<?php

namespace App\Livewire\Admin;

use App\Livewire\Concerns\ConfirmsPassword;
use App\Services\Env\EnvFileEditor;
use App\Services\Env\InvalidEnvContentException;
use App\Services\Secrets\SecretVault;
use App\Support\ProvisioningSettings;
use App\Support\Settings;
use Illuminate\Support\Facades\Auth;
use Illuminate\Support\Facades\Gate;
use Livewire\Attributes\Layout;
use Livewire\Attributes\On;
use Livewire\Component;
use Throwable;

/**
 * Connected services, one page, grouped by what they are for — Zahlungen,
 * DNS, Monitoring, VPN/WireGuard, SSH-Identität — not by which of the two
 * mechanisms below happens to hold a given value.
 *
 * Replaces Admin\Secrets and Admin\Infrastructure, which is what they were:
 * one console area split across two pages by storage mechanism, reported as
 * exactly the wrong axis to split on. An operator setting up an integration
 * should not have to know whether a given field happens to be encrypted.
 *
 * Both mechanisms are unchanged underneath — this is a presentation change,
 * not a data migration:
 *
 * - SecretVault: a curated, encrypted key/value store for credentials that
 *   actually stop the business when they leak or expire. Gated by
 *   `secrets.manage` (Owner only) AND a recently confirmed password — the
 *   realistic threat is an unlocked machine, not a stranger. A stored value
 *   is write-only: the page only ever shows an outline of it.
 * - App\Support\Settings: plain deployment configuration. Gated by
 *   `hosts.manage` (Owner + Admin) alone — none of it opens anything by
 *   itself. Shows its value in full, because there is nothing to protect.
 *
 * mount() is reachable with EITHER capability, because the two halves are no
 * longer two pages an operator's role happens to see one, both, or neither
 * of — they are sections of the SAME page now. Each section, and each save
 * action, still checks its OWN capability (guardSecrets()/guardInfra())
 * server-side; an Admin who can reach this page for the DNS zone still gets
 * 403 the moment they try to touch a vault entry.
 *
 * The .env editor (Part B) shares the secrets lock: it needs `secrets.manage`
 * and the same confirmed password, because it is the one place on this page
 * that can reach every credential the vault deliberately keeps write-only —
 * see EnvFileEditor for the safeguards that make that survivable.
 */
#[Layout('layouts.admin')]
class Integrations extends Component
{
    use ConfirmsPassword {
        forgetPasswordConfirmation as private lockAgain;
    }

    // Vault entries — same shape ConfirmSaveSecret/ConfirmForgetSecret expect
    // and dispatch back into (secret-save-confirmed / secret-forget-confirmed).
    public array $entered = [];

    public ?array $check = null;

    // Plain settings — App\Support\ProvisioningSettings' full list.
    public string $dnsZone = '';

    public string $wgEndpoint = '';

    public string $wgHubPubkey = '';

    public string $traefikDynamicPath = '';

    public string $sshPublicKey = '';

    public string $monitoringUrl = '';

    // .env editor.
    public string $envContent = '';

    /**
     * Loaded lazily, on the first render after unlocking — never in mount(),
     * so a merely-reachable page never pulls the whole credential file into
     * component state for an operator who has not confirmed anything yet.
     */
    public bool $envLoaded = false;

    protected function confirmationGuard(): string
    {
        return 'operator';
    }

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

        if (Gate::allows('hosts.manage')) {
            $this->dnsZone = ProvisioningSettings::dnsZone();
            $this->wgEndpoint = ProvisioningSettings::wgEndpoint();
            $this->wgHubPubkey = ProvisioningSettings::wgHubPublicKey();
            $this->traefikDynamicPath = ProvisioningSettings::traefikDynamicPath();
            $this->sshPublicKey = ProvisioningSettings::sshPublicKey();
            $this->monitoringUrl = ProvisioningSettings::monitoringUrl();
        }
    }

    // ---- Plain settings — App\Support\Settings, hosts.manage, no password. ----

    public function saveInfra(): void
    {
        $this->guardInfra();

        $data = $this->validate([
            'dnsZone' => ['nullable', 'string', 'max:255'],
            'wgEndpoint' => ['nullable', 'string', 'max:255'],
            'wgHubPubkey' => ['nullable', 'string', 'max:255'],
            'traefikDynamicPath' => ['nullable', 'string', 'max:255'],
            'sshPublicKey' => ['nullable', 'string', 'max:1000'],
            'monitoringUrl' => ['nullable', 'url', 'max:255'],
        ]);

        Settings::set('provisioning.dns_zone', trim((string) $data['dnsZone']));
        Settings::set('provisioning.wg_endpoint', trim((string) $data['wgEndpoint']));
        Settings::set('provisioning.wg_hub_pubkey', trim((string) $data['wgHubPubkey']));
        Settings::set('provisioning.traefik_dynamic_path', trim((string) $data['traefikDynamicPath']));
        Settings::set('provisioning.ssh_public_key', trim((string) $data['sshPublicKey']));
        Settings::set('monitoring.api_url', trim((string) $data['monitoringUrl']));

        $this->dispatch('notify', message: __('integrations.settings_saved'));
    }

    // ---- Vault entries — SecretVault, secrets.manage + confirmed password. ----

    public function save(string $key): void
    {
        $this->guardSecrets();

        $field = self::field($key);
        $value = trim((string) ($this->entered[$field] ?? ''));

        if ($value === '') {
            $this->addError('entered.'.$field, __('secrets.empty'));

            return;
        }

        try {
            app(SecretVault::class)->put($key, $value, Auth::guard('operator')->user());
        } catch (Throwable $e) {
            $this->addError('entered.'.$field, $e->getMessage());

            return;
        }

        $this->entered[$field] = '';
        $this->check = null;
        $this->dispatch('notify', message: __('secrets.saved'));
    }

    /** ConfirmSaveSecret dispatches this back (R23) — see that class. */
    #[On('secret-save-confirmed')]
    public function onSaveConfirmed(string $key): void
    {
        $this->save($key);
    }

    public function forget(string $key): void
    {
        $this->guardSecrets();

        app(SecretVault::class)->forget($key);
        $this->check = null;
        $this->dispatch('notify', message: __('secrets.removed'));
    }

    /** ConfirmForgetSecret dispatches this back (R23) — see that class. */
    #[On('secret-forget-confirmed')]
    public function onForgetConfirmed(string $key): void
    {
        $this->forget($key);
    }

    public function test(string $key): void
    {
        $this->guardSecrets();

        $checker = SecretVault::REGISTRY[$key]['check'] ?? null;
        abort_if($checker === null, 404);

        $candidate = trim((string) ($this->entered[self::field($key)] ?? '')) ?: null;
        $this->check = app($checker)->run($candidate);
    }

    /** The dotless form key for a registry key (a dot means nesting to Livewire). */
    public static function field(string $key): string
    {
        return str_replace('.', '_', $key);
    }

    // ---- The .env editor — Part B. secrets.manage + confirmed password. ----

    /**
     * Validate, back up, write. EnvFileEditor does the actual work and the
     * actual refusing; this only translates its one exception into a form
     * error instead of a 500, and reports where the backup landed.
     */
    public function saveEnv(): void
    {
        $this->guardSecrets();

        try {
            $backup = app(EnvFileEditor::class)->write($this->envContent);
        } catch (InvalidEnvContentException $e) {
            $this->addError('envContent', $e->invalidLine !== null
                ? __('integrations.env_invalid', ['line' => $e->invalidLine])
                : __('integrations.env_empty'));

            return;
        }

        // '' means there was no previous file to protect — EnvFileEditor's
        // own docblock explains why that is not an error.
        $this->dispatch('notify', message: __('integrations.env_saved', [
            'backup' => $backup !== '' ? basename($backup) : __('integrations.env_no_previous_file'),
        ]));
    }

    /** ConfirmSaveEnv dispatches this back (R23) — see that class. */
    #[On('env-save-confirmed')]
    public function onEnvSaveConfirmed(): void
    {
        $this->saveEnv();
    }

    /**
     * Overrides ConfirmsPassword's own method (aliased above to lockAgain) to
     * also drop the Stripe check result — the render()-side check just below
     * handles $envContent/$envLoaded, and handles it for BOTH ways a session
     * can end up locked: this explicit click, and the confirmation window
     * simply expiring with nobody clicking anything. A clear here alone would
     * only ever cover the first.
     */
    public function forgetPasswordConfirmation(): void
    {
        $this->lockAgain();

        $this->check = null;
    }

    private function guardInfra(): void
    {
        $this->authorize('hosts.manage');
    }

    /** Capability AND a recently confirmed password, on every vault/.env action. */
    private function guardSecrets(): void
    {
        $this->authorize('secrets.manage');
        abort_unless($this->passwordRecentlyConfirmed(), 403);
    }

    public function render()
    {
        $vault = app(SecretVault::class);
        $canSecrets = Gate::allows('secrets.manage');
        $canInfra = Gate::allows('hosts.manage');
        $unlocked = $this->passwordRecentlyConfirmed();

        // Loaded here rather than in mount(): a page that is merely reachable
        // must not already hold the whole credential file in component state
        // for an operator who has not confirmed a password this session.
        if ($canSecrets && $unlocked && ! $this->envLoaded) {
            $this->envContent = app(EnvFileEditor::class)->read();
            $this->envLoaded = true;
        }

        // The mirror case, and the one forgetPasswordConfirmation() alone
        // does not cover: the confirmation window can also expire on its
        // own, with nobody clicking "Wieder sperren" — $unlocked simply goes
        // false on whatever the next render happens to be. Without this, the
        // textarea disappears from the page but $envContent — the ENTIRE
        // credential file — stays sitting in the component snapshot, reachable
        // to anyone with the browser this was left open on (Codex review,
        // P1). Checked on every render, not only the explicit lock action.
        if (! $unlocked && $this->envLoaded) {
            $this->envContent = '';
            $this->envLoaded = false;
        }

        return view('livewire.admin.integrations', [
            'canSecrets' => $canSecrets,
            'canInfra' => $canInfra,
            'unlocked' => $unlocked,
            'usable' => $vault->isUsable(),
            'entries' => collect(SecretVault::REGISTRY)
                ->map(fn (array $meta, string $key) => [
                    'key' => $key,
                    'field' => self::field($key),
                    'label' => __($meta['label']),
                    'envKey' => $meta['env_key'],
                    'testable' => isset($meta['check']),
                    'source' => $vault->source($key),
                    'outline' => $unlocked ? $vault->outline($key) : null,
                    'updated_at' => $unlocked ? $vault->updatedAt($key) : null,
                    // The SSH identity is a multi-line PEM key: a single-line
                    // password field would mangle it on paste.
                    'multiline' => $key === 'ssh.private_key',
                ])
                ->keyBy('key'),
        ]);
    }
}