#include "builtin.h"

#include "gettext.h"

#include "object-name.h"

#include "parse-options.h"

#include "range-diff.h"

#include "config.h"

#include "repository.h"

static const char * const builtin_range_diff_usage[] = {

N_("git range-diff [<options>] <old-base>..<old-tip> <new-base>..<new-tip>"),

N_("git range-diff [<options>] <old-tip>...<new-tip>"),

N_("git range-diff [<options>] <base> <old-tip> <new-tip>"),

NULL

};

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

{

  struct diff_options diffopt = { NULL };

  struct strvec other_arg = STRVEC_INIT;

  struct range_diff_options range_diff_opts = {

    .creation_factor = RANGE_DIFF_CREATION_FACTOR_DEFAULT,

    .diffopt = &diffopt,

    .other_arg = &other_arg

  };

  int simple_color = -1, left_only = 0, right_only = 0;

  struct option range_diff_options[] = {

    OPT_INTEGER(0, "creation-factor",

          &range_diff_opts.creation_factor,

          N_("percentage by which creation is weighted")),

    OPT_BOOL(0, "no-dual-color", &simple_color,

          N_("use simple diff colors")),

    OPT_PASSTHRU_ARGV(0, "notes", &other_arg,

          N_("notes"), N_("passed to 'git log'"),

          PARSE_OPT_OPTARG),

    OPT_BOOL(0, "left-only", &left_only,

       N_("only emit output related to the first range")),

    OPT_BOOL(0, "right-only", &right_only,

       N_("only emit output related to the second range")),

    OPT_END()

  };

  struct option *options;

  int i, dash_dash = -1, res = 0;

  struct strbuf range1 = STRBUF_INIT, range2 = STRBUF_INIT;

  struct object_id oid;

  const char *three_dots = NULL;

  git_config(git_diff_ui_config, NULL);

  repo_diff_setup(the_repository, &diffopt);

  options = add_diff_options(range_diff_options, &diffopt);

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

           builtin_range_diff_usage, PARSE_OPT_KEEP_DASHDASH);

  diff_setup_done(&diffopt);

  /* force color when --dual-color was used */

  if (!simple_color)

    diffopt.use_color = 1;

  for (i = 0; i < argc; i++)

    if (!strcmp(argv[i], "--")) {

      dash_dash = i;

      break;

    }

  if (dash_dash == 3 ||

      (dash_dash < 0 && argc > 2 &&

       !repo_get_oid_committish(the_repository, argv[0], &oid) &&

       !repo_get_oid_committish(the_repository, argv[1], &oid) &&

       !repo_get_oid_committish(the_repository, argv[2], &oid))) {

    if (dash_dash < 0)

      ; /* already validated arguments */

    else if (repo_get_oid_committish(the_repository, argv[0], &oid))

      usage_msg_optf(_("not a revision: '%s'"),

               builtin_range_diff_usage, options,

               argv[0]);

    else if (repo_get_oid_committish(the_repository, argv[1], &oid))

      usage_msg_optf(_("not a revision: '%s'"),

               builtin_range_diff_usage, options,

               argv[1]);

    else if (repo_get_oid_committish(the_repository, argv[2], &oid))

      usage_msg_optf(_("not a revision: '%s'"),

               builtin_range_diff_usage, options,

               argv[2]);

    strbuf_addf(&range1, "%s..%s", argv[0], argv[1]);

    strbuf_addf(&range2, "%s..%s", argv[0], argv[2]);

    strvec_pushv(&other_arg, argv +

           (dash_dash < 0 ? 3 : dash_dash));

  } else if (dash_dash == 2 ||

       (dash_dash < 0 && argc > 1 &&

        is_range_diff_range(argv[0]) &&

        is_range_diff_range(argv[1]))) {

    if (dash_dash < 0)

      ; /* already validated arguments */

    else if (!is_range_diff_range(argv[0]))

      usage_msg_optf(_("not a commit range: '%s'"),

               builtin_range_diff_usage, options,

               argv[0]);

    else if (!is_range_diff_range(argv[1]))

      usage_msg_optf(_("not a commit range: '%s'"),

               builtin_range_diff_usage, options,

               argv[1]);

    strbuf_addstr(&range1, argv[0]);

    strbuf_addstr(&range2, argv[1]);

    strvec_pushv(&other_arg, argv +

           (dash_dash < 0 ? 2 : dash_dash));

  } else if (dash_dash == 1 ||

       (dash_dash < 0 && argc > 0 &&

        (three_dots = strstr(argv[0], "...")))) {

    const char *a, *b;

    int a_len;

    if (dash_dash < 0)

      ; /* already validated arguments */

    else if (!(three_dots = strstr(argv[0], "...")))

      usage_msg_optf(_("not a symmetric range: '%s'"),

           builtin_range_diff_usage, options,

           argv[0]);

    if (three_dots == argv[0]) {

      a = "HEAD";

      a_len = strlen(a);

    } else {

      a = argv[0];

      a_len = (int)(three_dots - a);

    }

    if (three_dots[3])

      b = three_dots + 3;

    else

      b = "HEAD";

    strbuf_addf(&range1, "%s..%.*s", b, a_len, a);

    strbuf_addf(&range2, "%.*s..%s", a_len, a, b);

    strvec_pushv(&other_arg, argv +

           (dash_dash < 0 ? 1 : dash_dash));

  } else

    usage_msg_opt(_("need two commit ranges"),

            builtin_range_diff_usage, options);

  FREE_AND_NULL(options);

  range_diff_opts.dual_color = simple_color < 1;

  range_diff_opts.left_only = left_only;

  range_diff_opts.right_only = right_only;

  res = show_range_diff(range1.buf, range2.buf, &range_diff_opts);

  strvec_clear(&other_arg);

  strbuf_release(&range1);

  strbuf_release(&range2);

  return res;

}