/*
 * switch-cmd.c -- Bring work tree in sync with a different URL
 *
 * ====================================================================
 * Copyright (c) 2000-2004 CollabNet.  All rights reserved.
 *
 * This software is licensed as described in the file COPYING, which
 * you should have received as part of this distribution.  The terms
 * are also available at http://subversion.tigris.org/license-1.html.
 * If newer versions of this license are posted there, you may use a
 * newer version instead, at your option.
 *
 * This software consists of voluntary contributions made by many
 * individuals.  For exact contribution history, see the revision
 * history and logs, available at http://subversion.tigris.org/.
 * ====================================================================
 */

/* ==================================================================== */



/*** Includes. ***/

#include "svn_wc.h"
#include "svn_client.h"
#include "svn_path.h"
#include "svn_error.h"
#include "svn_pools.h"
#include "cl.h"

#include "svn_private_config.h"

/*** Code. ***/

static svn_error_t *
rewrite_urls(apr_array_header_t *targets,
             svn_boolean_t recurse,
             svn_client_ctx_t *ctx,
             apr_pool_t *pool)
{
  apr_pool_t *subpool;
  const char *from;
  const char *to;
  int i;
 
  if (targets->nelts < 2)
    return svn_error_create(SVN_ERR_CL_INSUFFICIENT_ARGS, 0, NULL);

  from = ((const char **) (targets->elts))[0];
  to = ((const char **) (targets->elts))[1];

  /* "--relocate http https" and "--relocate http://foo svn://bar" are OK,
     but things like "--relocate http://foo svn" are not */
  if (svn_path_is_url(from) != svn_path_is_url(to))
    return svn_error_createf 
      (SVN_ERR_INCORRECT_PARAMS, NULL, 
       _("'%s' to '%s' is not a valid relocation"), from, to);
 
  subpool = svn_pool_create(pool);

  if (targets->nelts == 2)
    {
      SVN_ERR(svn_client_relocate("", from, to, recurse, ctx, pool));
    }
  else
    {
      for (i = 2; i < targets->nelts; i++)
        {
          const char *target = ((const char **) (targets->elts))[i];
          svn_pool_clear(subpool);
          SVN_ERR(svn_client_relocate(target, from, to, recurse, 
                                      ctx, subpool));
        }
    }

  svn_pool_destroy(subpool);
  return SVN_NO_ERROR;
}


/* This implements the `svn_opt_subcommand_t' interface. */
svn_error_t *
svn_cl__switch(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;
  const char *target = NULL, *switch_url = NULL;
  svn_wc_adm_access_t *adm_access;
  const svn_wc_entry_t *entry;
  const char *parent_dir, *base_tgt;

  /* This command should discover (or derive) exactly two cmdline
     arguments: a local path to update ("target"), and a new url to
     switch to ("switch_url"). */
  SVN_ERR(svn_opt_args_to_target_array2(&targets, os, 
                                        opt_state->targets, pool));

  /* handle only-rewrite case specially */
  if (opt_state->relocate)
    return rewrite_urls(targets, !opt_state->nonrecursive, ctx, pool);

  if (targets->nelts < 1)
    return svn_error_create(SVN_ERR_CL_INSUFFICIENT_ARGS, 0, NULL);
  if (targets->nelts > 2)
    return svn_error_create(SVN_ERR_CL_ARG_PARSING_ERROR, 0, NULL);

  /* Get the required SWITCH_URL and the optional TARGET arguments. */
  if (targets->nelts == 1)
    {
      switch_url = ((const char **) (targets->elts))[0];
      target = "";
    }
  else
    {
      switch_url = ((const char **) (targets->elts))[0];
      target = ((const char **) (targets->elts))[1];
    }

  /* Validate the switch_url */
  if (! svn_path_is_url(switch_url))
    return svn_error_createf 
      (SVN_ERR_BAD_URL, NULL, 
       _("'%s' does not appear to be a URL"), switch_url);

  /* Canonicalize the URL. */
  switch_url = svn_path_canonicalize(switch_url, pool);

  /* Validate the target */
  SVN_ERR(svn_wc_adm_probe_open3(&adm_access, NULL, target, FALSE, 0,
                                 ctx->cancel_func, ctx->cancel_baton,
                                 pool));
  SVN_ERR(svn_wc_entry(&entry, target, adm_access, FALSE, pool));
  if (! entry)
    return svn_error_createf 
      (SVN_ERR_ENTRY_NOT_FOUND, NULL, 
       _("'%s' does not appear to be a working copy path"), target);
  
  /* We want the switch to print the same letters as a regular update. */
  if (entry->kind == svn_node_file)
    SVN_ERR(svn_wc_get_actual_target(target, &parent_dir, &base_tgt, pool));
  else if (entry->kind == svn_node_dir)
    parent_dir = target;

  if (! opt_state->quiet)
    svn_cl__get_notifier(&ctx->notify_func2, &ctx->notify_baton2, FALSE,
                         FALSE, FALSE, pool);

  /* Do the 'switch' update. */
  SVN_ERR(svn_client_switch(NULL, target, switch_url,
                            &(opt_state->start_revision),
                            opt_state->nonrecursive ? FALSE : TRUE,
                            ctx, pool));

  return SVN_NO_ERROR;
}