import os
import shutil
import logging
import tempfile
from fastapi import FastAPI, Request, File, UploadFile, Form
from fastapi.responses import HTMLResponse, RedirectResponse, FileResponse
from fastapi.templating import Jinja2Templates
from fastapi.staticfiles import StaticFiles

# Setup logging
logging.basicConfig(level=logging.INFO)
logger = logging.getLogger("overlay-manager")

# root_path ensures FastAPI knows it lives at /patch-manager/
app = FastAPI(root_path="/patch-manager")

os.makedirs("static", exist_ok=True)
app.mount("/static", StaticFiles(directory="static"), name="static")
templates = Jinja2Templates(directory="templates")

OVERLAY_DIR = "/srv"

@app.get("/", response_class=HTMLResponse)
async def index(request: Request):
    files = []
    dirs = set([""])
    if os.path.exists(OVERLAY_DIR):
        for root, dirnames, filenames in os.walk(OVERLAY_DIR):
            rel_root = os.path.relpath(root, OVERLAY_DIR)
            if rel_root != ".":
                dirs.add(rel_root)
            for filename in filenames:
                rel_path = os.path.relpath(os.path.join(root, filename), OVERLAY_DIR)
                files.append(rel_path)
                
    return templates.TemplateResponse("index.html", {
        "request": request, 
        "files": sorted(files),
        "dirs": sorted(list(dirs))
    })

@app.get("/download-all")
async def download_all():
    """Zips the entire /srv directory and serves it as a backup."""
    with tempfile.TemporaryDirectory() as tmpdir:
        zip_base = os.path.join(tmpdir, "backup")
        shutil.make_archive(zip_base, 'zip', OVERLAY_DIR)
        return FileResponse(
            path=f"{zip_base}.zip", 
            filename="ardupilot_overlays_backup.zip",
            media_type='application/zip'
        )

@app.post("/upload")
async def upload_file(file: UploadFile = File(...), target_path: str = Form("")):
    save_dir = os.path.join(OVERLAY_DIR, target_path.strip("/"))
    os.makedirs(save_dir, exist_ok=True)
    file_location = os.path.join(save_dir, file.filename)
    with open(file_location, "wb+") as file_object:
        shutil.copyfileobj(file.file, file_object)
    return RedirectResponse(url="./", status_code=303)

@app.post("/create_folder")
async def create_folder(folder_path: str = Form(...)):
    save_dir = os.path.join(OVERLAY_DIR, folder_path.strip("/"))
    os.makedirs(save_dir, exist_ok=True)
    return RedirectResponse(url="./", status_code=303)

@app.post("/delete")
async def delete_file(filepath: str = Form(...)):
    target = os.path.join(OVERLAY_DIR, filepath.lstrip("/"))
    if os.path.exists(target):
        if os.path.isdir(target):
            shutil.rmtree(target)
        else:
            os.remove(target)
    return RedirectResponse(url="./", status_code=303)

@app.get("/edit", response_class=HTMLResponse)
async def edit_file(request: Request, filepath: str):
    clean_path = filepath.lstrip("/")
    target = os.path.join(OVERLAY_DIR, clean_path)
    logger.info(f"Attempting to edit: {target}")

    if not os.path.exists(target):
        return HTMLResponse(content=f"<h1>404 Not Found</h1><p>File {target} missing.</p><a href='./'>Back</a>", status_code=404)

    try:
        with open(target, "r", encoding="utf-8", errors="ignore") as f:
            content = f.read()
    except Exception as e:
        return HTMLResponse(content=f"<h1>Error</h1><p>{str(e)}</p>", status_code=500)

    return templates.TemplateResponse("edit.html", {
        "request": request, 
        "filepath": filepath, 
        "content": content
    })

@app.post("/edit")
async def save_file(filepath: str = Form(...), content: str = Form(...)):
    target = os.path.join(OVERLAY_DIR, filepath.lstrip("/"))
    if os.path.exists(target):
        with open(target, "w", encoding="utf-8") as f:
            f.write(content)
    return RedirectResponse(url="./", status_code=303)