import gradio as gr
from transformers import AutoTokenizer, AutoModelForCausalLM
from example_strings import example1, example2, example3


# tokenizer6B = AutoTokenizer.from_pretrained(f"NumbersStation/nsql-6B")
# model6B = AutoModelForCausalLM.from_pretrained(f"NumbersStation/nsql-6B")

# tokenizer2B = AutoTokenizer.from_pretrained(f"NumbersStation/nsql-2B")
# model2B = AutoModelForCausalLM.from_pretrained(f"NumbersStation/nsql-2B")

# tokenizer350M = AutoTokenizer.from_pretrained(f"NumbersStation/nsql-2B")
# model350M = AutoModelForCausalLM.from_pretrained(f"NumbersStation/nsql-2B")


def load_model(model_name: str):
    tokenizer = AutoTokenizer.from_pretrained(f"NumbersStation/{model_name}")
    model = AutoModelForCausalLM.from_pretrained(f"NumbersStation/{model_name}")
    return tokenizer, model


def infer(input_text, model_choice):
    tokenizer, model = load_model(model_choice)
    input_ids = tokenizer(input_text, return_tensors="pt").input_ids
    generated_ids = model.generate(input_ids, max_length=500)
    return (tokenizer.decode(generated_ids[0], skip_special_tokens=True))


iface = gr.Interface(
    title="Text to SQL with NSQL",
    description="""The NSQL model family was published by [Numbers Station](https://www.numbersstation.ai/) and is available in three flavors:
    - [nsql-6B](https://huggingface.co/NumbersStation/nsql-6B)
    - [nsql-2B](https://huggingface.co/NumbersStation/nsql-2B)
    - [nsql-350M]((https://huggingface.co/NumbersStation/nsql-350M))
    This demo let's you choose which one you want to use and provides the three examples you can also find in their model cards.

    In general you should first provide the table schemas of the tables you have questions about and then prompt it with a natural language question.
    The model will then generate a SQL query that you can run against your database.
    """,
    fn=infer, 
    inputs=["text", 
            gr.Dropdown(["nsql-6B", "nsql-2B", "nsql-350M"], value="nsql-6B")], 
    outputs="text",
    examples=[[example1, "nsql-6B"],
              [example2, "nsql-2B"],
              [example3, "nsql-350M"]])
iface.launch()