require 'active_support'
require 'uri'

module Provisional
  class Project
    attr_reader :options
    
    def initialize(options)
      @options = options

      unless is_valid_url?(@options[:template])
        if File.exist?(File.expand_path(@options[:template]))
          @options[:template_path] = File.expand_path(@options[:template])
        else
          @options[:template_path] = File.expand_path(File.join(File.dirname(__FILE__),'templates',"#{@options[:template]}.rb"))
        end
        raise ArgumentError, "is not valid: #{@options[:template]}" unless File.exist?(@options[:template_path])
      else
        @options[:template_path] = @options[:template]
      end

      raise ArgumentError, "must be specified" unless @options[:name]
      raise ArgumentError, "already exists: #{@options[:name]}" if File.exist?(@options[:name])
      raise ArgumentError, "already exists: #{@options[:name]}.repo" if @options[:scm] == 'svn' && File.exist?("#{@options[:name]}.repo")

      begin
        require "provisional/scm/#{@options[:scm]}"
      rescue MissingSourceFile
        raise ArgumentError, "is not supported: #{@options[:scm]}"
      end

      raise ArgumentError, "must be specified" if @options[:rails].to_s.empty?
      raise ArgumentError, "is not valid: #{@options[:rails]}" unless File.exist?(@options[:rails]) && File.executable?(@options[:rails])

      scm_class = "Provisional::SCM::#{@options[:scm].classify}".constantize
      scm = scm_class.new(@options)
      scm.init
      scm.generate_rails
      scm.checkin
    end

    def is_valid_url?(url)
      begin
        [URI::HTTP, URI::HTTPS].include?(URI.parse(url).class)
      rescue URI::InvalidURIError
        false
      end
    end

  end
end