<?php
/**
 * Plugin settings: defaults, reading and sanitising.
 * Everything is stored in one option: sahcs_settings.
 */

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

/** trim() with the same characters on every PHP version. */
function sahcs_trim($text) {
    return trim((string) $text, " \t\n\r\0\x0B\f");
}

function sahcs_default_settings() {
    return [
        // URLs
        'archive_slug'   => 'case-studies',
        'category_base'  => 'category',
        'url_mode'       => 'base', // base = /case-studies/slug/, root = /slug/

        // Listing page
        'archive_title'  => 'Case Studies',
        'archive_intro'  => '',
        'per_page'       => 9,
        'columns'        => 3,
        'archive_layout' => 'grid', // grid | list
        'show_filters'   => 1,

        // Single case study
        'toc_enabled'    => 1,
        'toc_title'      => 'On this page',
        'toc_depth'      => 'h2h3',
        'toc_min'        => 3,
        'related_count'  => 3,
        'related_layout' => 'grid', // grid | list
        'show_author'    => 1,
        'author_label'   => 'Written by',

        // Default call to action
        'cta_heading'    => 'Want results like these?',
        'cta_text'       => 'Tell us about your project and we will get back to you within one business day.',
        'cta_button'     => 'Get in touch',
        'cta_url'        => '',
        'cta_new_tab'    => 0,
        'cta_nofollow'   => 0,

        // Design
        'design_preset'  => 'modern',
        'site_tone'      => 'auto', // auto | light | dark - the theme's own page background
        'color_primary'  => '',
        'color_accent'   => '',
        'color_heading'  => '',
        'color_text'     => '',
        'color_bg'       => '',
        'color_card'     => '',
        'font_heading'   => 'inherit',
        'font_body'      => 'inherit',
        'base_size'      => 17,  // paragraph size on desktop
        'p_size_m'       => 16,  // paragraph size on phones
        'h1_size'        => 37,
        'h1_size_m'      => 28,
        'h2_size'        => 30,
        'h2_size_m'      => 24,
        'h3_size'        => 21,
        'h3_size_m'      => 19,
        'use_gradients'  => 1,
        'icon_colors'    => 'brand', // brand (theme colour) | mixed (colourful)
        'decorations'    => 1,
        'radius'         => 14,
        'content_width'  => 1140,
        'card_style'     => 'shadow', // shadow | border | flat
    ];
}

/**
 * Returns all settings (or one key), merged with defaults.
 */
function sahcs_get_settings($key = null) {
    static $cache = null;
    if ($cache === null) {
        $cache = sahcs_fresh_settings();
    }
    // Translated texts (Polylang) are looked up each time, because the
    // page language is only known after the settings are first read.
    $settings = function_exists('sahcs_translate_settings') ? sahcs_translate_settings($cache) : $cache;
    if ($key === null) {
        return $settings;
    }
    return isset($settings[$key]) ? $settings[$key] : null;
}

/** Same as sahcs_get_settings() but always re-reads from the database. */
function sahcs_fresh_settings() {
    $saved = get_option('sahcs_settings', []);
    return array_merge(sahcs_default_settings(), is_array($saved) ? $saved : []);
}

function sahcs_sanitize_hex($value) {
    $value = sahcs_trim((string) $value);
    if ($value === '') {
        return '';
    }
    $hex = sanitize_hex_color($value);
    return $hex ? $hex : '';
}

function sahcs_sanitize_slug($value, $fallback) {
    $parts = array_filter(array_map('sanitize_title', explode('/', (string) $value)));
    $slug = implode('/', $parts);
    return $slug !== '' ? $slug : $fallback;
}

/**
 * Sanitises the whole settings array coming from the settings form.
 * Only the keys present in the submitted tab are changed; the rest keep
 * their saved values.
 */
function sahcs_sanitize_settings($input) {
    $current  = sahcs_fresh_settings();
    $defaults = sahcs_default_settings();
    $input    = is_array($input) ? $input : [];
    $out      = $current;

    $tab = isset($input['_tab']) ? sanitize_key($input['_tab']) : '';
    // WordPress may run this callback a second time on the already-cleaned
    // array (no "_tab" key). Then every value is checked again instead of
    // falling back to the old saved settings.
    if ($tab !== '') {
        $tabs = [$tab];
    } elseif (isset($input['archive_slug'], $input['design_preset'])) {
        $tabs = ['general', 'design'];
    } else {
        $tabs = [];
    }

    if (in_array('general', $tabs, true)) {
        $out['archive_slug']  = sahcs_sanitize_slug(isset($input['archive_slug']) ? $input['archive_slug'] : '', $defaults['archive_slug']);
        $out['category_base'] = sahcs_sanitize_slug(isset($input['category_base']) ? $input['category_base'] : '', $defaults['category_base']);
        $out['url_mode']      = (isset($input['url_mode']) && $input['url_mode'] === 'root') ? 'root' : 'base';
        $out['archive_title'] = sanitize_text_field(isset($input['archive_title']) ? $input['archive_title'] : '');
        $out['archive_intro'] = sanitize_textarea_field(isset($input['archive_intro']) ? $input['archive_intro'] : '');
        $out['per_page']      = max(1, min(60, absint(isset($input['per_page']) ? $input['per_page'] : 9)));
        $out['columns']       = max(1, min(4, absint(isset($input['columns']) ? $input['columns'] : 3)));
        $out['archive_layout'] = (isset($input['archive_layout']) && $input['archive_layout'] === 'list') ? 'list' : 'grid';
        $out['show_filters']  = empty($input['show_filters']) ? 0 : 1;
        $out['toc_enabled']   = empty($input['toc_enabled']) ? 0 : 1;
        $out['toc_title']     = sanitize_text_field(isset($input['toc_title']) ? $input['toc_title'] : '');
        $out['toc_depth']     = (isset($input['toc_depth']) && $input['toc_depth'] === 'h2') ? 'h2' : 'h2h3';
        $out['toc_min']       = max(1, min(10, absint(isset($input['toc_min']) ? $input['toc_min'] : 3)));
        $out['related_count'] = max(0, min(12, absint(isset($input['related_count']) ? $input['related_count'] : 3)));
        $out['related_layout'] = (isset($input['related_layout']) && $input['related_layout'] === 'list') ? 'list' : 'grid';
        $out['show_author']   = empty($input['show_author']) ? 0 : 1;
        $out['author_label']  = sanitize_text_field(isset($input['author_label']) ? $input['author_label'] : '');
        $out['cta_heading']   = sanitize_text_field(isset($input['cta_heading']) ? $input['cta_heading'] : '');
        $out['cta_text']      = sanitize_textarea_field(isset($input['cta_text']) ? $input['cta_text'] : '');
        $out['cta_button']    = sanitize_text_field(isset($input['cta_button']) ? $input['cta_button'] : '');
        $out['cta_url']       = esc_url_raw(isset($input['cta_url']) ? $input['cta_url'] : '');
        $out['cta_new_tab']   = empty($input['cta_new_tab']) ? 0 : 1;
        $out['cta_nofollow']  = empty($input['cta_nofollow']) ? 0 : 1;

        // The two slugs must differ or category pages would swallow case studies.
        if ($out['category_base'] === $out['archive_slug']) {
            $out['category_base'] = $defaults['category_base'];
        }
    }

    if (in_array('design', $tabs, true)) {
        $presets = array_keys(sahcs_design_presets());
        $out['design_preset'] = (isset($input['design_preset']) && in_array($input['design_preset'], $presets, true)) ? $input['design_preset'] : 'modern';
        $out['site_tone']     = (isset($input['site_tone']) && in_array($input['site_tone'], ['auto', 'light', 'dark'], true)) ? $input['site_tone'] : 'auto';
        foreach (['color_primary', 'color_accent', 'color_heading', 'color_text', 'color_bg', 'color_card'] as $k) {
            $out[$k] = sahcs_sanitize_hex(isset($input[$k]) ? $input[$k] : '');
        }
        $fonts = array_keys(sahcs_font_choices());
        foreach (['font_heading', 'font_body'] as $k) {
            $val = isset($input[$k]) ? sanitize_text_field(wp_unslash($input[$k])) : 'inherit';
            $out[$k] = in_array($val, $fonts, true) ? $val : 'inherit';
        }
        $out['base_size']     = max(14, min(22, absint(isset($input['base_size']) ? $input['base_size'] : 17)));
        $sizes = ['p_size_m' => [13, 22, 16], 'h1_size' => [24, 72, 37], 'h1_size_m' => [20, 56, 28], 'h2_size' => [18, 56, 30], 'h2_size_m' => [16, 44, 24], 'h3_size' => [14, 40, 21], 'h3_size_m' => [13, 32, 19]];
        foreach ($sizes as $k => $r) {
            $out[$k] = isset($input[$k]) && $input[$k] !== '' ? max($r[0], min($r[1], absint($input[$k]))) : $r[2];
        }
        $out['use_gradients'] = empty($input['use_gradients']) ? 0 : 1;
        $out['icon_colors']   = (isset($input['icon_colors']) && $input['icon_colors'] === 'mixed') ? 'mixed' : 'brand';
        $out['decorations']   = empty($input['decorations']) ? 0 : 1;
        $out['radius']        = max(0, min(32, absint(isset($input['radius']) ? $input['radius'] : 14)));
        $out['content_width'] = max(720, min(1600, absint(isset($input['content_width']) ? $input['content_width'] : 1140)));
        $out['card_style']    = (isset($input['card_style']) && in_array($input['card_style'], ['shadow', 'border', 'flat'], true)) ? $input['card_style'] : 'shadow';
    }

    unset($out['_tab']);
    return $out;
}

/** Flush permalinks on the next request after URL settings change. */
add_action('update_option_sahcs_settings', function ($old, $new) {
    $keys = ['archive_slug', 'category_base', 'url_mode'];
    foreach ($keys as $k) {
        if (!isset($old[$k]) || !isset($new[$k]) || $old[$k] !== $new[$k]) {
            update_option('sahcs_flush_rewrite', 1, false);
            break;
        }
    }
}, 10, 2);

add_action('init', function () {
    if (get_option('sahcs_flush_rewrite')) {
        delete_option('sahcs_flush_rewrite');
        flush_rewrite_rules(false);
    }
}, 99);