"""HTTP LLM providers for the CS Kiosk."""

from __future__ import annotations

from typing import Any, Dict, Type

from .base import (
    BaseLLM,
    ChatMessage,
    LLMResponse,
    MessageRole,
    ProviderConfig,
    ToolCall,
)
from .echo import EchoProvider
from .gpt import OpenAIChat
from .claude import ClaudeProvider
from .gemini import GeminiGenerative

_PROVIDER_REGISTRY: Dict[str, Dict[str, Any]] = {
    "claude": {
        "id": "claude",
        "name": "Anthropic Claude",
        "cls": ClaudeProvider,
        "default_model": "claude-haiku-4-5",
        "supports_tools": True,
    },
    "gpt": {
        "id": "gpt",
        "name": "OpenAI GPT",
        "cls": OpenAIChat,
        "default_model": "gpt-4.1-mini",
        "supports_tools": True,
    },
    "gemini": {
        "id": "gemini",
        "name": "Google Gemini",
        "cls": GeminiGenerative,
        "default_model": "gemini-2.0-flash",
        "supports_tools": True,
    },
    "echo": {
        "id": "echo",
        "name": "Echo (development)",
        "cls": EchoProvider,
        "default_model": "echo",
        "supports_tools": True,
    },
}

_PROVIDER_ALIASES: Dict[str, str] = {
    "anthropic": "claude",
    "claude": "claude",
    "openai": "gpt",
    "gpt": "gpt",
    "google": "gemini",
    "gemini": "gemini",
    "echo": "echo",
    "mock": "echo",
}


def normalize_provider_name(name: str) -> str:
    """Return the canonical provider id for a user-supplied name."""

    return _PROVIDER_ALIASES.get(name.lower(), name.lower())


def available_providers() -> Dict[str, Dict[str, Any]]:
    """Metadata describing the providers registered with the backend."""

    providers: Dict[str, Dict[str, Any]] = {}
    for key, meta in _PROVIDER_REGISTRY.items():
        exported = {k: v for k, v in meta.items() if k != "cls"}
        providers[key] = exported
    return providers


def get_provider(name: str, config: ProviderConfig) -> BaseLLM:
    """Instantiate a provider client by name."""

    canonical = normalize_provider_name(name)
    entry = _PROVIDER_REGISTRY.get(canonical)
    if not entry:
        raise ValueError(f"Unsupported provider '{name}'.")
    provider_cls: Type[BaseLLM] = entry["cls"]
    return provider_cls(config)


__all__ = [
    "BaseLLM",
    "ChatMessage",
    "LLMResponse",
    "MessageRole",
    "ProviderConfig",
    "ToolCall",
    "EchoProvider",
    "OpenAIChat",
    "ClaudeProvider",
    "GeminiGenerative",
    "available_providers",
    "get_provider",
    "normalize_provider_name",
]