#ifdef FOSSIL_ENABLE_JSON
/*
** Copyright (c) 2011 D. Richard Hipp
**
** This program is free software; you can redistribute it and/or
** modify it under the terms of the Simplified BSD License (also
** known as the "2-Clause License" or "FreeBSD License".)
**
** This program is distributed in the hope that it will be useful,
** but without any warranty; without even the implied warranty of
** merchantability or fitness for a particular purpose.
**
** Author contact information:
**   drh@hwaci.com
**   http://www.hwaci.com/drh/
**
*/
#include "VERSION.h"
#include "config.h"
#include "json_dir.h"

#if INTERFACE
#include "json_detail.h"
#endif

static cson_value * json_page_dir_list();
/*
** Mapping of /json/wiki/XXX commands/paths to callbacks.
*/
static const JsonPageDef JsonPageDefs_Dir[] = {
/* Last entry MUST have a NULL name. */
{NULL,NULL,0}
};

#if 0 /* TODO: Not used? */
static char const * json_dir_path_extra(){
  static char const * zP = NULL;
  if( !zP ){
    zP = g.zExtra;
    while(zP && *zP && ('/'==*zP)){
      ++zP;
    }
  }
  return zP;
}
#endif

/*
** Impl of /json/dir. 98% of it was taken directly
** from browse.c::page_dir()
*/
static cson_value * json_page_dir_list(){
  cson_object * zPayload = NULL; /* return value */
  cson_array * zEntries = NULL; /* accumulated list of entries. */
  cson_object * zEntry = NULL;  /* a single dir/file entry. */
  cson_array * keyStore = NULL; /* garbage collector for shared strings. */
  cson_string * zKeyName = NULL;
  cson_string * zKeySize = NULL;
  cson_string * zKeyIsDir = NULL;
  cson_string * zKeyUuid = NULL;
  cson_string * zKeyTime = NULL;
  cson_string * zKeyRaw = NULL;
  char * zD = NULL;
  char const * zDX = NULL;
  int nD;
  char * zUuid = NULL;
  char const * zCI = NULL;
  Manifest * pM = NULL;
  Stmt q = empty_Stmt;
  int rid = 0;
  if( !g.perm.Read ){
    json_set_err(FSL_JSON_E_DENIED, "Requires 'o' permissions.");
    return NULL;
  }
  zCI = json_find_option_cstr("checkin",NULL,"ci" );

  /* If a specific check-in is requested, fetch and parse it.  If the
  ** specific check-in does not exist, clear zCI.  zCI==0 will cause all
  ** files from all check-ins to be displayed.
  */
  if( zCI && *zCI ){
    pM = manifest_get_by_name(zCI, &rid);
    if( pM ){
      zUuid = db_text(0, "SELECT uuid FROM blob WHERE rid=%d", rid);
    }else{
      json_set_err(FSL_JSON_E_UNRESOLVED_UUID,
                   "Checkin name [%s] is unresolved.",
                   zCI);
      return NULL;
    }
  }

  /* Jump through some hoops to find the directory name... */
  zDX = json_find_option_cstr("name",NULL,NULL);
  if(!zDX && !g.isHTTP){
    zDX = json_command_arg(g.json.dispatchDepth+1);
  }
  if(zDX && (!*zDX || (0==strcmp(zDX,"/")))){
    zDX = NULL;
  }
  zD = zDX ? fossil_strdup(zDX) : NULL;
  nD = zD ? strlen(zD)+1 : 0;
  while( nD>1 && zD[nD-2]=='/' ){ zD[(--nD)-1] = 0; }

  sqlite3_create_function(g.db, "pathelement", 2, SQLITE_UTF8, 0,
                          pathelementFunc, 0, 0);

  /* Compute the temporary table "localfiles" containing the names
  ** of all files and subdirectories in the zD[] directory.
  **
  ** Subdirectory names begin with "/".  This causes them to sort
  ** first and it also gives us an easy way to distinguish files
  ** from directories in the loop that follows.
  */

  if( zCI ){
    Stmt ins;
    ManifestFile *pFile;
    ManifestFile *pPrev = 0;
    int nPrev = 0;
    int c;

    db_multi_exec(
                  "CREATE TEMP TABLE json_dir_files("
                  "  n UNIQUE NOT NULL," /* file name */
                  "  fn UNIQUE NOT NULL," /* full file name */
                  "  u DEFAULT NULL," /* file uuid */
                  "  sz DEFAULT -1," /* file size */
                  "  mtime DEFAULT NULL" /* file mtime in unix epoch format */
                  ");"
                  );

    db_prepare(&ins,
               "INSERT OR IGNORE INTO json_dir_files (n,fn,u,sz,mtime) "
               "SELECT"
               "  pathelement(:path,0),"
               "  CASE WHEN %Q IS NULL THEN '' ELSE %Q||'/' END ||:abspath,"
               "  a.uuid,"
               "  a.size,"
               "  CAST(strftime('%%s',e.mtime) AS INTEGER) "
               "FROM"
               "  mlink m, "
               "  event e,"
               "  blob a,"
               "  blob b "
               "WHERE"
               " e.objid=m.mid"
               " AND a.rid=m.fid"/*FILE artifact*/
               " AND b.rid=m.mid"/*CHECKIN artifact*/
               " AND a.uuid=:uuid",
               zD, zD
               );
    manifest_file_rewind(pM);
    while( (pFile = manifest_file_next(pM,0))!=0 ){
      if( nD>0
        && ((pFile->zName[nD-1]!='/') || (0!=memcmp(pFile->zName, zD, nD-1)))
      ){
        continue;
      }
      /*printf("zD=%s, nD=%d, pFile->zName=%s\n", zD, nD, pFile->zName);*/
      if( pPrev
       && memcmp(&pFile->zName[nD],&pPrev->zName[nD],nPrev)==0
       && (pFile->zName[nD+nPrev]==0 || pFile->zName[nD+nPrev]=='/')
      ){
        continue;
      }
      db_bind_text( &ins, ":path", &pFile->zName[nD] );
      db_bind_text( &ins, ":abspath", &pFile->zName[nD] );
      db_bind_text( &ins, ":uuid", pFile->zUuid );
      db_step(&ins);
      db_reset(&ins);
      pPrev = pFile;
      for(nPrev=0; (c=pPrev->zName[nD+nPrev]) && c!='/'; nPrev++){}
      if( c=='/' ) nPrev++;
    }
    db_finalize(&ins);
  }else if( zD && *zD ){
    db_multi_exec(
      "CREATE TEMP VIEW json_dir_files AS"
      " SELECT DISTINCT(pathelement(name,%d)) AS n,"
      " %Q||'/'||name AS fn,"
      " NULL AS u, NULL AS sz, NULL AS mtime"
      " FROM filename"
      "  WHERE name GLOB '%q/*'"
      " GROUP BY n",
      nD, zD, zD
    );
  }else{
    db_multi_exec(
      "CREATE TEMP VIEW json_dir_files"
      " AS SELECT DISTINCT(pathelement(name,0)) AS n, NULL AS fn"
      " FROM filename"
    );
  }

  if(zCI){
    db_prepare( &q, "SELECT"
                "  n as name,"
                "  fn as fullname,"
                "  u as uuid,"
                "  sz as size,"
                "  mtime as mtime "
                "FROM json_dir_files ORDER BY n");
  }else{/* UUIDs are all NULL. */
    db_prepare( &q, "SELECT n, fn FROM json_dir_files ORDER BY n");
  }

  zKeyName = cson_new_string("name",4);
  zKeyUuid = cson_new_string("uuid",4);
  zKeyIsDir = cson_new_string("isDir",5);
  keyStore = cson_new_array();
  cson_array_append( keyStore, cson_string_value(zKeyName) );
  cson_array_append( keyStore, cson_string_value(zKeyUuid) );
  cson_array_append( keyStore, cson_string_value(zKeyIsDir) );

  if( zCI ){
    zKeySize = cson_new_string("size",4);
    cson_array_append( keyStore, cson_string_value(zKeySize) );
    zKeyTime = cson_new_string("timestamp",9);
    cson_array_append( keyStore, cson_string_value(zKeyTime) );
    zKeyRaw = cson_new_string("downloadPath",12);
    cson_array_append( keyStore, cson_string_value(zKeyRaw) );
  }
  zPayload = cson_new_object();
  cson_object_set_s( zPayload, zKeyName,
                     json_new_string((zD&&*zD) ? zD : "/") );
  if( zUuid ){
    cson_object_set( zPayload, "checkin", json_new_string(zUuid) );
  }

  while( (SQLITE_ROW==db_step(&q)) ){
    cson_value * name = NULL;
    char const * n = db_column_text(&q,0);
    char const isDir = ('/'==*n);
    zEntry = cson_new_object();
    if(!zEntries){
      zEntries = cson_new_array();
      cson_object_set( zPayload, "entries", cson_array_value(zEntries) );
    }
    cson_array_append(zEntries, cson_object_value(zEntry) );
    if(isDir){
      name = json_new_string( n+1 );
      cson_object_set_s(zEntry, zKeyIsDir, cson_value_true() );
    } else{
      name = json_new_string( n );
    }
    cson_object_set_s(zEntry, zKeyName, name );
    if( zCI && !isDir){
      /* Don't add the uuid/size for dir entries - that data refers to
         one of the files in that directory :/. Entries with no
         --checkin may refer to N versions, and therefore we cannot
         associate a single size and uuid with them (and fetching all
         would be overkill for most use cases).
      */
      char const * fullName = db_column_text(&q,1);
      char const * u = db_column_text(&q,2);
      sqlite_int64 const sz = db_column_int64(&q,3);
      sqlite_int64 const ts = db_column_int64(&q,4);
      cson_object_set_s(zEntry, zKeyUuid, json_new_string( u ) );
      cson_object_set_s(zEntry, zKeySize,
                        cson_value_new_integer( (cson_int_t)sz ));
      cson_object_set_s(zEntry, zKeyTime,
          cson_value_new_integer( (cson_int_t)ts ));
      cson_object_set_s(zEntry, zKeyRaw,
                        json_new_string_f("/raw/%T?name=%t",
                                          fullName, u));
    }
  }
  db_finalize(&q);
  if(pM){
    manifest_destroy(pM);
  }
  cson_free_array( keyStore );

  free( zUuid );
  free( zD );
  return cson_object_value(zPayload);
}

/*
** Implements the /json/dir family of pages/commands.
**
*/
cson_value * json_page_dir(){
#if 1
  return json_page_dir_list();
#else
  return json_page_dispatch_helper(&JsonPageDefs_Dir[0]);
#endif
}

#endif /* FOSSIL_ENABLE_JSON */
