import sqlite3
import os

# Define base path for the server directory
BASE_DIR = os.path.dirname(os.path.abspath(__file__))
DB_PATH = os.path.join(BASE_DIR, "code.db")
TXT_PATH = os.path.join(BASE_DIR, "code.txt")

def create_table():
    conn = sqlite3.connect(DB_PATH)
    cursor = conn.cursor()
    cursor.execute("""
    CREATE TABLE IF NOT EXISTS code (
        id INTEGER PRIMARY KEY,
        titre TEXT,
        niveau INTEGER,
        mots_cle TEXT,
        enonce TEXT NOT NULL,
        test TEXT
    )
    """)
    cursor.execute("""
    CREATE TABLE IF NOT EXISTS multiplayer_sessions (
        game_code TEXT PRIMARY KEY,
        exercise_id INTEGER,
        status TEXT, -- 'open', 'active', 'finished'
        winner TEXT,
        include_terminale BOOLEAN DEFAULT 0,
        created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
    )
    """)
    cursor.execute("""
    CREATE TABLE IF NOT EXISTS multiplayer_players (
        game_code TEXT,
        username TEXT,
        joined_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
        PRIMARY KEY (game_code, username)
    )
    """)
    cursor.execute("""
    CREATE TABLE IF NOT EXISTS br_sessions (
        game_code TEXT PRIMARY KEY,
        niveau INTEGER,
        status TEXT, -- 'open', 'active', 'round_end', 'finished'
        winner TEXT,
        current_exercise_id INTEGER,
        used_exercises TEXT, -- JSON string list of IDs
        round_start_time TIMESTAMP,
        round_end_time TIMESTAMP,
        include_terminale BOOLEAN DEFAULT 0,
        created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
    )
    """)
    cursor.execute("""
    CREATE TABLE IF NOT EXISTS br_players (
        game_code TEXT,
        username TEXT,
        state TEXT, -- 'playing', 'qualified', 'eliminated', 'eliminated_this_round'
        joined_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
        PRIMARY KEY (game_code, username)
    )
    """)
    
    # Data cleanup/migration for existing exercises
    try:
        cursor.execute("SELECT id, titre, niveau FROM code")
        rows = cursor.fetchall()
        for r_id, r_titre, r_niveau in rows:
            needs_update = False
            new_titre = r_titre
            new_niveau = r_niveau
            
            if isinstance(r_titre, str) and (r_titre.endswith('\n') or r_titre.endswith('\r')):
                new_titre = r_titre.strip()
                needs_update = True
                
            try:
                if isinstance(r_niveau, str):
                    new_niveau = int(r_niveau.strip())
                    needs_update = True
                elif not isinstance(r_niveau, int):
                    new_niveau = int(r_niveau)
                    needs_update = True
            except:
                pass
                
            if needs_update:
                cursor.execute("UPDATE code SET titre = ?, niveau = ? WHERE id = ?", (new_titre, new_niveau, r_id))
        conn.commit()
    except sqlite3.OperationalError:
        pass # Table might not exist yet
    
    # Migration: Add joined_at if it doesn't exist
    try:
        cursor.execute("ALTER TABLE multiplayer_players ADD COLUMN joined_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP")
    except sqlite3.OperationalError:
        pass # Column already exists
    
    try:
        cursor.execute("ALTER TABLE br_players ADD COLUMN joined_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP")
    except sqlite3.OperationalError:
        pass # Column already exists

    # Migration: Add include_terminale to sessions if missing
    try:
        cursor.execute("ALTER TABLE multiplayer_sessions ADD COLUMN include_terminale BOOLEAN DEFAULT 0")
    except sqlite3.OperationalError:
        pass # Column already exists
    
    try:
        cursor.execute("ALTER TABLE br_sessions ADD COLUMN include_terminale BOOLEAN DEFAULT 0")
    except sqlite3.OperationalError:
        pass # Column already exists

    # We load exercises from code.txt if table is empty or we want to refresh
    cursor.execute("SELECT count(*) FROM code")
    count = cursor.fetchone()[0]
    
    if count == 0:
        if not os.path.exists(TXT_PATH):
            import logging
            logging.error(f"CRITICAL: {TXT_PATH} not found! Exercises will not be loaded.")
            conn.close()
            return
            
        try:
            with open(TXT_PATH, 'r', encoding='utf-8') as f:
                content = f.read()
            
            # Use a more robust separator splitting that handles various line endings
            # Each exercise is separated by ;;; (5 parts per exercise)
            parts = content.split(";;;")
            num_exercises = 0
            
            # An exercise has 5 fields + the separator itself creates extra parts if not handled carefully
            # Let's clean the parts and group them by 5
            cleaned_parts = [p.strip() for p in parts if p.strip() or parts.index(p) < len(parts)-1]
            
            # Actually, the logic should be: split by ;;;, and every 5 parts is an exercise
            # The last part might be empty if the file ends with ;;;
            i = 0
            exercise_id = 1
            while i + 4 < len(cleaned_parts):
                titre = cleaned_parts[i]
                niveau = cleaned_parts[i+1]
                mots_cle = cleaned_parts[i+2]
                enonce = cleaned_parts[i+3]
                test = cleaned_parts[i+4]
                
                try:
                    cursor.execute(
                        "INSERT INTO code (id, titre, niveau, mots_cle, enonce, test) VALUES (?, ?, ?, ?, ?, ?)", 
                        (exercise_id, titre, int(niveau), mots_cle, enonce, test)
                    )
                    exercise_id += 1
                    num_exercises += 1
                except (ValueError, sqlite3.Error) as e:
                    import logging
                    logging.warning(f"Skipping malformed exercise at index {i}: {e}")
                
                i += 5
            
            conn.commit()
            import logging
            logging.info(f"Successfully loaded {num_exercises} exercises from {TXT_PATH}")
            
        except Exception as e:
            import logging
            logging.error(f"Error loading exercises: {e}")
            
    conn.close()

def return_title():
    conn = sqlite3.connect(DB_PATH)
    cursor = conn.cursor()
    cursor.execute("SELECT id, titre, niveau FROM code")
    rows = cursor.fetchall()
    conn.close()
    return [{"id" : v[0], "title" : v[1].replace("\n",""), "niveau":v[2]} for v in rows]

def return_exercise(id):
    conn = sqlite3.connect(DB_PATH)
    cursor = conn.cursor()
    cursor.execute("SELECT * FROM code WHERE id = ?", (id,))
    rows = cursor.fetchall()
    conn.close()
    if not rows:
        return None
    return rows[0]

def return_mot_cle():
    conn = sqlite3.connect(DB_PATH)
    cursor = conn.cursor()
    cursor.execute("SELECT id, mots_cle FROM code")
    rows = cursor.fetchall()
    conn.close()
    return [{"id" : v[0], "mot_cle" : v[1].replace("\n","")} for v in rows]

def return_niveau():
    conn = sqlite3.connect(DB_PATH)
    cursor = conn.cursor()
    cursor.execute("SELECT id, niveau FROM code")
    rows = cursor.fetchall()
    conn.close()
    return [{"id" : v[0], "niveau" : v[1]} for v in rows]

def raffle_exercise(niveau, include_terminale=False):
    import random
    conn = sqlite3.connect(DB_PATH)
    cursor = conn.cursor()
    
    query = "SELECT id FROM code WHERE niveau = ?"
    params = [int(niveau)]
    
    if not include_terminale:
        query += " AND titre NOT LIKE '(T) %'"
        
    cursor.execute(query, tuple(params))
    rows = cursor.fetchall()
    import logging
    logging.info(f"raffle_exercise: niveau={niveau}, include_terminale={include_terminale}, query={query}, params={params}, found {len(rows)} candidates")
    conn.close()
    if not rows:
        return None
    choice = random.choice(rows)[0]
    return choice

def raffle_exercises(niveau, count=3, include_terminale=False):
    import random
    conn = sqlite3.connect(DB_PATH)
    cursor = conn.cursor()
    
    query = "SELECT id FROM code"
    params = []
    
    conditions = []
    if niveau != 0:
        conditions.append("niveau = ?")
        params.append(int(niveau))
        
    if not include_terminale:
        conditions.append("titre NOT LIKE '(T) %'")
        
    if conditions:
        query += " WHERE " + " AND ".join(conditions)
        
    cursor.execute(query, tuple(params))
    rows = cursor.fetchall()
    conn.close()
    if not rows:
        return []
    
    # Get random sample, but ensure it doesn't exceed available exercises
    actual_count = min(len(rows), count)
    choices = random.sample(rows, actual_count)
    return [c[0] for c in choices]

def create_multiplayer_game(niveau, include_terminale=False):
    import string
    import random
    game_code = ''.join(random.choices(string.ascii_uppercase + string.digits, k=6))
    exo_id = raffle_exercise(niveau, include_terminale)
    if not exo_id:
        import logging
        logging.warning(f'create_multiplayer_game: raffle_exercise returned None for level {niveau}')
        return None
    try:
        conn = sqlite3.connect(DB_PATH)
        cursor = conn.cursor()
        cursor.execute("INSERT INTO multiplayer_sessions (game_code, exercise_id, status, winner, include_terminale) VALUES (?, ?, ?, ?, ?)", 
                       (game_code, exo_id, 'open', None, include_terminale))
        conn.commit()
        conn.close()
        return game_code
    except Exception as e:
        print(f"Database error: {e}")
        return None

def get_multiplayer_game(game_code):
    conn = sqlite3.connect(DB_PATH)
    cursor = conn.cursor()
    cursor.execute("SELECT exercise_id, status, winner FROM multiplayer_sessions WHERE game_code = ?", (game_code,))
    row = cursor.fetchone()
    conn.close()
    return row

def add_player_to_game(game_code, username):
    conn = sqlite3.connect(DB_PATH)
    cursor = conn.cursor()
    cursor.execute("INSERT OR IGNORE INTO multiplayer_players (game_code, username) VALUES (?, ?)", (game_code, username))
    conn.commit()
    conn.close()

def remove_player_from_game(game_code, username):
    conn = sqlite3.connect(DB_PATH)
    cursor = conn.cursor()
    cursor.execute("DELETE FROM multiplayer_players WHERE game_code = ? AND username = ?", (game_code, username))
    conn.commit()
    conn.close()

def get_game_players(game_code):
    conn = sqlite3.connect(DB_PATH)
    cursor = conn.cursor()
    cursor.execute("SELECT username FROM multiplayer_players WHERE game_code = ? ORDER BY joined_at ASC", (game_code,))
    rows = cursor.fetchall()
    conn.close()
    import logging
    players_list = [r[0] for r in rows]
    logging.info(f"DEBUG: Players in {game_code}: {players_list}")
    return players_list

def start_multiplayer_game_in_db(game_code):
    conn = sqlite3.connect(DB_PATH)
    cursor = conn.cursor()
    cursor.execute("UPDATE multiplayer_sessions SET status = 'active' WHERE game_code = ?", (game_code,))
    conn.commit()
    conn.close()

def set_multiplayer_winner(game_code, username):
    conn = sqlite3.connect(DB_PATH)
    cursor = conn.cursor()
    cursor.execute("SELECT winner FROM multiplayer_sessions WHERE game_code = ?", (game_code,))
    row = cursor.fetchone()
    if row and row[0]: # Already has a winner
        return row[0]
    cursor.execute("UPDATE multiplayer_sessions SET winner = ?, status = 'finished' WHERE game_code = ?", (username, game_code))
    conn.commit()
    conn.close()
    return username

def replay_multiplayer_game(game_code):
    import random
    conn = sqlite3.connect(DB_PATH)
    cursor = conn.cursor()
    cursor.execute("SELECT exercise_id, include_terminale FROM multiplayer_sessions WHERE game_code = ?", (game_code,))
    row = cursor.fetchone()
    if not row:
        conn.close()
        return None
    
    exercise_id = row[0]
    include_terminale = bool(row[1]) if len(row) > 1 and row[1] is not None else False
    
    cursor.execute("SELECT niveau FROM code WHERE id = ?", (exercise_id,))
    niveau_row = cursor.fetchone()
    niveau = niveau_row[0] if niveau_row else 1
    
    query = "SELECT id FROM code WHERE niveau = ? AND id != ?"
    params = [int(niveau), exercise_id]
    
    if not include_terminale:
        query += " AND titre NOT LIKE '(T) %'"
        
    cursor.execute(query, tuple(params))
    rows = cursor.fetchall()
    
    if not rows:
        query2 = "SELECT id FROM code WHERE niveau = ?"
        params2 = [int(niveau)]
        if not include_terminale:
            query2 += " AND titre NOT LIKE '(T) %'"
        cursor.execute(query2, tuple(params2))
        rows = cursor.fetchall()
        
    new_exo_id = random.choice(rows)[0] if rows else exercise_id
    
    cursor.execute("UPDATE multiplayer_sessions SET exercise_id = ?, status = 'active', winner = NULL WHERE game_code = ?", (new_exo_id, game_code))
    conn.commit()
    conn.close()
    return new_exo_id

def create_br_game(niveau, include_terminale=False):
    import string
    import random
    game_code = ''.join(random.choices(string.ascii_uppercase + string.digits, k=6))
    exo_id = raffle_exercise(niveau, include_terminale)
    if not exo_id:
        import logging
        logging.warning(f'create_multiplayer_game: raffle_exercise returned None for level {niveau}')
        return None
    try:
        conn = sqlite3.connect(DB_PATH)
        cursor = conn.cursor()
        import json
        used_exercises = json.dumps([exo_id])
        cursor.execute("INSERT INTO br_sessions (game_code, niveau, status, current_exercise_id, used_exercises, include_terminale) VALUES (?, ?, 'open', ?, ?, ?)", 
                       (game_code, niveau, exo_id, used_exercises, include_terminale))
        conn.commit()
        conn.close()
        return game_code
    except Exception as e:
        print(f"Database error: {e}")
        return None

def get_br_game(game_code):
    conn = sqlite3.connect(DB_PATH)
    cursor = conn.cursor()
    cursor.execute("SELECT niveau, status, winner, current_exercise_id, used_exercises, round_start_time, round_end_time FROM br_sessions WHERE game_code = ?", (game_code,))
    row = cursor.fetchone()
    conn.close()
    return row

def add_player_to_br(game_code, username):
    conn = sqlite3.connect(DB_PATH)
    cursor = conn.cursor()
    cursor.execute("INSERT OR IGNORE INTO br_players (game_code, username, state) VALUES (?, ?, 'playing')", (game_code, username))
    conn.commit()
    conn.close()

def remove_player_from_br(game_code, username):
    conn = sqlite3.connect(DB_PATH)
    cursor = conn.cursor()
    cursor.execute("DELETE FROM br_players WHERE game_code = ? AND username = ?", (game_code, username))
    conn.commit()
    conn.close()

def get_br_players(game_code):
    conn = sqlite3.connect(DB_PATH)
    cursor = conn.cursor()
    cursor.execute("SELECT username, state FROM br_players WHERE game_code = ? ORDER BY joined_at ASC", (game_code,))
    rows = cursor.fetchall()
    conn.close()
    return [{"username": r[0], "state": r[1]} for r in rows]

def start_br_round(game_code):
    from datetime import datetime
    conn = sqlite3.connect(DB_PATH)
    cursor = conn.cursor()
    # Récupérer la session actuelle
    cursor.execute("SELECT niveau, used_exercises, include_terminale FROM br_sessions WHERE game_code = ?", (game_code,))
    row = cursor.fetchone()
    if not row:
        conn.close()
        return False
        
    niveau = row[0]
    import json
    used_exercises = json.loads(row[1]) if row[1] else []
    include_terminale = bool(row[2]) if len(row) > 2 and row[2] is not None else False
    
    # Choisir un nouvel exercice qui n'a pas été utilisé
    query = "SELECT id FROM code WHERE niveau = ?"
    params = [int(niveau)]
    if not include_terminale:
        query += " AND titre NOT LIKE '(T) %'"
        
    cursor.execute(query, tuple(params))
    all_exos = [r[0] for r in cursor.fetchall()]
    available_exos = list(set(all_exos) - set(used_exercises))
    
    import random
    if available_exos:
        new_exo_id = random.choice(available_exos)
    else:
        # Si tous les exos ont été faits, on reset la liste (ou on garde le dernier)
        new_exo_id = random.choice(all_exos) if all_exos else 1
        used_exercises = []
        
    used_exercises.append(new_exo_id)
    
    # Temps imparti en fonction du niveau
    time_limits = {1: 120, 2: 300, 3: 540, 4: 900}
    limit_seconds = time_limits.get(niveau, 120)
    
    now = datetime.now()
    # Reset l'état des joueurs qualifiés uniquement (ceux éliminés restent éliminés)
    cursor.execute("UPDATE br_players SET state = 'playing' WHERE game_code = ? AND state = 'qualified'", (game_code,))
    # On gère l'initialisation depuis 'open' 
    cursor.execute("UPDATE br_players SET state = 'playing' WHERE game_code = ? AND state = 'open'", (game_code,)) # if any
    
    cursor.execute("""
        UPDATE br_sessions 
        SET status = 'active', 
            current_exercise_id = ?, 
            used_exercises = ?,
            round_start_time = ?,
            round_end_time = NULL
        WHERE game_code = ?
    """, (new_exo_id, json.dumps(used_exercises), now.isoformat(), game_code))
    
    conn.commit()
    conn.close()
    return True

def qualify_br_player(game_code, username):
    conn = sqlite3.connect(DB_PATH)
    cursor = conn.cursor()
    cursor.execute("UPDATE br_players SET state = 'qualified' WHERE game_code = ? AND username = ?", (game_code, username))
    conn.commit()
    
    # Vérifier si on doit clore le tour (il reste 1 seul joueur en 'playing')
    cursor.execute("SELECT username FROM br_players WHERE game_code = ? AND state = 'playing'", (game_code,))
    remaining_playing = cursor.fetchall()
    
    round_ended = False
    if len(remaining_playing) == 1:
        # Le dernier joueur est éliminé
        cursor.execute("UPDATE br_players SET state = 'eliminated_this_round' WHERE game_code = ? AND username = ?", (game_code, remaining_playing[0][0]))
        conn.commit()
        round_ended = True
    elif len(remaining_playing) == 0:
        # Tout le monde s'est qualifié dans la même seconde ? Ou joueur solo
        round_ended = True
        
    if round_ended:
        from datetime import datetime
        cursor.execute("UPDATE br_sessions SET status = 'round_end', round_end_time = ? WHERE game_code = ?", (datetime.now().isoformat(), game_code))
        conn.commit()
        
    conn.close()
    return round_ended

def check_br_time_limit(game_code):
    from datetime import datetime
    conn = sqlite3.connect(DB_PATH)
    cursor = conn.cursor()
    cursor.execute("SELECT niveau, round_start_time, status FROM br_sessions WHERE game_code = ?", (game_code,))
    row = cursor.fetchone()
    
    if not row or row[2] != 'active' or not row[1]:
        conn.close()
        return False
        
    niveau = row[0]
    start_time_str = row[1]
    
    try:
        start_time = datetime.fromisoformat(start_time_str)
    except:
        conn.close()
        return False
        
    time_limits = {1: 120, 2: 300, 3: 540, 4: 900}
    limit_seconds = time_limits.get(niveau, 120)
    
    now = datetime.now()
    elapsed = (now - start_time).total_seconds()
    
    if elapsed >= limit_seconds:
        # Le temps est écoulé, tous ceux encore en 'playing' sont éliminés
        cursor.execute("UPDATE br_players SET state = 'eliminated_this_round' WHERE game_code = ? AND state = 'playing'", (game_code,))
        cursor.execute("UPDATE br_sessions SET status = 'round_end', round_end_time = ? WHERE game_code = ?", (now.isoformat(), game_code))
        conn.commit()
        conn.close()
        return True
        
    conn.close()
    return False

def process_br_round_end(game_code):
    from datetime import datetime
    conn = sqlite3.connect(DB_PATH)
    cursor = conn.cursor()
    cursor.execute("SELECT status, round_end_time FROM br_sessions WHERE game_code = ?", (game_code,))
    row = cursor.fetchone()
    
    if not row or row[0] != 'round_end' or not row[1]:
        conn.close()
        return None
        
    try:
        end_time = datetime.fromisoformat(row[1])
    except:
        conn.close()
        return None
        
    now = datetime.now()
    elapsed = (now - end_time).total_seconds()
    
    if elapsed >= 10:
        # 10 secondes écoulées, on passe au tour suivant (ou on termine la partie)
        # 1. On passe les 'eliminated_this_round' en 'eliminated'
        cursor.execute("UPDATE br_players SET state = 'eliminated' WHERE game_code = ? AND state = 'eliminated_this_round'", (game_code,))
        conn.commit()
        
        # 2. Vérifier combien de qualifiés il reste
        cursor.execute("SELECT username FROM br_players WHERE game_code = ? AND state = 'qualified'", (game_code,))
        qualified = [r[0] for r in cursor.fetchall()]
        
        if len(qualified) <= 1:
            # Fin de la partie
            winner = qualified[0] if len(qualified) == 1 else None
            cursor.execute("UPDATE br_sessions SET status = 'finished', winner = ? WHERE game_code = ?", (winner, game_code))
            conn.commit()
            conn.close()
            return "finished"
        else:
            # Lancer le tour suivant
            conn.close()
            start_br_round(game_code)
            return "next_round"
            
    conn.close()
    return "waiting"