"""Model selection utilities for nanocode."""

import os
from .display import RESET, BOLD, DIM, BLUE, GREEN, RED

# Available OpenRouter models
AVAILABLE_MODELS = {
    "1": ("Claude 3.5 Sonnet", "anthropic/claude-3.5-sonnet"),
    "2": ("Claude 3.5 Haiku", "anthropic/claude-3.5-haiku"),
    "3": ("GPT-4o", "openai/gpt-4o"),
    "4": ("GPT-4o mini", "openai/gpt-4o-mini"),
    "5": ("Gemini Pro 1.5", "google/gemini-pro-1.5"),
    "6": ("Llama 3.1 405B", "meta-llama/llama-3.1-405b-instruct"),
    "7": ("DeepSeek V3", "deepseek/deepseek-chat"),
    "8": ("Qwen 2.5 72B", "qwen/qwen-2.5-72b-instruct"),
}


def select_model():
    """Interactive model selection or use environment variable."""
    # Check environment variable first
    model_env = os.getenv("MODEL")
    if model_env:
        print(f"{GREEN}⏺ Using model from environment: {model_env}{RESET}")
        return model_env
    
    print(f"\n{BOLD}Select a model:{RESET}")
    for key, (name, model_id) in AVAILABLE_MODELS.items():
        print(f"  {BLUE}{key}{RESET}. {name} ({DIM}{model_id}{RESET})")
    print(f"  {BLUE}c{RESET}. Custom model (enter manually)")
    
    while True:
        try:
            choice = input(f"\n{BOLD}{BLUE}❯{RESET} Enter choice (1-8 or c): ").strip().lower()
            
            if choice in AVAILABLE_MODELS:
                name, model_id = AVAILABLE_MODELS[choice]
                print(f"{GREEN}⏺ Selected: {name}{RESET}")
                return model_id
            elif choice == "c":
                custom_model = input(f"{BOLD}{BLUE}❯{RESET} Enter model ID (e.g., openai/gpt-4): ").strip()
                if custom_model:
                    print(f"{GREEN}⏺ Selected custom model: {custom_model}{RESET}")
                    return custom_model
                else:
                    print(f"{RED}⏺ Invalid model ID{RESET}")
            else:
                print(f"{RED}⏺ Invalid choice. Please enter 1-8 or c{RESET}")
        except (KeyboardInterrupt, EOFError):
            print(f"\n{RED}⏺ Model selection cancelled{RESET}")
            exit(1)