import requests
import sqlite3
import time
import schedule
from datetime import datetime

# --- Configuration ---
API_URL = "https://api.uexcorp.space/2.0/commodities_prices_all"
with open("uex_api_key", "r") as f:
    BEARER_TOKEN = f.read().strip()

DB_NAME = "commodities.db"
TABLE_NAME = "commodity_prices"

def setup_database():
    """
    Sets up the SQLite database and creates the table if it doesn't exist.
    The table uses a composite primary key (id_commodity, id_terminal)
    to ensure each commodity at each terminal has only one latest entry.
    """
    conn = sqlite3.connect(DB_NAME)
    cursor = conn.cursor()

    # Using "IF NOT EXISTS" prevents errors on subsequent runs.
    # The schema is derived from your provided image.
    # We use INSERT OR REPLACE later, so a primary key is important.
    # (id_commodity, id_terminal) is a good candidate for a unique key.
    cursor.execute(f'''
    CREATE TABLE IF NOT EXISTS {TABLE_NAME} (
        id INTEGER,
        id_commodity INTEGER,
        id_terminal INTEGER,
        price_buy REAL,
        price_buy_avg REAL,
        price_sell REAL,
        price_sell_avg REAL,
        scu_buy REAL,
        scu_buy_avg REAL,
        scu_sell_stock REAL,
        scu_sell_stock_avg REAL,
        scu_sell REAL,
        scu_sell_avg REAL,
        status_buy INTEGER,
        status_sell INTEGER,
        date_added INTEGER,
        date_modified INTEGER,
        commodity_name TEXT,
        commodity_code TEXT,
        commodity_slug TEXT,
        terminal_name TEXT,
        terminal_code TEXT,
        terminal_slug TEXT,
        PRIMARY KEY (id_commodity, id_terminal)
    )
    ''')

    conn.commit()
    conn.close()
    print("Database setup complete. Table 'commodity_prices' is ready.")

def fetch_data_from_api():
    """
    Fetches the latest commodity data from the UAX Corp API.
    Returns the data as a list of dictionaries or None if an error occurs.
    """
    headers = {
        "Authorization": f"Bearer {BEARER_TOKEN}"
    }
    try:
        response = requests.get(API_URL, headers=headers)
        # Raise an exception for bad status codes (4xx or 5xx)
        response.raise_for_status()

        data = response.json()
        if 'data' in data:
            return data['data']
        else:
            # Handle cases where the structure might be flat
            return data

    except requests.exceptions.RequestException as e:
        print(f"Error fetching data from API: {e}")
        return None

def save_data_to_db(data):
    """
    Saves the fetched data into the SQLite database.
    Uses 'INSERT OR REPLACE' to update existing records for a
    commodity/terminal pair or insert new ones.
    """
    if not data:
        print("No data to save.")
        return

    conn = sqlite3.connect(DB_NAME)
    cursor = conn.cursor()

    # Prepare data for insertion
    records_to_insert = []
    for item in data:
        # The order of values must match the table schema
        records_to_insert.append((
            item.get('id'),
            item.get('id_commodity'),
            item.get('id_terminal'),
            item.get('price_buy'),
            item.get('price_buy_avg'),
            item.get('price_sell'),
            item.get('price_sell_avg'),
            item.get('scu_buy'),
            item.get('scu_buy_avg'),
            item.get('scu_sell_stock'),
            item.get('scu_sell_stock_avg'),
            item.get('scu_sell'),
            item.get('scu_sell_avg'),
            item.get('status_buy'),
            item.get('status_sell'),
            item.get('date_added'),
            item.get('date_modified'),
            item.get('commodity_name'),
            item.get('commodity_code'),
            item.get('commodity_slug'),
            item.get('terminal_name'),
            item.get('terminal_code'),
            item.get('terminal_slug')
        ))

    # Using executemany is much more efficient than one by one
    sql_statement = f'''
    INSERT OR REPLACE INTO {TABLE_NAME} (
        id, id_commodity, id_terminal, price_buy, price_buy_avg, price_sell,
        price_sell_avg, scu_buy, scu_buy_avg, scu_sell_stock, scu_sell_stock_avg,
        scu_sell, scu_sell_avg, status_buy, status_sell, date_added, date_modified,
        commodity_name, commodity_code, commodity_slug, terminal_name, terminal_code,
        terminal_slug
    ) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
    '''

    cursor.executemany(sql_statement, records_to_insert)

    conn.commit()
    conn.close()

    print(f"Successfully saved/updated {len(records_to_insert)} records to the database.")

def job():
    """The main job function to be scheduled."""
    print(f"--- Running job at {datetime.now().strftime('%Y-%m-%d %H:%M:%S')} ---")
    api_data = fetch_data_from_api()
    if api_data:
        save_data_to_db(api_data)
    print("--- Job finished ---")

if __name__ == "__main__":
    # 1. Set up the database and table on the first run.
    setup_database()

    # 2. Run the job immediately once when the script starts.
    job()

    # 3. Schedule the job to run every hour.
    print(f"Scheduling job to run every hour. Press Ctrl+C to exit.")
    schedule.every().hour.do(job)

    # 4. Run the scheduler loop.
    while True:
        schedule.run_pending()
        time.sleep(1)