from fastapi import FastAPI, HTTPException, Form
from fastapi.responses import HTMLResponse
import os, json, uuid
from datetime import datetime

DATA = "/data/freqs.json"
app = FastAPI(redirect_slashes=False)

def load():
    if os.path.exists(DATA):
        with open(DATA) as f: return json.load(f)
    return {}

def save(d):
    with open(DATA, "w") as f: json.dump(d, f, indent=2)

@app.get("/api/list")
def list_freqs():
    items = load()
    return sorted(
        [{"id": k, **v} for k, v in items.items()],
        key=lambda x: (x.get("band", ""), float(x.get("freq", 0) or 0))
    )

@app.post("/api/add")
def add(freq: str = Form(""), name: str = Form(""), mode: str = Form(""),
        band: str = Form(""), tone: str = Form(""), offset: str = Form(""),
        description: str = Form(""), tag: str = Form("")):
    items = load()
    fid = uuid.uuid4().hex[:12]
    items[fid] = {
        "freq": freq, "name": name, "mode": mode, "band": band,
        "tone": tone, "offset": offset, "description": description,
        "tag": tag, "added": datetime.utcnow().isoformat()
    }
    save(items)
    return {"id": fid}

@app.patch("/api/update/{fid}")
def update(fid: str, freq: str = Form(None), name: str = Form(None),
           mode: str = Form(None), band: str = Form(None), tone: str = Form(None),
           offset: str = Form(None), description: str = Form(None), tag: str = Form(None)):
    items = load()
    if fid not in items: raise HTTPException(404)
    for k, v in {"freq": freq, "name": name, "mode": mode, "band": band,
                 "tone": tone, "offset": offset, "description": description, "tag": tag}.items():
        if v is not None: items[fid][k] = v
    save(items)
    return {"ok": True}

@app.delete("/api/delete/{fid}")
def delete(fid: str):
    items = load()
    if fid not in items: raise HTTPException(404)
    del items[fid]
    save(items)
    return {"ok": True}

@app.get("/", response_class=HTMLResponse)
def root():
    with open("/static/index.html") as f:
        return f.read()