import os
import platform
import logging
from typing import List, Dict, Any

logger = logging.getLogger(__name__)


class NativePluginScanner:
    """Quét thư mục custom chứa VST3 (.vst3) / Audio Unit (.component trên macOS)
    — spec DESKTOP VST (2026-08-08): POST /api/v1/desktop/plugins/scan."""

    def __init__(self):
        self.os_type = platform.system()  # 'Linux', 'Windows', 'Darwin'

    def scan_directories(self, target_paths: List[str]) -> List[Dict[str, Any]]:
        found_plugins = []
        seen = set()

        for base_path in target_paths:
            if not base_path:
                continue
            if not os.path.exists(base_path):
                logger.warning(f"Scan path does not exist: {base_path}")
                continue

            for root, dirs, files in os.walk(base_path):
                for dir_name in dirs:
                    full_path = os.path.join(root, dir_name)

                    # VST3 = bundle directory *.vst3
                    if dir_name.endswith('.vst3'):
                        plugin_name = dir_name[:-5]
                        pid = f"vst3_{plugin_name.lower().replace(' ', '_')}"
                        if pid in seen:
                            continue
                        seen.add(pid)
                        found_plugins.append({
                            "id": pid,
                            "name": plugin_name,
                            "type": "VST3",
                            "format": "VST3",
                            "category": "Instrument",
                            "vendor": self._read_vendor(full_path) or None,
                            "path": full_path,
                            "is_instrument": True,
                            "has_native_gui": True
                        })
                    # Audio Unit = bundle *.component (macOS only)
                    elif dir_name.endswith('.component') and self.os_type == 'Darwin':
                        plugin_name = dir_name[:-10]
                        pid = f"au_{plugin_name.lower().replace(' ', '_')}"
                        if pid in seen:
                            continue
                        seen.add(pid)
                        found_plugins.append({
                            "id": pid,
                            "name": plugin_name,
                            "type": "AU",
                            "format": "AudioUnit",
                            "category": "Instrument",
                            "vendor": self._read_vendor(full_path) or None,
                            "path": full_path,
                            "is_instrument": True,
                            "has_native_gui": True
                        })

        return found_plugins

    @staticmethod
    def _read_vendor(bundle_path: str) -> str:
        """Đọc vendor từ Info.plist nếu có (macOS) — best-effort."""
        try:
            plist = os.path.join(bundle_path, "Contents", "Info.plist")
            if os.path.exists(plist):
                with open(plist, "rb") as f:
                    raw = f.read(65536)
                import plistlib
                try:
                    data = plistlib.loads(raw)
                    return data.get("CFBundleManufacturer") or data.get("NSHumanReadableCopyright")
                except Exception:
                    return None
        except Exception:
            return None
        return None