/*
    This file is part of the kolab resource - the implementation of the
    Kolab storage format. See www.kolab.org for documentation on this.

    SPDX-FileCopyrightText: 2004 Bo Thorsen <bo@sonofthor.dk>

    SPDX-License-Identifier: LGPL-2.0-or-later
*/

#include "task.h"
#include "pimkolab_debug.h"

using namespace KolabV2;

KCalendarCore::Todo::Ptr Task::fromXml(const QDomDocument &xmlDoc, const QString &tz)
{
    Task task(tz);
    task.loadXML(xmlDoc);
    KCalendarCore::Todo::Ptr todo(new KCalendarCore::Todo());
    task.saveTo(todo);
    return todo;
}

QString Task::taskToXML(const KCalendarCore::Todo::Ptr &todo, const QString &tz)
{
    Task task(tz, todo);
    return task.saveXML();
}

Task::Task(const QString &tz, const KCalendarCore::Todo::Ptr &task)
    : Incidence(tz, task)
    , mPercentCompleted(0)
    , mStatus(KCalendarCore::Incidence::StatusNone)
{
    if (task) {
        setFields(task);
    }
}

Task::~Task() = default;

void Task::setPercentCompleted(int percent)
{
    mPercentCompleted = percent;
}

int Task::percentCompleted() const
{
    return mPercentCompleted;
}

void Task::setStatus(KCalendarCore::Incidence::Status status)
{
    mStatus = status;
}

KCalendarCore::Incidence::Status Task::status() const
{
    return mStatus;
}

void Task::setParent(const QString &parentUid)
{
    mParent = parentUid;
}

QString Task::parent() const
{
    return mParent;
}

void Task::setDueDate(const QDateTime &date)
{
    mDueDate = date;
    mHasDueDate = true;
}

void Task::setDueDate(const QDate &date)
{
    mDueDate = QDateTime(date, QTime());
    mHasDueDate = true;
    mFloatingStatus = AllDay;
}

void Task::setDueDate(const QString &date)
{
    if (date.length() > 10) {
        // This is a date + time
        setDueDate(stringToDateTime(date));
    } else {
        // This is only a date
        setDueDate(stringToDate(date));
    }
}

QDateTime Task::dueDate() const
{
    return mDueDate;
}

void Task::setHasStartDate(bool v)
{
    mHasStartDate = v;
}

bool Task::hasStartDate() const
{
    return mHasStartDate;
}

bool Task::hasDueDate() const
{
    return mHasDueDate;
}

void Task::setCompletedDate(const QDateTime &date)
{
    mCompletedDate = date;
    mHasCompletedDate = true;
}

QDateTime Task::completedDate() const
{
    return mCompletedDate;
}

bool Task::hasCompletedDate() const
{
    return mHasCompletedDate;
}

bool Task::loadAttribute(QDomElement &element)
{
    QString tagName = element.tagName();

    if (tagName == QLatin1StringView("completed")) {
        bool ok;
        int percent = element.text().toInt(&ok);
        if (!ok || percent < 0 || percent > 100) {
            percent = 0;
        }
        setPercentCompleted(percent);
    } else if (tagName == QLatin1StringView("status")) {
        if (element.text() == QLatin1StringView("in-progress")) {
            setStatus(KCalendarCore::Incidence::StatusInProcess);
        } else if (element.text() == QLatin1StringView("completed")) {
            setStatus(KCalendarCore::Incidence::StatusCompleted);
        } else if (element.text() == QLatin1StringView("waiting-on-someone-else")) {
            setStatus(KCalendarCore::Incidence::StatusNeedsAction);
        } else if (element.text() == QLatin1StringView("deferred")) {
            // Guessing a status here
            setStatus(KCalendarCore::Incidence::StatusCanceled);
        } else {
            // Default
            setStatus(KCalendarCore::Incidence::StatusNone);
        }
    } else if (tagName == QLatin1StringView("due-date")) {
        setDueDate(element.text());
    } else if (tagName == QLatin1StringView("parent")) {
        setParent(element.text());
    } else if (tagName == QLatin1StringView("x-completed-date")) {
        setCompletedDate(stringToDateTime(element.text()));
    } else if (tagName == QLatin1StringView("start-date")) {
        setHasStartDate(true);
        setStartDate(element.text());
    } else {
        return Incidence::loadAttribute(element);
    }

    // We handled this
    return true;
}

bool Task::saveAttributes(QDomElement &element) const
{
    // Save the base class elements
    Incidence::saveAttributes(element);

    writeString(element, QStringLiteral("completed"), QString::number(percentCompleted()));

    switch (status()) {
    case KCalendarCore::Incidence::StatusInProcess:
        writeString(element, QStringLiteral("status"), QStringLiteral("in-progress"));
        break;
    case KCalendarCore::Incidence::StatusCompleted:
        writeString(element, QStringLiteral("status"), QStringLiteral("completed"));
        break;
    case KCalendarCore::Incidence::StatusNeedsAction:
        writeString(element, QStringLiteral("status"), QStringLiteral("waiting-on-someone-else"));
        break;
    case KCalendarCore::Incidence::StatusCanceled:
        writeString(element, QStringLiteral("status"), QStringLiteral("deferred"));
        break;
    case KCalendarCore::Incidence::StatusNone:
        writeString(element, QStringLiteral("status"), QStringLiteral("not-started"));
        break;
    case KCalendarCore::Incidence::StatusTentative:
    case KCalendarCore::Incidence::StatusConfirmed:
    case KCalendarCore::Incidence::StatusDraft:
    case KCalendarCore::Incidence::StatusFinal:
    case KCalendarCore::Incidence::StatusX:
        // All of these are saved as StatusNone.
        writeString(element, QStringLiteral("status"), QStringLiteral("not-started"));
        break;
    }

    if (hasDueDate()) {
        if (mFloatingStatus == HasTime) {
            writeString(element, QStringLiteral("due-date"), dateTimeToString(dueDate()));
        } else {
            writeString(element, QStringLiteral("due-date"), dateToString(dueDate().date()));
        }
    }

    if (!parent().isNull()) {
        writeString(element, QStringLiteral("parent"), parent());
    }

    if (hasCompletedDate() && percentCompleted() == 100) {
        writeString(element, QStringLiteral("x-completed-date"), dateTimeToString(completedDate()));
    }

    return true;
}

bool Task::loadXML(const QDomDocument &document)
{
    QDomElement top = document.documentElement();

    if (top.tagName() != QLatin1StringView("task")) {
        qCWarning(PIMKOLAB_LOG) << QStringLiteral("XML error: Top tag was %1 instead of the expected task").arg(top.tagName());
        return false;
    }
    setHasStartDate(false); // todo's don't necessarily have one

    for (QDomNode n = top.firstChild(); !n.isNull(); n = n.nextSibling()) {
        if (n.isComment()) {
            continue;
        }
        if (n.isElement()) {
            QDomElement e = n.toElement();
            if (!loadAttribute(e)) {
                // TODO: Unhandled tag - save for later storage
                qCDebug(PIMKOLAB_LOG) << "Warning: Unhandled tag" << e.tagName();
            }
        } else {
            qCDebug(PIMKOLAB_LOG) << "Node is not a comment or an element???";
        }
    }

    return true;
}

QString Task::saveXML() const
{
    QDomDocument document = domTree();
    QDomElement element = document.createElement(QStringLiteral("task"));
    element.setAttribute(QStringLiteral("version"), QStringLiteral("1.0"));
    saveAttributes(element);
    if (!hasStartDate() && startDate().isValid()) {
        // events and journals always have a start date, but tasks don't.
        // Remove the entry done by the inherited save above, because we
        // don't have one.
        QDomNodeList l = element.elementsByTagName(QStringLiteral("start-date"));
        Q_ASSERT(l.count() == 1);
        element.removeChild(l.item(0));
    }
    document.appendChild(element);
    return document.toString();
}

void Task::setFields(const KCalendarCore::Todo::Ptr &task)
{
    Incidence::setFields(task);

    setPercentCompleted(task->percentComplete());
    setStatus(task->status());
    setHasStartDate(task->hasStartDate());

    if (task->hasDueDate()) {
        if (task->allDay()) {
            // This is a floating task. Don't timezone move this one
            mFloatingStatus = AllDay;
            setDueDate(task->dtDue().date());
        } else {
            mFloatingStatus = HasTime;
            setDueDate(localToUTC(task->dtDue()));
        }
    } else {
        mHasDueDate = false;
    }

    if (!task->relatedTo().isEmpty()) {
        setParent(task->relatedTo());
    } else {
        setParent(QString());
    }

    if (task->hasCompletedDate() && task->percentComplete() == 100) {
        setCompletedDate(localToUTC(task->completed()));
    } else {
        mHasCompletedDate = false;
    }
}

void Task::saveTo(const KCalendarCore::Todo::Ptr &task)
{
    Incidence::saveTo(task);

    task->setPercentComplete(percentCompleted());
    task->setStatus(status());
    // PORT KF6 task->setHasStartDate( hasStartDate() );
    // PORT KF6 task->setHasDueDate( hasDueDate() );
    if (hasDueDate()) {
        task->setDtDue(utcToLocal(dueDate()));
    }

    if (!parent().isEmpty()) {
        task->setRelatedTo(parent());
    }

    if (hasCompletedDate() && task->percentComplete() == 100) {
        task->setCompleted(utcToLocal(mCompletedDate));
    }
}