#include "builtin.h"

#include "commit.h"

#include "config.h"

#include "environment.h"

#include "gettext.h"

#include "hex.h"

#include "parse-options.h"

#include "repository.h"

#include "commit-graph.h"

#include "object-store-ll.h"

#include "progress.h"

#include "replace-object.h"

#include "strbuf.h"

#include "tag.h"

#include "trace2.h"

#define BUILTIN_COMMIT_GRAPH_VERIFY_USAGE \

  N_("git commit-graph verify [--object-dir <dir>] [--shallow] [--[no-]progress]")

#define BUILTIN_COMMIT_GRAPH_WRITE_USAGE \

  N_("git commit-graph write [--object-dir <dir>] [--append]\n" \

     "                       [--split[=<strategy>]] [--reachable | --stdin-packs | --stdin-commits]\n" \

     "                       [--changed-paths] [--[no-]max-new-filters <n>] [--[no-]progress]\n" \

     "                       <split-options>")

static const char * builtin_commit_graph_verify_usage[] = {

  BUILTIN_COMMIT_GRAPH_VERIFY_USAGE,

  NULL

};

static const char * builtin_commit_graph_write_usage[] = {

  BUILTIN_COMMIT_GRAPH_WRITE_USAGE,

  NULL

};

static char const * const builtin_commit_graph_usage[] = {

  BUILTIN_COMMIT_GRAPH_VERIFY_USAGE,

  BUILTIN_COMMIT_GRAPH_WRITE_USAGE,

  NULL,

};

static struct opts_commit_graph {

  const char *obj_dir;

  int reachable;

  int stdin_packs;

  int stdin_commits;

  int append;

  int split;

  int shallow;

  int progress;

  int enable_changed_paths;

} opts;

static struct option common_opts[] = {

  OPT_STRING(0, "object-dir", &opts.obj_dir,

       N_("dir"),

       N_("the object directory to store the graph")),

  OPT_END()

};

static struct option *add_common_options(struct option *to)

{

  return parse_options_concat(common_opts, to);

}

static int graph_verify(int argc, const char **argv, const char *prefix)

{

  struct commit_graph *graph = NULL;

  struct object_directory *odb = NULL;

  char *graph_name;

  char *chain_name;

  enum { OPENED_NONE, OPENED_GRAPH, OPENED_CHAIN } opened = OPENED_NONE;

  int fd;

  struct stat st;

  int flags = 0;

  int incomplete_chain = 0;

  int ret;

  static struct option builtin_commit_graph_verify_options[] = {

    OPT_BOOL(0, "shallow", &opts.shallow,

       N_("if the commit-graph is split, only verify the tip file")),

    OPT_BOOL(0, "progress", &opts.progress,

       N_("force progress reporting")),

    OPT_END(),

  };

  struct option *options = add_common_options(builtin_commit_graph_verify_options);

  trace2_cmd_mode("verify");

  opts.progress = isatty(2);

  argc = parse_options(argc, argv, prefix,

           options,

           builtin_commit_graph_verify_usage, 0);

  if (argc)

    usage_with_options(builtin_commit_graph_verify_usage, options);

  if (!opts.obj_dir)

    opts.obj_dir = get_object_directory();

  if (opts.shallow)

    flags |= COMMIT_GRAPH_VERIFY_SHALLOW;

  if (opts.progress)

    flags |= COMMIT_GRAPH_WRITE_PROGRESS;

  odb = find_odb(the_repository, opts.obj_dir);

  graph_name = get_commit_graph_filename(odb);

  chain_name = get_commit_graph_chain_filename(odb);

  if (open_commit_graph(graph_name, &fd, &st))

    opened = OPENED_GRAPH;

  else if (errno != ENOENT)

    die_errno(_("Could not open commit-graph '%s'"), graph_name);

  else if (open_commit_graph_chain(chain_name, &fd, &st))

    opened = OPENED_CHAIN;

  else if (errno != ENOENT)

    die_errno(_("could not open commit-graph chain '%s'"), chain_name);

  FREE_AND_NULL(graph_name);

  FREE_AND_NULL(chain_name);

  FREE_AND_NULL(options);

  if (opened == OPENED_NONE)

    return 0;

  else if (opened == OPENED_GRAPH)

    graph = load_commit_graph_one_fd_st(the_repository, fd, &st, odb);

  else

    graph = load_commit_graph_chain_fd_st(the_repository, fd, &st,

                  &incomplete_chain);

  if (!graph)

    return 1;

  ret = verify_commit_graph(the_repository, graph, flags);

  free_commit_graph(graph);

  if (incomplete_chain) {

    error("one or more commit-graph chain files could not be loaded");

    ret |= 1;

  }

  return ret;

}

extern int read_replace_refs;

static struct commit_graph_opts write_opts;

static int write_option_parse_split(const struct option *opt, const char *arg,

            int unset)

{

  enum commit_graph_split_flags *flags = opt->value;

  BUG_ON_OPT_NEG(unset);

  opts.split = 1;

  if (!arg)

    return 0;

  if (!strcmp(arg, "no-merge"))

    *flags = COMMIT_GRAPH_SPLIT_MERGE_PROHIBITED;

  else if (!strcmp(arg, "replace"))

    *flags = COMMIT_GRAPH_SPLIT_REPLACE;

  else

    die(_("unrecognized --split argument, %s"), arg);

  return 0;

}

static int read_one_commit(struct oidset *commits, struct progress *progress,

         const char *hash)

{

  struct object *result;

  struct object_id oid;

  const char *end;

  if (parse_oid_hex(hash, &oid, &end))

    return error(_("unexpected non-hex object ID: %s"), hash);

  result = deref_tag(the_repository, parse_object(the_repository, &oid),

         NULL, 0);

  if (!result)

    return error(_("invalid object: %s"), hash);

  else if (object_as_type(result, OBJ_COMMIT, 1))

    oidset_insert(commits, &result->oid);

  display_progress(progress, oidset_size(commits));

  return 0;

}

static int write_option_max_new_filters(const struct option *opt,

          const char *arg,

          int unset)

{

  int *to = opt->value;

  if (unset)

    *to = -1;

  else {

    const char *s;

    *to = strtol(arg, (char **)&s, 10);

    if (*s)

      return error(_("option `%s' expects a numerical value"),

             "max-new-filters");

  }

  return 0;

}

static int git_commit_graph_write_config(const char *var, const char *value,

           const struct config_context *ctx,

           void *cb UNUSED)

{

  if (!strcmp(var, "commitgraph.maxnewfilters"))

    write_opts.max_new_filters = git_config_int(var, value, ctx->kvi);

  /*

   * No need to fall-back to 'git_default_config', since this was already

   * called in 'cmd_commit_graph()'.

   */

  return 0;

}

static int graph_write(int argc, const char **argv, const char *prefix)

{

  struct string_list pack_indexes = STRING_LIST_INIT_DUP;

  struct strbuf buf = STRBUF_INIT;

  struct oidset commits = OIDSET_INIT;

  struct object_directory *odb = NULL;

  int result = 0;

  enum commit_graph_write_flags flags = 0;

  struct progress *progress = NULL;

  static struct option builtin_commit_graph_write_options[] = {

    OPT_BOOL(0, "reachable", &opts.reachable,

      N_("start walk at all refs")),

    OPT_BOOL(0, "stdin-packs", &opts.stdin_packs,

      N_("scan pack-indexes listed by stdin for commits")),

    OPT_BOOL(0, "stdin-commits", &opts.stdin_commits,

      N_("start walk at commits listed by stdin")),

    OPT_BOOL(0, "append", &opts.append,

      N_("include all commits already in the commit-graph file")),

    OPT_BOOL(0, "changed-paths", &opts.enable_changed_paths,

      N_("enable computation for changed paths")),

    OPT_CALLBACK_F(0, "split", &write_opts.split_flags, NULL,

      N_("allow writing an incremental commit-graph file"),

      PARSE_OPT_OPTARG | PARSE_OPT_NONEG,

      write_option_parse_split),

    OPT_INTEGER(0, "max-commits", &write_opts.max_commits,

      N_("maximum number of commits in a non-base split commit-graph")),

    OPT_INTEGER(0, "size-multiple", &write_opts.size_multiple,

      N_("maximum ratio between two levels of a split commit-graph")),

    OPT_EXPIRY_DATE(0, "expire-time", &write_opts.expire_time,

      N_("only expire files older than a given date-time")),

    OPT_CALLBACK_F(0, "max-new-filters", &write_opts.max_new_filters,

      NULL, N_("maximum number of changed-path Bloom filters to compute"),

      0, write_option_max_new_filters),

    OPT_BOOL(0, "progress", &opts.progress,

       N_("force progress reporting")),

    OPT_END(),

  };

  struct option *options = add_common_options(builtin_commit_graph_write_options);

  opts.progress = isatty(2);

  opts.enable_changed_paths = -1;

  write_opts.size_multiple = 2;

  write_opts.max_commits = 0;

  write_opts.expire_time = 0;

  write_opts.max_new_filters = -1;

  trace2_cmd_mode("write");

  git_config(git_commit_graph_write_config, &opts);

  argc = parse_options(argc, argv, prefix,

           options,

           builtin_commit_graph_write_usage, 0);

  if (argc)

    usage_with_options(builtin_commit_graph_write_usage, options);

  if (opts.reachable + opts.stdin_packs + opts.stdin_commits > 1)

    die(_("use at most one of --reachable, --stdin-commits, or --stdin-packs"));

  if (!opts.obj_dir)

    opts.obj_dir = get_object_directory();

  if (opts.append)

    flags |= COMMIT_GRAPH_WRITE_APPEND;

  if (opts.split)

    flags |= COMMIT_GRAPH_WRITE_SPLIT;

  if (opts.progress)

    flags |= COMMIT_GRAPH_WRITE_PROGRESS;

  if (!opts.enable_changed_paths)

    flags |= COMMIT_GRAPH_NO_WRITE_BLOOM_FILTERS;

  if (opts.enable_changed_paths == 1 ||

      git_env_bool(GIT_TEST_COMMIT_GRAPH_CHANGED_PATHS, 0))

    flags |= COMMIT_GRAPH_WRITE_BLOOM_FILTERS;

  odb = find_odb(the_repository, opts.obj_dir);

  if (opts.reachable) {

    if (write_commit_graph_reachable(odb, flags, &write_opts))

      result = 1;

    goto cleanup;

  }

  if (opts.stdin_packs) {

    while (strbuf_getline(&buf, stdin) != EOF)

      string_list_append_nodup(&pack_indexes,

             strbuf_detach(&buf, NULL));

  } else if (opts.stdin_commits) {

    oidset_init(&commits, 0);

    if (opts.progress)

      progress = start_delayed_progress(

        _("Collecting commits from input"), 0);

    while (strbuf_getline(&buf, stdin) != EOF) {

      if (read_one_commit(&commits, progress, buf.buf)) {

        result = 1;

        goto cleanup;

      }

    }

    stop_progress(&progress);

  }

  if (write_commit_graph(odb,

             opts.stdin_packs ? &pack_indexes : NULL,

             opts.stdin_commits ? &commits : NULL,

             flags,

             &write_opts))

    result = 1;

cleanup:

  FREE_AND_NULL(options);

  string_list_clear(&pack_indexes, 0);

  strbuf_release(&buf);

  oidset_clear(&commits);

  return result;

}

int cmd_commit_graph(int argc, const char **argv, const char *prefix)

{

  parse_opt_subcommand_fn *fn = NULL;

  struct option builtin_commit_graph_options[] = {

    OPT_SUBCOMMAND("verify", &fn, graph_verify),

    OPT_SUBCOMMAND("write", &fn, graph_write),

    OPT_END(),

  };

  struct option *options = parse_options_concat(builtin_commit_graph_options, common_opts);

  git_config(git_default_config, NULL);

  disable_replace_refs();

  save_commit_buffer = 0;

  argc = parse_options(argc, argv, prefix, options,

           builtin_commit_graph_usage, 0);

  FREE_AND_NULL(options);

  return fn(argc, argv, prefix);

}