import json
from pathlib import Path
from datetime import datetime

def load_songlist(songlist_path="data/songList.json"):
    songlist_file = Path(songlist_path)
    if not songlist_file.exists():
        print(f"⚠️ Songlist file not found: {songlist_path}")
        return []
    try:
        with open(songlist_file, 'r', encoding='utf-8') as f:
            data = json.load(f)
        all_songs = []
        for category in data:
            if "songs" in category:
                for song in category["songs"]:
                    if "artist" in song and "title" in song:
                        all_songs.append({
                            "artist": song["artist"].strip(),
                            "title": song["title"].strip(),
                            "position": song.get("position", 0)
                        })
        print(f"📋 Loaded {len(all_songs)} songs from songlist")
        return all_songs
    except (json.JSONDecodeError, FileNotFoundError) as e:
        print(f"⚠️ Could not load songlist: {e}")
        return []

def normalize_title(title):
    normalized = title.replace("(Karaoke Version)", "").replace("(Karaoke)", "").strip()
    return " ".join(normalized.split()).lower()

def load_songlist_tracking(tracking_path="data/songlist_tracking.json"):
    tracking_file = Path(tracking_path)
    if not tracking_file.exists():
        return {}
    try:
        with open(tracking_file, 'r', encoding='utf-8') as f:
            return json.load(f)
    except (json.JSONDecodeError, FileNotFoundError) as e:
        print(f"⚠️ Could not load songlist tracking: {e}")
        return {}

def save_songlist_tracking(tracking, tracking_path="data/songlist_tracking.json"):
    try:
        with open(tracking_path, 'w', encoding='utf-8') as f:
            json.dump(tracking, f, indent=2, ensure_ascii=False)
    except Exception as e:
        print(f"⚠️ Could not save songlist tracking: {e}")

def is_songlist_song_downloaded(tracking, artist, title):
    key = f"{artist.lower()}_{normalize_title(title)}"
    return key in tracking

def mark_songlist_song_downloaded(tracking, artist, title, channel_name, file_path):
    key = f"{artist.lower()}_{normalize_title(title)}"
    tracking[key] = {
        "artist": artist,
        "title": title,
        "channel": channel_name,
        "file_path": str(file_path),
        "downloaded_at": datetime.now().isoformat()
    }
    save_songlist_tracking(tracking)