#!/usr/bin/env ruby

require 'optparse'
require 'ostruct'

RUBY_VERSIONS = %W[1.8.7 1.9.2]
RAILS_VERSIONS = %W[2.3 3.0 3.1 3.2]
DB_ADAPTERS = %W[postgresql mysql mysql2 sqlite3]

o = OpenStruct.new
o.ruby_versions = RUBY_VERSIONS
o.rails_versions = RAILS_VERSIONS
o.db_adapters = DB_ADAPTERS - ["mysql"]

OptionParser.new do |opts|
    opts.banner = "Usage: #{$0} [options]"

    opts.on("-n", "--dry-run", "Do a dry run without executing actions") do |v|
        o.dry_run = true
    end

    opts.on("--update", "Update gem dependencies") do |v|
        o.update = v
    end

    opts.on("--install", "Install gem dependencies") do |v|
        o.install = v
    end

    opts.on("--db adapter", String, "Choose which db adapter(s) to run. Default is: #{o.db_adapters.join(' ')}" ) do |adapter|
        o.db_adapters = adapter.split
    end

    opts.on("--ruby version", String, "Choose which version(s) of ruby to run.  Default is: #{o.ruby_versions.join(' ')}") do |ruby|
        o.ruby_versions = ruby.split(' ')
    end

    opts.on("--rails version", String, "Choose which version(s) of rails to run.  Default is: #{o.rails_versions.join(' ')}") do |rails|
        o.rails_versions = rails.split(' ')
    end

    opts.on("--full", "run complete matrix of ruby, rails, and db") do
      o.ruby_versions  = RUBY_VERSIONS
      o.rails_versions = RAILS_VERSIONS
      o.db_adapters = DB_ADAPTERS
    end

    opts.on("--quick", "quick run on Postgres, ruby #{RUBY_VERSIONS.last} and rails #{RAILS_VERSIONS.last}") do
      o.ruby_versions  = [RUBY_VERSIONS.last]
      o.rails_versions = [RAILS_VERSIONS.last]
      o.db_adapters = ["postgresql"]
    end

end.parse!


Combo = Struct.new(:ruby, :rails, :db_adapter)


if o.update or o.install
    o.db_adapters = [nil]
end

combos = o.ruby_versions.product(o.rails_versions, o.db_adapters).map{|product| Combo.new(*product)}.select {|combo|
    case
    when combo.rails >= "3.2" && combo.ruby <= "1.8.7" then false
    else true
    end
}


GEMFILES_DIR = File.expand_path('../gemfiles', __FILE__)
errs = []
combos.each_with_index do |combo, n|
    ruby = combo.ruby
    rails = combo.rails
    db_adapter = combo.db_adapter

    cmd = case
          when o.update
              "bundle update"
          when o.install
              "bundle install"
          else
              "bundle exec rake #{db_adapter}:spec"
          end

    command = %Q{BUNDLE_GEMFILE="#{File.join(GEMFILES_DIR, "Gemfile.rails-#{rails}")}" rvm #{ruby} do #{cmd}}

    puts "\n\n*** ruby version #{ruby} - rails version #{rails} - db adapter: #{db_adapter}  [#{n+1} of #{combos.size}]\n\n#{command}"

    next if o.dry_run
    system(command) or errs << "ruby #{ruby}, rails #{rails}#{db_adapter && ", db_adapter #{db_adapter}"}"
end
puts errs.any? ?  "\n*** #{errs.size} failures:\n\t#{errs.join("\n\t")}" : "\n*** #{combos.size > 1 ? 'all versions' : 'spec'} succeeded ***" unless o.dry_run