# code/database.py
import sqlite3
from contextlib import contextmanager
# हम constants फाइल से पाथ और लॉक इम्पोर्ट कर रहे हैं
from core.constants import DATABASE_FILE, GLOBAL_DB_LOCK

@contextmanager
def get_db_cursor():
    conn = sqlite3.connect(DATABASE_FILE, check_same_thread=False)
    conn.row_factory = sqlite3.Row
    try:
        yield conn
        conn.commit()
    except Exception as e:
        conn.rollback()
        raise e
    finally:
        conn.close()

def init_db():
    with GLOBAL_DB_LOCK:
        with get_db_cursor() as conn:
            conn.execute('CREATE TABLE IF NOT EXISTS tasks (id TEXT PRIMARY KEY, status TEXT NOT NULL, progress INTEGER NOT NULL, log TEXT, output_filename TEXT)')

def create_task(task_id):
    log_message = "मिशन शुरू हो रहा...\n"
    with GLOBAL_DB_LOCK:
        with get_db_cursor() as conn:
            conn.execute('INSERT INTO tasks (id, status, progress, log) VALUES (?, ?, ?, ?)', (task_id, 'processing', 0, log_message))

def get_task(task_id):
    with GLOBAL_DB_LOCK:
        with get_db_cursor() as conn:
            return conn.execute('SELECT * FROM tasks WHERE id = ?', (task_id,)).fetchone()

def update_task_log(task_id, message, progress):
    with GLOBAL_DB_LOCK:
        with get_db_cursor() as conn:
            # First fetch current log
            current_row = conn.execute('SELECT log FROM tasks WHERE id = ?', (task_id,)).fetchone()
            if not current_row: return # Task not found
            
            current_log = current_row['log']
            new_log = current_log + message + "\n"
            conn.execute('UPDATE tasks SET log = ?, progress = ? WHERE id = ?', (new_log, progress, task_id))

def update_task_final_status(task_id, status, error_message=None, output_filename=None):
    with GLOBAL_DB_LOCK:
        with get_db_cursor() as conn:
            current_row = conn.execute('SELECT log FROM tasks WHERE id = ?', (task_id,)).fetchone()
            if not current_row: return
            
            current_log = current_row['log']
            
            if status == 'error':
                final_log = current_log + f"\n\n🚨 FATAL ERROR: {error_message}"
                conn.execute('UPDATE tasks SET status = ?, log = ? WHERE id = ?', (status, final_log, task_id))
            elif status == 'complete':
                final_log = current_log + "\n🎉 मिशन पूरा हुआ!"
                conn.execute('UPDATE tasks SET status = ?, progress = ?, output_filename = ?, log = ? WHERE id = ?', (status, 100, output_filename, final_log, task_id))