"""Configuration resolution shared by CLI and MCP entrypoints."""

from __future__ import annotations

from pathlib import Path

from obsidian_wiki.file_assets import clean_config_value

GLOBAL_CONFIG = Path.home() / ".obsidian-wiki" / "config"


def parse_config_file(path: Path) -> dict[str, str]:
    values: dict[str, str] = {}
    if not path.is_file():
        return values
    for raw in path.read_text(encoding="utf-8", errors="ignore").splitlines():
        line = raw.strip()
        if not line or line.startswith("#") or "=" not in line:
            continue
        key, value = line.split("=", 1)
        values[key.strip()] = clean_config_value(value)
    return values


def find_config(start: str | Path | None = None) -> Path | None:
    """Resolve config using the llm-wiki protocol."""
    current = Path(start or Path.cwd()).expanduser().resolve()
    if current.is_file():
        current = current.parent
    home = Path.home().resolve()

    while True:
        candidate = current / ".env"
        if candidate.is_file() and parse_config_file(candidate).get("OBSIDIAN_VAULT_PATH"):
            return candidate
        if current == home or current.parent == current:
            break
        current = current.parent

    if GLOBAL_CONFIG.is_file():
        return GLOBAL_CONFIG
    return None


def load_config(start: str | Path | None = None) -> dict[str, str]:
    path = find_config(start)
    return parse_config_file(path) if path else {}


def resolve_vault_path(cli_vault: str | None = None, *, start: str | Path | None = None) -> str:
    if cli_vault:
        return str(Path(clean_config_value(cli_vault)).expanduser())
    config = load_config(start)
    return config.get("OBSIDIAN_VAULT_PATH", "")


def config_value(key: str, default: str = "", *, start: str | Path | None = None) -> str:
    return load_config(start).get(key, default)