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# encoding: utf-8
=begin

* Name: SiSU

** Description: documents, structuring, processing, publishing, search
*** modules shared by the different db types, dbi, postgresql, sqlite

** Author: Ralph Amissah
  [ralph@amissah.com]
  [ralph.amissah@gmail.com]

** Copyright: (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006,
  2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016 Ralph Amissah,
  All Rights Reserved.

** License: GPL 3 or later:

  SiSU, a framework for document structuring, publishing and search

  Copyright (C) Ralph Amissah

  This program is free software: you can redistribute it and/or modify it
  under the terms of the GNU General Public License as published by the Free
  Software Foundation, either version 3 of the License, or (at your option)
  any later version.

  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. See the GNU General Public License for
  more details.

  You should have received a copy of the GNU General Public License along with
  this program. If not, see [http://www.gnu.org/licenses/].

  If you have Internet connection, the latest version of the GPL should be
  available at these locations:
  [http://www.fsf.org/licensing/licenses/gpl.html]
  [http://www.gnu.org/licenses/gpl.html]

** SiSU uses:
  * Standard SiSU markup syntax,
  * Standard SiSU meta-markup syntax, and the
  * Standard SiSU object citation numbering and system

** Hompages:
  [http://www.jus.uio.no/sisu]
  [http://www.sisudoc.org]

** Git
  [http://git.sisudoc.org/gitweb/?p=code/sisu.git;a=summary]
  [http://git.sisudoc.org/gitweb/?p=code/sisu.git;a=blob;f=lib/sisu/db_drop.rb;hb=HEAD]

=end
module SiSU_DbDrop
  require_relative 'utils_response'                   # utils_response.rb
  class Drop
    include SiSU_Response
    def initialize(opt,conn,db_info,sql_type)
      @opt,@conn,@db_info,@sql_type=opt,conn,db_info,sql_type
      case @sql_type
      when :sqlite
        cascade=''
      else
        cascade='CASCADE'
      end
      @drop_table=[
        "DROP TABLE metadata_and_text #{cascade};",
        "DROP TABLE doc_objects #{cascade};",
        "DROP TABLE urls #{cascade};",
        "DROP TABLE endnotes #{cascade};",
        "DROP TABLE endnotes_asterisk #{cascade};",
        "DROP TABLE endnotes_plus #{cascade};",
      ]
    end
    def drop
      def tables                                                              #% drop all tables
        begin
          msg_sqlite="as not all disk space is recovered after dropping the database << #{@db_info.sqlite.db} >>, you may be better off deleting the file, and recreating it as necessary"
          case @sql_type
          when :sqlite
            puts msg_sqlite
            ans=response?('remove sql database?')
            if ans \
            and File.exist?(@db_info.sqlite.db)
              @conn.close
              File.unlink(@db_info.sqlite.db)
              db=SiSU_Env::InfoDb.new
              conn=db.sqlite.conn_sqlite3
              sdb=SiSU_DbDBI::Create.new(@opt,conn,@db_info,@sql_type)
              sdb_index=SiSU_DbDBI::Index.new(@opt,conn,@db_info,@sql_type)
              sdb.output_dir?
              begin
                sdb.create_db
                sdb.create_table.metadata_and_text
                sdb.create_table.doc_objects
                sdb.create_table.endnotes
                sdb.create_table.endnotes_asterisk
                sdb.create_table.endnotes_plus
                sdb.create_table.urls
                sdb_index.create_indexes
              rescue
                SiSU_Errors::Rescued.new($!,$@,'-D').location do
                  __LINE__.to_s + ':' + __FILE__
                end
                sdb.output_dir?
              end
              exit
            else
              @conn.transaction
              @drop_table.each do |d|
                begin
                  @conn.exec_params(d)
                rescue
                  next
                end
                end
              @conn.commit
            end
          when :pg
            @conn.transaction
            @drop_table.each do |d|
              begin
                @conn.exec_params(d)
              rescue
                next
              end
            end
            @conn.commit
          end
        rescue
          case @sql_type
          when :sqlite
            ans=response?('remove sql database?')
            if ans and File.exist?(@db_info.sqlite.db); File.unlink(@db_info.sqlite.db)
            end
          else
            @drop_table.each do |d|
              begin
                @conn.exec_params(d)
              rescue
                next
              end
            end
          end
        ensure
        end
      end
      def indexes
        def conn_execute_array(sql_arr)
          @conn.transaction do |conn|
            sql_arr.each do |sql|
              begin
                conn.exec_params(sql)
              rescue
                next
              end
            end
          end
        end
        def base                                                             #% drop base indexes
          print "\n          drop documents common indexes\n" unless @opt.act[:quiet][:set]==:on
          sql_arr=[
            %{DROP INDEX idx_title;},
            %{DROP INDEX idx_author;},
            %{DROP INDEX idx_filename;},
            %{DROP INDEX idx_topics;},
            %{DROP INDEX idx_ocn;},
            %{DROP INDEX idx_digest_clean;},
            %{DROP INDEX idx_digest_all;},
            %{DROP INDEX idx_lev0;},
            %{DROP INDEX idx_lev1;},
            %{DROP INDEX idx_lev2;},
            %{DROP INDEX idx_lev3;},
            %{DROP INDEX idx_lev4;},
            %{DROP INDEX idx_lev5;},
            %{DROP INDEX idx_lev6;},
            %{DROP INDEX idx_endnote_nr;},
            %{DROP INDEX idx_digest_en;},
            %{DROP INDEX idx_endnote_nr_asterisk;},
            %{DROP INDEX idx_endnote_asterisk;},
            %{DROP INDEX idx_digest_en_asterisk;},
            %{DROP INDEX idx_endnote_nr_plus;},
            %{DROP INDEX idx_endnote_plus;},
            %{DROP INDEX idx_digest_en_plus},
          ]
          conn_execute_array(sql_arr)
        end
        def text                                                             #% drop TEXT indexes, sqlite
          print "\n          drop documents TEXT indexes\n" unless @opt.act[:quiet][:set]==:on
          sql_arr=[
            %{DROP INDEX idx_clean;},
            %{DROP INDEX idx_endnote},
          ]
          conn_execute_array(sql_arr)
        end
        self
      end
      indexes.base
      @opt.act[:psql][:set]==:on ? '' : indexes.text
      self
    end
  end
end
__END__