#! /usr/bin/env ruby
#
# GoogleMapGenerator - auto-generate GoogleMap's html and javascript code
#
#
# Version : 0.1.0
# Author  : Kazuki Ohta <mover _at_ hct.zaq.ne.jp>
#
# Copyright (C) 2005-2006 Kazuki Ohta
#
#   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 2, 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, write to the Free Software Foundation,
#   Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.

module GoogleMapGenerator
  class LocationData
    class InvalidLocationDataError < StandardError; end

    attr_reader :label, :latitude, :longtitude, :description

    def initialize(label, latitude, longtitude, description)
      @label       = label
      @latitude    = latitude
      @longtitude  = longtitude
      @description = description.sub(/\n/, "")

      check_data(@latitude)
      check_data(@longtitude)
    end

    private
    def check_data(data)
      if data =~ /\d+\.\d+/
        return true
      else
        raise InvalidLocationDataError.new("invalid location data : " + data)
      end
    end
  end

  class Generator
    def initialize(apikey)
      @apikey   = apikey
      @funcs    = []
      @handlers = []
      @center_latitude   = ""
      @center_longtitude = ""
      @center_zoom       = 1
      @width   = 300
      @height  = 300
      @control = false
      @markers = []
    end

    def add_event_handler(raw_code)
      @handlers.push raw_code
    end

    def add_function(raw_code)
      @funcs.push raw_code
    end

    def set_center(latitude, longtitude, zoom)
      @center_latitude   = latitude
      @center_longtitude = longtitude
      @center_zoom       = zoom.to_s
    end
    
    def set_width(width)
      @width = width
    end

    def set_height(height)
      @height = height
    end

    def add_control
      @control = "map.addControl(new GLargeMapControl());
                  map.addControl(new GMapTypeControl());"
    end

    def add_marker(location)
      @markers.push location
    end

    def gen_header
      "<script src=\"http://maps.google.com/maps?file=api&v=1&key=#{@apikey}\" type=\"text/javascript\"></script>"
    end

    def gen_jsbody
      "<div id=\"map\" style=\"width: #{@width}px; height: #{@height}px;\"></div>
      <script type=\"text/javascript\">
      //<![CDATA[
      function addMarker( map, lat, lng, html ) {
        var point = new GPoint( lat, lng );
        var marker = new GMarker( point );

        GEvent.addListener( marker, \"click\", function() {
          marker.openInfoWindowHtml( html );
          document.getElementById(\"latitude\").setAttribute(\"value\", point.y);
          document.getElementById(\"longtitude\").setAttribute(\"value\", point.x);
        } );
        map.addOverlay( marker );
      }
      function goAndSee(lat, lng) {
        var point = new GPoint(lng, lat);
        map.centerAndZoom(point, 0);
      }
      #{add_funcs_to_str}
      if (GBrowserIsCompatible()) {
        var map = new GMap(document.getElementById(\"map\"));
        #{add_handlers_to_str}
        #{@control}
        map.centerAndZoom(new GPoint(#{@center_longtitude}, #{@center_latitude}), #{@center_zoom});
        #{add_markers_to_str}
      }
      //]]>
      </script>"
    end

    private
    def add_funcs_to_str
      ret = ""
      @funcs.each { |func|
        ret += func + "\n"
      }
      ret
    end
    def add_handlers_to_str
      ret = ""
      @handlers.each { |handler|
        ret += handler + "\n"
      }
      ret
    end
    def add_markers_to_str
      ret = ""
      @markers.each { |marker|
        ret += "addMarker( map, #{marker.longtitude}, #{marker.latitude}, '#{marker.description}' );\n"
      }
      ret
    end
  end
end

gen = GoogleMapGenerator::Generator.new($YOUR_GOOGLE_MAP_APIKEY)
gen.set_center("-122.1419", "37.4419", 4)
gen.add_control
print "Content-Type: text/html\n\n"
print "
<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.0 Strict//EN\" \"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd\">
<html xmlns=\"http://www.w3.org/1999/xhtml\">
  <head>\n"
print gen.gen_header
print "
</head>
<body>\n"
print gen.gen_jsbody
print "
</body>
</html>"