from fastapi import FastAPI
from fastapi.staticfiles import StaticFiles
from fastapi.responses import HTMLResponse, RedirectResponse
from config import EPT_DIR
from routes import upload, viewer, admin
from utils.disk import get_disk_usage, get_entwine_path
import subprocess

ENTWINE_PATH = get_entwine_path()

app = FastAPI(title="PointCloud Backend")
app.mount("/ept_data", StaticFiles(directory=str(EPT_DIR)), name="ept_data")
app.mount("/static", StaticFiles(directory="static"), name="static")

app.include_router(upload.router)
app.include_router(viewer.router)
app.include_router(admin.router)

@app.get("/api")
def home():
    return RedirectResponse(url="/docs")

@app.get("/health")
def health():
    return {
        "ok": True,
        "entwine_available": ENTWINE_PATH is not None,
        "entwine_path": ENTWINE_PATH,
        "disk_free_gb": get_disk_usage(),
    }

def get_pdal_info() -> dict:
    """Retourne version et path de pdal via subprocess."""
    info = {"path": None, "version": None}
    
    try:
        result = subprocess.run(
            ["which", "pdal"],
            capture_output=True, text=True, check=False
        )
        if result.returncode == 0:
            info["path"] = result.stdout.strip()
    except Exception:
        pass
    
    try:
        result = subprocess.run(
            ["pdal", "--version"],
            capture_output=True, text=True, check=False
        )
        if result.returncode == 0:
            # Sortie : "---\npdal 2.10.0 (git-version: 22e6b2)\n---"
            lines = [l.strip() for l in result.stdout.strip().splitlines()
                     if l.strip() and not l.startswith("-")]
            if lines:
                info["version"] = lines[0]
    except Exception:
        pass
    
    return info


@app.get("/", response_class=HTMLResponse)
def home():
    entwine_path = get_entwine_path()
    pdal = get_pdal_info()

    return f"""
    <h2>Backend PointCloud OK ✅</h2>
    <ul>
      <li><a href="/docs">/docs</a> — Documentation API</li>
      <li><a href="/health">/health</a> — État du service</li>
      <li><a href="/list">/list</a> — Liste des nuages</li>
    </ul>
    <h3>Configuration</h3>
    <ul>
      <li>entwine : {"✅ " + entwine_path if entwine_path else "❌ Non trouvé"}</li>
      <li>pdal path : {"✅ " + pdal["path"] if pdal["path"] else "❌ Non trouvé"}</li>
      <li>pdal version : {pdal["version"] if pdal["version"] else "❌ Inconnue"}</li>
      <li>Espace disque : {get_disk_usage()} GB libres</li>
    </ul>
    """