/*
 * list-cmd.c -- list a URL
 *
 * ====================================================================
 *    Licensed to the Apache Software Foundation (ASF) under one
 *    or more contributor license agreements.  See the NOTICE file
 *    distributed with this work for additional information
 *    regarding copyright ownership.  The ASF licenses this file
 *    to you under the Apache License, Version 2.0 (the
 *    "License"); you may not use this file except in compliance
 *    with the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *    Unless required by applicable law or agreed to in writing,
 *    software distributed under the License is distributed on an
 *    "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 *    KIND, either express or implied.  See the License for the
 *    specific language governing permissions and limitations
 *    under the License.
 * ====================================================================
 */

#include "svn_cmdline.h"
#include "svn_client.h"
#include "svn_error.h"
#include "svn_pools.h"
#include "svn_time.h"
#include "svn_xml.h"
#include "svn_dirent_uri.h"
#include "svn_path.h"
#include "svn_utf.h"
#include "svn_opt.h"

#include "cl.h"

#include "svn_private_config.h"


/* Baton used when printing directory entries. */
struct print_baton {
  svn_client_ctx_t *ctx;
  svn_boolean_t verbose;
  svn_cl__size_unit_t file_size_unit;

  /* Keep track of the width of the author field. */
  int author_width;
  int max_author_width;

  /* To keep track of last seen external information. */
  const char *last_external_parent_url;
  const char *last_external_target;
  svn_boolean_t in_external;
};

/* Starting and maximum width of the author field */
static const int initial_author_width = 8;
static const int initial_human_readable_author_width = 14;
static const int maximum_author_width = 16;
static const int maximum_human_readable_author_width = 22;

/* Width of the size field */
static const int normal_size_width = 10;
static const int human_readable_size_width = 4;

/* Field flags required for this function */
static const apr_uint32_t print_dirent_fields = SVN_DIRENT_KIND;
static const apr_uint32_t print_dirent_fields_verbose = (
    SVN_DIRENT_KIND  | SVN_DIRENT_SIZE | SVN_DIRENT_TIME |
    SVN_DIRENT_CREATED_REV | SVN_DIRENT_LAST_AUTHOR);


/* This implements the svn_client_list_func2_t API, printing a single
   directory entry in text format. */
static svn_error_t *
print_dirent(void *baton,
             const char *path,
             const svn_dirent_t *dirent,
             const svn_lock_t *lock,
             const char *abs_path,
             const char *external_parent_url,
             const char *external_target,
             apr_pool_t *scratch_pool)
{
  struct print_baton *pb = baton;
  const char *entryname;
  static const char *time_format_long = NULL;
  static const char *time_format_short = NULL;

  SVN_ERR_ASSERT((external_parent_url == NULL && external_target == NULL) ||
                 (external_parent_url && external_target));

  if (time_format_long == NULL)
    time_format_long = _("%b %d %H:%M");
  if (time_format_short == NULL)
    time_format_short = _("%b %d  %Y");

  if (pb->ctx->cancel_func)
    SVN_ERR(pb->ctx->cancel_func(pb->ctx->cancel_baton));

  if (strcmp(path, "") == 0)
    {
      if (dirent->kind == svn_node_file)
        entryname = svn_dirent_basename(abs_path, scratch_pool);
      else if (pb->verbose)
        entryname = ".";
      else
        /* Don't bother to list if no useful information will be shown. */
        return SVN_NO_ERROR;
    }
  else
    entryname = path;

  if (external_parent_url && external_target)
    {
      if ((pb->last_external_parent_url == NULL
           && pb->last_external_target == NULL)
          || (strcmp(pb->last_external_parent_url, external_parent_url) != 0
              || strcmp(pb->last_external_target, external_target) != 0))
        {
          SVN_ERR(svn_cmdline_printf(scratch_pool,
                                     _("Listing external '%s'"
                                       " defined on '%s':\n"),
                                     external_target,
                                     external_parent_url));

          pb->last_external_parent_url = external_parent_url;
          pb->last_external_target = external_target;
        }
    }

  if (pb->verbose)
    {
      apr_time_t now = apr_time_now();
      apr_time_exp_t exp_time;
      apr_status_t apr_err;
      apr_size_t size;
      char timestr[20];
      const int sizewidth = (pb->file_size_unit == SVN_CL__SIZE_UNIT_NONE
                             ? normal_size_width
                             : human_readable_size_width);
      const char *sizestr = "";
      const char *utf8_timestr;

      /* svn_time_to_human_cstring gives us something *way* too long
         to use for this, so we have to roll our own.  We include
         the year if the entry's time is not within half a year. */
      apr_time_exp_lt(&exp_time, dirent->time);
      if (apr_time_sec(now - dirent->time) < (365 * 86400 / 2)
          && apr_time_sec(dirent->time - now) < (365 * 86400 / 2))
        {
          apr_err = apr_strftime(timestr, &size, sizeof(timestr),
                                 time_format_long, &exp_time);
        }
      else
        {
          apr_err = apr_strftime(timestr, &size, sizeof(timestr),
                                 time_format_short, &exp_time);
        }

      /* if that failed, just zero out the string and print nothing */
      if (apr_err)
        timestr[0] = '\0';

      /* we need it in UTF-8. */
      SVN_ERR(svn_utf_cstring_to_utf8(&utf8_timestr, timestr, scratch_pool));

      /* We may have to adjust the width of th 'author' field. */
      if (dirent->last_author)
        {
          const int author_width = (int)strlen(dirent->last_author);
          if (author_width > pb->author_width)
            {
              if (author_width < pb->max_author_width)
                pb->author_width = author_width;
              else
                pb->author_width = pb->max_author_width;
            }
        }

      if (dirent->kind == svn_node_file)
        {
          SVN_ERR(svn_cl__format_file_size(&sizestr, dirent->size,
                                           pb->file_size_unit,
                                           FALSE, scratch_pool));
        }

      return svn_cmdline_printf
              (scratch_pool, "%7ld %-*.*s %c %*s %12s %s%s\n",
               dirent->created_rev,
               pb->author_width, pb->author_width,
               dirent->last_author ? dirent->last_author : " ? ",
               lock ? 'O' : ' ',
               sizewidth, sizestr,
               utf8_timestr,
               entryname,
               (dirent->kind == svn_node_dir) ? "/" : "");
    }
  else
    {
      return svn_cmdline_printf(scratch_pool, "%s%s\n", entryname,
                                (dirent->kind == svn_node_dir)
                                ? "/" : "");
    }
}

/* Field flags required for this function */
static const apr_uint32_t print_dirent_xml_fields = (
    SVN_DIRENT_KIND  | SVN_DIRENT_SIZE | SVN_DIRENT_TIME |
    SVN_DIRENT_CREATED_REV | SVN_DIRENT_LAST_AUTHOR);
/* This implements the svn_client_list_func2_t API, printing a single dirent
   in XML format. */
static svn_error_t *
print_dirent_xml(void *baton,
                 const char *path,
                 const svn_dirent_t *dirent,
                 const svn_lock_t *lock,
                 const char *abs_path,
                 const char *external_parent_url,
                 const char *external_target,
                 apr_pool_t *scratch_pool)
{
  struct print_baton *pb = baton;
  const char *entryname;
  svn_stringbuf_t *sb = svn_stringbuf_create_empty(scratch_pool);

  SVN_ERR_ASSERT((external_parent_url == NULL && external_target == NULL) ||
                 (external_parent_url && external_target));

  if (strcmp(path, "") == 0)
    {
      if (dirent->kind == svn_node_file)
        entryname = svn_dirent_basename(abs_path, scratch_pool);
      else
        /* Don't bother to list if no useful information will be shown. */
        return SVN_NO_ERROR;
    }
  else
    entryname = path;

  if (pb->ctx->cancel_func)
    SVN_ERR(pb->ctx->cancel_func(pb->ctx->cancel_baton));

  if (external_parent_url && external_target)
    {
      if ((pb->last_external_parent_url == NULL
           && pb->last_external_target == NULL)
          || (strcmp(pb->last_external_parent_url, external_parent_url) != 0
              || strcmp(pb->last_external_target, external_target) != 0))
        {
          if (pb->in_external)
            {
              /* The external item being listed is different from the previous
                 one, so close the tag. */
              svn_xml_make_close_tag(&sb, scratch_pool, "external");
              pb->in_external = FALSE;
            }

          svn_xml_make_open_tag(&sb, scratch_pool, svn_xml_normal, "external",
                                "parent_url", external_parent_url,
                                "target", external_target,
                                SVN_VA_NULL);

          pb->last_external_parent_url = external_parent_url;
          pb->last_external_target = external_target;
          pb->in_external = TRUE;
        }
    }

  svn_xml_make_open_tag(&sb, scratch_pool, svn_xml_normal, "entry",
                        "kind", svn_cl__node_kind_str_xml(dirent->kind),
                        SVN_VA_NULL);

  svn_cl__xml_tagged_cdata(&sb, scratch_pool, "name", entryname);

  if (dirent->kind == svn_node_file)
    {
      const char *sizestr;
      SVN_ERR(svn_cl__format_file_size(&sizestr, dirent->size,
                                       SVN_CL__SIZE_UNIT_XML,
                                       FALSE, scratch_pool));
      svn_cl__xml_tagged_cdata(&sb, scratch_pool, "size", sizestr);
    }

  svn_xml_make_open_tag(&sb, scratch_pool, svn_xml_normal, "commit",
                        "revision",
                        apr_psprintf(scratch_pool, "%ld", dirent->created_rev),
                        SVN_VA_NULL);
  svn_cl__xml_tagged_cdata(&sb, scratch_pool, "author", dirent->last_author);
  if (dirent->time)
    svn_cl__xml_tagged_cdata(&sb, scratch_pool, "date",
                             svn_time_to_cstring(dirent->time, scratch_pool));
  svn_xml_make_close_tag(&sb, scratch_pool, "commit");

  if (lock)
    {
      svn_xml_make_open_tag(&sb, scratch_pool, svn_xml_normal, "lock",
                            SVN_VA_NULL);
      svn_cl__xml_tagged_cdata(&sb, scratch_pool, "token", lock->token);
      svn_cl__xml_tagged_cdata(&sb, scratch_pool, "owner", lock->owner);
      svn_cl__xml_tagged_cdata(&sb, scratch_pool, "comment", lock->comment);
      svn_cl__xml_tagged_cdata(&sb, scratch_pool, "created",
                               svn_time_to_cstring(lock->creation_date,
                                                   scratch_pool));
      if (lock->expiration_date != 0)
        svn_cl__xml_tagged_cdata(&sb, scratch_pool, "expires",
                                 svn_time_to_cstring
                                 (lock->expiration_date, scratch_pool));
      svn_xml_make_close_tag(&sb, scratch_pool, "lock");
    }

  svn_xml_make_close_tag(&sb, scratch_pool, "entry");

  return svn_cl__error_checked_fputs(sb->data, stdout);
}


/* This implements the `svn_opt_subcommand_t' interface. */
svn_error_t *
svn_cl__list(apr_getopt_t *os,
             void *baton,
             apr_pool_t *pool)
{
  svn_cl__opt_state_t *opt_state = ((svn_cl__cmd_baton_t *) baton)->opt_state;
  svn_client_ctx_t *ctx = ((svn_cl__cmd_baton_t *) baton)->ctx;
  apr_array_header_t *targets;
  int i;
  apr_pool_t *subpool = svn_pool_create(pool);
  apr_uint32_t dirent_fields;
  struct print_baton pb;
  svn_boolean_t seen_nonexistent_target = FALSE;
  svn_error_t *err;
  svn_error_t *externals_err = SVN_NO_ERROR;
  struct svn_cl__check_externals_failed_notify_baton nwb;

  SVN_ERR(svn_cl__args_to_target_array_print_reserved(&targets, os,
                                                      opt_state->targets,
                                                      ctx, FALSE, pool));

  /* Add "." if user passed 0 arguments */
  svn_opt_push_implicit_dot_target(targets, pool);

  if (opt_state->xml)
    {
      /* The XML output contains all the information, so "--verbose" does
         not apply, and using "--human-readable" with machine-readable
         output does not make sense. */
      if (opt_state->verbose)
        return svn_error_create(
            SVN_ERR_CL_ARG_PARSING_ERROR, NULL,
            _("--verbose is not valid in --xml mode"));
      if (opt_state->file_size_unit != SVN_CL__SIZE_UNIT_NONE)
        return svn_error_create(
            SVN_ERR_CL_ARG_PARSING_ERROR, NULL,
            _("--human-readable is not valid in --xml mode"));

      /* If output is not incremental, output the XML header and wrap
         everything in a top-level element. This makes the output in
         its entirety a well-formed XML document. */
      if (! opt_state->incremental)
        SVN_ERR(svn_cl__xml_print_header("lists", pool));
    }
  else
    {
      if (opt_state->incremental)
        return svn_error_create(
            SVN_ERR_CL_ARG_PARSING_ERROR, NULL,
            _("--incremental is only valid in --xml mode"));
    }

  if (opt_state->xml)
    dirent_fields = print_dirent_xml_fields;
  else if (opt_state->verbose)
    dirent_fields = print_dirent_fields_verbose;
  else
    dirent_fields = print_dirent_fields;

  pb.ctx = ctx;
  pb.verbose = opt_state->verbose;
  pb.file_size_unit = opt_state->file_size_unit;
  if (pb.file_size_unit == SVN_CL__SIZE_UNIT_NONE)
    {
      pb.author_width = initial_author_width;
      pb.max_author_width = maximum_author_width;
    }
  else
    {
      pb.author_width = initial_human_readable_author_width;
      pb.max_author_width = maximum_human_readable_author_width;
    }

  if (opt_state->depth == svn_depth_unknown)
    opt_state->depth = svn_depth_immediates;

  if (opt_state->include_externals)
    {
      nwb.wrapped_func = ctx->notify_func2;
      nwb.wrapped_baton = ctx->notify_baton2;
      nwb.had_externals_error = FALSE;
      ctx->notify_func2 = svn_cl__check_externals_failed_notify_wrapper;
      ctx->notify_baton2 = &nwb;
    }

  /* For each target, try to list it. */
  for (i = 0; i < targets->nelts; i++)
    {
      const char *target = APR_ARRAY_IDX(targets, i, const char *);
      const char *truepath;
      svn_opt_revision_t peg_revision;
      apr_array_header_t *patterns = NULL;
      int k;

      /* Initialize the following variables for
         every list target. */
      pb.last_external_parent_url = NULL;
      pb.last_external_target = NULL;
      pb.in_external = FALSE;

      svn_pool_clear(subpool);

      SVN_ERR(svn_cl__check_cancel(ctx->cancel_baton));

      /* Get peg revisions. */
      SVN_ERR(svn_opt_parse_path(&peg_revision, &truepath, target,
                                 subpool));

      if (opt_state->xml)
        {
          svn_stringbuf_t *sb = svn_stringbuf_create_empty(pool);
          svn_xml_make_open_tag(&sb, pool, svn_xml_normal, "list",
                                "path", truepath[0] == '\0' ? "." : truepath,
                                SVN_VA_NULL);
          SVN_ERR(svn_cl__error_checked_fputs(sb->data, stdout));
        }

      if (opt_state->search_patterns)
        {
          patterns = apr_array_make(subpool, 4, sizeof(const char *));
          for (k = 0; k < opt_state->search_patterns->nelts; ++k)
            {
              apr_array_header_t *pattern_group
                = APR_ARRAY_IDX(opt_state->search_patterns, k,
                                apr_array_header_t *);
              const char *pattern;

              /* Should never fail but ... */
              if (pattern_group->nelts != 1)
                return svn_error_create(SVN_ERR_CL_ARG_PARSING_ERROR, NULL,
                                  _("'search-and' option is not supported"));

              pattern = APR_ARRAY_IDX(pattern_group, 0, const char *);
#if defined(WIN32)
              /* As we currently can't pass glob patterns via the Windows
                 CLI, fall back to sub-string search. */
              pattern = apr_psprintf(subpool, "*%s*", pattern);
#endif
              APR_ARRAY_PUSH(patterns, const char *) = pattern;
            }
        }

      err = svn_client_list4(truepath, &peg_revision,
                             &(opt_state->start_revision), patterns,
                             opt_state->depth,
                             dirent_fields,
                             (opt_state->xml || opt_state->verbose),
                             opt_state->include_externals,
                             opt_state->xml ? print_dirent_xml : print_dirent,
                             &pb, ctx, subpool);

      if (err)
        {
          /* If one of the targets is a non-existent URL or wc-entry,
             don't bail out.  Just warn and move on to the next target. */
          if (err->apr_err == SVN_ERR_WC_PATH_NOT_FOUND ||
              err->apr_err == SVN_ERR_FS_NOT_FOUND)
              svn_handle_warning2(stderr, err, "svn: ");
          else
              return svn_error_trace(err);

          svn_error_clear(err);
          err = NULL;
          seen_nonexistent_target = TRUE;
        }

      if (opt_state->xml)
        {
          svn_stringbuf_t *sb = svn_stringbuf_create_empty(pool);

          if (pb.in_external)
            {
              /* close the final external item's tag */
              svn_xml_make_close_tag(&sb, pool, "external");
              pb.in_external = FALSE;
            }

          svn_xml_make_close_tag(&sb, pool, "list");
          SVN_ERR(svn_cl__error_checked_fputs(sb->data, stdout));
        }
    }

  svn_pool_destroy(subpool);

  if (opt_state->include_externals && nwb.had_externals_error)
    {
      externals_err = svn_error_create(SVN_ERR_CL_ERROR_PROCESSING_EXTERNALS,
                                       NULL,
                                       _("Failure occurred processing one or "
                                         "more externals definitions"));
    }

  if (opt_state->xml && ! opt_state->incremental)
    SVN_ERR(svn_cl__xml_print_footer("lists", pool));

  if (seen_nonexistent_target)
    err = svn_error_create(SVN_ERR_ILLEGAL_TARGET, NULL,
          _("Could not list all targets because some targets don't exist"));
  else
    err = NULL;

  return svn_error_compose_create(externals_err, err);
}