# == Schema Information
# Schema version: 52
#
# Table name: public_bodies
#
#  id                :integer         not null, primary key
#  name              :text            not null
#  short_name        :text            not null
#  request_email     :text            not null
#  version           :integer         not null
#  last_edit_editor  :string(255)     not null
#  last_edit_comment :text            not null
#  created_at        :datetime        not null
#  updated_at        :datetime        not null
#  url_name          :text            not null
#

# models/public_body.rb:
# A public body, from which information can be requested.
#
# Copyright (c) 2007 UK Citizens Online Democracy. All rights reserved.
# Email: francis@mysociety.org; WWW: http://www.mysociety.org/
#
# $Id: public_body.rb,v 1.67 2008-04-24 23:52:59 francis Exp $

require 'csv'
require 'set'

class PublicBody < ActiveRecord::Base
    validates_presence_of :name
    validates_presence_of :url_name

    validates_uniqueness_of :short_name, :if => Proc.new { |pb| pb.short_name != "" }
    validates_uniqueness_of :name
    
    has_many :info_requests, :order => 'created_at desc'
    has_many :public_body_tags

    def self.categories_with_description
        [
            [ "department", "Ministerial departments", "a ministerial department" ], 
            [ "local_council", "Local councils", "a local council" ], 
            [ "non_ministerial_department", "Non-ministerial departments", "a non-ministerial department" ], 
            [ "executive_agency", "Executive agencies", "an executive agency" ], 
            [ "npa", "National park authorities", "a national park authority" ], 
            [ "sea_fishery_committee", "Sea fisheries committees", "a sea fisheries committee" ], 
            [ "media", "Media", "a media organisation" ],
            [ "museum", "Museums and galleries", "a museum or gallery" ],
            [ "police", "Police forces", "a police force" ], 
            [ "rda", "Regional development agencies", "a regional development agency" ], 
            [ "sha", "Strategic health authorities", "a strategic health authority" ],
            [ "university", "Universities", "university" ], 
            [ "other", "Other", "other" ]
        ]
    end
    def self.categories
        self.categories_with_description.map() { |a| a[0] }
    end
    def self.categories_by_tag
        Hash[*self.categories_with_description.map() { |a| a[0..1] }.flatten]
    end
    def self.category_singular_by_tag
        Hash[*self.categories_with_description.map() { |a| [a[0],a[2]] }.flatten]
    end


    def validate
        # Request_email can be blank, meaning we don't have details
        if self.request_email != ""
            unless MySociety::Validate.is_valid_email(self.request_email)
                errors.add(:request_email, "doesn't look like a valid email address")
            end
        end
    end

    acts_as_versioned
    self.non_versioned_columns << 'created_at' << 'updated_at'
    class Version
        attr_accessor :created_at
    end

    acts_as_xapian :texts => [ :name, :short_name ],
        :values => [ [ :created_at, 0, "created_at", :date ] ],
        :terms => [ [ :variety, 'V', "variety" ] ]
    def variety
        "authority"
    end

    # When name or short name is changed, also change the url name
    def short_name=(short_name)
        write_attribute(:short_name, short_name)
        self.update_url_name
    end
    def name=(name)
        write_attribute(:name, name)
        self.update_url_name
    end
    def update_url_name
        url_name = MySociety::Format.simplify_url_part(self.short_or_long_name)
        write_attribute(:url_name, url_name)
    end
    # Return the short name if present, or else long name
    def short_or_long_name
        if self.short_name.nil? # can happen during construction
            self.name
        else
            self.short_name.empty? ? self.name : self.short_name
        end
    end

    # Given an input string of tags, sets all tags to that string
    def tag_string=(tag_string)
        tags = tag_string.split(/\s+/).uniq

        ActiveRecord::Base.transaction do
            for public_body_tag in self.public_body_tags
                public_body_tag.destroy
            end
            for tag in tags
                public_body_tag = PublicBodyTag.new(:name => tag)
                self.public_body_tags << public_body_tag
                public_body_tag.public_body = self
            end
        end
    end
    def tag_string
        return self.public_body_tags.map { |t| t.name }.join(' ')
    end

    # Find all public bodies with a particular tag
    def self.find_by_tag(tag) 
        return PublicBodyTag.find(:all, :conditions => ['name = ?', tag] ).map { |t| t.public_body }
    end

    # Use tags to describe what type of thing this is
    def type_of_authority
        types = []
        for tag in self.public_body_tags
            if PublicBody.categories_by_tag.include?(tag.name)
                types.push(PublicBody.category_singular_by_tag[tag.name])
            end
        end
        if types.size > 0
            types.join(", ")
        else
            return "a public authority"
        end
    end

    class ImportCSVDryRun < StandardError
    end

    # Import from CSV. Just tests things and returns messages if dry_run is true.
    # Returns an array of [array of errors, array of notes]. If there are errors,
    # always rolls back (as with dry_run).
    def self.import_csv(csv, tag, dry_run = false)
        errors = []
        notes = []

        begin
            ActiveRecord::Base.transaction do
                existing_bodies = PublicBody.find_by_tag(tag)

                bodies_by_name = {}
                set_of_existing = Set.new()
                for existing_body in existing_bodies
                    bodies_by_name[existing_body.name] = existing_body
                    set_of_existing.add(existing_body.name)
                end

                set_of_importing = Set.new()
                line = 0
                CSV::Reader.parse(csv) do |row|
                    line = line + 1

                    name = row[1]
                    email = row[2]
                    next if name.nil?
                    if email.nil?
                        email = '' # unknown/bad contact is empty string
                    end

                    name.strip!
                    email.strip!

                    if email != "" && !MySociety::Validate.is_valid_email(email)
                        errors.push "error: line " + line.to_s + ": invalid email " + email + " for authority '" + name + "'"
                        next
                    end

                    if bodies_by_name[name]
                        # Already have the public body, just update email
                        public_body = bodies_by_name[name]
                        if public_body.request_email != email
                            notes.push "line " + line.to_s + ": updating email for '" + name + "' from " + public_body.request_email + " to " + email
                            public_body.request_email = email
                            public_body.last_edit_editor = 'import_csv'
                            public_body.last_edit_comment = 'Updated from spreadsheet'
                            public_body.save!
                        end
                    else
                        # New public body
                        notes.push "line " + line.to_s + ": new authority '" + name + "' with email " + email
                        public_body = PublicBody.new(:name => name, :request_email => email, :short_name => "", :last_edit_editor => "import_csv", :last_edit_comment => 'Created from spreadsheet')
                        public_body.tag_string = tag
                        public_body.save!
                    end

                    set_of_importing.add(name)
                end

                # Give an error listing ones that are to be deleted 
                deleted_ones = set_of_existing - set_of_importing
                if deleted_ones.size > 0
                    notes.push "notes: Some " + tag + " bodies are in database, but not in CSV file:\n    " + Array(deleted_ones).join("\n    ") + "\nYou may want to delete them manually.\n"
                end

                # Rollback if a dry run, or we had errors
                if dry_run or errors.size > 0
                    raise ImportCSVDryRun
                end
            end
        rescue ImportCSVDryRun
            # Ignore
        end

        return [errors, notes]
    end

end