namespace :db do
  desc "Migrate the database through scripts in db/migrate. Target specific version with VERSION=x"
  task :migrate => :environment do
    ActiveRecord::Migrator.migrate("db/migrate/", ENV["VERSION"] ? ENV["VERSION"].to_i : nil)
    Rake::Task["db:schema:dump"].invoke if ActiveRecord::Base.schema_format == :ruby
  end

  namespace :fixtures do
    desc "Load fixtures into the current environment's database"
    task :load => :environment do
      require 'active_record/fixtures'
      ActiveRecord::Base.establish_connection(RAILS_ENV.to_sym)
      Dir.glob(File.join(RAILS_ROOT, 'test', 'fixtures', '*.{yml,csv}')).each do |fixture_file|
        Fixtures.create_fixtures('test/fixtures', File.basename(fixture_file, '.*'))
      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 do
      require 'active_record/schema_dumper'
      File.open(ENV['SCHEMA'] || "db/schema.rb", "w") do |file|
        ActiveRecord::SchemaDumper.dump(ActiveRecord::Base.connection, file)
      end
    end

    desc "Load a schema.rb file into the database"
    task :load => :environment do
      file = ENV['SCHEMA'] || "db/schema.rb"
      load(file)
    end
  end

  namespace :structure do
    desc "Dump the database structure to a SQL file"
    task :dump => :environment do
      abcs = ActiveRecord::Base.configurations
      case abcs[RAILS_ENV]["adapter"] 
        when "mysql", "oci"
          ActiveRecord::Base.establish_connection(abcs[RAILS_ENV])
          File.open("db/#{RAILS_ENV}_structure.sql", "w+") { |f| f << ActiveRecord::Base.connection.structure_dump }
        when "postgresql"
          ENV['PGHOST']     = abcs[RAILS_ENV]["host"] if abcs[RAILS_ENV]["host"]
          ENV['PGPORT']     = abcs[RAILS_ENV]["port"].to_s if abcs[RAILS_ENV]["port"]
          ENV['PGPASSWORD'] = abcs[RAILS_ENV]["password"].to_s if abcs[RAILS_ENV]["password"]
          search_path = abcs[RAILS_ENV]["schema_search_path"]
          search_path = "--schema=#{search_path}" if search_path
          `pg_dump -i -U "#{abcs[RAILS_ENV]["username"]}" -s -x -O -f db/#{RAILS_ENV}_structure.sql #{search_path} #{abcs[RAILS_ENV]["database"]}`
        when "sqlite", "sqlite3"
          dbfile = abcs[RAILS_ENV]["database"] || abcs[RAILS_ENV]["dbfile"]
          `#{abcs[RAILS_ENV]["adapter"]} #{dbfile} .schema > db/#{RAILS_ENV}_structure.sql`
        when "sqlserver"
          `scptxfr /s #{abcs[RAILS_ENV]["host"]} /d #{abcs[RAILS_ENV]["database"]} /I /f db\\#{RAILS_ENV}_structure.sql /q /A /r`
          `scptxfr /s #{abcs[RAILS_ENV]["host"]} /d #{abcs[RAILS_ENV]["database"]} /I /F db\ /q /A /r`
        else 
          raise "Task not supported by '#{abcs["test"]["adapter"]}'"
      end

      if ActiveRecord::Base.connection.supports_migrations?
        File.open("db/#{RAILS_ENV}_structure.sql", "a") { |f| f << ActiveRecord::Base.connection.dump_schema_information }
      end
    end
  end

  namespace :test do
    desc "Recreate the test database from the current environment's database schema"
    task :clone => "db:schema:dump" do
      ActiveRecord::Base.establish_connection(ActiveRecord::Base.configurations['test'])
      ActiveRecord::Schema.verbose = false
      Rake::Task["db:schema:load"].invoke
    end

  
    desc "Recreate the test databases from the development structure"
    task :clone_structure => [ "db:structure:dump", "db:test:purge" ] do
      abcs = ActiveRecord::Base.configurations
      case abcs["test"]["adapter"]
        when "mysql"
          ActiveRecord::Base.establish_connection(:test)
          ActiveRecord::Base.connection.execute('SET foreign_key_checks = 0')
          IO.readlines("db/#{RAILS_ENV}_structure.sql").join.split("\n\n").each do |table|
            ActiveRecord::Base.connection.execute(table)
          end
        when "postgresql"
          ENV['PGHOST']     = abcs["test"]["host"] if abcs["test"]["host"]
          ENV['PGPORT']     = abcs["test"]["port"].to_s if abcs["test"]["port"]
          ENV['PGPASSWORD'] = abcs["test"]["password"].to_s if abcs["test"]["password"]
          `psql -U "#{abcs["test"]["username"]}" -f db/#{RAILS_ENV}_structure.sql #{abcs["test"]["database"]}`
        when "sqlite", "sqlite3"
          dbfile = abcs["test"]["database"] || abcs["test"]["dbfile"]
          `#{abcs["test"]["adapter"]} #{dbfile} < db/#{RAILS_ENV}_structure.sql`
        when "sqlserver"
          `osql -E -S #{abcs["test"]["host"]} -d #{abcs["test"]["database"]} -i db\\#{RAILS_ENV}_structure.sql`
        when "oci"
          ActiveRecord::Base.establish_connection(:test)
          IO.readlines("db/#{RAILS_ENV}_structure.sql").join.split(";\n\n").each do |ddl|
            ActiveRecord::Base.connection.execute(ddl)
          end
        else 
          raise "Task not supported by '#{abcs["test"]["adapter"]}'"
      end
    end

    desc "Empty the test database"
    task :purge => :environment do
      abcs = ActiveRecord::Base.configurations
      case abcs["test"]["adapter"]
        when "mysql"
          ActiveRecord::Base.establish_connection(:test)
          ActiveRecord::Base.connection.recreate_database(abcs["test"]["database"])
        when "postgresql"
          ENV['PGHOST']     = abcs["test"]["host"] if abcs["test"]["host"]
          ENV['PGPORT']     = abcs["test"]["port"].to_s if abcs["test"]["port"]
          ENV['PGPASSWORD'] = abcs["test"]["password"].to_s if abcs["test"]["password"]
          enc_option = "-E #{abcs["test"]["encoding"]}" if abcs["test"]["encoding"]
          `dropdb -U "#{abcs["test"]["username"]}" #{abcs["test"]["database"]}`
          `createdb #{enc_option} -U "#{abcs["test"]["username"]}" #{abcs["test"]["database"]}`
        when "sqlite","sqlite3"
          dbfile = abcs["test"]["database"] || abcs["test"]["dbfile"]
          File.delete(dbfile) if File.exist?(dbfile)
        when "sqlserver"
          dropfkscript = "#{abcs["test"]["host"]}.#{abcs["test"]["database"]}.DP1".gsub(/\\/,'-')
          `osql -E -S #{abcs["test"]["host"]} -d #{abcs["test"]["database"]} -i db\\#{dropfkscript}`
          `osql -E -S #{abcs["test"]["host"]} -d #{abcs["test"]["database"]} -i db\\#{RAILS_ENV}_structure.sql`
        when "oci"
          ActiveRecord::Base.establish_connection(:test)
          ActiveRecord::Base.connection.structure_drop.split(";\n\n").each do |ddl|
            ActiveRecord::Base.connection.execute(ddl)
          end
        else
          raise "Task not supported by '#{abcs["test"]["adapter"]}'"
      end
    end

    desc 'Prepare the test database and load the schema'
    task :prepare => :environment do
      Rake::Task[{ :sql  => "db:test:clone_structure", :ruby => "db:test:clone" }[ActiveRecord::Base.schema_format]].invoke
    end
  end

  namespace :sessions do
    desc "Creates a sessions table for use with CGI::Session::ActiveRecordStore"
    task :create => :environment do
      raise "Task unavailable to this database (no migration support)" unless ActiveRecord::Base.connection.supports_migrations?

      ActiveRecord::Base.connection.create_table(session_table_name) do |t|
        t.column :session_id, :string
        t.column :data, :text
        t.column :updated_at, :datetime
      end
  
      ActiveRecord::Base.connection.add_index(session_table_name, :session_id)
    end

    desc "Drop the sessions table"
    task :drop => :environment do
      raise "Task unavailable to this database (no migration support)" unless ActiveRecord::Base.connection.supports_migrations?
      ActiveRecord::Base.connection.drop_table(session_table_name)
    end

    desc "Drop and recreate the session table (much faster than 'DELETE * FROM sessions')"
    task :recreate => [ "db:sessions:drop", "db:sessions:create" ] do
    end
  end
end

def session_table_name
  ActiveRecord::Base.pluralize_table_names ? :sessions : :session
end