"""
sshx-link dashboard backend
===========================
FastAPI routes for starting sshx and returning the share link.
"""

import asyncio
import subprocess
import re
import shutil
import logging
from fastapi import APIRouter
from fastapi.responses import JSONResponse

logger = logging.getLogger(__name__)
router = APIRouter()

# Keep track of running sshx process
_sshx_process = None
_sshx_link = None


def _find_link(text: str) -> str | None:
    """Extract sshx link from output."""
    match = re.search(r"https://sshx\.io/s/[A-Za-z0-9_-]+", text)
    return match.group(0) if match else None


def _ensure_sshx() -> bool:
    """Install sshx if not present."""
    if shutil.which("sshx"):
        return True
    try:
        subprocess.run(
            ["sh", "-c", "curl -sSf https://sshx.io/get | sh"],
            capture_output=True,
            timeout=60,
        )
        return shutil.which("sshx") is not None
    except Exception as e:
        logger.error("sshx install failed: %s", e)
        return False


@router.get("/start")
async def start_sshx():
    """Start sshx serve and return the share link."""
    global _sshx_process, _sshx_link

    # Already running
    if _sshx_process and _sshx_process.poll() is None and _sshx_link:
        return {"status": "running", "link": _sshx_link}

    # Install if needed
    if not _ensure_sshx():
        return JSONResponse(
            status_code=500,
            content={"status": "error", "message": "Failed to install sshx"},
        )

    # Kill old process if any
    if _sshx_process and _sshx_process.poll() is None:
        _sshx_process.terminate()
        _sshx_process.wait(timeout=5)

    # Start sshx serve
    _sshx_process = subprocess.Popen(
        ["sshx", "serve"],
        stdout=subprocess.PIPE,
        stderr=subprocess.STDOUT,
        text=True,
        bufsize=1,
    )

    _sshx_link = None

    # Read output in background thread, await link
    loop = asyncio.get_event_loop()
    link_future = loop.create_future()

    def _reader():
        global _sshx_link
        for line in _sshx_process.stdout:
            line = line.strip()
            link = _find_link(line)
            if link:
                _sshx_link = link
                if not link_future.done():
                    link_future.set_result(link)
                return
        if not link_future.done():
            link_future.set_exception RuntimeError("sshx exited without link")

    import threading
    threading.Thread(target=_reader, daemon=True).start()

    try:
        link = await asyncio.wait_for(link_future, timeout=30)
        return {"status": "running", "link": link}
    except asyncio.TimeoutError:
        return JSONResponse(
            status_code=504,
            content={"status": "error", "message": "sshx did not return a link in time"},
        )
    except Exception as e:
        return JSONResponse(
            status_code=500,
            content={"status": "error", "message": str(e)},
        )


@router.get("/status")
async def sshx_status():
    """Check if sshx is running and return the link."""
    global _sshx_process, _sshx_link

    if _sshx_process and _sshx_process.poll() is None and _sshx_link:
        return {"status": "running", "link": _sshx_link}
    return {"status": "stopped", "link": None}


@router.post("/stop")
async def stop_sshx():
    """Stop the running sshx process."""
    global _sshx_process, _sshx_link

    if _sshx_process and _sshx_process.poll() is None:
        _sshx_process.terminate()
        try:
            _sshx_process.wait(timeout=5)
        except subprocess.TimeoutExpired:
            _sshx_process.kill()
        _sshx_process = None
        _sshx_link = None
        return {"status": "stopped"}
    return {"status": "already_stopped"}