<?php

namespace FluentAuth\App\Http\Controllers;

use FluentAuth\App\Helpers\Arr;
use FluentAuth\App\Helpers\Helper;
use FluentAuth\App\Services\SmartCodeParser;
use FluentAuth\App\Services\SystemEmailService;

class SystemEmailsController
{
    public static function getEmails(\WP_REST_Request $request)
    {
        return [
            'emailIndexes' => array_values(SystemEmailService::getEmailIndexes()),
        ];
    }

    public static function findEmail(\WP_REST_Request $request)
    {
        $remailId = $request->get_param('email_id');

        if (!$remailId) {
            return new \WP_Error('invalid_email_id', __('Email ID is required', 'fluent-security'), ['status' => 400]);
        }

        $emailIndexes = SystemEmailService::getEmailIndexes();

        if (!isset($emailIndexes[$remailId])) {
            return new \WP_Error('invalid_email_id', __('Email ID is invalid', 'fluent-security'), ['status' => 400]);
        }

        $emailSettings = SystemEmailService::getGlobalSettings();

        $targetEmail = $emailIndexes[$remailId];

        $contextSmartCodes = Arr::get($targetEmail, 'additional_smartcodes', []);

        $userSmartCodes = [
            '{{user.first_name}}'   => __('First Name', 'fluent-security'),
            '{{user.last_name}}'    => __('Last Name', 'fluent-security'),
            '{{user.display_name}}' => __('Display Name', 'fluent-security'),
            '{{user.user_email}}'   => __('Email', 'fluent-security'),
            '{{user.user_login}}'   => __('Username', 'fluent-security'),
            '{{user.roles}}'        => __('User Roles', 'fluent-security'),
        ];

        if ($contextSmartCodes) {
            $userSmartCodes = array_merge($contextSmartCodes, $userSmartCodes);
        }

        $editorCodes = [
            [
                'key'        => 'user',
                'title'      => __('User Data', 'fluent-security'),
                'shortcodes' => apply_filters('fluentcrm_auth/email_smartcodes', $userSmartCodes)
            ],
            [
                'key'        => 'site',
                'title'      => __('Site Data', 'fluent-security'),
                'shortcodes' => apply_filters('fluentcrm_auth/email_smartcodes', [
                    '{{site.name}}'        => __('Site Title', 'fluent-security'),
                    '{{site.description}}' => __('Site tagline', 'fluent-security'),
                    '{{site.admin_email}}' => __('Admin Email', 'fluent-security'),
                    '##site.url##'         => __('Site URL', 'fluent-security'),
                    '##site.login_url##'   => __('Login Url', 'fluent-security'),
                ])
            ]
        ];

        if (!isset($emailSettings['emails'][$remailId])) {
            return new \WP_Error('invalid_email_id', __('Email ID is invalid', 'fluent-security'), ['status' => 400]);
        }

        $defaultEmails = SystemEmailService::getEmailDefaults();

        return [
            'email'           => $targetEmail,
            'settings'        => $emailSettings['emails'][$remailId],
            'smartcodes'      => $editorCodes,
            'default_content' => Arr::get($defaultEmails, $remailId),
        ];
    }

    public static function previewEmail(\WP_REST_Request $request)
    {
        $remailId = $request->get_param('email_id');

        if (!$remailId) {
            return new \WP_Error('invalid_email_id', __('Email ID is required', 'fluent-security'), ['status' => 400]);
        }

        $emailIndexes = SystemEmailService::getEmailIndexes();

        if (!isset($emailIndexes[$remailId])) {
            return new \WP_Error('invalid_email_id', __('Email ID is invalid', 'fluent-security'), ['status' => 400]);
        }

        $emailData = (array) $request->get_param('email_data');

        if (empty($emailData['body']) || empty($emailData['body'])) {
            return new \WP_Error('invalid_email_settings', __('Email subject and body are required', 'fluent-security'), ['status' => 400]);
        }

        $subject = sanitize_text_field(Arr::get($emailData, 'subject'));
        $emailBody = wp_kses_post(Arr::get($emailData, 'body'));

        if (!defined('FLUENTAUTH_PREVIEWING_EMAIL')) {
            define('FLUENTAUTH_PREVIEWING_EMAIL', true);
        }

        $wpUser = get_user_by('ID', get_current_user_id());
        $subject = (new SmartCodeParser())->parse($subject, $wpUser);
        $body = (new SmartCodeParser())->parse($emailBody, $wpUser);
        $body = SystemEmailService::withHtmlTemplate($body, null, $wpUser);

        return [
            'rendered_email' => [
                'subject' => $subject,
                'body'    => $body,
            ]
        ];
    }

    public static function saveEmailSettings(\WP_REST_Request $request)
    {
        $emailId = $request->get_param('email_id');

        if (!$emailId) {
            return new \WP_Error('invalid_email_id', __('Email ID is required', 'fluent-security'), ['status' => 400]);
        }

        $emailIndexes = SystemEmailService::getEmailIndexes();

        if (!isset($emailIndexes[$emailId])) {
            return new \WP_Error('invalid_email_id', __('Email ID is invalid', 'fluent-security'), ['status' => 400]);
        }

        $allEmailSettings = SystemEmailService::getGlobalSettings();

        $settings = (array) $request->get_param('settings');

        if ($settings['status'] == 'active') {
            $allEmailSettings['emails'][$emailId]['status'] = 'active';

            $subject = sanitize_text_field(Arr::get($settings, 'email.subject'));
            $emailBody = wp_kses_post(Arr::get($settings, 'email.body'));

            if (!$subject || !$emailBody) {
                return new \WP_Error('invalid_email_settings', __('Email subject and body are required', 'fluent-security'), ['status' => 400]);
            }

            $requiredSmartCodes = Arr::get($emailIndexes, $emailId . '.required_smartcodes', []);

            if (!self::validateEmailBody($emailBody, $requiredSmartCodes)) {
                return new \WP_Error('invalid_email_settings', __('Email body is not valid. Please check the smartcodes.', 'fluent-security'), [
                    'status'              => 400,
                    'required_smartcodes' => $requiredSmartCodes
                ]);
            }

            $allEmailSettings['emails'][$emailId]['email'] = [
                'subject' => sanitize_text_field(Arr::get($settings, 'email.subject')),
                'body'    => $emailBody,
            ];
        } else if ($settings['status'] == 'disabled') {
            $allEmailSettings['emails'][$emailId]['status'] = 'disabled';
            $allEmailSettings['emails'][$emailId]['email'] = [
                'subject' => sanitize_text_field(Arr::get($settings, 'email.subject')),
                'body'    => wp_kses_post(Arr::get($settings, 'email.body')),
            ];
        } else {
            unset($allEmailSettings['emails'][$emailId]);
        }

        update_option('fa_system_email_settings', $allEmailSettings, false);

        return [
            'message' => __('Email settings has been succcesfully updated', 'fluent-security')
        ];
    }

    public static function getTemplateSettings(\WP_REST_Request $request)
    {
        $globalSettings = SystemEmailService::getGlobalSettings();
        $settings = Arr::get($globalSettings, 'template_settings', []);

        $defaultContent = SystemEmailService::getDefaultEmailBody('user_registration_to_user');
        $user = get_user_by('ID', get_current_user_id());

        if (!defined('FLUENTAUTH_PREVIEWING_EMAIL')) {
            define('FLUENTAUTH_PREVIEWING_EMAIL', true);
        }

        $emailFooter = SystemEmailService::getEmailFooter();

        if (!$emailFooter) {
            $emailFooter = 'Email Footer Placeholder';
        }

        $defaultContent = (new SmartCodeParser())->parse($defaultContent, $user);
        $defaultContent = SystemEmailService::withHtmlTemplate($defaultContent, $emailFooter, $user);

        return [
            'settings'        => $settings,
            'default_content' => $defaultContent,
            'default_colors'  => [
                'body_bg'              => '#f3f4f6',
                'content_bg'           => '#ffffff',
                'content_color'        => '#374151',
                'footer_content_color' => '#6b7280',
                'highlight_bg'         => 'rgb(249, 250, 251)',
                'highlight_color'      => '#374151',
            ]
        ];
    }

    public static function saveTemplateSettings(\WP_REST_Request $request)
    {
        $newSettings = (array) $request->get_param('settings');

        $globalSettings = SystemEmailService::getGlobalSettings();
        $settings = Arr::get($globalSettings, 'template_settings', []);
        $newSettings = Arr::only($newSettings, array_keys($settings));
        $newSettings['footer_text'] = wp_kses_post($newSettings['footer_text']);

        // Sanitize color fields
        $colorFields = ['body_bg', 'content_bg', 'content_color', 'footer_content_color', 'highlight_bg', 'highlight_color'];
        foreach ($colorFields as $field) {
            if (!empty($newSettings[$field])) {
                $newSettings[$field] = self::sanitizeColorValue($newSettings[$field]);
            }
        }

        // Sanitize remaining text fields
        $textFields = ['font_family', 'template', 'logo', 'email_footer'];
        foreach ($textFields as $field) {
            if (isset($newSettings[$field])) {
                $newSettings[$field] = sanitize_text_field($newSettings[$field]);
            }
        }

        // Validate the data
        if (!empty($newSettings['from_email'])) {
            if (!is_email($newSettings['from_email'])) {
                return new \WP_Error('invalid_email', __('From email is not valid', 'fluent-security'), ['status' => 400]);
            }
        }

        if (!empty($newSettings['from_name'])) {
            $newSettings['from_name'] = sanitize_text_field($newSettings['from_name']);
        }

        if (!empty($newSettings['reply_to_email'])) {
            if (!is_email($newSettings['reply_to_email'])) {
                return new \WP_Error('invalid_email', __('Reply to email is not valid', 'fluent-security'), ['status' => 400]);
            }
        }

        if (!empty($newSettings['reply_to_name'])) {
            $newSettings['reply_to_name'] = sanitize_text_field($newSettings['reply_to_name']);
        }

        $globalSettings['template_settings'] = $newSettings;

        update_option('fa_system_email_settings', $globalSettings, false);

        return [
            'message' => __('Email template settings has been succcesfully updated', 'fluent-security')
        ];
    }

    private static function sanitizeColorValue($value)
    {
        $value = trim($value);

        // Allow hex colors: #fff, #ffffff, #ffffffff
        if (preg_match('/^#[0-9a-fA-F]{3,8}$/', $value)) {
            return $value;
        }

        // Allow rgb/rgba: rgb(0, 0, 0) or rgba(0, 0, 0, 0.5)
        if (preg_match('/^rgba?\(\s*\d{1,3}\s*,\s*\d{1,3}\s*,\s*\d{1,3}\s*(,\s*(0|1|0?\.\d+))?\s*\)$/', $value)) {
            return $value;
        }

        return '';
    }

    private static function validateEmailBody($emailBody, $smartCodes = [])
    {
        if (!$smartCodes) {
            return true;
        }

        foreach ($smartCodes as $smartCode) {
            $codes = ['{{' . $smartCode . '}}', '##' . $smartCode . '##'];
            $hasCode = str_contains($emailBody, $codes[0]) || str_contains($emailBody, $codes[1]);
            if (!$hasCode) {
                return false;
            }
        }

        return true;
    }
}