# db.py — 基础层：配置常量 + 数据库连接 + SQL 工具 + logger
# 被 helpers.py, routes.py, migrations/*, flask_app.py 共同依赖

import os
import sys
import json
import logging
from pathlib import Path
from datetime import datetime

import mysql.connector

# 确保 backend 目录在 sys.path 中（兼容 gunicorn --preload 模式）
_backend_dir = os.path.dirname(os.path.abspath(__file__))
if _backend_dir not in sys.path:
    sys.path.insert(0, _backend_dir)

logger = logging.getLogger(__name__)
logging.basicConfig(level=logging.INFO, format="%(asctime)s [%(levelname)s] %(message)s")

# ---------- 路径常量 ----------
ROOT = Path(__file__).resolve().parents[1]
DATA_DIR = ROOT / "data"
UPLOAD_DIR = DATA_DIR / "uploads"
DB_PATH = DATA_DIR / "opc.sqlite"

# ---------- 环境变量 ----------
try:
    from dotenv import load_dotenv
    load_dotenv(ROOT / ".env")
except ImportError:
    pass

WEIXIN_BASE = Path(os.environ.get("WEIXIN_BASE", "/Users/mac/天机阁/地阁/慰心斋"))

# 建目录
DATA_DIR.mkdir(parents=True, exist_ok=True)
UPLOAD_DIR.mkdir(parents=True, exist_ok=True)


# ---------- 数据库连接 ----------
def db():
    return mysql.connector.connect(
        host=os.environ.get("DB_HOST", "127.0.0.1"),
        port=int(os.environ.get("DB_PORT", "3306")),
        user=os.environ.get("DB_USER", "opc"),
        password=os.environ.get("DB_PASSWORD", "opc123456"),
        database=os.environ.get("DB_NAME", "opc"),
        charset="utf8mb4",
        collation="utf8mb4_unicode_ci",
    )


def now():
    return datetime.utcnow().isoformat()


def _exec(conn, sql, args=()):
    """执行 SQL，自动将 ? 转为 MySQL 的 %s"""
    cur = conn.cursor(dictionary=True)
    cur.execute(sql.replace("?", "%s"), args)
    return cur


def rows(conn, sql, args=()):
    cur = _exec(conn, sql, args)
    rows = cur.fetchall()
    cur.close()
    return rows


def one(conn, sql, args=()):
    cur = _exec(conn, sql, args)
    row = cur.fetchone()
    cur.close()
    return row