#!/usr/bin/env ruby
#
# Copyright (c) 2010-2019 Kenshi Muto, Minero Aoki
#               1999-2007 Minero Aoki
#
# 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 'pathname'

bindir = Pathname.new(__FILE__).realpath.dirname
$LOAD_PATH.unshift((bindir + '../lib').realpath)

require 'review'
require 'optparse'

include ReVIEW::TextUtils

def sigmain
  Signal.trap(:INT) { exit 1 }
  if RUBY_PLATFORM !~ /mswin(?!ce)|mingw|cygwin|bccwin/
    Signal.trap(:PIPE, 'IGNORE')
  end
  main
rescue Errno::EPIPE
  exit 0
end

def main
  @config = ReVIEW::Configure.values
  @book = ReVIEW::Book::Base.load
  @book.config = @config

  @logger = ReVIEW.logger

  modes = nil
  files = ARGV unless ARGV.empty?
  opts = OptionParser.new
  opts.version = ReVIEW::VERSION
  opts.on('-a', '--all-chapters', 'Check all chapters.') do
    files = @book.chapters.map(&:path)
  end
  opts.on('-s', '--section N', 'Check section N. (deprecated)') do |n|
    ents = @book.parts[Integer(n) - 1] or
      raise ReVIEW::ApplicationError, "section #{n} not exist"
    files = ents.map(&:path)
  end
  opts.on('--text', 'Check text.') do
    modes ||= []
    modes.push :text
  end
  opts.on('--help', 'print this message and quit.') do
    puts opts.help
    exit 0
  end
  begin
    opts.parse!
  rescue OptionParser::ParseError => e
    @logger.error(e.message)
    puts opts.help
    exit 1
  end
  unless files
    @logger.error('no input')
    exit 1
  end
  modes ||= [:text]

  modes.each do |mode|
    case mode
    when :text
      check_text files
    else
      raise 'must not happen'
    end
  end
end

def check_text(files)
  re, neg = words_re("#{@book.basedir}/#{@book.reject_file}")
  files.each do |path|
    File.open(path) do |f|
      each_paragraph(f) do |para, lineno|
        s = para.join
        m = re.match(s)
        next if m.nil? || m[0] == @review_utils_word_ok
        next if neg and neg =~ s
        str, offset = find_line(para, re)
        out = sprintf("%s:%d: %s\n", path, lineno + offset, str)
        print out
      end
    end
  end
end

def find_line(lines, re)
  # single line?
  lines.each_with_index do |line, idx|
    if re =~ line
      return line.gsub(re, '<<<\&>>>'), idx
    end
  end

  # multiple lines?
  i = 0
  while i < lines.size - 1
    str = lines[i] + lines[i + 1]
    return str.gsub(re, '<<<\&>>>'), i if re =~ str
    i += 1
  end

  raise 'must not happen'
end

def words_re(rc)
  words = []
  nega = []
  File.foreach(rc) do |line|
    next if line[0, 1] == '#'
    if / !/ =~ line
      line, n = *line.split('!', 2)
      nega.push n.strip
    end
    words.push line.strip
  end
  return Regexp.compile(words.join('|')),
         nega.empty? ? nil : Regexp.compile(nega.join('|'))
end

def each_paragraph(f)
  @review_utils_word_ok = nil
  while line = f.gets
    case line
    when /\A\#@ok\((.*)\)/
      @review_utils_word_ok = $1
    when /\A\#@/
      # do nothing
      next
    when %r{\A//caption\{(.*?)//\}}
      yield [$1], f.filename, f.lineno
    when %r<\A//\w.*\{\s*\z>
      while line = f.gets
        break if %r{//\}} === line
      end
    when /\A=/
      yield [line.slice(/\A=+(?:\[.*?\])?\s+(.*)/, 1).strip], f.lineno
    when /\A\s*\z/
      # skip
      next
    else
      buf = [line.strip]
      lineno = f.lineno
      while line = f.gets
        break if line.strip.empty?
        break if %r{\A(?:=|//[\w\}])} =~ line
        next if /\A\#@/ =~ line
        buf.push line.strip
      end
      yield buf, lineno
      @review_utils_word_ok = nil
    end
  end
end

def each_paragraph_line(f, &block)
  each_paragraph(f) do |para, *|
    para.each(&block)
  end
end

sigmain