<?php 
namespace App\Controllers\View;

use App\Controllers\BaseController;
use App\Models\StudentModel;
use App\Models\FamilyModel;
use App\Models\FamilyStudentModel;
use App\Models\FamilyGuardianModel;
use App\Models\FamilyCommPrefModel; // optional
use App\Models\EmailTemplateModel;
use App\Models\CommunicationLogModel;

class CommunicationController extends BaseController
{
    protected StudentModel $studentModel;
    protected FamilyModel $familyModel;
    protected FamilyStudentModel $fsModel;
    protected FamilyGuardianModel $fgModel;
    protected ?FamilyCommPrefModel $fcpModel = null;
    protected EmailTemplateModel $templateModel;
    protected CommunicationLogModel $logModel;

    public function __construct()
    {
        $this->studentModel  = new StudentModel();
        $this->familyModel   = new FamilyModel();
        $this->fsModel       = new FamilyStudentModel();
        $this->fgModel       = new FamilyGuardianModel();
        if (class_exists(FamilyCommPrefModel::class)) {
            $this->fcpModel = new FamilyCommPrefModel();
        }
        $this->templateModel = new EmailTemplateModel();
        $this->logModel      = new CommunicationLogModel();
    }

    public function index()
    {
        $students  = $this->studentModel->orderBy('lastname, firstname', 'asc')->findAll();
        $templates = $this->templateModel->getActiveTemplates();
        return view('communications/index', compact('students','templates'));
    }

    // AJAX: families for a student
    public function families(int $studentId)
    {
        if (!$this->request->isAJAX()) return $this->response->setStatusCode(400)->setJSON(['error' => 'Bad request']);
        $families = $this->fsModel->getFamiliesForStudent($studentId);
        return $this->response->setJSON(['data' => $families]);
    }

    // AJAX: guardians for a family
    public function guardians(int $familyId)
    {
        if (!$this->request->isAJAX()) return $this->response->setStatusCode(400)->setJSON(['error' => 'Bad request']);
        $db = \Config\Database::connect();
        $rows = $db->query("SELECT u.id as user_id, u.firstname, u.lastname, u.email, fg.relation, fg.is_primary, fg.receive_emails, fg.receive_sms\n                             FROM family_guardians fg\n                             JOIN users u ON u.id = fg.user_id\n                             WHERE fg.family_id = ?", [$familyId])->getResultArray();
        return $this->response->setJSON(['data' => $rows]);
    }

    public function preview()
    {
        if (!$this->request->isAJAX()) return $this->response->setStatusCode(400)->setJSON(['error' => 'Bad request']);

        $templateKey = (string) $this->request->getPost('template_key');
        $studentId   = (int) $this->request->getPost('student_id');
        $familyId    = (int) $this->request->getPost('family_id');
        $varsPost    = $this->request->getPost('vars');
        $vars        = is_array($varsPost) ? $varsPost : json_decode((string)$varsPost, true) ?? [];

        $template = $this->templateModel->findByKey($templateKey);
        if (!$template) return $this->response->setStatusCode(404)->setJSON(['error' => 'Template not found']);

        $student = $this->studentModel->getStudentBasic($studentId);
        if (!$student) return $this->response->setStatusCode(404)->setJSON(['error' => 'Student not found']);

        // Build salutation from guardians in the chosen family
        $db = \Config\Database::connect();
        $gs = $db->query("SELECT u.firstname, u.lastname\n                           FROM family_guardians fg\n                           JOIN users u ON u.id = fg.user_id\n                           WHERE fg.family_id = ? AND fg.receive_emails = 1\n                           ORDER BY fg.is_primary DESC, u.lastname, u.firstname", [$familyId])->getResultArray();
        $sal = 'Parent/Guardian';
        if ($gs) {
            $names = array_map(fn($r)=> trim(($r['firstname']??'').' '.($r['lastname']??'')), $gs);
            $sal = implode(' & ', $names);
        }

        $autoVars = [
            'student_fullname' => trim(($student['firstname'] ?? '').' '.($student['lastname'] ?? '')),
            'student_grade'    => $student['grade'] ?? '',
            'parent_salutation'=> $sal,
            'date'             => local_date(utc_now(), 'Y-m-d'),
            'school_name'      => 'Al Rahma Sunday School',
            'teacher_name'     => (string)(session('display_name') ?? 'Teacher'),
        ];
        $all = array_merge($autoVars, $vars);

        $subject = $this->renderTwig($template['subject'], $all);
        $body    = nl2br($this->renderTwig($template['body'], $all));

        return $this->response->setJSON(['subject' => $subject, 'html' => $body]);
    }

    public function send()
    {
        $rules = [
            'student_id'   => 'required|integer',
            'family_id'    => 'required|integer',
            'template_key' => 'required|string',
            'subject'      => 'required|string',
            'body'         => 'required|string',
            'recipients'   => 'required|string' // JSON array
        ];
        if (!$this->validate($rules)) {
            return redirect()->back()->with('error', 'Invalid form submission.');
        }

        $studentId   = (int) $this->request->getPost('student_id');
        $familyId    = (int) $this->request->getPost('family_id');
        $templateKey = (string) $this->request->getPost('template_key');
        $subject     = (string) $this->request->getPost('subject');
        $bodyHtml    = (string) $this->request->getPost('body');
        $recipients  = json_decode((string)$this->request->getPost('recipients'), true) ?? [];
        $cc          = json_decode((string)($this->request->getPost('cc') ?? '[]'), true) ?? [];
        $bcc         = json_decode((string)($this->request->getPost('bcc') ?? '[]'), true) ?? [];

        $student = $this->studentModel->getStudentBasic($studentId);
        if (!$student) return redirect()->back()->with('error', 'Student not found');

        // Send email (PHPMailer via service('mailer'))
        $sendOk = false; $error = null;
        try {
            $mailer = service('mailer');
            foreach (array_unique($recipients) as $to) { if ($to) $mailer->addAddress($to); }
            foreach (array_unique($cc) as $c) { if ($c) $mailer->addCC($c); }
            foreach (array_unique($bcc) as $b){ if ($b) $mailer->addBCC($b); }
            $mailer->Subject = $subject;
            $mailer->isHTML(true);
            $mailer->Body = $bodyHtml;
            $mailer->AltBody = strip_tags($bodyHtml);
            $sendOk = $mailer->send();
        } catch (\Throwable $t) {
            $error = $t->getMessage();
        }

        // Log
        $this->logModel->insert([
            'student_id'   => $studentId,
            'family_id'    => $familyId,
            'student_name' => trim(($student['firstname'] ?? '').' '.($student['lastname'] ?? '')),
            'template_key' => $templateKey,
            'subject'      => $subject,
            'body'         => $bodyHtml,
            'recipients'   => json_encode(array_values($recipients)),
            'cc'           => json_encode(array_values($cc)),
            'bcc'          => json_encode(array_values($bcc)),
            'status'       => $sendOk ? 'sent' : 'failed',
            'error_message'=> $error,
            'sent_by'      => (int)(session('user_id') ?? 0),
            'metadata'     => null,
        ]);

        return $sendOk
            ? redirect()->to('/communications')->with('success', 'Email sent successfully.')
            : redirect()->back()->with('error', 'Failed to send email: '.($error ?? 'Unknown error'));
    }

    private function renderTwig(string $template, array $vars): string
    {
        return preg_replace_callback('/\{\{\s*([a-zA-Z0-9_\.]+)\s*\}\}/', function($m) use ($vars) {
            $key = $m[1];
            return htmlspecialchars((string)($vars[$key] ?? ''), ENT_QUOTES, 'UTF-8');
        }, $template);
    }
}