#!/usr/bin/env ruby
  
  #--
  # This file is a part of the mirimiri library
  #
  # Copyright (C) 2010-2011 Romain Deveaud <romain.deveaud@gmail.com>
  #
  # 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/>.
  #++
  
  class Query
  end
  
  module Indri
  
    class Parameters
      attr_accessor :index_path, :memory, :count, :offset, :run_id, :print_query, :print_docs, :rule, :baseline

      def initialize(corpus,count="1000",mem="1g",threads="1",offset="1",run_id="default",print_query=false,print_docs=false)

        @index_path  = corpus
        @memory      = mem
        @count       = count

        @threads     = threads

        @offset      = offset
        @run_id      = run_id
        @print_query = print_query ? "true" : "false"
        @print_docs  = print_docs  ? "true" : "false"
      end
  
      def to_s

        h = "<memory>#{@memory}</memory>
  "

        h += "<index>#{@index_path}</index>
  "
        h += "<count>#{@count}</count>
  "

        h += "<threads>#{@threads}</threads>
  "

        unless @baseline.nil?
          h += "<baseline>#{@baseline}</baseline>
  " 
        else
          h += "<rule>#{@rule}</rule>
  "
        end

        h += "<trecFormat>true</trecFormat>
  "

        h += "<queryOffset>#{@offset}</queryOffset>
  "
        h += "<runID>#{@run_id}</runID>
  "
        h += "<printQuery>#{@print_query}</printQuery>
  "
        h += "<printDocuments>#{@print_docs}</printDocuments>
  "
  
        h
      end
    end

    class IndriQueryOld < Query

      attr_accessor :id, :query, :rule

      def initialize(id,query)

        @id     = id
        @query  = query
      end
  
      def to_s

        h = "<query>
  "

        h += "<number>#{@id}</number>
  "
        h += "<text>#{@query}</text>
  "
        h += "</query>
  "

  
        h
      end

  
      def exec params
        `IndriRunQuery -query='#{@query}' -index=#{params.index_path} -count=#{params.count} -rule=method:dirichlet,mu:2500 -trecFormat`
      end

    end

    class IndriQuery < Query
      attr_accessor :query, :count, :sm_method, :sm_param, :sm_value, :args
  
      def initialize atts={},args=nil
        raise ArgumentError, 'Argument 1 must be a Hash' unless args.is_a? Hash
        atts.each do |k,v|
          instance_variable_set("@#{k}", v) unless v.nil?
        end
  
        raise ArgumentError, 'Argument 2 must be a String' unless args.is_a? String
        @args = args 
      end
    end

    class IndriQueries
      attr_accessor :params, :queries
  
      def initialize(params,*queries)
        @queries = queries    
  
        @params = params
        # Here we set the default retrieval model as Language Modeling
        # with a Dirichlet smoothing at 2500.
        # TODO: maybe a Rule class...
        @params.rule  = 'method:dirichlet,mu:2500' if @params.rule.nil?
      end
  
      def to_s
        h = "<parameters>
  "
        h += @params.to_s
        h += @queries.collect { |q| q.to_s }.join ""

        h += "</parameters>"
  
        h
      end
    end
  
  end