from fastapi import FastAPI, Depends, Request
from fastapi.staticfiles import StaticFiles
from fastapi.responses import HTMLResponse, JSONResponse
from starlette.middleware.sessions import SessionMiddleware
import logging
import os

from app.database import engine, Base, check_db_connection, log_db_startup_status
from app.database_maintenance import ensure_search_optimizations
from app.routers import orders, settings
from app.auth import router as auth_router

logging.basicConfig(level=logging.INFO)

APP_ROOT_PATH = os.getenv("APP_ROOT_PATH", "").rstrip("/")

# Verify DB connectivity at startup (log only — do not crash so the
# container can stay up and report status via /health/db).
log_db_startup_status()

# Create all DB tables
Base.metadata.create_all(bind=engine)
ensure_search_optimizations(engine)

app = FastAPI(title="Order Management System", root_path=APP_ROOT_PATH)


@app.get("/health/db")
async def health_db():
    ok, msg = check_db_connection()
    status_code = 200 if ok else 503
    return JSONResponse({"ok": ok, "detail": msg}, status_code=status_code)

# ---- Session middleware ----
# dbx-main 과 SSO 하려면 SESSION_SECRET_KEY 와 SESSION_COOKIE_NAME 을
# 두 앱이 동일하게 맞춰야 한다. 그래야 dbx-main 이 발급한 세션 쿠키를
# OMS 가 그대로 읽을 수 있다.
app.add_middleware(
    SessionMiddleware,
    secret_key=os.getenv("SESSION_SECRET_KEY", "super-secret-key"),
    session_cookie=os.getenv("SESSION_COOKIE_NAME", "session"),
    same_site=os.getenv("SESSION_SAME_SITE", "lax"),
    https_only=os.getenv("SESSION_HTTPS_ONLY", "0") == "1",
    max_age=int(os.getenv("SESSION_MAX_AGE", str(60 * 60 * 24 * 14))),  # 14d
)

# Include routers
app.include_router(auth_router)
app.include_router(orders.router, prefix="/api/orders", tags=["orders"])
app.include_router(settings.router, prefix="/api/settings", tags=["settings"])

# Mount static files for frontend
os.makedirs("static", exist_ok=True)
app.mount("/static", StaticFiles(directory="static"), name="static")

@app.get("/", response_class=HTMLResponse)
async def read_root():
    # Return the main index.html file
    if os.path.exists("static/index.html"):
        with open("static/index.html", "r", encoding="utf-8") as f:
            content = f.read()
            content = content.replace("__APP_BASE_PATH__", APP_ROOT_PATH)
            content = content.replace('src="/static/', f'src="{APP_ROOT_PATH}/static/' if APP_ROOT_PATH else 'src="/static/')
            content = content.replace('href="/static/', f'href="{APP_ROOT_PATH}/static/' if APP_ROOT_PATH else 'href="/static/')
            content = content.replace("window.location.href='/login", f"window.location.href='{APP_ROOT_PATH}/login")
            content = content.replace('window.location.href="/login', f'window.location.href="{APP_ROOT_PATH}/login')
            content = content.replace("window.location.href='/logout", f"window.location.href='{APP_ROOT_PATH}/logout")
            content = content.replace('window.location.href="/logout', f'window.location.href="{APP_ROOT_PATH}/logout')
            return HTMLResponse(content=content)
    return HTMLResponse(content="<h1>Welcome. static/index.html is missing.</h1>")