<?php
namespace Zadex;

defined('ABSPATH') || exit;

/**
 * Site-wide settings: breakpoints, enabled post types, global design settings and the generated global CSS.
 *
 * Options:
 *  - zadex_settings   : plugin options (post types, feature flags, breakpoints)
 *  - zadex_global     : design settings edited in the editor (colors, fonts, spacing, classes, themeStyle, layout,
 *                       site = maintenance / coming soon mode, floatingButtons; see includes/Site/)
 *  - zadex_global_css : CSS generated by the editor for the global settings
 */
final class Settings
{
    public const OPTION = 'zadex_settings';
    public const OPTION_GLOBAL = 'zadex_global';
    public const OPTION_GLOBAL_CSS = 'zadex_global_css';

    /** Ordered from smallest to largest. `desktop` is the base (no media query). */
    public static function default_breakpoints(): array
    {
        return [
            'mobile'       => ['label' => 'Mobile',       'value' => 767,  'direction' => 'max',  'enabled' => true,  'icon' => 'smartphone'],
            'mobile_large' => ['label' => 'Mobile Large', 'value' => 880,  'direction' => 'max',  'enabled' => false, 'icon' => 'smartphone-large'],
            'tablet'       => ['label' => 'Tablet',       'value' => 1024, 'direction' => 'max',  'enabled' => true,  'icon' => 'tablet'],
            'tablet_large' => ['label' => 'Tablet Large', 'value' => 1200, 'direction' => 'max',  'enabled' => false, 'icon' => 'tablet-large'],
            'laptop'       => ['label' => 'Laptop',       'value' => 1366, 'direction' => 'max',  'enabled' => false, 'icon' => 'laptop'],
            'desktop'      => ['label' => 'Desktop',      'value' => 0,    'direction' => 'base', 'enabled' => true,  'icon' => 'monitor'],
            'widescreen'   => ['label' => 'Widescreen',   'value' => 2400, 'direction' => 'min',  'enabled' => false, 'icon' => 'tv'],
        ];
    }

    public static function defaults(): array
    {
        return [
            'post_types'  => ['post', 'page'],
            'breakpoints' => self::default_breakpoints(),
            'features'    => [
                'dark_mode_default' => false,
                'autosave_interval' => 60,
            ],
            // Google reCAPTCHA keys for the Form widget (v2 checkbox or v3). The secret never leaves the server.
            'recaptcha_site_key' => '',
            'recaptcha_secret'   => '',
            // Stripe secret key for the Stripe button's Checkout mode (T193). Server-side only, never printed.
            'stripe_secret_key'  => '',
        ];
    }

    /** reCAPTCHA keys (Form widget). @return array{site_key: string, secret: string} */
    public function recaptcha(): array
    {
        return [
            'site_key' => trim((string) $this->get('recaptcha_site_key', '')),
            'secret'   => trim((string) $this->get('recaptcha_secret', '')),
        ];
    }

    public static function default_global(): array
    {
        return [
            'colors' => [
                ['id' => 'primary',   'label' => 'Primary',   'value' => '#2563eb'],
                ['id' => 'secondary', 'label' => 'Secondary', 'value' => '#0f172a'],
                ['id' => 'text',      'label' => 'Text',      'value' => '#334155'],
                ['id' => 'accent',    'label' => 'Accent',    'value' => '#f59e0b'],
            ],
            'fonts' => [
                ['id' => 'primary',   'label' => 'Primary',   'value' => ['family' => 'Inter', 'weight' => '600']],
                ['id' => 'secondary', 'label' => 'Secondary', 'value' => ['family' => 'Inter', 'weight' => '400']],
                ['id' => 'text',      'label' => 'Text',      'value' => ['family' => 'Inter', 'weight' => '400']],
            ],
            'spacing' => [
                ['id' => 'xs', 'label' => 'XS', 'value' => ['size' => 4,  'unit' => 'px']],
                ['id' => 'sm', 'label' => 'SM', 'value' => ['size' => 8,  'unit' => 'px']],
                ['id' => 'md', 'label' => 'MD', 'value' => ['size' => 16, 'unit' => 'px']],
                ['id' => 'lg', 'label' => 'LG', 'value' => ['size' => 32, 'unit' => 'px']],
                ['id' => 'xl', 'label' => 'XL', 'value' => ['size' => 64, 'unit' => 'px']],
            ],
            'classes'    => [],
            'themeStyle' => [],
            'layout'     => ['contentWidth' => ['size' => 1140, 'unit' => 'px'], 'gap' => ['size' => 20, 'unit' => 'px']],
        ];
    }

    public static function ensure_defaults(): void
    {
        if (get_option(self::OPTION) === false) {
            add_option(self::OPTION, self::defaults());
        }
        if (get_option(self::OPTION_GLOBAL) === false) {
            add_option(self::OPTION_GLOBAL, self::default_global());
        }
        $saved_css = get_option(self::OPTION_GLOBAL_CSS);
        if ($saved_css === false || $saved_css === '') {
            $default_vars = self::build_default_vars(self::default_global());
            if ($saved_css === false) {
                add_option(self::OPTION_GLOBAL_CSS, $default_vars);
            } else {
                update_option(self::OPTION_GLOBAL_CSS, $default_vars);
            }
        }
    }

    public function get(string $key, $default = null)
    {
        $all = wp_parse_args((array) get_option(self::OPTION, []), self::defaults());
        return $all[$key] ?? $default;
    }

    public function update(array $values): void
    {
        $all = wp_parse_args((array) get_option(self::OPTION, []), self::defaults());
        update_option(self::OPTION, array_merge($all, $values));
    }

    public function breakpoints(): array
    {
        $saved = (array) $this->get('breakpoints', []);
        $out = [];
        foreach (self::default_breakpoints() as $key => $bp) {
            $out[$key] = array_merge($bp, isset($saved[$key]) && is_array($saved[$key]) ? $saved[$key] : []);
            $out[$key]['value'] = (int) $out[$key]['value'];
            $out[$key]['enabled'] = $key === 'desktop' ? true : (bool) $out[$key]['enabled'];
        }
        return $out;
    }

    public function post_types(): array
    {
        return array_values(array_filter((array) $this->get('post_types', ['post', 'page']), 'post_type_exists'));
    }

    public function global(): array
    {
        $global = wp_parse_args((array) get_option(self::OPTION_GLOBAL, []), self::default_global());
        unset($global['customCss']); // Removed feature (arbitrary site-wide CSS): old values are ignored.
        return $global;
    }

    public function update_global(array $settings, ?string $css = null): void
    {
        // Site features (T102/T103) get strict shapes instead of the generic sanitizer's.
        if (array_key_exists('site', $settings)) {
            $settings['site'] = \Zadex\Site\MaintenanceMode::sanitize($settings['site']);
        }
        if (array_key_exists('floatingButtons', $settings)) {
            $settings['floatingButtons'] = \Zadex\Site\FloatingButtons::sanitize($settings['floatingButtons']);
        }
        if (array_key_exists('pageTransitions', $settings)) {
            $settings['pageTransitions'] = \Zadex\Site\PageTransitions::sanitize($settings['pageTransitions']);
        }
        unset($settings['customCss']); // Arbitrary site-wide CSS is not supported.
        update_option(self::OPTION_GLOBAL, $settings);
        if ($css !== null) {
            update_option(self::OPTION_GLOBAL_CSS, $css);
        }
    }

    public function global_css(): string
    {
        $saved = (string) get_option(self::OPTION_GLOBAL_CSS, '');
        if ($saved !== '') {
            return self::strip_legacy_custom_css($saved, get_option(self::OPTION_GLOBAL, []));
        }
        return self::build_default_vars($this->global());
    }

    /**
     * Older versions let admins type site-wide custom CSS (`zadex_global.customCss`) that the editor appended to the
     * end of the generated global CSS. That feature is removed: until the global settings are saved again (which
     * regenerates the CSS without it), the stored tail is cut off so old custom CSS is never printed.
     *
     * @param mixed $global The raw `zadex_global` option.
     */
    public static function strip_legacy_custom_css(string $css, $global): string
    {
        $custom = is_array($global) && isset($global['customCss']) && is_string($global['customCss']) ? trim($global['customCss']) : '';
        if ($custom === '') {
            return $css;
        }
        $trimmed = rtrim($css);
        foreach ([$custom, trim(\Zadex\Documents\Document::sanitize_css($custom))] as $tail) {
            if ($tail !== '' && str_ends_with($trimmed, $tail)) {
                return rtrim(substr($trimmed, 0, -strlen($tail)));
            }
        }
        return $css;
    }

    /**
     * Builds default CSS custom properties from global settings so that variables
     * like --zx-color-* and --zx-font-* exist even before the user visits Site Settings in the editor.
     */
    public static function build_default_vars(array $global): string
    {
        $vars = [];
        foreach ($global['colors'] ?? [] as $c) {
            if (!empty($c['id']) && isset($c['value']) && is_string($c['value']) && $c['value'] !== '') {
                $vars[] = '--zx-color-' . preg_replace('/[^a-zA-Z0-9_\-]/', '', (string) $c['id']) . ':' . sanitize_text_field($c['value']);
            }
        }
        foreach ($global['fonts'] ?? [] as $f) {
            if (!empty($f['id']) && !empty($f['value']['family']) && is_string($f['value']['family'])) {
                $family = trim($f['value']['family']);
                if (!str_contains($family, ',') && !str_starts_with($family, '"') && !str_starts_with($family, "'") && preg_match('/\s/', $family)) {
                    $family = '"' . $family . '"';
                }
                $vars[] = '--zx-font-' . preg_replace('/[^a-zA-Z0-9_\-]/', '', (string) $f['id']) . ':' . $family;
            }
            if (!empty($f['id']) && !empty($f['value']['weight'])) {
                $vars[] = '--zx-font-' . preg_replace('/[^a-zA-Z0-9_\-]/', '', (string) $f['id']) . '-weight:' . sanitize_text_field((string) $f['value']['weight']);
            }
        }
        foreach ($global['spacing'] ?? [] as $s) {
            if (!empty($s['id']) && isset($s['value'])) {
                $css = self::slider_to_css($s['value']);
                if ($css !== null) {
                    $vars[] = '--zx-space-' . preg_replace('/[^a-zA-Z0-9_\-]/', '', (string) $s['id']) . ':' . $css;
                }
            }
        }
        if (isset($global['layout']['contentWidth'])) {
            $cw = self::slider_to_css($global['layout']['contentWidth']);
            if ($cw !== null) {
                $vars[] = '--zx-content-width:' . $cw;
            }
        }
        if (isset($global['layout']['gap'])) {
            $gap = self::slider_to_css($global['layout']['gap']);
            if ($gap !== null) {
                $vars[] = '--zx-gap:' . $gap;
            }
        }
        if (isset($global['layout']['containerPadding'])) {
            $cp = self::dimensions_to_css($global['layout']['containerPadding']);
            if ($cp !== null) {
                $vars[] = '--zx-container-padding:' . $cp;
            }
        }
        $lb = $global['layout']['lightbox'] ?? null;
        if (is_array($lb)) {
            if (!empty($lb['bg'])) $vars[] = '--zx-lightbox-bg:' . sanitize_text_field($lb['bg']);
            if (!empty($lb['color'])) $vars[] = '--zx-lightbox-color:' . sanitize_text_field($lb['color']);
            if (isset($lb['counter']) && $lb['counter'] === false) $vars[] = '--zx-lightbox-counter:none';
            if (isset($lb['captions']) && $lb['captions'] === false) $vars[] = '--zx-lightbox-caption:none';
            if (isset($lb['zoom']) && $lb['zoom'] === false) $vars[] = '--zx-lightbox-zoom:default';
        }

        if (empty($vars)) {
            return '';
        }
        return ':root{' . implode(';', $vars) . '}';
    }

    private static function slider_to_css($value): ?string
    {
        if (is_numeric($value)) {
            return $value . 'px';
        }
        if (is_string($value)) {
            $trimmed = trim($value);
            return $trimmed === '' ? null : $trimmed;
        }
        if (is_array($value) && isset($value['size']) && $value['size'] !== '' && $value['size'] !== null) {
            $unit = $value['unit'] ?? 'px';
            if ($unit === 'custom') {
                return (string) $value['size'];
            }
            if (is_numeric($value['size'])) {
                return (float) $value['size'] . preg_replace('/[^a-zA-Z%]/', '', (string) $unit);
            }
        }
        return null;
    }

    private static function dimensions_to_css($value): ?string
    {
        if (!is_array($value)) {
            return null;
        }
        $unit = $value['unit'] ?? 'px';
        $sides = ['top', 'right', 'bottom', 'left'];
        $has_any = false;
        foreach ($sides as $s) {
            if (isset($value[$s]) && $value[$s] !== '' && $value[$s] !== null) {
                $has_any = true;
                break;
            }
        }
        if (!$has_any) {
            return null;
        }
        $out = [];
        foreach ($sides as $s) {
            $v = $value[$s] ?? null;
            if ($v === null || $v === '') {
                $out[] = '0';
            } elseif ($unit === 'custom') {
                $out[] = (string) $v;
            } elseif (is_numeric($v)) {
                $n = (float) $v;
                $out[] = ($n === 0.0) ? '0' : ($n . preg_replace('/[^a-zA-Z%]/', '', (string) $unit));
            } else {
                $out[] = (string) $v;
            }
        }
        return implode(' ', $out);
    }
}