import os
import hashlib
import json
import requests
import subprocess
from datetime import datetime, timedelta
from flask import Flask, jsonify, Response, request

BASE_API = "https://ws1.smn.gob.ar"
CACHE_DIR = "json.api.cache"
CACHE_TTL = timedelta(minutes=30)
SMN_TOKEN_FILE = "token.txt"
ACCESS_TOKEN = "i.hate.smn"

app = Flask(__name__)

def get_cache_filename(url: str) -> str:
    h = hashlib.sha256(url.encode()).hexdigest()
    return os.path.join(CACHE_DIR, f"{h}.json")

def load_cache(url: str):
    path = get_cache_filename(url)
    if not os.path.exists(path):
        return None
    mtime = datetime.fromtimestamp(os.path.getmtime(path))
    if datetime.now() - mtime > CACHE_TTL:
        return None
    with open(path, "r", encoding="utf-8") as f:
        return json.load(f)

def save_cache(url: str, data: dict):
    os.makedirs(CACHE_DIR, exist_ok=True)
    path = get_cache_filename(url)
    with open(path, "w", encoding="utf-8") as f:
        json.dump(data, f, indent=2, ensure_ascii=False)

def load_smn_token():
    with open(SMN_TOKEN_FILE, "r") as f:
        return f.read().strip()

def refresh_smn_token():
    print("[TOKEN] Refreshing SMN token...")
    try:
        result = subprocess.run(
            ["python3", "tokenext.py"], # cheap as fuck, fixing later
            capture_output=True,
            text=True,
            timeout=60
        )
        if result.returncode == 0:
            print("[TOKEN] Token refreshed successfully.")
        else:
            print("[TOKEN] Failed to refresh token:", result.stderr)
    except Exception as e:
        print("[TOKEN] Error running tokenext.py:", e)

def check_access_token():
    header_token = request.headers.get("Authorization", "").strip()
    return header_token == ACCESS_TOKEN

def fetch_from_smn(url: str, retry: bool = True):
    token = load_smn_token()
    headers = {
        "Authorization": f"JWT {token}",
        "Accept": "application/json",
        "User-Agent": "Mozilla/5.0"
    }

    resp = requests.get(url, headers=headers)

    if resp.status_code == 401 and retry:
        print("[AUTH] SMN token expired, trying to refresh...")
        refresh_smn_token()
        return fetch_from_smn(url, retry=False)

    return resp

@app.route("/smn/<path:subpath>")
def smn_proxy(subpath):
    if not check_access_token():
        return jsonify({"error": "Unauthorized"}), 401

    url = f"{BASE_API}/{subpath}"

    # Check cache
    cached = load_cache(url)
    if cached:
        print(f"[CACHE] Loaded {subpath}")
        return jsonify(cached)

    print(f"[FETCH] {url}")
    resp = fetch_from_smn(url)

    if resp.status_code != 200:
        return Response(
            resp.text,
            status=resp.status_code,
            content_type=resp.headers.get("Content-Type", "text/plain")
        )

    data = resp.json()
    save_cache(url, data)
    return jsonify(data)

if __name__ == "__main__":
    os.makedirs(CACHE_DIR, exist_ok=True)
    app.run(host="0.0.0.0", port=8080, debug=False)