require 'active_record'

db_namespace = namespace :db do

task :load_config do
  ActiveRecord::Base.configurations = ActiveRecord::Tasks::DatabaseTasks.database_configuration || {}
  ActiveRecord::Migrator.migrations_paths = ActiveRecord::Tasks::DatabaseTasks.migrations_paths
end

namespace :create do
  task :all => :load_config do
    ActiveRecord::Tasks::DatabaseTasks.create_all
  end
end

desc 'Create the database from DATABASE_URL or config/database.yml for the current Rails.env (use db:create:all to create all dbs in the config)'
task :create => [:load_config] do
  if ENV['DATABASE_URL']
    ActiveRecord::Tasks::DatabaseTasks.create_database_url
  else
    ActiveRecord::Tasks::DatabaseTasks.create_current
  end
end

namespace :drop do
  task :all => :load_config do
    ActiveRecord::Tasks::DatabaseTasks.drop_all
  end
end

desc 'Drops the database using DATABASE_URL or the current Rails.env (use db:drop:all to drop all databases)'
task :drop => [:load_config] do
  if ENV['DATABASE_URL']
    ActiveRecord::Tasks::DatabaseTasks.drop_database_url
  else
    ActiveRecord::Tasks::DatabaseTasks.drop_current
  end
end

desc "Migrate the database (options: VERSION=x, VERBOSE=false, SCOPE=blog)."
task :migrate => [:environment, :load_config] do
  ActiveRecord::Migration.verbose = ENV["VERBOSE"] ? ENV["VERBOSE"] == "true" : true
  ActiveRecord::Migrator.migrate(ActiveRecord::Migrator.migrations_paths, ENV["VERSION"] ? ENV["VERSION"].to_i : nil) do |migration|
    ENV["SCOPE"].blank? || (ENV["SCOPE"] == migration.scope)
  end
  db_namespace['_dump'].invoke
end

task :_dump do
  case ActiveRecord::Base.schema_format
  when :ruby then db_namespace["schema:dump"].invoke
  when :sql  then db_namespace["structure:dump"].invoke
  else
    raise "unknown schema format #{ActiveRecord::Base.schema_format}"
  end
  # Allow this task to be called as many times as required. An example is the
  # migrate:redo task, which calls other two internally that depend on this one.
  db_namespace['_dump'].reenable
end

namespace :migrate do
  # desc  'Rollbacks the database one migration and re migrate up (options: STEP=x, VERSION=x).'
  task :redo => [:environment, :load_config] do
    if ENV['VERSION']
      db_namespace['migrate:down'].invoke
      db_namespace['migrate:up'].invoke
    else
      db_namespace['rollback'].invoke
      db_namespace['migrate'].invoke
    end
  end

  # desc 'Resets your database using your migrations for the current environment'
  task :reset => ['db:drop', 'db:create', 'db:migrate']

  # desc 'Runs the "up" for a given migration VERSION.'
  task :up => [:environment, :load_config] do
    version = ENV['VERSION'] ? ENV['VERSION'].to_i : nil
    raise 'VERSION is required' unless version
    ActiveRecord::Migrator.run(:up, ActiveRecord::Migrator.migrations_paths, version)
    db_namespace['_dump'].invoke
  end

  # desc 'Runs the "down" for a given migration VERSION.'
  task :down => [:environment, :load_config] do
    version = ENV['VERSION'] ? ENV['VERSION'].to_i : nil
    raise 'VERSION is required' unless version
    ActiveRecord::Migrator.run(:down, ActiveRecord::Migrator.migrations_paths, version)
    db_namespace['_dump'].invoke
  end

  desc 'Display status of migrations'
  task :status => [:environment, :load_config] do
    unless ActiveRecord::Base.connection.table_exists?(ActiveRecord::Migrator.schema_migrations_table_name)
      puts 'Schema migrations table does not exist yet.'
      next  # means "return" for rake task
    end
    db_list = ActiveRecord::Base.connection.select_values("SELECT version FROM #{ActiveRecord::Migrator.schema_migrations_table_name}")
    db_list.map! { |version| "%.3d" % version }
    file_list = []
    ActiveRecord::Migrator.migrations_paths.each do |path|
      Dir.foreach(path) do |file|
        # match "20091231235959_some_name.rb" and "001_some_name.rb" pattern
        if match_data = /^(\d{3,})_(.+)\.rb$/.match(file)
          status = db_list.delete(match_data[1]) ? 'up' : 'down'
          file_list << [status, match_data[1], match_data[2].humanize]
        end
      end
    end
    db_list.map! do |version|
      ['up', version, '********** NO FILE **********']
    end
    # output
    puts "\ndatabase: #{ActiveRecord::Base.connection_config[:database]}\n\n"
    puts "#{'Status'.center(8)}  #{'Migration ID'.ljust(14)}  Migration Name"
    puts "-" * 50
    (db_list + file_list).sort_by {|migration| migration[1]}.each do |migration|
      puts "#{migration[0].center(8)}  #{migration[1].ljust(14)}  #{migration[2]}"
    end
    puts
  end
end

desc 'Rolls the schema back to the previous version (specify steps w/ STEP=n).'
task :rollback => [:environment, :load_config] do
  step = ENV['STEP'] ? ENV['STEP'].to_i : 1
  ActiveRecord::Migrator.rollback(ActiveRecord::Migrator.migrations_paths, step)
  db_namespace['_dump'].invoke
end

# desc 'Pushes the schema to the next version (specify steps w/ STEP=n).'
task :forward => [:environment, :load_config] do
  step = ENV['STEP'] ? ENV['STEP'].to_i : 1
  ActiveRecord::Migrator.forward(ActiveRecord::Migrator.migrations_paths, step)
  db_namespace['_dump'].invoke
end

# desc 'Drops and recreates the database from db/schema.rb for the current environment and loads the seeds.'
task :reset => [:environment, :load_config] do
  db_namespace["drop"].invoke
  db_namespace["setup"].invoke
end

# desc "Retrieves the charset for the current environment's database"
task :charset => [:environment, :load_config] do
  puts ActiveRecord::Tasks::DatabaseTasks.charset_current
end

# desc "Retrieves the collation for the current environment's database"
task :collation => [:environment, :load_config] do
  begin
    puts ActiveRecord::Tasks::DatabaseTasks.collation_current
  rescue NoMethodError
    $stderr.puts 'Sorry, your database adapter is not supported yet. Feel free to submit a patch.'
  end
end

desc 'Retrieves the current schema version number'
task :version => [:environment, :load_config] do
  puts "Current version: #{ActiveRecord::Migrator.current_version}"
end

# desc "Raises an error if there are pending migrations"
task :abort_if_pending_migrations => :environment do
  pending_migrations = ActiveRecord::Migrator.open(ActiveRecord::Migrator.migrations_paths).pending_migrations

  if pending_migrations.any?
    puts "You have #{pending_migrations.size} pending #{pending_migrations.size > 1 ? 'migrations:' : 'migration:'}"
    pending_migrations.each do |pending_migration|
      puts '  %4d %s' % [pending_migration.version, pending_migration.name]
    end
    abort %Q{Run `rake db:migrate` to update your database then try again.}
  end
end

desc 'Create the database, load the schema, and initialize with the seed data (use db:reset to also drop the db first)'
task :setup => ['db:schema:load_if_ruby', 'db:structure:load_if_sql', :seed]

desc 'Load the seed data from db/seeds.rb'
task :seed do
  db_namespace['abort_if_pending_migrations'].invoke
  ActiveRecord::Tasks::DatabaseTasks.load_seed
end

namespace :fixtures do
  desc "Load fixtures into the current environment's database. Load specific fixtures using FIXTURES=x,y. Load from subdirectory in test/fixtures using FIXTURES_DIR=z. Specify an alternative path (eg. spec/fixtures) using FIXTURES_PATH=spec/fixtures."
  task :load => [:environment, :load_config] do
    require 'active_record/fixtures'

    base_dir = if ENV['FIXTURES_PATH']
      STDERR.puts "Using FIXTURES_PATH env variable is deprecated, please use " +
                  "ActiveRecord::Tasks::DatabaseTasks.fixtures_path = '/path/to/fixtures' " +
                  "instead."
      File.join [Rails.root, ENV['FIXTURES_PATH'] || %w{test fixtures}].flatten
    else
      ActiveRecord::Tasks::DatabaseTasks.fixtures_path
    end

    fixtures_dir = File.join [base_dir, ENV['FIXTURES_DIR']].compact

    (ENV['FIXTURES'] ? ENV['FIXTURES'].split(/,/) : Dir["#{fixtures_dir}   /*.yml"].map {|f| f[(fixtures_dir.size + 1)..-5] }).each do |fixture_file|
      ActiveRecord::FixtureSet.create_fixtures(fixtures_dir, fixture_file)
    end
  end

  # desc "Search for a fixture given a LABEL or ID. Specify an alternative path (eg. spec/fixtures) using FIXTURES_PATH=spec/fixtures."
  task :identify => [:environment, :load_config] do
    require 'active_record/fixtures'

    label, id = ENV['LABEL'], ENV['ID']
    raise 'LABEL or ID required' if label.blank? && id.blank?

    puts %Q(The fixture ID for "#{label}" is #{ActiveRecord::FixtureSet.identify(label)}.) if label

    base_dir = if ENV['FIXTURES_PATH']
      STDERR.puts "Using FIXTURES_PATH env variable is deprecated, please use " +
                  "ActiveRecord::Tasks::DatabaseTasks.fixtures_path = '/path/to/fixtures' " +
                  "instead."
      File.join [Rails.root, ENV['FIXTURES_PATH'] || %w{test fixtures}].flatten
    else
      ActiveRecord::Tasks::DatabaseTasks.fixtures_path
    end

    Dir["#{base_dir}/   *.yml"].each do |file|
      if data = YAML::load(ERB.new(IO.read(file)).result)
        data.keys.each do |key|
          key_id = ActiveRecord::FixtureSet.identify(key)

          if key == label || key_id == id.to_i
            puts "#{file}: #{key} (#{key_id})"
          end
        end
      end
    end
  end
end

namespace :schema do
  desc 'Create a db/schema.rb file that can be portably used against any DB supported by AR'
  task :dump => [:environment, :load_config] do
    require 'active_record/schema_dumper'
    filename = ENV['SCHEMA'] || File.join(ActiveRecord::Tasks::DatabaseTasks.db_dir, 'schema.rb')
    File.open(filename, "w:utf-8") do |file|
      ActiveRecord::SchemaDumper.dump(ActiveRecord::Base.connection, file)
    end
    db_namespace['schema:dump'].reenable
  end

  desc 'Load a schema.rb file into the database'
  task :load => [:environment, :load_config] do
    file = ENV['SCHEMA'] || File.join(ActiveRecord::Tasks::DatabaseTasks.db_dir, 'schema.rb')
    if File.exists?(file)
      load(file)
    else
      abort %Q{#{file} doesn't exist yet. Run `rake db:migrate` to create it, then try again. If you do not intend to use a database, you should instead alter #{Rails.root}/config/application.rb to limit the frameworks that will be loaded.}
    end
  end

  task :load_if_ruby => ['db:create', :environment] do
    db_namespace["schema:load"].invoke if ActiveRecord::Base.schema_format == :ruby
  end

  namespace :cache do
    desc 'Create a db/schema_cache.dump file.'
    task :dump => [:environment, :load_config] do
      con = ActiveRecord::Base.connection
      filename = File.join(ActiveRecord::Tasks::DatabaseTasks.db_dir, "schema_cache.dump")

      con.schema_cache.clear!
      con.tables.each { |table| con.schema_cache.add(table) }
      open(filename, 'wb') { |f| f.write(Marshal.dump(con.schema_cache)) }
    end

    desc 'Clear a db/schema_cache.dump file.'
    task :clear => [:environment, :load_config] do
      filename = File.join(ActiveRecord::Tasks::DatabaseTasks.db_dir, "schema_cache.dump")
      FileUtils.rm(filename) if File.exists?(filename)
    end
  end

end

namespace :structure do
  desc 'Dump the database structure to db/structure.sql. Specify another file with DB_STRUCTURE=db/my_structure.sql'
  task :dump => [:environment, :load_config] do
    filename = ENV['DB_STRUCTURE'] || File.join(ActiveRecord::Tasks::DatabaseTasks.db_dir, "structure.sql")
    current_config = ActiveRecord::Tasks::DatabaseTasks.current_config
    ActiveRecord::Tasks::DatabaseTasks.structure_dump(current_config, filename)

    if ActiveRecord::Base.connection.supports_migrations?
      File.open(filename, "a") do |f|
        f.puts ActiveRecord::Base.connection.dump_schema_information
      end
    end
    db_namespace['structure:dump'].reenable
  end

  # desc "Recreate the databases from the structure.sql file"
  task :load => [:environment, :load_config] do
    filename = ENV['DB_STRUCTURE'] || File.join(ActiveRecord::Tasks::DatabaseTasks.db_dir, "structure.sql")
    current_config = ActiveRecord::Tasks::DatabaseTasks.current_config
    ActiveRecord::Tasks::DatabaseTasks.structure_load(current_config, filename)
  end

  task :load_if_sql => ['db:create', :environment] do
    db_namespace["structure:load"].invoke if ActiveRecord::Base.schema_format == :sql
  end
end

namespace :test do

  # desc "Recreate the test database from the current schema"
  task :load => 'db:test:purge' do
    case ActiveRecord::Base.schema_format
      when :ruby
        db_namespace["test:load_schema"].invoke
      when :sql
        db_namespace["test:load_structure"].invoke
    end
  end

  # desc "Recreate the test database from an existent schema.rb file"
  task :load_schema => 'db:test:purge' do
    begin
      should_reconnect = ActiveRecord::Base.connection_pool.active_connection?
      ActiveRecord::Base.establish_connection(ActiveRecord::Base.configurations['test'])
      ActiveRecord::Schema.verbose = false
      db_namespace["schema:load"].invoke
    ensure
      if should_reconnect
        ActiveRecord::Base.establish_connection(ActiveRecord::Base.configurations[ActiveRecord::Tasks::DatabaseTasks.env])
      end
    end
  end

  # desc "Recreate the test database from an existent structure.sql file"
  task :load_structure => 'db:test:purge' do
    begin
      ActiveRecord::Tasks::DatabaseTasks.current_config(:config => ActiveRecord::Base.configurations['test'])
      db_namespace["structure:load"].invoke
    ensure
      ActiveRecord::Tasks::DatabaseTasks.current_config(:config => nil)
    end
  end

  # desc "Recreate the test database from a fresh schema"
  task :clone do
    case ActiveRecord::Base.schema_format
      when :ruby
        db_namespace["test:clone_schema"].invoke
      when :sql
        db_namespace["test:clone_structure"].invoke
    end
  end

  # desc "Recreate the test database from a fresh schema.rb file"
  task :clone_schema => ["db:schema:dump", "db:test:load_schema"]

  # desc "Recreate the test database from a fresh structure.sql file"
  task :clone_structure => [ "db:structure:dump", "db:test:load_structure" ]

  # desc "Empty the test database"
  task :purge => [:environment, :load_config] do
    ActiveRecord::Tasks::DatabaseTasks.purge ActiveRecord::Base.configurations['test']
  end

  # desc 'Check for pending migrations and load the test schema'
  task :prepare => :load_config do
    unless ActiveRecord::Base.configurations.blank?
      db_namespace['test:load'].invoke
    end
  end
end

end

namespace :railties do

namespace :install do
  # desc "Copies missing migrations from Railties (e.g. engines). You can specify Railties to use with FROM=railtie1,railtie2"
  task :migrations => :'db:load_config' do
    to_load = ENV['FROM'].blank? ? :all : ENV['FROM'].split(",").map {|n| n.strip }
    railties = {}
    Rails.application.railties.each do |railtie|
      next unless to_load == :all || to_load.include?(railtie.railtie_name)

      if railtie.respond_to?(:paths) && (path = railtie.paths['db/migrate'].first)
        railties[railtie.railtie_name] = path
      end
    end

    on_skip = Proc.new do |name, migration|
      puts "NOTE: Migration #{migration.basename} from #{name} has been skipped. Migration with the same name already exists."
    end

    on_copy = Proc.new do |name, migration|
      puts "Copied migration #{migration.basename} from #{name}"
    end

    ActiveRecord::Migration.copy(ActiveRecord::Migrator.migrations_paths.first, railties,
                                  :on_skip => on_skip, :on_copy => on_copy)
  end
end

end

task 'test:prepare' => ['db:test:prepare', 'db:test:load', 'db:abort_if_pending_migrations']