#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <stdlib.h>
#include <stdio.h>
#include <sys/sysinfo.h>
#include <sys/types.h>
#ifdef HAVE_INTTYPES_H
#include <inttypes.h>
#else
#include <stdint.h>
#endif
#include <stddef.h>   /* offsetof(3) */
#include <dirent.h>
#include <sys/stat.h> /* chmod(2)    */
#include <sys/file.h>
#include <sys/mman.h>
#include <fcntl.h>
#include <limits.h>
#include <string.h>   /* strdup(3)   */
#include <libgen.h>   /* basename(3) */
#include <ctype.h>    /* tolower(3)  */
#include <errno.h>
#include <time.h>
#include <sys/time.h>
#include <pwd.h>
#include <grp.h>
#include <stdarg.h>
#include <locale.h>
#include <unistd.h>

#include <git2.h>

#include <nls.h>

#include <defs.h>

#include <fatal.h>
#include <http.h>
#include <html.h>

#include <dlist.h>
#include <strbuf.h>
#include <repolist.h>
#include <wrapper.h>
#include <system.h>
#include <date.h>

#include <ctx.h>
#include <git-shared.h>
#include <ui-shared.h>


static void print_commit( struct strbuf *sb, git_commit *commit, const char *revision, const char *parent, int files, int insertions, int deletions )
{
  const git_oid       *oid;
  const char          *message;
  git_time_t           date;
  int                  offset;
  const git_signature *author;
  const git_signature *committer;

  char id[GIT_OID_HEXSZ+1] = { 0 };

  struct strbuf fbuf = STRBUF_INIT;
  struct strbuf ibuf = STRBUF_INIT;
  struct strbuf dbuf = STRBUF_INIT;

  struct strbuf atime = STRBUF_INIT;
  struct strbuf ctime = STRBUF_INIT;
  struct strbuf  cmsg = STRBUF_INIT;

  char *raw = NULL;

  if( !sb || !commit || !revision || !parent ) return;

  oid       = git_commit_id( commit );
  if( git_oid_fmt( (char *)&id[0], oid ) < 0 || strcmp( (char *)&id[0], revision ) ) return;

  message   = git_commit_summary( commit );
  author    = git_commit_author( commit );
  committer = git_commit_committer( commit );

  strbuf_addf( &cmsg, "%s", message );
  raw = strbuf_detach( &cmsg, NULL );
  strbuf_addstr_xml_quoted( &cmsg, (const char *)raw );
  free( raw );

  strbuf_addstr( sb, "              <div class=\"diff-cmsg\">\n" );
  strbuf_addstr( sb, "                <div class=\"cmsg-commit\">\n" );

  date   = author->when.time;
  offset = author->when.offset;
  offset = (offset % 60) + ((offset / 60) * 100);
  show_date( &atime, (time_t)date, offset, cgit_date_mode( DATE_ISO8601 ) );

  strbuf_addf( sb, "<span class=\"head\">   author:</span> %s &lt;%s&gt; %s\n", author->name, author->email, (char *)&atime.buf[0] );
  strbuf_release( &atime );

  date   = committer->when.time;
  offset = committer->when.offset;
  offset = (offset % 60) + ((offset / 60) * 100);
  show_date( &ctime, (time_t)date, offset, cgit_date_mode( DATE_ISO8601 ) );

  strbuf_addf( sb, "<span class=\"head\">committer:</span> %s &lt;%s&gt; %s\n", committer->name, committer->email, (char *)&ctime.buf[0] );
  strbuf_release( &ctime );

    strbuf_addf( sb, "<span class=\"head\">   commit:</span> <span class=\"revision\">%s</span>\n", revision );
    strbuf_addf( sb, "<span class=\"head\">   parent:</span> <span class=\"parent\">%s</span>\n", parent );
  strbuf_addstr( sb, "                </div>\n" );
  strbuf_addstr( sb, "                <div class=\"cmsg-summary\">\n" );
  strbuf_addstr( sb, "                  <div class=\"head\">\n" );
  strbuf_addstr( sb, "                    Commit Summary:\n" );
  strbuf_addstr( sb, "                  </div>\n" );
    strbuf_addf( sb, "                  <div class=\"message\">%s</div>\n", (char *)&cmsg.buf[0] );
  strbuf_release( &cmsg );
  strbuf_addstr( sb, "                </div>\n" );
  strbuf_addstr( sb, "              </div>\n" );

  strbuf_addf( &fbuf, Q_("%d file changed", "%d files changed", files), files );
  strbuf_addf( &ibuf, Q_("%d insertion", "%d insertions", insertions), insertions );
  strbuf_addf( &dbuf, Q_("%d deletion", "%d deletions", deletions), deletions );

  strbuf_addstr( sb, "              <div class=\"diff-stat\">\n" );
  strbuf_addstr( sb, "                <div class=\"head\">Diffstat:</div>\n" );
    strbuf_addf( sb, "                <div class=\"line\">%s, %s, %s</div>\n", (char *)&fbuf.buf[0], (char *)&ibuf.buf[0], (char *)&dbuf.buf[0] );
  strbuf_addstr( sb, "              </div>\n" );

  strbuf_release( &fbuf );
  strbuf_release( &ibuf );
  strbuf_release( &dbuf );
}

static void cgit_print_diff( struct strbuf *sb, const char *relative_path, const char *revision )
{
  struct strbuf buf   = STRBUF_INIT;

  git_commit *commit = NULL;
  char parent_hex[GIT_OID_HEXSZ+1] = { 0 };
  int files, insertions, deletions;
  char *raw = NULL;

  if( !sb ) return;

  commit = lookup_commit_by_hex( revision );

  cgit_diff_with_parent( &buf, (char *)&parent_hex[0], GIT_OID_HEXSZ+1, &files, &insertions, &deletions, revision, ( relative_path && *relative_path ) ? relative_path : "/" );

  print_commit( sb, commit, revision, (const char *)&parent_hex[0], files, insertions, deletions );
  git_commit_free( commit );

  strbuf_addf( sb, "<pre><code class='language-Diff'>" );

  raw = strbuf_detach( &buf, NULL );
  strbuf_addstr_xml_quoted( &buf, (const char *)raw );
  free( raw );

  strbuf_addbuf( sb, (const struct strbuf *)&buf );
  strbuf_release( &buf );

  strbuf_addstr( sb, "\n</code></pre>\n" );
}

void cgit_print_diff_page( void )
{
  FILE  *fp;
  struct strbuf buf = STRBUF_INIT;

  fp = xfopen( ctx.page.header, "r" );
  (void)strbuf_env_fread( &buf, fp );
  fclose( fp );

  strbuf_addf( &buf, "        <div class=\"content segment\">\n" );
  strbuf_addf( &buf, "          <div class=\"container\">\n" );
  strbuf_addf( &buf, "            <div class=\"cgit-main-content\">\n" );

  if( ctx.repo.name )
  {
    cgit_print_diff( &buf, ctx.repo.relative_path, (!strcmp( ctx.query.rev, "0" )) ? (const char *)&ctx.repo.relative_info.revision[0] : ctx.query.rev );
  }
  else
  {
    strbuf_addf( &buf, "              <h1>Requested resource cannot be shown</h1>\n" );
    strbuf_addf( &buf, "              <p class='leading'>Repository '%s' not found.</p>\n", ctx.repo.name );
  }

  strbuf_addf( &buf, "            </div> <!-- End of cgit-main-content -->\n" );
  strbuf_addf( &buf, "          </div> <!-- End of container -->\n" );
  strbuf_addf( &buf, "        </div> <!-- End of content segment -->\n" );

  fp = xfopen( ctx.page.footer, "r" );
  (void)strbuf_env_fread( &buf, fp );
  fclose( fp );

  ctx.page.size = buf.len;
  cgit_print_http_headers();
  strbuf_write( &buf, STDOUT_FILENO );
  strbuf_release( &buf );
}