import os
import uuid
from langchain_openai import ChatOpenAI
import pandas as pd
from pandasai import SmartDataframe
from csv_service import clean_data
from dotenv import load_dotenv
from util_service import handle_out_of_range_float, process_answer

load_dotenv()
openai_api_keys = os.getenv("OPENAI_API_KEYS").split(",")
openai_api_base = os.getenv("OPENAI_API_BASE")

# Create an array of ChatOpenAI instances
llm_instances = [
    ChatOpenAI(model='gpt-4o', api_key=key, base_url=openai_api_base)
    for key in openai_api_keys
]
current_llm_index = 0

instructions = """
- Please ensure that each value is clearly visible, You may need to adjust the font size, rotate the labels, or use truncation to improve readability (if needed).
- For multiple charts, arrange them in a grid format (2x2, 3x3, etc.)
- Use professional and color-blind friendly palettes.
- Do not use sns.set_palette()
- Read above instructions and follow them.
"""

def should_rotate_key(response):
    """Check if response indicates API key needs rotation"""
    if isinstance(response, str):
        return any(msg in response for msg in [
            "plan.rule:api_request",
            "resource limit",
            "exhausted the available",
            "update your payment method"
        ])
    return False

def handle_api_error(error, current_index):
    """Determine if we should rotate API keys based on error message"""
    error_msg = str(error)
    if any(msg in error_msg for msg in [
        "plan.rule:api_request",
        "429",
        "resource limit",
        "exhausted the available",
        "update your payment method"
    ]):
        print(f"Rotating API key due to resource limit (key index {current_index})")
        return True
    return False

def openai_chat(csv_url: str, question: str):
    global current_llm_index

    while current_llm_index < len(llm_instances):
        try:
            data = clean_data(csv_url)
            llm = llm_instances[current_llm_index]
            
            chart_filename = f"chart_{uuid.uuid4()}.png"
            chart_path = os.path.join("generated_charts", chart_filename)
            
            df = SmartDataframe(
                data,
                config={
                    'llm': llm,
                    'save_charts': True,
                    'open_charts': False,
                    'save_charts_path': os.path.dirname(chart_path),
                    'custom_chart_filename': chart_filename
                }
            )
            
            answer = df.chat(question)
            
            # Check if answer contains API limit error or process_answer is true
            if should_rotate_key(answer) or process_answer(answer):
                current_llm_index += 1
                continue
                
            return answer

        except Exception as e:
            if handle_api_error(e, current_llm_index):
                current_llm_index += 1
                continue
            return {"error": f"Non-recoverable error: {str(e)}"}
    
    return {"error": "All API keys exhausted. Please update billing information."}





def openai_chart(csv_url: str, question: str):
    global current_llm_index

    while current_llm_index < len(llm_instances):
        try:
            data = clean_data(csv_url)
            llm = llm_instances[current_llm_index]
            
            chart_filename = f"chart_{uuid.uuid4()}.png"
            chart_path = os.path.join("generated_charts", chart_filename)
            
            df = SmartDataframe(
                data,
                config={
                    'llm': llm,
                    'save_charts': True,
                    'open_charts': False,
                    'save_charts_path': os.path.dirname(chart_path),
                    'custom_chart_filename': chart_filename
                }
            )
            
            answer = df.chat(question + instructions)
            
            # Check if answer contains API limit error or process_answer is true
            if should_rotate_key(answer) or process_answer(answer):
                current_llm_index += 1
                continue
                
            return answer

        except Exception as e:
            if handle_api_error(e, current_llm_index):
                current_llm_index += 1
                continue
            return {"error": f"Chart generation failed: {str(e)}"}
    
    return {"error": "All API keys exhausted. Please update billing information."}