import os
HF_TOKEN = os.environ["HF_TOKEN"]
# os.environ["BITSANDBYTES_NOWELCOME"] = "1"
import re
import spaces
import gradio as gr
import torch
from transformers import AutoTokenizer, AutoModelForCausalLM, BitsAndBytesConfig
from huggingface_hub import login, HfFolder
tokenizer = AutoTokenizer.from_pretrained("FlawedLLM/Bhashini_gemma_merged16bit_clean_final", trust_remote_code=True)
quantization_config = BitsAndBytesConfig(
        load_in_4bit=True,
        bnb_4bit_use_double_quant=True,
        bnb_4bit_quant_type="nf4",  
        bnb_4bit_compute_dtype=torch.float16)
model = AutoModelForCausalLM.from_pretrained("FlawedLLM/Bhashini_gemma_merged16bit_clean_final", 
                                             device_map="auto",
                                             quantization_config=quantization_config, 
                                             torch_dtype =torch.float16, 
                                             low_cpu_mem_usage=True, 
                                             trust_remote_code=True)

# alpaca_prompt = You MUST copy from above!
@spaces.GPU(duration=300)
def chunk_it(input_command, item_list):
    alpaca_prompt = """Below is an instruction that describes a task, paired with an input that provides further context. Write a response that appropriately completes the request.
    
    ### Instruction:
    {}
    
    ### Input:
    {}
    
    ### Response:
    {}"""
    if item_list is not None:
        item_list = f'''The ItemName should be chosen from the given list : {item_list} , except when adding item. If ItemName does not find anything SIMILAR in the list, then the ItemName should be "Null" '''
    inputs = tokenizer(
    [
        alpaca_prompt.format(
            f'''
            You will receive  text input that you need to analyze to perform the following tasks:
            
            transaction: Record the details of an item transaction.
            last n days transactions: Retrieve transaction records for a specified time period.
            view risk inventory: View inventory items based on a risk category.
            view inventory: View inventory details.
            new items: Add new items to the inventory.
            old items: View old items in inventory.
            report generation: Generate various inventory reports.
            Required Parameters:
            
            Each task requires specific parameters to execute correctly:
            
            transaction:
                ItemName (string)
                ItemQt (quantity - integer)
                Type (string: "sale" or "purchase" or "return")
                ShelfNo (string or integer)
                ReorderPoint (integer)
            last n days transactions:
                ItemName (string)
                Duration (integer: number of days)
            view risk inventory:
                RiskType (string: "overstock", "understock", or Null for all risk types)
            view inventory:
                ItemName (string)
                ShelfNo (string or integer)
            new items:
                ItemName (string)
                SellingPrice (number)
                CostPrice (number)
            old items:
                ShelfNo (string or integer)
            report generation:
                ItemName (string)
                Duration (integer: number of days)
                ReportType (string: "profit", "revenue", "inventory", or Null for all reports)
            
             {item_list}
            

            ALWAYS provide output in a JSON format.''', # instruction
            input_command, # input
            "", # output - leave this blank for generation!
        )
    ], return_tensors = "pt").to("cuda")
    
    outputs = model.generate(**inputs, max_new_tokens = 216, use_cache = True)
    tokenizer.batch_decode(outputs)
    
    reply=tokenizer.batch_decode(outputs)
    # Regular expression pattern to match content between "### Response:" and "<|end_of_text|>"
    pattern = r"### Response:\n(.*?)<\|end_of_text\|>"
    # Search for the pattern in the text
    match = re.search(pattern, reply[0], re.DOTALL)  # re.DOTALL allows '.' to match newlines
    reply = match.group(1).strip()  # Extract and remove extra whitespace

    return reply



iface = gr.Interface(
    fn=chunk_it,
    inputs=[
        gr.Textbox(label="Input Command", lines=3),
        gr.Textbox(label="Item List", lines=5)
    ],
    outputs="text",
    title="Formatter Pro",
)

iface.launch(inline=False)