% Copyright 2026 Open-Guji (https://github.com/open-guji)
%
% Licensed under the Apache License, Version 2.0 (the "License");
% you may not use this file except in compliance with the License.
% You may obtain a copy of the License at
%
%     http://www.apache.org/licenses/LICENSE-2.0
%
% Unless required by applicable law or agreed to in writing, software
% distributed under the License is distributed on an "AS IS" BASIS,
% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
% See the License for the specific language governing permissions and
% limitations under the License.
% luatex-cn-linemark.sty
% Line Mark support for vertical typesetting (专名号/书名号)
% Uses PDF graphics commands instead of font glyphs
%
\RequirePackage{expl3}
\RequirePackage{xparse}
\ProvidesExplPackage {decorate/luatex-cn-linemark} {2026/02/18} {0.3.0} {Line Mark Support (专名号/书名号)}

% Load Lua module
\lua_now:n { require('decorate.luatex-cn-linemark') }

% ============================================================================
% Key-Value Parameters
% ============================================================================
\tl_new:N \l__luatexcn_linemark_type_tl
\tl_new:N \l__luatexcn_linemark_color_tl
\tl_new:N \l__luatexcn_linemark_offset_tl
\tl_new:N \l__luatexcn_linemark_amplitude_tl
\tl_new:N \l__luatexcn_linemark_linewidth_tl
\tl_new:N \l__luatexcn_linemark_style_tl

\keys_define:nn { luatexcn / linemark }
  {
    type .tl_set:N = \l__luatexcn_linemark_type_tl,
    type .initial:n = straight,
    color .tl_set:N = \l__luatexcn_linemark_color_tl,
    color .initial:n = black,
    offset .tl_set:N = \l__luatexcn_linemark_offset_tl,
    offset .initial:n = 0.6em,
    amplitude .tl_set:N = \l__luatexcn_linemark_amplitude_tl,
    amplitude .initial:n = medium,
    line-width .tl_set:N = \l__luatexcn_linemark_linewidth_tl,
    line-width .initial:n = 0.8pt,
    style .tl_set:N = \l__luatexcn_linemark_style_tl,
    style .initial:n = standard,
  }

% ============================================================================
% LineMark - Unified base command
% ============================================================================
% Syntax: \LineMark[type=straight, color=black, offset=0.6em]{content}
%
% Sets ATTR_LINE_MARK_ID on all characters in {content}.
% The attribute value is a group_id pointing to _G.line_mark_registry.
% Rendering is done by linemark.render_line_marks() in the render phase.
%
\NewDocumentCommand{\LineMark}{ O{} m }
  {
    \group_begin:
      \keys_set:nn { luatexcn / linemark } { #1 }
      % Register group in Lua and get group_id back via macro
      \lua_now:e
        {
          local~c~=~require('core.luatex-cn-constants')
          c.register_line_mark(
            "\luaescapestring{\tl_use:N~\l__luatexcn_linemark_type_tl}",
            "\luaescapestring{\tl_use:N~\l__luatexcn_linemark_color_tl}",
            "\luaescapestring{\tl_use:N~\l__luatexcn_linemark_offset_tl}",
            "\luaescapestring{\tl_use:N~\l__luatexcn_linemark_amplitude_tl}",
            "\luaescapestring{\tl_use:N~\l__luatexcn_linemark_linewidth_tl}",
            "\luaescapestring{\tl_use:N~\l__luatexcn_linemark_style_tl}"
          )
        }
      % Set attribute on all following characters (auto-propagates in TeX)
      \setluatexattribute\cnverticallinemark{\g__luatexcn_line_mark_gid}
      % Output content - characters inherit the attribute
      #2
      % Reset attribute
      \unsetluatexattribute\cnverticallinemark
    \group_end:
  }

% ============================================================================
% Convenience Commands
% ============================================================================

% 专名号 (Proper Name Mark) - straight line on left side
\NewDocumentCommand{\ProperNameMark}{ O{} m }
  {
    \LineMark[type=straight, #1]{#2}
  }

% 书名号 (Book Title Mark) - wavy line on left side
\NewDocumentCommand{\BookTitleMark}{ O{} m }
  {
    \LineMark[type=wavy, #1]{#2}
  }

% ============================================================================
% CJK Key Aliases (中文键值别名)
% ============================================================================
\keys_define:nn { luatexcn / linemark }
  {
    类型 .tl_set:N = \l__luatexcn_linemark_type_tl,
    類型 .tl_set:N = \l__luatexcn_linemark_type_tl,
    颜色 .tl_set:N = \l__luatexcn_linemark_color_tl,
    顏色 .tl_set:N = \l__luatexcn_linemark_color_tl,
    偏移 .tl_set:N = \l__luatexcn_linemark_offset_tl,
    振幅 .tl_set:N = \l__luatexcn_linemark_amplitude_tl,
    线宽 .tl_set:N = \l__luatexcn_linemark_linewidth_tl,
    線寬 .tl_set:N = \l__luatexcn_linemark_linewidth_tl,
    风格 .tl_set:N = \l__luatexcn_linemark_style_tl,
    風格 .tl_set:N = \l__luatexcn_linemark_style_tl,
  }

% ============================================================================
% CJK Aliases (中文别名)
% ============================================================================
% Simplified Chinese / 简体
\cs_new_eq:NN \专名号 \ProperNameMark
\cs_new_eq:NN \书名号 \BookTitleMark
\cs_new_eq:NN \下划线 \ProperNameMark
\cs_new_eq:NN \波浪线 \BookTitleMark
\NewCommandCopy{\线标}{\LineMark}
% Traditional Chinese / 繁体
\NewCommandCopy{\線標}{\LineMark}
\NewCommandCopy{\專名號}{\ProperNameMark}
\NewCommandCopy{\書名號}{\BookTitleMark}
\cs_new_eq:NN \下劃線 \ProperNameMark
\cs_new_eq:NN \波浪線 \BookTitleMark

% English aliases matching old names (backward compatibility)
\cs_new_eq:NN \Underline \ProperNameMark
\cs_new_eq:NN \WavyUnderline \BookTitleMark

\ExplSyntaxOff%
%
\endinput%