/**

 * $Id$

 *

 * 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,

#else

#ifdef HAVE_COCOA

        &display_osx_driver,

#endif

#endif

#ifdef __ANDROID__

        &display_gl_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;

    lxdream_config_group_t group;

    struct keymap_entry *next; // allow chaining

} *keymap_entry_t;

typedef struct mouse_entry {

    gboolean relative;

    input_mouse_callback_t callback;

    void *data;

    const lxdream_config_group_t group;

    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;

#ifndef GL_RGBA8

#define GL_RGBA8 GL_RGBA8_OES

#endif

#ifndef GL_RGB5

#define GL_RGB5 GL_RGB565

#endif

#ifndef GL_BGR

#define GL_BGR GL_BGRA

#endif

/**

 * 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 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;

}

gchar *input_keycode_to_keysym( 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 ) {

            keymap_entry_t newentry = g_malloc0(sizeof(struct keymap_entry));

            newentry->next = *entryp;

            newentry->callback = callback;

            newentry->data = data;

            newentry->value = value;

            *entryp = newentry;

            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 ) {

            while( *entryp != NULL ) {

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

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

                    keymap_entry_t next = (*entryp)->next;

                    g_free( *entryp );

                    *entryp = next;

                    break;

                }

                entryp = &(*entryp)->next; // Yes, really

            }

        }

        s++;

    }

    g_strfreev(strv);

}

int input_register_keygroup( lxdream_config_group_t group)

{

    int i;

    int result = 0;

    for( i=0; group->params[i].key != NULL; i++ ) {

        if( group->params[i].type == CONFIG_TYPE_KEY ) {

            if( input_register_key( group->params[i].value, group->key_binding, group->data, group->params[i].tag ) ) {

                result++;

            }

        }

    }

    return result;

}

void input_unregister_keygroup( lxdream_config_group_t group )

{

    int i;

    for( i=0; group->params[i].key != NULL; i++ ) {

        if( group->params[i].type == CONFIG_TYPE_KEY ) {

            input_unregister_key( group->params[i].value, group->key_binding, group->data, group->params[i].tag );

        }

    }

}

gboolean input_keygroup_changed( void *data, lxdream_config_group_t group, unsigned key,

                                 const gchar *oldval, const gchar *newval )

{

    input_unregister_key( oldval, group->key_binding, group->data, group->params[key].tag );

    input_register_key( newval, group->key_binding, group->data, group->params[key].tag );

    return TRUE;

}

gboolean input_register_keyboard_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_keyboard_hook( input_key_callback_t callback,

                            void *data )

{

    keymap_entry_t key = keyhooks;

    if( key != NULL ) {

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

            keyhooks = keyhooks->next;

            free(key);

            return;

        }

        while( key->next != NULL ) {

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

                keymap_entry_t next = key->next;

                key->next = next->next;

                free(next);

                return;

            }

            key = key->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 ) {

            keymap_entry_t key = *entryp;

            while( key != NULL ) {

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

                key = key->next;

            }

        }

        if( driver == NULL ) {

            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_keycode_to_keysym( 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 )

{

    if( display_focused ) {

        keymap_entry_t *entryp = input_entry_from_keycode(driver,keycode);

        if( entryp != NULL ) {

            keymap_entry_t key = *entryp;

            while( key != NULL ) {

                key->callback( key->data, key->value, 0, FALSE );

                key = key->next;

            }

        }

        if( driver == NULL ) {

            keymap_entry_t key = keyhooks;

            while( key != NULL ) {

                key->callback( key->data, keycode, 0, FALSE );

                key = key->next;

            }

        }

    }

}

uint16_t input_keycode_to_dckeysym( uint16_t keycode )

{

    return display_driver->convert_to_dckeysym(keycode);

}

void input_set_keysym_hook( display_keysym_callback_t hook, void *data )

{

    display_keysym_hook = hook;

    display_keysym_hook_data = data;

}

/***************** System mouse driver ****************/

static struct keymap_entry *mouse_keymap[MAX_MOUSE_BUTTONS];

static struct mouse_entry *mousehooks = NULL;

static uint32_t mouse_x = -1, mouse_y = -1, mouse_buttons = 0;

uint16_t mouse_resolve_keysym( struct input_driver *driver, const gchar *keysym )

{

    if( strncasecmp( keysym, "Button", 6 ) == 0 ){

        unsigned long button = strtoul( keysym+6, NULL, 10 );

        if( button > MAX_MOUSE_BUTTONS ) {

            return 0;

        }

        return (uint16_t)button;

    }

    return 0;

}

gchar *mouse_get_keysym( struct input_driver *driver, uint16_t keycode )

{

    return g_strdup_printf( "Button%d", (keycode) );

}

struct input_driver system_mouse_driver = { "Mouse", mouse_resolve_keysym, NULL, mouse_get_keysym, NULL };

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 ) {

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

            mousehooks = mousehooks->next;

            free(ent);

            return;

        }

        while( ent->next != NULL ) {

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

                mouse_entry_t next = ent->next;

                ent->next = next->next;

                free(next);

                return;

            }

            ent = ent->next;

        }

    }

}

void input_event_run_mouse_hooks( uint32_t buttons, int32_t x, int32_t y, gboolean absolute )

{

    mouse_entry_t ent = mousehooks;

    while( ent != NULL ) {

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

        ent = ent->next;

    }

}

void input_event_mousedown( uint16_t button, int32_t x, int32_t y, gboolean absolute )

{

    if( absolute ) {

        mouse_x = x;

        mouse_y = y;

    }

    mouse_buttons |= (1<<button);

    input_event_keydown( &system_mouse_driver, button+1, MAX_PRESSURE );

    input_event_run_mouse_hooks( mouse_buttons, x, y, absolute );

}    

void input_event_mouseup( uint16_t button, int32_t x, int32_t y, gboolean absolute )

{

    if( absolute ) {

        mouse_x = x;

        mouse_y = y;

    }

    mouse_buttons &= ~(1<<button);

    input_event_keyup( &system_mouse_driver, button+1 );

    input_event_run_mouse_hooks( mouse_buttons, x, y, absolute );

}

void input_event_mousemove( int32_t x, int32_t y, gboolean absolute )

{

    if( absolute ) {

        mouse_x = x;

        mouse_y = y;

    }

    input_event_run_mouse_hooks( mouse_buttons, x, y, absolute );

}

/************************ Main display driver *************************/

void print_display_drivers( FILE *out )

{

    int i;

    fprintf( out, "Available video drivers:\n" );

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

        fprintf( out, "  %-8s %s\n", display_driver_list[i]->name,

                gettext(display_driver_list[i]->description) );

    }

}

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 ) {

        input_register_device(&system_mouse_driver, MAX_MOUSE_BUTTONS);

    } else {

        display_driver = NULL;

    }

    return rv;

}

void display_set_focused( gboolean has_focus )

{

    display_focused = has_focus;

}