::space::kMd);
    lay->setSpacing(geopro::app::space::kSm);

    auto* tb = new QToolBar(this);
    buildToolbar(tb);
    lay->addWidget(tb);

    edit_ = new QTextEdit(this);
    edit_->setAcceptRichText(true);
    edit_->setPlaceholderText(QStringLiteral("暂无描述"));
    lay->addWidget(edit_, 1);

    auto* btnLay = new QHBoxLayout();
    btnLay->addStretch();
    saveBtn_ = new QPushButton(QStringLiteral("保存"), this);
    saveBtn_->setEnabled(false);  // 注入 cmdRepo 后启用
    btnLay->addWidget(saveBtn_);
    lay->addLayout(btnLay);

    connect(saveBtn_, &QPushButton::clicked, this, [this]() { emit saveRequested(); });
}

void DescriptionPanel::buildToolbar(QToolBar* tb) {
    // 粗体 / 斜体 / 下划线：可勾选按钮，作用于选区当前字符格式。
    auto addToggle = [this, tb](const QString& label, auto applier) {
        auto* btn = new QToolButton(tb);
        btn->setText(label);
        btn->setCheckable(true);
        tb->addWidget(btn);
        connect(btn, &QToolButton::toggled, this, applier);
        return btn;
    };
    addToggle(QStringLiteral("B"), [this](bool on) {
        QTextCharFormat f;
        f.setFontWeight(on ? QFont::Bold : QFont::Normal);
        edit_->mergeCurrentCharFormat(f);
    });
    addToggle(QStringLiteral("I"), [this](bool on) {
        QTextCharFormat f;
        f.setFontItalic(on);
        edit_->mergeCurrentCharFormat(f);
    });
    addToggle(QStringLiteral("U"), [this](bool on) {
        QTextCharFormat f;
        f.setFontUnderline(on);
        edit_->mergeCurrentCharFormat(f);
    });

    // 字色：弹色板，作用于选区前景色。
    auto* colorBtn = new QToolButton(tb);
    colorBtn->setText(QStringLiteral("A"));
    tb->addWidget(colorBtn);
    connect(colorBtn, &QToolButton::clicked, this, [this]() {
        const QColor c = QColorDialog::getColor(Qt::black, this, QStringLiteral("字体颜色"));
        if (!c.isValid()) return;
        QTextCharFormat f;
        f.setForeground(c);
        edit_->mergeCurrentCharFormat(f);
    });

    // 字号下拉（px）。
    auto* sizeBox = new QComboBox(tb);
    for (int px : kFontSizesPx) sizeBox->addItem(QStringLiteral("%1px").arg(px), px);
    sizeBox->setCurrentIndex(2);  // 默认 16px（与原版一致）。
    tb->addWidget(sizeBox);
    connect(sizeBox, &QComboBox::currentIndexChanged, this, [this, sizeBox](int) {
        const int px = sizeBox->currentData().toInt();
        QTextCharFormat f;
        f.setFontPointSize(px * 3.0 / 4.0);  // px→pt。
        edit_->mergeCurrentCharFormat(f);
    });

    // 标题下拉（正文 / H1~H4）——块级，作用于当前段。
    auto* headerBox = new QComboBox(tb);
    headerBox->addItem(QStringLiteral("正文"), 0);
    for (int h = 1; h <= 4; ++h) headerBox->addItem(QStringLiteral("标题%1").arg(h), h);
    tb->addWidget(headerBox);
    connect(headerBox, &QComboBox::currentIndexChanged, this, [this, headerBox](int) {
        const int h = headerBox->currentData().toInt();
        QTextCursor cur = edit_->textCursor();
        QTextBlockFormat bf = cur.blockFormat();
        bf.setHeadingLevel(h);  // 0 表示正文。
        cur.mergeBlockFormat(bf);
        edit_->setTextCursor(cur);
    });

    // 有序 / 无序列表——块级。
    auto addListBtn = [this, tb](const QString& label, QTextListFormat::Style style) {
        auto* btn = new QToolButton(tb);
        btn->setText(label);
        tb->addWidget(btn);
        connect(btn, &QToolButton::clicked, this, [this, style]() {
            edit_->textCursor().createList(style);
        });
    };
    addListBtn(QStringLiteral("1."), QTextListFormat::ListDecimal);
    addListBtn(QStringLiteral("•"), QTextListFormat::ListDisc);
}

void DescriptionPanel::setDelta(const QJsonArray& ops) {
    if (ops.isEmpty()) return;
    deltaToDocument(ops, *edit_->document());
}

void DescriptionPanel::setPlainText(const QString& text) { edit_->setPlainText(text); }

QJsonArray DescriptionPanel::delta() const { return documentToDelta(*edit_->document()); }

QString DescriptionPanel::plainText() const { return edit_->toPlainText(); }

void DescriptionPanel::setSaveEnabled(bool on) { saveBtn_->setEnabled(on); }

}  // namespace geopro::app