import html
import json
from urllib.parse import quote

from fastapi import APIRouter, Depends, Form, 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_by_target_ids
from app.routes.jobs import render_job_status
from app.templates.layout import page

router = APIRouter()

# Portál NEMÁ vlastní deploy logiku. Všechny provozní akce deleguje do existujících shell skriptů
# v appfactory-tools přes existující job systém (job_type="run_script"; worker spustí scripts/<script>).
DEPLOY_CORE_SCRIPT = "deploy-core-service.sh"
CADDY_SCRIPT = "generate-caddyfile.sh"
ENABLED_APPS_SCRIPT = "redeploy-enabled-apps.sh"

# Skripty považované za "runtime operace" (filtr dashboardu).
RUNTIME_SCRIPTS = (DEPLOY_CORE_SCRIPT, CADDY_SCRIPT, ENABLED_APPS_SCRIPT)

ALL_CORE_KEY = "redeploy-all-core"
ALL_CORE_LABEL = "Redeploy All Core Services"
ALL_CORE_ICON = "fa-server"

# Core služby nasazované přes deploy-core-service.sh <service>. (key, name, icon, service_arg)
CORE_SERVICES = [
    ("redeploy-portal", "Portal", "fa-window-maximize", "appfactory-portal"),
    ("redeploy-worker", "Worker", "fa-gears", "appfactory-worker"),
    ("redeploy-webhook", "Webhook", "fa-bolt", "appfactory-webhook"),
    ("redeploy-monitor", "Monitor", "fa-heart-pulse", "appfactory-monitor"),
    ("redeploy-gateway", "Gateway (Caddy)", "fa-shield-halved", "appfactory-caddy"),
    ("redeploy-gitea", "Gitea", "fa-code-branch", "appfactory-gitea"),
    ("redeploy-registry", "Registry", "fa-box-archive", "appfactory-registry"),
]

# Spustitelné akce: key -> (label, icon, script_name, args). ALL_CORE_KEY je speciální (smyčka přes core).
ACTION_MAP: dict[str, tuple[str, str, str, list[str]]] = {}
for _key, _name, _icon, _arg in CORE_SERVICES:
    ACTION_MAP[_key] = (f"Redeploy {_name}", _icon, DEPLOY_CORE_SCRIPT, [_arg])
ACTION_MAP["regenerate-caddy"] = ("Regenerate Caddy", "fa-shield-halved", CADDY_SCRIPT, [])
ACTION_MAP["redeploy-enabled-apps"] = ("Redeploy Enabled Apps", "fa-rocket", ENABLED_APPS_SCRIPT, [])

# Pořadí tlačítek po uložení .env (Environment stránka) – dle zadání.
ENV_ACTION_KEYS = [
    "regenerate-caddy",
    "redeploy-portal",
    "redeploy-worker",
    "redeploy-webhook",
    "redeploy-monitor",
    "redeploy-gateway",
    "redeploy-gitea",
    "redeploy-registry",
    ALL_CORE_KEY,
]
# Globální tlačítka na Runtime Management stránce (mimo tabulku core služeb).
RUNTIME_GLOBAL_ACTION_KEYS = ["regenerate-caddy", "redeploy-enabled-apps", ALL_CORE_KEY]

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 _is_valid_action(action_key: str) -> bool:
    return action_key == ALL_CORE_KEY or action_key in ACTION_MAP


def _button_meta(action_key: str) -> tuple[str, str]:
    if action_key == ALL_CORE_KEY:
        return ALL_CORE_LABEL, ALL_CORE_ICON
    label, icon, _script, _args = ACTION_MAP[action_key]
    return label, icon


def enqueue_script_job(script_name: str, args: list[str], user: dict, target_label: str) -> int:
    """Vytvoří run_script job do existující fronty (worker spustí scripts/<script_name> s args)
    a zaaudituje akci (bez hodnot proměnných). Vrací job_id."""
    args = list(args or [])
    payload = {"script_name": script_name}
    if args:
        payload["args"] = args
        payload["arguments"] = args
    job_id = create_job(
        job_type="run_script",
        target_type="maintenance_script",
        target_id=script_name,
        payload=payload,
        user=user,
        source="portal_runtime",
    )
    log_audit_event(
        user,
        action="runtime.action",
        target_type="runtime",
        target_id=target_label,
        metadata={"script_name": script_name, "args": args, "job_id": job_id},
    )
    return job_id


def run_action(action_key: str, user: dict) -> str:
    """Spustí runtime akci podle klíče. Vrací zprávu pro uživatele."""
    if action_key == ALL_CORE_KEY:
        job_ids = [enqueue_script_job(DEPLOY_CORE_SCRIPT, [arg], user, arg) for _k, _n, _i, arg in CORE_SERVICES]
        return f"Redeploy všech core služeb byl zařazen do fronty ({len(job_ids)} úloh)."
    label, _icon, script, args = ACTION_MAP[action_key]
    job_id = enqueue_script_job(script, args, user, label)
    return f"Akce {label} byla zařazena do fronty (úloha #{job_id})."


def render_action_buttons(keys: list[str], next_url: str) -> str:
    next_html = html.escape(next_url, quote=True)
    buttons = ""
    for key in keys:
        label, icon = _button_meta(key)
        buttons += f"""
        <form method="post" action="/portal/admin/runtime/action/{key}" class="inline-form"
              onsubmit="return confirm('Spustit akci {html.escape(label)}?');">
            <input type="hidden" name="next" value="{next_html}">
            <button type="submit"><i class="fa-solid {icon}" aria-hidden="true"></i> {html.escape(label)}</button>
        </form>
        """
    return buttons


def _job_args(job: dict) -> list[str]:
    try:
        payload = json.loads(job.get("payload_json") or "{}")
    except (TypeError, ValueError):
        return []
    args = payload.get("args") or payload.get("arguments") or []
    return [str(a) for a in args] if isinstance(args, list) else []


def _job_script_label(job: dict) -> str:
    target = job.get("target_id") or job.get("type") or ""
    args = _job_args(job)
    return f"{target} {' '.join(args)}".strip()


def _core_last_runs() -> dict:
    """Najde poslední deploy-core-service.sh job pro každou core službu (podle argumentu v payloadu)."""
    latest: dict[str, dict] = {}
    for job in get_jobs_by_target_ids([DEPLOY_CORE_SCRIPT], limit=80):
        args = _job_args(job)
        service = args[0] if args else None
        if service and service not in latest:
            latest[service] = job
    return latest


def _render_last_run(job: dict | None) -> str:
    if not job:
        return '<span class="muted">—</span>'
    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>'

    last_runs = _core_last_runs()
    component_rows = ""
    for key, name, icon, service_arg in CORE_SERVICES:
        component_rows += f"""
        <tr>
            <td><strong><i class="fa-solid {icon}" aria-hidden="true"></i> {html.escape(name)}</strong></td>
            <td><code>{html.escape(service_arg)}</code></td>
            <td>{_render_last_run(last_runs.get(service_arg))}</td>
            <td class="actions-cell">
                <form method="post" action="/portal/admin/runtime/action/{key}" class="inline-form"
                      onsubmit="return confirm('Spustit redeploy služby {html.escape(name)}?');">
                    <input type="hidden" name="next" value="/portal/admin/runtime">
                    <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_target_ids(RUNTIME_SCRIPTS, limit=DASHBOARD_LIMIT):
        job_id = html.escape(str(job.get("id", "")))
        created_at = html.escape(job.get("created_at", "") or "")
        script_label = html.escape(_job_script_label(job))
        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}">{script_label}</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. Akce nespouští docker přímo —
                vytvoří úlohu do fronty, kterou zpracuje worker (existující shell skripty v appfactory-tools).
                Dostupné pouze administrátorům.
            </p>
            {notice}
        </div>

        <div class="card">
            <h2><i class="fa-solid fa-cubes" aria-hidden="true"></i> Core služby</h2>
            <p class="muted">Redeploy přes <code>{html.escape(DEPLOY_CORE_SCRIPT)} &lt;service&gt;</code>.</p>
            <table>
                <thead>
                    <tr>
                        <th>Komponenta</th>
                        <th>Service</th>
                        <th>Poslední spuštění</th>
                        <th>Akce</th>
                    </tr>
                </thead>
                <tbody>{component_rows}</tbody>
            </table>
        </div>

        <div class="card">
            <h2><i class="fa-solid fa-bolt" aria-hidden="true"></i> Globální akce</h2>
            <div class="inline-form">
                {render_action_buttons(RUNTIME_GLOBAL_ACTION_KEYS, "/portal/admin/runtime")}
            </div>
        </div>

        <div class="card">
            <h2><i class="fa-solid fa-list-check" aria-hidden="true"></i> Posledních {DASHBOARD_LIMIT} runtime operací</h2>
            <table>
                <thead>
                    <tr>
                        <th>Čas</th>
                        <th>Skript</th>
                        <th>Stav</th>
                        <th>Výsledek</th>
                    </tr>
                </thead>
                <tbody>{job_rows}</tbody>
            </table>
        </div>
        """,
        user=user,
    )


@router.post("/admin/runtime/action/{action_key}")
def runtime_action(action_key: str, next: str = Form("/portal/admin/runtime"), user=Depends(require_user)):
    require_admin(user)
    if not _is_valid_action(action_key):
        raise HTTPException(status_code=404, detail="Neznámá akce")

    message = run_action(action_key, user)
    redirect_to = next if next.startswith("/portal/admin/") else "/portal/admin/runtime"
    return RedirectResponse(url=f"{redirect_to}?message=" + quote(message), status_code=303)