from flask import Flask, request, jsonify

app = Flask(__name__)

current_term = 0
voted_for = None
log = []

@app.route('/requestVote', methods=['POST'])
def request_vote():
    try:
        global current_term, voted_for
        data = request.get_json()
        if data["term"] > current_term:
            current_term = data["term"]
            voted_for = None
        if voted_for is None or voted_for == data["candidateId"]:
            last_log_index = len(log) - 1
            last_log_term = log[-1]["term"] if log else 0
            if data["lastLogTerm"] > last_log_term or (data["lastLogTerm"] == last_log_term and data["lastLogIndex"] >= last_log_index):
                voted_for = data["candidateId"]
                response = {
                    "term": current_term,
                    "voteGranted": True
                }
            else:
                response = {
                    "term": current_term,
                    "voteGranted": False
                }
        else:
            response = {
                "term": current_term,
                "voteGranted": False
            }
        return jsonify(response), 200
    except:
        return jsonify({"message": "Error processing request"}), 400

@app.route('/appendEntries', methods=['POST'])
def append_entries():
    try:
        global current_term, log
        data = request.get_json()
        if data["term"] >= current_term:
            current_term = data["term"]
            if not log or data["prevLogIndex"] == len(log) - 1 and log[-1]["term"] == data["prevLogTerm"]:
                log = log[:data["prevLogIndex"] + 1] + data["entries"]
                response = {
                    "term": current_term,
                    "success": True
                }
            else:
                response = {
                    "term": current_term,
                    "success": False
                }
        else:
            response = {
                "term": current_term,
                "success": False
            }
        return jsonify(response), 200
    except:
        return jsonify({"message": "Error processing request"}), 400

if __name__ == '__main__':
    app.run(debug=True)