from __future__ import annotations

from pathlib import Path

ALLOWED_LOG_FILES = {
    "monitor.log": Path("/home/theshy/biliup/logs/system/monitor.log"),
    "monitorSrt.log": Path("/home/theshy/biliup/logs/system/monitorSrt.log"),
    "monitorSongs.log": Path("/home/theshy/biliup/logs/system/monitorSongs.log"),
    "upload.log": Path("/home/theshy/biliup/logs/system/upload.log"),
    "session_top_comment.py.log": Path("/home/theshy/biliup/logs/system/session_top_comment.py.log"),
    "add_to_collection.py.log": Path("/home/theshy/biliup/logs/system/add_to_collection.py.log"),
}


class LogReader:
    def list_logs(self) -> dict[str, object]:
        return {
            "items": [
                {
                    "name": name,
                    "path": str(path),
                    "exists": path.exists(),
                }
                for name, path in sorted(ALLOWED_LOG_FILES.items())
            ]
        }

    def tail(self, name: str, lines: int = 200, contains: str | None = None) -> dict[str, object]:
        if name not in ALLOWED_LOG_FILES:
            raise ValueError(f"unsupported log: {name}")
        path = ALLOWED_LOG_FILES[name]
        if not path.exists():
            return {"name": name, "path": str(path), "exists": False, "content": ""}
        content = path.read_text(encoding="utf-8", errors="replace").splitlines()
        if contains:
            content = [line for line in content if contains in line]
        return {
            "name": name,
            "path": str(path),
            "exists": True,
            "content": "\n".join(content[-max(1, min(lines, 1000)):]),
        }