/**

 * $Id$

 *

 * 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;

}

gboolean input_has_device( const gchar *id )

{

    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 ) {

	    return TRUE;

	}

    }

    return FALSE;

}

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;

}