#define DISABLE_SIGN_COMPARE_WARNINGS

#include "git-compat-util.h"

#include "config.h"

#include "color.h"

#include "editor.h"

#include "gettext.h"

#include "hex-ll.h"

#include "pager.h"

#include "strbuf.h"

static enum git_colorbool git_use_color_default = GIT_COLOR_AUTO;

int color_stdout_is_tty = -1;

/*

 * The list of available column colors.

 */

const char *column_colors_ansi[] = {

  GIT_COLOR_RED,

  GIT_COLOR_GREEN,

  GIT_COLOR_YELLOW,

  GIT_COLOR_BLUE,

  GIT_COLOR_MAGENTA,

  GIT_COLOR_CYAN,

  GIT_COLOR_BOLD_RED,

  GIT_COLOR_BOLD_GREEN,

  GIT_COLOR_BOLD_YELLOW,

  GIT_COLOR_BOLD_BLUE,

  GIT_COLOR_BOLD_MAGENTA,

  GIT_COLOR_BOLD_CYAN,

  GIT_COLOR_RESET,

};

enum {

  COLOR_BACKGROUND_OFFSET = 10,

  COLOR_FOREGROUND_ANSI = 30,

  COLOR_FOREGROUND_RGB = 38,

  COLOR_FOREGROUND_256 = 38,

  COLOR_FOREGROUND_BRIGHT_ANSI = 90,

};

/* Ignore the RESET at the end when giving the size */

const int column_colors_ansi_max = ARRAY_SIZE(column_colors_ansi) - 1;

/* An individual foreground or background color. */

struct color {

  enum {

    COLOR_UNSPECIFIED = 0,

    COLOR_NORMAL,

    COLOR_ANSI, /* basic 0-7 ANSI colors + "default" (value = 9) */

    COLOR_256,

    COLOR_RGB

  } type;

  /* The numeric value for ANSI and 256-color modes */

  unsigned char value;

  /* 24-bit RGB color values */

  unsigned char red, green, blue;

};

/*

 * "word" is a buffer of length "len"; does it match the NUL-terminated

 * "match" exactly?

 */

static int match_word(const char *word, int len, const char *match)

{

  return !strncasecmp(word, match, len) && !match[len];

}

static int get_hex_color(const char **inp, int width, unsigned char *out)

{

  const char *in = *inp;

  unsigned int val;

  assert(width == 1 || width == 2);

  val = (hexval(in[0]) << 4) | hexval(in[width - 1]);

  if (val & ~0xff)

    return -1;

  *inp += width;

  *out = val;

  return 0;

}

/*

 * If an ANSI color is recognized in "name", fill "out" and return 0.

 * Otherwise, leave out unchanged and return -1.

 */

static int parse_ansi_color(struct color *out, const char *name, int len)

{

  /* Positions in array must match ANSI color codes */

  static const char * const color_names[] = {

    "black", "red", "green", "yellow",

    "blue", "magenta", "cyan", "white"

  };

  int i;

  int color_offset = COLOR_FOREGROUND_ANSI;

  if (match_word(name, len, "default")) {

    /*

     * Restores to the terminal's default color, which may not be

     * the same as explicitly setting "white" or "black".

     *

     * ECMA-48 - Control Functions \

     *  for Coded Character Sets, 5th edition (June 1991):

     * > 39 default display colour (implementation-defined)

     * > 49 default background colour (implementation-defined)

     *

     * Although not supported /everywhere/--according to terminfo,

     * some terminals define "op" (original pair) as a blunt

     * "set to white on black", or even "send full SGR reset"--

     * it's standard and well-supported enough that if a user

     * asks for it in their config this will do the right thing.

     */

    out->type = COLOR_ANSI;

    out->value = 9 + color_offset;

    return 0;

  }

  if (strncasecmp(name, "bright", 6) == 0) {

    color_offset = COLOR_FOREGROUND_BRIGHT_ANSI;

    name += 6;

    len -= 6;

  }

  for (i = 0; i < ARRAY_SIZE(color_names); i++) {

    if (match_word(name, len, color_names[i])) {

      out->type = COLOR_ANSI;

      out->value = i + color_offset;

      return 0;

    }

  }

  return -1;

}

static int parse_color(struct color *out, const char *name, int len)

{

  char *end;

  long val;

  /* First try the special word "normal"... */

  if (match_word(name, len, "normal")) {

    out->type = COLOR_NORMAL;

    return 0;

  }

  /* Try a 24- or 12-bit RGB value prefixed with '#' */

  if ((len == 7 || len == 4) && name[0] == '#') {

    int width_per_color = (len == 7) ? 2 : 1;

    const char *color = name + 1;

    if (!get_hex_color(&color, width_per_color, &out->red) &&

        !get_hex_color(&color, width_per_color, &out->green) &&

        !get_hex_color(&color, width_per_color, &out->blue)) {

      out->type = COLOR_RGB;

      return 0;

    }

  }

  /* Then pick from our human-readable color names... */

  if (parse_ansi_color(out, name, len) == 0) {

    return 0;

  }

  /* And finally try a literal 256-color-mode number */

  val = strtol(name, &end, 10);

  if (end - name == len) {

    /*

     * Allow "-1" as an alias for "normal", but other negative

     * numbers are bogus.

     */

    if (val < -1)

      ; /* fall through to error */

    else if (val < 0) {

      out->type = COLOR_NORMAL;

      return 0;

    /* Rewrite 0-7 as more-portable standard colors. */

    } else if (val < 8) {

      out->type = COLOR_ANSI;

      out->value = val + COLOR_FOREGROUND_ANSI;

      return 0;

    /* Rewrite 8-15 as more-portable aixterm colors. */

    } else if (val < 16) {

      out->type = COLOR_ANSI;

      out->value = val - 8 + COLOR_FOREGROUND_BRIGHT_ANSI;

      return 0;

    } else if (val < 256) {

      out->type = COLOR_256;

      out->value = val;

      return 0;

    }

  }

  return -1;

}

static int parse_attr(const char *name, size_t len)

{

  static const struct {

    const char *name;

    size_t len;

    int val, neg;

  } attrs[] = {

#define ATTR(x, val, neg) { (x), sizeof(x)-1, (val), (neg) }

    ATTR("bold",      1, 22),

    ATTR("dim",       2, 22),

    ATTR("italic",    3, 23),

    ATTR("ul",        4, 24),

    ATTR("blink",     5, 25),

    ATTR("reverse",   7, 27),

    ATTR("strike",    9, 29)

#undef ATTR

  };

  int negate = 0;

  int i;

  if (skip_prefix_mem(name, len, "no", &name, &len)) {

    skip_prefix_mem(name, len, "-", &name, &len);

    negate = 1;

  }

  for (i = 0; i < ARRAY_SIZE(attrs); i++) {

    if (attrs[i].len == len && !memcmp(attrs[i].name, name, len))

      return negate ? attrs[i].neg : attrs[i].val;

  }

  return -1;

}

int color_parse(const char *value, char *dst)

{

  return color_parse_mem(value, strlen(value), dst);

}

/*

 * Write the ANSI color codes for "c" to "out"; the string should

 * already have the ANSI escape code in it. "out" should have enough

 * space in it to fit any color.

 */

static char *color_output(char *out, int len, const struct color *c, int background)

{

  int offset = 0;

  if (background)

    offset = COLOR_BACKGROUND_OFFSET;

  switch (c->type) {

  case COLOR_UNSPECIFIED:

  case COLOR_NORMAL:

    break;

  case COLOR_ANSI:

    out += xsnprintf(out, len, "%d", c->value + offset);

    break;

  case COLOR_256:

    out += xsnprintf(out, len, "%d;5;%d", COLOR_FOREGROUND_256 + offset,

         c->value);

    break;

  case COLOR_RGB:

    out += xsnprintf(out, len, "%d;2;%d;%d;%d",

         COLOR_FOREGROUND_RGB + offset,

         c->red, c->green, c->blue);

    break;

  }

  return out;

}

static int color_empty(const struct color *c)

{

  return c->type <= COLOR_NORMAL;

}

int color_parse_mem(const char *value, int value_len, char *dst)

{

  const char *ptr = value;

  int len = value_len;

  char *end = dst + COLOR_MAXLEN;

  unsigned int has_reset = 0;

  unsigned int attr = 0;

  struct color fg = { COLOR_UNSPECIFIED };

  struct color bg = { COLOR_UNSPECIFIED };

  while (len > 0 && isspace(*ptr)) {

    ptr++;

    len--;

  }

  if (!len) {

    dst[0] = '\0';

    return 0;

  }

  /* [reset] [fg [bg]] [attr]... */

  while (len > 0) {

    const char *word = ptr;

    struct color c = { COLOR_UNSPECIFIED };

    int val, wordlen = 0;

    while (len > 0 && !isspace(word[wordlen])) {

      wordlen++;

      len--;

    }

    ptr = word + wordlen;

    while (len > 0 && isspace(*ptr)) {

      ptr++;

      len--;

    }

    if (match_word(word, wordlen, "reset")) {

      has_reset = 1;

      continue;

    }

    if (!parse_color(&c, word, wordlen)) {

      if (fg.type == COLOR_UNSPECIFIED) {

        fg = c;

        continue;

      }

      if (bg.type == COLOR_UNSPECIFIED) {

        bg = c;

        continue;

      }

      goto bad;

    }

    val = parse_attr(word, wordlen);

    if (0 <= val)

      attr |= (1 << val);

    else

      goto bad;

  }

#undef OUT

#define OUT(x) do { \

  if (dst == end) \

    BUG("color parsing ran out of space"); \

  *dst++ = (x); \

} while(0)

  if (has_reset || attr || !color_empty(&fg) || !color_empty(&bg)) {

    int sep = 0;

    int i;

    OUT('\033');

    OUT('[');

    if (has_reset)

      sep++;

    for (i = 0; attr; i++) {

      unsigned bit = (1 << i);

      if (!(attr & bit))

        continue;

      attr &= ~bit;

      if (sep++)

        OUT(';');

      dst += xsnprintf(dst, end - dst, "%d", i);

    }

    if (!color_empty(&fg)) {

      if (sep++)

        OUT(';');

      dst = color_output(dst, end - dst, &fg, 0);

    }

    if (!color_empty(&bg)) {

      if (sep++)

        OUT(';');

      dst = color_output(dst, end - dst, &bg, 1);

    }

    OUT('m');

  }

  OUT(0);

  return 0;

bad:

  return error(_("invalid color value: %.*s"), value_len, value);

#undef OUT

}

enum git_colorbool git_config_colorbool(const char *var, const char *value)

{

  if (value) {

    if (!strcasecmp(value, "never"))

      return GIT_COLOR_NEVER;

    if (!strcasecmp(value, "always"))

      return GIT_COLOR_ALWAYS;

    if (!strcasecmp(value, "auto"))

      return GIT_COLOR_AUTO;

  }

  if (!var)

    return GIT_COLOR_UNKNOWN;

  /* Missing or explicit false to turn off colorization */

  if (!git_config_bool(var, value))

    return GIT_COLOR_NEVER;

  /* any normal truth value defaults to 'auto' */

  return GIT_COLOR_AUTO;

}

static bool check_auto_color(int fd)

{

  static int color_stderr_is_tty = -1;

  int *is_tty_p = fd == 1 ? &color_stdout_is_tty : &color_stderr_is_tty;

  if (*is_tty_p < 0)

    *is_tty_p = isatty(fd);

  if (*is_tty_p || (fd == 1 && pager_in_use() && pager_use_color)) {

    if (!is_terminal_dumb())

      return true;

  }

  return false;

}

bool want_color_fd(int fd, enum git_colorbool var)

{

  /*

   * NEEDSWORK: This function is sometimes used from multiple threads, and

   * we end up using want_auto racily. That "should not matter" since

   * we always write the same value, but it's still wrong. This function

   * is listed in .tsan-suppressions for the time being.

   */

  static int want_auto[3] = { -1, -1, -1 };

  if (fd < 1 || fd >= ARRAY_SIZE(want_auto))

    BUG("file descriptor out of range: %d", fd);

  if (var == GIT_COLOR_UNKNOWN)

    var = git_use_color_default;

  if (var == GIT_COLOR_AUTO) {

    if (want_auto[fd] < 0)

      want_auto[fd] = check_auto_color(fd);

    return want_auto[fd];

  }

  return var == GIT_COLOR_ALWAYS;

}

int git_color_config(const char *var, const char *value, void *cb UNUSED)

{

  if (!strcmp(var, "color.ui")) {

    git_use_color_default = git_config_colorbool(var, value);

    return 0;

  }

  return 0;

}

void color_print_strbuf(FILE *fp, const char *color, const struct strbuf *sb)

{

  if (*color)

    fprintf(fp, "%s", color);

  fprintf(fp, "%s", sb->buf);

  if (*color)

    fprintf(fp, "%s", GIT_COLOR_RESET);

}

static int color_vfprintf(FILE *fp, const char *color, const char *fmt,

    va_list args, const char *trail)

{

  int r = 0;

  if (*color)

    r += fprintf(fp, "%s", color);

  r += vfprintf(fp, fmt, args);

  if (*color)

    r += fprintf(fp, "%s", GIT_COLOR_RESET);

  if (trail)

    r += fprintf(fp, "%s", trail);

  return r;

}

int color_fprintf(FILE *fp, const char *color, const char *fmt, ...)

{

  va_list args;

  int r;

  va_start(args, fmt);

  r = color_vfprintf(fp, color, fmt, args, NULL);

  va_end(args);

  return r;

}

int color_fprintf_ln(FILE *fp, const char *color, const char *fmt, ...)

{

  va_list args;

  int r;

  va_start(args, fmt);

  r = color_vfprintf(fp, color, fmt, args, "\n");

  va_end(args);

  return r;

}

int color_is_nil(const char *c)

{

  return !strcmp(c, "NIL");

}