import { getIndentLineCount, getIndentCount } from "../scrapbox-userscript-std/text.ts";
import { makeSocket, patch } from "../scrapbox-userscript-std/mod.ts";
import { pool } from "../async-lib/mod.ts";
import { lightFormat } from "../date-fns/lightFormat.ts";
import type { Scrapbox } from "../scrapbox-jp%2Ftypes/userscript.ts";
declare const scrapbox: Scrapbox;

export const convert = (text: string): { promise: Promise<void>; text: string; } => {
  const [caption, ...lines] = text.split('\n');
  
  // 最初の行を講義の短縮名として使う
  const baseName = caption.trim();
  // 最初の行と同じindent数の行を、切り出すブロックの先頭とする
  const baseIndent = getIndentCount(caption);
  const blocks: {lines: string[]; index: number; }[] = [...divide(lines, baseIndent)];
  const promise = (async () => {
    const socket = await makeSocket();
    await Promise.all([...pool(
      3,
      blocks,
      (block) => patch(scrapbox.Project.name, `${baseName}-${block.index}`, (lines) => [
          ...lines.map(line => line.text),
          "目標",
          ...block.lines,
          "",
          "内容",
          " ",
          "",
          lightFormat(new Date(), "#yyyy-MM-dd HH:mm:ss"),
    ], { socket }),
    )]);
  })();
  
  return {
    promise: null,
    text: blocks.map((block) => `[${baseName}-${block.index}]`).join("\n"),
  };
};

function* divide(lines: string[], baseIndent: number) {
  for (let i = 0; i < lines.length; i++) {
    if (getIndentCount(lines[i]) !== baseIndent) continue;
    const index = lines[i].trim().split(".")[0];
    if(isNaN(parseInt(index))) continue;
    const count = getIndentLineCount(i, lines);
    yield { lines: lines.slice(i, i + 1 + count), index: parseInt(index) };
    i += count;
  }
}