/*
 * 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_branch_h__
#define INCLUDE_git_branch_h__

#include "common.h"
#include "oid.h"
#include "types.h"

/**
 * @file git2/branch.h
 * @brief Git branch parsing routines
 * @defgroup git_branch Git branch management
 * @ingroup Git
 * @{
 */
GIT_BEGIN_DECL

/**
 * Create a new branch pointing at a target commit
 *
 * A new direct reference will be created pointing to
 * this target commit. If `force` is true and a reference
 * already exists with the given name, it'll be replaced.
 *
 * The returned reference must be freed by the user.
 *
 * The branch name will be checked for validity.
 * See `git_tag_create()` for rules about valid names.
 *
 * @param out Pointer where to store the underlying reference.
 *
 * @param branch_name Name for the branch; this name is
 * validated for consistency. It should also not conflict with
 * an already existing branch name.
 *
 * @param target Commit to which this branch should point. This object
 * must belong to the given `repo`.
 *
 * @param force Overwrite existing branch.
 *
 * @return 0, GIT_EINVALIDSPEC or an error code.
 * A proper reference is written in the refs/heads namespace
 * pointing to the provided target commit.
 */
GIT_EXTERN(int) git_branch_create(
	git_reference **out,
	git_repository *repo,
	const char *branch_name,
	const git_commit *target,
	int force);

/**
 * Delete an existing branch reference.
 *
 * If the branch is successfully deleted, the passed reference
 * object will be invalidated. The reference must be freed manually
 * by the user.
 *
 * @param branch A valid reference representing a branch
 * @return 0 on success, or an error code.
 */
GIT_EXTERN(int) git_branch_delete(git_reference *branch);

/** Iterator type for branches */
typedef struct git_branch_iterator git_branch_iterator;

/**
 * Create an iterator which loops over the requested branches.
 *
 * @param out the iterator
 * @param repo Repository where to find the branches.
 * @param list_flags Filtering flags for the branch
 * listing. Valid values are GIT_BRANCH_LOCAL, GIT_BRANCH_REMOTE
 * or a combination of the two.
 *
 * @return 0 on success  or an error code
 */
GIT_EXTERN(int) git_branch_iterator_new(
	git_branch_iterator **out,
	git_repository *repo,
	git_branch_t list_flags);

/**
 * Retrieve the next branch from the iterator
 *
 * @param out the reference
 * @param out_type the type of branch (local or remote-tracking)
 * @param iter the branch iterator
 * @return 0 on success, GIT_ITEROVER if there are no more branches or an error code.
 */
GIT_EXTERN(int) git_branch_next(git_reference **out, git_branch_t *out_type, git_branch_iterator *iter);

/**
 * Free a branch iterator
 *
 * @param iter the iterator to free
 */
GIT_EXTERN(void) git_branch_iterator_free(git_branch_iterator *iter);

/**
 * Move/rename an existing local branch reference.
 *
 * The new branch name will be checked for validity.
 * See `git_tag_create()` for rules about valid names.
 *
 * @param branch Current underlying reference of the branch.
 *
 * @param new_branch_name Target name of the branch once the move
 * is performed; this name is validated for consistency.
 *
 * @param force Overwrite existing branch.
 *
 * @return 0 on success, GIT_EINVALIDSPEC or an error code.
 */
GIT_EXTERN(int) git_branch_move(
	git_reference **out,
	git_reference *branch,
	const char *new_branch_name,
	int force);

/**
 * Lookup a branch by its name in a repository.
 *
 * The generated reference must be freed by the user.
 *
 * The branch name will be checked for validity.
 * See `git_tag_create()` for rules about valid names.
 *
 * @param out pointer to the looked-up branch reference
 *
 * @param repo the repository to look up the branch
 *
 * @param branch_name Name of the branch to be looked-up;
 * this name is validated for consistency.
 *
 * @param branch_type Type of the considered branch. This should
 * be valued with either GIT_BRANCH_LOCAL or GIT_BRANCH_REMOTE.
 *
 * @return 0 on success; GIT_ENOTFOUND when no matching branch
 * exists, GIT_EINVALIDSPEC, otherwise an error code.
 */
GIT_EXTERN(int) git_branch_lookup(
	git_reference **out,
	git_repository *repo,
	const char *branch_name,
	git_branch_t branch_type);

/**
 * Return the name of the given local or remote branch.
 *
 * The name of the branch matches the definition of the name
 * for git_branch_lookup. That is, if the returned name is given
 * to git_branch_lookup() then the reference is returned that
 * was given to this function.
 *
 * @param out where the pointer of branch name is stored;
 * this is valid as long as the ref is not freed.
 * @param ref the reference ideally pointing to a branch
 *
 * @return 0 on success; otherwise an error code (e.g., if the
 *  ref is no local or remote branch).
 */
GIT_EXTERN(int) git_branch_name(const char **out,
		git_reference *ref);

/**
 * Return the reference supporting the remote tracking branch,
 * given a local branch reference.
 *
 * @param out Pointer where to store the retrieved
 * reference.
 *
 * @param branch Current underlying reference of the branch.
 *
 * @return 0 on success; GIT_ENOTFOUND when no remote tracking
 * reference exists, otherwise an error code.
 */
GIT_EXTERN(int) git_branch_upstream(
	git_reference **out,
	git_reference *branch);

/**
 * Set the upstream configuration for a given local branch
 *
 * @param branch the branch to configure
 *
 * @param upstream_name remote-tracking or local branch to set as
 * upstream. Pass NULL to unset.
 *
 * @return 0 or an error code
 */
GIT_EXTERN(int) git_branch_set_upstream(git_reference *branch, const char *upstream_name);

/**
 * Return the name of the reference supporting the remote tracking branch,
 * given the name of a local branch reference.
 *
 * @param tracking_branch_name_out The user-allocated buffer which will be
 *     filled with the name of the reference. Pass NULL if you just want to
 *     get the needed size of the name of the reference as the output value.
 *
 * @param buffer_size Size of the `out` buffer in bytes.
 *
 * @param repo the repository where the branches live
 *
 * @param canonical_branch_name name of the local branch.
 *
 * @return number of characters in the reference name
 *     including the trailing NUL byte; GIT_ENOTFOUND when no remote tracking
 *     reference exists, otherwise an error code.
 */
GIT_EXTERN(int) git_branch_upstream_name(
	char *tracking_branch_name_out,
	size_t buffer_size,
	git_repository *repo,
	const char *canonical_branch_name);

/**
 * Determine if the current local branch is pointed at by HEAD.
 *
 * @param branch Current underlying reference of the branch.
 *
 * @return 1 if HEAD points at the branch, 0 if it isn't,
 * error code otherwise.
 */
GIT_EXTERN(int) git_branch_is_head(
	git_reference *branch);

/**
 * Return the name of remote that the remote tracking branch belongs to.
 *
 * @param remote_name_out The user-allocated buffer which will be
 *     filled with the name of the remote. Pass NULL if you just want to
 *     get the needed size of the name of the remote as the output value.
 *
 * @param buffer_size Size of the `out` buffer in bytes.
 *
 * @param repo The repository where the branch lives.
 *
 * @param canonical_branch_name name of the remote tracking branch.
 *
 * @return Number of characters in the reference name
 *     including the trailing NUL byte; GIT_ENOTFOUND
 *     when no remote matching remote was found,
 *     GIT_EAMBIGUOUS when the branch maps to several remotes,
 *     otherwise an error code.
 */
GIT_EXTERN(int) git_branch_remote_name(
	char *remote_name_out,
	size_t buffer_size,
	git_repository *repo,
	const char *canonical_branch_name);

/** @} */
GIT_END_DECL
#endif
