"""Auto-Discovery Plugin-Loader fuer Hausmeister-Bot Tools.

Laedt alle tools/*.py Dateien und sammelt:
- TOOLS: Tool-Definitionen fuer das LLM
- HANDLERS / get_handlers(): Handler-Funktionen
- SYSTEM_PROMPT_EXTRA: Zusaetzliche Prompt-Abschnitte
"""

import importlib
import os
import glob
import logging

log = logging.getLogger("tool_loader")

_cache = {"tools": None, "prompt": None, "modules": None}


def _discover_modules():
    if _cache["modules"] is not None:
        return _cache["modules"]

    tools_dir = os.path.join(os.path.dirname(__file__), "tools")
    modules = []

    for path in sorted(glob.glob(os.path.join(tools_dir, "*.py"))):
        name = os.path.basename(path)[:-3]
        if name.startswith("_"):
            continue
        try:
            mod = importlib.import_module(f"tools.{name}")
            modules.append(mod)
            log.debug("Geladen: tools/%s (%d Tools)", name,
                      len(getattr(mod, "TOOLS", [])))
        except Exception as e:
            log.error("Fehler beim Laden von tools/%s: %s", name, e)

    _cache["modules"] = modules
    log.info("%d Tool-Module geladen", len(modules))
    return modules


def get_tools() -> list:
    """Alle Tool-Definitionen fuer das LLM."""
    if _cache["tools"] is not None:
        return _cache["tools"]

    all_tools = []
    for mod in _discover_modules():
        all_tools.extend(getattr(mod, "TOOLS", []))

    _cache["tools"] = all_tools
    return all_tools


def get_extra_prompt() -> str:
    """Alle SYSTEM_PROMPT_EXTRA Abschnitte zusammengefuegt."""
    if _cache["prompt"] is not None:
        return _cache["prompt"]

    parts = []
    for mod in _discover_modules():
        extra = getattr(mod, "SYSTEM_PROMPT_EXTRA", "")
        if extra:
            parts.append(extra.strip())

    _cache["prompt"] = "\n\n".join(parts)
    return _cache["prompt"]


def get_handlers(session_id: str = None) -> dict:
    """Alle Handler-Funktionen. Wird pro Request aufgerufen (session_id kann variieren)."""
    all_handlers = {}
    for mod in _discover_modules():
        factory = getattr(mod, "get_handlers", None)
        if factory:
            all_handlers.update(factory(session_id=session_id))
        else:
            all_handlers.update(getattr(mod, "HANDLERS", {}))

    return all_handlers