#include "core/VaultSettings.h"

#include <QDir>
#include <QFile>
#include <QJsonDocument>
#include <QJsonObject>

namespace {

QString cleanJournalDir(const QString &d)
{
    QString t = d.trimmed();
    t.replace(QLatin1Char('\\'), QLatin1Char('/'));
    // только один сегмент, без выхода наверх и служебных имён
    while (t.startsWith(QLatin1Char('/')))
        t.remove(0, 1);
    while (t.endsWith(QLatin1Char('/')) && t.size() > 1)
        t.chop(1);
    if (t.isEmpty() || t == "." || t == ".." || t.contains(QLatin1String(".."))
        || t.contains(QLatin1Char('/')) || t.startsWith(QLatin1Char('.')))
        return QStringLiteral("Журнал");
    return t;
}

} // namespace

VaultSettings::VaultSettings(QObject *parent)
    : QObject(parent)
{
}

void VaultSettings::setJournalDir(const QString &d)
{
    const QString clean = cleanJournalDir(d);
    if (m_journalDir == clean)
        return;
    m_journalDir = clean;
    emit changed();
}

void VaultSettings::setSqlEnabled(bool on)
{
    if (m_sqlEnabled == on)
        return;
    m_sqlEnabled = on;
    emit changed();
}

void VaultSettings::setSqlMaxRows(int n)
{
    if (n < 5)
        n = 5;
    if (n > 500)
        n = 500;
    if (m_sqlMaxRows == n)
        return;
    m_sqlMaxRows = n;
    emit changed();
}

QString VaultSettings::settingsPath() const
{
    if (m_vault.isEmpty())
        return QString();
    return QDir(m_vault).filePath(QStringLiteral(".flora/settings.json"));
}

bool VaultSettings::open(const QString &vaultPath)
{
    const QString clean = QDir::cleanPath(vaultPath.trimmed());
    if (clean.isEmpty() || !QDir(clean).exists())
        return false;
    if (m_vault != clean) {
        m_vault = clean;
        emit vaultChanged();
    }
    resetDefaults();
    QFile f(settingsPath());
    if (!f.exists())
        return true; // нет файла — дефолты, это нормально
    if (!f.open(QIODevice::ReadOnly))
        return false;
    QJsonParseError perr{};
    const QJsonDocument doc = QJsonDocument::fromJson(f.readAll(), &perr);
    if (perr.error != QJsonParseError::NoError || !doc.isObject())
        return false;
    const QJsonObject o = doc.object();
    // Через сеттеры — с валидацией и без лишних сигналов
    setJournalDir(o.value(QStringLiteral("journalDir")).toString(m_journalDir));
    if (o.contains(QStringLiteral("sqlEnabled")))
        setSqlEnabled(o.value(QStringLiteral("sqlEnabled")).toBool(m_sqlEnabled));
    if (o.contains(QStringLiteral("sqlMaxRows")))
        setSqlMaxRows(o.value(QStringLiteral("sqlMaxRows")).toInt(m_sqlMaxRows));
    return true;
}

bool VaultSettings::save()
{
    if (m_vault.isEmpty())
        return false;
    QDir().mkpath(QDir(m_vault).filePath(QStringLiteral(".flora")));
    QFile f(settingsPath());
    if (!f.open(QIODevice::WriteOnly | QIODevice::Truncate))
        return false;
    QJsonObject o;
    o.insert(QStringLiteral("journalDir"), m_journalDir);
    o.insert(QStringLiteral("sqlEnabled"), m_sqlEnabled);
    o.insert(QStringLiteral("sqlMaxRows"), m_sqlMaxRows);
    f.write(QJsonDocument(o).toJson(QJsonDocument::Indented));
    return true;
}

void VaultSettings::resetDefaults()
{
    bool touched = false;
    if (m_journalDir != QStringLiteral("Журнал")) {
        m_journalDir = QStringLiteral("Журнал");
        touched = true;
    }
    if (!m_sqlEnabled) {
        m_sqlEnabled = true;
        touched = true;
    }
    if (m_sqlMaxRows != 50) {
        m_sqlMaxRows = 50;
        touched = true;
    }
    if (touched)
        emit changed();
}