app.py

import json, time, csv, os
import gradio as gr
from transformers import pipeline

# ————————————————
# Load taxonomies
# ————————————————
with open("coarse_labels.json") as f:
    coarse_labels = json.load(f)
with open("fine_labels.json") as f:
    fine_map = json.load(f)

# ————————————————
# Model choices (5 only)
# ————————————————
MODEL_CHOICES = [
    "facebook/bart-large-mnli",
    "roberta-large-mnli",
    "joeddav/xlm-roberta-large-xnli",
    "valhalla/distilbart-mnli-12-4",
    "educationfoundation/Phantom-7B-JEE"  # placeholder — replace with real phantom model
]

# ————————————————
# Ensure log files exist
# ————————————————
LOG_FILE      = "logs.csv"
FEEDBACK_FILE = "feedback.csv"
for fn, hdr in [
    (LOG_FILE,      ["timestamp","model","question","chosen_subject","top3_topics","duration"]),
    (FEEDBACK_FILE, ["timestamp","question","subject_feedback","topic_feedback"])
]:
    if not os.path.exists(fn):
        with open(fn, "w", newline="") as f:
            csv.writer(f).writerow(hdr)

# ————————————————
# Inference functions
# ————————————————
def run_stage1(question, model_name):
    """Return top3 coarse subjects + duration."""
    start = time.time()
    clf = pipeline("zero-shot-classification", model=model_name)
    out = clf(question, candidate_labels=coarse_labels)
    labels, scores = out["labels"][:3], out["scores"][:3]
    duration = round(time.time()-start,3)
    return labels, duration

def run_stage2(question, model_name, subject):
    """Return top3 fine topics + duration."""
    start = time.time()
    clf = pipeline("zero-shot-classification", model=model_name)
    fine_labels = fine_map.get(subject, [])
    out = clf(question, candidate_labels=fine_labels)
    labels, scores = out["labels"][:3], out["scores"][:3]
    duration = round(time.time()-start,3)
    # Log combined run
    with open(LOG_FILE, "a", newline="") as f:
        csv.writer(f).writerow([
            time.strftime("%Y-%m-%d %H:%M:%S"),
            model_name,
            question.replace("\n"," "),
            subject,
            ";".join(labels),
            duration
        ])
    return {lbl: round(score,3) for lbl,score in zip(labels, scores)}, f"⏱ {duration}s"

def submit_feedback(question, subject_fb, topic_fb):
    with open(FEEDBACK_FILE, "a", newline="") as f:
        csv.writer(f).writerow([
            time.strftime("%Y-%m-%d %H:%M:%S"),
            question.replace("\n"," "),
            subject_fb,
            topic_fb
        ])
    return "✅ Feedback recorded!"

# ————————————————
# Build Gradio UI
# ————————————————
with gr.Blocks() as demo:
    gr.Markdown("## Hierarchical Zero-Shot Tagger with Subject Toggle & Feedback")

    with gr.Row():
        question_input = gr.Textbox(lines=3, label="Enter your question")
        model_input    = gr.Dropdown(
            choices=MODEL_CHOICES, value=MODEL_CHOICES[0], label="Choose model"
        )
        go_button      = gr.Button("Run Stage 1")

    # Stage 1 outputs
    subj_radio     = gr.Radio(choices=[], label="Top-3 Subjects",
                              info="Select to re-run Stage 2 for a different subject")
    stage1_time    = gr.Textbox(label="Stage 1 Time")

    go_button.click(
        fn=lambda q,m: (*run_stage1(q,m),), 
        inputs=[question_input, model_input],
        outputs=[subj_radio, stage1_time]
    )

    # Stage 2 UI
    go2_button  = gr.Button("Run Stage 2")
    topics_out  = gr.Label(label="Top-3 Topics")
    stage2_time = gr.Textbox(label="Stage 2 Time")

    go2_button.click(
        fn=run_stage2,
        inputs=[question_input, model_input, subj_radio],
        outputs=[topics_out, stage2_time]
    )

    gr.Markdown("---")
    gr.Markdown("### Feedback / Correction")

    subject_fb = gr.Textbox(label="Correct Subject")
    topic_fb   = gr.Textbox(label="Correct Topic(s)")
    fb_button  = gr.Button("Submit Feedback")
    fb_status  = gr.Textbox(label="")

    fb_button.click(
        fn=submit_feedback,
        inputs=[question_input, subject_fb, topic_fb],
        outputs=[fb_status]
    )

demo.launch(share=True, ssr=False)