import json
import requests

class SlackNotifier:
    def __init__(self, webhook_url):
        """
        Initializes the SlackNotifier with the webhook URL.

        :param webhook_url: The Slack webhook URL for sending messages.
        """
        self.webhook_url = webhook_url

    def send_message(self, text):
        """
        Sends a plain text message to Slack.

        :param text: The message to send.
        :raises: Exception if the message fails to send.
        """
        payload = {"text": text}
        
        response = requests.post(
            self.webhook_url,
            data=json.dumps(payload),
            headers={"Content-Type": "application/json"}
        )
        
        if response.status_code != 200:
            raise RuntimeError(f"Failed to send message to Slack: {response.status_code}, {response.text}")

    def send_candidate_info(self, name, email, years_of_experience, skills, performance_score=None):
        """
        Sends a formatted message with candidate information to Slack.

        :param name: Candidate's name.
        :param email: Candidate's email.
        :param years_of_experience: Total years of experience.
        :param skills: Candidate's skills.
        :param performance_score: Candidate's performance score (optional).
        """
        message = (
            f"*Candidate Assessment Report*\n\n"
            f"*Name:* {name}\n"
            f"*Email:* {email}\n"
            f"*Experience:* {years_of_experience} years\n"
            f"*Skills:* {skills}\n"
            f"*Performance Score:* {performance_score if performance_score is not None else 'N/A'}\n"
        )

        self.send_message(message)