module Oxidized
class SQL < Source
  begin
    require 'sequel'
  rescue LoadError
    raise OxidizedError, 'sequel not found: sudo gem install sequel'
  end

  def setup
    if @cfg.empty?
      Oxidized.asetus.user.source.sql.adapter   = 'sqlite'
      Oxidized.asetus.user.source.sql.database  = File.join(Config::Root, 'sqlite.db')
      Oxidized.asetus.user.source.sql.table     = 'devices'
      Oxidized.asetus.user.source.sql.map.name  = 'name'
      Oxidized.asetus.user.source.sql.map.model = 'rancid'
      Oxidized.asetus.save :user
      raise NoConfig, 'no source sql config, edit ~/.config/oxidized/config'
    end
  end

  def load node_want=nil
    nodes = []
    db = connect
    query = db[@cfg.table.to_sym]
    query = query.with_sql(@cfg.query) if @cfg.query?

    if node_want
      query = query.where(@cfg.map.name.to_sym=>node_want)
    end

    query.each do |node|
      # map node parameters
      keys = {}
      @cfg.map.each { |key, sql_column| keys[key.to_sym] = node_var_interpolate node[sql_column.to_sym] }
      keys[:model] = map_model keys[:model] if keys.key? :model

      # map node specific vars
      vars = {}
      @cfg.vars_map.each do |key, sql_column|
        vars[key.to_sym] = node_var_interpolate node[sql_column.to_sym]
      end
      keys[:vars] = vars unless vars.empty?

      nodes << keys
    end
    db.disconnect
    nodes
  end

  private

  def initialize
    super
    @cfg = Oxidized.config.source.sql
  end

  def connect
    Sequel.connect(:adapter  => @cfg.adapter,
                   :host     => @cfg.host?,
                   :user     => @cfg.user?,
                   :password => @cfg.password?,
                   :database => @cfg.database)
  rescue Sequel::AdapterNotFound => error
    raise OxidizedError, "SQL adapter gem not installed: " + error.message
  end

end
end