# -----------------------------------------------------------------------------
# 
# PostGIS adapter for ActiveRecord
# 
# -----------------------------------------------------------------------------
# Copyright 2010 Daniel Azuma
# 
# All rights reserved.
# 
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
# 
# * Redistributions of source code must retain the above copyright notice,
#   this list of conditions and the following disclaimer.
# * Redistributions in binary form must reproduce the above copyright notice,
#   this list of conditions and the following disclaimer in the documentation
#   and/or other materials provided with the distribution.
# * Neither the name of the copyright holder, nor the names of any other
#   contributors to this software, may be used to endorse or promote products
#   derived from this software without specific prior written permission.
# 
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
# -----------------------------------------------------------------------------
;


# :stopdoc:

module ActiveRecord
  
  module ConnectionAdapters
    
    module PostGISAdapter
      
      
      class SpatialColumn < ConnectionAdapters::PostgreSQLColumn
        
        
        def initialize(name_, default_, sql_type_=nil, null_=true, opts_=nil)
          super(name_, default_, sql_type_, null_)
          @geographic = sql_type_ =~ /geography/i ? true : false
          if opts_
            @geometric_type = ::RGeo::ActiveRecord.geometric_type_from_name(opts_[:type])
            @srid = opts_[:srid].to_i
            @has_z = opts_[:has_z]
            @has_m = opts_[:has_m]
          elsif @geographic
            @geometric_type = ::RGeo::Feature::Geometry
            @srid = 4326
            @has_z = @has_m = false
            if sql_type_ =~ /geography\((.*)\)$/i
              params_ = $1.split(',')
              if params_.size >= 2
                if params_.first =~ /([a-z]+[^zm])(z?)(m?)/i
                  @has_z = $2.length > 0
                  @has_m = $3.length > 0
                  @geometric_type = ::RGeo::ActiveRecord.geometric_type_from_name($1)
                end
                if params_.last =~ /(\d+)/
                  @srid = $1.to_i
                end
              end
            end
          else
            @geometric_type = @has_z = @has_m = nil
            @srid = 0
          end
          if type == :spatial
            @limit = {:srid => @srid, :type => @geometric_type.type_name.underscore}
            @limit[:has_z] = true if @has_z
            @limit[:has_m] = true if @has_m
            @limit[:geographic] = true if @geographic
          end
          @ar_class = ::ActiveRecord::Base
        end
        
        
        def set_ar_class(val_)
          @ar_class = val_
        end
        
        
        attr_reader :geographic
        attr_reader :srid
        attr_reader :geometric_type
        attr_reader :has_z
        attr_reader :has_m
        
        alias_method :geographic?, :geographic
        alias_method :has_z?, :has_z
        alias_method :has_m?, :has_m
        
        
        def spatial?
          type == :spatial
        end
        
        
        def klass
          type == :spatial ? ::RGeo::Feature::Geometry : super
        end
        
        
        def type_cast(value_)
          type == :spatial ? SpatialColumn.convert_to_geometry(value_, @ar_class, name, @geographic, @srid, @has_z, @has_m) : super
        end
        
        
        def type_cast_code(var_name_)
          type == :spatial ? "::ActiveRecord::ConnectionAdapters::PostGISAdapter::SpatialColumn.convert_to_geometry(#{var_name_}, self.class, #{name.inspect}, #{@geographic ? 'true' : 'false'}, #{@srid.inspect}, #{@has_z ? 'true' : 'false'}, #{@has_m ? 'true' : 'false'})" : super
        end
        
        
        private
        
        
        def simplified_type(sql_type_)
          sql_type_ =~ /geography|geometry|point|linestring|polygon/i ? :spatial : super
        end
        
        
        def self.convert_to_geometry(input_, ar_class_, column_, geographic_, srid_, has_z_, has_m_)
          case input_
          when ::RGeo::Feature::Geometry
            factory_ = ar_class_.rgeo_factory_for_column(column_, :srid => srid_, :has_z_coordinate => has_z_, :has_m_coordinate => has_m_, :geographic => geographic_)
            ::RGeo::Feature.cast(input_, factory_)
          when ::String
            if input_.length == 0
              nil
            else
              factory_ = ar_class_.rgeo_factory_for_column(column_, :srid => srid_, :has_z_coordinate => has_z_, :has_m_coordinate => has_m_, :geographic => geographic_)
              marker_ = input_[0,1]
              if marker_ == "\x00" || marker_ == "\x01"
                ::RGeo::WKRep::WKBParser.new(factory_, :support_ewkb => true).parse(input_) rescue nil
              elsif input_[0,4] =~ /[0-9a-fA-F]{4}/
                ::RGeo::WKRep::WKBParser.new(factory_, :support_ewkb => true).parse_hex(input_) rescue nil
              else
                ::RGeo::WKRep::WKTParser.new(factory_, :support_ewkt => true).parse(input_) rescue nil
              end
            end
          else
            nil
          end
        end
        
        
      end
      
      
    end
    
    
  end
  
  
end

# :startdoc: