//C
#include <stdbool.h>

//POSIX
#include <unistd.h>

//SDL
#include <SDL.h>
#include <SDL_image.h>
#include <SDL_gfxPrimitives.h>

//mine
#include "SFont.h"

/*** Constants ***/
#define NB_MAX_OPTIONS 134

/*** Types definitions and structs ***/

typedef struct{
	uint16_t Numero;
	uint16_t Touche;
	uint16_t Touche2;
	char Libelle[36];
	char Explic1[77];
	char Explic2[77];
	bool Erreur;
	bool Suppr;
} Options;

typedef struct{
	char Signature[3];
	uint8_t Version1;
	uint8_t Version2;
	uint8_t Beta1;
	uint8_t Beta2;
} Type_header;

#define Header_size 7

typedef struct{
	uint8_t Numero;
	uint16_t Taille;
} Type_chunk;

#define Chunk_size 3

/*** Global variables ***/
SFont_Font* MyFont;
SDL_Surface* Ecran;
int Numero_definition_option;
Options Config[NB_MAX_OPTIONS];
bool Choix_enreg;
uint16_t NB_OPTIONS;

/*** Fonctions de gestion des évènements SDL ***/

/* Attend qu'une touche soit pressée. Retourne le keysym. */
SDL_keysym Lire_Touche(void)
{
	SDL_Event Event;

	do{
		SDL_WaitEvent(&Event);
		if(Event.type==SDL_KEYDOWN) break;
	}while(1);

	return Event.key.keysym;
}

/*** Drawing functions ***/

/* Draws a filled rectanble */
void Cadre(int x,int y,int w,int h,uint8_t color)
{
	SDL_Rect rct;
	rct.x=x;
	rct.y=y;
	rct.w=w;
	rct.h=h;
	
	SDL_FillRect(Ecran, &rct, color);
}

/* Draws the main screen and welcome message */
void Dessiner_ecran_principal()
{
	Cadre(3,3,630,40,2);
	SFont_Write(Ecran, MyFont, 8,6,"Setup program for Grafx2 (c) 1996-98 Sunset Design and 2008 PulkoMandy");
	SFont_Write(Ecran, MyFont, 8,18,"Use Up/Down arrows & Page-Up/Page-Down to scroll, Enter to modify, Delete to remove a hot-key, and Escape to validate or cancel.");
	SFont_Write(Ecran, MyFont, 8,30,"DO NOT USE Print-screen, Pause, and other special keys!");

	Cadre(3,46,630,400,1);

	SDL_UpdateRect(Ecran,0,0,640,480);

}

void Tout_ecrire(uint16_t Decalage_curseur,uint16_t Position_curseur)
{
	puts("TOUT ECRIRE UNIMPLEMENTED");
}

/*** Configuration handling functions ***/

/* Defines an option */
void Definir_option(uint16_t Numero, char* Libelle, char* Explic1, char* Explic2, bool Deletable, 
	uint16_t Default_key)
{
	Config[Numero_definition_option].Numero = Numero;
	Config[Numero_definition_option].Touche = Default_key;
	Config[Numero_definition_option].Touche2 = 0xFF;
	strncpy(Config[Numero_definition_option].Libelle,Libelle,36);
	strncpy(Config[Numero_definition_option].Explic1,Explic1,77);
	strncpy(Config[Numero_definition_option].Explic2,Explic2,77);
	Config[Numero_definition_option].Erreur = false;
	Config[Numero_definition_option].Suppr = Deletable;
	Numero_definition_option ++ ;	
}

/* Initialize configuration */
bool Initialiser_config()
{
	bool Erreur = false;
	FILE* Fichier_INI;

	Numero_definition_option = 0;

	Definir_option(0,"Scroll up",
		"Scrolls the picture upwards, both in magnify and normal mode.",
		"This hotkey cannot be removed.",
		false, 0x48); // HAUT
	Definir_option(1,"Scroll down",
		"Scrolls the picture upwards, both in magnify and normal mode.",
		"This hotkey cannot be removed.",
		false, 0x48); // HAUT
	Definir_option(2,"Scroll left",
		"Scrolls the picture upwards, both in magnify and normal mode.",
		"This hotkey cannot be removed.",
		false, 0x48); // HAUT
	Definir_option(3,"Scroll right",
		"Scrolls the picture upwards, both in magnify and normal mode.",
		"This hotkey cannot be removed.",
		false, 0x48); // HAUT
}

uint8_t Fenetre_choix(uint8_t Largeur, uint8_t Hauteur, char* Titre, char* Choix, uint8_t Choix_debut,
	uint8_t Couleur,uint8_t Couleur_choix)
{
	puts("FENETRE CHOIX UNIMPLEMENTED !!!");
	return 0;
}

void Test_duplic()
{
	puts("TEST DUPLIC UNIMPLEMENTED");
}

/* Checks if everything is OK */
bool Validation()
{
	bool Y_a_des_erreurs = false;
	uint16_t i = 0;

	while(i<NB_OPTIONS && !Y_a_des_erreurs)
	{
		Y_a_des_erreurs = Config[i].Erreur;
		i++;
	}
	
	if (Y_a_des_erreurs)
		Choix_enreg = 4 - Fenetre_choix(30,12,
			"There are errors in the\nhot-keys configuration.\nCheck out the \"Err\" column\nin order to correct them.","OK\nQuit anyway",1,0x4C,0x3F);
	else
		Choix_enreg = Fenetre_choix(30,10,"Save configuration?","Yes\nNo\nCancel",1,0x2A,0x6F);
	if (Choix_enreg!=3) return true; else return false;
}

/* Let the user do things */
void Setup()
{
	bool Sortie_OK = false;
	SDL_keysym Touche;
	uint16_t Decalage_curseur=0;
	uint16_t Position_curseur=1;
	Test_duplic();
	Tout_ecrire(0,1);
	do{
		Touche = Lire_Touche();
		switch(Touche.sym)
		{
			case SDLK_UP:
			case SDLK_DOWN:
			case SDLK_PAGEUP:
			case SDLK_PAGEDOWN:
			case SDLK_RETURN:
			case SDLK_DELETE:
				break;
			case SDLK_ESCAPE:
				Sortie_OK=Validation();
				break; 
			default:
				break; // On ne fait rien pour les autres touches
		}
	} while(!Sortie_OK);
}

/*** File management functions ***/

/* Checks if we can write the config file */
bool Verifier_ecriture_possible()
{
	return access("./",W_OK) == 0;
}

/* Save the config file */
void Enregistrer_config()
{
	FILE* Fichier;
	uint16_t Indice;
	uint8_t Octet;

	if(Choix_enreg==true) // Save keys if wanted
	{
		Fichier = fopen("gfx2.cfg","wb");
		fseek(Fichier,Header_size+Chunk_size,SEEK_SET); // Positionnement sur la première touche

		for(Indice = 0;Indice < NB_OPTIONS;Indice++)
		{
			fwrite(&Config[Indice].Numero,sizeof(uint16_t),1,Fichier);
			fwrite(&Config[Indice].Touche,sizeof(uint16_t),1,Fichier);
			fwrite(&Config[Indice].Touche2,sizeof(uint16_t),1,Fichier);
		}

		fclose(Fichier);
	}
}

/*** Main program ***/

int main(void)
{	

	if (Verifier_ecriture_possible())
	{
		/* On initialise SDL */
		SDL_Init(SDL_INIT_VIDEO);
		Ecran = SDL_SetVideoMode(640,480,8,0);
		SDL_WM_SetCaption ("Grafx2 configuration tool","../gfx2.gif");

		/* On initialise SFont */
		MyFont = SFont_InitFont(IMG_Load("5pxtinyfont.png"));

		Dessiner_ecran_principal();
		
		if(!Initialiser_config())
		{
			Setup();
			Enregistrer_config();

			/* On fait un peu de nettoyage avant de s'en aller */
			SFont_FreeFont(MyFont);
			SDL_Quit();
			exit(0);
		}
		else
		{
			puts("Error reading GFX2.DAT! File is absent or corrupt.");
			SFont_FreeFont(MyFont);
			SDL_Quit();
			exit(1);
		}
	}
	else
	{
		puts("Error: you mustn't run this setup program from a read-only drive!\n");
		puts("The most probable cause of this error is that you are running this program");
		puts("from a CD-Rom or a protected floppy disk.");
		puts("You should try to copy all the files of Grafx2 on a hard drive or to");
		puts("unprotect your floppy disk if you really want to run it from this outdated medium.");
		exit(1);
	}

	return 0;
}