import html
import json
from urllib.parse import quote

from fastapi import APIRouter, Depends, HTTPException, Request
from fastapi.responses import HTMLResponse

from app.auth import require_user
from app.db.audit import log_audit_event
from app.db.workers import get_worker, get_workers
from app.templates.layout import page

router = APIRouter()


def render_worker_badge(online: bool) -> str:
    if online:
        return '<span class="pill pill-success">ONLINE</span>'
    return '<span class="pill pill-danger">OFFLINE</span>'


def pretty_json(value: str | None) -> str:
    if not value:
        return "{}"

    try:
        return json.dumps(json.loads(value), ensure_ascii=False, indent=2, sort_keys=True)
    except (TypeError, ValueError):
        return value


@router.get("/workers", response_class=HTMLResponse)
def workers_page(request: Request, user=Depends(require_user)):
    workers = get_workers()
    online_count = sum(1 for worker in workers if worker.get("online"))
    total_count = len(workers)
    offline_count = total_count - online_count

    log_audit_event(
        user,
        action="workers.view",
        target_type="workers",
        metadata={
            "online": online_count,
            "offline": offline_count,
            "total": total_count,
        },
    )

    rows = ""
    for worker in workers:
        worker_id_raw = worker.get("worker_id", "") or ""
        worker_id = html.escape(worker_id_raw)
        worker_url_id = quote(worker_id_raw, safe="")
        status = html.escape(worker.get("status", "") or "")
        last_seen_at = html.escape(worker.get("last_seen_at", "") or "")
        started_at = html.escape(worker.get("started_at", "") or "")
        badge = render_worker_badge(bool(worker.get("online")))
        current_job_id = worker.get("current_job_id")
        current_job = ""
        if current_job_id is not None:
            current_job_label = html.escape(str(current_job_id))
            current_job = f'<a href="/portal/jobs/{current_job_label}">#{current_job_label}</a>'

        rows += f"""
        <tr>
            <td>
                <strong><a href="/portal/workers/{worker_url_id}">{worker_id}</a></strong>
            </td>
            <td>{badge}<br><span class="muted">{status}</span></td>
            <td>{last_seen_at}</td>
            <td>{current_job}</td>
            <td>{started_at}</td>
            <td class="actions-cell"><a class="btn" href="/portal/workers/{worker_url_id}">Detail</a></td>
        </tr>
        """

    if not rows:
        rows = '<tr><td colspan="6">Zatím nejsou evidovaní žádní workeři.</td></tr>'

    return page(
        "Workers",
        f"""
        <div class="card">
            <h2>Workers</h2>
            <p class="muted">Přehled worker procesů obsluhujících AppFactory joby.</p>
        </div>

        <div class="stats-grid">
            <div class="stat-card stat-success"><span>Online Workers</span><strong>{online_count}</strong></div>
            <div class="stat-card stat-danger"><span>Offline Workers</span><strong>{offline_count}</strong></div>
            <div class="stat-card stat-total"><span>Total Workers</span><strong>{total_count}</strong></div>
        </div>

        <div class="card">
            <h2>Workers</h2>
            <table>
                <tr>
                    <th>Worker ID</th>
                    <th>Status</th>
                    <th>Last Seen</th>
                    <th>Current Job</th>
                    <th>Started At</th>
                    <th>Akce</th>
                </tr>
                {rows}
            </table>
        </div>
        """,
        user=user,
    )


@router.get("/workers/{worker_id}", response_class=HTMLResponse)
def worker_detail_page(worker_id: str, request: Request, user=Depends(require_user)):
    worker = get_worker(worker_id)
    if not worker:
        raise HTTPException(status_code=404, detail="Worker not found")

    log_audit_event(
        user,
        action="workers.view",
        target_type="worker",
        target_id=worker_id,
    )

    worker_id_html = html.escape(worker.get("worker_id", "") or "")
    status = html.escape(worker.get("status", "") or "")
    last_seen_at = html.escape(worker.get("last_seen_at", "") or "")
    started_at = html.escape(worker.get("started_at", "") or "")
    badge = render_worker_badge(bool(worker.get("online")))
    current_job_id = worker.get("current_job_id")
    current_job = ""
    if current_job_id is not None:
        current_job_label = html.escape(str(current_job_id))
        current_job = f'<a href="/portal/jobs/{current_job_label}">#{current_job_label}</a>'

    metadata = html.escape(pretty_json(worker.get("metadata_json")))
    metadata_block = ""
    if worker.get("metadata_json"):
        metadata_block = f"""
        <div class="card">
            <h2>Metadata</h2>
            <pre class="log-viewer log-stdout">{metadata}</pre>
        </div>
        """

    return page(
        f"Worker {worker_id_html}",
        f"""
        <div class="card">
            <h2>Worker {worker_id_html}</h2>
            <p>
                <a class="btn" href="/portal/workers">&larr; Zpět na workers</a>
            </p>
        </div>

        <div class="card">
            <h2>Souhrn</h2>
            <table>
                <tr><th>Worker ID</th><td>{worker_id_html}</td></tr>
                <tr><th>Status</th><td>{badge}<br><span class="muted">{status}</span></td></tr>
                <tr><th>Last Seen</th><td>{last_seen_at}</td></tr>
                <tr><th>Current Job</th><td>{current_job}</td></tr>
                <tr><th>Started At</th><td>{started_at}</td></tr>
            </table>
        </div>

        {metadata_block}
        """,
        user=user,
    )