# -*- coding: UTF-8 -*-

require 'active_record'

module BuildTool

    class Setting < ActiveRecord::Base

        # Custom initialization
        after_initialize :my_initialize
        def my_initialize()
            @description = nil
            @default     = ""
            @seen = false
        end

        # The description for this setting
        attr_accessor :description

        # The default value for this setting
        attr_accessor :default

        # If the setting has been seen
        attr_accessor :seen

        def value()
            rv = read_attribute( :value )
            return @default if rv.nil?
            rv
        end

        def to_hash()
            return {
                :name => name,
                :value => value,
                :description => description }
        end

        class<<self

            def export( settings, only = [] )
                only = settings.keys if only.empty?
                values = []
                only.sort.each do |name|
                    # Skip internal settings.
                    next if name.start_with?( 'BUILD_TOOL.' )
                    # Check for unknown settings.
                    if not settings.has_key?( name )
                        logger.warn( 'Unknown setting %s skipped' % name )
                        next
                    end
                    s = settings[name]
                    values << s.to_hash()
                end
                return values
            end

            def import( settings, new )
                new.each do |v|
                    if not settings.has_key?( v[:name] )
                        logger.warn( 'Unknown setting %s skipped' % name )
                        next
                    end
                    s = settings[v[:name]]
                    if s.value != v[:value]
                        s.value = v[:value]
                        logger.info( 'Setting %s to "%s"' % [ s.name, s.value ] )
                        s.save!
                    end
                end
            end

        end

        # #name is in the database.
        validates_uniqueness_of :name

        def to_s()
            self.value.to_s
        end

    end # class Setting

end