require "drb/drb"
require "thread"
require "fileutils"
require "autospec/reload_css"
require "autospec/base_runner"
require "autospec/simple_runner"
require "autospec/spork_runner"

module Autospec; end

class Autospec::Runner
  MATCHERS = {}
  def self.watch(pattern, &blk)
    MATCHERS[pattern] = blk
  end

  watch(%r{^spec/.+_spec\.rb$})
  watch(%r{^lib/(.+)\.rb$})                           { |m| "spec/components/#{m[1]}_spec.rb" }

  # Rails example
  watch(%r{^app/(.+)\.rb$})                           { |m| "spec/#{m[1]}_spec.rb" }
  watch(%r{^app/(.*)(\.erb|\.haml)$})                 { |m| "spec/#{m[1]}#{m[2]}_spec.rb" }
  watch(%r{^app/controllers/(.+)_(controller)\.rb$})  { |m| "spec/#{m[2]}s/#{m[1]}_#{m[2]}_spec.rb" }
  watch(%r{^spec/support/(.+)\.rb$})                  { "spec" }
  watch("app/controllers/application_controller.rb")  { "spec/controllers" }

  # Capybara request specs
  watch(%r{^app/views/(.+)/.*\.(erb|haml)$})          { |m| "spec/requests/#{m[1]}_spec.rb" }

  # Fabrication
  watch(%r{^spec/fabricators/(.+)_fabricator\.rb$})   { "spec" }

  RELOAD_MATCHERS = Set.new
  def self.watch_reload(pattern)
    RELOAD_MATCHERS << pattern
  end

  watch_reload('spec/spec_helper.rb')
  watch_reload('config/(.*).rb')
  watch_reload(%r{app/helpers/(.*).rb})

  def self.run(opts={})
    self.new.run(opts)
  end

  def initialize
    @queue = []
    @mutex = Mutex.new
    @signal = ConditionVariable.new
    start_service_queue
  end

  def run(opts = {})

    puts "Forced polling (slower) - inotify does not work on network filesystems, use local filesystem to avoid" if opts[:force_polling]

    if ENV["SPORK"] == "0"
      puts "Using Simple Runner"
      @runner = Autospec::SimpleRunner.new
    else
      puts "Using Spork Runner"
      @runner = Autospec::SporkRunner.new
    end
    @runner.start

    Signal.trap("HUP") {@runner.stop; exit }
    Signal.trap("SIGINT") {@runner.stop; exit }

    options = {filter: /^app|^spec|^lib/, relative_paths: true}

    if opts[:force_polling]
      options[:force_polling] = true
      options[:latency] = opts[:latency] || 3
    end

    Thread.start do
      Listen.to('.', options ) do |modified, added, removed|
        process_change([modified, added].flatten.compact)
      end
    end

    @mutex.synchronize do
      @queue << ['spec', 'spec']
      @signal.signal
    end

    while @runner.running?
      process_queue
    end

  rescue => e
    puts e
    puts e.backtrace
    @runner.stop
  end

  def process_queue
    STDIN.gets

    if @queue.length == 0
      @queue << ['spec', 'spec']
      @signal.signal
    else
      specs = failed_specs(:delete => false)
      puts
      puts
      if specs.length == 0
        puts "No specs have failed yet!"
        puts
      else
        puts "The following specs have failed: "
        specs.each do |s|
          puts s
        end
        puts
        queue_specs(specs.zip specs)
      end
    end
  end

  def wait_for(timeout_milliseconds)
    timeout = (timeout_milliseconds + 0.0) / 1000
    finish = Time.now + timeout
    t = Thread.new do
      while Time.now < finish && !yield
        sleep(0.001)
      end
    end
    t.join rescue nil
  end

  def force_polling?
    works = false

    begin
      require 'rb-inotify'
      require 'fileutils'
      n = INotify::Notifier.new
      FileUtils.touch('./tmp/test_polling')

      n.watch("./tmp", :modify, :attrib){ works = true }
      quit = false
      Thread.new do
        while !works && !quit
          if IO.select([n.to_io], [], [], 0.1)
            n.process
          end
        end
      end
      sleep 0.01

      FileUtils.touch('./tmp/test_polling')
      wait_for(100) { works }
      File.unlink('./tmp/test_polling')
      n.stop
      quit = true
    rescue LoadError
      #assume it works (mac)
      works = true
    end

    !works
  end


  def process_change(files)
    return unless files.length > 0

    specs = []
    hit = false
    files.each do |file|
      RELOAD_MATCHERS.each do |k|
        if k.match(file)
          @runner.reload
          return
        end
      end
      MATCHERS.each do |k,v|
        if m = k.match(file)
          hit = true
          spec = v ? ( v.arity == 1 ? v.call(m) : v.call   ) : file
          if File.exists?(spec) || Dir.exists?(spec)
            specs << [file, spec]
          end
        end
      end
      Autospec::ReloadCss::MATCHERS.each do |k,v|
        matches = []
        if k.match(file)
          matches << file
        end
        Autospec::ReloadCss.run_on_change(matches) if matches.present?
      end
    end
    queue_specs(specs) if hit
  rescue => e
    p "failed in watcher"
    p e
    p e.backtrace
  end

  def queue_specs(specs)
    if specs.length == 0
      locked = @mutex.try_lock
      if locked
        @signal.signal
        @mutex.unlock
      end
      return
    else
      @runner.abort
    end

    @mutex.synchronize do
      specs.each do |c,spec|
        @queue.delete([c,spec])
        if @queue.last && @queue.last[0] == "focus"
          focus = @queue.pop
          @queue << [c,spec]
          if focus[1].include?(spec) || c != spec
            @queue << focus
          end
        else
          @queue << [c,spec]
        end
      end
      @signal.signal
    end
  end

  def thread_loop
    @mutex.synchronize do
      last_failed = false
      current = @queue.last
      if current
        last_failed = process_spec(current[1])
      end
      wait = @queue.length == 0 || last_failed
      @signal.wait(@mutex) if wait
    end
  rescue => e
    p "DISASTA PASTA"
    puts e
    puts e.backtrace
  end

  def process_spec(spec)
    last_failed = false
    result = run_spec(spec)
    if result == 0
      @queue.pop
    else
      last_failed = true
      if result.to_i > 0
        focus_on_failed_tests
        ensure_all_specs_will_run
      end
    end

    last_failed
  end

  def start_service_queue
    @worker ||= Thread.new do
      while true
        thread_loop
      end
    end
  end

  def focus_on_failed_tests
    current = @queue.last
    specs = failed_specs[0..10]
    if current[0] == "focus"
      @queue.pop
    end
    @queue << ["focus", specs.join(" ")]
  end

  def ensure_all_specs_will_run
    unless @queue.any?{|s,t| t == 'spec'}
      @queue.unshift(['spec','spec'])
    end
  end

  def failed_specs(opts={:delete => true})
    specs = []
    path = './tmp/rspec_result'
    if File.exist?(path)
      specs = File.open(path) { |file| file.read.split("\n") }
      File.delete(path) if opts[:delete]
    end

    specs
  end

  def run_spec(specs)
    File.delete("tmp/rspec_result") if File.exists?("tmp/rspec_result")
    args = ["-f", "progress", specs.split(" "),
            "-r", "#{File.dirname(__FILE__)}/formatter.rb",
            "-f", "Autospec::Formatter"].flatten

    @runner.run(args, specs)

  end


end