import spaces
import json
import torch
import gradio as gr
from transformers import AutoModelForCausalLM, AutoTokenizer

# Load model and tokenizer
model_name = "Salesforce/xLAM-1b-fc-r"

title = f"Eval Model: {model_name}"
description = """"""

model = AutoModelForCausalLM.from_pretrained(model_name, device_map="auto", torch_dtype="auto", trust_remote_code=True)
tokenizer = AutoTokenizer.from_pretrained(model_name)

# Set random seed for reproducibility
torch.random.manual_seed(0)

# Task and format instructions
task_instruction = """
Based on the previous context and API request history, generate an API request or a response as an AI assistant.""".strip()

format_instruction = """
The output should be of the JSON format, which specifies a list of generated function calls. The example format is as follows, please make sure the parameter type is correct. If no function call is needed, please make 
tool_calls an empty list "[]".
```
{"thought": "the thought process, or an empty string", "tool_calls": [{"name": "api_name1", "arguments": {"argument1": "value1", "argument2": "value2"}}]}
```
""".strip()

# Example tools and query
example_tools = json.dumps([
    {
        "name": "get_weather",
        "description": "Get the current weather for a location",
        "parameters": {
            "type": "object",
            "properties": {
                "location": {
                    "type": "string",
                    "description": "The city and state, e.g. San Francisco, New York"
                },
                "unit": {
                    "type": "string",
                    "enum": ["celsius", "fahrenheit"],
                    "description": "The unit of temperature to return"
                }
            },
            "required": ["location"]
        }
    },
    {
        "name": "search",
        "description": "Search for information on the internet",
        "parameters": {
            "type": "object",
            "properties": {
                "query": {
                    "type": "string",
                    "description": "The search query, e.g. 'latest news on AI'"
                }
            },
            "required": ["query"]
        }
    }
], indent=2)

example_query = "What's the weather like in New York in fahrenheit?"

def convert_to_xlam_tool(tools):
    if isinstance(tools, dict):
        return {
            "name": tools["name"],
            "description": tools["description"],
            "parameters": {k: v for k, v in tools["parameters"].get("properties", {}).items()}
        }
    elif isinstance(tools, list):
        return [convert_to_xlam_tool(tool) for tool in tools]
    else:
        return tools

def build_prompt(task_instruction: str, format_instruction: str, tools: list, query: str):
    prompt = f"[BEGIN OF TASK INSTRUCTION]\n{task_instruction}\n[END OF TASK INSTRUCTION]\n\n"
    prompt += f"[BEGIN OF AVAILABLE TOOLS]\n{json.dumps(tools)}\n[END OF AVAILABLE TOOLS]\n\n"
    prompt += f"[BEGIN OF FORMAT INSTRUCTION]\n{format_instruction}\n[END OF FORMAT INSTRUCTION]\n\n"
    prompt += f"[BEGIN OF QUERY]\n{query}\n[END OF QUERY]\n\n"
    return prompt

@spaces.GPU
def generate_response(tools_input, query):
    try:
        tools = json.loads(tools_input)
    except json.JSONDecodeError:
        return "Error: Invalid JSON format for tools input."

    xlam_format_tools = convert_to_xlam_tool(tools)
    content = build_prompt(task_instruction, format_instruction, xlam_format_tools, query)

    messages = [
        {'role': 'user', 'content': content}
    ]

    inputs = tokenizer.apply_chat_template(messages, add_generation_prompt=True, return_tensors="pt").to(model.device)
    outputs = model.generate(inputs, max_new_tokens=512, do_sample=False, num_return_sequences=1, eos_token_id=tokenizer.eos_token_id)
    agent_action = tokenizer.decode(outputs[0][len(inputs[0]):], skip_special_tokens=True)

    return agent_action

# Gradio interface
with gr.Blocks() as demo:
    gr.Markdown(title)
    gr.Markdown(description)
    
    with gr.Row():
        with gr.Column():
            tools_input = gr.Code(
                label="Available Tools (JSON format)",
                lines=20,
                value=example_tools,
                language='json'
            )
            query_input = gr.Textbox(
                label="User Query",
                lines=2,
                value=example_query
            )
            submit_button = gr.Button("Generate Response")
        
        with gr.Column():
            output = gr.Code(label="🎬 xLam :", lines=10, language="json")
    
    submit_button.click(generate_response, inputs=[tools_input, query_input], outputs=output)

if __name__ == "__main__":
    demo.launch()