# encoding: utf-8
#
# Copyright (c) 2010-2016 Kenshi Muto and Masayoshi Takahashi
#
# This program is free software.
# You can distribute or modify this program under the terms of
# the GNU LGPL, Lesser General Public License version 2.1.
# For details of the GNU LGPL, see the file "COPYING".
#
require 'optparse'
require 'yaml'
require 'fileutils'
require 'erb'
require 'tmpdir'

require 'review/i18n'
require 'review/book'
require 'review/configure'
require 'review/converter'
require 'review/latexbuilder'
require 'review/yamlloader'
require 'review/version'
require 'review/makerhelper'
require 'review/template'


module ReVIEW
  class PDFMaker

    include FileUtils
    include ReVIEW::LaTeXUtils

    attr_accessor :config, :basedir, :basehookdir

    def initialize
      @basedir = nil
      @basehookdir = nil
      @input_files = Hash.new{|h, key| h[key] = ""}
    end

    def system_or_raise(*args)
      Kernel.system(*args) or raise("failed to run command: #{args.join(' ')}")
    end

    def error(msg)
      $stderr.puts "#{File.basename($0, '.*')}: error: #{msg}"
      exit 1
    end

    def warn(msg)
      $stderr.puts "#{File.basename($0, '.*')}: warning: #{msg}"
    end

    def pdf_filepath
      File.join(@basedir, @config["bookname"]+".pdf")
    end

    def remove_old_file
      FileUtils.rm_f(pdf_filepath)
    end

    def build_path
      if @config["debug"]
        path = "#{@config["bookname"]}-pdf"
        if File.exist?(path)
          FileUtils.rm_rf(path, :secure => true)
        end
        Dir.mkdir(path)
        return path
      else
        return Dir.mktmpdir("#{@config["bookname"]}-pdf-")
      end
    end

    def check_compile_status(ignore_errors)
      return unless @compile_errors

      if ignore_errors
        $stderr.puts "compile error, but try to generate PDF file"
      else
        error "compile error, No PDF file output."
      end
    end

    def self.execute(*args)
      self.new.execute(*args)
    end

    def parse_opts(args)
      cmd_config = Hash.new
      opts = OptionParser.new

      opts.banner = "Usage: review-pdfmaker configfile"
      opts.version = ReVIEW::VERSION
      opts.on('--help', 'Prints this message and quit.') do
        puts opts.help
        exit 0
      end
      opts.on('--[no-]debug', 'Keep temporary files.') do |debug|
        cmd_config["debug"] = debug
      end
      opts.on('--ignore-errors', 'Ignore review-compile errors.') do
        cmd_config["ignore-errors"] = true
      end

      opts.parse!(args)
      if args.size != 1
        puts opts.help
        exit 0
      end

      return cmd_config, args[0]
    end

    def execute(*args)
      @config = ReVIEW::Configure.values
      @config.maker = "pdfmaker"
      cmd_config, yamlfile = parse_opts(args)
      loader = ReVIEW::YAMLLoader.new
      @config.deep_merge!(loader.load_file(yamlfile))
      # YAML configs will be overridden by command line options.
      @config.merge!(cmd_config)
      I18n.setup(@config["language"])
      @basedir = File.dirname(yamlfile)
      @basehookdir = File.absolute_path(File.dirname(yamlfile))

      begin
        @config.check_version(ReVIEW::VERSION)
      rescue ReVIEW::ConfigError => e
        warn e.message
      end
      generate_pdf(yamlfile)
    end

    def generate_pdf(yamlfile)
      remove_old_file
      @path = build_path()
      begin
        @compile_errors = nil

        book = ReVIEW::Book.load(@basedir)
        book.config = @config
        @converter = ReVIEW::Converter.new(book, ReVIEW::LATEXBuilder.new)
        book.parts.each do |part|
          if part.name.present?
            if part.file?
              output_chaps(part.name, yamlfile)
              @input_files["CHAPS"] << %Q|\\input{#{part.name}.tex}\n|
            else
              @input_files["CHAPS"] << %Q|\\part{#{part.name}}\n|
            end
          end

          part.chapters.each do |chap|
            filename = File.basename(chap.path, ".*")
            output_chaps(filename, yamlfile)
            @input_files["PREDEF"] << "\\input{#{filename}.tex}\n" if chap.on_PREDEF?
            @input_files["CHAPS"] << "\\input{#{filename}.tex}\n" if chap.on_CHAPS?
            @input_files["APPENDIX"] << "\\input{#{filename}.tex}\n" if chap.on_APPENDIX?
            @input_files["POSTDEF"] << "\\input{#{filename}.tex}\n" if chap.on_POSTDEF?
          end
        end

        check_compile_status(@config["ignore-errors"])

        @config["usepackage"] = ""
        if @config["texstyle"]
          @config["usepackage"] = "\\usepackage{#{@config['texstyle']}}"
        end

        copy_images("./images", File.join(@path, "images"))
        copyStyToDir(File.join(Dir.pwd, "sty"), @path)
        copyStyToDir(File.join(Dir.pwd, "sty"), @path, "fd")
        copyStyToDir(File.join(Dir.pwd, "sty"), @path, "cls")
        copyStyToDir(Dir.pwd, @path, "tex")

        template = get_template
        Dir.chdir(@path) do
          File.open("./book.tex", "wb"){|f| f.write(template)}

          call_hook("hook_beforetexcompile")

          ## do compile
          if ENV["REVIEW_SAFE_MODE"].to_i & 4 > 0
            warn "command configuration is prohibited in safe mode. ignored."
          else
            texcommand = @config["texcommand"] if @config["texcommand"]
            dvicommand = @config["dvicommand"] if @config["dvicommand"]
            dvioptions = @config["dvioptions"] if @config["dvioptions"]
            texoptions = @config["texoptions"] if @config["texoptions"]
          end
          3.times do
            system_or_raise("#{texcommand} #{texoptions} book.tex")
          end
          call_hook("hook_aftertexcompile")

          if File.exist?("book.dvi")
            system_or_raise("#{dvicommand} #{dvioptions} book.dvi")
          end
        end
        call_hook("hook_afterdvipdf")

        FileUtils.cp(File.join(@path, "book.pdf"), pdf_filepath)

      ensure
        unless @config["debug"]
          remove_entry_secure @path
        end
      end
    end

    def output_chaps(filename, yamlfile)
      $stderr.puts "compiling #{filename}.tex"
      begin
        @converter.convert(filename+".re", File.join(@path, filename+".tex"))
      rescue => e
        @compile_errors = true
        warn "compile error in #{filename}.tex (#{e.class})"
        warn e.message
      end
    end

    # PDFMaker#copy_images should copy image files _AND_ execute extractbb (or ebb).
    #
    def copy_images(from, to)
      if File.exist?(from)
        Dir.mkdir(to)
        ReVIEW::MakerHelper.copy_images_to_dir(from, to)
        Dir.chdir(to) do
          images = Dir.glob("**/*").find_all{|f|
            File.file?(f) and f =~ /\.(jpg|jpeg|png|pdf|ai|eps|tif)\z/
          }
          break if images.empty?
          system("extractbb", *images)
          unless system("extractbb", "-m", *images)
            system_or_raise("ebb", *images)
          end
        end
      end
    end

    def make_custom_page(file)
      file_sty = file.to_s.sub(/\.[^.]+$/, ".tex")
      if File.exist?(file_sty)
        File.read(file_sty)
      else
        nil
      end
    end

    def join_with_separator(value, sep)
      if value.kind_of? Array
        value.join(sep)
      else
        value
      end
    end

    def make_colophon_role(role)
      if @config[role].present?
        initialize_metachars(@config["texcommand"])
        return "#{ReVIEW::I18n.t(role)} & #{escape_latex(join_with_separator(@config.names_of(role), ReVIEW::I18n.t("names_splitter")))} \\\\\n"
      else
        ""
      end
    end

    def make_colophon
      colophon = ""
      @config["colophon_order"].each do |role|
        colophon += make_colophon_role(role)
      end
      colophon
    end

    def make_authors
      authors = ""
      if @config["aut"].present?
        author_names = join_with_separator(@config.names_of("aut").map{|s| escape_latex(s)}, ReVIEW::I18n.t("names_splitter"))
        authors = ReVIEW::I18n.t("author_with_label", author_names)
      end
      if @config["csl"].present?
        csl_names = join_with_separator(@config.names_of("csl").map{|s| escape_latex(s)}, ReVIEW::I18n.t("names_splitter"))
        authors += " \\\\\n"+ ReVIEW::I18n.t("supervisor_with_label", csl_names)
      end
      if @config["trl"].present?
        trl_names = join_with_separator(@config.names_of("trl").map{|s| escape_latex(s)}, ReVIEW::I18n.t("names_splitter"))
        authors += " \\\\\n"+ ReVIEW::I18n.t("translator_with_label", trl_names)
      end
      authors
    end

    def make_history_list
      buf = []
      if @config["history"]
        @config["history"].each_with_index do |items, edit|
          items.each_with_index do |item, rev|
            editstr = (edit == 0) ? ReVIEW::I18n.t("first_edition") : ReVIEW::I18n.t("nth_edition","#{edit+1}")
            revstr = ReVIEW::I18n.t("nth_impression", "#{rev+1}")
            if item =~ /\A\d+\-\d+\-\d+\Z/
              buf << ReVIEW::I18n.t("published_by1", [date_to_s(item), editstr+revstr])
            else
              # custom date with string
              item.match(/\A(\d+\-\d+\-\d+)[\s　](.+)/) do |m|
                buf << ReVIEW::I18n.t("published_by3", [date_to_s(m[1]), m[2]])
              end
            end
          end
        end
      elsif @config["date"]
        buf << ReVIEW::I18n.t("published_by2",
                              date_to_s(@config["date"]))
      end
      buf
    end

    def date_to_s(date)
      require 'date'
      d = Date.parse(date)
      d.strftime(ReVIEW::I18n.t("date_format"))
    end

    def get_template
      dclass = @config["texdocumentclass"] || []
      @documentclass = dclass[0] || "jsbook"
      @documentclassoption = dclass[1] || "uplatex,oneside"

      @okuduke = make_colophon
      @authors = make_authors

      @custom_titlepage = make_custom_page(@config["cover"]) || make_custom_page(@config["coverfile"])
      @custom_originaltitlepage = make_custom_page(@config["originaltitlefile"])
      @custom_creditpage = make_custom_page(@config["creditfile"])

      @custom_profilepage = make_custom_page(@config["profile"])
      @custom_advfilepage = make_custom_page(@config["advfile"])
      if @config["colophon"] && @config["colophon"].kind_of?(String)
        @custom_colophonpage = make_custom_page(@config["colophon"])
      end
      @custom_backcoverpage = make_custom_page(@config["backcover"])

      if @config["pubhistory"]
        warn "pubhistory is oboleted. use history."
      else
        @config["pubhistory"] = make_history_list.join("\n")
      end
      if @documentclass == "ubook" || @documentclass == "utbook"
        @coverimageoption = "width=\\textheight,height=\\textwidth,keepaspectratio,angle=90"
      else
        @coverimageoption = "width=\\textwidth,height=\\textheight,keepaspectratio"
      end

      @locale_latex = Hash.new
      part_tuple = I18n.get("part").split(/\%[A-Za-z]{1,3}/, 2)
      chapter_tuple = I18n.get("chapter").split(/\%[A-Za-z]{1,3}/, 2)
      appendix_tuple = I18n.get("appendix").split(/\%[A-Za-z]{1,3}/, 2)
      @locale_latex["prepartname"] = part_tuple[0]
      @locale_latex["postpartname"] = part_tuple[1]
      @locale_latex["prechaptername"] = chapter_tuple[0]
      @locale_latex["postchaptername"] = chapter_tuple[1]
      @locale_latex["preappendixname"] = appendix_tuple[0]
      @locale_latex["postappendixname"] = appendix_tuple[1]

      template = File.expand_path('./latex/layout.tex.erb', ReVIEW::Template::TEMPLATE_DIR)
      layout_file = File.join(@basedir, "layouts", "layout.tex.erb")
      if File.exist?(layout_file)
        template = layout_file
      end

      @texcompiler = File.basename(@config["texcommand"], ".*")

      erb = ReVIEW::Template.load(template, '-')
      erb.result(binding)
    end

    def copyStyToDir(dirname, copybase, extname = "sty")
      unless File.directory?(dirname)
        warn "No such directory - #{dirname}"
        return
      end

      Dir.open(dirname) do |dir|
        dir.each do |fname|
          if File.extname(fname).downcase == "."+extname
            FileUtils.mkdir_p(copybase)
            FileUtils.cp File.join(dirname, fname), copybase
          end
        end
      end
    end

    def call_hook(hookname)
      if @config["pdfmaker"].instance_of?(Hash) && @config["pdfmaker"][hookname]
        hook = File.absolute_path(@config["pdfmaker"][hookname], @basehookdir)
        if ENV["REVIEW_SAFE_MODE"].to_i & 1 > 0
          warn "hook configuration is prohibited in safe mode. ignored."
        else
          system_or_raise("#{hook} #{Dir.pwd} #{@basehookdir}")
        end
      end
    end
  end
end