#!/usr/bin/env rdmd
/+
  - read in file .sst .ssi .ssm
  - loop twice
    - first
      - check for and skip code blocks
      - use unique code marker for endnote markers in text and give an endnote
        number ★1, increment
      - extract all endnotes in array
    - second
      - check that the footnote marker number count matches the number of notes
        in the array
        - if they match either:
            - substitute each endnote marker with the array footnote[number-1]
            - substitute each endnote marker with footnote
              as inlined footnote markup (footnote number not needed)
        - if they do not match exit
  - check whether changes have been made
    - if so write file with inline footnotes in sub-directory converted_output_/
      using the same name as the original file
    - else, exit
+/
import std.stdio;
import std.file;
import std.array : split;
import std.exception;
// import std.range;
import core.stdc.errno;
import std.regex;
import std.format;
import std.conv;
void main(string[] args) {
  static heading_a               = ctRegex!(`^:?[A][~] `, "m");
  static comment                 = ctRegex!(`^%+ `);
  static block_tic_code_open     = ctRegex!("^`{3} code(?:[.](?P<syntax>[a-z][0-9a-z#+_]+))?(?:[(](?P<attrib>[ a-zA-Z0-9;:,]*)[)])?");
  static block_tic_close         = ctRegex!("^(`{3})$","m");
  static block_curly_code_open   = ctRegex!(`^(?:code(?:[.](?P<syntax>[a-z][0-9a-z_]+))?(?:[(](?P<attrib>[ a-zA-Z0-9;:,]*)[)])?[{][ ]*$)`);
  static block_curly_code_close  = ctRegex!(`^([}]code)`);
  auto rgx_endnote_ref           = ctRegex!(`([~]\^)(?P<tail>[)\]]? |$)`, "gm");
  auto rgx_endnote               = ctRegex!(`^\^~\s+(.+|\n)`, "gm");
  char[][] header0Content1(in string src_text) { // cast(char[])
    /+ split string on _first_ match of "^:?A~\s" into [header, content] array/tuple +/
    char[][] header_and_content;
    auto m = (cast(char[]) src_text).matchFirst(heading_a);
    header_and_content ~= m.pre;
    header_and_content ~= m.hit ~ m.post;
    assert(header_and_content.length == 2,
      "document markup is broken, header body split == "
      ~ header_and_content.length.to!string
      ~ "; (header / body array split should == 2 (split is on level A~))"
    );
    return header_and_content;
  }
  foreach(arg; args[1..$]) {
    if (
      !(arg.match(regex(r"--\w+")))
      && arg.match(regex(r"\w+?\.ss[itm]"))
    ) {
      writeln(arg);
      string filename                  = arg;
      try {
        string[] munged_header, munged_contents, munged_endnotes, endnote_refs;
        string text                    = filename.readText;
        char[][] hc                    = header0Content1(text);
        char[] src_header              = hc[0];
        string[] headers               = src_header.to!string.split("\n\n");
        char[] src_txt                 = hc[1];
        string[] paragraphs            = src_txt.to!string.split("\n\n");
        int endnote_ref_count          = 0;
        int[string] type = [
          "curly_code"                 : 0,
          "tic_code"                   : 0,
        ];
        string _tmp_header;
        foreach (h_; headers) {                                                                                          /+ loop to inline endnotes +/
          _tmp_header = "";
          if (h_.match(regex(r"^[@\[]?title[:\]]?"))) {                                                                  // title
            if (auto m = h_.match(regex(r"^@title:(?:\s+(?P<c>.+)|$)"))) {                                               // sisu bespoke markup
              if (m.captures["c"].length == 0) {
                _tmp_header ~= "title:";
              } else {
                _tmp_header ~= "title:\n  main: " ~ "\"" ~ m.captures["c"] ~ "\"";
              }
            } else if (auto m = h_.match(regex(r"^title\s*=\s*(?P<c>.+)"))) {                                            // toml?
              if (m.captures["c"].length == 0) {
                _tmp_header ~= "title:";
              } else {
                _tmp_header ~= "title:\n  main: " ~ "\"" ~ m.captures["c"] ~ "\"";
              }
            } else if (auto m = h_.match(regex(r"^\[title\]"))) {                                                        // toml markup
              _tmp_header ~= "title:";
            } else if (auto m = h_.match(regex(r"^title(?:\s+(?P<c>.+)|\s+\\$)"))) {                                     // sdlang markup
              if (m.captures["c"].length == 0) {
                _tmp_header ~= "title:";
              } else {
                _tmp_header ~= "title:\n  main: " ~ "\"" ~ m.captures["c"] ~ "\"";
              }
            }
            if (h_.match(regex(r"^\s*[:]?(?:main)[:= ]?", "m"))) {
              if (auto m = h_.match(regex(r"^\s+(?P<h>:main):(?:\s+(?P<c>.+)|$)", "m"))) {                                // sisu bespoke markup
                _tmp_header ~= "  main: " ~ "\"" ~ m.captures["c"] ~ "\"";
              } else if (auto m = h_.match(regex(r"^\s*(?P<h>main)\s*=\s*(?P<c>.+)", "m"))) {                            // toml?
                _tmp_header ~= "  main: " ~ m.captures["c"];
              } else if (auto m = h_.match(regex(r"^\s+(?P<h>main)(?:\s*\s*(?P<c>.+)|$)", "m"))) {                       // toml markup
                _tmp_header ~= "  main: " ~ "\"" ~ m.captures["c"] ~ "\"";
              } else if (auto m = h_.match(regex(r"^\s+(?P<h>main)(?:\s+(?P<c>.+)|\s+\\$)", "m"))) {                     // sdlang markup
                _tmp_header ~= "  main: " ~ "\"" ~ m.captures["c"] ~ "\"";
              }
            }
            if (h_.match(regex(r"^\s*[:]?(?:sub(title)?)[:= ]?", "m"))) {
              if (auto m = h_.match(regex(r"^\s+:sub(?:title)?:(?:\s+(?P<c>.+)|$)", "m"))) {                             // sisu bespoke markup
                _tmp_header ~= "  subtitle: " ~ "\"" ~ m.captures["c"] ~ "\"";
              } else if (auto m = h_.match(regex(r"^\s*sub(?:title)?\s*=\s*(?P<c>.+)$", "m"))) {                         // toml?
                _tmp_header ~= "  subtitle: " ~ m.captures["c"];
              } else if (auto m = h_.match(regex(r"^\s+(?:title)?(?:\s*\s*(?P<c>.+)|$)", "m"))) {                        // toml markup
                _tmp_header ~= "  subtitle: " ~ "\"" ~ m.captures["c"] ~ "\"";
              } else if (auto m = h_.match(regex(r"^\s+(?:title)?(?:\s+(?P<c>.+)|\s+\\$)", "m"))) {                      // sdlang markup
                _tmp_header ~= "  subtitle: " ~ "\"" ~ m.captures["c"] ~ "\"";
              }
            }
          }
          if (h_.match(regex(r"^[@\[]?rights[:\]]?"))) {                                                                 // rights
            if (auto m = h_.match(regex(r"^@rights:[ ]+(?P<c>.+)$"))) {                                                  // sisu bespoke markup
              _tmp_header ~= "rights: \n  copyright: \"" ~ m.captures["c"] ~ "\"";
            } else if (auto m = h_.match(regex(r"^@rights:"))) {                                                         // sisu bespoke markup
              _tmp_header ~= "rights:";
            } else if (auto m = h_.match(regex(r"^\[rights\]", "m"))) {                                                  // toml markup
              _tmp_header ~= "rights:";
            } else if (auto m = h_.match(regex(r"^rights:"))) {                                                          // sdlang markup
              _tmp_header ~= "rights:";
            }
            if (h_.match(regex(r"^\s*[:]?copyright[:= ]?", "m"))) {
              if (auto m = h_.match(regex(r"^\s+:copyright:(?:\s+(?P<c>.+)|$)", "m"))) {                                 // sisu bespoke markup
                _tmp_header ~= "  copyright: " ~ "\"" ~ m.captures["c"] ~ "\"";
              } else if (auto m = h_.match(regex(r"^\s*copyright\s*=\s*(?P<c>.+)", "m"))) {                              // toml?
                _tmp_header ~= "  copyright: " ~ m.captures["c"];
              } else if (auto m = h_.match(regex(r"^\s+<h>copyright(?:\s*\s*(?P<c>.+)|$)", "m"))) {                      // toml markup
                _tmp_header ~= "  copyright: " ~ "\"" ~ m.captures["c"] ~ "\"";
              } else if (auto m = h_.match(regex(r"^\s+copyright(?:\s+(?P<c>.+)|\s+\\$)", "m"))) {                       // sdlang markup
                _tmp_header ~= "  copyright: " ~ "\"" ~ m.captures["c"] ~ "\"";
              }
            }
            if (h_.match(regex(r"^\s*[:]?licen[cs]e[:= ]?", "m"))) {
              if (auto m = h_.match(regex(r"^\s+:licen[cs]e:(?:\s+(?P<c>.+)|$)", "m"))) {                                // sisu bespoke markup
                _tmp_header ~= "  license: " ~ "\"" ~ m.captures["c"] ~ "\"";
              } else if (auto m = h_.match(regex(r"^\s*licen[cs]e\s*=\s*(?P<c>.+)$", "m"))) {                            // toml?
                _tmp_header ~= "  license: " ~ m.captures["c"];
              } else if (auto m = h_.match(regex(r"^\s+licen[cs]e(?:\s*\s*(?P<c>.+)|$)", "m"))) {                        // toml markup
                _tmp_header ~= "  license: " ~ "\"" ~ m.captures["c"] ~ "\"";
              } else if (auto m = h_.match(regex(r"^\s+licen[cs]e(?:\s+(?P<c>.+)|\s+\\$)", "m"))) {                      // sdlang markup
                _tmp_header ~= "  license: " ~ "\"" ~ m.captures["c"] ~ "\"";
              }
            }
          }
          if (_tmp_header.length > 0) {
            munged_header ~= _tmp_header;
          } else {
            munged_header ~= h_;
          }
        }
        writeln(munged_header);
        foreach (paragraph; paragraphs) {                                                                                  /+ loop to gather binary endnotes +/
          if ( !( type["curly_code"] == 1 || type["tic_code"] == 1)
            && paragraph.match(rgx_endnote)
          ) {
            munged_endnotes ~= replaceAll!(m => m[1])
              (paragraph, rgx_endnote);
          } else {
            if ( type["curly_code"] == 1 || type["tic_code"] == 1
              || paragraph.matchFirst(block_curly_code_open)
              || paragraph.matchFirst(block_tic_code_open)
            ) { /+ code blocks identified, no munging +/
              if ( type["curly_code"] == 1
                && paragraph.matchFirst(block_curly_code_close)
              ) {
                type["curly_code"] = 0;
              } else if (type["tic_code"] == 1
                && paragraph.matchFirst(block_tic_close)
              ) {
                type["tic_code"] = 0;
              } else if (paragraph.matchFirst(block_curly_code_open)) {
                type["curly_code"] = 1;
              } else if (paragraph.matchFirst(block_tic_code_open)) {
                type["tic_code"] = 1;
              }
              munged_contents ~= paragraph;
            } else { /+ regular content, not a code block +/
              if (auto m = paragraph.matchAll(rgx_endnote_ref)) {
                foreach (n; m) {
                  endnote_ref_count++; // endnote_refs ~= (n.captures[1]);
                }
              }
              paragraph = replaceAll!(m => " \\\\ " )
                (paragraph, regex(r"\s*<(?:/\s*|:)?br>\s*")); // (paragraph, regex(r"(<br>)"));
              munged_contents ~= paragraph;
            }
          }
        }
        {
          import std.outbuffer;
          auto buffer = new OutBuffer();
          foreach (header; munged_header) { /+ loop to inline endnotes +/
            buffer.write(header ~ "\n\n");
          }
          if (munged_endnotes.length == endnote_ref_count) {
            int endnote_count = -1;
            foreach (content; munged_contents) { /+ loop to inline endnotes +/
              content = replaceAll!(m => "~{ " ~ munged_endnotes[++endnote_count] ~ " }~" ~ m["tail"] )
                (content, rgx_endnote_ref); // endnote_ref cannot occur in a code block or else fail
              buffer.write(content ~ "\n\n");
            }
            if (buffer) {
              try {
                string dir_out = "converted_output_";
                string path_and_file_out = dir_out ~ "/" ~ filename;
                dir_out.mkdirRecurse;
                auto f = File(path_and_file_out, "w");
                f.write(buffer);
                // writeln("wrote: ", path_and_file_out);
              } catch (FileException ex) {
                writeln("did not write file");
                // Handle errors
              }
            }
          } else {
            foreach (content; munged_contents) { /+ loop to inline endnotes +/
              buffer.write(content ~ "\n\n");
            }
          }
        }
      } catch (ErrnoException ex) {
        switch(ex.errno) {
          case EPERM:
          case EACCES: // Permission denied
            break;
          case ENOENT: // File does not exist
            break;
          default:     // Handle other errors
            break;
        }
      }
    }
  }
}