/***************************************************************************
 * Copyright (c) 2024 Microsoft Corporation
 * Copyright (c) 2026-present Eclipse ThreadX contributors
 *
 * This program and the accompanying materials are made available under the
 * terms of the MIT License which is available at
 * https://opensource.org/licenses/MIT.
 *
 * SPDX-License-Identifier: MIT
 **************************************************************************/


/**************************************************************************/
/**************************************************************************/
/**                                                                       */
/** USBX Component                                                        */
/**                                                                       */
/**   Host Stack                                                          */
/**                                                                       */
/**************************************************************************/
/**************************************************************************/


/* Include necessary system files.  */

#define UX_SOURCE_CODE

#include "ux_api.h"
#include "ux_host_stack.h"


/**************************************************************************/
/*                                                                        */
/*  FUNCTION                                               RELEASE        */
/*                                                                        */
/*    _ux_host_stack_class_instance_destroy               PORTABLE C      */
/*                                                           6.1          */
/*  AUTHOR                                                                */
/*                                                                        */
/*    Chaoqiong Xiao, Microsoft Corporation                               */
/*                                                                        */
/*  DESCRIPTION                                                           */
/*                                                                        */
/*    This function destroys a class instance for a class container.      */
/*                                                                        */
/*  INPUT                                                                 */
/*                                                                        */
/*    class                                 Pointer to class              */
/*    class_instance                        Pointer to class instance     */
/*                                                                        */
/*  OUTPUT                                                                */
/*                                                                        */
/*    Completion Status                                                   */
/*                                                                        */
/*  CALLS                                                                 */
/*                                                                        */
/*    None                                                                */
/*                                                                        */
/*  CALLED BY                                                             */
/*                                                                        */
/*    Application                                                         */
/*    USBX Components                                                     */
/*                                                                        */
/**************************************************************************/
UINT  _ux_host_stack_class_instance_destroy(UX_HOST_CLASS *host_class, VOID *class_instance)
{

VOID    **current_class_instance;
VOID    **next_class_instance;

    /* If trace is enabled, insert this event into the trace buffer.  */
    UX_TRACE_IN_LINE_INSERT(UX_TRACE_HOST_STACK_CLASS_INSTANCE_DESTROY, host_class, class_instance, 0, 0, UX_TRACE_HOST_STACK_EVENTS, 0, 0)

    /* If trace is enabled, register this object.  */
    UX_TRACE_OBJECT_UNREGISTER(class_instance);

    /* Get the pointer to the instance pointed by the instance to destroy.  */
    next_class_instance =  class_instance;
    next_class_instance =  *next_class_instance;

    /* Start with the first class instance attached to the class container.  */
    current_class_instance =  host_class -> ux_host_class_first_instance;

    /* Check if there are any instances attached.  */
    if (current_class_instance == UX_NULL)
    {

        /* Error trap. */
        _ux_system_error_handler(UX_SYSTEM_LEVEL_THREAD, UX_SYSTEM_CONTEXT_ENUMERATOR, UX_HOST_CLASS_INSTANCE_UNKNOWN);

        /* If trace is enabled, insert this event into the trace buffer.  */
        UX_TRACE_IN_LINE_INSERT(UX_TRACE_ERROR, UX_HOST_CLASS_INSTANCE_UNKNOWN, class_instance, 0, 0, UX_TRACE_ERRORS, 0, 0)

        return(UX_HOST_CLASS_INSTANCE_UNKNOWN);
    }

    /* The first instance is a special case because it is attached to the class
       container.  */
    if (current_class_instance == class_instance)
    {

        /* Point to next class instance.  */
        host_class -> ux_host_class_first_instance = next_class_instance;

        /* Return success.  */
        return(UX_SUCCESS);
    }

    /* Traverse the list of the class instances until we found the right one.  */
    while (*current_class_instance != UX_NULL)
    {

        /* Check to see if this class is the one we need to destroy.  */
        if(*current_class_instance == class_instance)
        {

            /* Point to next class instance.  */
            *current_class_instance =  next_class_instance;

            /* Return success.  */
            return(UX_SUCCESS);
        }

        /* Points to the next class instance.  */
        current_class_instance =  *current_class_instance;
    }

    /* Error trap. */
    _ux_system_error_handler(UX_SYSTEM_LEVEL_THREAD, UX_SYSTEM_CONTEXT_ENUMERATOR, UX_HOST_CLASS_INSTANCE_UNKNOWN);

    /* If trace is enabled, insert this event into the trace buffer.  */
    UX_TRACE_IN_LINE_INSERT(UX_TRACE_ERROR, UX_HOST_CLASS_INSTANCE_UNKNOWN, class_instance, 0, 0, UX_TRACE_ERRORS, 0, 0)

    /* Return error to caller.  */
    return(UX_HOST_CLASS_INSTANCE_UNKNOWN);
}