from __future__ import annotations

import os
import secrets
import socket
import threading
import time
import warnings
from pathlib import Path
from typing import Any

import httpx
import uvicorn
from uvicorn.config import Config

from trackio._vendor.gradio_exceptions import ChecksumMismatchError
from trackio._vendor.networking import normalize_share_url, setup_tunnel, url_ok
from trackio._vendor.tunneling import BINARY_PATH
from trackio.launch_utils import colab_check, is_hosted_notebook

INITIAL_PORT_VALUE = int(os.getenv("GRADIO_SERVER_PORT", "7860"))
TRY_NUM_PORTS = int(os.getenv("GRADIO_NUM_PORTS", "100"))
LOCALHOST_NAME = os.getenv("GRADIO_SERVER_NAME", "127.0.0.1")


class _UvicornServer(uvicorn.Server):
    def install_signal_handlers(self) -> None:
        pass

    def run_in_thread(self) -> None:
        self.thread = threading.Thread(target=self.run, daemon=True)
        self.thread.start()
        start = time.time()
        while not self.started:
            time.sleep(1e-3)
            if time.time() - start > 60:
                raise RuntimeError(
                    "Server failed to start. Please check that the port is available."
                )


def _bind_host(server_name: str) -> str:
    if server_name.startswith("[") and server_name.endswith("]"):
        return server_name[1:-1]
    return server_name


def start_server(
    app: Any,
    server_name: str | None = None,
    server_port: int | None = None,
    ssl_keyfile: str | None = None,
    ssl_certfile: str | None = None,
    ssl_keyfile_password: str | None = None,
) -> tuple[str, int, str, _UvicornServer]:
    server_name = server_name or LOCALHOST_NAME
    url_host_name = "localhost" if server_name == "0.0.0.0" else server_name

    host = _bind_host(server_name)

    server_ports = (
        [server_port]
        if server_port is not None
        else range(INITIAL_PORT_VALUE, INITIAL_PORT_VALUE + TRY_NUM_PORTS)
    )

    port_used = None
    server = None
    for port in server_ports:
        try:
            socket_family = socket.AF_INET6 if ":" in host else socket.AF_INET
            with socket.socket(socket_family, socket.SOCK_STREAM) as s:
                s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
                s.bind((host, port))
            config = Config(
                app=app,
                port=port,
                host=host,
                log_level="warning",
                ssl_keyfile=ssl_keyfile,
                ssl_certfile=ssl_certfile,
                ssl_keyfile_password=ssl_keyfile_password,
            )
            server = _UvicornServer(config=config)
            server.run_in_thread()
            port_used = port
            break
        except (OSError, RuntimeError):
            continue
    else:
        raise OSError(
            f"Cannot find empty port in range: {min(server_ports)}-{max(server_ports)}. "
            "Set GRADIO_SERVER_PORT or pass server_port to trackio.show()."
        )

    assert port_used is not None and server is not None

    if ssl_keyfile is not None:
        path_to_local_server = f"https://{url_host_name}:{port_used}/"
    else:
        path_to_local_server = f"http://{url_host_name}:{port_used}/"

    return server_name, port_used, path_to_local_server, server


def launch_trackio_dashboard(
    starlette_app: Any,
    *,
    server_name: str | None = None,
    server_port: int | None = None,
    share: bool | None = None,
    share_server_address: str | None = None,
    share_server_protocol: str | None = None,
    share_server_tls_certificate: str | None = None,
    mcp_server: bool = False,
    ssl_verify: bool = True,
    quiet: bool = False,
) -> tuple[str | None, str | None, str | None, Any]:
    is_colab = colab_check()
    is_hosted_nb = is_hosted_notebook()
    space_id = os.getenv("SPACE_ID")

    if share is None:
        if is_colab or is_hosted_nb:
            if not quiet:
                print(
                    "It looks like you are running Trackio on a hosted Jupyter notebook, which requires "
                    "`share=True`. Automatically setting `share=True` "
                    "(set `share=False` in `show()` to disable).\n"
                )
            share = True
        else:
            share = os.getenv("GRADIO_SHARE", "").lower() == "true"

    sn = server_name
    if sn is None and os.getenv("SYSTEM") == "spaces":
        sn = "0.0.0.0"
    elif sn is None:
        sn = LOCALHOST_NAME

    server_name_r, server_port_r, local_url, uv_server = start_server(
        starlette_app,
        server_name=sn,
        server_port=server_port,
    )

    local_api_url = f"{local_url.rstrip('/')}/api/"
    try:
        httpx.get(f"{local_url.rstrip('/')}/version", verify=ssl_verify, timeout=10)
    except Exception as e:
        raise RuntimeError(
            f"Could not reach Trackio server at {local_url.rstrip('/')}/version: {e}"
        ) from e

    if share and space_id:
        warnings.warn("Setting share=True is not supported on Hugging Face Spaces")
        share = False

    share_url: str | None = None
    if share:
        try:
            share_tok = secrets.token_urlsafe(32)
            proto = share_server_protocol or (
                "http" if share_server_address is not None else "https"
            )
            raw = setup_tunnel(
                local_host=server_name_r,
                local_port=server_port_r,
                share_token=share_tok,
                share_server_address=share_server_address,
                share_server_tls_certificate=share_server_tls_certificate,
            )
            share_url = normalize_share_url(raw, proto)
            if not quiet:
                print(f"* Running on public URL: {share_url}")
                print(
                    "\nThis share link expires in 1 week. For permanent hosting, deploy to Hugging Face Spaces."
                )
        except Exception as e:
            share_url = None
            if not quiet:
                if isinstance(e, ChecksumMismatchError):
                    print(
                        "\nCould not create share link. Checksum mismatch for frpc binary."
                    )
                elif Path(BINARY_PATH).exists():
                    print(
                        "\nCould not create share link. Check your internet connection or https://status.gradio.app."
                    )
                else:
                    print(
                        f"\nCould not create share link. Missing frpc at {BINARY_PATH}. {e}"
                    )

    if not share_url and not quiet:
        print("* To create a public link, set `share=True` in `trackio.show()`.")

    return local_url, share_url, local_api_url, uv_server


def url_ok_local(local_url: str) -> bool:
    return url_ok(local_url)