#include "driver.h"

#include "kernel.h"
#include "string.h"
#include "stdio.h"
#include "stdlib.h"

static driver_vtable_t const driver_vtable = {
	driver_activate,
	driver_deactivate,
	driver_deinit,
	driver_print_info
};

void driver_init( driver_t *driver, driver_type_t type, interrupt_t *interrupt, void *context )
{
	memset( driver, 0, sizeof( driver_t ) );

	driver->type = type;
	driver->interrupt = interrupt;
	driver->context = context;
	
	driver->vtable = &driver_vtable;
}

void driver_activate( void *obj )
{
}

void driver_deactivate( void *obj )
{
}

void driver_deinit( void *obj )
{
}

void driver_print_info( void *obj )
{
	puts( "Unknown driver" );	
}

void driver_manager_init( driver_manager_t *manager )
{
	memset( manager, 0, sizeof( driver_manager_t ) );

	manager->nof_drivers = 0;
}

void driver_manager_add_driver( driver_manager_t *manager, driver_t *driver )
{
	if( manager->nof_drivers >= MAX_NOF_DRIVERS - 1 ) {
		kernel_panic( "Allocating more than %d drivers.. increase kernel constant MAX_NOF_DRIVERS", MAX_NOF_DRIVERS );
	}

	manager->driver[manager->nof_drivers] = driver;
	manager->nof_drivers++;
}

void driver_manager_activate_all( driver_manager_t *manager )
{
	for( int i = 0; i < manager->nof_drivers; i++ ) {
		driver_t *driver = (driver_t *)manager->driver[i];
		driver->vtable->activate( driver );
	}
}

void driver_manager_deactivate_all( driver_manager_t *manager )
{
	if( manager->nof_drivers == 0 ) {
		return;
	}

	for( int i = manager->nof_drivers - 1; i >= 0; i-- ) {
		driver_t *driver = (driver_t *)manager->driver[i];
		driver->vtable->deactivate( driver );
	}
}

void driver_manager_deinit( driver_manager_t *manager )
{
	if( manager->nof_drivers == 0 ) {
		return;
	}

	for( int i = manager->nof_drivers - 1; i >= 0; i-- ) {
		driver_t *driver = (driver_t *)manager->driver[i];
		driver->vtable->deinit( driver );
		free( driver );
	}
}

void driver_manager_print_info_all( driver_manager_t *manager )
{
	for( int i = 0; i < manager->nof_drivers; i++ ) {
		driver_t *driver = (driver_t *)manager->driver[i];
		driver->vtable->print_info( driver );
	}
}

driver_t *driver_manager_find_driver( driver_manager_t *manager, driver_type_t type )
{
	driver_t *driver;

	for( int i = 0; i < manager->nof_drivers; i++ ) {
		driver_t *driver = (driver_t *)manager->driver[i];
		if( driver->type == type ) {
			return driver;
		}
	}

	return NULL;
	
}