import os
import redis
import hashlib
import itertools
from flask import Flask, request, jsonify
from flask_cors import CORS

app = Flask(__name__)
CORS(app)

# Configuration de Redis
redis_host = os.getenv("REDIS_HOST", "redis")
redis_port = int(os.getenv("REDIS_PORT", 6379))
redis_client = redis.StrictRedis(host=redis_host, port=redis_port, db=0, decode_responses=True)

# Clé pour le compteur de requêtes reçues
REQUEST_RECEIVED_KEY = "request_received_count"

# Initialisation du compteur si inexistant
if not redis_client.exists(REQUEST_RECEIVED_KEY):
    redis_client.set(REQUEST_RECEIVED_KEY, 0)


@app.before_request
def count_requests():
    """
    Middleware exécuté avant chaque requête pour incrémenter le compteur global de requêtes reçues.
    """
    redis_client.incr(REQUEST_RECEIVED_KEY)


@app.route("/health", methods=["GET"])
def health():
    """ Vérifie si l'application fonctionne correctement. """
    return jsonify({"status": "ok"}), 200


@app.route("/bruteforce", methods=["POST"])
def bruteforce():
    """
    Endpoint pour bruteforcer un hash MD5.
    """
    data = request.json
    if not data or "hash" not in data:
        return jsonify({
            "status": "fail",
            "data": None,
            "errors": {"message": "Invalid payload. Please provide a valid hash."}
        }), 400

    target_hash = data["hash"]

    # Vérifier si le hash existe déjà dans Redis
    if redis_client.exists(target_hash):
        original = redis_client.get(target_hash)
        return jsonify({
            "status": "success",
            "data": {"hash": target_hash, "original": original},
            "errors": None
        }), 200

    # Logique de brute-force
    charset = "abcdefghijklmnopqrstuvwxyz0123456789"
    for length in range(1, 8):
        for guess in itertools.product(charset, repeat=length):
            guess_str = ''.join(guess)
            if hashlib.md5(guess_str.encode()).hexdigest() == target_hash:
                redis_client.set(target_hash, guess_str)
                return jsonify({
                    "status": "success",
                    "data": {"hash": target_hash, "original": guess_str},
                    "errors": None
                }), 200

    return jsonify({
        "status": "fail",
        "data": None,
        "errors": {"message": "No match found."}
    }), 404


@app.route("/resolved", methods=["GET"])
def get_resolved_hashes():
    """
    Endpoint pour récupérer tous les hash résolus.
    """
    keys = redis_client.keys()
    resolved_hashes = {key: redis_client.get(key) for key in keys if key != REQUEST_RECEIVED_KEY}
    return jsonify({
        "status": "success",
        "data": resolved_hashes,
        "errors": None
    }), 200


@app.route("/resolved/<string:hash_value>", methods=["GET"])
def get_resolved_hash(hash_value):
    """
    Endpoint pour récupérer un hash spécifique.
    """
    if redis_client.exists(hash_value):
        original = redis_client.get(hash_value)
        return jsonify({
            "status": "success",
            "data": {"hash": hash_value, "original": original},
            "errors": None
        }), 200
    else:
        return jsonify({
            "status": "fail",
            "data": None,
            "errors": {"message": f"No resolved entry found for hash: {hash_value}"}
        }), 404


@app.route("/request_count", methods=["GET"])
def get_request_count():
    """
    Endpoint pour récupérer le nombre total de requêtes reçues.
    """
    count = redis_client.get(REQUEST_RECEIVED_KEY)
    return jsonify({
        "status": "success",
        "data": {"request_received_count": int(count) if count else 0},
        "errors": None
    }), 200


@app.route("/clear_cache", methods=["DELETE"])
def clear_cache():
    """
    Endpoint pour effacer toutes les entrées stockées dans Redis (sauf le compteur de requêtes).
    """
    keys = redis_client.keys()
    for key in keys:
        if key != REQUEST_RECEIVED_KEY:
            redis_client.delete(key)

    return jsonify({"status": "success", "message": "Cache cleared."}), 200


if __name__ == "__main__":
    app.run(host="0.0.0.0", port=5000)