import asyncio
import html
from urllib.parse import quote

from fastapi import APIRouter, Depends, Request, WebSocket, WebSocketDisconnect
from fastapi.responses import HTMLResponse

from app.auth import current_user, require_user
from app.db.audit import log_audit_event
from app.db.operations import (
    get_operations_snapshot,
)
from app.routes.deployments import render_status_pill
from app.routes.incidents import render_incident_history_rows, render_open_incident_rows
from app.routes.jobs import render_job_status
from app.templates.layout import page

router = APIRouter()


@router.websocket("/ws/operations")
async def operations_websocket(websocket: WebSocket):
    user = current_user(websocket)
    if not user:
        await websocket.close(code=1008)
        return

    await websocket.accept()
    try:
        while True:
            await websocket.send_json(get_operations_snapshot())
            await asyncio.sleep(2)
    except WebSocketDisconnect:
        return


def render_recent_jobs(jobs: list[dict]) -> str:
    rows = ""
    for job in jobs:
        job_id = html.escape(str(job.get("id", "")))
        job_type = html.escape(job.get("type", "") or "")
        target_type = html.escape(job.get("target_type", "") or "")
        target_id = html.escape(job.get("target_id", "") or "")
        source = html.escape(job.get("source", "") or "")
        created_at = html.escape(job.get("created_at", "") or "")

        rows += f"""
        <tr>
            <td><strong><a href="/portal/jobs/{job_id}">#{job_id}</a></strong></td>
            <td>{render_job_status(job.get("status"))}</td>
            <td>{job_type}</td>
            <td>{target_type}: <strong>{target_id}</strong></td>
            <td>{source}</td>
            <td>{created_at}</td>
        </tr>
        """

    if not rows:
        rows = '<tr><td colspan="6">Zatím nejsou evidované žádné joby.</td></tr>'

    return rows


def render_recent_deployments(deployments: list[dict]) -> str:
    rows = ""
    for deployment in deployments:
        deployment_id = html.escape(str(deployment.get("id", "")))
        raw_app_id = deployment.get("app_id", "") or ""
        app_id = html.escape(raw_app_id)
        app_url_id = quote(raw_app_id, safe="")
        kind = html.escape(deployment.get("kind", "") or "")
        started_at = html.escape(deployment.get("started_at", "") or "")
        finished_at = html.escape(deployment.get("finished_at", "") or "")
        source = html.escape(deployment.get("trigger_source", "") or "")

        rows += f"""
        <tr>
            <td><strong><a href="/portal/deployments/{deployment_id}">#{deployment_id}</a></strong></td>
            <td><a href="/portal/apps/{app_url_id}">{app_id}</a></td>
            <td>{kind}</td>
            <td>{render_status_pill(deployment.get("status"))}</td>
            <td>{source}</td>
            <td>{started_at}</td>
            <td>{finished_at}</td>
        </tr>
        """

    if not rows:
        rows = '<tr><td colspan="7">Zatím nejsou evidovaná žádná nasazení.</td></tr>'

    return rows


def render_recent_audit_events(events: list[dict]) -> str:
    rows = ""
    for event in events:
        rows += f"""
        <tr>
            <td>{html.escape(event.get("created_at", "") or "")}</td>
            <td>{html.escape(event.get("username", "") or "")}</td>
            <td><span class="pill pill-muted">{html.escape(event.get("action", "") or "")}</span></td>
            <td>{html.escape(event.get("target_type", "") or "")}</td>
            <td>{html.escape(str(event.get("target_id") or ""))}</td>
            <td>{html.escape(event.get("source", "") or "")}</td>
        </tr>
        """

    if not rows:
        rows = '<tr><td colspan="6">Zatím nejsou evidované žádné auditní události.</td></tr>'

    return rows


def render_health_status(status: str | None) -> str:
    value = status or ""
    normalized = value.lower()
    labels = {
        "healthy": "zdravá",
        "unhealthy": "nezdravá",
        "unreachable": "nedostupná",
    }
    class_name = "pill pill-muted"
    if normalized == "healthy":
        class_name = "pill pill-success"
    elif normalized == "unhealthy":
        class_name = "pill pill-warning"
    elif normalized == "unreachable":
        class_name = "pill pill-danger"
    return f'<span class="{class_name}">{html.escape(labels.get(normalized, value))}</span>'


def render_health_problems(items: list[dict]) -> str:
    rows = ""
    for item in items:
        service_id = html.escape(item.get("service_id", "") or "")
        service_name = html.escape(item.get("service_name") or item.get("service_id", "") or "")
        error_text = item.get("error_text", "") or ""
        error_preview = error_text if len(error_text) <= 120 else f"{error_text[:117]}..."
        rows += f"""
        <tr>
            <td><a href="/portal/apps/{quote(service_id, safe='')}">{service_name}</a></td>
            <td>{render_health_status(item.get("status"))}</td>
            <td>{html.escape(item.get("checked_at", "") or "")}</td>
            <td>{html.escape(str(item.get("response_time_ms") or ""))}</td>
            <td>{html.escape(error_preview)}</td>
        </tr>
        """

    if not rows:
        rows = '<tr><td colspan="5">Žádné služby nevyžadují pozornost.</td></tr>'
    return rows


@router.get("/operations", response_class=HTMLResponse)
def operations_dashboard(request: Request, user=Depends(require_user)):
    snapshot = get_operations_snapshot()
    log_audit_event(
        user,
        action="operations.dashboard.view",
        target_type="operations",
        metadata={
            "jobs": {
                "queued": snapshot["jobs"]["queued"],
                "running": snapshot["jobs"]["running"],
                "failed_24h": snapshot["jobs"]["failed_24h"],
            },
            "workers": {
                "online": snapshot["workers"]["online"],
                "offline": snapshot["workers"]["offline"],
            },
            "deployments": {
                "running": snapshot["deployments"]["running"],
                "failed_24h": snapshot["deployments"]["failed_24h"],
            },
            "incidents": {
                "open": snapshot["incidents"]["open"],
            },
        },
    )

    return page(
        "Přehled",
        f"""
        <div class="card">
            <h2>Přehled systému</h2>
            <p class="muted">Rychlá odpověď na otázku, zda jsou služby, úlohy a nasazení v pořádku.</p>
        </div>

        <div class="stats-grid">
            <div class="stat-card stat-success"><span>Běžící služby</span><strong data-live-count="apps.active">{snapshot["apps"]["active"]}</strong></div>
            <div class="stat-card stat-danger"><span>Problémové služby</span><strong data-live-count="apps.problematic">{snapshot["apps"]["problematic"]}</strong></div>
            <div class="stat-card stat-success"><span>Zdravé služby</span><strong data-live-count="health.healthy">{snapshot["health"]["healthy"]}</strong></div>
            <div class="stat-card stat-warning"><span>Nezdravé služby</span><strong data-live-count="health.unhealthy">{snapshot["health"]["unhealthy"]}</strong></div>
            <div class="stat-card stat-danger"><span>Nedostupné služby</span><strong data-live-count="health.unreachable">{snapshot["health"]["unreachable"]}</strong></div>
            <div class="stat-card stat-danger"><span>Aktivní incidenty</span><strong data-live-count="incidents.open">{snapshot["incidents"]["open"]}</strong></div>
            <div class="stat-card stat-warning"><span>Aktivní úlohy</span><strong data-live-count="jobs.running">{snapshot["jobs"]["running"]}</strong></div>
            <div class="stat-card stat-total"><span>Nasazení dnes</span><strong data-live-count="deployments.today">{snapshot["deployments"]["today"]}</strong></div>
            <div class="stat-card stat-success"><span>Online workery</span><strong data-live-count="workers.online">{snapshot["workers"]["online"]}</strong></div>
            <div class="stat-card stat-danger"><span>Selhané úlohy (24 h)</span><strong data-live-count="jobs.failed_24h">{snapshot["jobs"]["failed_24h"]}</strong></div>
        </div>

        <div class="card">
            <h2>Služby vyžadující pozornost</h2>
            <table>
                <tr>
                    <th>Služba</th>
                    <th>Status</th>
                    <th>Poslední kontrola</th>
                    <th>Odezva</th>
                    <th>Chyba</th>
                </tr>
                <tbody data-live-table="health.problems">{render_health_problems(snapshot["health"]["problems"])}</tbody>
            </table>
        </div>

        <div class="card">
            <h2>Aktivní incidenty</h2>
            <table>
                <tr>
                    <th>Služba</th>
                    <th>Název</th>
                    <th>Začátek</th>
                    <th>Trvání</th>
                </tr>
                <tbody data-live-table="incidents.active">{render_open_incident_rows(snapshot["incidents"]["active"])}</tbody>
            </table>
        </div>

        <div class="card">
            <h2>Poslední neúspěšná nasazení</h2>
            <table>
                <tr>
                    <th>ID</th>
                    <th>Služba</th>
                    <th>Typ</th>
                    <th>Status</th>
                    <th>Zdroj</th>
                    <th>Spuštěno</th>
                    <th>Dokončeno</th>
                </tr>
                <tbody data-live-table="deployments.failed">{render_recent_deployments(snapshot["deployments"]["recent_failed"])}</tbody>
            </table>
        </div>

        <div class="card">
            <h2>Poslední incidenty</h2>
            <table>
                <tr>
                    <th>Služba</th>
                    <th>Název</th>
                    <th>Začátek</th>
                    <th>Konec</th>
                    <th>Trvání</th>
                    <th>Stav</th>
                </tr>
                <tbody data-live-table="incidents.recent">{render_incident_history_rows(snapshot["incidents"]["recent"])}</tbody>
            </table>
        </div>

        <div class="card">
            <h2>Poslední auditní události</h2>
            <table>
                <tr>
                    <th>Čas</th>
                    <th>Uživatel</th>
                    <th>Akce</th>
                    <th>Typ cíle</th>
                    <th>Cíl</th>
                    <th>Zdroj</th>
                </tr>
                <tbody data-live-table="audit.recent">{render_recent_audit_events(snapshot["audit"]["recent"])}</tbody>
            </table>
        </div>
        <script src="/portal/static/operations-live.js"></script>
        """,
        user=user,
    )