from fastapi import FastAPI
from pydantic import BaseModel
from transformers import pipeline, AutoTokenizer
import os
import uvicorn

app = FastAPI()

# Read Hugging Face token from environment
HF_AUTH_TOKEN = os.getenv("HF_TOKEN")

# Load model and tokenizer using auth token
MODEL_NAME = "VincentMuriuki/legal-summarizer"
summarizer = pipeline("summarization", model=MODEL_NAME, use_auth_token=HF_AUTH_TOKEN)
tokenizer = AutoTokenizer.from_pretrained(MODEL_NAME, use_auth_token=HF_AUTH_TOKEN)

class SummarizeInput(BaseModel):
    text: str

class ChunkInput(BaseModel):
    text: str
    max_tokens: int = 512

@app.post("/summarize")
def summarize_text(data: SummarizeInput):
    summary = summarizer(data.text, max_length=150, min_length=30, do_sample=False)
    return {"summary": summary[0]["summary_text"]}

@app.post("/chunk")
def chunk_text(data: ChunkInput):
    tokens = tokenizer.encode(data.text, truncation=False)
    chunks = []

    for i in range(0, len(tokens), data.max_tokens):
        chunk_tokens = tokens[i:i + data.max_tokens]
        chunk_text = tokenizer.decode(chunk_tokens, skip_special_tokens=True)
        chunks.append(chunk_text.strip())

    return {"chunks": chunks}

if _name_ == "_main_":
    uvicorn.run(app, host="0.0.0.0", port=7860)