#include "HistoryManager.h"
#include "../AppLayers/NotifyLayer.h"

void HistoryManager::Clear() {
    for (int i = 0; i < (int)history.size(); i++) {
        delete history[i].release();
    }
    history.clear();
    cursor = -1;
}

json HistoryManager::GetEvents() {
    json events = json::array();
    for (int i = 0; i <= cursor; i++) {
        json event = history[i]->Serialize();
        events.push_back(event);
    }
    return events;
}

void HistoryManager::Execute(std::unique_ptr<Command> command) {
    if (history.size() && cursor < (int)history.size() - 1) {
        for (int i = cursor + 1; i < (int)history.size(); i++) {
            delete history[i].release();
        }
        history.erase(history.begin() + cursor + 1, history.end());
    }
    command->Execute();
    history.push_back(std::move(command));
    cursor++;
}

void HistoryManager::Undo() {
    if (CanUndo()) {
        NotifyAppLayer::SetMessage("Undo: " + history[cursor]->GetTitle());
        history[cursor]->Undo();
        cursor--;
    }
}

void HistoryManager::Redo() {
    if (CanRedo()) {
        cursor++;
        NotifyAppLayer::SetMessage("Redo: " + history[cursor]->GetTitle());
        history[cursor]->Execute();
    }
}

bool HistoryManager::CanUndo() {
    return cursor >= 0;
}

bool HistoryManager::CanRedo() {
    return cursor < (int)history.size() - 1;
}