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require 'elasticsearch'
require 'date'

module Ag::Storage
  module_function
  def create_index(list)
    begin
      $es.indices.delete index: 'ml-' + list
    rescue Elasticsearch::Transport::Transport::Errors::NotFound => e
      $stderr.puts "Index did not exist yet. Creating."
    end

    $es.indices.create(
      index: 'ml-' + list,
      body: {
        mappings: {
          message: {
            properties: {
              attachments: {
                properties: {
                  filename: {
                    type: 'string',
                    index: 'not_analyzed'
                  },
                  mime: {
                    type: 'string',
                    index: 'not_analyzed'
                  }
                }
              },
              cc: {
                type: 'string'
              },
              content: {
                type: 'string'
              },
              date: {
                type: 'date',
                format: 'dateOptionalTime'
              },
              from: {
                type: 'string'
              },
              from_realname: {
                type: 'string'
              },
              month: {
                type: 'integer'
              },
              parent: {
                type: 'string',
                index: 'not_analyzed'
              },
              raw_message_id: {
                type: 'string',
                index: 'not_analyzed'
              },
              raw_filename: {
                type: 'string',
                index: 'not_analyzed'
              },
              raw_parent: {
                type: 'string'
              },
              subject: {
                type: 'string'
              },
              to: {
                type: 'string'
              }
            }
          }
        }
      })

    # Give elasticsearch some time to process the new index
    sleep 1
  end

  def get_content(message, filename)
    content = 'Cannot parse MIME/contents.'
    begin
      raw_content = Ag::Rendering::HTMLizer.HTMLize(message)
      content = Ag::Utils.fix_encoding(raw_content || '', true).strip

      if content == ''
        $stderr.puts "#{message.message_id}: Content empty?"
      end
    rescue => e
      $stderr.puts "Cannot render message #{message.message_id} (file: #{filename}): #{e}"
    end

    content
  end

  def resolve_message_id(list, message_id = nil)
    return nil if message_id == nil

    result = $es.search(
      index: 'ml-' + list,
      body: {
        query: {
          filtered: {
            filter: {
              term: { raw_message_id: message_id }
            }
          }
        },
        fields: ['_id']
      }
    )

    return nil if result['hits']['total'] == 0

    result['hits']['hits'].first['_id']
  end

  def store(list, message, filename)
    content = get_content(message)

    identifier = message['X-Archives-Hash'].value
    raw_parent = Ag::Threading.get_parent_message_id(message)

    from = Ag::Utils.fix_encoding(message[:from].formatted.first)
    from_realname = from.gsub(/<(.*)>/, '').strip

    to = ''
    if message[:to]
      to = Ag::Utils.fix_encoding(message[:to].formatted.join(','))
    end

    cc = ''
    if message[:cc]
      cc = Ag::Utils.fix_encoding(message[:cc].formatted.join(','))
    end

    subject = Ag::Utils.fix_encoding(message.subject)

    attachments = []
    if message.has_attachments?
      message.attachments.each do |attachment|
        attachments << {
          filename: attachment.filename,
          mime: attachment.mime_type
        }
      end
    end

    $es.index(
      index: 'ml-' + list,
      type: 'message',
      id: identifier,
      body: {
        raw_message_id: message.message_id,
        subject: subject,
        to: to,
        cc: cc,
        from: from,
        from_realname: from_realname,
        date: message.date,
        month: ("%i%02i" % [message.date.year, message.date.month]).to_i, # this is a sortable number!
        content: content,
        attachments: attachments,
        raw_parent: raw_parent,
        raw_filename: filename
      }
    )
  end

  def fix_threading(list)
    result = $es.search(
      index: 'ml-' + list,
      size: 100000,
      body: {
        size: 100000,
        query: {
          filtered: {
            filter: {
              and: [
                {
                  missing: {
                    field: 'parent'
                  }
                },
                {
                  exists: {
                    field: 'raw_parent'
                  }
                }
              ]
            }
          }
        }
      }
    )

    result['hits']['hits'].each do |hit|
      msg = resolve_message_id(list, hit['_source']['raw_parent'])

      unless msg == nil
        $es.update(
          index: 'ml-' + list,
          type: 'message',
          id: hit['_id'],
          body: {
            doc: {
              parent: msg
            }
          }
        )
      end
    end

    result['hits']['total']
  end
end