<?php

namespace App\Services\Care;

use App\Models\Appointment;
use App\Models\Organization;
use App\Models\Patient;
use App\Services\Messaging\CustomerEmailClient;
use App\Services\Messaging\CustomerSmsClient;
use App\Services\Messaging\MessagingCredentialsService;
use App\Support\OrganizationBranding;
use Illuminate\Support\Facades\Log;

class AppointmentPatientNotifier
{
    public const SETTING_BOOKED_SMS = 'notify_appointment_booked_sms';

    public const SETTING_BOOKED_EMAIL = 'notify_appointment_booked_email';

    public const SETTING_VIDEO_SMS = 'notify_video_scheduled_sms';

    public const SETTING_VIDEO_EMAIL = 'notify_video_scheduled_email';

    public function __construct(
        private MessagingCredentialsService $credentials,
        private CustomerSmsClient $sms,
        private CustomerEmailClient $email,
    ) {}

    public function organizationWants(Organization $organization, string $setting): bool
    {
        return (bool) data_get($organization->settings, $setting, false);
    }

    public function notifyAppointmentBooked(Organization $organization, Appointment $appointment): void
    {
        $appointment->loadMissing(['patient', 'branch', 'practitioner']);
        $patient = $appointment->patient;
        if (! $patient) {
            return;
        }

        $when = $appointment->scheduled_at?->timezone($organization->timezone)->format('D, d M Y \a\t H:i') ?? 'the scheduled time';
        $branch = $appointment->branch?->name ?? $organization->name;
        $practitioner = $appointment->practitioner?->name;

        if ($this->organizationWants($organization, self::SETTING_BOOKED_SMS)) {
            $parts = [
                $organization->name.': appointment confirmed for '.$when.' at '.$branch.'.',
            ];
            if ($practitioner) {
                $parts[] = 'With '.$practitioner.'.';
            }
            $parts[] = 'Reply or call the clinic if you need to reschedule.';
            $this->sendSms($organization, $patient, implode(' ', $parts), 'appointment.booked_sms');
        }

        if ($this->organizationWants($organization, self::SETTING_BOOKED_EMAIL)) {
            $lines = [
                'Hello '.$patient->fullName().',',
                '',
                'Your appointment at '.$organization->name.' has been scheduled.',
                '',
                'When: '.$when,
                'Where: '.$branch,
            ];
            if ($practitioner) {
                $lines[] = 'With: '.$practitioner;
            }
            if ($appointment->reason) {
                $lines[] = 'Reason: '.$appointment->reason;
            }
            $lines[] = '';
            $lines[] = 'If you need to reschedule, please contact the clinic.';

            $this->sendEmail(
                $organization,
                $patient,
                'Appointment confirmed — '.$organization->name,
                implode("\n", $lines),
                'appointment.booked_email',
            );
        }
    }

    public function notifyVideoScheduled(Organization $organization, Appointment $appointment): void
    {
        $appointment->loadMissing(['patient', 'branch']);
        $patient = $appointment->patient;
        $joinUrl = (string) ($appointment->meet_join_url ?? '');
        if (! $patient || $joinUrl === '') {
            return;
        }

        $when = $appointment->scheduled_at?->timezone($organization->timezone)->format('D, d M Y \a\t H:i') ?? 'your appointment time';

        if ($this->organizationWants($organization, self::SETTING_VIDEO_SMS)) {
            $this->sendSms(
                $organization,
                $patient,
                $organization->name.': video visit on '.$when.'. Join: '.$joinUrl,
                'appointment.video_sms',
            );
        }

        // Video email is delivered by Ladill Meet via invite_emails when the setting is on.
        // Also send a Care-branded copy when Bird is connected so branding matches other notices.
        if ($this->organizationWants($organization, self::SETTING_VIDEO_EMAIL)) {
            $lines = [
                'Hello '.$patient->fullName().',',
                '',
                'A video visit has been scheduled with '.$organization->name.'.',
                '',
                'When: '.$when,
                'Join link: '.$joinUrl,
                '',
                'Open the link at the appointment time to join.',
            ];

            $this->sendEmail(
                $organization,
                $patient,
                'Video visit — '.$organization->name,
                implode("\n", $lines),
                'appointment.video_email',
            );
        }
    }

    /**
     * When true, Meet should also email the patient join invite.
     * Prefer Care-branded email when Bird is connected; otherwise fall back to Meet invites.
     */
    public function shouldInvitePatientEmailViaMeet(Organization $organization): bool
    {
        if (! $this->organizationWants($organization, self::SETTING_VIDEO_EMAIL)) {
            return false;
        }

        $credential = $this->credentials->forOrganization($organization);

        // Avoid double emails when Care Bird can send the branded notice.
        return ! $credential->hasValidBird();
    }

    private function sendSms(Organization $organization, Patient $patient, string $message, string $auditAction): void
    {
        $phone = trim((string) $patient->phone);
        if ($phone === '') {
            return;
        }

        try {
            $credential = $this->credentials->forOrganization($organization);
            if (! $credential->hasValidSms()) {
                return;
            }

            $apiKey = $credential->smsApiKey();
            if (! $apiKey) {
                return;
            }

            $sent = $this->sms->send($apiKey, $phone, $message, (string) $credential->sms_sender_id);
            AuditLogger::record(
                $organization->owner_ref,
                $sent ? $auditAction.'_sent' : $auditAction.'_failed',
                $organization->id,
                $organization->owner_ref,
                Patient::class,
                $patient->id,
                [
                    'to' => $phone,
                    'error' => $sent ? null : $this->sms->lastError(),
                ],
            );
        } catch (\Throwable $e) {
            Log::warning('Care appointment SMS notification failed', [
                'organization_id' => $organization->id,
                'patient_id' => $patient->id,
                'error' => $e->getMessage(),
            ]);
        }
    }

    private function sendEmail(
        Organization $organization,
        Patient $patient,
        string $subject,
        string $body,
        string $auditAction,
    ): void {
        $to = (string) $patient->email;
        if (! filter_var($to, FILTER_VALIDATE_EMAIL)) {
            return;
        }

        try {
            $credential = $this->credentials->forOrganization($organization);
            if (! $credential->hasValidBird()) {
                return;
            }

            $apiKey = $credential->birdApiKey();
            if (! $apiKey) {
                return;
            }

            $html = OrganizationBranding::wrapEmailHtml(nl2br(e($body)), $organization);
            $sent = $this->email->send(
                $apiKey,
                (string) $credential->bird_from_email,
                $credential->bird_from_name,
                $to,
                $subject,
                $html,
                $body,
            );

            AuditLogger::record(
                $organization->owner_ref,
                $sent ? $auditAction.'_sent' : $auditAction.'_failed',
                $organization->id,
                $organization->owner_ref,
                Patient::class,
                $patient->id,
                [
                    'to' => $to,
                    'subject' => $subject,
                    'error' => $sent ? null : $this->email->lastError(),
                ],
            );
        } catch (\Throwable $e) {
            Log::warning('Care appointment email notification failed', [
                'organization_id' => $organization->id,
                'patient_id' => $patient->id,
                'error' => $e->getMessage(),
            ]);
        }
    }
}