from flask import Flask, request, jsonify
from langchain_community.llms import LlamaCpp
from sentence_transformers import SentenceTransformer
from transformers import AutoTokenizer, AutoModel

# cosine_similarity
import torch
from torch.nn.functional import cosine_similarity
import os 
app = Flask(__name__)

n_gpu_layers = 0
n_batch = 1024


llm = LlamaCpp(
    model_path="Phi-3-mini-4k-instruct-q4.gguf",  # path to GGUF file
    temperature=0.1,
    n_gpu_layers=n_gpu_layers,
    n_batch=n_batch,
    verbose=True,
    n_ctx=4096
)
model0 = AutoModel.from_pretrained('sentence-transformers/paraphrase-TinyBERT-L6-v2')

model = SentenceTransformer('sentence-transformers/paraphrase-TinyBERT-L6-v2')

file_size = os.stat('Phi-3-mini-4k-instruct-q4.gguf')
print("model size ====> :", file_size.st_size, "bytes")


@app.route('/cv', methods=['POST'])
def get_skills():
    cv_body = request.json.get('cv_body')

    # Simple inference example
    output = llm(
        f"<|user|>\n{cv_body}<|end|>\n<|assistant|>Can you list the skills mentioned in the CV?<|end|>",
        max_tokens=256,  # Generate up to 256 tokens
        stop=["<|end|>"], 
        echo=True,  # Whether to echo the prompt
    )

    return jsonify({'skills': output})

@app.get('/')
def health():
    return jsonify({'status': 'Worked'})
# we will make here post request to compare between lists of skills one has employee just one text and the other has the of jobs has many texts
# the llm will say the most similar job to the cv
@app.route('/compare', methods=['POST'])
def compare():
    employee_skills = request.json.get('employee_skills')  # CV text
    jobs_skills = request.json.get('jobs_skills')  # List of job skills
    
    if not isinstance(jobs_skills, list) or not all(isinstance(skill, str) for skill in jobs_skills):
        raise ValueError("The jobs_skills must be a list of strings")
    
    # Convert texts to embeddings arrays
    employee_embedding = np.array([model.encode(employee_skills)])
    job_embeddings = np.array([model.encode(skill) for skill in jobs_skills])

    # Calculate similarity using cosine similarity
    similarities = cosine_similarity(employee_embedding, job_embeddings)[0]

    # Find the most similar job and its corresponding similarity score
    max_similarity = np.max(similarities)
    most_similar_index = np.argmax(similarities)
    most_similar_job = jobs_skills[most_similar_index]

    return jsonify({'job': most_similar_job, 'similarity_score': max_similarity})

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