#include "desktop_list_page.h"

#include <QFont>
#include <QFrame>
#include <QHBoxLayout>
#include <QLabel>
#include <QPushButton>
#include <QScrollArea>
#include <QVBoxLayout>

namespace vdi {
namespace {

// 在信息行里加一个拉伸占位（独立函数避免在类外重复声明）
void addStretchToRow(QHBoxLayout* row) {
    row->addStretch(1);
}

}  // namespace

DesktopListPage::DesktopListPage(QWidget* parent) : QWidget(parent) {
    auto* root = new QVBoxLayout(this);
    root->setContentsMargins(80, 50, 80, 40);
    root->setSpacing(16);

    // ---- 标题区 ----
    auto* title = new QLabel(QStringLiteral("选择云桌面"), this);
    QFont titleFont = title->font();
    titleFont.setPointSize(26);
    titleFont.setBold(true);
    title->setFont(titleFont);
    title->setAlignment(Qt::AlignCenter);
    root->addWidget(title);

    auto* infoRow = new QHBoxLayout();
    labelUser_ = new QLabel(this);
    labelUser_->setStyleSheet(QStringLiteral("color: #8a94a6;"));
    // 无登录页演示模式下不设"退出登录"（用户身份由设备/平台承担，
    // 正式认证接入后由 DesktopService 驱动恢复登录流程）
    infoRow->addWidget(labelUser_);
    addStretchToRow(infoRow);
    root->addLayout(infoRow);

    // ---- 卡片区 ----
    auto* scroll = new QScrollArea(this);
    scroll->setWidgetResizable(true);
    scroll->setFrameShape(QFrame::NoFrame);
    scroll->setStyleSheet(QStringLiteral(
        "QScrollArea { background: transparent; }"
        "QWidget { background: transparent; }"));

    auto* cardsHost = new QWidget(scroll);
    cardsLayout_ = new QVBoxLayout(cardsHost);
    cardsLayout_->setSpacing(14);
    cardsLayout_->addStretch(1);
    scroll->setWidget(cardsHost);
    root->addWidget(scroll, 1);

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

void DesktopListPage::setDesktops(const std::vector<DesktopInfo>& desktops) {
    desktops_ = desktops;
    rebuildCards();
}

void DesktopListPage::rebuildCards() {
    actionButtons_.clear();

    // 清空旧卡片（最后一项是 stretch）
    while (cardsLayout_->count() > 1) {
        QLayoutItem* item = cardsLayout_->takeAt(0);
        if (item->widget()) {
            item->widget()->deleteLater();
        }
        delete item;
    }

    for (const DesktopInfo& d : desktops_) {
        auto* card = new QFrame(this);
        card->setMinimumHeight(96);
        card->setStyleSheet(QStringLiteral(
            "QFrame { background: #1a2233; border: 1px solid #2b3654; border-radius: 10px; }"
            "QFrame:hover { border: 1px solid #2f6feb; }"
            "QLabel { border: none; background: transparent; }"));

        auto* row = new QHBoxLayout(card);
        row->setContentsMargins(24, 16, 24, 16);
        row->setSpacing(18);

        auto* textCol = new QVBoxLayout();
        textCol->setSpacing(4);
        auto* name = new QLabel(d.name, card);
        QFont nameFont = name->font();
        nameFont.setPointSize(15);
        nameFont.setBold(true);
        name->setFont(nameFont);
        auto* osLine = new QLabel(d.os, card);
        osLine->setStyleSheet(QStringLiteral("color: #8a94a6;"));
        textCol->addWidget(name);
        textCol->addWidget(osLine);
        row->addLayout(textCol, 1);

        // 状态标签（会话通道统一 Moonlight，无需按桌面标注协议）
        QString stateText;
        QString stateColor;
        switch (d.state) {
            case DesktopState::kAvailable:
                stateText = QStringLiteral("可连接");
                stateColor = QStringLiteral("#3fb950");
                break;
            case DesktopState::kPending:
                stateText = QStringLiteral("任务进行中");
                stateColor = QStringLiteral("#d29922");
                break;
            case DesktopState::kUnassigned:
                stateText = QStringLiteral("待分配");
                stateColor = QStringLiteral("#8a94a6");
                break;
        }
        auto* state = new QLabel(stateText, card);
        state->setStyleSheet(QStringLiteral("color: %1; font-weight: bold;").arg(stateColor));
        row->addWidget(state);

        // “设置”：每张卡都可编辑连接参数（协议/地址/应用名/分辨率/帧率）
        auto* editBtn = new QPushButton(QStringLiteral("设置"), card);
        editBtn->setMinimumSize(88, 42);
        editBtn->setEnabled(!busy_);
        actionButtons_.push_back(editBtn);
        connect(editBtn, &QPushButton::clicked, this, [this, id = d.id]() {
            if (!busy_) {
                emit editRequested(id);
            }
        });
        row->addWidget(editBtn);

        if (d.state == DesktopState::kAvailable) {
            auto* connectBtn = new QPushButton(QStringLiteral("连接"), card);
            connectBtn->setMinimumSize(110, 42);
            connectBtn->setStyleSheet(QStringLiteral(
                "QPushButton { background: #2f6feb; color: white; border: none; "
                "border-radius: 6px; font-weight: bold; }"
                "QPushButton:disabled { background: #3a4a63; }"));
            connectBtn->setEnabled(!busy_);
            actionButtons_.push_back(connectBtn);
            connect(connectBtn, &QPushButton::clicked, this, [this, id = d.id]() {
                if (!busy_) {
                    setBusy(true);
                    setStatus(QStringLiteral("正在连接，请稍候…"));
                    emit desktopSelected(id);
                }
            });
            row->addWidget(connectBtn);
        } else {
            auto* btn = new QPushButton(QStringLiteral("连接"), card);
            btn->setMinimumSize(110, 42);
            btn->setEnabled(false);
            row->addWidget(btn);
        }

        cardsLayout_->insertWidget(cardsLayout_->count() - 1, card);
    }
}

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

void DesktopListPage::setBusy(bool busy) {
    busy_ = busy;
    for (QPushButton* button : actionButtons_) {
        if (button) {
            button->setEnabled(!busy_);
        }
    }
}

QString DesktopListPage::currentUser() const {
    return currentUser_;
}

void DesktopListPage::setCurrentUser(const QString& user) {
    currentUser_ = user;
    labelUser_->setText(user.isEmpty()
                            ? QStringLiteral("当前用户：未登录")
                            : QStringLiteral("当前用户：%1").arg(user));
}

}  // namespace vdi