<?php
// Serve the active theme CSS with colour overrides appended
require_once __DIR__ . '/config.php';

if (!IS_INSTALLED) {
    header('Content-Type: text/css; charset=UTF-8');
    header('Cache-Control: no-store');
    readfile(__DIR__ . '/assets/css/os2.css');
    exit;
}

require_once ROOT_PATH . '/includes/db.php';
require_once ROOT_PATH . '/includes/functions.php';

$theme = get_active_theme();
$css   = $theme ? $theme['css_content'] : @file_get_contents(__DIR__ . '/assets/css/os2.css');

// Build colour overrides — these are APPENDED after the theme CSS so they win over
// any :root {} block already present in the theme file.
$colorMap = [
    '--desktop-bg'       => ['key' => 'color_desktop_bg',    'default' => '#1A0A2E'],
    '--window-bg'        => ['key' => 'color_window_bg',     'default' => '#C8C4D0'],
    '--titlebar-bg'      => ['key' => 'color_titlebar_bg',   'default' => '#5B2D8E'],
    '--titlebar-bg-end'  => ['key' => 'color_titlebar_bg_end','default' => '#2D1B6B'],
    '--titlebar-text'    => ['key' => 'color_titlebar_text', 'default' => '#FFFFFF'],
    '--text-color'       => ['key' => 'color_text',          'default' => '#000000'],
    '--link-color'       => ['key' => 'color_link',          'default' => '#4A007A'],
    '--accent-color'     => ['key' => 'color_accent',        'default' => '#5B2D8E'],
    '--content-bg'       => ['key' => 'color_content_bg',    'default' => '#FFFFFF'],
    '--footer-bg'        => ['key' => 'color_footer_bg',     'default' => '#9888B0'],
];

$overrides = ":root {\n";
foreach ($colorMap as $var => $cfg) {
    $val = get_setting($cfg['key'], $cfg['default']);
    $val = preg_replace('/[^a-zA-Z0-9#(),.\s%+-]/', '', $val);
    $overrides .= "  {$var}: {$val};\n";
}
$overrides .= "}\n";

// Cache-bust via the theme's updated_at timestamp so browsers always get
// fresh CSS after a theme save, while still caching between saves.
$etag = $theme ? md5($theme['updated_at'] . $overrides) : md5($overrides);
$clientEtag = $_SERVER['HTTP_IF_NONE_MATCH'] ?? '';
if ($clientEtag === '"' . $etag . '"') {
    http_response_code(304);
    exit;
}

header('Content-Type: text/css; charset=UTF-8');
header('Cache-Control: public, max-age=60, must-revalidate');
header('ETag: "' . $etag . '"');

// Readability fixes — appended after theme CSS so they override any hardcoded values
// in older or custom themes. These use CSS variables so they adapt to each palette.
$fixes = "\n/* ── Readability fixes (always applied, override theme CSS) ── */\n";
$fixes .= ".hero-desc { color: var(--titlebar-text) !important; opacity: 0.9; }\n";
$fixes .= ".win-titlebar a, .section-titlebar a { color: var(--titlebar-text) !important; }\n";
$fixes .= ".win-titlebar a:hover, .section-titlebar a:hover { color: var(--titlebar-text) !important; }\n";

// CSS comes first, overrides appended last — last :root {} declaration wins
echo $css . "\n\n/* ── Palette overrides (from Settings → Colour Palette) ── */\n" . $overrides . $fixes;