"""
===============================================================================
FILE: modules/web_api/main.py
PROJECT: SCUD Orion AI (Unified Repository)
MODULE: web_api (Main Application Entry Point)
ROLE: Инициализация FastAPI приложения, подключение роутеров и статики.
===============================================================================
"""

# ANCHOR[APP_INIT_IMPORTS]
import os
import sys
import logging

CURRENT_DIR = os.path.dirname(os.path.abspath(__file__))
if CURRENT_DIR not in sys.path:
    sys.path.insert(0, CURRENT_DIR)

from fastapi import FastAPI, HTTPException
from fastapi.staticfiles import StaticFiles
from fastapi.responses import FileResponse, JSONResponse
from fastapi.exceptions import RequestValidationError

from routers.auth import router as auth_router
from routers.admin import router as admin_router
from routers.tasks import router as tasks_router
from routers.chat import router as chat_router

# ANCHOR[APP_CONFIG]
logging.basicConfig(
    level=logging.INFO,
    format="%(asctime)s [%(levelname)s] %(message)s",
    handlers=[logging.StreamHandler()]
)

STATIC_DIR = os.path.join(CURRENT_DIR, "static")

app = FastAPI(title="SCUD Orion AI Context API", version="2.5")

if os.path.exists(STATIC_DIR):
    app.mount("/static", StaticFiles(directory=STATIC_DIR), name="static")

@app.exception_handler(RequestValidationError)
async def validation_exception_handler(request, exc):
    logging.error(f"❌ ОШИБКА ВАЛИДАЦИИ 422 НА {request.url}: {exc.errors()}")
    return JSONResponse(
        status_code=422,
        content={"detail": exc.errors(), "body": str(exc)}
    )

# ANCHOR[ROUTER_REGISTRATION]
app.include_router(auth_router)
app.include_router(admin_router)
app.include_router(tasks_router)
app.include_router(chat_router)

# ANCHOR[ROOT_STATIC_ROUTES]
@app.get("/")
def read_root():
    index_path = os.path.join(STATIC_DIR, "index.html")
    if os.path.exists(index_path):
        return FileResponse(index_path)
    raise HTTPException(status_code=404, detail="Frontend index.html not found")

@app.get("/favicon.ico")
async def favicon():
    file_path = os.path.join(STATIC_DIR, "favicon.ico")
    if os.path.exists(file_path):
        return FileResponse(file_path)
    raise HTTPException(status_code=404)

@app.get("/{file_path:path}")
def serve_static_fallback(file_path: str):
    clean_path = file_path.lstrip("/")
    target = os.path.join(STATIC_DIR, clean_path)
    if os.path.isfile(target):
        return FileResponse(target)

    filename = os.path.basename(clean_path)
    target_js = os.path.join(STATIC_DIR, "js", filename)
    if filename.endswith(".js") and os.path.isfile(target_js):
        return FileResponse(target_js, media_type="application/javascript")

    target_css = os.path.join(STATIC_DIR, "css", filename)
    if filename.endswith(".css") and os.path.isfile(target_css):
        return FileResponse(target_css, media_type="text/css")

    raise HTTPException(status_code=404, detail="File not found")