<?php
declare(strict_types=1);

define('CONTROL_API_LIBRARY', true);
require_once __DIR__ . '/../public/api.php';

function touch_panel_io_counters(): array
{
    $reads = 0;
    $writes = 0;
    foreach (@file('/proc/diskstats', FILE_IGNORE_NEW_LINES) ?: [] as $line) {
        $parts = preg_split('/\s+/', trim($line));
        if (count($parts) < 14) {
            continue;
        }
        $name = (string)$parts[2];
        if (preg_match('/^(loop|ram|zram|dm-)/', $name)) {
            continue;
        }
        $reads += (int)$parts[3];
        $writes += (int)$parts[7];
    }

    return [
        'reads' => $reads,
        'writes' => $writes,
    ];
}

function touch_panel_snapshot(array $snapshot): array
{
    $network = is_array($snapshot['network'] ?? null) ? $snapshot['network'] : [];
    $wifi = is_array($snapshot['wifi'] ?? null) ? $snapshot['wifi'] : [];
    $system = is_array($snapshot['system'] ?? null) ? $snapshot['system'] : [];
    $fan = is_array($snapshot['fan'] ?? null) ? $snapshot['fan'] : [];
    $touch = is_array($snapshot['touch_display'] ?? null) ? $snapshot['touch_display'] : [];

    $interfaces = [];
    foreach (($network['interfaces'] ?? []) as $row) {
        if (!is_array($row) || !isset($row['name'])) {
            continue;
        }
        $interfaces[] = [
            'name' => $row['name'],
            'state' => $row['state'] ?? null,
            'carrier' => $row['carrier'] ?? null,
            'rx_errors' => $row['rx_errors'] ?? 0,
            'tx_errors' => $row['tx_errors'] ?? 0,
            'rx_dropped' => $row['rx_dropped'] ?? 0,
            'tx_dropped' => $row['tx_dropped'] ?? 0,
            'rx_bytes' => $row['rx_bytes'] ?? 0,
            'tx_bytes' => $row['tx_bytes'] ?? 0,
            'rx_packets' => $row['rx_packets'] ?? 0,
            'tx_packets' => $row['tx_packets'] ?? 0,
        ];
    }

    $clients = [];
    foreach (($wifi['clients'] ?? []) as $client) {
        if (!is_array($client)) {
            continue;
        }
        $clients[] = [
            'band' => $client['band'] ?? null,
        ];
    }

    return [
        'ok' => (bool)($snapshot['ok'] ?? true),
        'generated_at' => $snapshot['generated_at'] ?? null,
        'fan' => [
            'mode' => $fan['mode'] ?? 'auto',
            'pwm' => $fan['pwm'] ?? 0,
            'percent' => $fan['percent'] ?? 0,
            'rpm' => $fan['rpm'] ?? 0,
            'control_temp_c' => $fan['control_temp_c'] ?? null,
            'policy_ok' => $fan['policy_ok'] ?? true,
        ],
        'system' => [
            'hostname' => $system['hostname'] ?? null,
            'temp_c' => $system['temp_c'] ?? null,
        ],
        'network' => [
            'default_interface' => $network['default_interface'] ?? null,
            'interfaces' => $interfaces,
        ],
        'wifi' => [
            'clients' => $clients,
        ],
        'touch_display' => [
            'connected' => $touch['connected'] ?? false,
        ],
        'io' => touch_panel_io_counters(),
        'history' => array_map(static function (array $row): array {
            return [
                'time' => $row['time'] ?? null,
                'temp_c' => $row['temp_c'] ?? null,
                'fan_rpm' => $row['fan_rpm'] ?? null,
                'fan_pwm' => $row['fan_pwm'] ?? null,
                'cpu_load_1' => $row['cpu_load_1'] ?? null,
                'mem_percent' => $row['mem_percent'] ?? null,
            ];
        }, array_slice(array_values(array_filter($snapshot['history'] ?? [], 'is_array')), -80)),
        'network_history' => array_map(static function (array $row): array {
            return [
                'time' => $row['time'] ?? null,
                'iface' => $row['iface'] ?? null,
                'rx_mbps' => $row['rx_mbps'] ?? 0,
                'tx_mbps' => $row['tx_mbps'] ?? 0,
                'rx_pps' => $row['rx_pps'] ?? 0,
                'tx_pps' => $row['tx_pps'] ?? 0,
            ];
        }, array_slice(array_values(array_filter($snapshot['network_history'] ?? [], 'is_array')), -240)),
    ];
}

function touch_panel_json(array $payload, int $code = 0): never
{
    fwrite(STDOUT, json_encode($payload, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES) . PHP_EOL);
    exit($code);
}

try {
    $command = (string)($argv[1] ?? 'status');

    if ($command === 'status') {
        touch_panel_json([
            'ok' => true,
            'data' => touch_panel_snapshot(collect_snapshot(false)),
        ]);
    }

    if ($command === 'fan') {
        $mode = (string)($argv[2] ?? 'auto');
        $pwm = max(0, min(255, (int)($argv[3] ?? 120)));
        if (!in_array($mode, ['auto', 'manual', 'off'], true)) {
            touch_panel_json([
                'ok' => false,
                'error' => 'bad_mode',
            ], 2);
        }

        set_control_state($mode, $pwm);
        add_fan_action(
            'touch_panel_fan_set',
            $mode,
            $pwm,
            'qt touch panel fan control',
            true
        );

        touch_panel_json([
            'ok' => true,
            'data' => touch_panel_snapshot(collect_snapshot(false)),
        ]);
    }

    touch_panel_json([
        'ok' => false,
        'error' => 'unknown_command',
    ], 2);
} catch (Throwable $e) {
    touch_panel_json([
        'ok' => false,
        'error' => 'exception',
        'message' => $e->getMessage(),
    ], 1);
}