#include "screens/info/PrivacyScreen.h"

#include "ui/theme/Theme.h"

#include <QEvent>
#include <QGridLayout>
#include <QHBoxLayout>
#include <QLabel>
#include <QPushButton>
#include <QScrollArea>
#include <QVBoxLayout>

namespace fincept::screens {

using namespace fincept::ui;

static const char* MF = "font-family:'Consolas','Courier New',monospace;";

static QLabel* section_heading(const QString& icon, const QString& title) {
    auto* lbl = new QLabel(QString("%1  %2").arg(icon, title));
    lbl->setStyleSheet(QString("color: %1; font-size: 14px; font-weight: 700; "
                               "background: transparent; margin-top: 8px; %2")
                           .arg(colors::AMBER(), MF));
    return lbl;
}

static QLabel* body_text(const QString& text) {
    auto* lbl = new QLabel(text);
    lbl->setWordWrap(true);
    lbl->setStyleSheet(
        QString("color: %1; font-size: 12px; background: transparent; %2").arg(colors::TEXT_PRIMARY(), MF));
    return lbl;
}

static QLabel* bullet(const QString& text) {
    auto* lbl = new QLabel(QString("  > %1").arg(text));
    lbl->setWordWrap(true);
    lbl->setStyleSheet(
        QString("color: %1; font-size: 12px; background: transparent; %2").arg(colors::TEXT_SECONDARY(), MF));
    return lbl;
}

static QWidget* info_card(const QString& title, const QString& desc) {
    auto* card = new QWidget(nullptr);
    card->setStyleSheet(QString("background: %1; border: 1px solid %2; border-radius: 2px;")
                            .arg(colors::BG_SURFACE(), colors::BORDER_DIM()));
    auto* vl = new QVBoxLayout(card);
    vl->setContentsMargins(12, 10, 12, 10);
    vl->setSpacing(4);

    auto* t = new QLabel(title);
    t->setStyleSheet(
        QString("color: %1; font-size: 11px; font-weight: 700; background: transparent; %2").arg(colors::AMBER(), MF));
    vl->addWidget(t);

    auto* d = new QLabel(desc);
    d->setWordWrap(true);
    d->setStyleSheet(
        QString("color: %1; font-size: 11px; background: transparent; %2").arg(colors::TEXT_SECONDARY(), MF));
    vl->addWidget(d);

    return card;
}

PrivacyScreen::PrivacyScreen(QWidget* parent) : QWidget(parent) {
    setStyleSheet(QString("QWidget#PrivacyRoot { background: %1; }").arg(colors::BG_BASE()));
    setObjectName("PrivacyRoot");

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

    scroll_ = new QScrollArea;
    scroll_->setWidgetResizable(true);
    scroll_->setStyleSheet("QScrollArea { border: none; background: transparent; }");
    scroll_->setWidget(build_page());
    root->addWidget(scroll_, 1);
}

// ── Re-translation ────────────────────────────────────────────────────────────
// Static legal text — rebuild the page on language change rather than caching
// every label as a member. QScrollArea::setWidget() deletes the old content.

void PrivacyScreen::changeEvent(QEvent* event) {
    if (event->type() == QEvent::LanguageChange && scroll_) {
        scroll_->setWidget(build_page());
    }
    QWidget::changeEvent(event);
}

// ── Page builder ──────────────────────────────────────────────────────────────

QWidget* PrivacyScreen::build_page() {
    auto* page = new QWidget(this);
    page->setStyleSheet(QString("background: %1;").arg(colors::BG_BASE()));
    auto* vl = new QVBoxLayout(page);
    vl->setContentsMargins(24, 24, 24, 24);
    vl->setSpacing(6);

    // Back
    auto* back_btn = new QPushButton(tr("< BACK"));
    back_btn->setCursor(Qt::PointingHandCursor);
    back_btn->setStyleSheet(QString("QPushButton { color: %1; background: transparent; border: none; "
                                    "font-size: 12px; %2 } QPushButton:hover { color: %3; }")
                                .arg(colors::TEXT_SECONDARY(), MF, colors::TEXT_PRIMARY()));
    connect(back_btn, &QPushButton::clicked, this, &PrivacyScreen::navigate_back);
    vl->addWidget(back_btn, 0, Qt::AlignLeft);

    auto* title = new QLabel(tr("PRIVACY POLICY"));
    title->setStyleSheet(QString("color: %1; font-size: 20px; font-weight: 700; letter-spacing: 1px; "
                                 "background: transparent; %2")
                             .arg(colors::AMBER(), MF));
    vl->addWidget(title);

    auto* updated = new QLabel(tr("Last updated: January 1, 2026"));
    updated->setStyleSheet(
        QString("color: %1; font-size: 11px; background: transparent; %2").arg(colors::TEXT_TERTIARY(), MF));
    vl->addWidget(updated);
    vl->addSpacing(12);

    // Main panel
    auto* panel = new QWidget(this);
    panel->setStyleSheet(QString("background: %1; border: 1px solid %2; border-radius: 2px;")
                             .arg(colors::BG_SURFACE(), colors::BORDER_DIM()));
    auto* pvl = new QVBoxLayout(panel);
    pvl->setContentsMargins(20, 16, 20, 16);
    pvl->setSpacing(6);

    // 1 — Commitment
    pvl->addWidget(section_heading("#", tr("OUR COMMITMENT TO PRIVACY")));
    pvl->addWidget(
        body_text(tr("At Fincept Corporation, we are committed to protecting your privacy. This policy describes "
                     "how we collect, use, and safeguard your personal information when you use Fincept Terminal.")));

    // 2 — Information We Collect
    pvl->addWidget(section_heading("@", tr("INFORMATION WE COLLECT")));
    pvl->addWidget(body_text(tr("Personal Information:")));
    pvl->addWidget(bullet(tr("Name and email address")));
    pvl->addWidget(bullet(tr("Account credentials (encrypted)")));
    pvl->addWidget(bullet(tr("Payment information (processed by third-party providers)")));
    pvl->addWidget(bullet(tr("Phone number (optional)")));
    pvl->addWidget(bullet(tr("Country and region")));

    pvl->addSpacing(4);
    pvl->addWidget(body_text(tr("Usage Information:")));
    pvl->addWidget(bullet(tr("Feature usage and navigation patterns")));
    pvl->addWidget(bullet(tr("Device and browser information")));
    pvl->addWidget(bullet(tr("IP address and approximate location")));
    pvl->addWidget(bullet(tr("Error logs and performance metrics")));
    pvl->addWidget(bullet(tr("Session duration and frequency")));

    // 3 — How We Use
    pvl->addWidget(section_heading("*", tr("HOW WE USE YOUR INFORMATION")));
    {
        auto* grid = new QGridLayout;
        grid->setSpacing(8);
        grid->addWidget(
            info_card(tr("SERVICE DELIVERY"),
                      tr("Provide and maintain terminal features, process transactions, and deliver data feeds")),
            0, 0);
        grid->addWidget(
            info_card(tr("SECURITY"),
                      tr("Protect accounts, detect fraud, enforce terms of service, and ensure platform integrity")),
            0, 1);
        grid->addWidget(
            info_card(tr("COMMUNICATION"),
                      tr("Send service updates, security alerts, support responses, and optional marketing")),
            1, 0);
        grid->addWidget(info_card(tr("IMPROVEMENT"),
                                  tr("Analyze usage to improve features, fix bugs, and develop new capabilities")),
                        1, 1);
        pvl->addLayout(grid);
    }

    // 4 — Sharing
    pvl->addWidget(section_heading("~", tr("INFORMATION SHARING")));
    pvl->addWidget(body_text(tr("We may share your information with:")));
    pvl->addWidget(bullet(tr("Service Providers — third-party services that help operate the platform")));
    pvl->addWidget(bullet(tr("Legal Requirements — when required by law or to protect our rights")));
    pvl->addWidget(bullet(tr("Business Transfer — in connection with a merger, acquisition, or sale")));
    pvl->addWidget(bullet(tr("With Your Consent — when you explicitly authorize sharing")));

    // 5 — Security
    pvl->addWidget(section_heading("!", tr("DATA SECURITY")));
    pvl->addWidget(body_text(tr("We implement industry-standard security measures:")));
    pvl->addWidget(bullet(tr("End-to-end encryption for sensitive data")));
    pvl->addWidget(bullet(tr("Secure credential storage (encrypted at rest)")));
    pvl->addWidget(bullet(tr("Regular security audits and penetration testing")));
    pvl->addWidget(bullet(tr("Access controls and authentication requirements")));
    pvl->addWidget(bullet(tr("Automatic session expiry and logout")));
    pvl->addWidget(bullet(tr("HTTPS/TLS for all data transmission")));

    // 6 — Rights
    pvl->addWidget(section_heading("=", tr("YOUR RIGHTS")));
    pvl->addWidget(body_text(tr("You have the right to:")));
    pvl->addWidget(bullet(tr("Access — Request a copy of your personal data")));
    pvl->addWidget(bullet(tr("Correction — Update inaccurate or incomplete data")));
    pvl->addWidget(bullet(tr("Deletion — Request deletion of your account and data")));
    pvl->addWidget(bullet(tr("Portability — Export your data in a machine-readable format")));
    pvl->addWidget(bullet(tr("Opt-out — Unsubscribe from marketing communications")));

    // 7 — Contact
    pvl->addWidget(section_heading("@", tr("CONTACT US")));
    pvl->addWidget(body_text(tr("Privacy Officer: support@fincept.in")));
    pvl->addWidget(body_text(tr("For privacy-related inquiries, write to the address above.")));

    vl->addWidget(panel);

    // Footer navigation
    auto* footer = new QWidget(this);
    footer->setStyleSheet("background: transparent;");
    auto* fhl = new QHBoxLayout(footer);
    fhl->setContentsMargins(0, 12, 0, 0);

    auto make_link = [](const QString& text) {
        auto* btn = new QPushButton(text);
        btn->setCursor(Qt::PointingHandCursor);
        btn->setStyleSheet(QString("QPushButton { color: %1; background: transparent; border: none; "
                                   "font-size: 12px; font-family:'Consolas','Courier New',monospace; }"
                                   "QPushButton:hover { color: #38bdf8; }")
                               .arg(colors::CYAN()));
        return btn;
    };

    auto* terms_link = make_link(tr("Terms of Service"));
    connect(terms_link, &QPushButton::clicked, this, &PrivacyScreen::navigate_terms);
    fhl->addWidget(terms_link);

    fhl->addStretch();

    auto* contact_link = make_link(tr("Contact Us"));
    connect(contact_link, &QPushButton::clicked, this, &PrivacyScreen::navigate_contact);
    fhl->addWidget(contact_link);

    vl->addWidget(footer);
    vl->addStretch();

    return page;
}

} // namespace fincept::screens