import traceback
import os
from pathlib import Path
from fastapi import FastAPI, Request, HTTPException, Response
from fastapi.templating import Jinja2Templates
from fastapi.responses import HTMLResponse
from prometheus_client import Counter, Histogram, generate_latest, CONTENT_TYPE_LATEST
import time
import logging
import markdown

from routes import router as routes_app

logging.basicConfig(level=logging.INFO)
logger = logging.getLogger(__name__)

app = FastAPI(title="DevOps Windows API", description="Application de démonstration DevOps sous Windows", version="1.0.0")

# 🔹 Utilise un chemin absolu pour le dossier templates
BASE_DIR = Path(__file__).resolve().parent
templates = Jinja2Templates(directory=str(BASE_DIR / "templates"))

app.include_router(routes_app, prefix="/users", tags=["users"])

REQUEST_COUNT = Counter('http_requests_total', 'Total des requêtes HTTP', ['method', 'endpoint', 'status'])
REQUEST_LATENCY = Histogram('http_request_duration_seconds', 'Temps de réponse HTTP', ['method', 'endpoint'])

@app.middleware("http")
async def monitor_requests(request: Request, call_next):
    start_time = time.time()
    try:
        response = await call_next(request)
        status_code = str(response.status_code)
    except Exception as e:
        status_code = "500"
        response = Response(content=f"Erreur serveur : {str(e)}", status_code=500)
    process_time = time.time() - start_time
    REQUEST_COUNT.labels(method=request.method, endpoint=request.url.path, status=status_code).inc()
    REQUEST_LATENCY.labels(method=request.method, endpoint=request.url.path).observe(process_time)
    response.headers["X-Process-Time"] = f"{process_time:.3f}s"
    return response

@app.get("/", response_class=HTMLResponse)
async def home(request: Request):
    md_file_path = "/app/readme.md"   
    try:
        with open(md_file_path, "r", encoding="utf-8") as f:
            md_content = f.read()
        html_content = markdown.markdown(md_content)
    except Exception as e:
        html_content = f"<h3>Erreur de lecture du fichier :</h3><pre>{traceback.format_exc()}</pre>"

    header_banner = "🚀 <strong>$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$ DevOps Stack Windows - Fonctionnel ! $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$</strong>"

    try:
        return templates.TemplateResponse("index.html", {
            "request": request,
            "header": header_banner,
            "content": html_content
        })
    except Exception as e:
        return HTMLResponse(f"<h3>Erreur de template :</h3><pre>{traceback.format_exc()}</pre>", status_code=500)

@app.get("/health")
async def health(): return {"status": "healthy", "timestamp": time.time(), "service": "devops-app"}

@app.get("/metrics")
async def metrics():
    try: return Response(content=generate_latest(), media_type=CONTENT_TYPE_LATEST)
    except Exception as e: raise HTTPException(status_code=500, detail="Échec des métriques")

@app.get("/info")
async def info(): return {
    "python_version": "3.11", "platform": "windows", "service": "FastAPI DevOps",
    "features": ["docker", "kubernetes", "monitoring", "ci-cd"]
}

@app.get("/env")
async def show_env(): return {"ENV": os.getenv("ENV", "not-set"), "HOSTNAME": os.getenv("HOSTNAME", "not-set")}