import os
from pathlib import Path
import sqlite3
from typing import Optional, Tuple

DB_PATH = os.path.join(os.getenv("CRAWL4_AI_BASE_DIRECTORY", Path.home()), ".crawl4ai")
os.makedirs(DB_PATH, exist_ok=True)
DB_PATH = os.path.join(DB_PATH, "crawl4ai.db")

def init_db():
    global DB_PATH
    conn = sqlite3.connect(DB_PATH)
    cursor = conn.cursor()
    cursor.execute('''
        CREATE TABLE IF NOT EXISTS crawled_data (
            url TEXT PRIMARY KEY,
            html TEXT,
            cleaned_html TEXT,
            markdown TEXT,
            extracted_content TEXT,
            success BOOLEAN,
            media TEXT DEFAULT "{}",
            links TEXT DEFAULT "{}",
            metadata TEXT DEFAULT "{}",
            screenshot TEXT DEFAULT ""
        )
    ''')
    conn.commit()
    conn.close()

def alter_db_add_screenshot(new_column: str = "media"):
    check_db_path()
    try:
        conn = sqlite3.connect(DB_PATH)
        cursor = conn.cursor()
        cursor.execute(f'ALTER TABLE crawled_data ADD COLUMN {new_column} TEXT DEFAULT ""')
        conn.commit()
        conn.close()
    except Exception as e:
        print(f"Error altering database to add screenshot column: {e}")

def check_db_path():
    if not DB_PATH:
        raise ValueError("Database path is not set or is empty.")

def get_cached_url(url: str) -> Optional[Tuple[str, str, str, str, str, str, str, bool, str]]:
    check_db_path()
    try:
        conn = sqlite3.connect(DB_PATH)
        cursor = conn.cursor()
        cursor.execute('SELECT url, html, cleaned_html, markdown, extracted_content, success, media, links, metadata, screenshot FROM crawled_data WHERE url = ?', (url,))
        result = cursor.fetchone()
        conn.close()
        return result
    except Exception as e:
        print(f"Error retrieving cached URL: {e}")
        return None

def cache_url(url: str, html: str, cleaned_html: str, markdown: str, extracted_content: str, success: bool, media : str = "{}", links : str = "{}", metadata : str = "{}", screenshot: str = ""):
    check_db_path()
    try:
        conn = sqlite3.connect(DB_PATH)
        cursor = conn.cursor()
        cursor.execute('''
            INSERT INTO crawled_data (url, html, cleaned_html, markdown, extracted_content, success, media, links, metadata, screenshot)
            VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
            ON CONFLICT(url) DO UPDATE SET
                html = excluded.html,
                cleaned_html = excluded.cleaned_html,
                markdown = excluded.markdown,
                extracted_content = excluded.extracted_content,
                success = excluded.success,
                media = excluded.media,      
                links = excluded.links,    
                metadata = excluded.metadata,      
                screenshot = excluded.screenshot
        ''', (url, html, cleaned_html, markdown, extracted_content, success, media, links, metadata, screenshot))
        conn.commit()
        conn.close()
    except Exception as e:
        print(f"Error caching URL: {e}")

def get_total_count() -> int:
    check_db_path()
    try:
        conn = sqlite3.connect(DB_PATH)
        cursor = conn.cursor()
        cursor.execute('SELECT COUNT(*) FROM crawled_data')
        result = cursor.fetchone()
        conn.close()
        return result[0]
    except Exception as e:
        print(f"Error getting total count: {e}")
        return 0

def clear_db():
    check_db_path()
    try:
        conn = sqlite3.connect(DB_PATH)
        cursor = conn.cursor()
        cursor.execute('DELETE FROM crawled_data')
        conn.commit()
        conn.close()
    except Exception as e:
        print(f"Error clearing database: {e}")
        
def flush_db():
    check_db_path()
    try:
        conn = sqlite3.connect(DB_PATH)
        cursor = conn.cursor()
        cursor.execute('DROP TABLE crawled_data')
        conn.commit()
        conn.close()
    except Exception as e:
        print(f"Error flushing database: {e}")

def update_existing_records(new_column: str = "media", default_value: str = "{}"):
    check_db_path()
    try:
        conn = sqlite3.connect(DB_PATH)
        cursor = conn.cursor()
        cursor.execute(f'UPDATE crawled_data SET {new_column} = "{default_value}" WHERE screenshot IS NULL')
        conn.commit()
        conn.close()
    except Exception as e:
        print(f"Error updating existing records: {e}")

if __name__ == "__main__":
    # Delete the existing database file
    if os.path.exists(DB_PATH):
        os.remove(DB_PATH)
    init_db()  
    # alter_db_add_screenshot("COL_NAME")