# app/controllers/request_controller.rb:
# Show information about one particular request.
#
# Copyright (c) 2007 UK Citizens Online Democracy. All rights reserved.
# Email: francis@mysociety.org; WWW: http://www.mysociety.org/
#
# $Id: request_controller.rb,v 1.192 2009-10-19 19:26:40 francis Exp $

require 'alaveteli_file_types'
require 'zip/zip'
require 'open-uri'

class RequestController < ApplicationController
    before_filter :check_read_only, :only => [ :new, :show_response, :describe_state, :upload_response ]
    protect_from_forgery :only => [ :new, :show_response, :describe_state, :upload_response ] # See ActionController::RequestForgeryProtection for details

    MAX_RESULTS = 500
    PER_PAGE = 25
    
    @@custom_states_loaded = false
    begin
        if ENV["RAILS_ENV"] != "test"
            require 'customstates'
            include RequestControllerCustomStates
            @@custom_states_loaded = true
        end
    rescue MissingSourceFile, NameError
    end

    def select_authority
        # Check whether we force the user to sign in right at the start, or we allow her
        # to start filling the request anonymously
        if force_registration_on_new_request && !authenticated?(
                :web => _("To send your FOI request"),
                :email => _("Then you'll be allowed to send FOI requests."),
                :email_subject => _("Confirm your email address")
            )
            # do nothing - as "authenticated?" has done the redirect to signin page for us
            return
        end
        if !params[:query].nil?
            query = params[:query]
            @xapian_requests = perform_search_typeahead(query, PublicBody)
        end
        medium_cache
    end
    
    def show
        medium_cache
        @locale = self.locale_from_params()
        PublicBody.with_locale(@locale) do  

            # Look up by old style numeric identifiers
            if params[:url_title].match(/^[0-9]+$/)
                @info_request = InfoRequest.find(params[:url_title].to_i)
                redirect_to request_url(@info_request)
                return
            end

            # Look up by new style text names 
            @info_request = InfoRequest.find_by_url_title(params[:url_title])
            if @info_request.nil?
                raise ActiveRecord::RecordNotFound.new("Request not found")
            end
            set_last_request(@info_request)

            # Test for whole request being hidden
            if !@info_request.user_can_view?(authenticated_user)
                render :template => 'request/hidden', :status => 410 # gone
                return
            end
           
            # Other parameters
            @info_request_events = @info_request.info_request_events
            @status = @info_request.calculate_status
            @collapse_quotes = params[:unfold] ? false : true
            @update_status = params[:update_status] ? true : false
            @old_unclassified = @info_request.is_old_unclassified? && !authenticated_user.nil?
            @is_owning_user = @info_request.is_owning_user?(authenticated_user)
            
            if @update_status
                return if !@is_owning_user && !authenticated_as_user?(@info_request.user,
                        :web => _("To update the status of this FOI request"),
                        :email => _("Then you can update the status of your request to ") + @info_request.public_body.name + ".",
                        :email_subject => _("Update the status of your request to ") + @info_request.public_body.name
                    )
            end
            

            @last_info_request_event_id = @info_request.last_event_id_needing_description
            @new_responses_count = @info_request.events_needing_description.select {|i| i.event_type == 'response'}.size

            # Sidebar stuff
            # ... requests that have similar imporant terms
            behavior_cache :tag => ['similar', @info_request.id] do
                begin
                    limit = 10
                    @xapian_similar = ::ActsAsXapian::Similar.new([InfoRequestEvent], @info_request.info_request_events, 
                      :limit => limit, :collapse_by_prefix => 'request_collapse')
                    @xapian_similar_more = (@xapian_similar.matches_estimated > limit)
                rescue
                    @xapian_similar = nil
                end
            end
         
            # Track corresponding to this page
            @track_thing = TrackThing.create_track_for_request(@info_request)
            @feed_autodetect = [ { :url => do_track_url(@track_thing, 'feed'), :title => @track_thing.params[:title_in_rss], :has_json => true } ]

            # For send followup link at bottom
            @last_response = @info_request.get_last_response
            respond_to do |format|
                format.html { @has_json = true; render :template => 'request/show'}
                format.json { render :json => @info_request.json_for_api(true) }
            end
        end
    end

    # Extra info about a request, such as event history
    def details
        long_cache
        @info_request = InfoRequest.find_by_url_title(params[:url_title])
        if @info_request.nil?
            raise ActiveRecord::RecordNotFound.new("Request not found")
        else            
            if !@info_request.user_can_view?(authenticated_user)
                render :template => 'request/hidden', :status => 410 # gone
                return
            end
        end
        @columns = ['id', 'event_type', 'created_at', 'described_state', 'last_described_at', 'calculated_state' ]
    end

    # Requests similar to this one
    def similar
        short_cache
        @per_page = 25
        @page = (params[:page] || "1").to_i
        @info_request = InfoRequest.find_by_url_title(params[:url_title])
        if !@info_request.user_can_view?(authenticated_user)
            render :template => 'request/hidden', :status => 410 # gone
            return
        end
        @xapian_object = ::ActsAsXapian::Similar.new([InfoRequestEvent], @info_request.info_request_events, 
            :offset => (@page - 1) * @per_page, :limit => @per_page, :collapse_by_prefix => 'request_collapse')
        
        if (@page > 1)
            @page_desc = " (page " + @page.to_s + ")" 
        else    
            @page_desc = ""
        end
    end

    def list
        medium_cache
        @view = params[:view]
        @page = get_search_page_from_params if !@page # used in cache case, as perform_search sets @page as side effect
        if @view == "recent"
            return redirect_to request_list_all_path(:action => "list", :view => "all", :page => @page), :status => :moved_permanently
        end
        
        # Later pages are very expensive to load
        if @page > MAX_RESULTS / PER_PAGE
            raise ActiveRecord::RecordNotFound.new("Sorry. No pages after #{MAX_RESULTS / PER_PAGE}.")
        end

        params[:latest_status] = @view
        query = make_query_from_params
        @title = _("View and search requests")
        sortby = "newest"
        @cache_tag = Digest::MD5.hexdigest(query + @page.to_s) 
        behavior_cache :tag => [@cache_tag] do
            xapian_object = perform_search([InfoRequestEvent], query, sortby, 'request_collapse')
            @list_results = xapian_object.results.map { |r| r[:model] }
            @matches_estimated = xapian_object.matches_estimated
            @show_no_more_than = (@matches_estimated > MAX_RESULTS) ? MAX_RESULTS : @matches_estimated
        end
        
        @title = @title + " (page " + @page.to_s + ")" if (@page > 1)
        @track_thing = TrackThing.create_track_for_search_query(query)
        @feed_autodetect = [ { :url => do_track_url(@track_thing, 'feed'), :title => @track_thing.params[:title_in_rss], :has_json => true } ]

        # Don't let robots go more than 20 pages in
        if @page > 20
            @no_crawl = true
        end
    end

    # Page new form posts to
    def new
        # All new requests are of normal_sort
        if !params[:outgoing_message].nil?
            params[:outgoing_message][:what_doing] = 'normal_sort'
        end

        # If we've just got here (so no writing to lose), and we're already
        # logged in, force the user to describe any undescribed requests. Allow
        # margin of 1 undescribed so it isn't too annoying - the function
        # get_undescribed_requests also allows one day since the response
        # arrived.
        if !@user.nil? && params[:submitted_new_request].nil? && !@user.can_leave_requests_undescribed?
            @undescribed_requests = @user.get_undescribed_requests 
            if @undescribed_requests.size > 1
                render :action => 'new_please_describe'
                return
            end
        end

        # Banned from making new requests?
        user_exceeded_limit = false
        if !authenticated_user.nil? && !authenticated_user.can_file_requests?
            # If the reason the user cannot make new requests is that they are
            # rate-limited, it’s possible they composed a request before they
            # logged in and we want to include the text of the request so they
            # can squirrel it away for tomorrow, so we detect this later after
            # we have constructed the InfoRequest.
            user_exceeded_limit = authenticated_user.exceeded_limit?
            if !user_exceeded_limit
                @details = authenticated_user.can_fail_html
                render :template => 'user/banned'
                return
            end
        end

        # First time we get to the page, just display it
        if params[:submitted_new_request].nil? || params[:reedit]
            if user_exceeded_limit
                render :template => 'user/rate_limited'
                return
            end

            params[:info_request] = { } if !params[:info_request]

            # Read parameters in - first the public body (by URL name or id)
            if params[:url_name]
                if params[:url_name].match(/^[0-9]+$/)
                    params[:info_request][:public_body_id] = params[:url_name]
                else
                    public_body = PublicBody.find_by_url_name_with_historic(params[:url_name])
                    raise ActiveRecord::RecordNotFound.new("None found") if public_body.nil? # XXX proper 404
                    params[:info_request][:public_body_id] = public_body.id
                end
            elsif params[:public_body_id]
                params[:info_request][:public_body_id] = params[:public_body_id]
            end
            if !params[:info_request][:public_body_id] 
                # compulsory to have a body by here, or go to front page which is start of process
                redirect_to frontpage_url
                return
            end

            # ... next any tags or other things
            params[:info_request][:title] = params[:title] if params[:title]
            params[:info_request][:tag_string] = params[:tags] if params[:tags]

            @info_request = InfoRequest.new(params[:info_request])
            params[:info_request_id] = @info_request.id
            params[:outgoing_message] = {} if !params[:outgoing_message]
            params[:outgoing_message][:body] = params[:body] if params[:body]
            params[:outgoing_message][:default_letter] = params[:default_letter] if params[:default_letter]
            params[:outgoing_message][:info_request] = @info_request
            @outgoing_message = OutgoingMessage.new(params[:outgoing_message])
            @outgoing_message.set_signature_name(@user.name) if !@user.nil?
            
            if @info_request.public_body.is_requestable?
                render :action => 'new'
            else
                if @info_request.public_body.not_requestable_reason == 'bad_contact'
                    render :action => 'new_bad_contact'
                else
                    # if not requestable because defunct or not_apply, redirect to main page
                    # (which doesn't link to the /new/ URL)
                    redirect_to public_body_url(@info_request.public_body)
                end
            end
            return
        end

        # See if the exact same request has already been submitted
        # XXX this check should theoretically be a validation rule in the
        # model, except we really want to pass @existing_request to the view so
        # it can link to it.
        @existing_request = InfoRequest.find_by_existing_request(params[:info_request][:title], params[:info_request][:public_body_id], params[:outgoing_message][:body])

        # Create both FOI request and the first request message
        @info_request = InfoRequest.new(params[:info_request])
        @outgoing_message = OutgoingMessage.new(params[:outgoing_message].merge({ 
            :status => 'ready', 
            :message_type => 'initial_request'
        }))
        @info_request.outgoing_messages << @outgoing_message
        @outgoing_message.info_request = @info_request

        # Maybe we lost the address while they're writing it
        if !@info_request.public_body.is_requestable?
            render :action => 'new_' + @info_request.public_body.not_requestable_reason
            return
        end

        # See if values were valid or not
        if !@existing_request.nil? || !@info_request.valid?
            # We don't want the error "Outgoing messages is invalid", as the outgoing message
            # will be valid for a specific reason which we are displaying anyway.
            @info_request.errors.delete("outgoing_messages")
            render :action => 'new'
            return
        end

        # Show preview page, if it is a preview
        if params[:preview].to_i == 1
            message = ""
            if @outgoing_message.contains_email?
                if @user.nil? 
                    message += _("<p>You do not need to include your email in the request in order to get a reply, as we will ask for it on the next screen (<a href=\"%s\">details</a>).</p>") % [help_privacy_path+"#email_address"];
                else
                    message += _("<p>You do not need to include your email in the request in order to get a reply (<a href=\"%s\">details</a>).</p>") % [help_privacy_path+"#email_address"];
                end
                message += _("<p>We recommend that you edit your request and remove the email address.
                If you leave it, the email address will be sent to the authority, but will not be displayed on the site.</p>")
            end
            if @outgoing_message.contains_postcode?
                message += _("<p>Your request contains a <strong>postcode</strong>. Unless it directly relates to the subject of your request, please remove any address as it will <strong>appear publicly on the Internet</strong>.</p>");
            end
            if not message.empty?
                flash.now[:error] = message
            end
            render :action => 'preview'
            return
        end

        if user_exceeded_limit
            render :template => 'user/rate_limited'
            return
        end

        if !authenticated?(
                :web => _("To send your FOI request"),
                :email => _("Then your FOI request to {{public_body_name}} will be sent.",:public_body_name=>@info_request.public_body.name),
                :email_subject => _("Confirm your FOI request to ") + @info_request.public_body.name
            )
            # do nothing - as "authenticated?" has done the redirect to signin page for us
            return
        end

        @info_request.user = authenticated_user
        # This automatically saves dependent objects, such as @outgoing_message, in the same transaction
        @info_request.save!
        # XXX send_message needs the database id, so we send after saving, which isn't ideal if the request broke here.
        @outgoing_message.send_message
        flash[:notice] = _("<p>Your {{law_used_full}} request has been <strong>sent on its way</strong>!</p>
            <p><strong>We will email you</strong> when there is a response, or after {{late_number_of_days}} working days if the authority still hasn't
            replied by then.</p>
            <p>If you write about this request (for example in a forum or a blog) please link to this page, and add an 
            annotation below telling people about your writing.</p>",:law_used_full=>@info_request.law_used_full,
            :late_number_of_days => MySociety::Config.get('REPLY_LATE_AFTER_DAYS', 20))
        redirect_to show_new_request_path(:url_title => @info_request.url_title)
    end

    # Submitted to the describing state of messages form
    def describe_state
        @info_request = InfoRequest.find(params[:id].to_i)
        set_last_request(@info_request)

        # If this isn't a form submit, go to the request page
        if params[:submitted_describe_state].nil?
            redirect_to request_url(@info_request)
            return
        end

        @is_owning_user = @info_request.is_owning_user?(authenticated_user)       
        @last_info_request_event_id = @info_request.last_event_id_needing_description
        @old_unclassified = @info_request.is_old_unclassified? && !authenticated_user.nil?
        
        # Check authenticated, and parameters set. We check is_owning_user
        # to get admin overrides (see is_owning_user? above)
        if !@old_unclassified && !@is_owning_user && !authenticated_as_user?(@info_request.user,
                :web => _("To classify the response to this FOI request"),
                :email => _("Then you can classify the FOI response you have got from ") + @info_request.public_body.name + ".",
                :email_subject => _("Classify an FOI response from ") + @info_request.public_body.name
            )
            # do nothing - as "authenticated?" has done the redirect to signin page for us
            return
        end

        if !params[:incoming_message]
            flash[:error] = _("Please choose whether or not you got some of the information that you wanted.")
            redirect_to request_url(@info_request)
            return
        end

        if params[:last_info_request_event_id].to_i != @last_info_request_event_id
            flash[:error] = _("The request has been updated since you originally loaded this page. Please check for any new incoming messages below, and try again.")
            redirect_to request_url(@info_request)
            return
        end

        # Make the state change
        old_described_state = @info_request.described_state
        @info_request.set_described_state(params[:incoming_message][:described_state])
        
        # If you're not the *actual* requester owner. e.g. you are playing the
        # classification game, or you're doing this just because you are an
        # admin user (not because you also own the request).
        if !@info_request.is_actual_owning_user?(authenticated_user)
            # Log what you did, for classification game score purposes. We
            # don't log if you were the requester XXX This is presumably so you
            # don't score for classifying your own requests. Could instead
            # always log and filter at display time.
            @info_request.log_event("status_update", 
                { :user_id => authenticated_user.id, 
                  :old_described_state => old_described_state, 
                  :described_state => @info_request.described_state,
                })
            
            # Don't give advice on what to do next, as it isn't their request
            RequestMailer.deliver_old_unclassified_updated(@info_request)
            if session[:request_game] 
                flash[:notice] = _('Thank you for updating the status of the request \'<a href="{{url}}">{{info_request_title}}</a>\'. There are some more requests below for you to classify.',:info_request_title=>CGI.escapeHTML(@info_request.title), :url=>CGI.escapeHTML(request_url(@info_request)))
                redirect_to play_url 
            else
                flash[:notice] = _('Thank you for updating this request!')
                redirect_to request_url(@info_request)
            end
            return
        end
        
        # Display advice for requester on what to do next, as appropriate
        if @info_request.calculate_status == 'waiting_response'
            flash[:notice] = _("<p>Thank you! Hopefully your wait isn't too long.</p> <p>By law, you should get a response promptly, and normally before the end of <strong>
{{date_response_required_by}}</strong>.</p>",:date_response_required_by=>simple_date(@info_request.date_response_required_by))
            redirect_to request_url(@info_request)
        elsif @info_request.calculate_status == 'waiting_response_overdue'
            flash[:notice] = _("<p>Thank you! Hope you don't have to wait much longer.</p> <p>By law, you should have got a response promptly, and normally before the end of <strong>{{date_response_required_by}}</strong>.</p>",:date_response_required_by=>simple_date(@info_request.date_response_required_by))
            redirect_to request_url(@info_request)
        elsif @info_request.calculate_status == 'waiting_response_very_overdue'
            flash[:notice] = _("<p>Thank you! Your request is long overdue, by more than {{very_late_number_of_days}} working days. Most requests should be answered within {{late_number_of_days}} working days. You might like to complain about this, see below.</p>", :very_late_number_of_days => MySociety::Config.get('REPLY_VERY_LATE_AFTER_DAYS', 40), :late_number_of_days => MySociety::Config.get('REPLY_LATE_AFTER_DAYS', 20))
            redirect_to unhappy_url(@info_request)
        elsif @info_request.calculate_status == 'not_held'
            flash[:notice] = _("<p>Thank you! Here are some ideas on what to do next:</p>
            <ul>
            <li>To send your request to another authority, first copy the text of your request below, then <a href=\"{{find_authority_url}}\">find the other authority</a>.</li>
            <li>If you would like to contest the authority's claim that they do not hold the information, here is 
            <a href=\"{{complain_url}}\">how to complain</a>.
            </li>
            <li>We have <a href=\"{{other_means_url}}\">suggestions</a>
            on other means to answer your question.
            </li>
            </ul>", 
            :find_authority_url => "/new", 
            :complain_url => CGI.escapeHTML(unhappy_url(@info_request)),
            :other_means_url => CGI.escapeHTML(unhappy_url(@info_request)) + "#other_means")
            redirect_to request_url(@info_request)
        elsif @info_request.calculate_status == 'rejected'
            flash[:notice] = _("Oh no! Sorry to hear that your request was refused. Here is what to do now.")
            redirect_to unhappy_url(@info_request)
        elsif @info_request.calculate_status == 'successful'
            flash[:notice] = _("<p>We're glad you got all the information that you wanted. If you write about or make use of the information, please come back and add an annotation below saying what you did.</p><p>If you found {{site_name}} useful, <a href=\"{{donation_url}}\">make a donation</a> to the charity which runs it.</p>", :site_name=>site_name, :donation_url => "http://www.mysociety.org/donate/")
            redirect_to request_url(@info_request)
        elsif @info_request.calculate_status == 'partially_successful'
            flash[:notice] = _("<p>We're glad you got some of the information that you wanted. If you found {{site_name}} useful, <a href=\"{{donation_url}}\">make a donation</a> to the charity which runs it.</p><p>If you want to try and get the rest of the information, here's what to do now.</p>", :site_name=>site_name, :donation_url=>"http://www.mysociety.org/donate/")
            redirect_to unhappy_url(@info_request)
        elsif @info_request.calculate_status == 'waiting_clarification'
            flash[:notice] = _("Please write your follow up message containing the necessary clarifications below.")
            redirect_to respond_to_last_url(@info_request)
        elsif @info_request.calculate_status == 'gone_postal'
            redirect_to respond_to_last_url(@info_request) + "?gone_postal=1"
        elsif @info_request.calculate_status == 'internal_review'
            flash[:notice] = _("<p>Thank you! Hopefully your wait isn't too long.</p><p>You should get a response within {{late_number_of_days}} days, or be told if it will take longer (<a href=\"{{review_url}}\">details</a>).</p>",:late_number_of_days => MySociety::Config.get('REPLY_LATE_AFTER_DAYS', 20), :review_url => unhappy_url(@info_request) + "#internal_review")
            redirect_to request_url(@info_request)
        elsif @info_request.calculate_status == 'error_message'
            flash[:notice] = _("<p>Thank you! We'll look into what happened and try and fix it up.</p><p>If the error was a delivery failure, and you can find an up to date FOI email address for the authority, please tell us using the form below.</p>")
            redirect_to help_general_url(:action => 'contact')
        elsif @info_request.calculate_status == 'requires_admin'
            flash[:notice] = _("Please use the form below to tell us more.")
            redirect_to help_general_url(:action => 'contact')
        elsif @info_request.calculate_status == 'user_withdrawn'
            flash[:notice] = _("If you have not done so already, please write a message below telling the authority that you have withdrawn your request. Otherwise they will not know it has been withdrawn.")
            redirect_to respond_to_last_url(@info_request)
        else
            if @@custom_states_loaded
                return self.theme_describe_state(@info_request)
            else
                raise "unknown calculate_status " + @info_request.calculate_status
            end
        end
    end

    # Used for links from polymorphic URLs e.g. in Atom feeds - just redirect to 
    # proper URL for the message the event refers to
    def show_request_event
        @info_request_event = InfoRequestEvent.find(params[:info_request_event_id])
        if @info_request_event.is_incoming_message?
            redirect_to incoming_message_url(@info_request_event.incoming_message), :status => :moved_permanently
        elsif @info_request_event.is_outgoing_message?
            redirect_to outgoing_message_url(@info_request_event.outgoing_message), :status => :moved_permanently
        else
            # XXX maybe there are better URLs for some events than this
            redirect_to request_url(@info_request_event.info_request), :status => :moved_permanently 
        end 
    end

    # Show an individual incoming message, and allow followup
    def show_response
        # Banned from making new requests?
        if !authenticated_user.nil? && !authenticated_user.can_make_followup?
            @details = authenticated_user.can_fail_html
            render :template => 'user/banned'
            return
        end

        if params[:incoming_message_id].nil?
            @incoming_message = nil
        else
            @incoming_message = IncomingMessage.find(params[:incoming_message_id])
        end

        @info_request = InfoRequest.find(params[:id].to_i)
        set_last_request(@info_request)

        @collapse_quotes = params[:unfold] ? false : true
        @is_owning_user = @info_request.is_owning_user?(authenticated_user)
        @gone_postal = params[:gone_postal] ? true : false
        if !@is_owning_user
            @gone_postal = false
        end

        if @gone_postal
            who_can_followup_to = @info_request.who_can_followup_to
            if who_can_followup_to.size == 0
                @postal_email = @info_request.request_email
                @postal_email_name = @info_request.name
            else
                @postal_email = who_can_followup_to[-1][1]
                @postal_email_name = who_can_followup_to[-1][0]
            end
        end


        params_outgoing_message = params[:outgoing_message]
        if params_outgoing_message.nil?
            params_outgoing_message = {}
        end
        params_outgoing_message.merge!({ 
            :status => 'ready', 
            :message_type => 'followup',
            :incoming_message_followup => @incoming_message,
            :info_request_id => @info_request.id
        })
        @internal_review = false
        @internal_review_pass_on = false
        if !params[:internal_review].nil?
            params_outgoing_message[:what_doing] = 'internal_review'
            @internal_review = true
            @internal_review_pass_on = true
        end
        @outgoing_message = OutgoingMessage.new(params_outgoing_message)
        @outgoing_message.set_signature_name(@user.name) if !@user.nil?

        if (not @incoming_message.nil?) and @info_request != @incoming_message.info_request
            raise sprintf("Incoming message %d does not belong to request %d", @incoming_message.info_request_id, @info_request.id)
        end

        # Test for hidden requests
        if !authenticated_user.nil? && !@info_request.user_can_view?(authenticated_user)
            render :template => 'request/hidden', :status => 410 # gone
            return
        end
 
        # Check address is good
        if !OutgoingMailer.is_followupable?(@info_request, @incoming_message)
            raise "unexpected followupable inconsistency" if @info_request.public_body.is_requestable?
            @reason = @info_request.public_body.not_requestable_reason
            render :action => 'followup_bad'
            return
        end

        # Force login early - this is really the "send followup" form. We want
        # to make sure they're the right user first, before they start writing a
        # message and wasting their time if they are not the requester.
        if !authenticated_as_user?(@info_request.user,
                :web => @incoming_message.nil? ? 
                    _("To send a follow up message to ") + @info_request.public_body.name :
                    _("To reply to ") + @info_request.public_body.name,
                :email => @incoming_message.nil? ?
                    _("Then you can write follow up message to ") + @info_request.public_body.name + "." :
                    _("Then you can write your reply to ") + @info_request.public_body.name + ".",
                :email_subject => @incoming_message.nil? ?
                    _("Write your FOI follow up message to ") + @info_request.public_body.name :
                    _("Write a reply to ") + @info_request.public_body.name
            )
            return
        end

        if !params[:submitted_followup].nil? && !params[:reedit]
            if @info_request.allow_new_responses_from == 'nobody'
                flash[:error] = _('Your follow up has not been sent because this request has been stopped to prevent spam. Please <a href="%s">contact us</a> if you really want to send a follow up message.') % [help_contact_path]
            else
                if @info_request.find_existing_outgoing_message(params[:outgoing_message][:body])
                    flash[:error] = _('You previously submitted that exact follow up message for this request.')
                    render :action => 'show_response'
                    return
                end

                # See if values were valid or not
                @outgoing_message.info_request = @info_request
                if !@outgoing_message.valid?
                    render :action => 'show_response'
                    return
                end
                if params[:preview].to_i == 1
                    if @outgoing_message.what_doing == 'internal_review'
                        @internal_review = true
                    end
                    render :action => 'followup_preview'
                    return
                end

                # Send a follow up message
                @outgoing_message.send_message
                @outgoing_message.save!
                if @outgoing_message.what_doing == 'internal_review'
                    flash[:notice] = _("Your internal review request has been sent on its way.")
                else
                    flash[:notice] = _("Your follow up message has been sent on its way.")
                end
                redirect_to request_url(@info_request)
            end
        else
            # render default show_response template
        end
    end

    # Download an attachment

    before_filter :authenticate_attachment, :only => [ :get_attachment, :get_attachment_as_html ]
    def authenticate_attachment
        # Test for hidden
        incoming_message = IncomingMessage.find(params[:incoming_message_id])
        raise ActiveRecord::RecordNotFound.new("Message not found") if incoming_message.nil?
        if !incoming_message.info_request.user_can_view?(authenticated_user)
            @info_request = incoming_message.info_request # used by view
            render :template => 'request/hidden', :status => 410 # gone
        end
    end

    # special caching code so mime types are handled right
    around_filter :cache_attachments, :only => [ :get_attachment, :get_attachment_as_html ]
    def cache_attachments
        if !params[:skip_cache].nil?
            yield
        else
            key = params.merge(:only_path => true)
            key_path = foi_fragment_cache_path(key)
            if foi_fragment_cache_exists?(key_path)
                raise PermissionDenied.new("Directory listing not allowed") if File.directory?(key_path)
                cached = foi_fragment_cache_read(key_path)
                response.content_type = AlaveteliFileTypes.filename_to_mimetype(params[:file_name].join("/")) || 'application/octet-stream'
                render_for_text(cached)
                return
            end

            yield

            if params[:skip_cache].nil?
                # write it to the fileystem ourselves, so is just a plain file. (The
                # various fragment cache functions using Ruby Marshall to write the file
                # which adds a header, so isnt compatible with images that have been
                # extracted elsewhere from PDFs)
                foi_fragment_cache_write(key_path, response.body)
            end
        end
    end

    def get_attachment
        get_attachment_internal(false)

        # Prevent spam to magic request address. Note that the binary
        # subsitution method used depends on the content type
        @incoming_message.binary_mask_stuff!(@attachment.body, @attachment.content_type) 

        # we don't use @attachment.content_type here, as we want same mime type when cached in cache_attachments above
        response.content_type = AlaveteliFileTypes.filename_to_mimetype(params[:file_name].join("/")) || 'application/octet-stream'

        render :text => @attachment.body
    end

    def get_attachment_as_html
        get_attachment_internal(true)

        # images made during conversion (e.g. images in PDF files) are put in the cache directory, so
        # the same cache code in cache_attachments above will display them.
        key = params.merge(:only_path => true)
        key_path = foi_fragment_cache_path(key)
        image_dir = File.dirname(key_path)
        FileUtils.mkdir_p(image_dir)
        html, wrapper_id = @attachment.body_as_html(image_dir)

        view_html_stylesheet = render_to_string :partial => "request/view_html_stylesheet"
        html.sub!(/<head>/i, "<head>" + view_html_stylesheet)
        html.sub!(/<body[^>]*>/i, '<body><prefix-here><div id="' + wrapper_id + '"><div id="view-html-content">')
        html.sub!(/<\/body[^>]*>/i, '</div></div></body>')

        view_html_prefix = render_to_string :partial => "request/view_html_prefix"
        html.sub!("<prefix-here>", view_html_prefix)
        html.sub!("<attachment-url-here>", CGI.escape(@attachment_url))

        @incoming_message.html_mask_stuff!(html) 
        response.content_type = 'text/html'
        render :text => html
    end

    # Internal function
    def get_attachment_internal(html_conversion)
        @incoming_message = IncomingMessage.find(params[:incoming_message_id])
        @requested_request = InfoRequest.find(params[:id])
        @incoming_message.parse_raw_email!
        @info_request = @incoming_message.info_request
        if @incoming_message.info_request_id != params[:id].to_i
            message = "Incoming message %d does not belong to request %d" % [@incoming_message.info_request_id, params[:id]]
            raise ActiveRecord::RecordNotFound.new(message)
        end
        @part_number = params[:part].to_i
        @filename = params[:file_name].join("/")
        if html_conversion
            @original_filename = @filename.gsub(/\.html$/, "")
        else
            @original_filename = @filename
        end
       
        # check permissions
        raise "internal error, pre-auth filter should have caught this" if !@info_request.user_can_view?(authenticated_user)
        @attachment = IncomingMessage.get_attachment_by_url_part_number(@incoming_message.get_attachments_for_display, @part_number)
        raise ActiveRecord::RecordNotFound.new("attachment not found part number " + @part_number.to_s + " incoming_message " + @incoming_message.id.to_s) if @attachment.nil?

        # check filename in URL matches that in database (use a censor rule if you want to change a filename)
        raise ActiveRecord::RecordNotFound.new("please use same filename as original file has, display: '" + @attachment.display_filename + "' old_display: '" + @attachment.old_display_filename + "' original: '" + @original_filename + "'") if @attachment.display_filename != @original_filename && @attachment.old_display_filename != @original_filename

        @attachment_url = get_attachment_url(:id => @incoming_message.info_request_id,
                :incoming_message_id => @incoming_message.id, :part => @part_number,
                :file_name => @original_filename )
    end

    # FOI officers can upload a response
    def upload_response
        @locale = self.locale_from_params()
        PublicBody.with_locale(@locale) do 
            @info_request = InfoRequest.find_by_url_title(params[:url_title])

            @reason_params = {
                    :web => _("To upload a response, you must be logged in using an email address from ") +  CGI.escapeHTML(@info_request.public_body.name),
                    :email => _("Then you can upload an FOI response. "),
                    :email_subject => _("Confirm your account on {{site_name}}",:site_name=>site_name)
            }

            if !authenticated?(@reason_params)
                return
            end

            if !@info_request.public_body.is_foi_officer?(@user)
                domain_required = @info_request.public_body.foi_officer_domain_required
                if domain_required.nil?
                    render :template => 'user/wrong_user_unknown_email'
                    return
                end
                @reason_params[:user_name] = "an email @" + domain_required
                render :template => 'user/wrong_user'
                return
            end
        end
        if params[:submitted_upload_response]
            file_name = nil
            file_content = nil
            if !params[:file_1].nil?
                file_name = params[:file_1].original_filename
                file_content = params[:file_1].read
            end
            body = params[:body] || ""

            if file_name.nil? && body.empty?
                flash[:error] = _("Please type a message and/or choose a file containing your response.")
                return
            end

            mail = RequestMailer.create_fake_response(@info_request, @user, body, file_name, file_content)
            @info_request.receive(mail, mail.encoded, true)
            flash[:notice] = _("Thank you for responding to this FOI request! Your response has been published below, and a link to your response has been emailed to ") + CGI.escapeHTML(@info_request.user.name) + "."
            redirect_to request_url(@info_request)
            return
        end
    end

    # Type ahead search
    def search_typeahead
        # Since acts_as_xapian doesn't support the Partial match flag, we work around it
        # by making the last work a wildcard, which is quite the same
        query = params[:q]
        @xapian_requests = perform_search_typeahead(query, InfoRequestEvent)
        render :partial => "request/search_ahead.rhtml"
    end

    def download_entire_request
        @locale = self.locale_from_params()
        PublicBody.with_locale(@locale) do
            info_request = InfoRequest.find_by_url_title(params[:url_title])
            if info_request.nil?
                raise ActiveRecord::RecordNotFound.new("Request not found")
            end
            if authenticated?(
                              :web => _("To download the zip file"),
                              :email => _("Then you can download a zip file of {{info_request_title}}.",:info_request_title=>info_request.title),
                              :email_subject => _("Log in to download a zip file of {{info_request_title}}",:info_request_title=>info_request.title)
                              )
                updated = Digest::SHA1.hexdigest(info_request.get_last_event.created_at.to_i.to_s + info_request.updated_at.to_i.to_s)
                @url_path = "/download/#{updated[0..1]}/#{updated}/#{params[:url_title]}.zip"
                file_path = File.join(File.dirname(__FILE__), '../../cache/zips', @url_path)
                if !File.exists?(file_path) 
                    FileUtils.mkdir_p(File.dirname(file_path))
                    Zip::ZipFile.open(file_path, Zip::ZipFile::CREATE) { |zipfile|
                        convert_command = MySociety::Config.get("HTML_TO_PDF_COMMAND")
                        done = false
                        if File.exists?(convert_command)
                            domain = MySociety::Config.get("DOMAIN")
                            url = "http://#{domain}#{request_url(info_request)}?print_stylesheet=1"
                            tempfile = Tempfile.new('foihtml2pdf')
                            output = AlaveteliExternalCommand.run(convert_command, url, tempfile.path)
                            if !output.nil?
                                zipfile.get_output_stream("correspondence.pdf") { |f|
                                    f.puts(File.open(tempfile.path).read)
                                }
                                done = true
                            else
                                logger.error("Could not convert info request #{info_request.id} to PDF with command '#{convert_command} #{url} #{tempfile.path}'")
                            end
                            tempfile.close
                        else                    
                            logger.warn("No HTML -> PDF converter found at #{convert_command}")
                        end
                        if !done
                            @info_request = info_request
                            @info_request_events = info_request.info_request_events
                            template = File.read(File.join(File.dirname(__FILE__), "..", "views", "request", "simple_correspondence.rhtml"))
                            output = ERB.new(template).result(binding)
                            zipfile.get_output_stream("correspondence.txt") { |f|
                                f.puts(output)
                            }
                        end
                        for message in info_request.incoming_messages                
                            attachments = message.get_attachments_for_display
                            for attachment in attachments
                                filename = "#{attachment.url_part_number}_#{attachment.display_filename}"
                                zipfile.get_output_stream(filename) { |f|
                                    f.puts(attachment.body)
                                }
                            end
                        end
                    }
                    File.chmod(0644, file_path)
                end
                redirect_to @url_path
            end
        end
    end
end