/*
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2013 CERN
 * Copyright (C) 2019-2021 KiCad Developers, see AUTHORS.txt for contributors.
 * @author Maciej Suminski <maciej.suminski@cern.ch>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, you may find one here:
 * http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
 * or you may search the http://www.gnu.org website for the version 2 license,
 * or you may write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
 */

#include <eda_draw_frame.h>
#include <tool/action_manager.h>
#include <tool/tool_action.h>
#include <tool/tool_manager.h>
#include <trace_helpers.h>
#include <wx/log.h>

#include <hotkeys_basic.h>
#include <cctype>

ACTION_MANAGER::ACTION_MANAGER( TOOL_MANAGER* aToolManager ) :
    m_toolMgr( aToolManager )
{
    // Register known actions
    std::list<TOOL_ACTION*>& actionList = GetActionList();

    for( TOOL_ACTION* action : actionList )
    {
        if( action->m_id == -1 )
            action->m_id = MakeActionId( action->m_name );

        RegisterAction( action );
    }
}


ACTION_MANAGER::~ACTION_MANAGER()
{
}


void ACTION_MANAGER::RegisterAction( TOOL_ACTION* aAction )
{
    // TOOL_ACTIONs are supposed to be named [appName.]toolName.actionName (with dots between)
    // action name without specifying at least toolName is not valid
    wxASSERT( aAction->GetName().find( '.', 0 ) != std::string::npos );

    // TOOL_ACTIONs must have unique names & ids
    wxASSERT( m_actionNameIndex.find( aAction->m_name ) == m_actionNameIndex.end() );

    m_actionNameIndex[aAction->m_name] = aAction;
}


void ACTION_MANAGER::SetConditions( const TOOL_ACTION& aAction,
                                    const ACTION_CONDITIONS& aConditions )
{
    // Remove any existing handlers with the old conditions to ensure the UI layer doesn't have
    // stale data.
    if( m_toolMgr )
        m_toolMgr->GetToolHolder()->UnregisterUIUpdateHandler( aAction );

    m_uiConditions[aAction.GetId()] = aConditions;

    wxLogTrace( kicadTraceToolStack,
                "ACTION_MANAGER::SetConditions: Registering conditions for ID %d - %s",
                aAction.GetId(), aAction.GetName() );

    // Register a new handler with the new conditions
    if( m_toolMgr )
        m_toolMgr->GetToolHolder()->RegisterUIUpdateHandler( aAction, aConditions );
}


const ACTION_CONDITIONS* ACTION_MANAGER::GetCondition( const TOOL_ACTION& aAction ) const
{
    const auto it = m_uiConditions.find( aAction.GetId() );

    // If the action doesn't have something registered, then return null
    if( it == m_uiConditions.end() )
        return nullptr;
    else
        return &it->second;
}


int ACTION_MANAGER::MakeActionId( const std::string& aActionName )
{
    static int currentActionId = 1;

    return currentActionId++;
}


TOOL_ACTION* ACTION_MANAGER::FindAction( const std::string& aActionName ) const
{
    std::map<std::string, TOOL_ACTION*>::const_iterator it = m_actionNameIndex.find( aActionName );

    if( it != m_actionNameIndex.end() )
        return it->second;

    return nullptr;
}


bool ACTION_MANAGER::RunHotKey( int aHotKey ) const
{
    int key = aHotKey & ~MD_MODIFIER_MASK;
    int mod = aHotKey & MD_MODIFIER_MASK;

    if( key >= 'a' && key <= 'z' )
        key = std::toupper( key );

    wxLogTrace( kicadTraceToolStack, "ACTION_MANAGER::RunHotKey Key: %s",
                KeyNameFromKeyCode( aHotKey ) );

    HOTKEY_LIST::const_iterator it = m_actionHotKeys.find( key | mod );

    // If no luck, try without Shift, to handle keys that require it
    // e.g. to get ? you need to press Shift+/ without US keyboard layout
    // Hardcoding ? as Shift+/ is a bad idea, as on another layout you may need to press a
    // different combination
    if( it == m_actionHotKeys.end() )
    {
        wxLogTrace( kicadTraceToolStack,
                    "ACTION_MANAGER::RunHotKey No actions found, searching with key: %s",
                    KeyNameFromKeyCode( key | ( mod & ~MD_SHIFT ) ) );

        it = m_actionHotKeys.find( key | ( mod & ~MD_SHIFT ) );

        if( it == m_actionHotKeys.end() )
            return false; // no appropriate action found for the hotkey
    }

    const std::list<TOOL_ACTION*>& actions = it->second;

    // Choose the action that has the highest priority on the active tools stack
    // If there is none, run the global action associated with the hot key
    int highestPriority = -1, priority = -1;
    const TOOL_ACTION* context = nullptr; // pointer to context action of the highest priority tool
    std::vector<const TOOL_ACTION*> global; // pointers to global actions
                                            // if there is no context action

    for( const TOOL_ACTION* action : actions )
    {
        if( action->GetScope() == AS_GLOBAL )
        {
            // Store the global action in case there are no context actions to run
            global.emplace_back( action );
            continue;
        }

        TOOL_BASE* tool = m_toolMgr->FindTool( action->GetToolName() );

        if( tool )
        {
            // Choose the action that goes to the tool with highest priority
            // (i.e. is on the top of active tools stack)
            priority = m_toolMgr->GetPriority( tool->GetId() );

            if( priority >= 0 && priority > highestPriority )
            {
                highestPriority = priority;
                context = action;
            }
        }
    }

    // Get the selection to use to test if the action is enabled
    SELECTION& sel = m_toolMgr->GetToolHolder()->GetCurrentSelection();

    if( context )
    {
        bool runAction = true;

        if( const ACTION_CONDITIONS* aCond = GetCondition( *context ) )
            runAction = aCond->enableCondition( sel );

        wxLogTrace( kicadTraceToolStack,
                    "ACTION_MANAGER::RunHotKey %s context action: %s for hotkey %s",
                    runAction ? "Running" : "Not running",
                    context->GetName(),
                    KeyNameFromKeyCode( aHotKey ) );

        if( runAction )
            return m_toolMgr->RunAction( *context, true );
    }
    else if( !global.empty() )
    {
        for( auto act : global )
        {
            bool runAction = true;

            if( const ACTION_CONDITIONS* aCond = GetCondition( *act ) )
                runAction = aCond->enableCondition( sel );

            wxLogTrace( kicadTraceToolStack,
                        "ACTION_MANAGER::RunHotKey %s global action: %s for hotkey %s",
                        runAction ? "Running" : "Not running",
                        act->GetName(),
                        KeyNameFromKeyCode( aHotKey ) );

            if( runAction && m_toolMgr->RunAction( *act, true ) )
                return true;
        }
    }

    wxLogTrace( kicadTraceToolStack,
                "ACTION_MANAGER::RunHotKey No action found for key %s",
                KeyNameFromKeyCode( aHotKey ) );

    return false;
}


const std::map<std::string, TOOL_ACTION*>& ACTION_MANAGER::GetActions() const
{
    return m_actionNameIndex;
}


int ACTION_MANAGER::GetHotKey( const TOOL_ACTION& aAction ) const
{
    std::map<int, int>::const_iterator it = m_hotkeys.find( aAction.GetId() );

    if( it == m_hotkeys.end() )
        return 0;

    return it->second;
}


void ACTION_MANAGER::UpdateHotKeys( bool aFullUpdate )
{
    std::map<std::string, int> legacyHotKeyMap;
    std::map<std::string, int> userHotKeyMap;

    m_actionHotKeys.clear();
    m_hotkeys.clear();

    if( aFullUpdate && m_toolMgr->GetToolHolder() )
    {
        ReadLegacyHotkeyConfig( m_toolMgr->GetToolHolder()->ConfigBaseName(), legacyHotKeyMap );
        ReadHotKeyConfig( wxEmptyString, userHotKeyMap );
    }

    for( const auto& ii : m_actionNameIndex )
    {
        TOOL_ACTION* action = ii.second;
        int          hotkey = 0;

        if( aFullUpdate )
            hotkey = processHotKey( action, legacyHotKeyMap, userHotKeyMap );
        else
            hotkey = action->GetHotKey();

        if( hotkey > 0 )
            m_actionHotKeys[hotkey].push_back( action );

        m_hotkeys[action->GetId()] = hotkey;
    }
}


int ACTION_MANAGER::processHotKey( TOOL_ACTION* aAction, std::map<std::string, int> aLegacyMap,
                                   std::map<std::string, int> aHotKeyMap )
{
    aAction->m_hotKey = aAction->m_defaultHotKey;

    if( !aAction->m_legacyName.empty() && aLegacyMap.count( aAction->m_legacyName ) )
        aAction->SetHotKey( aLegacyMap[ aAction->m_legacyName ] );

    if( aHotKeyMap.count( aAction->m_name ) )
        aAction->SetHotKey( aHotKeyMap[ aAction->m_name ] );

    return aAction->m_hotKey;
}
