require 'groonga'
require File.expand_path(File.dirname(__FILE__)) + '/groovy/model'

module Groovy

  class << self

    def contexts
      @contexts ||= {}
    end

    def [](key)
      contexts[key.to_sym]
    end
    
    def first_context_name
      contexts.keys.first
    end

    def open(db_path, name = :default, opts = {})
      raise "Context already defined: #{name}" if contexts[name.to_sym]
      contexts[name.to_sym] = if name == :default
        Groonga::Context.default.tap { |ctx| open_or_create_db(ctx, db_path) }
      else
        init_context(db_path, opts)
      end
    end

    def logger=(obj)
      @logger = obj
    end

    def logger
      @logger ||= Logger.new(STDOUT)
    end

    private

    def init_context(db_path, opts)
      Groonga::Context.new(opts).tap do |ctx|
        open_or_create_db(ctx, db_path)
      end
    end

    def open_or_create_db(ctx, path)
      if File.exist?(path)
        logger.info "Opening DB at #{path}"
        ctx.open_database(path)
      else
        dir = File.dirname(path)
        logger.info "Creating DB in #{dir}"
        FileUtils.mkdir_p(dir)
        ctx.create_database(path)
      end
    end

  end

end