from __future__ import annotations

import json
from pathlib import Path
from typing import Any, Dict


DEFAULT_CONFIG: Dict[str, Any] = {
    "progress": {"enabled": True},
    "output": {
        "group_by_service": True,
        "max_deps_per_ecosystem": 20,
        "max_dev_deps_per_ecosystem": 10,

        "sections": {
            "show_service_separator": True,
            "show_service_header": True,
            "show_separator": False,
            "show_id_status": False,
            "show_created": False,
            "show_ports": False,
            "show_mounts": False,
            "show_versions": True,
            "show_language": False,
            "show_source": True,
            "show_revision": False,
            "show_deps_source": True,
            "show_manifests": True,
            "manifests_mode": "count",
            "show_raw_deps_count": False,
            "show_ecosystem_counts": True,
            "show_effective_deps_count": True,
            "show_deps_list": False,
            "show_dev_deps_list": False,
            "show_code_files": False,
            "show_osv_summary": True,
            "show_osv_top_affected": True,
            "show_osv_sample_ids": False,
            "show_errors": True,
        },
    },
    "vulns": {
        "min_severity": "MEDIUM",
        "include_unknown": True,
        "top_affected": 8,
    },
    "osv": {
        "chunk_size": 250,
        "hydrate_details": True,
        "max_hydrate_ids": 300,
    },
}


def _deep_merge(dst: Dict[str, Any], src: Dict[str, Any]) -> Dict[str, Any]:
    for k, v in src.items():
        if isinstance(v, dict) and isinstance(dst.get(k), dict):
            dst[k] = _deep_merge(dict(dst[k]), v)
        else:
            dst[k] = v
    return dst


def load_config(filename: str = "cvexplorer_config.json") -> Dict[str, Any]:
    cfg = json.loads(json.dumps(DEFAULT_CONFIG))  # deep copy
    path = Path.cwd() / filename
    if not path.exists():
        return cfg
    try:
        user_cfg = json.loads(path.read_text(encoding="utf-8"))
        if isinstance(user_cfg, dict):
            return _deep_merge(cfg, user_cfg)
        return cfg
    except Exception:
        return cfg