import sqlite3
import os
import hashlib
from typing import List, Dict, Any

DB_PATH = "/app/data/stock.db"

def _conn() -> sqlite3.Connection:
    os.makedirs(os.path.dirname(DB_PATH), exist_ok=True)
    conn = sqlite3.connect(DB_PATH)
    conn.row_factory = sqlite3.Row
    return conn

def init_db():
    with _conn() as conn:
        conn.execute("""
            CREATE TABLE IF NOT EXISTS articles (
                id INTEGER PRIMARY KEY AUTOINCREMENT,
                hash TEXT UNIQUE NOT NULL,
                title TEXT NOT NULL,
                link TEXT,
                summary TEXT,
                press TEXT,
                pub_date TEXT,
                crawled_at TEXT
            )
        """)
        conn.execute("CREATE INDEX IF NOT EXISTS idx_articles_crawled ON articles(crawled_at DESC)")

def save_articles(articles: List[Dict[str, str]]) -> int:
    count = 0
    with _conn() as conn:
        for a in articles:
            # 중복 체크용 해시 (제목+링크)
            unique_str = f"{a['title']}|{a['link']}"
            h = hashlib.md5(unique_str.encode()).hexdigest()
            
            try:
                conn.execute("""
                    INSERT INTO articles (hash, title, link, summary, press, pub_date, crawled_at)
                    VALUES (?, ?, ?, ?, ?, ?, ?)
                """, (h, a['title'], a['link'], a['summary'], a['press'], a['date'], a['crawled_at']))
                count += 1
            except sqlite3.IntegrityError:
                pass # 이미 존재함
    return count

def get_latest_articles(limit: int = 20) -> List[Dict[str, Any]]:
    with _conn() as conn:
        rows = conn.execute(
            "SELECT * FROM articles ORDER BY crawled_at DESC, id DESC LIMIT ?", 
            (limit,)
        ).fetchall()
        return [dict(r) for r in rows]