#ifndef SEQUENCER_H
#define SEQUENCER_H

#include "cache.h"
#include "strbuf.h"

struct commit;
struct repository;

const char *git_path_commit_editmsg(void);
const char *git_path_seq_dir(void);
const char *rebase_path_todo(void);

#define APPEND_SIGNOFF_DEDUP (1u << 0)

enum replay_action {
        REPLAY_REVERT,
        REPLAY_PICK,
        REPLAY_INTERACTIVE_REBASE
};

enum commit_msg_cleanup_mode {
        COMMIT_MSG_CLEANUP_SPACE,
        COMMIT_MSG_CLEANUP_NONE,
        COMMIT_MSG_CLEANUP_SCISSORS,
        COMMIT_MSG_CLEANUP_ALL
};

struct replay_opts {
        enum replay_action action;

        /* Boolean options */
        int edit;
        int record_origin;
        int no_commit;
        int signoff;
        int allow_ff;
        int allow_rerere_auto;
        int allow_empty;
        int allow_empty_message;
        int keep_redundant_commits;
        int verbose;

        int mainline;

        char *gpg_sign;
        enum commit_msg_cleanup_mode default_msg_cleanup;

        /* Merge strategy */
        char *strategy;
        char **xopts;
        size_t xopts_nr, xopts_alloc;

        /* Used by fixup/squash */
        struct strbuf current_fixups;
        int current_fixup_count;

        /* placeholder commit for -i --root */
        struct object_id squash_onto;
        int have_squash_onto;

        /* Only used by REPLAY_NONE */
        struct rev_info *revs;
};
#define REPLAY_OPTS_INIT { .action = -1, .current_fixups = STRBUF_INIT }

enum missing_commit_check_level {
        MISSING_COMMIT_CHECK_IGNORE = 0,
        MISSING_COMMIT_CHECK_WARN,
        MISSING_COMMIT_CHECK_ERROR
};

int write_message(const void *buf, size_t len, const char *filename,
                  int append_eol);

/*
 * Note that ordering matters in this enum. Not only must it match the mapping
 * of todo_command_info (in sequencer.c), it is also divided into several
 * sections that matter.  When adding new commands, make sure you add it in the
 * right section.
 */
enum todo_command {
        /* commands that handle commits */
        TODO_PICK = 0,
        TODO_REVERT,
        TODO_EDIT,
        TODO_REWORD,
        TODO_FIXUP,
        TODO_SQUASH,
        /* commands that do something else than handling a single commit */
        TODO_EXEC,
        TODO_BREAK,
        TODO_LABEL,
        TODO_RESET,
        TODO_MERGE,
        /* commands that do nothing but are counted for reporting progress */
        TODO_NOOP,
        TODO_DROP,
        /* comments (not counted for reporting progress) */
        TODO_COMMENT
};

struct todo_item {
        enum todo_command command;
        struct commit *commit;
        unsigned int flags;
        int arg_len;
        /* The offset of the command and its argument in the strbuf */
        size_t offset_in_buf, arg_offset;
};

struct todo_list {
        struct strbuf buf;
        struct todo_item *items;
        int nr, alloc, current;
        int done_nr, total_nr;
        struct stat_data stat;
};

#define TODO_LIST_INIT { STRBUF_INIT }

int todo_list_parse_insn_buffer(struct repository *r, char *buf,
                                struct todo_list *todo_list);
int todo_list_write_to_file(struct repository *r, struct todo_list *todo_list,
                            const char *file, const char *shortrevisions,
                            const char *shortonto, int num, unsigned flags);
void todo_list_release(struct todo_list *todo_list);
const char *todo_item_get_arg(struct todo_list *todo_list,
                              struct todo_item *item);

/* Call this to setup defaults before parsing command line options */
void sequencer_init_config(struct replay_opts *opts);
int sequencer_pick_revisions(struct repository *repo,
                             struct replay_opts *opts);
int sequencer_continue(struct repository *repo, struct replay_opts *opts);
int sequencer_rollback(struct repository *repo, struct replay_opts *opts);
int sequencer_remove_state(struct replay_opts *opts);

#define TODO_LIST_KEEP_EMPTY (1U << 0)
#define TODO_LIST_SHORTEN_IDS (1U << 1)
#define TODO_LIST_ABBREVIATE_CMDS (1U << 2)
#define TODO_LIST_REBASE_MERGES (1U << 3)
/*
 * When rebasing merges, commits that do have the base commit as ancestor
 * ("cousins") are *not* rebased onto the new base by default. If those
 * commits should be rebased onto the new base, this flag needs to be passed.
 */
#define TODO_LIST_REBASE_COUSINS (1U << 4)
#define TODO_LIST_APPEND_TODO_HELP (1U << 5)

int sequencer_make_script(struct repository *r, FILE *out, int argc,
                          const char **argv,
                          unsigned flags);

int sequencer_add_exec_commands(struct repository *r, const char *command);
int transform_todo_file(struct repository *r, unsigned flags);
enum missing_commit_check_level get_missing_commit_check_level(void);
int check_todo_list(struct repository *r);
int complete_action(struct repository *r, struct replay_opts *opts, unsigned flags,
                    const char *shortrevisions, const char *onto_name,
                    const char *onto, const char *orig_head, const char *cmd,
                    unsigned autosquash);
int rearrange_squash(struct repository *r);

extern const char sign_off_header[];

/*
 * Append a signoff to the commit message in "msgbuf". The ignore_footer
 * parameter specifies the number of bytes at the end of msgbuf that should
 * not be considered at all. I.e., they are not checked for existing trailers,
 * and the new signoff will be spliced into the buffer before those bytes.
 */
void append_signoff(struct strbuf *msgbuf, size_t ignore_footer, unsigned flag);

void append_conflicts_hint(struct index_state *istate, struct strbuf *msgbuf);
int message_is_empty(const struct strbuf *sb,
                     enum commit_msg_cleanup_mode cleanup_mode);
int template_untouched(const struct strbuf *sb, const char *template_file,
                       enum commit_msg_cleanup_mode cleanup_mode);
int update_head_with_reflog(const struct commit *old_head,
                            const struct object_id *new_head,
                            const char *action, const struct strbuf *msg,
                            struct strbuf *err);
void commit_post_rewrite(const struct commit *current_head,
                         const struct object_id *new_head);

int prepare_branch_to_be_rebased(struct replay_opts *opts, const char *commit);

#define SUMMARY_INITIAL_COMMIT   (1 << 0)
#define SUMMARY_SHOW_AUTHOR_DATE (1 << 1)
void print_commit_summary(struct repository *repo,
                          const char *prefix,
                          const struct object_id *oid,
                          unsigned int flags);

int read_author_script(const char *path, char **name, char **email, char **date,
                       int allow_missing);
#endif

void parse_strategy_opts(struct replay_opts *opts, char *raw_opts);
int write_basic_state(struct replay_opts *opts, const char *head_name,
                      const char *onto, const char *orig_head);