# plugins.py
# ------------------------------------------------------------------
# Generic plugin framework for AnyCoder AI
# ------------------------------------------------------------------
from __future__ import annotations

import importlib
import os
from abc import ABC, abstractmethod
from typing import Dict, List, Type

# ------------------------------------------------------------------ #
# 1  Base plugin interface
# ------------------------------------------------------------------ #
class Plugin(ABC):
    """
    Abstract base class for AnyCoder runtime plugins.

    Required attributes (class‑level):
    ----------------------------------
    name        : str – unique key (used to invoke the plugin)
    description : str – short human description
    """

    name: str
    description: str

    # ---- lifecycle ----------------------------------------------------
    @abstractmethod
    def initialize(self, config: Dict | None = None) -> None:
        """Called once at start‑up.  Use for auth / heavy setup."""
        ...

    @abstractmethod
    def execute(self, **kwargs) -> Dict:
        """
        Execute plugin action.  Must return a JSON‑serialisable dict.

        `**kwargs` are passed from the caller verbatim.
        """
        ...


# ------------------------------------------------------------------ #
# 2  Plugin manager
# ------------------------------------------------------------------ #
class PluginManager:
    """
    Discovers *.py files under `plugins_dir`, registers concrete Plugin
    subclasses, initialises them (once), and lets the app invoke them.
    """

    def __init__(self, plugins_dir: str = "plugins") -> None:
        self.plugins_dir = plugins_dir
        self._registry: Dict[str, Type[Plugin]] = {}
        self._instances: Dict[str, Plugin] = {}

    # ---------- discovery ---------------------------------------------
    def discover(self) -> None:
        """Import every *.py file in `plugins_dir` (non‑private)."""
        if not os.path.isdir(self.plugins_dir):
            return

        for filename in os.listdir(self.plugins_dir):
            if filename.startswith("_") or not filename.endswith(".py"):
                continue

            module_path = f"{self.plugins_dir}.{filename[:-3]}"
            try:
                module = importlib.import_module(module_path)
            except Exception as exc:  # pragma: no cover
                print(f"[PLUGIN] Failed to import {module_path}: {exc}")
                continue

            # Register any subclasses of Plugin
            for attr in dir(module):
                obj = getattr(module, attr)
                if (
                    isinstance(obj, type)
                    and issubclass(obj, Plugin)
                    and obj is not Plugin
                ):
                    self.register(obj)

    # ---------- registry ----------------------------------------------
    def register(self, plugin_cls: Type[Plugin]) -> None:
        key = plugin_cls.name
        if not key:
            raise ValueError("Plugin class missing `.name` attribute.")
        self._registry[key] = plugin_cls

    def initialize_all(self, config: Dict | None = None) -> None:
        for name, cls in self._registry.items():
            try:
                inst = cls()
                inst.initialize(config or {})
                self._instances[name] = inst
            except Exception as exc:  # pragma: no cover
                print(f"[PLUGIN] Init failed for {name}: {exc}")

    # ---------- public API --------------------------------------------
    def list_plugins(self) -> List[str]:
        return list(self._registry)

    def execute(self, name: str, **kwargs) -> Dict:
        if name not in self._instances:
            raise ValueError(f"Plugin '{name}' is not initialised.")
        return self._instances[name].execute(**kwargs)


# ------------------------------------------------------------------ #
# 3  Example built‑in plugin
# ------------------------------------------------------------------ #
class VSCodeSnippetPlugin(Plugin):
    """Generate VSCode snippet JSON for quick copy‑paste."""

    name = "vscode_snippets"
    description = "Produces VS Code snippet templates."

    def initialize(self, config: Dict | None = None) -> None:
        cfg = config or {}
        self.snippet_dir = cfg.get("snippet_dir", "./snippets")

    def execute(self, *, language: str = "python", snippet_name: str) -> Dict:
        path = os.path.join(self.snippet_dir, f"{language}.{snippet_name}.json")
        if os.path.isfile(path):
            with open(path, "r", encoding="utf-8") as fh:
                content = fh.read()
        else:
            content = '{ "prefix": "todo", "body": ["// add your snippet here"] }'
        return {"plugin": self.name, "snippet": content}


# ------------------------------------------------------------------ #
# 4  Global manager instance (auto‑discover on import)
# ------------------------------------------------------------------ #
plugin_manager = PluginManager()
plugin_manager.discover()
plugin_manager.initialize_all()