import gradio as gr
import os, torch
from datasets import load_dataset
from huggingface_hub import HfApi, login
from transformers import AutoModelForCausalLM, AutoTokenizer, Seq2SeqTrainer, Seq2SeqTrainingArguments, pipeline

ACTION_1 = "Prompt base model"
ACTION_2 = "Fine-tune base model"
ACTION_3 = "Prompt fine-tuned model"

SYSTEM_PROMPT = "You are a text to SQL query translator. Given a question in English, generate a SQL query based on the provided SCHEMA. Do not generate any additional text. SCHEMA: {schema}"
USER_PROMPT = "What is the total trade value and average price for each trader and stock in the trade_history table?"
SQL_SCHEMA = "CREATE TABLE trade_history (id INT, trader_id INT, stock VARCHAR(255), price DECIMAL(5,2), quantity INT, trade_time TIMESTAMP);"

BASE_MODEL_NAME = "meta-llama/Meta-Llama-3.1-8B-Instruct"
FT_MODEL_NAME = "bstraehle/Meta-Llama-3.1-8B-Instruct-text-to-sql"
DATASET_NAME = "gretelai/synthetic_text_to_sql"

def process(action, base_model_name, ft_model_name, dataset_name, system_prompt, user_prompt, sql_schema):
    #raise gr.Error("Please clone and bring your own credentials.")
    if action == ACTION_1:
        result = prompt_model(base_model_name, system_prompt, user_prompt, sql_schema)
    elif action == ACTION_2:
        result = fine_tune_model(base_model_name, dataset_name)
    elif action == ACTION_3:
        result = prompt_model(ft_model_name, system_prompt, user_prompt, sql_schema)
    return result

def fine_tune_model(model_name, dataset_name):
    # Load dataset
    dataset = load_dataset(dataset_name)

    print("### Dataset")
    print(dataset)
    print("###")
    
    # Load model
    model, tokenizer = load_model(model_name)

    print("### Model")
    print(model)
    print("### Tokenizer")
    print(tokenizer)
    print("###")
    
    # Pre-process dataset
    def preprocess(examples):
        model_inputs = tokenizer(examples["sql_prompt"], text_target=examples["sql"], max_length=512, padding="max_length", truncation=True)
        return model_inputs
    dataset = dataset.map(preprocess, batched=True)

    print("### Pre-processed dataset")
    print(dataset)
    print("###")
    
    # Split dataset into training and validation sets
    train_dataset = dataset["train"].shuffle(seed=42).select(range(1000))
    test_dataset = dataset["test"].shuffle(seed=42).select(range(100))

    print("### Training dataset")
    print(test_dataset)
    print("### Validation dataset")
    print(test_dataset)
    print("###")
    
    # Configure training arguments
    training_args = Seq2SeqTrainingArguments(
        output_dir="./results",
        logging_dir="./logs",
        num_train_epochs=1,
        per_device_train_batch_size=16,
        per_device_eval_batch_size=64,
        eval_strategy="steps",
        save_total_limit=2,
        save_steps=500,
        eval_steps=500,
        warmup_steps=500,
        weight_decay=0.01,
        metric_for_best_model="accuracy",
        greater_is_better=True,
        load_best_model_at_end=True,
        push_to_hub=True,
        save_on_each_node=True,
    )

    print("### Training arguments")
    print(training_args)
    print("###")
    
    # Create trainer
    trainer = Seq2SeqTrainer(
        model=model,
        args=training_args,
        train_dataset=train_dataset,
        eval_dataset=test_dataset,
        compute_metrics=lambda pred: {"accuracy": torch.sum(pred.label_ids == pred.predictions.argmax(-1))},
    )

    print("### Trainer")
    print(trainer)
    print("###")
    
    # Train model
    #trainer.train()

def prompt_model(model_name, system_prompt, user_prompt, sql_schema):
    pipe = pipeline("text-generation", 
                    model=model_name,
                    device_map="auto",
                    max_new_tokens=1000)
    
    messages = [
      {"role": "system", "content": system_prompt.format(schema=sql_schema)},
      {"role": "user", "content": user_prompt},
      {"role": "assistant", "content": ""}
    ]
    
    output = pipe(messages)
    
    result = output[0]["generated_text"][-1]["content"]

    print("###")
    print(result)
    print("###")
    
    return result

def load_model(model_name):
    model = AutoModelForCausalLM.from_pretrained(model_name, device_map="auto")
    #tokenizer = AutoTokenizer.from_pretrained(model_name)
    tokenizer = model.tokenizer

    if not tokenizer.pad_token:
        tokenizer.pad_token = tokenizer.eos_token
   
    return model, tokenizer
    
demo = gr.Interface(fn=process, 
                    inputs=[gr.Radio([ACTION_1, ACTION_2, ACTION_3], label = "Action", value = ACTION_3),
                            gr.Textbox(label = "Base Model Name", value = BASE_MODEL_NAME, lines = 1),
                            gr.Textbox(label = "Fine-Tuned Model Name", value = FT_MODEL_NAME, lines = 1),
                            gr.Textbox(label = "Dataset Name", value = DATASET_NAME, lines = 1),
                            gr.Textbox(label = "System Prompt", value = SYSTEM_PROMPT, lines = 2),
                            gr.Textbox(label = "User Prompt", value = USER_PROMPT, lines = 2),
                            gr.Textbox(label = "SQL Schema", value = SQL_SCHEMA, lines = 2)],
                    outputs=[gr.Textbox(label = "Prompt Completion", value = os.environ["OUTPUT"])])
demo.launch()