import json
import os
import dspy
from typing import List, Dict, Any
from .constants import (
    CATEGORIES_FILE,
    SETTINGS_FILE,
    HISTORY_FILE,
    DEFAULT_CATEGORIES,
    DEFAULT_MODEL,
    DEFAULT_ITERATIONS,
    DEFAULT_PATIENCE,
    DEFAULT_USE_CACHE,
    MAX_HISTORY_ITEMS,
    OPENROUTER_API_BASE,
    OPENROUTER_MAX_TOKENS,
    OPENROUTER_TEMPERATURE,
    ERROR_NO_API_KEY,
    ERROR_SAVE_CATEGORIES,
    ERROR_LOAD_CATEGORIES,
    ERROR_SAVE_SETTINGS,
    ERROR_LOAD_SETTINGS,
    ERROR_SAVE_HISTORY,
    ERROR_LOAD_HISTORY,
    ERROR_DSPy_INIT,
    TWEET_MAX_LENGTH,
)


def save_categories(categories: List[str]) -> None:
    """Save categories to JSON file."""
    try:
        with open(CATEGORIES_FILE, "w") as f:
            json.dump(categories, f, indent=2)
    except Exception as e:
        print(f"{ERROR_SAVE_CATEGORIES}: {str(e)}")


def load_categories() -> List[str]:
    """Load categories from JSON file."""
    try:
        if os.path.exists(CATEGORIES_FILE):
            with open(CATEGORIES_FILE, "r") as f:
                categories = json.load(f)
                return categories if isinstance(categories, list) else []
        else:
            save_categories(DEFAULT_CATEGORIES)
            return DEFAULT_CATEGORIES
    except Exception as e:
        print(f"{ERROR_LOAD_CATEGORIES}: {str(e)}")
        return []


def get_dspy_lm(model_name: str):
    """Get a DSPy LM instance for the specified model (cached per model)."""
    try:
        openrouter_key = os.getenv("OPENROUTER_API_KEY")
        if not openrouter_key:
            raise ValueError(ERROR_NO_API_KEY)

        max_tokens = 16000 if "openai/gpt-5" in model_name else OPENROUTER_MAX_TOKENS
        temperature = 1.0 if "openai/gpt-5" in model_name else OPENROUTER_TEMPERATURE

        lm = dspy.LM(
            model=model_name,
            api_key=openrouter_key,
            api_base=OPENROUTER_API_BASE,
            max_tokens=max_tokens,
            temperature=temperature,
        )
        return lm
    except Exception as e:
        raise Exception(f"Failed to create LM: {str(e)}")


def initialize_dspy(
    model_name: str = DEFAULT_MODEL, use_cache: bool = DEFAULT_USE_CACHE
) -> bool:
    """Initialize DSPy with OpenRouter and selected model."""
    # Configure cache settings
    try:
        dspy.configure_cache(enable_memory_cache=use_cache, enable_disk_cache=use_cache)
    except Exception:
        # Cache configuration might fail in some environments, continue anyway
        pass

    # Only configure DSPy once globally
    if not hasattr(dspy, "_replit_configured"):
        try:
            # Get the LM for the default model
            default_lm = get_dspy_lm(model_name)
            dspy.configure(lm=default_lm)
            dspy._replit_configured = True  # type: ignore
        except Exception as e:
            raise Exception(f"{ERROR_DSPy_INIT}: {str(e)}")

    return True


def format_tweet_for_display(tweet: str) -> str:
    """Format tweet text for better display."""
    return tweet.strip()


def calculate_tweet_length(tweet: str) -> int:
    """Calculate tweet length."""
    return len(tweet.strip())


def is_valid_tweet(tweet: str) -> bool:
    """Check if tweet is valid (not empty and within character limit)."""
    cleaned_tweet = tweet.strip()
    return bool(cleaned_tweet) and len(cleaned_tweet) <= TWEET_MAX_LENGTH


def save_settings(settings: Dict[str, Any]) -> None:
    """Save settings to JSON file."""
    try:
        with open(SETTINGS_FILE, "w") as f:
            json.dump(settings, f, indent=2)
    except Exception as e:
        print(f"{ERROR_SAVE_SETTINGS}: {str(e)}")


def load_settings() -> Dict[str, Any]:
    """Load settings from JSON file."""
    try:
        if os.path.exists(SETTINGS_FILE):
            with open(SETTINGS_FILE, "r") as f:
                settings = json.load(f)
                return (
                    settings if isinstance(settings, dict) else get_default_settings()
                )
        else:
            # Return default settings if file doesn't exist
            default_settings = get_default_settings()
            save_settings(default_settings)
            return default_settings
    except Exception as e:
        print(f"{ERROR_LOAD_SETTINGS}: {str(e)}")
        return get_default_settings()


def get_default_settings() -> Dict[str, Any]:
    """Get default settings."""
    return {
        "selected_model": DEFAULT_MODEL,
        "iterations": DEFAULT_ITERATIONS,
        "patience": DEFAULT_PATIENCE,
        "use_cache": DEFAULT_USE_CACHE,
    }


def save_input_history(history: List[str]) -> None:
    """Save input history to JSON file."""
    try:
        with open(HISTORY_FILE, "w") as f:
            json.dump(history, f, indent=2)
    except Exception as e:
        print(f"{ERROR_SAVE_HISTORY}: {str(e)}")


def load_input_history() -> List[str]:
    """Load input history from JSON file."""
    try:
        if os.path.exists(HISTORY_FILE):
            with open(HISTORY_FILE, "r") as f:
                history = json.load(f)
                return history if isinstance(history, list) else []
        else:
            return []
    except Exception as e:
        print(f"{ERROR_LOAD_HISTORY}: {str(e)}")
        return []


def add_to_input_history(history: List[str], new_input: str) -> List[str]:
    """
    Add a new input to history, maintaining max size and avoiding duplicates.

    Args:
        history: Current history list
        new_input: New input text to add

    Returns:
        Updated history list with new input at the beginning
    """
    # Strip whitespace from input
    new_input = new_input.strip()

    # Don't add empty strings
    if not new_input:
        return history

    # Remove duplicate if it exists
    if new_input in history:
        history.remove(new_input)

    # Add to beginning of list
    updated_history = [new_input] + history

    # Trim to max size
    if len(updated_history) > MAX_HISTORY_ITEMS:
        updated_history = updated_history[:MAX_HISTORY_ITEMS]

    return updated_history