#include "FileLogWindow.h"

#include <QHBoxLayout>
#include <QHeaderView>
#include <QVBoxLayout>

#include "dao/GeneralLogDAO.h"

static constexpr int COL_ID      = 0;
static constexpr int COL_TIME    = 1;
static constexpr int COL_LEVEL   = 2;
static constexpr int COL_SOURCE  = 3;
static constexpr int COL_MESSAGE = 4;

FileLogWindow::FileLogWindow(QWidget *parent) : QDialog(parent) {
    setWindowTitle("Логи");
    resize(1100, 600);

    m_table = new QTableWidget(this);
    m_table->setColumnCount(5);
    m_table->setHorizontalHeaderLabels({"#", "Время", "Уровень", "Источник", "Сообщение"});
    m_table->setEditTriggers(QAbstractItemView::NoEditTriggers);
    m_table->setSelectionBehavior(QAbstractItemView::SelectRows);
    m_table->setSelectionMode(QAbstractItemView::SingleSelection);
    m_table->verticalHeader()->hide();
    m_table->horizontalHeader()->setStretchLastSection(true);
    m_table->setColumnWidth(COL_ID,     45);
    m_table->setColumnWidth(COL_TIME,   145);
    m_table->setColumnWidth(COL_LEVEL,  80);
    m_table->setColumnWidth(COL_SOURCE, 250);

    m_showAllCheck = new QCheckBox("Показать все (включая DEBUG/INFO)", this);

    m_prevBtn   = new QPushButton("←", this);
    m_nextBtn   = new QPushButton("→", this);
    m_pageLabel = new QLabel(this);
    m_pageLabel->setAlignment(Qt::AlignCenter);
    m_pageLabel->setMinimumWidth(140);

    auto *refreshBtn = new QPushButton("Обновить", this);

    auto *paginationLayout = new QHBoxLayout;
    paginationLayout->addWidget(m_prevBtn);
    paginationLayout->addWidget(m_pageLabel);
    paginationLayout->addWidget(m_nextBtn);
    paginationLayout->addStretch();
    paginationLayout->addWidget(m_showAllCheck);
    paginationLayout->addWidget(refreshBtn);

    auto *mainLayout = new QVBoxLayout(this);
    mainLayout->addWidget(m_table, 1);
    mainLayout->addLayout(paginationLayout);

    connect(m_prevBtn, &QPushButton::clicked, this, [this]() {
        if (m_page > 0) { --m_page; loadPage(); }
    });
    connect(m_nextBtn, &QPushButton::clicked, this, [this]() {
        if (m_page < m_totalPages - 1) { ++m_page; loadPage(); }
    });
    connect(refreshBtn, &QPushButton::clicked, this, [this]() {
        m_page = 0;
        loadPage();
    });
    connect(m_showAllCheck, &QCheckBox::toggled, this, [this]() {
        m_page = 0;
        loadPage();
    });

    loadPage();
}

QStringList FileLogWindow::currentLevelFilter() const {
    if (m_showAllCheck->isChecked())
        return {};
    return {"WARNING", "CRITICAL", "FATAL"};
}

void FileLogWindow::loadPage() {
    const QStringList levels = currentLevelFilter();
    const int total = GeneralLogDAO::getTotalCount(levels);
    m_totalPages = qMax(1, (total + m_pageSize - 1) / m_pageSize);
    m_page = qBound(0, m_page, m_totalPages - 1);

    const QList<GeneralLogEntry> entries = GeneralLogDAO::getLogs(m_page, m_pageSize, levels);

    m_table->setRowCount(static_cast<int>(entries.size()));
    for (int i = 0; i < entries.size(); ++i) {
        const auto &e = entries[i];
        m_table->setItem(i, COL_ID,      new QTableWidgetItem(QString::number(e.id)));
        m_table->setItem(i, COL_TIME,    new QTableWidgetItem(
            e.timestamp.toLocalTime().toString("dd.MM.yy HH:mm:ss")));
        m_table->setItem(i, COL_LEVEL,   new QTableWidgetItem(e.level));
        m_table->setItem(i, COL_SOURCE,  new QTableWidgetItem(e.source));
        m_table->setItem(i, COL_MESSAGE, new QTableWidgetItem(e.message));
    }

    updatePagination();
}

void FileLogWindow::updatePagination() {
    m_pageLabel->setText(QString("Страница %1 из %2").arg(m_page + 1).arg(m_totalPages));
    m_prevBtn->setEnabled(m_page > 0);
    m_nextBtn->setEnabled(m_page < m_totalPages - 1);
}