import html
from urllib.parse import quote

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

from app.auth import require_user
from app.db.audit import log_audit_event
from app.db.incidents import get_open_incidents, get_recent_incidents
from app.templates.layout import page

router = APIRouter()


def format_duration(seconds) -> str:
    if seconds is None or seconds == "":
        return ""
    try:
        total = max(0, int(seconds))
    except (TypeError, ValueError):
        return ""

    hours, remainder = divmod(total, 3600)
    minutes, secs = divmod(remainder, 60)
    if hours:
        return f"{hours} h {minutes} min"
    if minutes:
        return f"{minutes} min {secs} s"
    return f"{secs} s"


def render_incident_status(status: str | None) -> str:
    value = status or ""
    normalized = value.lower()
    labels = {
        "open": "otev\u0159en\u00fd",
        "resolved": "vy\u0159e\u0161en\u00fd",
    }
    class_name = "pill pill-muted"
    if normalized == "open":
        class_name = "pill pill-danger"
    elif normalized == "resolved":
        class_name = "pill pill-success"
    return f'<span class="{class_name}">{html.escape(labels.get(normalized, value))}</span>'


def render_open_incident_rows(incidents: list[dict]) -> str:
    rows = ""
    for incident in incidents:
        service_id = incident.get("service_id", "") or ""
        service_name = html.escape(incident.get("service_name") or service_id)
        title = html.escape(incident.get("title", "") or "")
        started_at = html.escape(incident.get("started_at", "") or "")
        duration = format_duration(incident.get("duration_seconds"))
        if not duration:
            duration = "prob\u00edh\u00e1"
        rows += f"""
        <tr>
            <td><a href="/portal/apps/{quote(service_id, safe='')}">{service_name}</a></td>
            <td>{title}</td>
            <td>{started_at}</td>
            <td>{html.escape(duration)}</td>
        </tr>
        """

    if not rows:
        rows = '<tr><td colspan="4">\u017d\u00e1dn\u00e9 aktivn\u00ed incidenty.</td></tr>'
    return rows


def render_incident_history_rows(incidents: list[dict], include_service: bool = True) -> str:
    rows = ""
    for incident in incidents:
        service_id = incident.get("service_id", "") or ""
        service_name = html.escape(incident.get("service_name") or service_id)
        title = html.escape(incident.get("title", "") or "")
        started_at = html.escape(incident.get("started_at", "") or "")
        ended_at = html.escape(incident.get("ended_at", "") or "")
        duration = html.escape(format_duration(incident.get("duration_seconds")))
        status = render_incident_status(incident.get("status"))
        service_cell = f'<td><a href="/portal/apps/{quote(service_id, safe="")}">{service_name}</a></td>' if include_service else ""
        rows += f"""
        <tr>
            {service_cell}
            <td>{title}</td>
            <td>{started_at}</td>
            <td>{ended_at}</td>
            <td>{duration}</td>
            <td>{status}</td>
        </tr>
        """

    colspan = 6 if include_service else 5
    if not rows:
        rows = f'<tr><td colspan="{colspan}">Zat\u00edm nejsou evidovan\u00e9 \u017e\u00e1dn\u00e9 incidenty.</td></tr>'
    return rows


@router.get("/incidents", response_class=HTMLResponse)
def incidents_page(request: Request, user=Depends(require_user)):
    open_incidents = get_open_incidents()
    recent_incidents = get_recent_incidents(limit=100)
    log_audit_event(
        user,
        action="incidents.view",
        target_type="incidents",
        metadata={"open": len(open_incidents), "history": len(recent_incidents)},
    )

    return page(
        "Incidenty",
        f"""
        <div class="card">
            <h2>Incidenty</h2>
            <p class="muted">P\u0159ehled incident\u016f vytv\u00e1\u0159en\u00fdch a uzav\u00edran\u00fdch monitorem.</p>
        </div>

        <div class="card">
            <h2>Aktivn\u00ed incidenty</h2>
            <table>
                <tr>
                    <th>Slu\u017eba</th>
                    <th>N\u00e1zev</th>
                    <th>Za\u010d\u00e1tek</th>
                    <th>Trv\u00e1n\u00ed</th>
                </tr>
                <tbody data-live-table="incidents.active">{render_open_incident_rows(open_incidents)}</tbody>
            </table>
        </div>

        <div class="card">
            <h2>Historie incident\u016f</h2>
            <table>
                <tr>
                    <th>Slu\u017eba</th>
                    <th>N\u00e1zev</th>
                    <th>Za\u010d\u00e1tek</th>
                    <th>Konec</th>
                    <th>Trv\u00e1n\u00ed</th>
                    <th>Stav</th>
                </tr>
                <tbody data-live-table="incidents.recent">{render_incident_history_rows(recent_incidents)}</tbody>
            </table>
        </div>
        <script src="/portal/static/operations-live.js"></script>
        """,
        user=user,
    )