<?php

namespace App\Services\School;

use App\Models\ClassSection;
use App\Models\Configuration;
use App\Models\Family;
use App\Models\FamilyGuardian;
use App\Models\FamilyStudent;
use App\Models\PromotionQueue;
use App\Models\Student;
use App\Models\User;
use App\Services\EmailService;
use App\Services\Notifications\UserNotificationDispatchService;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Log;

class AccountEventService
{
    public function __construct(
        private EmailService $emailService,
        private UserNotificationDispatchService $notifier
    ) {
    }

    public function newAccountAdded(array $userData): array
    {
        $subject = 'Welcome to Al Rahma Sunday School!';
        $message = $this->renderEmail('emails/welcome_user', ['user' => $userData], $subject);

        $sent = false;
        if (!empty($userData['email'])) {
            $sent = $this->emailService->send(
                (string) $userData['email'],
                $subject,
                $message,
                'registration'
            );
        }

        $supportMessage = $this->renderEmail('emails/support_new_account', ['user' => $userData], $subject);
        $this->emailService->send(
            'support@alrahmaisgl.org',
            'New Account Created: ' . trim((string) ($userData['firstname'] ?? '') . ' ' . (string) ($userData['lastname'] ?? '')),
            $supportMessage,
            'notifications'
        );

        $this->ensureFamilyLinks($userData);

        return ['ok' => $sent];
    }

    public function studentRegistered(array $data): array
    {
        if (empty($data['parents']) || !is_array($data['parents'])) {
            Log::warning('StudentRegistered: missing parent data');
            return ['ok' => false, 'message' => 'Missing parent data.'];
        }

        $studentFullName = trim((string) ($data['firstname'] ?? '') . ' ' . (string) ($data['lastname'] ?? ''));
        if (!empty($data['parents']['user_id'])) {
            $title = 'Your child has been registered';
            $msg = "{$studentFullName} has been successfully registered to Al Rahma Sunday School.";
            $this->notifier->notifyUser((int) $data['parents']['user_id'], $title, $msg, ['in_app', 'email'], 'registration', 'parent');
        }

        $adminMessage = $this->renderEmail('emails/admin_student_registered', ['student' => $data], 'Student Registered');
        $this->emailService->send(
            'registration@alrahmaisgl.org',
            "New Student Registered: {$studentFullName}",
            $adminMessage,
            'notifications'
        );

        return ['ok' => true];
    }

    public function deleteUnverifiedUser(array $user): array
    {
        $this->notifier->notifyUser(
            (int) ($user['id'] ?? 0),
            'Account Deleted - Unverified',
            'Your account was deleted because it was not verified within the time limit.',
            ['email'],
            'notifications',
            'parent'
        );

        $adminEmails = array_map('trim', explode(',', (string) Configuration::getConfigValueByKey('delete_email_notify')));
        $adminEmails = array_filter($adminEmails, static fn ($e) => $e !== '');
        foreach ($adminEmails as $adminEmail) {
            $body = "Unverified account deleted: ID {$user['id']}, Email {$user['email']}";
            $this->emailService->send($adminEmail, 'Unverified User Deleted', $body, 'notifications');
        }

        return ['ok' => true];
    }

    public function userRegistered(array $user): array
    {
        $this->notifier->notifyUser((int) ($user['id'] ?? 0), 'Welcome!', 'Thanks for registering with our school system.', ['in_app', 'email'], 'notifications', 'parent');
        return ['ok' => true];
    }

    public function userProfileUpdated(array $user): array
    {
        $this->notifier->notifyUser((int) ($user['id'] ?? 0), 'Profile Updated', 'Your profile information was successfully updated.', ['in_app'], 'notifications', 'parent');
        return ['ok' => true];
    }

    public function userDeactivated(array $user): array
    {
        $this->notifier->notifyUser((int) ($user['id'] ?? 0), 'Account Deactivated', 'Your account has been deactivated by the administrator.', ['in_app', 'email'], 'notifications', 'parent');
        return ['ok' => true];
    }

    public function scoresPosted(array $data): array
    {
        foreach ((array) ($data['students'] ?? []) as $student) {
            $this->notifier->notifyUser((int) ($student['id'] ?? 0), 'New Score Available', 'A new score has been posted.', ['in_app', 'email'], 'registration', 'student');
        }
        return ['ok' => true];
    }

    public function finalScoreReleased(array $data): array
    {
        foreach ((array) ($data['students'] ?? []) as $student) {
            $this->notifier->notifyUser((int) ($student['id'] ?? 0), 'Final Score Released', 'Your final score for the semester is now available.', ['in_app', 'email'], 'registration', 'student');
        }

        $this->preparePromotionQueue();

        return ['ok' => true];
    }

    public function studentMarkedAbsent(array $record): array
    {
        $msg = (string) ($record['student_name'] ?? 'Student') . ' was absent on ' . (string) ($record['date'] ?? '');
        $this->notifier->notifyUser((int) ($record['parent_id'] ?? 0), 'Absence Notification', $msg, ['in_app', 'email'], 'registration', 'parent');
        return ['ok' => true];
    }

    public function studentMarkedLate(array $record): array
    {
        $msg = (string) ($record['student_name'] ?? 'Student') . ' was late on ' . (string) ($record['date'] ?? '');
        $this->notifier->notifyUser((int) ($record['parent_id'] ?? 0), 'Late Notification', $msg, ['in_app', 'email'], 'registration', 'parent');
        return ['ok' => true];
    }

    public function paymentMissed(array $user): array
    {
        $this->notifier->notifyUser((int) ($user['id'] ?? 0), 'Payment Missed', 'You have missed a scheduled payment. Please settle your balance.', ['in_app', 'email'], 'payment', 'parent');
        return ['ok' => true];
    }

    public function classScheduleUpdated(array $data): array
    {
        foreach ((array) ($data['students'] ?? []) as $student) {
            $this->notifier->notifyUser((int) ($student['id'] ?? 0), 'Schedule Update', 'Your class schedule has been updated.', ['in_app'], 'notifications', 'student');
        }
        return ['ok' => true];
    }

    public function newMessageReceived(array $data): array
    {
        $msg = 'You have a new message from ' . (string) ($data['sender_name'] ?? '');
        $this->notifier->notifyUser((int) ($data['recipient_id'] ?? 0), 'New Message Received', $msg, ['in_app'], 'notifications', 'parent');
        return ['ok' => true];
    }

    public function systemAnnouncementPosted(array $data): array
    {
        $targetGroup = (string) ($data['target_group'] ?? 'everyone');
        $users = (array) ($data['users'] ?? []);
        if (empty($users) && $targetGroup !== '') {
            $users = User::getUsersByRole($targetGroup);
        }

        foreach ($users as $user) {
            $this->notifier->notifyUser((int) ($user['id'] ?? 0), (string) ($data['title'] ?? ''), (string) ($data['message'] ?? ''), ['in_app'], 'notifications', $targetGroup);
        }
        return ['ok' => true];
    }

    public function customNotification(array $data): array
    {
        $this->notifier->notifyUser(
            (int) ($data['user_id'] ?? 0),
            (string) ($data['title'] ?? ''),
            (string) ($data['message'] ?? ''),
            (array) ($data['channels'] ?? ['in_app']),
            'notifications',
            (string) ($data['target_group'] ?? 'everyone')
        );

        return ['ok' => true];
    }

    private function ensureFamilyLinks(array $userData): void
    {
        $userId = (int) ($userData['id'] ?? 0);
        if ($userId <= 0) {
            return;
        }

        DB::transaction(function () use ($userData, $userId): void {
            $familyCode = 'FAM-' . $userId;
            $family = Family::query()->where('family_code', $familyCode)->first();
            if (!$family) {
                $householdName = trim('Family of ' . ((string) ($userData['firstname'] ?? '') . ' ' . (string) ($userData['lastname'] ?? '')));
                $family = Family::query()->create([
                    'family_code' => $familyCode,
                    'household_name' => $householdName,
                    'address_line1' => $userData['address_street'] ?? null,
                    'city' => $userData['city'] ?? null,
                    'state' => $userData['state'] ?? null,
                    'postal_code' => $userData['zip'] ?? null,
                    'primary_phone' => $userData['cellphone'] ?? null,
                    'is_active' => 1,
                ]);
            }

            FamilyGuardian::query()->firstOrCreate([
                'family_id' => (int) $family->id,
                'user_id' => $userId,
            ], [
                'relation' => 'primary',
                'is_primary' => 1,
                'receive_emails' => 1,
                'receive_sms' => 0,
            ]);

            $studentIds = Student::query()
                ->where('parent_id', $userId)
                ->pluck('id')
                ->map(fn ($id) => (int) $id)
                ->all();

            foreach ($studentIds as $studentId) {
                FamilyStudent::query()->firstOrCreate([
                    'family_id' => (int) $family->id,
                    'student_id' => $studentId,
                ], [
                    'is_primary_home' => 1,
                ]);
            }
        });
    }

    private function preparePromotionQueue(): void
    {
        try {
            $currentYear = (string) Configuration::getConfigValueByKey('school_year');
            if (!preg_match('/^(\d{4})-(\d{4})$/', $currentYear, $m)) {
                return;
            }
            $y1 = (int) $m[1];
            $y2 = (int) $m[2];
            $nextYear = ($y1 + 1) . '-' . ($y2 + 1);

            $rows = DB::table('students as s')
                ->select('s.id as student_id', 'sc.class_section_id', 'fall.semester_score as fall_score', 'spring.semester_score as spring_score')
                ->leftJoin('student_class as sc', function ($join) use ($currentYear) {
                    $join->on('sc.student_id', '=', 's.id')
                        ->where('sc.school_year', '=', $currentYear);
                })
                ->leftJoin('semester_scores as fall', function ($join) use ($currentYear) {
                    $join->on('fall.student_id', '=', 's.id')
                        ->where('fall.semester', '=', 'fall')
                        ->where('fall.school_year', '=', $currentYear);
                })
                ->leftJoin('semester_scores as spring', function ($join) use ($currentYear) {
                    $join->on('spring.student_id', '=', 's.id')
                        ->where('spring.semester', '=', 'spring')
                        ->where('spring.school_year', '=', $currentYear);
                })
                ->get();

            foreach ($rows as $row) {
                $fall = isset($row->fall_score) ? (float) $row->fall_score : null;
                $spring = isset($row->spring_score) ? (float) $row->spring_score : null;
                if ($fall === null || $spring === null) {
                    continue;
                }
                $finalAvg = ($fall + $spring) / 2.0;
                if ($finalAvg < 60.0) {
                    continue;
                }
                $fromSection = (int) ($row->class_section_id ?? 0);
                if ($fromSection <= 0) {
                    continue;
                }
                $fromClassId = (int) (ClassSection::getClassId($fromSection) ?? 0);
                if ($fromClassId <= 0) {
                    continue;
                }
                $toClassId = $fromClassId + 1;

                PromotionQueue::upsertQueue([
                    'student_id' => (int) $row->student_id,
                    'from_class_section_id' => $fromSection,
                    'to_class_id' => $toClassId,
                    'to_class_section_id' => null,
                    'school_year_from' => $currentYear,
                    'school_year_to' => $nextYear,
                    'status' => 'queued',
                    'updated_by' => null,
                ]);
            }
        } catch (\Throwable $e) {
            Log::error('Promotion queue build failed: ' . $e->getMessage());
        }
    }

    private function renderEmail(string $viewName, array $data, string $fallbackTitle): string
    {
        Log::debug('Skipping Blade email template', ['view' => $viewName]);

        return '<p>' . e($fallbackTitle) . '</p>';
    }
}