require 'rubygems'
require 'restclient'
require 'json'

module CouchDocs
  class Store
    include Enumerable

    attr_accessor :url

    # Initialize a CouchDB store object.  Requires a URL for the
    # target CouchDB database.
    #
    def initialize(url)
      @url = url
    end

    # Loads all supplied design documents in the current store.
    # Given a hash <tt>h</tt>, the keys being the CouchDB document
    # name and values of design documents
    #
    def put_design_documents(h)
      h.each_pair do |document_name, doc|
        Store.put!("#{url}/_design/#{document_name}", doc)
      end
    end

    # Create or replace the document located at <tt>path</tt> with the
    # Hash document <tt>doc</tt>
    #
    def self.put!(path, doc)
      self.put(path, doc)
    rescue RestClient::RequestFailed
      self.delete_and_put(path, doc)
    end

    def self.delete_and_put(path, doc)
      self.delete(path)
      self.put(path, doc)
    end

    def self.put(path, doc)
      RestClient.put path,
        doc.to_json,
        :content_type => 'application/json'
    end

    def self.delete(path)
      # retrieve existing to obtain the revision
      old = self.get(path)
      RestClient.delete(path + "?rev=#{old['_rev']}")
    end

    def self.get(path)
      JSON.parse(RestClient.get(path))
    end

    def each
      Store.get("#{url}/_all_docs")['rows'].each do |rec|
        yield Store.get("#{url}/#{rec['id']}")
      end
    end
  end
end