/*
 * Copyright (C) the libgit2 contributors. All rights reserved.
 *
 * This file is part of libgit2, distributed under the GNU GPL v2 with
 * a Linking Exception. For full terms see the included COPYING file.
 */
#ifndef INCLUDE_git_stash_h__
#define INCLUDE_git_stash_h__

#include "common.h"
#include "types.h"
#include "checkout.h"

/**
 * @file git2/stash.h
 * @brief Git stash management routines
 * @ingroup Git
 * @{
 */
GIT_BEGIN_DECL

/**
 * Stash flags
 */
typedef enum {
	/**
	 * No option, default
	 */
	GIT_STASH_DEFAULT = 0,

	/**
	 * All changes already added to the index are left intact in
	 * the working directory
	 */
	GIT_STASH_KEEP_INDEX = (1 << 0),

	/**
	 * All untracked files are also stashed and then cleaned up
	 * from the working directory
	 */
	GIT_STASH_INCLUDE_UNTRACKED = (1 << 1),

	/**
	 * All ignored files are also stashed and then cleaned up from
	 * the working directory
	 */
	GIT_STASH_INCLUDE_IGNORED = (1 << 2),
} git_stash_flags;

/**
 * Save the local modifications to a new stash.
 *
 * @param out Object id of the commit containing the stashed state.
 * This commit is also the target of the direct reference refs/stash.
 *
 * @param repo The owning repository.
 *
 * @param stasher The identity of the person performing the stashing.
 *
 * @param message Optional description along with the stashed state.
 *
 * @param flags Flags to control the stashing process. (see GIT_STASH_* above)
 *
 * @return 0 on success, GIT_ENOTFOUND where there's nothing to stash,
 * or error code.
 */
GIT_EXTERN(int) git_stash_save(
	git_oid *out,
	git_repository *repo,
	const git_signature *stasher,
	const char *message,
	uint32_t flags);

/** Stash application flags. */
typedef enum {
	GIT_STASH_APPLY_DEFAULT = 0,

	/* Try to reinstate not only the working tree's changes,
	 * but also the index's changes.
	 */
	GIT_STASH_APPLY_REINSTATE_INDEX = (1 << 0),
} git_stash_apply_flags;

/** Stash apply progression states */
typedef enum {
	GIT_STASH_APPLY_PROGRESS_NONE = 0,

	/** Loading the stashed data from the object database. */
	GIT_STASH_APPLY_PROGRESS_LOADING_STASH,

	/** The stored index is being analyzed. */
	GIT_STASH_APPLY_PROGRESS_ANALYZE_INDEX,

	/** The modified files are being analyzed. */
	GIT_STASH_APPLY_PROGRESS_ANALYZE_MODIFIED,

	/** The untracked and ignored files are being analyzed. */
	GIT_STASH_APPLY_PROGRESS_ANALYZE_UNTRACKED,

	/** The untracked files are being written to disk. */
	GIT_STASH_APPLY_PROGRESS_CHECKOUT_UNTRACKED,

	/** The modified files are being written to disk. */
	GIT_STASH_APPLY_PROGRESS_CHECKOUT_MODIFIED,

	/** The stash was applied successfully. */
	GIT_STASH_APPLY_PROGRESS_DONE,
} git_stash_apply_progress_t;

/**
 * Stash application progress notification function.
 * Return 0 to continue processing, or a negative value to
 * abort the stash application.
 */
typedef int GIT_CALLBACK(git_stash_apply_progress_cb)(
	git_stash_apply_progress_t progress,
	void *payload);

/**
 * Stash application options structure
 *
 * Initialize with `GIT_STASH_APPLY_OPTIONS_INIT`. Alternatively, you can
 * use `git_stash_apply_options_init`.
 *
 */
typedef struct git_stash_apply_options {
	unsigned int version;

	/** See `git_stash_apply_flags`, above. */
	uint32_t flags;

	/** Options to use when writing files to the working directory. */
	git_checkout_options checkout_options;

	/** Optional callback to notify the consumer of application progress. */
	git_stash_apply_progress_cb progress_cb;
	void *progress_payload;
} git_stash_apply_options;

#define GIT_STASH_APPLY_OPTIONS_VERSION 1
#define GIT_STASH_APPLY_OPTIONS_INIT { \
	GIT_STASH_APPLY_OPTIONS_VERSION, \
	GIT_STASH_APPLY_DEFAULT, \
	GIT_CHECKOUT_OPTIONS_INIT }

/**
 * Initialize git_stash_apply_options structure
 *
 * Initializes a `git_stash_apply_options` with default values. Equivalent to
 * creating an instance with `GIT_STASH_APPLY_OPTIONS_INIT`.
 *
 * @param opts The `git_stash_apply_options` struct to initialize.
 * @param version The struct version; pass `GIT_STASH_APPLY_OPTIONS_VERSION`.
 * @return Zero on success; -1 on failure.
 */
GIT_EXTERN(int) git_stash_apply_options_init(
	git_stash_apply_options *opts, unsigned int version);

/**
 * Apply a single stashed state from the stash list.
 *
 * If local changes in the working directory conflict with changes in the
 * stash then GIT_EMERGECONFLICT will be returned.  In this case, the index
 * will always remain unmodified and all files in the working directory will
 * remain unmodified.  However, if you are restoring untracked files or
 * ignored files and there is a conflict when applying the modified files,
 * then those files will remain in the working directory.
 *
 * If passing the GIT_STASH_APPLY_REINSTATE_INDEX flag and there would be
 * conflicts when reinstating the index, the function will return
 * GIT_EMERGECONFLICT and both the working directory and index will be left
 * unmodified.
 *
 * Note that a minimum checkout strategy of `GIT_CHECKOUT_SAFE` is implied.
 *
 * @param repo The owning repository.
 * @param index The position within the stash list. 0 points to the
 *              most recent stashed state.
 * @param options Optional options to control how stashes are applied.
 *
 * @return 0 on success, GIT_ENOTFOUND if there's no stashed state for the
 *         given index, GIT_EMERGECONFLICT if changes exist in the working
 *         directory, or an error code
 */
GIT_EXTERN(int) git_stash_apply(
	git_repository *repo,
	size_t index,
	const git_stash_apply_options *options);

/**
 * This is a callback function you can provide to iterate over all the
 * stashed states that will be invoked per entry.
 *
 * @param index The position within the stash list. 0 points to the
 *              most recent stashed state.
 * @param message The stash message.
 * @param stash_id The commit oid of the stashed state.
 * @param payload Extra parameter to callback function.
 * @return 0 to continue iterating or non-zero to stop.
 */
typedef int GIT_CALLBACK(git_stash_cb)(
	size_t index,
	const char* message,
	const git_oid *stash_id,
	void *payload);

/**
 * Loop over all the stashed states and issue a callback for each one.
 *
 * If the callback returns a non-zero value, this will stop looping.
 *
 * @param repo Repository where to find the stash.
 *
 * @param callback Callback to invoke per found stashed state. The most
 *                 recent stash state will be enumerated first.
 *
 * @param payload Extra parameter to callback function.
 *
 * @return 0 on success, non-zero callback return value, or error code.
 */
GIT_EXTERN(int) git_stash_foreach(
	git_repository *repo,
	git_stash_cb callback,
	void *payload);

/**
 * Remove a single stashed state from the stash list.
 *
 * @param repo The owning repository.
 *
 * @param index The position within the stash list. 0 points to the
 * most recent stashed state.
 *
 * @return 0 on success, GIT_ENOTFOUND if there's no stashed state for the given
 * index, or error code.
 */
GIT_EXTERN(int) git_stash_drop(
	git_repository *repo,
	size_t index);

/**
 * Apply a single stashed state from the stash list and remove it from the list
 * if successful.
 *
 * @param repo The owning repository.
 * @param index The position within the stash list. 0 points to the
 *              most recent stashed state.
 * @param options Optional options to control how stashes are applied.
 *
 * @return 0 on success, GIT_ENOTFOUND if there's no stashed state for the given
 * index, or error code. (see git_stash_apply() above for details)
*/
GIT_EXTERN(int) git_stash_pop(
	git_repository *repo,
	size_t index,
	const git_stash_apply_options *options);

/** @} */
GIT_END_DECL
#endif
