#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 <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 <ui-shared.h>


static void csvn_print_diff( struct strbuf *sb, const char *relative_path, int revision )
{
  const char *co_prefix = ctx.repo.checkout_ro_prefix;
  const char *name      = ctx.repo.name;
  const char *repo_root = ctx.repo.repo_root;

  if( !sb || !relative_path || !revision ) return;

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

  if( co_prefix )
  {
    char repo_path[PATH_MAX] = { 0 };
    char cmd[PATH_MAX];
    struct strbuf buf = STRBUF_INIT;
    char  *raw = NULL;
    pid_t  p = (pid_t) -1;
    int    rc;

    if( repo_root && *repo_root )
    {
      strcat( (char *)&repo_path[0], repo_root );
      strcat( (char *)&repo_path[0], "/" );
    }
    strcat( (char *)&repo_path[0], name );

    snprintf( (char *)&cmd[0], 1024,
              "svn diff --revision %d:%d %s/%s/%s 2>/dev/null",
              revision-1, revision, co_prefix, (char *)&repo_path[0], relative_path );
    p = sys_exec_command( &buf, cmd );
    rc = sys_wait_command( p, NULL );
    if( rc != 0 )
    {
      strbuf_release( &buf );
      return;
    }

    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" );

  return;
}

void csvn_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=\"csvn-main-content\">\n" );

  if( ctx.repo.name )
  {
    if( ctx.query.rev )
    {
      csvn_print_diff( &buf, ctx.repo.relative_path, ctx.query.rev );
    }
    else
    {
      strbuf_addf( &buf, "              <h1>Requested diff cannot be shown</h1>\n" );
      strbuf_addf( &buf, "              <p class='leading'>Revision for diff operation is not defined.</p>\n" );
    }
  }
  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 csvn-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;
  csvn_print_http_headers();
  strbuf_write( &buf, STDOUT_FILENO );
  strbuf_release( &buf );
}