"""
Server Control API Router

Provides endpoints for server status and control operations.
"""

import logging
import os
import time
from datetime import datetime
from typing import Optional

from fastapi import APIRouter
from fastapi.responses import JSONResponse
from pydantic import BaseModel

from ..app import VERSION

logger = logging.getLogger("CamoufoxLauncher")

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

# Track server start time
_SERVER_START_TIME: Optional[float] = None


def _init_start_time() -> None:
    """Initialize server start time (called once at startup)."""
    global _SERVER_START_TIME
    if _SERVER_START_TIME is None:
        _SERVER_START_TIME = time.time()


_init_start_time()


class ServerStatus(BaseModel):
    """Server status information."""

    status: str
    uptime_seconds: float
    uptime_formatted: str
    launch_mode: str
    server_port: int
    stream_port: int
    version: str
    python_version: str
    started_at: str


class RestartRequest(BaseModel):
    """Restart request with mode."""

    mode: str = "headless"  # headless, debug, virtual_display
    confirm: bool = False


def _format_uptime(seconds: float) -> str:
    """Format uptime in human-readable format."""
    days = int(seconds // 86400)
    hours = int((seconds % 86400) // 3600)
    minutes = int((seconds % 3600) // 60)
    secs = int(seconds % 60)

    parts = []
    if days > 0:
        parts.append(f"{days}d")
    if hours > 0:
        parts.append(f"{hours}h")
    if minutes > 0:
        parts.append(f"{minutes}m")
    parts.append(f"{secs}s")

    return " ".join(parts)


@router.get("/status")
async def get_server_status() -> JSONResponse:
    """Get server status information."""
    import sys

    uptime = time.time() - (_SERVER_START_TIME or time.time())
    started_at = datetime.fromtimestamp(_SERVER_START_TIME or time.time())

    status = ServerStatus(
        status="running",
        uptime_seconds=round(uptime, 2),
        uptime_formatted=_format_uptime(uptime),
        launch_mode=os.environ.get("LAUNCH_MODE", "unknown"),
        server_port=int(
            os.environ.get("SERVER_PORT_INFO", os.environ.get("PORT", 2048))
        ),
        stream_port=int(os.environ.get("STREAM_PORT", 3120)),
        version=VERSION,
        python_version=f"{sys.version_info.major}.{sys.version_info.minor}.{sys.version_info.micro}",
        started_at=started_at.isoformat(),
    )

    return JSONResponse(content=status.model_dump())


@router.post("/restart")
async def restart_server(request: RestartRequest) -> JSONResponse:
    """
    Request server restart.

    Note: This operation terminates the current process and requires an external process manager to restart.
    """
    if not request.confirm:
        return JSONResponse(
            content={
                "success": False,
                "message": "Restart operation requires confirmation. Please set confirm=true",
            },
            status_code=400,
        )

    valid_modes = ["headless", "debug", "virtual_display"]
    if request.mode not in valid_modes:
        return JSONResponse(
            content={
                "success": False,
                "message": f"Invalid launch mode. Valid options: {valid_modes}",
            },
            status_code=400,
        )

    logger.info(f"[Server] Received restart request, target mode: {request.mode}")

    # Set environment variable for next launch
    os.environ["REQUESTED_RESTART_MODE"] = request.mode

    # Return success - actual restart needs to be handled by process manager
    return JSONResponse(
        content={
            "success": True,
            "message": f"Server will restart in {request.mode} mode. Please refresh the page.",
            "mode": request.mode,
        }
    )