/**

  * $Id$

  *

  * Generic support for keyboard and other input sources. The active display

  * driver is expected to deliver events here, where they're translated and

  * passed to the appropriate dreamcast controllers (if any).

  *

  * Copyright (c) 2005 Nathan Keynes.

  *

  * 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.

  */

 #include <stdint.h>

 #include <assert.h>

 #include "dream.h"

 #include "display.h"

 #include "pvr2/pvr2.h"

 display_driver_t display_driver_list[] = { 

 #ifdef HAVE_GTK

 					   &display_gtk_driver,

 #endif

 					   &display_null_driver,

 					   NULL };

 /* Some explanation:

  *   The system has at least one "root" device representing the main display 

  * (which may be the null display). This device is part of the display_driver

  * and generates events with no input_driver. The root device has no id

  * as such (for the purposes of event names)

  *

  *   The system may also have one or more auxilliary devices which each have

  * an input_driver and an id (eg "JS0"). So the keysym "Return" is (de)coded by

  * the root device, and the keysym "JS0: Button0" is (de)coded by the JS0 input

  * device as "Button0".

  *

  *   For the moment, mice are handled specially, as they behave a little

  * differently from other devices (although this will probably change in the 

  * future.

  */

 typedef struct keymap_entry {

     input_key_callback_t callback;

     void *data;

     uint32_t value;

     struct keymap_entry *next; // allow chaining

 } *keymap_entry_t;

 typedef struct mouse_entry {

     gboolean relative;

     input_mouse_callback_t callback;

     void *data;

     struct mouse_entry *next;

 } *mouse_entry_t;

 typedef struct input_driver_entry {

     input_driver_t driver;

     uint16_t entry_count;

     struct keymap_entry *keymap[0];

 } *input_driver_entry_t;

 /**

  * Colour format information

  */

 struct colour_format colour_formats[] = {

     { GL_UNSIGNED_SHORT_1_5_5_5_REV, GL_BGRA, GL_RGB5_A1, 2 },

     { GL_UNSIGNED_SHORT_5_6_5, GL_RGB, GL_RGB5, 2 },

     { GL_UNSIGNED_SHORT_4_4_4_4_REV, GL_BGRA, GL_RGBA4, 2 },

     { GL_UNSIGNED_BYTE, GL_BGRA, GL_RGBA8, 4 }, /* YUV decoded to ARGB8888 */

     { GL_UNSIGNED_BYTE, GL_BGR, GL_RGB, 3 },

     { GL_UNSIGNED_BYTE, GL_BGRA, GL_RGBA8, 4 },

     { GL_UNSIGNED_BYTE, GL_BGRA, GL_RGBA8, 4 }, /* Index4 decoded */

     { GL_UNSIGNED_BYTE, GL_BGRA, GL_RGBA8, 4 }, /* Index8 decoded */

     { GL_UNSIGNED_BYTE, GL_BGRA, GL_RGBA8, 4 },

     { GL_UNSIGNED_BYTE, GL_RGB, GL_RGB, 3 },

 };

 /**

  * FIXME: make this more memory efficient

  */

 static struct keymap_entry *root_keymap[65535];

 static struct keymap_entry *keyhooks = NULL;

 static struct mouse_entry *mousehooks = NULL;

 static gboolean display_focused = TRUE;

 static GList *input_drivers= NULL;

 static display_keysym_callback_t display_keysym_hook = NULL;

 void *display_keysym_hook_data;

 gboolean input_register_device( input_driver_t driver, uint16_t max_keycode )

 {

     GList *ptr;

     for( ptr = input_drivers; ptr != NULL; ptr = g_list_next(ptr) ) {

 	input_driver_entry_t entry = (input_driver_entry_t)ptr->data;

 	if( strcasecmp( entry->driver->id, driver->id ) == 0 ) {

 	    return FALSE;

 	}

     }

     input_driver_entry_t entry = g_malloc0( sizeof(struct input_driver_entry) + (sizeof(keymap_entry_t) * max_keycode) );

     entry->driver = driver;

     entry->entry_count = max_keycode;

     input_drivers = g_list_append( input_drivers, entry );

     return TRUE;

 }

 void input_unregister_device( input_driver_t driver )

 {

     GList *ptr;

     for( ptr = input_drivers; ptr != NULL; ptr = g_list_next(ptr) ) {

 	input_driver_entry_t entry = (input_driver_entry_t)ptr->data;

 	if( entry->driver == driver ) {

 	    if( driver->destroy != NULL ) {

 		driver->destroy(driver);

 	    }

 	    input_drivers = g_list_remove(input_drivers, (gpointer)entry);

 	    g_free( entry );

 	    return;

 	}

     }

 }

 /**

  * Resolve the keysym and return a pointer to the keymap entry pointer

  * @return keymap pointer or NULL if the key was unresolved

  */

 static struct keymap_entry **input_entry_from_keysym( const gchar *keysym )

 {

     if( keysym == NULL || keysym[0] == 0 ) {

 	return NULL;

     }

     char **strv = g_strsplit(keysym,":",2);

     if( strv[1] == NULL ) {

 	/* root device */

 	if( display_driver == NULL || display_driver->resolve_keysym == NULL) {

 	    // Root device has no input handling

 	    g_strfreev(strv);

 	    return NULL;

 	}

 	uint16_t keycode = display_driver->resolve_keysym(g_strstrip(strv[0]));

 	g_strfreev(strv);

 	if( keycode == 0 ) {

 	    return NULL;

 	}

 	return &root_keymap[keycode-1];

     } else {

 	char *id = g_strstrip(strv[0]);

 	GList *ptr;

 	for( ptr = input_drivers; ptr != NULL; ptr = g_list_next(ptr) ) {

 	    input_driver_entry_t entry = (input_driver_entry_t)ptr->data;

 	    if( strcasecmp( entry->driver->id, id ) == 0 ) {

 		/* we have ze device */

 		if( entry->driver->resolve_keysym == NULL ) {

 		    g_strfreev(strv);

 		    return NULL;

 		} 

 		uint16_t keycode = entry->driver->resolve_keysym(entry->driver, g_strstrip(strv[1]));

 		g_strfreev(strv);

 		if( keycode == 0 || keycode > entry->entry_count ) {

 		    return NULL;

 		}

 		return &entry->keymap[keycode-1];

 	    }

 	}

 	g_strfreev(strv);

 	return NULL; // device not found

     }

 }

 static struct keymap_entry **input_entry_from_keycode( input_driver_t driver, uint16_t keycode )

 {

     GList *ptr;

     if( keycode == 0 ) {

 	return NULL;

     }

     if( driver == NULL ) {

 	return &root_keymap[keycode-1];

     }

     for( ptr = input_drivers; ptr != NULL; ptr = g_list_next(ptr) ) {

 	input_driver_entry_t entry = (input_driver_entry_t)ptr->data;

 	if( entry->driver == driver ) {

 	    if( keycode > entry->entry_count ) {

 		return NULL;

 	    } else {

 		return &entry->keymap[keycode-1];

 	    }

 	}

     }

     return NULL;

 }

 static gchar *input_keysym_for_keycode( input_driver_t driver, uint16_t keycode )

 {

     if( keycode == 0 ) {

 	return NULL;

     }

     if( driver == NULL ) {

 	if( display_driver != NULL && display_driver->get_keysym_for_keycode != NULL ) {

 	    return display_driver->get_keysym_for_keycode(keycode);

 	}

     } else if( driver->get_keysym_for_keycode ) {

 	gchar *sym = driver->get_keysym_for_keycode(driver,keycode);

 	if( sym != NULL ) {

 	    gchar *result = g_strdup_printf( "%s: %s", driver->id, sym );

 	    g_free(sym);

 	    return result;

 	}

     }

     return NULL;

 }

 gboolean input_register_key( const gchar *keysym, input_key_callback_t callback,

 			     void *data, uint32_t value )

 {

     if( keysym == NULL ) {

 	return FALSE;

     }

     int keys = 0;

     gchar **strv = g_strsplit(keysym, ",", 16);

     gchar **s = strv;

     while( *s != NULL ) {

 	keymap_entry_t *entryp = input_entry_from_keysym(*s);

 	if( entryp != NULL ) {

 	    *entryp = g_malloc0(sizeof(struct keymap_entry));

 	    (*entryp)->callback = callback;

 	    (*entryp)->data = data;

 	    (*entryp)->value = value;

 	    keys++;

 	}

 	s++;

     }

     g_strfreev(strv);

     return keys != 0;

 }

 void input_unregister_key( const gchar *keysym, input_key_callback_t callback,

 			   void *data, uint32_t value )

 {

     if( keysym == NULL ) {

 	return;

     }

     gchar **strv = g_strsplit(keysym, ",", 16);

     gchar **s = strv;

     while( *s != NULL ) {

 	keymap_entry_t *entryp = input_entry_from_keysym(*s);

 	if( entryp != NULL && *entryp != NULL && (*entryp)->callback == callback &&

 	    (*entryp)->data == data && (*entryp)->value == value ) {

 	    g_free( *entryp );

 	    *entryp = NULL;

 	}

 	s++;

     }

     g_strfreev(strv);

 }

 gboolean input_register_hook( input_key_callback_t callback,

 			      void *data )

 {

     keymap_entry_t key = malloc( sizeof( struct keymap_entry ) );

     assert( key != NULL );

     key->callback = callback;

     key->data = data;

     key->next = keyhooks;

     keyhooks = key;

     return TRUE;

 }

 void input_unregister_hook( input_key_callback_t callback,

 			    void *data )

 {

     keymap_entry_t key = keyhooks;

     if( key != NULL ) {

 	keymap_entry_t next = key->next;

 	if( key->callback == callback && key->data == data ) {

 	    free(key);

 	    keyhooks = next;

 	    return;

 	}

 	while( next != NULL ) {

 	    if( next->callback == callback && next->data == data ) {

 		key->next = next->next;

 		free(next);

 	    }

 	}

     }

 }

 gboolean input_register_mouse_hook( gboolean relative, input_mouse_callback_t callback,

 				void *data )

 {

     mouse_entry_t ent = malloc( sizeof( struct mouse_entry ) );

     assert( ent != NULL );

     ent->callback = callback;

     ent->data = data;

     ent->next = mousehooks;

     mousehooks = ent;

     return TRUE;

 }    

 void input_unregister_mouse_hook( input_mouse_callback_t callback, void *data )

 {

     mouse_entry_t ent = mousehooks;

     if( ent != NULL ) {

 	mouse_entry_t next = ent->next;

 	if( ent->callback == callback && ent->data == data ) {

 	    free(ent);

 	    mousehooks = next;

 	    return;

 	}

 	while( next != NULL ) {

 	    if( next->callback == callback && next->data == data ) {

 		ent->next = next->next;

 		free(next);

 	    }

 	}

     }

 }

 void input_event_mouse( uint32_t buttons, int32_t x, int32_t y )

 {

     mouse_entry_t ent = mousehooks;

     while( ent != NULL ) {

 	ent->callback(ent->data, buttons, x, y);

 	ent = ent->next;

     }

 }

 gboolean input_is_key_valid( const gchar *keysym )

 {

     keymap_entry_t *ptr = input_entry_from_keysym(keysym);

     return ptr != NULL;

 }

 gboolean input_is_key_registered( const gchar *keysym )

 {

     keymap_entry_t *ptr = input_entry_from_keysym(keysym);

     return ptr != NULL && *ptr != NULL;

 }

 void input_event_keydown( input_driver_t driver, uint16_t keycode, uint32_t pressure )

 {

     if( display_focused ) {

 	keymap_entry_t *entryp = input_entry_from_keycode(driver,keycode);

 	if( entryp != NULL && *entryp != NULL ) {

 	    (*entryp)->callback( (*entryp)->data, (*entryp)->value, pressure, TRUE );

 	}

 	keymap_entry_t key = keyhooks;

 	while( key != NULL ) {

 	    key->callback( key->data, keycode, pressure, TRUE );

 	    key = key->next;

 	}

     }

     if( display_keysym_hook != NULL ) {

 	gchar *sym = input_keysym_for_keycode( driver, keycode );

 	if( sym != NULL ) {

 	    display_keysym_hook(display_keysym_hook_data, sym);

 	    g_free(sym);

 	}

     }

 }

 void input_event_keyup( input_driver_t driver, uint16_t keycode, uint32_t pressure )

 {

     if( display_focused ) {

 	keymap_entry_t *entryp = input_entry_from_keycode(driver,keycode);

 	if( entryp != NULL && *entryp != NULL ) {

 	    (*entryp)->callback( (*entryp)->data, (*entryp)->value, pressure, FALSE );

 	}

 	keymap_entry_t key = keyhooks;

 	while( key != NULL ) {

 	    key->callback( key->data, keycode, pressure, FALSE );

 	    key = key->next;

 	}

     }

 }

 uint16_t input_keycode_to_dckeysym( uint16_t keycode )

 {

     return display_driver->convert_to_dckeysym(keycode);

 }

 display_driver_t get_display_driver_by_name( const char *name )

 {

     int i;

     if( name == NULL ) {

 	return display_driver_list[0];

     }

     for( i=0; display_driver_list[i] != NULL; i++ ) {

 	if( strcasecmp( display_driver_list[i]->name, name ) == 0 ) {

 	    return display_driver_list[i];

 	}

     }

     return NULL;

 }

 gboolean display_set_driver( display_driver_t driver )

 {

     gboolean rv = TRUE;

     if( display_driver != NULL && display_driver->shutdown_driver != NULL ) 

 	display_driver->shutdown_driver();

     display_driver = driver;

     if( driver->init_driver != NULL )

 	rv = driver->init_driver();

     if( !rv ) {

 	display_driver = NULL;

     }

     return rv;

 }

 void display_set_focused( gboolean has_focus )

 {

     display_focused = has_focus;

 }

 void input_set_keysym_hook( display_keysym_callback_t hook, void *data )

 {

     display_keysym_hook = hook;

     display_keysym_hook_data = data;

 }