<?php

namespace App\Feature\Updates;

use App\Gui\Icons;
use App\Gui\Units;
use App\Model\Connection;
use App\View\Page;

/**
 * The Updates tab of a pool or a server: for each server a line (how many packages, "Reboot required", "Up to date"), under it its
 * packages with the version installed → the new one. The first time it is shown, the servers are asked (as XenCenter checks at
 * start); Check for Updates asks again.
 */
final class UpdatesPage
{
    public static function page(Connection $c, string $ref, string $kind): Page
    {
        $hosts = $kind === 'host' ? [$ref] : array_keys($c->cache->hosts());
        $hosts = array_map('strval', $hosts);
        $master = (string)$c->cache->master();
        usort($hosts, fn ($a, $b) => [$b === $master, $c->cache->name($a)] <=> [$a === $master, $c->cache->name($b)]);
        $rows = [];
        $total = 0;
        $reboots = [];
        foreach ($hosts as $host) {
            $state = Updates::of($c, $host);
            if ($state->packages === null && !$state->checking && $state->error === '' && $c->isConnected()) {
                Updates::check($c, $host);          // never asked: ask now
            }
            $packages = $state->packages ?? [];
            $total += count($packages);
            $reboot = $state->rebootRequired($c, $host);
            if ($reboot) {
                $reboots[] = $host;
            }
            $summary = match (true) {
                $state->installing => 'Installing updates…',
                $state->checking && $state->packages === null => 'Checking for updates…',
                $state->error !== '' => 'Check failed: ' . $state->error,
                $packages === [] && $reboot => 'Up to date · reboot required',
                $packages === [] => $state->packages === null ? 'Not checked yet' : 'Up to date',
                default => count($packages) . (count($packages) === 1 ? ' update' : ' updates') . ($reboot ? ' · reboot required' : '')
                    . (Updates::needsReboot($packages) ? ' (a reboot will be needed)' : ''),
            };
            $h = $c->cache->get($host) ?? [];
            $rows[] = ['id' => $host, 'icon' => Icons::of('host', $h, $c->cache), 'cells' => [(string)($h['name_label'] ?? $host) . ($host === $master ? ' (pool master)' : ''),
                $summary, $reboot ? 'Updated: ' . implode(', ', $state->rebootFor) : '', ''],
                'color' => $state->error !== '' ? '#b42318' : ($reboot ? '#9a6700' : null), 'sort' => [sprintf('%s%04d', $host === $master ? '0' : '1', count($rows))]];
            foreach ($packages as $p) {
                $from = Updates::version($p, 'current_');
                $to = Updates::version($p);
                $note = trim((string)($p['description'] ?? ''));
                $log = is_array($p['changelog'] ?? null) ? trim((string)($p['changelog']['description'] ?? '')) : trim((string)($p['changelog'] ?? ''));
                $rows[] = ['id' => 'update:' . $host . ':' . $p['name'], 'icon' => preg_match(Updates::REBOOT_PACKAGES, $p['name']) ? 'warning' : 'info',
                    'cells' => ['    ' . $p['name'], $from !== '' ? "$from → $to" : "→ $to", $note . ($log !== '' && $log !== $note ? ' — ' . $log : ''),
                        isset($p['size']) ? Units::bytes((float)$p['size']) : ''], 'muted' => false,
                    'sort' => [sprintf('%s%04d', $host === $master ? '0' : '1', count($rows))]];
            }
        }
        $actions = [['id' => 'updates.check', 'text' => 'Check for Updates', 'style' => 'primary']];
        if ($kind === 'host') {
            $actions[] = ['id' => 'updates.install', 'text' => 'Install Updates…', 'enabled' => $total > 0 && !Updates::of($c, $ref)->installing];
            if ($reboots !== []) {
                $actions[] = ['id' => 'host.reboot', 'text' => 'Reboot Now', 'enabled' => $c->cache->vmsOn($ref) === [], 'style' => 'danger'];
            }
        } else {
            $actions[] = ['id' => 'updates.rolling', 'text' => 'Rolling Pool Update…', 'enabled' => $total > 0];
        }
        return Page::grid([['title' => 'Server / package', 'width' => 2.0], ['title' => 'Version (installed → new)', 'width' => 3.0],
            ['title' => 'Description', 'width' => 3.2], ['title' => 'Size', 'width' => 0.8]], $rows, $actions,
            'No server: connect first.');
    }
}