app.py

import os
import re
import gradio as gr
from groq import Groq

# -----------------------------
# Groq Initialization
# -----------------------------
client = Groq(api_key=os.environ.get("GROQ_API_KEY"))
MODEL_NAME = "llama-3.1-8b-instant"

# -----------------------------
# System Prompt
# -----------------------------
SYSTEM_PROMPT = """
You are an elite Senior Industry Interviewer and AI Interview Coach from a top global technology company.

Conduct a structured mock interview.

INTERVIEW STRUCTURE:
PHASE 1 – Introduction: Greet, confirm role, warm-up.
PHASE 2 – Technical: One question at a time, adjust difficulty.
PHASE 3 – Behavioral: Teamwork, leadership, problem-solving, failure.
PHASE 4 – Rapid Fire: 5 short questions.

RULES:
- Professional
- Do not break role
- No feedback until candidate types EXACTLY: END INTERVIEW

Generate report in this format:

INTERVIEW SUMMARY REPORT

Candidate Role: <role>
Technical Knowledge Score: X/10
Problem Solving Score: X/10
Communication Score: X/10
Confidence Score: X/10
Overall Hire Recommendation: Strong Hire / Hire / Borderline / Reject

Strengths:
• Bullet points

Areas for Improvement:
• Bullet points

Suggested Preparation Strategy:
• Bullet points

Never explain scoring logic.
Never say you are AI.
"""

# -----------------------------
# Function to stream chat from Groq
# -----------------------------
def chat_with_llama_stream(user_message, backend_messages):
    # Build fresh list of dicts for Groq API
    messages_for_groq = [{"role": "system", "content": SYSTEM_PROMPT}]
    for msg in backend_messages:
        messages_for_groq.append({"role": msg["role"], "content": msg["content"]})
    messages_for_groq.append({"role": "user", "content": user_message})

    # Stream response
    response = client.chat.completions.create(
        model=MODEL_NAME,
        messages=messages_for_groq,
        stream=True,
    )

    full_response = ""
    for chunk in response:
        if chunk.choices[0].delta.content:
            full_response += chunk.choices[0].delta.content
            yield full_response

# -----------------------------
# Confidence extractor
# -----------------------------
def extract_confidence_score(text):
    match = re.search(r"Confidence Score:\s*(\d+)/10", text)
    if match:
        return int(match.group(1))
    return None

# -----------------------------
# Gradio UI
# -----------------------------
with gr.Blocks(theme=gr.themes.Soft()) as demo:

    gr.Markdown("## 🎯 AI Mock Interview System")
    gr.Markdown("Powered by Groq + LLaMA 3.1")

    chatbot = gr.Chatbot([], elem_id="chatbot")
    msg = gr.Textbox(placeholder="Enter your role or answer...", label="Your Input")
    confidence_display = gr.Number(label="Confidence Score", interactive=False)
    backend_messages = gr.State([])  # always store as list of dicts

    def respond(user_message, backend_messages, chat_display):
        backend_messages = backend_messages or []
        chat_display = chat_display or []

        # Add user to UI display
        chat_display.append((user_message, ""))

        assistant_text = ""
        for partial in chat_with_llama_stream(user_message, backend_messages):
            assistant_text = partial
            # Update last assistant message in UI
            chat_display[-1] = (user_message, assistant_text)
            yield chat_display, backend_messages, None

        # Add user & assistant to backend messages (dicts only)
        backend_messages.append({"role": "user", "content": user_message})
        backend_messages.append({"role": "assistant", "content": assistant_text})

        # Extract confidence score
        score = extract_confidence_score(assistant_text)
        yield chat_display, backend_messages, score

    msg.submit(respond, [msg, backend_messages, chatbot], [chatbot, backend_messages, confidence_display])

demo.launch()