#include "dialogs/BlackholeResolveDialog.h"

#include <QDialogButtonBox>
#include <QFrame>
#include <QLabel>
#include <QPlainTextEdit>
#include <QPushButton>
#include <QStackedWidget>
#include <QVBoxLayout>

namespace {

QPushButton* makeAlgoButton(const QString& title, QWidget* parent) {
    auto* btn = new QPushButton(parent);
    btn->setCheckable(false);
    btn->setCursor(Qt::PointingHandCursor);
    btn->setMinimumHeight(48);
    btn->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Fixed);
    btn->setText(title);
    btn->setStyleSheet(
        "QPushButton { text-align: left; padding: 10px 12px; border: 1px solid palette(mid); border-radius: 8px; }"
        "QPushButton:hover { border-color: palette(highlight); }");
    return btn;
}

}  // namespace

QString BlackholeResolveDialog::defaultModelInpaintPrompt() {
    return QStringLiteral(
        "中国画局部，需去除人物并只补背景：请严格依据掩膜外已见的笔墨皴擦、设色层次、留白与纸绢肌理，"
        "在掩膜内自然延展，补全为山石、坡岸、云水、苔点或空灵留白等，与外缘笔法、墨色与气韵连贯衔接；"
        "禁止出现人物轮廓、肢体、衣褶、五官、手足、发丝、肤色、投影及去人后的模糊晕带、鬼影边缘与色块台阶，"
        "整体须像原画从未画入人物一样自然，不留修补感。");
}

BlackholeResolveDialog::BlackholeResolveDialog(const QString& blackholeName, QWidget* parent)
    : QDialog(parent),
      m_blackholeName(blackholeName) {
    setModal(true);
    setMinimumSize(400, 320);
    setWindowTitle(QStringLiteral("修复 · %1").arg(m_blackholeName));

    auto* root = new QVBoxLayout(this);
    m_pages = new QStackedWidget(this);
    root->addWidget(m_pages, 1);

    buildSelectPage();
    buildDetailPage();
    m_pages->setCurrentWidget(m_pageSelect);
}

QString BlackholeResolveDialog::promptText() const {
    return m_promptEdit ? m_promptEdit->toPlainText().trimmed() : QString();
}

void BlackholeResolveDialog::buildSelectPage() {
    m_pageSelect = new QWidget(this);
    auto* layout = new QVBoxLayout(m_pageSelect);
    layout->setContentsMargins(8, 8, 8, 8);
    layout->setSpacing(12);

    auto* title = new QLabel(QStringLiteral("方式"), m_pageSelect);
    title->setStyleSheet("font-size: 16px; font-weight: 600;");
    layout->addWidget(title);

    auto* btnCopy = makeAlgoButton(QStringLiteral("复制背景"), m_pageSelect);
    auto* btnOriginal = makeAlgoButton(QStringLiteral("原始背景"), m_pageSelect);
    auto* btnModel = makeAlgoButton(QStringLiteral("模型补全"), m_pageSelect);
    layout->addWidget(btnCopy);
    layout->addWidget(btnOriginal);
    layout->addWidget(btnModel);

    layout->addStretch(1);

    auto* btns = new QDialogButtonBox(QDialogButtonBox::Cancel, m_pageSelect);
    connect(btns, &QDialogButtonBox::rejected, this, &QDialog::reject);
    layout->addWidget(btns);

    connect(btnCopy, &QPushButton::clicked, this, [this]() {
        enterAlgorithmPage(Algorithm::CopyBackgroundRegion);
    });
    connect(btnOriginal, &QPushButton::clicked, this, [this]() {
        enterAlgorithmPage(Algorithm::UseOriginalBackground);
    });
    connect(btnModel, &QPushButton::clicked, this, [this]() {
        enterAlgorithmPage(Algorithm::ModelInpaint);
    });

    m_pages->addWidget(m_pageSelect);
}

void BlackholeResolveDialog::buildDetailPage() {
    m_pageDetail = new QWidget(this);
    auto* layout = new QVBoxLayout(m_pageDetail);
    layout->setContentsMargins(8, 8, 8, 8);
    layout->setSpacing(10);

    m_detailTitle = new QLabel(m_pageDetail);
    m_detailTitle->setStyleSheet("font-size: 15px; font-weight: 600;");
    layout->addWidget(m_detailTitle);

    m_algoDetails = new QStackedWidget(m_pageDetail);

    // 详情页 A：复制背景其他区域（交互布局）
    m_copyDetail = new QWidget(m_algoDetails);
    {
        auto* cLay = new QVBoxLayout(m_copyDetail);
        cLay->setSpacing(8);

        auto* panel = new QFrame(m_copyDetail);
        panel->setFrameShape(QFrame::StyledPanel);
        auto* pLay = new QVBoxLayout(panel);
        pLay->setSpacing(8);

        auto* tip = new QLabel(QStringLiteral("应用后在画布拖取样框。"), panel);
        tip->setStyleSheet("color: palette(mid);");
        pLay->addWidget(tip);
        cLay->addWidget(panel);
        cLay->addStretch(1);
    }

    // 详情页 B：使用原始背景（确认布局）
    m_originalDetail = new QWidget(m_algoDetails);
    {
        auto* oLay = new QVBoxLayout(m_originalDetail);
        oLay->setSpacing(8);
        auto* desc = new QLabel(QStringLiteral("仅隐藏黑洞，不改动背景文件。"), m_originalDetail);
        desc->setWordWrap(true);
        oLay->addWidget(desc);
        oLay->addStretch(1);
    }

    // 详情页 C：模型补全（提示词）
    m_modelDetail = new QWidget(m_algoDetails);
    {
        auto* mLay = new QVBoxLayout(m_modelDetail);
        mLay->setSpacing(8);

        auto* panel = new QFrame(m_modelDetail);
        panel->setFrameShape(QFrame::StyledPanel);
        auto* pLay = new QVBoxLayout(panel);
        pLay->setSpacing(8);

        m_promptEdit = new QPlainTextEdit(panel);
        m_promptEdit->setPlainText(BlackholeResolveDialog::defaultModelInpaintPrompt());
        m_promptEdit->setPlaceholderText(QStringLiteral("可按画面增删；若全部删空，请求时仍使用内置默认描述"));
        m_promptEdit->setMinimumHeight(72);
        pLay->addWidget(m_promptEdit);

        mLay->addWidget(panel);
        mLay->addStretch(1);
    }

    m_algoDetails->addWidget(m_copyDetail);
    m_algoDetails->addWidget(m_originalDetail);
    m_algoDetails->addWidget(m_modelDetail);
    layout->addWidget(m_algoDetails, 1);

    auto* btns = new QDialogButtonBox(m_pageDetail);
    auto* btnBack = btns->addButton(QStringLiteral("返回"), QDialogButtonBox::ActionRole);
    auto* btnApply = btns->addButton(QStringLiteral("确定"), QDialogButtonBox::AcceptRole);
    auto* btnCancel = btns->addButton(QDialogButtonBox::Cancel);
    connect(btnBack, &QPushButton::clicked, this, [this]() {
        m_pages->setCurrentWidget(m_pageSelect);
    });
    connect(btnApply, &QPushButton::clicked, this, &QDialog::accept);
    connect(btnCancel, &QPushButton::clicked, this, &QDialog::reject);
    layout->addWidget(btns);

    m_pages->addWidget(m_pageDetail);
}

void BlackholeResolveDialog::enterAlgorithmPage(Algorithm algo) {
    m_selectedAlgorithm = algo;
    if (algo == Algorithm::CopyBackgroundRegion) {
        m_detailTitle->setText(QStringLiteral("复制背景"));
        m_algoDetails->setCurrentWidget(m_copyDetail);
    } else if (algo == Algorithm::UseOriginalBackground) {
        m_detailTitle->setText(QStringLiteral("原始背景"));
        m_algoDetails->setCurrentWidget(m_originalDetail);
    } else {
        m_detailTitle->setText(QStringLiteral("模型补全"));
        m_algoDetails->setCurrentWidget(m_modelDetail);
    }
    m_pages->setCurrentWidget(m_pageDetail);
}