"""IRM: инциденты — учёт сбоев, связь с сырым ingress и событием alert.received."""

from __future__ import annotations

import html
import logging
from uuid import UUID

import asyncpg
from fastapi import APIRouter, Depends, HTTPException, Request
from fastapi.responses import HTMLResponse
from pydantic import BaseModel, Field

from onguard24.deps import get_pool
from onguard24.domain.events import AlertReceived, DomainEvent, EventBus
from onguard24.modules.ui_support import wrap_module_html_page

log = logging.getLogger(__name__)

router = APIRouter(tags=["module-incidents"])
ui_router = APIRouter(tags=["web-incidents"], include_in_schema=False)


class IncidentCreate(BaseModel):
    title: str = Field(..., min_length=1, max_length=500)
    status: str = Field(default="open", max_length=64)
    severity: str = Field(default="warning", max_length=32)


def register_events(bus: EventBus, pool: asyncpg.Pool | None = None) -> None:
    if pool is None:
        return

    async def on_alert(ev: DomainEvent) -> None:
        if not isinstance(ev, AlertReceived) or ev.raw_payload_ref is None:
            return
        a = ev.alert
        title = (a.title if a else "Алерт без названия")[:500]
        sev = (a.severity.value if a else "warning")
        try:
            async with pool.acquire() as conn:
                await conn.execute(
                    """
                    INSERT INTO incidents (title, status, severity, source, ingress_event_id)
                    VALUES ($1, 'open', $2, 'grafana', $3::uuid)
                    """,
                    title,
                    sev,
                    ev.raw_payload_ref,
                )
        except Exception:
            log.exception("incidents: не удалось создать инцидент из alert.received")

    bus.subscribe("alert.received", on_alert)


async def render_home_fragment(request: Request) -> str:
    pool = get_pool(request)
    if pool is None:
        return '<p class="module-note">Нужна БД для списка инцидентов.</p>'
    try:
        async with pool.acquire() as conn:
            n = await conn.fetchval("SELECT count(*)::int FROM incidents")
    except Exception:
        return '<p class="module-note">Таблица инцидентов недоступна (миграции?).</p>'
    return f'<div class="module-fragment"><p>Инцидентов в учёте: <strong>{int(n)}</strong></p></div>'


@router.get("/")
async def list_incidents_api(
    pool: asyncpg.Pool | None = Depends(get_pool),
    limit: int = 50,
):
    if pool is None:
        return {"items": [], "database": "disabled"}
    limit = min(max(limit, 1), 200)
    async with pool.acquire() as conn:
        rows = await conn.fetch(
            """
            SELECT id, title, status, severity, source, ingress_event_id, created_at
            FROM incidents
            ORDER BY created_at DESC
            LIMIT $1
            """,
            limit,
        )
    items = []
    for r in rows:
        items.append(
            {
                "id": str(r["id"]),
                "title": r["title"],
                "status": r["status"],
                "severity": r["severity"],
                "source": r["source"],
                "ingress_event_id": str(r["ingress_event_id"]) if r["ingress_event_id"] else None,
                "created_at": r["created_at"].isoformat() if r["created_at"] else None,
            }
        )
    return {"items": items}


@router.post("/", status_code=201)
async def create_incident_api(
    body: IncidentCreate,
    pool: asyncpg.Pool | None = Depends(get_pool),
):
    if pool is None:
        raise HTTPException(status_code=503, detail="database disabled")
    async with pool.acquire() as conn:
        row = await conn.fetchrow(
            """
            INSERT INTO incidents (title, status, severity, source)
            VALUES ($1, $2, $3, 'manual')
            RETURNING id, title, status, severity, source, ingress_event_id, created_at
            """,
            body.title.strip(),
            body.status,
            body.severity,
        )
    return {
        "id": str(row["id"]),
        "title": row["title"],
        "status": row["status"],
        "severity": row["severity"],
        "source": row["source"],
        "ingress_event_id": None,
        "created_at": row["created_at"].isoformat() if row["created_at"] else None,
    }


@router.get("/{incident_id}")
async def get_incident_api(incident_id: UUID, pool: asyncpg.Pool | None = Depends(get_pool)):
    if pool is None:
        raise HTTPException(status_code=503, detail="database disabled")
    async with pool.acquire() as conn:
        row = await conn.fetchrow(
            """
            SELECT id, title, status, severity, source, ingress_event_id, created_at
            FROM incidents WHERE id = $1::uuid
            """,
            incident_id,
        )
    if not row:
        raise HTTPException(status_code=404, detail="not found")
    return {
        "id": str(row["id"]),
        "title": row["title"],
        "status": row["status"],
        "severity": row["severity"],
        "source": row["source"],
        "ingress_event_id": str(row["ingress_event_id"]) if row["ingress_event_id"] else None,
        "created_at": row["created_at"].isoformat() if row["created_at"] else None,
    }


@ui_router.get("/", response_class=HTMLResponse)
async def incidents_ui_home(request: Request):
    pool = get_pool(request)
    rows_html = ""
    err = ""
    if pool is None:
        err = "<p>База данных не настроена.</p>"
    else:
        try:
            async with pool.acquire() as conn:
                rows = await conn.fetch(
                    """
                    SELECT id, title, status, severity, source, created_at
                    FROM incidents
                    ORDER BY created_at DESC
                    LIMIT 100
                    """
                )
            for r in rows:
                rows_html += (
                    "<tr>"
                    f"<td>{html.escape(str(r['id']))[:8]}…</td>"
                    f"<td>{html.escape(r['title'])}</td>"
                    f"<td>{html.escape(r['status'])}</td>"
                    f"<td>{html.escape(r['severity'])}</td>"
                    f"<td>{html.escape(r['source'])}</td>"
                    "</tr>"
                )
        except Exception as e:
            err = f"<p class=\"module-err\">{html.escape(str(e))}</p>"
    inner = f"""<h1>Инциденты</h1>
{err}
<table class="irm-table">
<thead><tr><th>ID</th><th>Заголовок</th><th>Статус</th><th>Важность</th><th>Источник</th></tr></thead>
<tbody>{rows_html or '<tr><td colspan="5">Пока нет записей</td></tr>'}</tbody>
</table>
<p><small>Создание из Grafana: webhook → запись в <code>ingress_events</code> → событие → строка здесь.</small></p>"""
    return HTMLResponse(
        wrap_module_html_page(
            document_title="Инциденты — onGuard24",
            current_slug="incidents",
            main_inner_html=inner,
        )
    )