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#include "diffeditormanager.h"
#include "diffeditor.h"
#include "diffeditordocument.h"
#include "diffeditorconstants.h"
#include "diffeditordocument.h"
#include <coreplugin/editormanager/editormanager.h>
#include <coreplugin/editormanager/documentmodel.h>
#include <coreplugin/id.h>
#include <utils/qtcassert.h>

namespace DiffEditor {

using namespace Internal;

static DiffEditorManager *m_instance = 0;

DiffEditorManager::DiffEditorManager(QObject *parent)
    : QObject(parent)
{
    QTC_ASSERT(!m_instance, return);
    m_instance = this;

    Core::EditorManager *editorManager = Core::EditorManager::instance();
    connect(editorManager, &Core::EditorManager::editorsClosed,
            this, &DiffEditorManager::slotEditorsClosed);
}

DiffEditorManager::~DiffEditorManager()
{
    m_instance = 0;
}

void DiffEditorManager::slotEditorsClosed(const QList<Core::IEditor *> &editors)
{
    QMap<Core::IDocument *, int> editorsForDocument;
    for (int i = 0; i < editors.count(); i++) {
        DiffEditor *diffEditor = qobject_cast<DiffEditor *>(editors.at(i));
        if (diffEditor) {
            Core::IDocument *document = diffEditor->document();
            editorsForDocument[document]++;
        }
    }
    QMapIterator<Core::IDocument *, int> it(editorsForDocument);
    while (it.hasNext()) {
        it.next();
        if (Core::DocumentModel::editorsForDocument(it.key()).count() == 0) // no other editors use that document
            removeDocument(it.key());
    }
}

Core::IDocument *DiffEditorManager::find(const QString &vcsId)
{
    return m_instance->m_idToDocument.value(vcsId);
}

Core::IDocument *DiffEditorManager::findOrCreate(const QString &vcsId, const QString &displayName)
{
    auto document = static_cast<Internal::DiffEditorDocument *>(find(vcsId));
    if (document)
        return document;

    const QString msgWait = tr("Waiting for data...");
    DiffEditor *diffEditor = qobject_cast<DiffEditor *>(
                Core::EditorManager::openEditorWithContents(Constants::DIFF_EDITOR_ID,
                                                            0, msgWait.toUtf8()));
    QTC_ASSERT(diffEditor, return 0);

    document = qobject_cast<Internal::DiffEditorDocument *>(diffEditor->document());
    QTC_ASSERT(diffEditor, return 0);

    document->setDisplayName(displayName);

    m_instance->m_idToDocument.insert(vcsId, document);

    return document;
}

DiffEditorController *DiffEditorManager::controller(Core::IDocument *document)
{
    auto doc = qobject_cast<DiffEditorDocument *>(document);
    return doc ? doc->controller() : 0;
}

void DiffEditorManager::removeDocument(Core::IDocument *document)
{
    DiffEditorDocument *doc = qobject_cast<DiffEditorDocument *>(document);
    QTC_ASSERT(doc, return);
    for (auto it = m_instance->m_idToDocument.constBegin(); it != m_instance->m_idToDocument.constEnd(); ++it) {
        if (it.value() == doc) {
            m_instance->m_idToDocument.remove(it.key());
            break;
        }
    }
}

} // namespace DiffEditor