import requests
import os

HF_API_KEY = os.getenv("HF_API_KEY")
HF_MODEL = "google/flan-t5-small"
HF_API_URL = f"https://api-inference.huggingface.co/models/{HF_MODEL}"

HEADERS = {
    "Authorization": f"Bearer {HF_API_KEY}",
    "Content-Type": "application/json"
}


def call_llm(prompt: str) -> str:
    response = requests.post(
        HF_API_URL,
        headers=HEADERS,
        json={"inputs": prompt}
    )
    if response.status_code != 200:
        raise Exception(f"Hugging Face API Error {response.status_code}: {response.text}")

    try:
        return response.json()[0]["generated_text"]
    except Exception as e:
        raise Exception(f"Error parsing Hugging Face response: {response.text}")


def get_certification_suggestions(text: str) -> str:
    prompt = f"Suggest 5 certifications for this resume: {text}"
    return call_llm(prompt)


def get_higher_education_suggestions(text: str) -> str:
    prompt = f"Suggest higher education programs for this resume: {text}"
    return call_llm(prompt)


def get_visa_recommendations(text: str) -> str:
    prompt = f"Suggest visa opportunities in top countries based on this resume: {text}"
    return call_llm(prompt)


def get_career_advice(text: str) -> str:
    prompt = f"Give career counseling advice based on this resume: {text}"
    return call_llm(prompt)


def get_job_listings(text: str):
    ADZUNA_API_KEY = os.getenv("ADZUNA_API_KEY")
    ADZUNA_APP_ID = os.getenv("ADZUNA_APP_ID")

    if not ADZUNA_API_KEY or not ADZUNA_APP_ID:
        return ["Adzuna API credentials missing."]

    params = {
        "app_id": ADZUNA_APP_ID,
        "app_key": ADZUNA_API_KEY,
        "what": "engineer",
        "results_per_page": 5
    }

    url = "https://api.adzuna.com/v1/api/jobs/us/search/1"
    response = requests.get(url, params=params)

    if response.status_code == 200:
        try:
            jobs = response.json()["results"]
            return [f"{j['title']} - {j['location']['display_name']}" for j in jobs]
        except:
            return ["Error parsing Adzuna job data."]
    return [f"Job API Error {response.status_code}: {response.text}"]