import { extractCode } from "./codeParser";

export interface ParsedDropFilename {
  /** Original filename with extension. */
  original: string;
  /** Canonical "PREFIX-NUMBER" code, or null. */
  code: string | null;
  /** Actress display names parsed from filename (after the first " - "). */
  actresses: string[];
  /** Suggested filename to save as (CODE.ext) when code is known; otherwise the original. */
  targetFilename: string;
}

/**
 * Parse a dropped image filename of the form:
 *   "DDK-134.jpg"
 *   "DDK-134 - Shuri Atomi.jpg"
 *   "DDK-134 - Shuri Atomi, Reika Aiba.jpg"
 *
 * The first " - " (space-hyphen-space) after the code separates the code/title from
 * the actress list. Multiple actresses are comma-separated.
 */
export function parseDroppedFilename(name: string): ParsedDropFilename {
  const extMatch = name.match(/\.([^.]+)$/);
  const ext = extMatch ? extMatch[1] : "";
  const stem = ext ? name.slice(0, -(ext.length + 1)) : name;
  const code = extractCode(name);

  let actresses: string[] = [];
  const sepIdx = stem.indexOf(" - ");
  if (sepIdx !== -1) {
    const tail = stem.slice(sepIdx + 3).trim();
    if (tail) {
      actresses = tail
        .split(/\s*,\s*/)
        .map((s) => s.trim())
        .filter(Boolean);
    }
  }

  const targetFilename = code ? (ext ? `${code}.${ext}` : code) : name;
  return { original: name, code, actresses, targetFilename };
}