from datetime import datetime
from pathlib import Path
import json

def moment_to_strftime(format_string:str) -> str:
  replacements = [
    ("YYYY", "%Y"),
    ("YY", "%y"),
    ("MMMM", "%B"),
    ("MMM", "%b"),
    ("MM", "%m"),
    ("DDDD", "%j"),
    ("DD", "%d"),
    ("dddd", "%A"),
    ("ddd", "%a"),
  ]
  converted = format_string or "YYYY-MM-DD"
  for moment_token, strftime_token in replacements:
    converted = converted.replace(moment_token, strftime_token)
  return converted

def daily_note_path_for_vault(vault_root:Path, now:datetime|None = None) -> str:
  settings_path = vault_root / ".obsidian" / "daily-notes.json"
  folder = ""
  format_string = "YYYY-MM-DD"

  if settings_path.exists() and settings_path.is_file():
    try:
      settings = json.loads(settings_path.read_text(encoding="utf-8"))
      if isinstance(settings, dict):
        folder_value = settings.get("folder")
        format_value = settings.get("format")
        if isinstance(folder_value, str):
          folder = folder_value.strip().strip("/")
        if isinstance(format_value, str) and format_value.strip():
          format_string = format_value.strip()
    except (OSError, json.JSONDecodeError):
      pass

  note_name = (now or datetime.now()).strftime(moment_to_strftime(format_string))
  if not note_name.endswith(".md"):
    note_name += ".md"
  return f"{folder}/{note_name}" if folder else note_name