<?php

declare(strict_types=1);

/**
 * Price formatter.
 */
function money(float|int|null $v): string
{
    if ($v === null) {
        return '—';
    }

    return '$' . number_format((float) $v, 2);
}

/**
 * Discount badge class: bigger cut => hotter color.
 */
function cut_class(int $cut): string
{
    return $cut >= 75 ? 'cut-hi' : ($cut >= 50 ? 'cut-mid' : 'cut-lo');
}

/**
 * Deal rating label comparing current price to the all-time low.
 */
function deal_rating(float $hl, float $price): array
{
    $ratio = $price > 0 ? $hl / $price : 0;

    return match (true) {
        $ratio >= 0.99 => ['label' => '🔥 Hot', 'cls' => 'rating-best', 'ratio' => $ratio],
        $ratio >= 0.85 => ['label' => '🔥 Hot', 'cls' => 'rating-great', 'ratio' => $ratio],
        $ratio >= 0.6  => ['label' => 'Good deal', 'cls' => 'rating-good', 'ratio' => $ratio],
        $ratio >= 0.35 => ['label' => 'Fair deal', 'cls' => 'rating-fair', 'ratio' => $ratio],
        default        => ['label' => 'High price', 'cls' => 'rating-high', 'ratio' => $ratio],
    };
}

/**
 * Build a URL like the current one with query params overridden.
 */
function qs_url(array $overrides = [], array $remove = []): string
{
    $get = service('request')->getGet();
    $get = array_map(static fn ($v) => is_array($v) ? array_values(array_filter($v, 'strlen')) : $v, $get);

    foreach ($remove as $key) {
        unset($get[$key]);
    }

    $get = array_merge($get, $overrides);
    // drop empty / zero-default params for clean URLs
    foreach ($get as $key => $val) {
        if (is_array($val)) {
            if ($val === []) unset($get[$key]);
            continue;
        }
        if ($key === 'min_cut' && (int) $val === 0) { unset($get[$key]); continue; }
        if ($key === 'kind' && $val === '') { unset($get[$key]); continue; }
        if ($key === 'page' && ($val === null || (int) $val === 1)) { unset($get[$key]); continue; }
        if (($key === 'min_price' || $key === 'max_price' || $key === 'q') && $val === '') { unset($get[$key]); continue; }
    }

    $qs = http_build_query($get);

    // keep the current path (e.g. /games/rpg) so filters stay within it
    $path = '/' . ltrim(uri_string(), '/');

    return $path . ($qs !== '' ? '?' . $qs : '');
}

function store_initials(string $name): string
{
    $words = preg_split('/\s+/', $name) ?: [];
    $ini = '';
    foreach ($words as $w) {
        if ($w === '' || ! ctype_alpha($w[0])) {
            continue;
        }
        $ini .= strtoupper($w[0]);
        if (strlen($ini) >= 2) {
            break;
        }
    }

    return $ini !== '' ? $ini : strtoupper(substr($name, 0, 2));
}

function time_ago(int|string|MongoDB\BSON\UTCDateTime $ts): string
{
    if ($ts instanceof MongoDB\BSON\UTCDateTime) {
        $ts = $ts->toDateTime()->getTimestamp();
    }
    $diff = max(1, time() - (int) $ts);
    if ($diff < 3600)     return floor($diff / 60) . ' min ago';
    if ($diff < 86400)    return floor($diff / 3600) . ' h ago';
    if ($diff < 86400*30) return floor($diff / 86400) . ' days ago';
    if ($diff < 86400*365) return floor($diff / (86400*30)) . ' months ago';
    return floor($diff / (86400*365)) . ' y ago';
}

function bson_date($ts): ?string
{
    if (! $ts instanceof MongoDB\BSON\UTCDateTime) {
        return null;
    }
    return date('M j, Y', $ts->toDateTime()->getTimestamp());
}