"""Read-only KB proposal review routes for Argus.

This surface is the operator-visible bridge between Leo's Telegram KB reasoning
and the narrow apply worker. It intentionally performs no approve/reject/apply
mutation; it only renders the same packets produced by
``scripts/kb_proposal_review_packet.py``.
"""

from __future__ import annotations

import argparse
import logging
import os
import sys
from collections import Counter
from datetime import datetime, timezone
from html import escape
from pathlib import Path
from typing import Any
from urllib.parse import urlencode

from aiohttp import web
from shared_ui import render_page

ROOT = Path(__file__).resolve().parent.parent
SCRIPTS_DIR = ROOT / "scripts"
if str(SCRIPTS_DIR) not in sys.path:
    sys.path.insert(0, str(SCRIPTS_DIR))

import kb_proposal_review_packet as proposal_review  # noqa: E402

logger = logging.getLogger("argus.kb_proposals")

KB_PROPOSAL_PUBLIC_PATHS = frozenset({"/kb-proposals", "/api/kb-proposals"})
KB_PROPOSAL_LOADER_KEY = web.AppKey("kb_proposal_loader", object)

DEFAULT_LIMIT = 20
MAX_LIMIT = 100


def _query_limit(value: str | None) -> int:
    if not value:
        return DEFAULT_LIMIT
    try:
        limit = int(value)
    except ValueError:
        return DEFAULT_LIMIT
    return max(1, min(limit, MAX_LIMIT))


def _query_filters(request: web.Request) -> dict[str, Any]:
    status = request.query.get("status", "approved").strip() or "approved"
    proposal_id = (request.query.get("proposal_id") or "").strip()
    if proposal_id:
        status = ""
    return {
        "status": status,
        "proposal_id": proposal_id,
        "limit": _query_limit(request.query.get("limit")),
    }


def _db_args(filters: dict[str, Any]) -> argparse.Namespace:
    return argparse.Namespace(
        proposal_id=filters["proposal_id"] or None,
        status=filters["status"] or None,
        limit=filters["limit"],
        secrets_file=os.environ.get(
            "KB_PROPOSAL_REVIEW_SECRETS_FILE",
            os.environ.get("KB_APPLY_SECRETS_FILE", proposal_review.ap.DEFAULT_SECRETS_FILE),
        ),
        container=os.environ.get("KB_PROPOSAL_REVIEW_CONTAINER", proposal_review.ap.DEFAULT_CONTAINER),
        db=os.environ.get("KB_PROPOSAL_REVIEW_DB", proposal_review.ap.DEFAULT_DB),
        host=os.environ.get("KB_PROPOSAL_REVIEW_HOST", proposal_review.ap.DEFAULT_HOST),
        role=os.environ.get("KB_PROPOSAL_REVIEW_ROLE", proposal_review.ap.DEFAULT_ROLE),
    )


def _load_packets(request: web.Request, filters: dict[str, Any]) -> list[dict[str, Any]]:
    loader = request.app.get(KB_PROPOSAL_LOADER_KEY)
    proposals = loader(_db_args(filters)) if loader else proposal_review.load_from_db(_db_args(filters))
    return [proposal_review.classify_proposal(proposal) for proposal in proposals]


def _counts(packets: list[dict[str, Any]], key: str) -> dict[str, int]:
    return dict(Counter(str(packet.get(key) or "unknown") for packet in packets))


def build_kb_proposal_response(packets: list[dict[str, Any]], filters: dict[str, Any]) -> dict[str, Any]:
    return {
        "generated_at": datetime.now(timezone.utc).isoformat(),
        "filters": filters,
        "total": len(packets),
        "status_counts": _counts(packets, "status"),
        "review_state_counts": _counts(packets, "review_state"),
        "worker_applyable_count": sum(1 for packet in packets if packet.get("worker_applyable")),
        "packets": packets,
        "read_only": True,
    }


def _badge_class(value: str) -> str:
    if value in {"applied", "approved_applyable"}:
        return "badge-green"
    if value in {"approved", "approved_needs_apply_payload", "needs_human_review", "pending_review"}:
        return "badge-yellow"
    if value in {"unsupported_by_apply_worker", "not_ready"}:
        return "badge-red"
    return "badge-blue"


def _badge(value: Any) -> str:
    text = escape(str(value or "unknown"))
    return f'<span class="badge {_badge_class(str(value or ""))}">{text}</span>'


def _join_values(values: list[Any]) -> str:
    if not values:
        return '<span class="muted">none</span>'
    return ", ".join(escape(str(value)) for value in values)


def _status_link(label: str, status: str, filters: dict[str, Any]) -> str:
    query = urlencode({"status": status, "limit": filters["limit"]})
    return f'<a class="filter-link" href="/kb-proposals?{query}">{escape(label)}</a>'


def _packet_card(packet: dict[str, Any]) -> str:
    auth = packet.get("identity_and_authorization") or {}
    summary = packet.get("payload_summary") or {}
    applyability = packet.get("applyability") or {}
    proposal_id = escape(str(packet.get("proposal_id") or "unknown"))
    proposal_kind = escape(str(summary.get("proposal_kind") or "unknown"))
    next_action = escape(str(packet.get("next_admin_action") or "No next action recorded."))
    source_ref = escape(str(auth.get("source_ref") or "unknown"))
    channel = escape(str(auth.get("channel") or "unknown"))
    reviewed_by = escape(str(auth.get("reviewed_by_handle") or "unreviewed"))

    rows = [
        ("Status", _badge(packet.get("status"))),
        ("Review state", _badge(packet.get("review_state"))),
        ("Worker applyable", "yes" if packet.get("worker_applyable") else "no"),
        ("Has strict apply payload", "yes" if packet.get("has_apply_payload") else "no"),
        ("Proposal kind", proposal_kind),
        ("Reviewed by", reviewed_by),
        ("Channel", channel),
        ("Source ref", source_ref),
        ("Old claim id", escape(str(summary.get("old_claim_id") or "unknown"))),
        ("Claim candidates", str(summary.get("claim_candidate_count", 0))),
        ("Source candidates", str(summary.get("source_candidate_count", 0))),
        ("Supersession edges", str(summary.get("supersession_edge_count", 0))),
        ("Missing contract", _join_values(applyability.get("missing_contract") or [])),
    ]
    details = "\n".join(
        f"<tr><th>{escape(label)}</th><td>{value}</td></tr>" for label, value in rows
    )
    return f"""
<article class="proposal-card">
  <div class="proposal-card-header">
    <h2>{proposal_id}</h2>
  </div>
  <table class="proposal-detail">
    <tbody>{details}</tbody>
  </table>
  <div class="next-action">
    <div class="label">Next admin action</div>
    <p>{next_action}</p>
  </div>
</article>"""


def render_kb_proposals_page(data: dict[str, Any]) -> str:
    filters = data["filters"]
    packets = data["packets"]
    generated_at = escape(str(data["generated_at"]))
    cards = "\n".join(_packet_card(packet) for packet in packets)
    if not cards:
        cards = '<div class="alert-banner alert-info">No proposals matched this filter.</div>'

    filter_html = " ".join(
        [
            _status_link("Approved", "approved", filters),
            _status_link("Pending review", "pending_review", filters),
            _status_link("Applied", "applied", filters),
        ]
    )
    body = f"""
<div class="alert-banner alert-info">
  Read-only review surface. It shows proposal intent, applyability, missing contracts,
  and the next admin action; it does not approve, reject, or apply proposals.
</div>
<div class="grid">
  <div class="card"><div class="label">Matching proposals</div><div class="value">{data["total"]}</div></div>
  <div class="card"><div class="label">Worker applyable</div><div class="value">{data["worker_applyable_count"]}</div></div>
  <div class="card"><div class="label">Current status filter</div><div class="value small-value">{escape(filters.get("status") or "by id")}</div></div>
</div>
<div class="section">
  <div class="section-title">Filters</div>
  <div class="filters">{filter_html}</div>
</div>
<div class="section">
  <div class="section-title">Proposal Review Packets</div>
  <div class="proposal-list">{cards}</div>
</div>"""
    extra_css = """
  .small-value { font-size: 16px !important; overflow-wrap: anywhere; }
  .filters { display: flex; flex-wrap: wrap; gap: 8px; }
  .filter-link { color: #58a6ff; background: #161b22; border: 1px solid #30363d;
                 border-radius: 6px; padding: 6px 10px; text-decoration: none; font-size: 13px; }
  .filter-link:hover { background: #21262d; }
  .proposal-list { display: grid; gap: 16px; }
  .proposal-card { background: #161b22; border: 1px solid #30363d; border-radius: 8px; padding: 16px; }
  .proposal-card-header { display: flex; justify-content: space-between; gap: 12px; align-items: start; }
  .proposal-card h2 { color: #c9d1d9; font-size: 15px; overflow-wrap: anywhere; }
  .proposal-detail { margin-top: 12px; }
  .proposal-detail th { width: 210px; vertical-align: top; }
  .proposal-detail td { overflow-wrap: anywhere; }
  .next-action { margin-top: 14px; padding: 12px; border: 1px solid #30363d; border-radius: 6px; background: #0d1117; }
  .next-action .label { color: #8b949e; font-size: 11px; text-transform: uppercase; margin-bottom: 6px; }
  .next-action p { color: #c9d1d9; line-height: 1.4; }
  .muted { color: #8b949e; }
"""
    return render_page(
        "KB Proposals",
        "Review Leo KB proposal packets before any apply step",
        "/kb-proposals",
        body,
        extra_css=extra_css,
        timestamp=generated_at,
    )


async def handle_api_kb_proposals(request: web.Request) -> web.Response:
    filters = _query_filters(request)
    try:
        packets = _load_packets(request, filters)
    except BaseException as exc:
        logger.exception("KB proposal packet load failed")
        return web.json_response({"error": "kb_proposal_load_failed", "detail": str(exc)}, status=500)
    return web.json_response(build_kb_proposal_response(packets, filters))


async def handle_kb_proposals_page(request: web.Request) -> web.Response:
    filters = _query_filters(request)
    try:
        packets = _load_packets(request, filters)
    except BaseException as exc:
        logger.exception("KB proposal packet page failed")
        return web.Response(
            text=render_page(
                "KB Proposals",
                "Review Leo KB proposal packets before any apply step",
                "/kb-proposals",
                f'<div class="alert-banner alert-critical">Failed to load KB proposals: {escape(str(exc))}</div>',
            ),
            content_type="text/html",
            status=500,
        )
    data = build_kb_proposal_response(packets, filters)
    return web.Response(text=render_kb_proposals_page(data), content_type="text/html")


def register_kb_proposal_routes(app: web.Application) -> None:
    app.router.add_get("/api/kb-proposals", handle_api_kb_proposals)
    app.router.add_get("/kb-proposals", handle_kb_proposals_page)