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#!/usr/bin/env ruby

require 'rbconfig'
require 'tempfile'

root = File.expand_path File.dirname(__FILE__)

require File.join(root, "kernel", "delta", "options")

class Configure

  def initialize(root)
    @defines = []
    @config = File.join(root, "config.rb")

    # LLVM settings
    @llvm = :no
    @llvm_path = nil
    @llvm_configure = nil
    @llvm_svn_dir = File.join(root, "vm", "external_libs", "llvm")

    # File system paths
    @bindir = root + "/bin"
    @includedir = root + "/vm/capi"
    @libdir = root
    @runtime = @libdir + "/runtime"
    @lib_path = @libdir + "/lib"
    @ext_path = @libdir + "/lib/ext"
    @mandir = root + "/man"
    @gemsdir = root + "/gems"
    @program_name = "rbx"

    # Essential settings (modify these for creating releases)
    @libversion = "1.0"
    @version = "#{@libversion}.0-rc2"
    @release_date = "2010-01-04"
    @config_version = 1

    if File.directory? root + "/.git"
      @buildrev = `git rev-list --all | head -n1`.chomp
    else
      @buildrev = "release"
    end

    # TODO: conditionalize for Windows
    @host = `./rakelib/config.guess`.chomp
    /([^-]+)-([^-]+)-(.*)/ =~ @host
    @cpu, @vendor, @os = $1, $2, $3

    # TODO: add conditionals for platforms
    if Config::CONFIG["build_os"] =~ /darwin/
      @ldshared = "cc -dynamic -bundle -undefined suppress -flat_namespace"
    else
      @ldshared = "cc -shared"
    end
  end

  def options
    o = Rubinius::Options.new "Usage: configure [options]", 30
    o.left_align

    o.doc " LLVM settings"

    @use_llvm = true

    o.on "--disable-llvm", "Don't build with LLVM" do
      @use_llvm = false
    end

    o.on "--enable-llvm", "Enable llvm (default)" do
      # noop
    end

    @skip_system = false
    o.on "--skip-system", "Don't consider a system LLVM installation" do
      @skip_system = true
    end

    o.on "--llvm-path", "PATH", "Where to find LLVM" do |dir|
      @llvm_path = dir
    end

    o.on "--update-prebuilt", "Update prebuilt LLVM packages from the internet" do
      update_prebuilt
    end

    o.doc "\n File system paths for installing Rubinius"

    o.on "-P", "--prefix", "PATH", "Install Rubinius in subdirectories of PATH" do |dir|
      dir = File.expand_path dir

      if File.directory? dir and dir !~ /(rubinius|rbx)\/?$/
        puts "The directory #{dir} already exists, installing to #{dir}/rubinius"
        dir += "/rubinius"
      end

      @bindir = dir + "/bin"
      @includedir = dir + "/include"
      @libdir = dir
      @runtime = @libdir + "/runtime"
      @lib_path = @libdir + "/lib"
      @ext_path = @libdir + "/lib/ext"
      @mandir = dir + "/man"
      @gemsdir = dir + "/gems"
    end

    o.on "-B", "--bindir", "PATH", "Install Rubinius executable in PATH" do |dir|
      @bindir = dir
    end

    o.on "-I", "--includedir", "PATH", "Install Rubinius C-API include files in PATH" do |dir|
      @includedir = dir
    end

    o.on "-L", "--libdir", "PATH", "Install Ruby library in PATH" do |dir|
      @libdir = dir + "/rubinius/#{@libversion}"
      @runtime = @libdir + "/runtime"
      @lib_path = @libdir + "/lib"
      @ext_path = @libdir + "/lib/ext"
    end

    o.on "-M", "--mandir", "PATH", "Install man pages in PATH" do |dir|
      @mandir = dir
    end

    o.on "-G", "--gemsdir", "PATH", "Install gems in PATH" do |dir|
      @gemsdir = dir
    end

    o.doc "\n Help!"

    o.on "--show", "Print the current configuration and exit" do
      print_debug
      exit 0
    end

    o.on "-V", "--verbose", "Print additional info" do
      @verbose = true
    end

    o.help

    o.doc ""

    @options = o
  end

  def parse(ary)
    @options.parse ary
  end

  require 'net/http'

  def download(url, full_path)
    begin

     if ENV['http_proxy']
        protocol, userinfo, host, port = URI::split(ENV['http_proxy'])
        proxy_user, proxy_pass = userinfo.split(/:/) if userinfo
        http = Net::HTTP::Proxy(host, port, proxy_user, proxy_pass)
      else
        http = Net::HTTP
      end

      http.get_response(URI(url)) do |res|
        size, total = 0, res.header['Content-Length'].to_i
        File.open full_path, "w" do |f|
          res.read_body do |chunk|
            f << chunk
            size += chunk.size
            print "\r [ %d%% (%d of %d) ]" % [(size * 100) / total, size, total]
          end
        end
        puts ": done!"
      end
    rescue Exception => e
      File.unlink full_path if File.exists?(full_path)
      puts " ERROR"
      return false
    end

    return true
  end

  def update_prebuilt
    file = "llvm-#{@host}.tar.bz2"
    full_path = "vm/external_libs/prebuilt/#{file}"

    dir = File.dirname full_path

    Dir.mkdir dir unless File.exists? dir

    url = "http://asset.rubini.us/prebuilt/#{file}"

    unless File.exists?(full_path)
      download url, full_path

      unless File.exists? full_path
        puts "ERROR. No #{file} available on server."
        return false
      end
    end

    puts " Prebuilt packages updated."
  end

  def setup_source
    url = "http://asset.rubini.us/prebuilt/llvm-2.6-source.tar.bz2"
    path = "vm/external_libs/prebuilt/llvm-2.6-source.tar.bz2"

    puts " Downloading #{url}..."
    return false unless download(url, path)

    if File.exists?(path)
      print " Unpacking prebuilt LLVM source: "
      system "cd vm/external_libs; tar xjf prebuilt/llvm-2.6-source.tar.bz2"
      puts "done!"

      if File.exists?("vm/external_libs/llvm/include")
        puts " Code appears to be proper svn tree."
      else
        puts " Code doesn't appear to be proper LLVM tree!"
        return false
      end

      @llvm = :svn
      return true
    end

  end

  def setup_prebuilt
    puts " Checking for prebuilt LLVM build..."
    file = "vm/external_libs/prebuilt/llvm-#{@host}.tar.bz2"

    update_prebuilt unless File.exists?(file)

    if File.exists?(file)
      print " Unpacking prebuilt LLVM for #{@host}: "
      system "cd vm/external_libs; mkdir llvm; cd llvm; tar xjf ../prebuilt/llvm-#{@host}.tar.bz2"
      puts "done!"
      @llvm = :prebuilt
      return true
    end

    return false
  end

  def setup_path
    print "Validating '#{@llvm_path}': "
    if File.directory? @llvm_path
      ["Release", "Debug"].each do |which|
        sub = File.join(@llvm_path, which, "bin")
        if File.directory? sub
          puts "Ok! Using #{which}"
          @llvm_configure = File.join(@llvm_path, which, "bin", "llvm-config")
          @llvm = :config
          return true
        end
      end

      puts "ERROR. Doesn't appear to be built already!"
      return false
    end

    puts "ERROR. Path doesn't exist."
    return false
  end

  def setup_auto
    print " Checking for existing LLVM tree: "
    if File.directory?(@llvm_svn_dir)
      puts "found!"
      if File.exists?(File.join(@llvm_svn_dir, "Makefile.common"))
        @llvm = :svn
      else
        @llvm = :prebuilt
      end

      return
    else
      puts "not found."
    end

    # If they explicitly said where LLVM is, use that and fail hard.
    if @llvm_path
      unless setup_path
        puts "ABORT: Path '#{@llvm_path}' not a proper LLVM path"
        exit 1
      end

      return
    end

    unless @skip_system
      return if setup_config
    end

    return if setup_prebuilt
    return if setup_source

    puts "WARNING: Unable to configure for LLVM, disabling support."
    @use_llvm = false
  end

  def setup_config
    print " Checking for 'llvm-config': "
    which = ENV['PATH'].split(":").find do |path|
      File.exists? File.join(path, "llvm-config")
    end

    if which
      config = File.join(which, "llvm-config")
      version = `#{config} --version`.strip
      parts = version.sub(/svn$/, "").split(".").map { |i| i.to_i }

      # 2.6svn is an unknown beast, don't trust it.
      if version == "2.6svn" or parts[0] < 2 or parts[1] < 6
        puts "too old of a version"
      else
        puts "found! (version #{version})"
        @llvm_configure = config
        @llvm = :config
        return true
      end
    else
      puts "not found"
    end

    false
  end

  def c_includes
    str = []
    if File.exists? "/usr/local/include"
      str << "-I/usr/local/include"
    end

    if File.exists? "/opt/local/include"
      str << "-I/opt/local/include"
    end

    return str.join(" ")
  end

  def env(which)
    ENV[which] || ""
  end

  def has_function(name, includes=[])
    print "Checking for function '#{name}': "
    tf = Tempfile.new("rbx-test")
    includes.each do |i|
      tf.puts "#include <#{i}>"
    end

    tf.puts "int main() { void* ptr = &#{name}; }"

    tf.close

    `#{compiler} -S -o - -x c #{c_includes} #{env('CFLAGS')} #{tf.path} 2>&1`
    status = ($?.exitstatus == 0)

    tf.unlink

    if status
      puts "found!"
    else
      puts "not found."
    end

    return status
  end

  def detect_features
    if has_function("backtrace", ["execinfo.h"])
      @defines << "HAS_EXECINFO"
    end
  end

  def process
    if @use_llvm
      puts "Configuring LLVM..."
      setup_auto
    else
      print "WARNING: LLVM disabled."
    end

    puts

    detect_features
  end

  def compiler
    ENV['CC'] || "gcc"
  end

  def write_config
    unless @use_llvm
      @llvm = :no
      @llvm_configure = ""
    end

    File.open @config, "w" do |f|
      f.puts <<-EOC
module Rubinius
BUILD_CONFIG = {
:llvm => :#{@llvm},
:llvm_configure => "#{@llvm_configure}",
:compiler => "#{compiler()}",
:defines => #{@defines.inspect},
:host => "#{@host}",
:cpu => "#{@cpu}",
:vendor => "#{@vendor}",
:os => "#{@os}",
:bindir => "#{@bindir}",
:libdir => "#{@libdir}",
:runtime => "#{@runtime}",
:lib_path => "#{@lib_path}",
:ext_path => "#{@ext_path}",
:includedir => "#{@includedir}",
:mandir => "#{@mandir}",
:gemsdir => "#{@gemsdir}",
:program_name => "#{@program_name}",
:version => "#{@version}",
:libversion => "#{@libversion}",
:release_date => "#{@release_date}",
:config_version => #{@config_version}
}
end
EOC
    end

    Dir.mkdir "vm/gen" unless File.directory? "vm/gen"

    File.open "vm/gen/config.h", "w" do |f|
      f.puts <<-EOC
#define RBX_HOST "#{@host}"
#define RBX_CPU "#{@cpu}"
#define RBX_VENDOR "#{@vendor}"
#define RBX_OS "#{@os}"
#define RBX_BIN_PATH "#{@bindir}"
#define RBX_GEMS_PATH "#{@gemsdir}"
#define RBX_RUNTIME "#{@runtime}"
#define RBX_LIB_PATH "#{@lib_path}"
#define RBX_EXT_PATH "#{@ext_path}"
#define RBX_HDR_PATH "#{@includedir}"
#define RBX_VERSION "#{@version}"
#define RBX_LIB_VERSION "#{@libversion}"
#define RBX_BUILD_REV "#{@buildrev}"
#define RBX_LDSHARED "#{@ldshared}"
#define RBX_RELEASE_DATE "#{@release_date}"
EOC
    end
  end

  def print_debug
    puts "\nUsing the following configuration to build"
    puts "------------------------------------------"
    system "cat config.rb"
    puts "\nSetting the following defines for the VM"
    puts "----------------------------------------"
    system "cat vm/gen/config.h"
  end

  def run
    options
    parse ARGV
    process
    write_config
    print_debug if @verbose
    puts "\nConfigured. Run 'rake' to build and run VM tests and rubyspecs"
  end
end

STDOUT.sync = true
Configure.new(root).run
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