"""Host-side launcher for LibreOffice/OpenOffice UNO table-split worker."""

from __future__ import annotations

import json
import os
import shutil
import socket
import subprocess
import sys
import tempfile
import time
from pathlib import Path

from ..word_fix import FixResult
from .detect import OfficeInstall
from .uno_cli import export_odt_to_docx, soffice_cli_path
from .uno_helpers import file_url_from_path
from .uno_profile import ensure_profile_seeded, profile_dir

_STARTUP_TIMEOUT_S = 90.0
_WORKER_TIMEOUT_S = 600.0
_WORKER_FILES = ("uno_worker.py", "uno_helpers.py")


def _office_program_dir(install: OfficeInstall) -> Path | None:
    """Directory with ``uno.py`` / ``pyuno`` (LibreOffice/OpenOffice ``program``)."""
    for candidate in (install.python_path, install.soffice_path):
        if not candidate:
            continue
        program = Path(candidate).resolve().parent
        if (program / "uno.py").is_file() or (program / "pyuno.pyd").is_file():
            return program
    return None


def _uno_worker_env(worker_dir: Path, install: OfficeInstall) -> tuple[dict[str, str], Path]:
    """Build env + cwd so bundled ``program/python.exe`` can ``import uno``."""
    env = os.environ.copy()
    # System Python's PYTHONHOME/PYTHONPATH confuse LO's embedded interpreter
    # ("Could not find platform independent libraries <prefix>").
    for key in (
        "PYTHONHOME",
        "PYTHONPATH",
        "PYTHONUSERBASE",
        "VIRTUAL_ENV",
        "CONDA_PREFIX",
    ):
        env.pop(key, None)
    program_dir = _office_program_dir(install)
    path_parts = [str(worker_dir)]
    if program_dir is not None:
        path_parts.append(str(program_dir))
    env["PYTHONPATH"] = os.pathsep.join(path_parts)
    env.setdefault("PYTHONIOENCODING", "utf-8")
    if install.soffice_path:
        env["MD2GOST_SOFFICE"] = soffice_cli_path(install.soffice_path)
    cwd = program_dir if program_dir is not None else worker_dir
    return env, cwd


def _office_dir() -> Path:
    return Path(__file__).resolve().parent


def _bundled_office_dir() -> Path | None:
    if not getattr(sys, "frozen", False):
        return None
    meipass = getattr(sys, "_MEIPASS", None)
    if not meipass:
        return None
    bundled = Path(meipass) / "md2gost" / "office"
    if (bundled / "uno_worker.py").is_file():
        return bundled
    return None


def _prepare_worker_dir() -> Path:
    """Return a directory with uno_worker.py (+ helpers) on disk for LO python."""
    bundled = _bundled_office_dir()
    if bundled is not None:
        target = Path(tempfile.mkdtemp(prefix="md2gost-uno-worker-"))
        for name in _WORKER_FILES:
            src = bundled / name
            if not src.is_file():
                raise FileNotFoundError(f"UNO worker bundle incomplete: missing {src}")
            shutil.copy2(src, target / name)
        return target

    dev_dir = _office_dir()
    worker = dev_dir / "uno_worker.py"
    if not worker.is_file():
        raise FileNotFoundError(f"UNO worker не найден: {worker}")
    return dev_dir


def _free_port() -> int:
    with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as sock:
        sock.bind(("127.0.0.1", 0))
        return int(sock.getsockname()[1])


def _wait_for_port(port: int, _proc: subprocess.Popen[str], timeout_s: float) -> bool:
    """Wait until UNO port accepts connections.

    On Windows ``soffice.exe`` is a launcher that exits after spawning
    ``soffice.bin``; do not treat wrapper exit as failure.
    """
    deadline = time.monotonic() + timeout_s
    while time.monotonic() < deadline:
        try:
            with socket.create_connection(("127.0.0.1", port), timeout=0.25):
                return True
        except OSError:
            time.sleep(0.15)
    return False


def _parse_worker_output(stdout: str) -> FixResult | None:
    for line in reversed(stdout.splitlines()):
        line = line.strip()
        if not line.startswith("{"):
            continue
        try:
            payload = json.loads(line)
        except json.JSONDecodeError:
            continue
        return FixResult(
            ok=bool(payload.get("ok")),
            splits=int(payload.get("splits", 0)),
            skipped=int(payload.get("skipped", 0)),
            message=str(payload.get("message", "")),
            details=list(payload.get("details", [])),
            odt_temp=payload.get("odt_temp") or None,
        )
    return None


def _export_odt_temp_to_docx(
    install: OfficeInstall, odt_temp: str, docx_path: str
) -> None:
    """Convert worker-side ODT (ASCII temp) back to target DOCX on the host (Py3)."""
    time.sleep(0.5)
    bridge_dir = Path(tempfile.mkdtemp(prefix="md2gost-oo-export-"))
    local_odt = bridge_dir / "export.odt"
    try:
        shutil.copy2(odt_temp, local_odt)
        engines = [install]
        if install.engine == "openoffice":
            from .detect import detect_office_install

            libre = detect_office_install("libre")
            if libre is not None and libre.soffice_path:
                engines.append(libre)
        last_exc: Exception | None = None
        out_docx: Path | None = None
        for eng in engines:
            try:
                out_docx = export_odt_to_docx(
                    eng.soffice_path or "",
                    engine=eng.engine,
                    odt_path=str(local_odt),
                    out_dir=str(bridge_dir),
                )
                break
            except Exception as exc:
                last_exc = exc
        if out_docx is None:
            raise RuntimeError(str(last_exc or "ODT export failed"))
        shutil.copy2(out_docx, docx_path)
    finally:
        shutil.rmtree(bridge_dir, ignore_errors=True)
        try:
            os.remove(odt_temp)
        except OSError:
            pass


def _soffice_server_cmd(soffice_path: str, profile_root: Path, port: int) -> list[str]:
    ensure_profile_seeded(profile_root)
    return [
        soffice_cli_path(soffice_path),
        f"-env:UserInstallation={file_url_from_path(str(profile_root))}",
        "-headless",
        "-invisible",
        "-nologo",
        "-norestore",
        "-nodefault",
        "-nofirststartwizard",
        "-nolockcheck",
        f"-accept=socket,host=127.0.0.1,port={port};urp;",
    ]


def _run_uno_worker(
    *,
    install: OfficeInstall,
    worker_dir: Path,
    worker_path: str,
    tables: bool,
    listings: bool,
    repeat_header: bool,
) -> FixResult:
    soffice = install.soffice_path
    python_exe = install.python_path
    if not soffice or not python_exe:
        return FixResult(
            False,
            message=f"Пост-разрыв ({install.label}): не задан путь к soffice/python.",
        )

    port = _free_port()
    user_profile = profile_dir(install.engine)
    proc: subprocess.Popen[str] | None = None
    try:
        proc = subprocess.Popen(
            _soffice_server_cmd(soffice, user_profile, port),
            stdout=subprocess.DEVNULL,
            stderr=subprocess.DEVNULL,
            creationflags=getattr(subprocess, "CREATE_NO_WINDOW", 0) if sys.platform == "win32" else 0,
        )
        if not _wait_for_port(port, proc, _STARTUP_TIMEOUT_S):
            hint = ""
            if install.engine == "openoffice":
                hint = (
                    " Закройте все окна OpenOffice (в т.ч. «Центр запуска») "
                    "и повторите."
                )
            return FixResult(
                False,
                message=(
                    f"Пост-разрыв ({install.label}): не удалось запустить soffice "
                    f"на порту {port}.{hint}"
                ),
            )

        env, worker_cwd = _uno_worker_env(worker_dir, install)

        worker_cmd = [
            python_exe,
            str(worker_dir / "uno_worker.py"),
            "--port",
            str(port),
            "--path",
            worker_path,
            "--engine",
            install.engine,
            "--tables",
            "1" if tables else "0",
            "--listings",
            "1" if listings else "0",
            "--repeat-header",
            "1" if repeat_header else "0",
        ]
        completed = subprocess.run(
            worker_cmd,
            capture_output=True,
            timeout=_WORKER_TIMEOUT_S,
            env=env,
            cwd=str(worker_cwd),
            creationflags=getattr(subprocess, "CREATE_NO_WINDOW", 0) if sys.platform == "win32" else 0,
        )
        stdout = (completed.stdout or b"").decode("utf-8", errors="replace")
        stderr = (completed.stderr or b"").decode("utf-8", errors="replace")
        parsed = _parse_worker_output(stdout)
        if parsed is not None:
            if parsed.ok and parsed.odt_temp:
                try:
                    _export_odt_temp_to_docx(install, parsed.odt_temp, worker_path)
                    parsed.details.append("bridge: ODT→DOCX (host)")
                    parsed.odt_temp = None
                except Exception as exc:
                    if parsed.splits > 0:
                        msg = (
                            f"Пост-разрыв ({install.label}): разрезов {parsed.splits}, "
                            f"но экспорт DOCX не удался: {exc}"
                        )
                    else:
                        msg = (
                            f"Пост-разрыв ({install.label}): "
                            f"экспорт DOCX не удался: {exc}"
                        )
                    return FixResult(
                        False,
                        splits=parsed.splits,
                        skipped=parsed.skipped,
                        message=msg,
                        details=parsed.details,
                    )
            return parsed

        tail = (stderr or stdout or "").strip()
        if len(tail) > 400:
            tail = tail[-400:]
        return FixResult(
            False,
            message=(
                f"Пост-разрыв ({install.label}) не удался "
                f"(код {completed.returncode})."
                + (f" {tail}" if tail else "")
            ),
        )
    except subprocess.TimeoutExpired:
        return FixResult(
            False,
            message=f"Пост-разрыв ({install.label}): превышено время ожидания UNO worker.",
        )
    finally:
        if proc is not None:
            try:
                proc.terminate()
                proc.wait(timeout=5)
            except Exception:
                try:
                    proc.kill()
                except Exception:
                    pass


def fix_continuations_uno(
    path: str,
    *,
    install: OfficeInstall,
    tables: bool = True,
    listings: bool = True,
    repeat_header: bool = False,
) -> FixResult:
    """Run UNO worker via LibreOffice/OpenOffice bundled Python."""
    abs_path = os.path.abspath(path)
    if not os.path.isfile(abs_path):
        return FixResult(False, message=f"Файл не найден: {abs_path}")

    worker_dir: Path | None = None
    try:
        worker_dir = _prepare_worker_dir()
    except FileNotFoundError as exc:
        return FixResult(False, message=str(exc))

    try:
        return _run_uno_worker(
            install=install,
            worker_dir=worker_dir,
            worker_path=abs_path,
            tables=tables,
            listings=listings,
            repeat_header=repeat_header,
        )
    finally:
        if worker_dir is not None and _bundled_office_dir() is not None:
            shutil.rmtree(worker_dir, ignore_errors=True)