/* vifm
 * Copyright (C) 2013 xaizek.
 *
 * 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.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
 */

#ifndef VIFM__IO__IOC_H__
#define VIFM__IO__IOC_H__

#include <sys/types.h> /* gid_t mode_t uid_t */

#include "ioe.h"

/* ioc - I/O common - Input/Output common */

/* Conflict resolution strategy.  Defines what to do if destination path already
 * exists. */
typedef enum
{
	/* Abort operation if destination already exists. */
	IO_CRS_FAIL,

	/* Replace all existing items and remove excess ones. */
	IO_CRS_REPLACE_ALL,

	/* Overwrite files existing at destination. */
	IO_CRS_REPLACE_FILES,

	/* Appends the reset of data to files at destination (assumes previously
	 * terminated operation). */
	IO_CRS_APPEND_TO_FILES,
}
IoCrs;

/* Result of trying to execute an operation. */
typedef enum
{
	IO_RES_SUCCEEDED, /* Operation has succeeded. */
	IO_RES_SKIPPED,   /* Operation was rejected by the user. */
	IO_RES_FAILED,    /* Operation has failed. */
	IO_RES_ABORTED,   /* Failure should be propagated up. */
}
IoRes;

/* Forward declaration for io_confirm. */
typedef struct io_args_t io_args_t;

/* Type for file overwrite confirmation requests.  Should return non-zero on
 * positive response and zero otherwise. */
typedef int (*io_confirm)(io_args_t *args, const char src[], const char dst[]);

/* Type for hook responsible for querying cancellation status.  Should return
 * non-zero if operation is to be cancelled and zero otherwise. */
typedef int (*io_cancellation_hook)(void *arg);

/* Type of I/O operation result. */
typedef struct
{
	/* Pointer to a function that gets called when operation fails due to
	 * unexpected error. */
	ioerr_cb errors_cb;
	/* Output list of errors, which should be initialized by the caller to make
	 * use of it.  Must be released afterwards. */
	ioe_errlst_t errors;
}
io_result_t;

/* Cancellation settings for I/O operations. */
typedef struct
{
	io_cancellation_hook hook; /* Hook to query cancellation state. */
	void *arg;                 /* Parameter for the hook. */
}
io_cancellation_t;

struct io_args_t
{
	union
	{
		const char *path;
		const char *src;
	}
	arg1;

	union
	{
		const char *dst;
		const char *target;

		/* Whether operation should consider parent elements of path. */
		int process_parents;
	}
	arg2;

	union
	{
		/* Conflict resolution strategy. */
		IoCrs crs;

		mode_t mode;
#ifndef _WIN32
		uid_t uid;
		gid_t gid;
#endif
	}
	arg3;

	union
	{
		struct
		{
			/* Whether try to use O(1) file cloning feature of btrfs. */
			unsigned int fast_file_cloning : 1;
			/* Whether to call fdatasync() periodically. */
			unsigned int data_sync : 1;
		};
	}
	arg4;

	/* Provides means for cancellation checking. */
	io_cancellation_t cancellation;

	/* File overwrite confirmation callback.  Set to NULL to silently
	 * overwrite. */
	io_confirm confirm;

	/* Set to NULL to do not use estimates. */
	struct ioeta_estim_t *estim;

	/* Output of the operation after it finishes. */
	io_result_t result;
};

#endif /* VIFM__IO__IOC_H__ */

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