require 'optparse'
require 'tempfile'
require 'taps/monkey'
require 'taps/config'
require 'taps/log'
require 'vendor/okjson'

Taps::Config.taps_database_url = ENV['TAPS_DATABASE_URL'] || begin
  # this is dirty but it solves a weird problem where the tempfile disappears mid-process
  require 'sqlite3'
  $__taps_database = Tempfile.new('taps.db')
  $__taps_database.open()
  "sqlite://#{$__taps_database.path}"
end

module Taps
  class Cli
    attr_accessor :argv

    def initialize(argv)
      @argv = argv
    end

    def run
      method = (argv.shift || 'help').to_sym
      if [:pull, :push, :server, :version].include? method
        send(method)
      else
        help
      end
    end

    def pull
      opts = clientoptparse(:pull)
      Taps.log.level = Logger::DEBUG if opts[:debug]
      if opts[:resume_filename]
        clientresumexfer(:pull, opts)
      else
        clientxfer(:pull, opts)
      end
    end

    def push
      opts = clientoptparse(:push)
      Taps.log.level = Logger::DEBUG if opts[:debug]
      if opts[:resume_filename]
        clientresumexfer(:push, opts)
      else
        clientxfer(:push, opts)
      end
    end

    def server
      opts = serveroptparse
      Taps.log.level = Logger::DEBUG if opts[:debug]
      Taps::Config.database_url = opts[:database_url]
      Taps::Config.login = opts[:login]
      Taps::Config.password = opts[:password]

      Taps::Config.verify_database_url
      require 'taps/server'
      Taps::Server.run!({
        :port => opts[:port],
        :environment => :production,
        :logging => true,
        :dump_errors => true,
      })
    end

    def version
      puts Taps.version
    end

    def help
      puts <<EOHELP
  Options
  =======
  server    Start a taps database import/export server
  pull      Pull a database from a taps server
  push      Push a database to a taps server
  version   Taps version

  Add '-h' to any command to see their usage
  EOHELP
    end

    def serveroptparse
      opts={:port => 5000, :database_url => nil, :login => nil, :password => nil, :debug => false}
      OptionParser.new do |o|
        o.banner = "Usage: #{File.basename($0)} server [OPTIONS] <local_database_url> <login> <password>"
        o.define_head "Start a taps database import/export server"

        o.on("-p", "--port=N", "Server Port") { |v| opts[:port] = v.to_i if v.to_i > 0 }
        o.on("-d", "--debug", "Enable Debug Messages") { |v| opts[:debug] = true }
        o.parse!(argv)

        opts[:database_url] = argv.shift
        opts[:login] = argv.shift
        opts[:password] = argv.shift

        if opts[:database_url].nil?
          $stderr.puts "Missing Database URL"
          puts o
          exit 1
        end
        if opts[:login].nil?
          $stderr.puts "Missing Login"
          puts o
          exit 1
        end
        if opts[:password].nil?
          $stderr.puts "Missing Password"
          puts o
          exit 1
        end
      end
      opts
    end

    def clientoptparse(cmd)
      opts={:default_chunksize => 1000, :database_url => nil, :remote_url => nil, :debug => false, :resume_filename => nil, :disable_compresion => false, :indexes_first => false}
      OptionParser.new do |o|
        o.banner = "Usage: #{File.basename($0)} #{cmd} [OPTIONS] <local_database_url> <remote_url>"

        case cmd
        when :pull
          o.define_head "Pull a database from a taps server"
        when :push
          o.define_head "Push a database to a taps server"
        end

        o.on("-s", "--skip-schema", "Don't transfer the schema, just data") { |v| opts[:skip_schema] = true }
        o.on("-i", "--indexes-first", "Transfer indexes first before data") { |v| opts[:indexes_first] = true }
        o.on("-r", "--resume=file", "Resume a Taps Session from a stored file") { |v| opts[:resume_filename] = v }
        o.on("-c", "--chunksize=N", "Initial Chunksize") { |v| opts[:default_chunksize] = (v.to_i < 10 ? 10 : v.to_i) }
        o.on("-g", "--disable-compression", "Disable Compression") { |v| opts[:disable_compression] = true }
        o.on("-f", "--filter=regex", "Regex Filter for tables") { |v| opts[:table_filter] = v }
        o.on("-t", "--tables=A,B,C", Array, "Shortcut to filter on a list of tables") do |v|
          r_tables = v.collect { |t| "^#{t}$" }.join("|")
          opts[:table_filter] = "(#{r_tables})"
        end
        o.on("-e", "--exclude_tables=A,B,C", Array, "Shortcut to exclude a list of tables") { |v| opts[:exclude_tables] = v }
        o.on("-d", "--debug", "Enable Debug Messages") { |v| opts[:debug] = true }
        o.parse!(argv)

        opts[:database_url] = argv.shift
        opts[:remote_url] = argv.shift

        if opts[:database_url].nil?
          $stderr.puts "Missing Database URL"
          puts o
          exit 1
        end
        if opts[:remote_url].nil?
          $stderr.puts "Missing Remote Taps URL"
          puts o
          exit 1
        end
      end

      opts
    end

    def clientxfer(method, opts)
      database_url = opts.delete(:database_url)
      remote_url = opts.delete(:remote_url)

      Taps::Config.verify_database_url(database_url)

      require 'taps/operation'

      Taps::Operation.factory(method, database_url, remote_url, opts).run
    end

    def clientresumexfer(method, opts)
      session = ::OkJson.decode(File.read(opts.delete(:resume_filename)))
      session.symbolize_recursively!

      database_url = opts.delete(:database_url)
      remote_url = opts.delete(:remote_url) || session.delete(:remote_url)

      Taps::Config.verify_database_url(database_url)

      require 'taps/operation'

      newsession = session.merge({
        :default_chunksize => opts[:default_chunksize],
        :disable_compression => opts[:disable_compression],
        :resume => true,
      })

      Taps::Operation.factory(method, database_url, remote_url, newsession).run
    end

  end
end