r"""User plugin loader — mirror of the Rust plugin system.

Plugins live in `<APP_CONFIG_DIR>/plugins/<name>/commands.yaml` and follow the
exact same YAML schema as the bundled `commands.yaml`. The user can drop new
voice command packs in there without touching the project tree.

Layout (per pack):

    <APP_CONFIG_DIR>/plugins/
        <pack_name>/
            commands.yaml          (required — top-level dict, same schema)
            disabled               (optional empty file — pack is skipped)
            ...                    (any helper files referenced by handlers)

Discovery is tolerant: a malformed yaml logs a warning and the pack is skipped;
it never breaks the rest of the loader.

`APP_CONFIG_DIR` resolves to `%APPDATA%\com.priler.jarvis\plugins\` on Windows,
matching the Rust fork — so a single plugins folder can serve both installs.

The id-collision policy is "first wins, plugin loses": a plugin cannot override
a built-in command id. This protects against drive-by replacement of e.g.
`open_browser` by a malicious pack.
"""

import os
import yaml
from typing import Dict, List, Tuple

PLUGINS_DIR_NAME = "plugins"
DISABLED_FLAG = "disabled"


def app_config_dir() -> str:
    """Returns the per-user config dir matching the Rust fork's APP_CONFIG_DIR.

    On Windows this is `%APPDATA%\\com.priler.jarvis\\`. We don't depend on
    platform-dirs here — std env vars are enough.
    """
    appdata = os.environ.get("APPDATA")
    if appdata:
        return os.path.join(appdata, "com.priler.jarvis")
    # fallback for non-Windows or unusual environments
    return os.path.join(os.path.expanduser("~"), ".config", "com.priler.jarvis")


def plugins_dir() -> str:
    """Returns `<APP_CONFIG_DIR>/plugins/`, creating it lazily."""
    d = os.path.join(app_config_dir(), PLUGINS_DIR_NAME)
    try:
        os.makedirs(d, exist_ok=True)
    except OSError:
        pass
    return d


def discover() -> Dict[str, dict]:
    """Walks `plugins_dir()` and returns a merged dict of command_id -> entry.

    Caller is expected to merge this into the main VA_CMD_LIST.
    """
    return discover_in(plugins_dir())


def discover_in(directory: str) -> Dict[str, dict]:
    """Like `discover` but takes an explicit directory — used by tests."""
    merged: Dict[str, dict] = {}
    if not os.path.isdir(directory):
        return merged

    for name in sorted(os.listdir(directory)):
        pack_path = os.path.join(directory, name)
        if not os.path.isdir(pack_path):
            continue
        if os.path.isfile(os.path.join(pack_path, DISABLED_FLAG)):
            continue
        yaml_path = os.path.join(pack_path, "commands.yaml")
        if not os.path.isfile(yaml_path):
            continue
        try:
            with open(yaml_path, "rt", encoding="utf8") as f:
                data = yaml.safe_load(f) or {}
        except (OSError, yaml.YAMLError) as e:
            print(f"[plugins] failed to load {yaml_path}: {e}")
            continue
        if not isinstance(data, dict):
            print(f"[plugins] {yaml_path}: top-level must be a dict; skipping")
            continue
        for cmd_id, entry in data.items():
            if not isinstance(cmd_id, str) or not isinstance(entry, dict):
                continue
            if cmd_id in merged:
                print(f"[plugins] duplicate id '{cmd_id}' across packs; first wins")
                continue
            merged[cmd_id] = entry

    return merged


def list_packs() -> List[dict]:
    """Light listing for the (eventual) Python GUI: name + enabled + count."""
    return list_packs_in(plugins_dir())


def list_packs_in(directory: str) -> List[dict]:
    out: List[dict] = []
    if not os.path.isdir(directory):
        return out
    for name in sorted(os.listdir(directory)):
        pack_path = os.path.join(directory, name)
        if not os.path.isdir(pack_path):
            continue
        yaml_path = os.path.join(pack_path, "commands.yaml")
        if not os.path.isfile(yaml_path):
            continue
        enabled = not os.path.isfile(os.path.join(pack_path, DISABLED_FLAG))
        count = 0
        error = None
        try:
            with open(yaml_path, "rt", encoding="utf8") as f:
                data = yaml.safe_load(f) or {}
            if isinstance(data, dict):
                count = sum(1 for v in data.values() if isinstance(v, dict))
            else:
                error = "top-level must be a dict"
        except (OSError, yaml.YAMLError) as e:
            error = str(e)
        out.append(
            {
                "name": name,
                "path": pack_path,
                "enabled": enabled,
                "command_count": count,
                "error": error,
            }
        )
    return out


def set_enabled(name: str, enabled: bool) -> Tuple[bool, str]:
    """Toggle the `disabled` flag for a pack. Returns (ok, message)."""
    pack = os.path.join(plugins_dir(), name)
    if not os.path.isdir(pack):
        return False, f"plugin '{name}' not found"
    flag = os.path.join(pack, DISABLED_FLAG)
    try:
        if enabled and os.path.isfile(flag):
            os.remove(flag)
        elif not enabled and not os.path.isfile(flag):
            with open(flag, "w", encoding="utf8") as f:
                f.write("")
        return True, "ok"
    except OSError as e:
        return False, str(e)