<?php
/**
 * Design: colour presets, font choices, CSS variables and
 * loading the front-end CSS/JS only where SiteAuditHub Case Studies output is shown.
 */

if (!defined('ABSPATH')) {
    exit;
}

function sahcs_design_presets() {
    return [
        'modern'    => ['label' => __('Modern (indigo)', 'siteaudithub-case-studies'),  'primary' => '#4F46E5', 'accent' => '#06B6D4', 'heading' => '#111827', 'text' => '#374151', 'bg' => '#FFFFFF', 'card' => '#FFFFFF', 'soft' => '#F5F6FB', 'up' => '#047857', 'down' => '#B42318', 'on' => '#FFFFFF'],
        'minimal'   => ['label' => __('Minimal (mono)', 'siteaudithub-case-studies'),   'primary' => '#111111', 'accent' => '#6B7280', 'heading' => '#111111', 'text' => '#3F3F46', 'bg' => '#FFFFFF', 'card' => '#FFFFFF', 'soft' => '#F5F5F5', 'up' => '#047857', 'down' => '#B42318', 'on' => '#FFFFFF'],
        'bold'      => ['label' => __('Bold (purple & gold)', 'siteaudithub-case-studies'), 'primary' => '#6D28D9', 'accent' => '#F59E0B', 'heading' => '#1F1147', 'text' => '#3B3551', 'bg' => '#FFFFFF', 'card' => '#FFFFFF', 'soft' => '#F6F2FF', 'up' => '#047857', 'down' => '#B42318', 'on' => '#FFFFFF'],
        'corporate' => ['label' => __('Corporate (navy)', 'siteaudithub-case-studies'), 'primary' => '#1E3A8A', 'accent' => '#D4A017', 'heading' => '#0F1B3D', 'text' => '#334155', 'bg' => '#FFFFFF', 'card' => '#FFFFFF', 'soft' => '#F1F5FB', 'up' => '#047857', 'down' => '#B42318', 'on' => '#FFFFFF'],
        'fresh'     => ['label' => __('Fresh (green)', 'siteaudithub-case-studies'),    'primary' => '#065F46', 'accent' => '#2563EB', 'heading' => '#0B2A22', 'text' => '#2B443D', 'bg' => '#FFFFFF', 'card' => '#FFFFFF', 'soft' => '#EEF8F4', 'up' => '#047857', 'down' => '#B42318', 'on' => '#FFFFFF'],
        'dark'      => ['label' => __('Dark', 'siteaudithub-case-studies'),             'primary' => '#818CF8', 'accent' => '#34D399', 'heading' => '#F3F4F6', 'text' => '#C7CBD4', 'bg' => '#0F1117', 'card' => '#171A23', 'soft' => '#1C2030', 'up' => '#34D399', 'down' => '#F87171', 'on' => '#0F1117'],
    ];
}

/**
 * Font choices: the theme's fonts and fonts added through WordPress's
 * Font Library (Appearance → Fonts), plus safe system stacks.
 * SiteAuditHub Case Studies never loads fonts from external servers.
 */
function sahcs_font_choices() {
    $choices = [
        'inherit'      => __('Same as my theme', 'siteaudithub-case-studies'),
        'system-sans'  => __('System sans-serif', 'siteaudithub-case-studies'),
        'system-serif' => __('System serif', 'siteaudithub-case-studies'),
    ];
    if (function_exists('wp_get_global_settings')) {
        $families = wp_get_global_settings(['typography', 'fontFamilies']);
        if (is_array($families)) {
            foreach (['theme', 'custom', 'default'] as $origin) {
                if (empty($families[$origin]) || !is_array($families[$origin])) {
                    continue;
                }
                foreach ($families[$origin] as $f) {
                    if (!empty($f['slug']) && !empty($f['name'])) {
                        $choices['wp:' . sanitize_key($f['slug'])] = $f['name'];
                    }
                }
            }
        }
    }
    return $choices;
}

function sahcs_font_css($choice) {
    switch ($choice) {
        case 'system-sans':
            return "-apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif";
        case 'system-serif':
            return "Georgia, 'Times New Roman', Times, serif";
        case 'inherit':
        case '':
            return 'inherit';
    }
    if (strpos($choice, 'wp:') === 0) {
        return 'var(--wp--preset--font-family--' . sanitize_key(substr($choice, 3)) . ', inherit)';
    }
    return 'inherit';
}

/** Relative luminance (0 = black, 1 = white) of a #rrggbb colour. */
function sahcs_luminance($hex) {
    $hex = ltrim((string) $hex, '#');
    if (strlen($hex) === 3) {
        $hex = $hex[0] . $hex[0] . $hex[1] . $hex[1] . $hex[2] . $hex[2];
    }
    if (!preg_match('/^[0-9a-fA-F]{6}$/', $hex)) {
        return 0.5;
    }
    $c = [];
    foreach ([0, 2, 4] as $i) {
        $v = hexdec(substr($hex, $i, 2)) / 255;
        $c[] = $v <= 0.03928 ? $v / 12.92 : pow(($v + 0.055) / 1.055, 2.4);
    }
    return 0.2126 * $c[0] + 0.7152 * $c[1] + 0.0722 * $c[2];
}

/**
 * Colours for a dark theme background: light text, see-through cards and
 * brand colours brightened enough to read on dark.
 */
function sahcs_dark_surface_vars($s, $p) {
    $bright = function ($color) {
        // Dark or mid colours are mixed with white so text and links stay readable.
        return sahcs_luminance($color) >= 0.28 ? $color : 'color-mix(in srgb,' . $color . ' 62%,#ffffff)';
    };
    $primary = !empty($s['color_primary']) ? $s['color_primary'] : $p['primary'];
    $accent  = !empty($s['color_accent']) ? $s['color_accent'] : $p['accent'];
    return [
        '--sahcs-primary'     => $bright($primary),
        '--sahcs-accent'      => $bright($accent),
        '--sahcs-heading'     => '#F3F4F6',
        '--sahcs-text'        => '#CBD5E1',
        '--sahcs-bg'          => '#0F172A',
        '--sahcs-card'        => 'rgba(255,255,255,.045)',
        '--sahcs-soft'        => 'rgba(255,255,255,.06)',
        '--sahcs-up'          => '#34D399',
        '--sahcs-down'        => '#F87171',
        '--sahcs-on-primary'  => '#0B1220',
        '--sahcs-card-shadow' => '0 12px 32px -16px rgba(0,0,0,.6)',
        '--sahcs-card-border' => '1px solid rgba(255,255,255,.09)',
        'color-scheme'           => 'dark',
    ];
}

/** Builds the CSS custom properties from the saved design settings. */
function sahcs_design_css() {
    $s = sahcs_get_settings();
    $presets = sahcs_design_presets();
    $p = isset($presets[$s['design_preset']]) ? $presets[$s['design_preset']] : $presets['modern'];

    $pick = function ($key, $preset_key) use ($s, $p) {
        return !empty($s[$key]) ? $s[$key] : $p[$preset_key];
    };

    $vars = [
        '--sahcs-primary'  => $pick('color_primary', 'primary'),
        '--sahcs-accent'   => $pick('color_accent', 'accent'),
        '--sahcs-heading'  => $pick('color_heading', 'heading'),
        '--sahcs-text'     => $pick('color_text', 'text'),
        '--sahcs-bg'       => $pick('color_bg', 'bg'),
        '--sahcs-card'     => $pick('color_card', 'card'),
        '--sahcs-soft'     => $p['soft'],
        '--sahcs-up'       => $p['up'],
        '--sahcs-down'     => $p['down'],
        '--sahcs-on-primary' => $p['on'],
        '--sahcs-font-heading' => sahcs_font_css($s['font_heading']),
        '--sahcs-font-body'    => sahcs_font_css($s['font_body']),
        '--sahcs-size'     => (int) $s['base_size'] . 'px',
        // Typography: desktop and phone sizes (unitless px), blended fluidly in between.
        '--sahcs-p-d'      => (int) $s['base_size'],
        '--sahcs-p-m'      => (int) $s['p_size_m'],
        '--sahcs-h1-d'     => (int) $s['h1_size'],
        '--sahcs-h1-m'     => (int) $s['h1_size_m'],
        '--sahcs-h2-d'     => (int) $s['h2_size'],
        '--sahcs-h2-m'     => (int) $s['h2_size_m'],
        '--sahcs-h3-d'     => (int) $s['h3_size'],
        '--sahcs-h3-m'     => (int) $s['h3_size_m'],
        '--sahcs-radius'   => (int) $s['radius'] . 'px',
        '--sahcs-width'    => (int) $s['content_width'] . 'px',
    ];

    $css = '.sahcs-scope{';
    foreach ($vars as $k => $v) {
        $css .= $k . ':' . $v . ';';
    }
    $css .= '}';

    if ($s['card_style'] === 'border') {
        $css .= '.sahcs-scope{--sahcs-card-shadow:none;--sahcs-card-border:1px solid color-mix(in srgb,var(--sahcs-text) 16%,transparent);}';
    } elseif ($s['card_style'] === 'flat') {
        $css .= '.sahcs-scope{--sahcs-card-shadow:none;--sahcs-card-border:0;}';
    }

    // Page background: only painted when chosen (or with the Dark style),
    // otherwise the theme's own background shows through.
    if (!empty($s['color_bg'])) {
        $css .= '.sahcs-single,.sahcs-archive{--sahcs-page-bg:' . $s['color_bg'] . ';}';
    } elseif ($s['design_preset'] === 'dark') {
        $css .= '.sahcs-single,.sahcs-archive{--sahcs-page-bg:' . $p['bg'] . ';}.sahcs-scope{color-scheme:dark;}';
        // Shortcode output placed on a light page gets its own dark panel.
        $css .= '.sahcs-scope:not(.sahcs-single):not(.sahcs-archive):not(.sahcs-single .sahcs-scope):not(.sahcs-archive .sahcs-scope):not(.sahcs-scope .sahcs-scope){background:var(--sahcs-bg);color:var(--sahcs-text);padding:clamp(16px,3vw,28px);border-radius:var(--sahcs-radius);}';
        $css .= '.sahcs-embed__link.sahcs-scope{padding-block:12px;}';
        $css .= '.sahcs-scope .sahcs-cta--gradient .sahcs-button--light{color:' . $p['on'] . ';}';
    }

    // The theme's own background is dark: blend in with it.
    $tone = isset($s['site_tone']) ? $s['site_tone'] : 'auto';
    if ($s['design_preset'] !== 'dark' && $tone !== 'light') {
        $dark = '';
        foreach (sahcs_dark_surface_vars($s, $p) as $k => $v) {
            $dark .= $k . ':' . $v . ';';
        }
        // "auto": front-end script adds .sahcs-tone-dark when the page behind is dark.
        $sel = $tone === 'dark' ? '.sahcs-scope' : '.sahcs-scope.sahcs-tone-dark,.sahcs-tone-dark .sahcs-scope';
        $css .= $sel . '{' . $dark . '}';
        $light_btn = $tone === 'dark' ? '.sahcs-scope .sahcs-cta--gradient .sahcs-button--light' : '.sahcs-tone-dark .sahcs-cta--gradient .sahcs-button--light,.sahcs-tone-dark.sahcs-cta--gradient .sahcs-button--light';
        $css .= $light_btn . '{color:#0B1220;}';
        if ($tone === 'dark') {
            $css .= '.sahcs-single,.sahcs-archive{--sahcs-page-bg:transparent;}';
        }
    }

    // One theme colour: gradients become the main colour (solid).
    if (isset($s['use_gradients']) && !$s['use_gradients']) {
        $css .= '.sahcs-scope,.sahcs-scope.sahcs-tone-dark,.sahcs-tone-dark .sahcs-scope{--sahcs-accent:var(--sahcs-primary);}';
    }
    // No decorative dots and soft shapes.
    if (isset($s['decorations']) && !$s['decorations']) {
        $css .= '.sahcs-scope .sahcs-glance__decor,.sahcs-scope .sahcs-testimonial__mark{display:none}'
            . '.sahcs-scope .sahcs-team__photo-wrap::before,.sahcs-scope .sahcs-team__list::before{content:none;display:none}';
    }

    return $css;
}

add_action('init', function () {
    wp_register_style('sahcs-front', SAHCS_URL . 'assets/css/front.css', [], sahcs_asset_ver('assets/css/front.css'));
    wp_add_inline_style('sahcs-front', sahcs_design_css());
    wp_register_script('sahcs-front', SAHCS_URL . 'assets/js/front.js', [], sahcs_asset_ver('assets/js/front.js'), ['in_footer' => true, 'strategy' => 'defer']);
    $st = sahcs_get_settings();
    wp_localize_script('sahcs-front', 'sahcsFront', [
        'tone' => ($st['design_preset'] !== 'dark' && $st['site_tone'] === 'auto') ? 'auto' : 'fixed',
        'i18n' => [
            'close'    => __('Close', 'siteaudithub-case-studies'),
            'next'     => __('Next image', 'siteaudithub-case-studies'),
            'previous' => __('Previous image', 'siteaudithub-case-studies'),
            'loading'  => __('Loading…', 'siteaudithub-case-studies'),
        ],
    ]);
}, 6);

/**
 * Tiny script printed right after the page wrapper opens, so it runs before
 * the page is painted: it measures a fixed/sticky theme header (so content
 * and the table of contents are never hidden under it) and, when the site
 * background setting is "auto", switches to light text on dark themes.
 */
function sahcs_page_script() {
    $s = sahcs_get_settings();
    $auto = ($s['design_preset'] !== 'dark' && $s['site_tone'] === 'auto') ? 'true' : 'false';
    // Written without "&" on purpose: block themes run wptexturize over the
    // template, which would turn "&&" into "&#038;&#038;" and break the script.
    $js = '(function(w){if(!w)return;if(!w.getBoundingClientRect)return;var d=document,root=d.documentElement,auto=' . $auto . ';'
        . 'function rgb(c){var m=String(c).match(/rgba?\\(([^)]+)\\)/);if(!m)return null;var p=m[1].split(/[\\s,\\/]+/).filter(Boolean).map(parseFloat);if(p.length>3){if(p[3]<0.5)return null;}return p;}'
        . 'function lum(p){var c=[p[0],p[1],p[2]].map(function(v){v/=255;return v<=0.03928?v/12.92:Math.pow((v+0.055)/1.055,2.4);});return 0.2126*c[0]+0.7152*c[1]+0.0722*c[2];}'
        . 'function bg(el){for(;el;el=el.parentElement){if(el.nodeType!==1)break;var cs=getComputedStyle(el),p=rgb(cs.backgroundColor);if(p)return lum(p);var im=cs.backgroundImage;if(im){if(im!=="none"){var a=im.match(/rgba?\\([^)]+\\)/g)||[],t=0,n=0;a.forEach(function(c){var q=rgb(c);if(q){t+=lum(q);n++;}});if(n)return t/n;}}}return 1;}'
        . 'if(auto){var own=rgb(getComputedStyle(w).backgroundColor);if((own?lum(own):bg(w.parentElement))<0.3)w.classList.add("sahcs-tone-dark");}'
        . 'var ab=d.getElementById("wpadminbar"),top=(ab?getComputedStyle(ab).position==="fixed":false)?ab.offsetHeight:0,h=0,fixed=false,el=d.elementFromPoint(window.innerWidth/2,top+1);'
        . 'for(;el;el=el.parentElement){if(el===d.body||el===root)break;var pos=getComputedStyle(el).position;if(pos==="fixed"||pos==="sticky"){var r=el.getBoundingClientRect();if(r.top<=top+1){if(r.height<220){if(r.width>=window.innerWidth*0.6){h=Math.round(r.bottom-top);fixed=pos==="fixed";}}}break;}}'
        . 'root.style.setProperty("--sahcs-header-h",h+"px");'
        . 'if(fixed){var push=Math.ceil(top+h-(w.getBoundingClientRect().top+window.scrollY));if(push>0)w.style.setProperty("--sahcs-push",push+"px");}'
        . '})(document.currentScript?document.currentScript.parentNode:null);';
    // Tell caching / optimisation plugins not to delay or move this tiny script
    // (WP Rocket, LiteSpeed, Autoptimize, SiteGround, Cloudflare Rocket Loader).
    return wp_get_inline_script_tag($js, [
        'data-no-optimize' => '1',
        'data-no-defer'    => '1',
        'data-no-minify'   => '1',
        'data-noptimize'   => '1',
        'data-cfasync'     => 'false',
        'nowprocket'       => true,
    ]);
}

/** Call this whenever SiteAuditHub Case Studies output is printed on a page. */
function sahcs_enqueue_front() {
    wp_enqueue_style('sahcs-front');
    wp_enqueue_script('sahcs-front');
}

/**
 * Whether this page will show SiteAuditHub Case Studies output, so the styles can load in
 * the <head> (no flash of unstyled content). Also true inside page-builder
 * editors and previews, which render shortcodes in the background.
 */
function sahcs_page_needs_assets() {
    if (is_singular(SAHCS_CPT) || is_post_type_archive(SAHCS_CPT) || is_tax(SAHCS_TAX)) {
        return true;
    }
    // Page-builder editors / previews (read-only flags in the address).
    foreach (['elementor-preview', 'et_fb', 'vc_editable', 'fl_builder', 'bricks', 'ct_builder', 'brizy-edit-iframe'] as $flag) {
        if (isset($_GET[$flag])) { // phpcs:ignore WordPress.Security.NonceVerification.Recommended -- only checks that a flag is present
            return true;
        }
    }
    $post = is_singular() ? get_queried_object() : null;
    if ($post instanceof WP_Post) {
        if (strpos((string) $post->post_content, 'siteaudithub-case-studies') !== false) {
            return true; // block or shortcode in the normal content
        }
        // Content saved by page builders in their own fields.
        foreach (['_elementor_data', '_fl_builder_data', '_bricks_page_content_2', 'ct_builder_json'] as $key) {
            $data = get_post_meta($post->ID, $key, true);
            if ($data && strpos(is_string($data) ? $data : (string) wp_json_encode($data), 'siteaudithub-case-studies') !== false) {
                return true;
            }
        }
    }
    /** Force-load the styles (e.g. when a shortcode sits in a header or footer template). */
    return (bool) apply_filters('sahcs_load_assets', false);
}

add_action('wp_enqueue_scripts', function () {
    if (sahcs_page_needs_assets()) {
        sahcs_enqueue_front();
    }
});