import os
from fastapi import APIRouter, Depends, HTTPException, Query
from ..dependencies import require_admin
from ..models.user import User
from ..config import get_settings

router = APIRouter(prefix="/api/logs", tags=["logs"])

_LOG_FILES = {
    "app": "app.log",
    "matching": "matching.log",
}


@router.get("/{log_name}")
async def get_log(
    log_name: str,
    lines: int = Query(300, ge=10, le=5000),
    _admin: User = Depends(require_admin),
):
    if log_name not in _LOG_FILES:
        raise HTTPException(status_code=404, detail="Unbekannte Log-Datei")

    settings = get_settings()
    path = os.path.join(settings.log_dir, _LOG_FILES[log_name])

    if not os.path.exists(path):
        return {"lines": [], "total": 0, "showing": 0, "exists": False, "path": path}

    with open(path, "r", encoding="utf-8", errors="replace") as f:
        all_lines = f.readlines()

    last = all_lines[-lines:]
    return {
        "lines": [l.rstrip("\n") for l in last],
        "total": len(all_lines),
        "showing": len(last),
        "exists": True,
        "path": path,
    }


@router.delete("/{log_name}")
async def clear_log(
    log_name: str,
    _admin: User = Depends(require_admin),
):
    if log_name not in _LOG_FILES:
        raise HTTPException(status_code=404, detail="Unbekannte Log-Datei")

    settings = get_settings()
    path = os.path.join(settings.log_dir, _LOG_FILES[log_name])

    if os.path.exists(path):
        open(path, "w").close()

    return {"success": True}