#include "git-compat-util.h"

#include "diff-merges.h"

#include "gettext.h"

#include "revision.h"

typedef void (*diff_merges_setup_func_t)(struct rev_info *);

static void set_separate(struct rev_info *revs);

static diff_merges_setup_func_t set_to_default = set_separate;

static int suppress_m_parsing;

static void suppress(struct rev_info *revs)

{

  revs->separate_merges = 0;

  revs->first_parent_merges = 0;

  revs->combine_merges = 0;

  revs->dense_combined_merges = 0;

  revs->combined_all_paths = 0;

  revs->merges_imply_patch = 0;

  revs->merges_need_diff = 0;

  revs->remerge_diff = 0;

}

static void common_setup(struct rev_info *revs)

{

  suppress(revs);

  revs->merges_need_diff = 1;

}

static void set_none(struct rev_info *revs)

{

  suppress(revs);

}

static void set_separate(struct rev_info *revs)

{

  common_setup(revs);

  revs->separate_merges = 1;

  revs->simplify_history = 0;

}

static void set_first_parent(struct rev_info *revs)

{

  set_separate(revs);

  revs->first_parent_merges = 1;

}

static void set_combined(struct rev_info *revs)

{

  common_setup(revs);

  revs->combine_merges = 1;

  revs->dense_combined_merges = 0;

}

static void set_dense_combined(struct rev_info *revs)

{

  common_setup(revs);

  revs->combine_merges = 1;

  revs->dense_combined_merges = 1;

}

static void set_remerge_diff(struct rev_info *revs)

{

  common_setup(revs);

  revs->remerge_diff = 1;

  revs->simplify_history = 0;

}

static diff_merges_setup_func_t func_by_opt(const char *optarg)

{

  if (!strcmp(optarg, "off") || !strcmp(optarg, "none"))

    return set_none;

  if (!strcmp(optarg, "1") || !strcmp(optarg, "first-parent"))

    return set_first_parent;

  if (!strcmp(optarg, "separate"))

    return set_separate;

  if (!strcmp(optarg, "c") || !strcmp(optarg, "combined"))

    return set_combined;

  if (!strcmp(optarg, "cc") || !strcmp(optarg, "dense-combined"))

    return set_dense_combined;

  if (!strcmp(optarg, "r") || !strcmp(optarg, "remerge"))

    return set_remerge_diff;

  if (!strcmp(optarg, "m") || !strcmp(optarg, "on"))

    return set_to_default;

  return NULL;

}

static void set_diff_merges(struct rev_info *revs, const char *optarg)

{

  diff_merges_setup_func_t func = func_by_opt(optarg);

  if (!func)

    die(_("invalid value for '%s': '%s'"), "--diff-merges", optarg);

  func(revs);

}

/*

 * Public functions. They are in the order they are called.

 */

int diff_merges_config(const char *value)

{

  diff_merges_setup_func_t func = func_by_opt(value);

  if (!func)

    return -1;

  set_to_default = func;

  return 0;

}

void diff_merges_suppress_m_parsing(void)

{

  suppress_m_parsing = 1;

}

int diff_merges_parse_opts(struct rev_info *revs, const char **argv)

{

  int argcount = 1;

  const char *optarg;

  const char *arg = argv[0];

  if (!suppress_m_parsing && !strcmp(arg, "-m")) {

    set_to_default(revs);

    revs->merges_need_diff = 0;

  } else if (!strcmp(arg, "-c")) {

    set_combined(revs);

    revs->merges_imply_patch = 1;

  } else if (!strcmp(arg, "--cc")) {

    set_dense_combined(revs);

    revs->merges_imply_patch = 1;

  } else if (!strcmp(arg, "--dd")) {

    set_first_parent(revs);

    revs->merges_imply_patch = 1;

  } else if (!strcmp(arg, "--remerge-diff")) {

    set_remerge_diff(revs);

    revs->merges_imply_patch = 1;

  } else if (!strcmp(arg, "--no-diff-merges")) {

    set_none(revs);

  } else if (!strcmp(arg, "--combined-all-paths")) {

    revs->combined_all_paths = 1;

  } else if ((argcount = parse_long_opt("diff-merges", argv, &optarg))) {

    set_diff_merges(revs, optarg);

  } else

    return 0;

  revs->explicit_diff_merges = 1;

  return argcount;

}

void diff_merges_suppress(struct rev_info *revs)

{

  set_none(revs);

}

void diff_merges_default_to_first_parent(struct rev_info *revs)

{

  if (!revs->explicit_diff_merges)

    revs->separate_merges = 1;

  if (revs->separate_merges)

    revs->first_parent_merges = 1;

}

void diff_merges_default_to_dense_combined(struct rev_info *revs)

{

  if (!revs->explicit_diff_merges)

    set_dense_combined(revs);

}

void diff_merges_set_dense_combined_if_unset(struct rev_info *revs)

{

  if (!revs->combine_merges)

    set_dense_combined(revs);

}

void diff_merges_setup_revs(struct rev_info *revs)

{

  if (revs->combine_merges == 0)

    revs->dense_combined_merges = 0;

  if (revs->separate_merges == 0)

    revs->first_parent_merges = 0;

  if (revs->combined_all_paths && !revs->combine_merges)

    die("--combined-all-paths makes no sense without -c or --cc");

  if (revs->merges_imply_patch)

    revs->diff = 1;

  if (revs->merges_imply_patch || revs->merges_need_diff) {

    if (!revs->diffopt.output_format)

      revs->diffopt.output_format = DIFF_FORMAT_PATCH;

  }

}