import html
from urllib.parse import quote

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

from app.auth import require_user
from app.db.audit import log_audit_event
from app.db.jobs import create_job, get_jobs, get_jobs_by_types
from app.routes.jobs import render_job_status
from app.templates.layout import page

router = APIRouter()


# Klíčové AppFactory komponenty, které lze z Portálu znovu nasadit. Pořadí určuje zobrazení v UI.
# key      – identifikátor komponenty (target_id jobu i suffix job typu / shell skriptu)
# name     – zobrazený název
# desc     – krátký popis
# icon     – FontAwesome ikona
RUNTIME_COMPONENTS = [
    ("portal", "Portal", "Webové administrační rozhraní AppFactory (tento Portál).", "fa-window-maximize"),
    ("tools", "Tools", "Sdílené provozní skripty a nástroje (appfactory-tools).", "fa-screwdriver-wrench"),
    ("webhook", "Webhook", "Příjem a zpracování Gitea webhooků (spouští deploy).", "fa-bolt"),
    ("worker", "Worker", "Centrální worker zpracovávající úlohy z fronty.", "fa-gears"),
    ("caddy", "Caddy", "Reverzní proxy a TLS pro Portál i služby.", "fa-shield-halved"),
    ("gitea", "Gitea", "Git server a registr repozitářů.", "fa-code-branch"),
    ("registry", "Registry", "Docker registr s image jednotlivých služeb.", "fa-box-archive"),
]

# Mapování komponenty -> typ jobu. Job typy budou později mapovány na maintenance/redeploy-<key>.sh.
COMPONENT_JOB_TYPE = {key: f"redeploy-{key}" for key, _name, _desc, _icon in RUNTIME_COMPONENTS}
RUNTIME_JOB_TYPES = tuple(COMPONENT_JOB_TYPE.values())
COMPONENT_NAMES = {key: name for key, name, _desc, _icon in RUNTIME_COMPONENTS}

DASHBOARD_LIMIT = 20


def require_admin(user: dict) -> None:
    if (user.get("role") or "").lower() != "admin":
        raise HTTPException(status_code=403, detail="Runtime Management je dostupný pouze administrátorům")


def _last_action_for(job_type: str) -> str:
    jobs = get_jobs(job_type=job_type, limit=1)
    if not jobs:
        return '<span class="muted">—</span>'
    job = jobs[0]
    job_id = html.escape(str(job.get("id", "")))
    created_at = html.escape(job.get("created_at", "") or "")
    status = render_job_status(job.get("status"))
    return f'{status}<br><a href="/portal/jobs/{job_id}"><small>{created_at} · #{job_id}</small></a>'


@router.get("/admin/runtime", response_class=HTMLResponse)
def runtime_page(request: Request, message: str = "", error: str = "", user=Depends(require_user)):
    require_admin(user)

    notice = ""
    if message:
        notice = f'<p class="alert">{html.escape(message)}</p>'
    if error:
        notice = f'<p class="alert alert-danger">{html.escape(error)}</p>'

    component_rows = ""
    for key, name, desc, icon in RUNTIME_COMPONENTS:
        last_action = _last_action_for(COMPONENT_JOB_TYPE[key])
        component_rows += f"""
        <tr>
            <td><strong><i class="fa-solid {icon}" aria-hidden="true"></i> {html.escape(name)}</strong></td>
            <td>{html.escape(desc)}</td>
            <td>{last_action}</td>
            <td class="actions-cell">
                <form method="post" action="/portal/admin/runtime/redeploy/{key}" class="inline-form"
                      onsubmit="return confirm('Opravdu chcete redeploy komponenty {html.escape(name)}?');">
                    <button type="submit"><i class="fa-solid fa-rotate" aria-hidden="true"></i> Redeploy</button>
                </form>
            </td>
        </tr>
        """

    job_rows = ""
    for job in get_jobs_by_types(RUNTIME_JOB_TYPES, limit=DASHBOARD_LIMIT):
        job_id = html.escape(str(job.get("id", "")))
        created_at = html.escape(job.get("created_at", "") or "")
        job_type = html.escape(job.get("type", "") or "")
        status = render_job_status(job.get("status"))
        result_text = job.get("error_text") or job.get("result_json") or ""
        result_preview = result_text if len(result_text) <= 160 else f"{result_text[:157]}..."
        result_cell = f"<code>{html.escape(result_preview)}</code>" if result_preview else '<span class="muted">—</span>'
        job_rows += f"""
        <tr>
            <td>{created_at}</td>
            <td><a href="/portal/jobs/{job_id}">{job_type}</a></td>
            <td>{status}</td>
            <td>{result_cell}</td>
        </tr>
        """

    if not job_rows:
        job_rows = '<tr><td colspan="4">Zatím nebyly spuštěné žádné runtime operace.</td></tr>'

    return page(
        "Runtime Management",
        f"""
        <div class="card">
            <h2><i class="fa-solid fa-server" aria-hidden="true"></i> Runtime Management</h2>
            <p class="muted">
                Centrální správa klíčových AppFactory komponent. Redeploy nespouští akci přímo —
                vytvoří úlohu do fronty, kterou zpracuje worker. Dostupné pouze administrátorům.
            </p>
            {notice}
        </div>

        <div class="card">
            <h2>Komponenty</h2>
            <table>
                <tr>
                    <th>Název</th>
                    <th>Popis</th>
                    <th>Poslední spuštění akce</th>
                    <th>Akce</th>
                </tr>
                {component_rows}
            </table>
        </div>

        <div class="card">
            <h2>Posledních {DASHBOARD_LIMIT} runtime operací</h2>
            <table>
                <tr>
                    <th>Čas</th>
                    <th>Typ</th>
                    <th>Stav</th>
                    <th>Výsledek</th>
                </tr>
                {job_rows}
            </table>
        </div>
        """,
        user=user,
    )


@router.post("/admin/runtime/redeploy/{component}")
def runtime_redeploy_action(component: str, user=Depends(require_user)):
    require_admin(user)

    if component not in COMPONENT_JOB_TYPE:
        raise HTTPException(status_code=404, detail="Neznámá komponenta")

    job_type = COMPONENT_JOB_TYPE[component]
    name = COMPONENT_NAMES[component]
    job_id = create_job(
        job_type=job_type,
        target_type="runtime",
        target_id=component,
        payload={"component": component},
        user=user,
        source="portal_runtime",
    )
    log_audit_event(
        user,
        action="runtime.redeploy",
        target_type="runtime",
        target_id=component,
        metadata={"component": component, "job_type": job_type, "job_id": job_id},
    )
    return RedirectResponse(
        url="/portal/admin/runtime?message=" + quote(f"Redeploy komponenty {name} byl zařazen do fronty (úloha #{job_id})."),
        status_code=303,
    )