<?php

namespace App\Livewire\Admin;

use App\Services\Dns\DnsTokenCheck;
use App\Services\Proxmox\VmTemplateCheck;
use App\Services\Stripe\StripeCheck;
use App\Services\Vpn\WireguardEndpointCheck;
use App\Support\OperatingMode;
use App\Support\Readiness as ReadinessRegistry;
use App\Support\Readiness\Check;
use App\Support\Settings;
use Illuminate\Support\Carbon;
use Illuminate\Support\Facades\Gate;
use Livewire\Attributes\Layout;
use Livewire\Component;

/**
 * The one page an operator setting up a live server goes through top to
 * bottom, until nothing blocking is left — App\Support\Readiness rendered,
 * with a button on the handful of checks that have to ask a real service
 * instead of just reading a field.
 *
 * Aliased on import (`ReadinessRegistry`) rather than `use App\Support\
 * Readiness;` bare: this class is ALSO named Readiness, in the same PHP
 * process, and an unaliased reference here would resolve to itself — which
 * has no byGroup()/blocking()/isReady() — rather than to the registry.
 *
 * mount() checks the same gate as Admin\Integrations
 * (Gate::any(['hosts.manage', 'secrets.manage'])), because this page is where
 * both halves it configures — App\Support\Settings and SecretVault — come
 * back together as one list of what is missing.
 */
#[Layout('layouts.admin')]
class Readiness extends Component
{
    /**
     * Prüfschlüssel → Klasse. Die Liste IST die Erlaubnis.
     *
     * runCheck() receives its argument from wire:click in the browser — a
     * string a stranger could type into devtools just as easily as an
     * operator clicking the real button. Without this fixed map, that
     * argument would be a way to instantiate and run ANY class through app().
     * Four entries: the three on-demand checks Task 9 built (each asks a real
     * service instead of only reading a field) plus StripeCheck, which
     * already had this exact run() shape from Admin\Integrations' own
     * "Testen" button.
     */
    private const RUNNABLE = [
        'provisioning.dns_token' => DnsTokenCheck::class,
        'onboarding.wg_hub' => WireguardEndpointCheck::class,
        'provisioning.vm_template' => VmTemplateCheck::class,
        'billing.stripe_secret' => StripeCheck::class,
    ];

    /**
     * A heartbeat older than this is not shown as fresh even where the check
     * itself already says so — a display concern only. Kept in sync with
     * App\Support\Readiness\OperationChecks::STALE_AFTER_MINUTES on purpose
     * (see the docblock there for why five minutes), not re-derived from it:
     * that constant is private, and duplicating the reasoning in a comment
     * here is cheaper than making it public for one reader.
     */
    private const HEARTBEAT_KEYS = [
        'operation.scheduler' => 'heartbeat.scheduler',
        'operation.queue_provisioning' => 'heartbeat.queue_provisioning',
    ];

    /**
     * The on-demand checks' own answers, keyed by Check::key.
     *
     * Never pre-filled in mount(): DnsTokenCheck writes a real TXT record to
     * the production DNS zone the moment it runs, so nothing here may run
     * except in direct response to an operator's own click.
     *
     * @var array<string, array<string, mixed>>
     */
    public array $results = [];

    public function mount(): void
    {
        abort_unless(Gate::any(['hosts.manage', 'secrets.manage']), 403);
    }

    public function runCheck(string $key): void
    {
        $this->authorize('secrets.manage');

        // Der Schlüssel kommt aus dem Browser. Ohne diese Zeile wäre das ein
        // Weg, beliebige Klassen aufzurufen.
        $class = self::RUNNABLE[$key] ?? null;

        if ($class === null) {
            return;
        }

        $this->results[$key] = app($class)->run();
    }

    /**
     * Where an operator goes to actually fix ONE entry.
     *
     * Not always Admin\Integrations, and not always $check->tab handed
     * straight through as its ?tab=: several of the five check groups
     * predate the Integrations::TABS redesign and still carry a tab value
     * from before it — 'hosts', 'plans', 'datacenters', 'mail', 'templates'
     * and 'company' each name a DIFFERENT admin page entirely, and the
     * leftover value 'integrations' is the exact bug Task 10's fix round
     * already found and corrected for OperationChecks (it does not exist in
     * Integrations::TABS, so a link built from it lands nowhere in
     * particular — Integrations::mount() silently falls back to its own
     * first tab). Rather than repeat that history by forwarding $check->tab
     * unchecked, a value only ever becomes a ?tab= when it actually IS one
     * of Integrations::TABS; every other known value gets its own real
     * route, and anything unrecognised — including the eight checks in
     * Onboarding/Provisioning/Delivery still carrying the pre-redesign
     * 'integrations' value (Task 8's own deferred note; out of scope for
     * this task to rename) — falls back to the Integrations page's own
     * default tab rather than a dead link.
     */
    public function checkUrl(Check $check): string
    {
        if (in_array($check->tab, Integrations::TABS, true)) {
            return route('admin.integrations', ['tab' => $check->tab]);
        }

        return match ($check->tab) {
            'hosts' => route('admin.hosts'),
            'plans' => route('admin.plans'),
            'datacenters' => route('admin.datacenters'),
            'mail' => route('admin.mail'),
            'templates' => route('admin.templates'),
            // Company details AND the invoice series both live on
            // Admin\Finance — there is no dedicated "company" page.
            'company' => route('admin.finance'),
            default => route('admin.integrations'),
        };
    }

    public function render()
    {
        return view('livewire.admin.readiness', [
            'groups' => ReadinessRegistry::byGroup(),
            'blockingCount' => count(ReadinessRegistry::blocking()),
            'ready' => ReadinessRegistry::isReady(),
            'mode' => OperatingMode::current(),
            'runnable' => array_keys(self::RUNNABLE),
            'heartbeats' => collect(self::HEARTBEAT_KEYS)
                ->map(fn (string $settingsKey) => $this->heartbeatDisplay($settingsKey))
                ->all(),
        ]);
    }

    /**
     * The heartbeat's own stored moment, in the operator's zone (R19) — or
     * null for "nothing stored" AND for "unreadable", the same forgiving
     * either-way OperationChecks::isFresh() already uses. A readiness page
     * whose only job is to calmly report what is missing must not itself go
     * down over a garbled timestamp (see that method's own docblock for the
     * incident this already caused once, inside Readiness::all() itself).
     */
    private function heartbeatDisplay(string $settingsKey): ?string
    {
        $raw = Settings::get($settingsKey);

        if (blank($raw)) {
            return null;
        }

        try {
            return Carbon::parse($raw)->local()->isoFormat('DD.MM.YYYY HH:mm:ss');
        } catch (\Throwable) {
            return null;
        }
    }
}