#!/usr/bin/env python3
"""Install the inert HUX browser bundle into the pinned Hermes WebUI."""

from __future__ import annotations

import os
from pathlib import Path


PINNED_UPSTREAM_COMMIT = "7a94e34a6d639576576baa9131acf6765f6d2b98"
ROOT = Path(os.environ.get("HERMES_WEBUI_PATCH_ROOT", "/opt/hermes-webui"))

STYLES = (
    "hux/foundation.css",
    "hux/runtime/wave_a_activity_memory.css",
    "hux/runtime/autonomy-privacy.css",
    "hux/runtime/wave_b.css",
    "hux/runtime/wave_c_multimodal_onboarding_release.css",
    "hux/bootstrap.css",
)
SCRIPTS = (
    "hux/foundation.js",
    "hux/shell.js",
    "hux/runtime/wave_a_contract.js",
    "hux/runtime/wave_a_activity_memory.js",
    "hux/runtime/autonomy-privacy.js",
    "hux/runtime/wave_b_contract.js",
    "hux/runtime/wave_b_projects_modes.js",
    "hux/runtime/wave_b_artifacts_research.js",
    "hux/runtime/wave_b_runtime.js",
    "hux/runtime/wave_c_multimodal_onboarding_release.js",
    "hux/bootstrap.js",
)


def _patched_index(source: str) -> str:
    if "id=\"hermesHuxBootstrapStyles\"" in source or "static/hux/bootstrap.js" in source:
        raise SystemExit("Hermes HUX browser patch is already installed")
    if source.count("</head>") != 1 or source.count("</body>") != 1:
        raise SystemExit("Hermes HUX index patch context changed")
    if "const S={session:null" not in (ROOT / "static/ui.js").read_text(encoding="utf-8"):
        raise SystemExit("Hermes HUX trusted session context changed")
    links = "\n".join(
        f'<link rel="stylesheet" href="static/{asset}?v=__WEBUI_VERSION__"'
        + (' id="hermesHuxBootstrapStyles">' if asset == "hux/bootstrap.css" else ">")
        for asset in STYLES
    )
    scripts = "\n".join(
        f'<script src="static/{asset}?v=__WEBUI_VERSION__" defer></script>'
        for asset in SCRIPTS
    )
    return source.replace("</head>", f"{links}\n</head>", 1).replace(
        "</body>", f"{scripts}\n</body>", 1
    )


def _patched_worker(source: str) -> str:
    if "'./static/hux/bootstrap.js' + VQ" in source:
        raise SystemExit("Hermes HUX service-worker patch is already installed")
    marker = "  './static/style.css' + VQ,\n"
    if source.count(marker) != 1:
        raise SystemExit("Hermes HUX service-worker patch context changed")
    entries = "".join(f"  './static/{asset}' + VQ,\n" for asset in (*STYLES, *SCRIPTS))
    return source.replace(marker, marker + entries, 1)


def _patched_cancel_stream(source: str) -> str:
    """Make the existing owner-bound cancel report only backend-confirmed cancellation."""
    replacement = "  return Boolean(respOk && respBody && respBody.ok===true && " \
                  "respBody.cancelled===true && respBody.stream_id===streamId);\n"
    if replacement in source:
        raise SystemExit("Hermes HUX cancel-result patch is already installed")
    marker = "  return respOk;\n}\n\nasync function cancelSessionStream"
    if source.count(marker) != 1:
        raise SystemExit("Hermes HUX cancel-result patch context changed")
    return source.replace(marker, replacement + "}\n\nasync function cancelSessionStream", 1)


def _patched_start_context(source: str) -> str:
    """Accept only the context attached to the authoritative chat-start reply."""
    marker = "  const startData = postStartData || {};\n"
    if "HermesHuxBootstrap.mergeTrustedContext" in source:
        raise SystemExit("Hermes HUX chat-start patch is already installed")
    if source.count(marker) != 1:
        raise SystemExit("Hermes HUX chat-start patch context changed")
    replacement = marker + (
        "  if(typeof HermesHuxBootstrap==='object' && S.session){\n"
        "    HermesHuxBootstrap.mergeTrustedContext(S.session, startData);\n"
        "  }\n"
    )
    return source.replace(marker, replacement, 1)


def apply(root: Path | None = None) -> None:
    """Patch the index and offline shell after validating every input."""
    global ROOT
    ROOT = root or ROOT
    index = ROOT / "static/index.html"
    worker = ROOT / "static/sw.js"
    boot = ROOT / "static/boot.js"
    messages = ROOT / "static/messages.js"
    for asset in (*STYLES, *SCRIPTS):
        if not (ROOT / "static" / asset).is_file():
            raise SystemExit(f"Hermes HUX browser asset is missing: {asset}")
    patched_index = _patched_index(index.read_text(encoding="utf-8"))
    patched_worker = _patched_worker(worker.read_text(encoding="utf-8"))
    patched_boot = _patched_cancel_stream(boot.read_text(encoding="utf-8"))
    patched_messages = _patched_start_context(messages.read_text(encoding="utf-8"))
    index.write_text(patched_index, encoding="utf-8")
    worker.write_text(patched_worker, encoding="utf-8")
    boot.write_text(patched_boot, encoding="utf-8")
    messages.write_text(patched_messages, encoding="utf-8")


if __name__ == "__main__":
    apply()