import os
import sqlite3
from flask import g
from pathlib import Path

class Database:
    def __init__(self, db_url):
        # Ensure the database directory exists
        db_path = self._parse_db_url(db_url)
        Path(db_path).parent.mkdir(parents=True, exist_ok=True)
        
        self.db_url = db_url
        self.conn = None

    def _parse_db_url(self, db_url):
        """Extract the file path from SQLite URL"""
        if db_url.startswith('sqlite:///'):
            return db_url[10:]  # Remove 'sqlite:///'
        return db_url

    def get_db(self):
        if not self.conn:
            try:
                self.conn = sqlite3.connect(self._parse_db_url(self.db_url))
                self.conn.row_factory = sqlite3.Row
                # Enable foreign key support
                self.conn.execute("PRAGMA foreign_keys = ON")
            except sqlite3.Error as e:
                print(f"Error connecting to database: {e}")
                raise
        return self.conn

    def close_db(self):
        if self.conn:
            try:
                self.conn.close()
            except sqlite3.Error as e:
                print(f"Error closing database: {e}")
            finally:
                self.conn = None

    def init_db(self):
        db = self.get_db()
        try:
            # Check if schema.sql exists in the correct path
            schema_path = os.path.join(os.path.dirname(__file__), 'schema.sql')
            if not os.path.exists(schema_path):
                raise FileNotFoundError(f"Schema file not found at {schema_path}")
                
            with open(schema_path, 'r') as f:
                db.cursor().executescript(f.read())
            db.commit()
        except Exception as e:
            print(f"Error initializing database: {e}")
            raise

    def cache_news(self, articles):
        db = self.get_db()
        try:
            for article in articles:
                db.execute('''
                    INSERT OR IGNORE INTO news 
                    (title, source, published, url, summary, content)
                    VALUES (?,?,?,?,?,?)
                ''', (
                    article.get('title', ''),
                    article.get('source', ''),
                    article.get('published', ''),
                    article.get('url', ''),
                    article.get('summary', ''),
                    article.get('content', '')
                ))
            db.commit()
        except sqlite3.Error as e:
            print(f"Error caching news: {e}")
            db.rollback()
            raise

    def get_cached_news(self):
        db = self.get_db()
        try:
            cur = db.execute('''
                SELECT * FROM news 
                ORDER BY published DESC 
                LIMIT 15
            ''')
            return [dict(row) for row in cur.fetchall()]
        except sqlite3.Error as e:
            print(f"Error fetching cached news: {e}")
            raise