"""WinRM connectivity test for Windows hosts using domain admin credentials."""

from __future__ import annotations

import re
import socket
from dataclasses import dataclass
from pathlib import Path

from app.config import get_settings
from app.models import Host
from app.services.agent_git_release import _cache_dir, clone_or_update_repo
from app.services.rdp_bundle_delivery import build_rdp_bundle_zip, register_rdp_bundle_zip

_CLIXML_PROGRESS_NOISE = frozenset(
    {
        "Preparing modules for first use.",
        "Preparing modules fo",
    }
)
_CLIXML_MARKER = "#< CLIXML"
_CYRILLIC_RE = re.compile(r"[\u0400-\u04FF]")
RDP_REMOTE_STAGING = r"C:\ProgramData\RDP-login-monitor\_sac_staging"
RDP_BUNDLE_FILES = (
    "Login_Monitor.ps1",
    "Sac-Client.ps1",
    "RdpMonitor-TaskQuery.ps1",
    "version.txt",
    "Deploy-LoginMonitor.ps1",
    "Restart-RdpLoginMonitor.ps1",
    "login_monitor.settings.example.ps1",
)
RDP_BUNDLE_REQUIRED = frozenset(
    {
        "Login_Monitor.ps1",
        "Sac-Client.ps1",
        "version.txt",
        "Deploy-LoginMonitor.ps1",
    }
)


class WinAdminNotConfiguredError(Exception):
    pass


class HostNotWindowsError(Exception):
    pass


class HostTargetMissingError(Exception):
    pass


@dataclass(frozen=True)
class WinRmTestResult:
    ok: bool
    message: str
    target: str
    hostname: str | None = None


@dataclass(frozen=True)
class WinRmCmdResult:
    ok: bool
    message: str
    target: str
    stdout: str = ""
    stderr: str = ""
    exit_code: int | None = None


def _winrm_session(
    target: str,
    user: str,
    password: str,
    *,
    timeout_sec: int = 15,
):
    from app.services.win_admin_settings import normalize_win_admin_user

    user = normalize_win_admin_user(user.strip())
    target = target.strip()
    if not target or not user or not password:
        raise WinAdminNotConfiguredError("Windows admin credentials or target missing")

    try:
        import winrm
    except ImportError as exc:
        raise RuntimeError("pywinrm is not installed on SAC server") from exc

    operation_timeout_sec = max(5, timeout_sec)
    read_timeout_sec = operation_timeout_sec + 15
    endpoint = f"http://{target}:5985/wsman"
    session = winrm.Session(
        endpoint,
        auth=(user, password),
        transport="ntlm",
        read_timeout_sec=read_timeout_sec,
        operation_timeout_sec=operation_timeout_sec,
    )
    return session, winrm


def _clixml_to_plain(text: str) -> str:
    """Turn WinRM/PowerShell CLIXML blobs into readable text; drop progress noise."""
    raw = text or ""
    if _CLIXML_MARKER not in raw:
        return raw.strip()

    messages = re.findall(r'<S N="Message">([^<]*)</S>', raw, flags=re.IGNORECASE)
    messages = [
        msg.strip()
        for msg in messages
        if msg.strip() and msg.strip() not in _CLIXML_PROGRESS_NOISE
    ]
    to_strings = re.findall(r"<ToString>([^<]*)</ToString>", raw, flags=re.IGNORECASE)
    to_strings = [
        text.strip()
        for text in to_strings
        if text.strip() and "Preparing modules" not in text
    ]
    parts = [*messages, *to_strings]
    if parts:
        return "\n".join(parts)

    without = re.sub(r"#< CLIXML.*", "", raw, flags=re.DOTALL).strip()
    return without


def _decode_text_score(text: str) -> int:
    cyrillic = len(_CYRILLIC_RE.findall(text))
    suspicious = len(re.findall(r"\?{3,}", text))
    return cyrillic * 5 - text.count("\ufffd") * 20 - suspicious * 15 - max(0, text.count("?") - cyrillic) * 2


def _decode_winrm_bytes(data: bytes) -> str:
    if not data:
        return ""
    for encoding in ("utf-8-sig", "utf-8"):
        try:
            text = data.decode(encoding)
        except UnicodeDecodeError:
            break
        score = _decode_text_score(text)
        if text.isascii() or score > 0:
            return text
    best_score = -10_000
    best_text = ""
    for encoding in ("cp866", "cp1251"):
        try:
            text = data.decode(encoding)
        except UnicodeDecodeError:
            continue
        score = _decode_text_score(text)
        if score > best_score:
            best_score = score
            best_text = text
    if best_text:
        return best_text
    return data.decode("utf-8", errors="replace")


def _winrm_failure_detail(stdout: str, stderr: str, exit_code: int) -> str:
    stdout_plain = _clixml_to_plain(stdout)
    stderr_plain = _clixml_to_plain(stderr)

    for candidate in (stderr_plain, stdout_plain):
        if candidate and _CLIXML_MARKER not in candidate:
            line = candidate.strip().splitlines()[0][:2000]
            if line.startswith("ERROR:"):
                return line[6:].strip() or line
            return line

    if stdout_plain:
        return stdout_plain[:2000]
    if stderr_plain:
        return stderr_plain[:2000]
    return (
        f"PowerShell exit code {exit_code} "
        "(CLIXML без текста ошибки — проверьте Deploy-LoginMonitor.ps1 на ПК)"
    )


def _sanitize_winrm_streams(stdout: str, stderr: str) -> tuple[str, str]:
    return _clixml_to_plain(stdout), _clixml_to_plain(stderr)


def _finalize_winrm_run(
    *,
    target: str,
    stdout: str,
    stderr: str,
    exit_code: int,
) -> WinRmCmdResult:
    ok = exit_code == 0
    if ok:
        message = f"WinRM OK ({target}), exit 0"
        if stdout.strip():
            message = f"{message}\n{stdout.strip().splitlines()[0][:200]}"
    else:
        detail = _winrm_failure_detail(stdout, stderr, exit_code)
        message = f"WinRM command failed ({target}): {detail}"
    return WinRmCmdResult(
        ok=ok,
        message=message,
        target=target,
        stdout=stdout,
        stderr=stderr,
        exit_code=exit_code,
    )


def run_winrm_ps(
    *,
    target: str,
    user: str,
    password: str,
    script: str,
    timeout_sec: int = 30,
) -> WinRmCmdResult:
    target = target.strip()
    try:
        session, winrm = _winrm_session(target, user, password, timeout_sec=timeout_sec)
        result = session.run_ps(script)
    except winrm.exceptions.WinRMTransportError as exc:
        detail = str(exc)
        hint = ""
        if "credentials were rejected" in detail.lower():
            hint = " Проверьте логин (B26\\user), пароль и WinRM на ПК."
        return WinRmCmdResult(
            ok=False,
            message=f"WinRM transport error ({target}): {detail}{hint}",
            target=target,
        )
    except (socket.timeout, TimeoutError):
        return WinRmCmdResult(
            ok=False,
            message=f"WinRM timeout ({timeout_sec}s) to {target}:5985",
            target=target,
        )
    except WinAdminNotConfiguredError as exc:
        return WinRmCmdResult(ok=False, message=str(exc), target=target)
    except RuntimeError as exc:
        return WinRmCmdResult(ok=False, message=str(exc), target=target)
    except Exception as exc:
        return WinRmCmdResult(ok=False, message=f"WinRM error ({target}): {exc}", target=target)

    stdout = _decode_winrm_bytes(result.std_out or b"")
    stderr = _decode_winrm_bytes(result.std_err or b"")
    exit_code = int(result.status_code)
    stdout, stderr = _sanitize_winrm_streams(stdout, stderr)
    return _finalize_winrm_run(
        target=target,
        stdout=stdout,
        stderr=stderr,
        exit_code=exit_code,
    )


def run_winrm_cmd(
    *,
    target: str,
    user: str,
    password: str,
    remote_cmd: str,
    timeout_sec: int = 30,
) -> WinRmCmdResult:
    target = target.strip()
    try:
        session, winrm = _winrm_session(target, user, password, timeout_sec=timeout_sec)
        result = session.run_cmd(remote_cmd)
    except winrm.exceptions.WinRMTransportError as exc:
        detail = str(exc)
        hint = ""
        if "credentials were rejected" in detail.lower():
            hint = " Проверьте логин (B26\\user), пароль и WinRM на ПК."
        return WinRmCmdResult(
            ok=False,
            message=f"WinRM transport error ({target}): {detail}{hint}",
            target=target,
        )
    except (socket.timeout, TimeoutError):
        return WinRmCmdResult(
            ok=False,
            message=f"WinRM timeout ({timeout_sec}s) to {target}:5985",
            target=target,
        )
    except WinAdminNotConfiguredError as exc:
        return WinRmCmdResult(ok=False, message=str(exc), target=target)
    except RuntimeError as exc:
        return WinRmCmdResult(ok=False, message=str(exc), target=target)
    except Exception as exc:
        return WinRmCmdResult(ok=False, message=f"WinRM error ({target}): {exc}", target=target)

    stdout = _decode_winrm_bytes(result.std_out or b"")
    stderr = _decode_winrm_bytes(result.std_err or b"")
    exit_code = int(result.status_code)
    stdout, stderr = _sanitize_winrm_streams(stdout, stderr)
    return _finalize_winrm_run(
        target=target,
        stdout=stdout,
        stderr=stderr,
        exit_code=exit_code,
    )


def run_winrm_qwinsta(*, target: str, user: str, password: str) -> WinRmCmdResult:
    return run_winrm_cmd(target=target, user=user, password=password, remote_cmd="qwinsta", timeout_sec=45)


def run_winrm_logoff(*, target: str, user: str, password: str, session_id: int) -> WinRmCmdResult:
    if session_id < 0:
        return WinRmCmdResult(ok=False, message="Invalid session_id", target=target)
    return run_winrm_cmd(
        target=target,
        user=user,
        password=password,
        remote_cmd=f"logoff {session_id} /v",
        timeout_sec=45,
    )


def _powershell_script_prelude() -> str:
    return (
        "$ProgressPreference = 'SilentlyContinue'\n"
        "$InformationPreference = 'SilentlyContinue'\n"
        "$utf8NoBom = New-Object System.Text.UTF8Encoding $false\n"
        "[Console]::OutputEncoding = $utf8NoBom\n"
        "$OutputEncoding = $utf8NoBom\n"
    )


def _powershell_literal_path(path: str) -> str:
    return path.replace("'", "''")


def _wrap_powershell_body(body: str) -> str:
    indented = "\n".join(f"  {line}" if line else "" for line in body.splitlines())
    return (
        _powershell_script_prelude()
        + "try {\n"
        + indented
        + "\n} catch {\n"
        + "  Write-Output ('ERROR: ' + $_.Exception.Message)\n"
        + "  exit 1\n"
        + "}\n"
    )


def _custom_deploy_body(script_path: str) -> str:
    literal = _powershell_literal_path(script_path.strip())
    return (
        f"$p = '{literal}'\n"
        "if (-not (Test-Path -LiteralPath $p)) { throw \"Deploy script not found: $p\" }\n"
        "Write-Output \"Running: $p\"\n"
        "& $p"
    )


def _prepare_staging_body(staging_path: str) -> str:
    literal = _powershell_literal_path(staging_path)
    return (
        f"$staging = '{literal}'\n"
        "if (Test-Path -LiteralPath $staging) { Remove-Item -LiteralPath $staging -Recurse -Force }\n"
        "New-Item -ItemType Directory -Path $staging -Force | Out-Null\n"
        "Write-Output \"Staging ready: $staging\"\n"
    )


def _deploy_from_staging_body(staging_path: str) -> str:
    literal = _powershell_literal_path(staging_path)
    return (
        f"$staging = '{literal}'\n"
        "$deploy = Join-Path $staging 'Deploy-LoginMonitor.ps1'\n"
        "if (-not (Test-Path -LiteralPath $deploy)) { throw \"Deploy-LoginMonitor.ps1 missing in staging\" }\n"
        "$logPath = Join-Path $env:ProgramData 'RDP-login-monitor\\Logs\\deploy.log'\n"
        "Write-Output \"Running: $deploy -SourceShareRoot $staging\"\n"
        "powershell.exe -NoProfile -ExecutionPolicy Bypass -File $deploy -SourceShareRoot $staging\n"
        "if (Test-Path -LiteralPath $logPath) {\n"
        "  Write-Output ''\n"
        "  Write-Output '--- deploy.log ---'\n"
        "  Get-Content -LiteralPath $logPath -Encoding UTF8 | Select-Object -Last 60\n"
        "}\n"
    )


def _bundle_download_url(token: str) -> str:
    base = get_settings().sac_public_url.rstrip("/")
    return f"{base}/api/v1/agent/rdp-bundle/{token}"


def _download_bundle_body(staging_path: str, bundle_url: str) -> str:
    staging = _powershell_literal_path(staging_path)
    url = _powershell_literal_path(bundle_url)
    return (
        f"$staging = '{staging}'\n"
        f"$url = '{url}'\n"
        "$zip = Join-Path $staging 'sac-rdp-bundle.zip'\n"
        "[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12\n"
        "Write-Output \"Downloading bundle: $url\"\n"
        "Invoke-WebRequest -Uri $url -OutFile $zip -UseBasicParsing\n"
        "Add-Type -AssemblyName System.IO.Compression.FileSystem\n"
        "[System.IO.Compression.ZipFile]::ExtractToDirectory($zip, $staging)\n"
        "Remove-Item -LiteralPath $zip -Force\n"
        "Write-Output \"Bundle extracted to $staging\"\n"
    )


def _fetch_rdp_bundle_dir(repo_url: str, git_branch: str) -> Path:
    settings = get_settings()
    return clone_or_update_repo(
        repo_url,
        git_branch,
        _cache_dir(),
        token=(settings.sac_agent_git_token or "").strip(),
    )


def run_winrm_rdp_monitor_update(
    *,
    target: str,
    user: str,
    password: str,
    script_path: str = "",
    repo_url: str = "",
    git_branch: str = "main",
) -> WinRmCmdResult:
    target = target.strip()
    if script_path.strip():
        return run_winrm_ps(
            target=target,
            user=user,
            password=password,
            script=_wrap_powershell_body(_custom_deploy_body(script_path)),
            timeout_sec=900,
        )

    effective_repo = (
        repo_url or "https://git.kalinamall.ru/PapaTramp/RDP-login-monitor.git"
    ).strip()
    effective_branch = (git_branch or "main").strip() or "main"
    if not effective_repo:
        return WinRmCmdResult(
            ok=False,
            message="rdp_git_repo_url is not configured in SAC",
            target=target,
        )

    try:
        repo_dir = _fetch_rdp_bundle_dir(effective_repo, effective_branch)
    except Exception as exc:
        return WinRmCmdResult(
            ok=False,
            message=f"SAC failed to fetch RDP bundle from git: {exc}",
            target=target,
        )

    missing = [name for name in RDP_BUNDLE_REQUIRED if not (repo_dir / name).is_file()]
    if missing:
        return WinRmCmdResult(
            ok=False,
            message=f"RDP bundle incomplete on SAC: missing {', '.join(missing)}",
            target=target,
        )

    staging = RDP_REMOTE_STAGING
    zip_bytes = build_rdp_bundle_zip(repo_dir, RDP_BUNDLE_FILES)
    if not zip_bytes:
        return WinRmCmdResult(
            ok=False,
            message="RDP bundle zip is empty on SAC",
            target=target,
        )
    bundle_token = register_rdp_bundle_zip(zip_bytes)
    bundle_url = _bundle_download_url(bundle_token)

    prep = run_winrm_ps(
        target=target,
        user=user,
        password=password,
        script=_wrap_powershell_body(_prepare_staging_body(staging)),
        timeout_sec=120,
    )
    if not prep.ok:
        return prep

    download = run_winrm_ps(
        target=target,
        user=user,
        password=password,
        script=_wrap_powershell_body(_download_bundle_body(staging, bundle_url)),
        timeout_sec=300,
    )
    if not download.ok:
        return WinRmCmdResult(
            ok=False,
            message=(
                f"Failed to download RDP bundle on client: {download.message} "
                f"(URL: {bundle_url})"
            ),
            target=target,
            stdout="\n\n".join(part.strip() for part in [prep.stdout, download.stdout] if part.strip()),
            stderr=download.stderr,
            exit_code=download.exit_code,
        )

    deploy = run_winrm_ps(
        target=target,
        user=user,
        password=password,
        script=_wrap_powershell_body(_deploy_from_staging_body(staging)),
        timeout_sec=900,
    )
    header = f"SAC served bundle from git; client downloaded to {staging}"
    stdout = "\n\n".join(
        part.strip()
        for part in [header, prep.stdout, download.stdout, deploy.stdout]
        if part.strip()
    )
    return WinRmCmdResult(
        ok=deploy.ok,
        message=deploy.message,
        target=target,
        stdout=stdout,
        stderr=deploy.stderr,
        exit_code=deploy.exit_code,
    )


def run_winrm_on_host_targets(
    host: Host,
    *,
    user: str,
    password: str,
    action,
) -> tuple[WinRmCmdResult | None, list[str]]:
    """Try WinRM targets in hostname-first order; action(target) -> WinRmCmdResult."""
    attempts: list[str] = []
    last: WinRmCmdResult | None = None
    for target in iter_winrm_targets(host):
        result = action(target=target)
        last = result
        attempts.append(f"{target}={'OK' if result.ok else 'fail'}")
        if result.ok:
            return result, attempts
    return last, attempts


def resolve_windows_host_target(host: Host) -> str:
    targets = iter_winrm_targets(host)
    if not targets:
        raise HostTargetMissingError("Host has no hostname or IPv4 for WinRM test")
    return targets[0]


def _netbios_name_variants(name: str | None) -> list[str]:
    """Короткое имя ПК (NetBIOS), как Enter-PSSession -ComputerName Andrisonova-PC."""
    text = (name or "").strip()
    if not text:
        return []
    short = text.split(".")[0].split("\\")[0].strip()
    if not short:
        return []
    if short.casefold() == text.casefold():
        return [short]
    return [short, text]


def _looks_like_computer_name(value: str) -> bool:
    text = value.strip()
    if not text or " " in text:
        return False
    return len(text) <= 63


def iter_winrm_targets(host: Host) -> list[str]:
    """WinRM + NTLM: сначала имя хоста (как Enter-PSSession -ComputerName), IP — последним."""
    if not is_windows_host(host):
        raise HostNotWindowsError("Host is not Windows")

    seen: set[str] = set()
    ordered: list[str] = []

    def add(value: str | None) -> None:
        text = (value or "").strip()
        if not text or text.casefold() in seen:
            return
        seen.add(text.casefold())
        ordered.append(text)

    for variant in _netbios_name_variants(host.hostname):
        add(variant)

    inventory = host.inventory if isinstance(host.inventory, dict) else {}
    computer_name = inventory.get("computer_name")
    if isinstance(computer_name, str):
        for variant in _netbios_name_variants(computer_name):
            add(variant)

    if host.display_name and _looks_like_computer_name(host.display_name):
        for variant in _netbios_name_variants(host.display_name):
            add(variant)

    add(host.ipv4)
    return ordered


def is_windows_host(host: Host) -> bool:
    if (host.os_family or "").strip().lower() == "windows":
        return True
    return (host.product or "").strip() == "rdp-login-monitor"


def test_winrm_connection(
    *,
    target: str,
    user: str,
    password: str,
    timeout_sec: int = 15,
) -> WinRmTestResult:
    result = run_winrm_cmd(
        target=target,
        user=user,
        password=password,
        remote_cmd="hostname",
        timeout_sec=timeout_sec,
    )
    if result.ok and result.stdout.strip():
        host = result.stdout.strip().splitlines()[0]
        return WinRmTestResult(
            ok=True,
            message=f"WinRM OK, hostname={host}",
            target=result.target,
            hostname=host,
        )
    return WinRmTestResult(
        ok=result.ok,
        message=result.message,
        target=result.target,
        hostname=None,
    )