#!/usr/bin/env ruby

require 'rubygems'
require 'optparse'
require 'sequel'

copy_databases = nil
dump_migration = nil
dump_schema = nil
env = nil
migrate_dir = nil
migrate_ver = nil
backtrace = nil
test = true
load_dirs = []
exclusive_options = []
loggers = []

opts = OptionParser.new do |opts|
  opts.banner = "Sequel: The Database Toolkit for Ruby"
  opts.define_head "Usage: sequel <uri|path> [options]"
  opts.separator ""
  opts.separator "Examples:"
  opts.separator "  sequel sqlite://blog.db"
  opts.separator "  sequel postgres://localhost/my_blog"
  opts.separator "  sequel config/database.yml"
  opts.separator ""
  opts.separator "For more information see http://sequel.rubyforge.org"
  opts.separator ""
  opts.separator "Options:"

  opts.on_tail("-h", "-?", "--help", "Show this message") do
    puts opts
    exit
  end

  opts.on("-C", "--copy-databases", "copy one database to another") do 
    copy_databases = true
  end
  
  opts.on("-d", "--dump-migration", "print database migration to STDOUT") do 
    dump_migration = true
    exclusive_options << :d
  end
  
  opts.on("-D", "--dump-migration-same-db", "print database migration to STDOUT without type translation") do
    dump_migration = :same_db
    exclusive_options << :D
  end

  opts.on("-e", "--env ENV", "use environment config for database") do |v|
    env = v
  end
  
  opts.on("-E", "--echo", "echo SQL statements") do
    require 'logger'
    loggers << Logger.new($stdout)
  end
  
  opts.on("-I", "--include dir", "specify $LOAD_PATH directory") do |v|
    $: << v
  end

  opts.on("-l", "--log logfile", "log SQL statements to log file") do |v|
    require 'logger'
    loggers << Logger.new(v)
  end
  
  opts.on("-L", "--load-dir DIR", "loads all *.rb under specifed directory") do |v|
    load_dirs << v
  end
  
  opts.on("-m", "--migrate-directory DIR", "run the migrations in directory") do |v|
    migrate_dir = v
    exclusive_options << :m
  end
  
  opts.on("-M", "--migrate-version VER", "migrate the database to version given") do |v|
    migrate_ver = Integer(v)
  end

  opts.on("-N", "--no-test-connection", "do not test the connection") do
    test = false
  end

  opts.on("-r", "--require lib", "require the library, before executing your script") do |v|
    load_dirs << [v]
  end

  opts.on("-S", "--dump-schema filename", "dump the schema for all tables to the file") do |v|
    dump_schema = v
    exclusive_options << :S
  end

  opts.on("-t", "--trace", "Output the full backtrace if an exception is raised") do
    backtrace = true
  end
  
  opts.on_tail("-v", "--version", "Show version") do
    puts "sequel #{Sequel.version}"
    exit
  end
end
opts.parse!

db = ARGV.shift

error_proc = lambda do |msg|
  $stderr.puts(msg)
  exit 1
end

error_proc["Error: Must specify -m if using -M"] if migrate_ver && !migrate_dir
error_proc["Error: Cannot specify #{exclusive_options.map{|v| "-#{v}"}.join(' and ')} together"] if exclusive_options.length > 1

connect_proc = lambda do |database|
  db = if database.nil? || database.empty?
    Sequel.connect('mock:///')
  elsif File.exist?(database)
    require 'yaml'
    env ||= "development"
    db_config = YAML.load_file(database)
    db_config = db_config[env] || db_config[env.to_sym] || db_config
    db_config.keys.each{|k| db_config[k.to_sym] = db_config.delete(k)}
    Sequel.connect(db_config)
  else
    Sequel.connect(database)
  end
  db.loggers = loggers
  db.test_connection if test
  db
end

begin
  DB = connect_proc[db]
  load_dirs.each{|d| d.is_a?(Array) ? require(d.first) : Dir["#{d}/**/*.rb"].each{|f| load(f)}}
  if migrate_dir
    Sequel.extension :migration
    Sequel::Migrator.apply(DB, migrate_dir, migrate_ver)
    exit
  end
  if dump_migration
    Sequel.extension :schema_dumper
    puts DB.dump_schema_migration(:same_db=>dump_migration==:same_db)
    exit
  end
  if dump_schema
    Sequel.extension :schema_caching
    DB.tables.each{|t| DB.schema(Sequel::SQL::Identifier.new(t))}
    DB.dump_schema_cache(dump_schema)
    exit
  end
  if copy_databases
    Sequel.extension :migration, :schema_dumper

    db2 = ARGV.shift
    error_proc["Error: Must specify database connection string or path to yaml file as second argument for database you want to copy to"] if db2.nil? || db2.empty?
    start_time = Time.now
    TO_DB = connect_proc[db2]
    same_db = DB.database_type==TO_DB.database_type
    index_opts = {:same_db=>same_db}
    index_opts[:index_names] = :namespace if !DB.global_index_namespace? && TO_DB.global_index_namespace?

    puts "Databases connections successful"
    schema_migration = eval(DB.dump_schema_migration(:indexes=>false, :same_db=>same_db))
    index_migration = eval(DB.dump_indexes_migration(index_opts))
    fk_migration = eval(DB.dump_foreign_key_migration(:same_db=>same_db))
    puts "Migrations dumped successfully"

    schema_migration.apply(TO_DB, :up)
    puts "Tables created"

    puts "Begin copying data"
    DB.transaction do
      TO_DB.transaction do
        DB.tables.each do |table|
          puts "Begin copying records for table: #{table}"
          time = Time.now
          to_ds = TO_DB.from(table)
          j = 0
          DB.from(table).each do |record|
            if Time.now - time > 5
              puts "Status: #{j} records copied" 
              time = Time.now
            end
            to_ds.insert(record)
            j += 1
          end
          puts "Finished copying #{j} records for table: #{table}"
        end
      end
    end
    puts "Finished copying data"

    puts "Begin creating indexes"
    index_migration.apply(TO_DB, :up)
    puts "Finished creating indexes"

    puts "Begin adding foreign key constraints"
    fk_migration.apply(TO_DB, :up)
    puts "Finished adding foreign key constraints"

    if TO_DB.database_type == :postgres
      TO_DB.tables.each{|t| TO_DB.reset_primary_key_sequence(t)}
      puts "Primary key sequences reset successfully"
    end
    puts "Database copy finished in #{Time.now - start_time} seconds"
    exit
  end
rescue => e
  raise e if backtrace
  error_proc["Error: #{e.class}: #{e.message}#{e.backtrace.first}"]
end

if !ARGV.empty? 
  ARGV.each{|v| load(v)}
elsif !$stdin.isatty
  eval($stdin.read)
else
  require 'irb'
  puts "Your database is stored in DB..."
  IRB.start
end
