/*  Grafx2 - The Ultimate 256-color bitmap paint program

    Copyright 2007 Adrien Destugues
    Copyright 1996-2001 Sunset Design (Guillaume Dorme & Karl Maritaud)

    Grafx2 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; version 2
    of the License.

    Grafx2 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 Grafx2; if not, see <http://www.gnu.org/licenses/> or
    write to the Free Software Foundation, Inc.,
    59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
*/

#include <SDL.h>

#include "global.h"
#include "clavier.h"
#include "graph.h"
#include "sdlscreen.h"
#include "windows.h"
#include "erreurs.h"

void Handle_Window_Resize(SDL_Event* event);
void Handle_Window_Exit(SDL_Event* event);


// Called each time there is a cursor move, either triggered by mouse or keyboard shortcuts
int Move_cursor_with_constraints()
{
  //Gestion "avancée" du curseur: interdire la descente du curseur dans le
  //menu lorsqu'on est en train de travailler dans l'image
  if (Operation_Taille_pile != 0)
  {
        byte bl=0;//BL va indiquer si on doit corriger la position du curseur

        //Si le curseur ne se trouve plus dans l'image
        if(Menu_Ordonnee<=INPUT_Nouveau_Mouse_Y)
        {
            //On bloque le curseur en fin d'image
            bl++;
            INPUT_Nouveau_Mouse_Y=Menu_Ordonnee-1; //La ligne !!au-dessus!! du menu
        }

        if(Loupe_Mode)
        {
            if(Operation_dans_loupe==0)
            {
                if(INPUT_Nouveau_Mouse_X>=Principal_Split)
                {
                    bl++;
                    INPUT_Nouveau_Mouse_X=Principal_Split-1;
                }
            }
            else
            {
                if(INPUT_Nouveau_Mouse_X<Principal_X_Zoom)
                {
                    bl++;
                    INPUT_Nouveau_Mouse_X=Principal_X_Zoom;
                }
            }
        }

        if (bl)
        {
            SDL_WarpMouse(
                    INPUT_Nouveau_Mouse_X*Pixel_width,
                    INPUT_Nouveau_Mouse_Y*Pixel_height
                    );
        }
  }

  if (
          (INPUT_Nouveau_Mouse_X != Mouse_X) ||
          (INPUT_Nouveau_Mouse_Y != Mouse_Y) ||
          (INPUT_Nouveau_Mouse_K != Mouse_K)
     )
  {
      Forcer_affichage_curseur=0;
      Effacer_curseur(); // On efface le curseur AVANT de le déplacer...
      Mouse_X=INPUT_Nouveau_Mouse_X;
      Mouse_Y=INPUT_Nouveau_Mouse_Y;
      Mouse_K=INPUT_Nouveau_Mouse_K;
      Calculer_coordonnees_pinceau();
      Afficher_curseur();
      return 1;
  }
  else
    return 0;
}

// Fonction qui filtre les evenements génériques.
void Gere_Evenement_SDL(SDL_Event * event)
{
    // Redimensionnement fenetre
    if (event->type == SDL_VIDEORESIZE )
    {
        Handle_Window_Resize(event);
    }
    // Fermeture
    if (event->type == SDL_QUIT )
    {
        Handle_Window_Exit(event);
    }
}


// WM events management

void Handle_Window_Resize(SDL_Event* event)
{
    Resize_Largeur = event->resize.w;
    Resize_Hauteur = event->resize.h;
}

void Handle_Window_Exit(SDL_Event* event)
{
    Quit_demande = 1;
}

// Mouse events management

int Handle_Mouse_Move(SDL_Event* event)
{
    INPUT_Nouveau_Mouse_X = event->motion.x/Pixel_width;
    INPUT_Nouveau_Mouse_Y = event->motion.y/Pixel_height;

    return Move_cursor_with_constraints();
}

void Handle_Mouse_Click(SDL_Event* event)
{
    switch(event->button.button)
    {
        case SDL_BUTTON_LEFT:
            INPUT_Nouveau_Mouse_K |= 1;
            break;

        case SDL_BUTTON_MIDDLE:
            INPUT_Nouveau_Mouse_K |= 4;
            break;

        case SDL_BUTTON_RIGHT:
            INPUT_Nouveau_Mouse_K |= 2;
            break;
        default:
            DEBUG("Unknown mouse button!",0);
            return;
    }
    Move_cursor_with_constraints();
}

void Handle_Mouse_Release(SDL_Event* event)
{
    switch(event->button.button)
    {
        case SDL_BUTTON_LEFT:
            INPUT_Nouveau_Mouse_K &= ~1;
            break;

        case SDL_BUTTON_MIDDLE:
            INPUT_Nouveau_Mouse_K &= ~4;
            break;

        case SDL_BUTTON_RIGHT:
            INPUT_Nouveau_Mouse_K &= ~2;
            break;
        default:
            DEBUG("Unknown mouse button!",0);
            return;
    }
    Move_cursor_with_constraints();
}

// Keyboard management

int Handle_Key_Press(SDL_Event* event)
{
    //Appui sur une touche du clavier
    Touche = Conversion_Touche(event->key.keysym);
    Touche_ANSI = Conversion_ANSI(event->key.keysym);

    if(Touche == Config_Touche[SPECIAL_MOUSE_UP])
    {
        //si on est déjà en haut on peut plus bouger
        if(INPUT_Nouveau_Mouse_Y!=0)
        {
            if(Loupe_Mode && INPUT_Nouveau_Mouse_Y < Menu_Ordonnee && INPUT_Nouveau_Mouse_X > Principal_Split)
                INPUT_Nouveau_Mouse_Y=INPUT_Nouveau_Mouse_Y<Loupe_Facteur?0:INPUT_Nouveau_Mouse_Y-Loupe_Facteur;
            else
                INPUT_Nouveau_Mouse_Y--;
            if(Move_cursor_with_constraints()) return 0;
            return 1;
        }
    }
    else if(Touche == Config_Touche[SPECIAL_MOUSE_DOWN])
    {
        if(INPUT_Nouveau_Mouse_Y<Hauteur_ecran-1)
        {
            if(Loupe_Mode && INPUT_Nouveau_Mouse_Y < Menu_Ordonnee && INPUT_Nouveau_Mouse_X > Principal_Split)
            {
                INPUT_Nouveau_Mouse_Y+=Loupe_Facteur;
                if (INPUT_Nouveau_Mouse_Y>=Hauteur_ecran)
                    INPUT_Nouveau_Mouse_Y=Hauteur_ecran-1;
            }
            else
                INPUT_Nouveau_Mouse_Y++;
            if(Move_cursor_with_constraints()) return 0;
            return 1;
        }
    }
    else if(Touche == Config_Touche[SPECIAL_MOUSE_LEFT])
    {
        if(INPUT_Nouveau_Mouse_X!=0)
        {
            if(Loupe_Mode && INPUT_Nouveau_Mouse_Y < Menu_Ordonnee && INPUT_Nouveau_Mouse_X > Principal_Split)
                INPUT_Nouveau_Mouse_X-=Loupe_Facteur;
            else
                INPUT_Nouveau_Mouse_X--;
            if(Move_cursor_with_constraints()) return 0;
            return 1;
        }
    }
    else if(Touche == Config_Touche[SPECIAL_MOUSE_RIGHT])
    {
        if(INPUT_Nouveau_Mouse_X<Largeur_ecran-1)
        {
            if(Loupe_Mode && INPUT_Nouveau_Mouse_Y < Menu_Ordonnee && INPUT_Nouveau_Mouse_X > Principal_Split)
            {
                INPUT_Nouveau_Mouse_X+=Loupe_Facteur;
                if (INPUT_Nouveau_Mouse_X>=Largeur_ecran)
                    INPUT_Nouveau_Mouse_X=Largeur_ecran-1;
            }
            else
                INPUT_Nouveau_Mouse_X++;
            if(Move_cursor_with_constraints()) return 0;
            return 1;
        }
    }
    else if(Touche == Config_Touche[SPECIAL_CLICK_LEFT])
    {
        INPUT_Nouveau_Mouse_K=1;
        Move_cursor_with_constraints();
        return 1;
    }
    else if(Touche == Config_Touche[SPECIAL_CLICK_RIGHT])
    {
        INPUT_Nouveau_Mouse_K=2;
        Move_cursor_with_constraints();
        return 1;
    }

    if (Operation_Taille_pile!=0 && Touche != 0)
    {
        //Enfin, on inhibe les touches (sauf si c'est un changement de couleur
        //ou de taille de pinceau lors d'une des operations suivantes:
        //OPERATION_DESSIN_CONTINU, OPERATION_DESSIN_DISCONTINU, OPERATION_SPRAY)
        if(Autoriser_changement_de_couleur_pendant_operation)
        {
            //A ce stade là, on sait qu'on est dans une des 3 opérations
            //supportant le changement de couleur ou de taille de pinceau.

            if(
                    (Touche != Config_Touche[SPECIAL_NEXT_FORECOLOR]) &&
                    (Touche != Config_Touche[SPECIAL_PREVIOUS_FORECOLOR]) &&
                    (Touche != Config_Touche[SPECIAL_NEXT_BACKCOLOR]) &&
                    (Touche != Config_Touche[SPECIAL_PREVIOUS_BACKCOLOR]) &&
                    (Touche != Config_Touche[SPECIAL_RETRECIR_PINCEAU]) &&
                    (Touche != Config_Touche[SPECIAL_GROSSIR_PINCEAU]) &&
                    (Touche != Config_Touche[SPECIAL_NEXT_USER_FORECOLOR]) &&
                    (Touche != Config_Touche[SPECIAL_PREVIOUS_USER_FORECOLOR]) &&
                    (Touche != Config_Touche[SPECIAL_NEXT_USER_BACKCOLOR]) &&
                    (Touche != Config_Touche[SPECIAL_PREVIOUS_USER_BACKCOLOR])
              )
            {
                Touche=0;
            }
        }
        else Touche = 0;
    }
    return 0;
}

void Handle_Key_Release(SDL_Event* event)
{
    int ToucheR = Conversion_Touche(event->key.keysym);

    if(ToucheR == Config_Touche[SPECIAL_CLICK_LEFT])
    {
        INPUT_Nouveau_Mouse_K &= ~1;
        Move_cursor_with_constraints();
    }
    else if(ToucheR == Config_Touche[SPECIAL_CLICK_RIGHT])
    {
        INPUT_Nouveau_Mouse_K &= ~2;
        Move_cursor_with_constraints();
    }

    // Other keys don't need to be released : they are handled as "events" and procesed only once.
    // These clicks are apart because they need to be continuous (ie move while key pressed)
    // We are relying on "hardware" keyrepeat to achieve that.
}


// Joystick management

void Handle_Joystick_Press(SDL_Event* event)
{

}

void Handle_Joystick_Release(SDL_Event* event)
{

}

// Main input handling function

int Get_input(void)
{
    SDL_Event event;
    int User_Feedback_Required = 0; // Flag qui indique si on doit arrêter de traiter les évènements ou si on peut enchainer

    Touche_ANSI = 0;

    // Process as much events as possible without redrawing the screen.
    // This mostly allows us to merge mouse events for people with an high
    // resolution mouse
    while( (!User_Feedback_Required) && SDL_PollEvent(&event)) // Try to cumulate for a full VBL except if there is a required feedback
    {
        switch(event.type)
        {
            case SDL_VIDEORESIZE:
                Handle_Window_Resize(&event);
                User_Feedback_Required = 1;
                break;

            case SDL_QUIT:
                Handle_Window_Exit(&event);
                User_Feedback_Required = 1;
                break;

            case SDL_MOUSEMOTION:
                User_Feedback_Required = Handle_Mouse_Move(&event);
                break;

            case SDL_MOUSEBUTTONDOWN:
                Handle_Mouse_Click(&event);
                User_Feedback_Required = 1;
                break;

            case SDL_MOUSEBUTTONUP:
                Handle_Mouse_Release(&event);
                User_Feedback_Required = 1;
                break;

            case SDL_KEYDOWN:
                Handle_Key_Press(&event);
                User_Feedback_Required = 1;
                break;

            case SDL_KEYUP:
                Handle_Key_Release(&event);
                break;

            case SDL_JOYBUTTONUP:
                Handle_Joystick_Press(&event);
                break;

            case SDL_JOYBUTTONDOWN:
                Handle_Joystick_Release(&event);
                User_Feedback_Required = 1;
                break;

            default:
                DEBUG("Unhandled SDL event number : ",event.type);
                break;
        }
    }

    // Vidage de toute mise à jour de l'affichage à l'écran qui serait encore en attente.
    // (c'est fait ici car on est sur que cette fonction est apellée partout ou on a besoin d'interragir avec l'utilisateur)
    Flush_update();

    return User_Feedback_Required;
}