"""Configuration validation utilities."""

from typing import Dict, List, Optional, Tuple

# Valid routing policies
VALID_ROUTING_POLICIES = [
    "auto",
    ":fastest",
    ":cheapest",
    "groq",
    "together",
    "replicate",
    "cerebras",
    "fireworks",
    "deepinfra",
    "meta-llama/Llama-3.3-70B-Instruct",
]

# Valid model tiers
VALID_MODEL_TIERS = ["fast", "capable", "vision"]

# Valid LLM providers
VALID_LLM_PROVIDERS = ["openai", "anthropic", "huggingface", "qwen"]


def validate_routing_policy(policy: str) -> Tuple[bool, Optional[str]]:
    """
    Validate a routing policy.

    Args:
        policy: Routing policy string

    Returns:
        Tuple of (is_valid, error_message)
    """
    if not policy:
        return False, "Routing policy cannot be empty"

    # Check if it's a known policy
    if policy in VALID_ROUTING_POLICIES:
        return True, None

    # Check if it's a model path (provider/model format)
    if "/" in policy:
        parts = policy.split("/")
        if len(parts) >= 2:
            return True, None  # Assume it's a valid model path

    # Unknown policy
    return (
        False,
        f"Invalid routing policy: {policy}. Must be one of {VALID_ROUTING_POLICIES} or a provider/model path",
    )


def validate_model_tier(tier: str) -> Tuple[bool, Optional[str]]:
    """
    Validate a model tier.

    Args:
        tier: Model tier string

    Returns:
        Tuple of (is_valid, error_message)
    """
    if tier not in VALID_MODEL_TIERS:
        return False, f"Invalid model tier: {tier}. Must be one of {VALID_MODEL_TIERS}"

    return True, None


def validate_agent_routing_config(
    config: Dict[str, Dict[str, str]],
) -> Tuple[bool, Optional[str]]:
    """
    Validate agent routing configuration.

    Args:
        config: Dictionary mapping agent names to routing config

    Returns:
        Tuple of (is_valid, error_message)
    """
    if not isinstance(config, dict):
        return False, "Configuration must be a dictionary"

    for agent_name, agent_config in config.items():
        if not isinstance(agent_config, dict):
            return False, f"Configuration for {agent_name} must be a dictionary"

        # Validate routing policy
        if "routing_policy" not in agent_config:
            return False, f"Missing routing_policy for {agent_name}"

        is_valid, error = validate_routing_policy(agent_config["routing_policy"])
        if not is_valid:
            return False, f"{agent_name}: {error}"

        # Validate model tier (optional)
        if "model_tier" in agent_config:
            is_valid, error = validate_model_tier(agent_config["model_tier"])
            if not is_valid:
                return False, f"{agent_name}: {error}"

    return True, None


def validate_llm_provider(provider: str) -> Tuple[bool, Optional[str]]:
    """
    Validate LLM provider.

    Args:
        provider: Provider name

    Returns:
        Tuple of (is_valid, error_message)
    """
    if provider not in VALID_LLM_PROVIDERS:
        return (
            False,
            f"Invalid LLM provider: {provider}. Must be one of {VALID_LLM_PROVIDERS}",
        )

    return True, None


def validate_configuration(config: Dict) -> Tuple[bool, Optional[str]]:
    """
    Validate complete configuration.

    Args:
        config: Full configuration dictionary

    Returns:
        Tuple of (is_valid, error_message)
    """
    # Validate LLM provider
    if "llm_provider" in config:
        is_valid, error = validate_llm_provider(config["llm_provider"])
        if not is_valid:
            return False, error

    # Validate routing policy (global)
    if "routing_policy" in config:
        is_valid, error = validate_routing_policy(config["routing_policy"])
        if not is_valid:
            return False, error

    # Validate per-agent routing config
    if "agent_routing_config" in config:
        is_valid, error = validate_agent_routing_config(config["agent_routing_config"])
        if not is_valid:
            return False, error

    # Validate indicator parameters
    if "indicator_parameters" in config:
        params = config["indicator_parameters"]
        if not isinstance(params, dict):
            return False, "indicator_parameters must be a dictionary"

        # Check RSI period
        if "rsi_period" in params:
            rsi = params["rsi_period"]
            if not isinstance(rsi, int) or rsi < 2 or rsi > 100:
                return False, "RSI period must be between 2 and 100"

        # Check MACD parameters
        if "macd_fast" in params:
            fast = params["macd_fast"]
            if not isinstance(fast, int) or fast < 2 or fast > 50:
                return False, "MACD fast period must be between 2 and 50"

        if "macd_slow" in params:
            slow = params["macd_slow"]
            if not isinstance(slow, int) or slow < 10 or slow > 100:
                return False, "MACD slow period must be between 10 and 100"

        if "macd_signal" in params:
            signal = params["macd_signal"]
            if not isinstance(signal, int) or signal < 2 or signal > 50:
                return False, "MACD signal period must be between 2 and 50"

    return True, None