<?php

namespace App\Services\Care;

use App\Models\Appointment;
use App\Models\Bill;
use App\Models\InvestigationRequest;
use App\Models\Organization;
use App\Models\Patient;
use App\Models\Prescription;
use App\Services\Queue\QueueClient;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Http\Client\RequestException;
use Illuminate\Support\Facades\Log;

/**
 * Bridges Care workflow entities to Ladill Queue tickets for the matching department queue.
 */
class CareQueueBridge
{
    public function __construct(
        protected QueueClient $queue,
        protected CareQueueProvisioner $provisioner,
        protected PlanService $plans,
        protected SpecialtyModuleService $specialties,
    ) {}

    public function isEnabled(Organization $organization): bool
    {
        return $this->plans->canUseQueueIntegration($organization)
            && (bool) data_get($organization->settings, 'queue_integration_enabled')
            && $this->queue->configured();
    }

    /**
     * Resolve which queue context an appointment should use (specialty if applicable).
     */
    public function contextForAppointment(Organization $organization, Appointment $appointment): string
    {
        $departmentId = $appointment->department_id;
        if (! $departmentId) {
            return CareQueueContexts::CONSULTATION;
        }

        foreach ($this->specialties->enabledKeys($organization) as $key) {
            $deptIds = data_get($organization->settings, "specialty_module_provisioning.{$key}.department_ids", []);
            if (is_array($deptIds) && in_array($departmentId, array_map('intval', $deptIds), true)) {
                return $key;
            }
        }

        return CareQueueContexts::CONSULTATION;
    }

    public function issueForAppointment(Organization $organization, Appointment $appointment): ?Appointment
    {
        if (! $this->isEnabled($organization) || filled($appointment->queue_ticket_uuid)) {
            return $appointment;
        }

        $context = $this->contextForAppointment($organization, $appointment);
        $ticket = $this->issue(
            $organization,
            $context,
            (int) $appointment->branch_id,
            $appointment->patient,
            [
                'care_entity' => 'appointment',
                'care_entity_uuid' => $appointment->uuid,
                'care_entity_id' => $appointment->id,
            ],
            $appointment->type === Appointment::TYPE_WALK_IN ? 'walk_in' : 'appointment',
            'appointment',
        );

        if (! $ticket) {
            return $appointment;
        }

        $this->applyTicket($appointment, $ticket);

        return $appointment->fresh();
    }

    public function issueForPrescription(Organization $organization, Prescription $prescription): ?Prescription
    {
        if (! $this->isEnabled($organization) || filled($prescription->queue_ticket_uuid)) {
            return $prescription;
        }

        $prescription->loadMissing(['patient', 'visit']);
        $branchId = (int) ($prescription->visit?->branch_id ?? 0);
        if ($branchId < 1) {
            return $prescription;
        }

        $ticket = $this->issue(
            $organization,
            CareQueueContexts::PHARMACY,
            $branchId,
            $prescription->patient,
            [
                'care_entity' => 'prescription',
                'care_entity_uuid' => $prescription->uuid,
                'care_entity_id' => $prescription->id,
            ],
        );

        if (! $ticket) {
            return $prescription;
        }

        $this->applyTicket($prescription, $ticket);

        return $prescription->fresh();
    }

    public function issueForInvestigation(Organization $organization, InvestigationRequest $request): ?InvestigationRequest
    {
        if (! $this->isEnabled($organization) || filled($request->queue_ticket_uuid)) {
            return $request;
        }

        $request->loadMissing('patient');
        $ticket = $this->issue(
            $organization,
            CareQueueContexts::LABORATORY,
            (int) $request->branch_id,
            $request->patient,
            [
                'care_entity' => 'investigation_request',
                'care_entity_uuid' => $request->uuid,
                'care_entity_id' => $request->id,
            ],
        );

        if (! $ticket) {
            return $request;
        }

        $this->applyTicket($request, $ticket);

        return $request->fresh();
    }

    public function issueForBill(Organization $organization, Bill $bill): ?Bill
    {
        if (! $this->isEnabled($organization) || filled($bill->queue_ticket_uuid)) {
            return $bill;
        }

        if (in_array($bill->status, [Bill::STATUS_PAID, Bill::STATUS_VOID], true)) {
            return $bill;
        }

        $bill->loadMissing('patient');
        $ticket = $this->issue(
            $organization,
            CareQueueContexts::BILLING,
            (int) $bill->branch_id,
            $bill->patient,
            [
                'care_entity' => 'bill',
                'care_entity_uuid' => $bill->uuid,
                'care_entity_id' => $bill->id,
            ],
        );

        if (! $ticket) {
            return $bill;
        }

        $this->applyTicket($bill, $ticket);

        return $bill->fresh();
    }

    /**
     * Call the next waiting ticket for a Care page context + branch.
     *
     * @return array{ticket: ?array<string, mixed>, entity: ?Model, resources: ?array<string, mixed>}
     */
    public function callNext(Organization $organization, string $context, int $branchId): array
    {
        $resources = $this->provisioner->ensure($organization, $context, $branchId);
        if (! $resources || empty($resources['queue_uuid']) || empty($resources['counter_uuid'])) {
            return ['ticket' => null, 'entity' => null, 'resources' => $resources];
        }

        $owner = (string) $organization->owner_ref;

        try {
            $ticket = $this->queue->callNext(
                $owner,
                (string) $resources['queue_uuid'],
                (string) $resources['counter_uuid'],
            );
        } catch (RequestException $e) {
            Log::warning('care.queue_call_next_failed', [
                'context' => $context,
                'branch_id' => $branchId,
                'message' => $e->getMessage(),
            ]);

            return ['ticket' => null, 'entity' => null, 'resources' => $resources];
        }

        if (! $ticket) {
            return ['ticket' => null, 'entity' => null, 'resources' => $resources];
        }

        $entity = $this->findEntityByTicket($organization, $context, (string) ($ticket['uuid'] ?? ''));
        if ($entity) {
            $this->applyTicket($entity, $ticket);
        }

        return ['ticket' => $ticket, 'entity' => $entity?->fresh(), 'resources' => $resources];
    }

    /**
     * Mark ticket as serving (Queue "start").
     *
     * @return array<string, mixed>|null
     */
    public function serve(Organization $organization, Model $entity): ?array
    {
        return $this->ticketAction($organization, $entity, 'start');
    }

    /**
     * Complete the Queue ticket linked to a Care entity.
     *
     * @return array<string, mixed>|null
     */
    public function complete(Organization $organization, Model $entity): ?array
    {
        return $this->ticketAction($organization, $entity, 'complete');
    }

    /**
     * Recall the Queue ticket linked to a Care entity.
     *
     * @return array<string, mixed>|null
     */
    public function recall(Organization $organization, Model $entity): ?array
    {
        return $this->ticketAction($organization, $entity, 'recall');
    }

    /**
     * @return array{enabled: bool, context: string, queue_uuid: ?string, counter_uuid: ?string}
     */
    public function listMeta(Organization $organization, string $context, int $branchId): array
    {
        if (! $this->isEnabled($organization)) {
            return [
                'enabled' => false,
                'context' => $context,
                'queue_uuid' => null,
                'counter_uuid' => null,
            ];
        }

        $resources = $this->provisioner->ensure($organization->fresh(), $context, $branchId);

        return [
            'enabled' => true,
            'context' => $context,
            'queue_uuid' => $resources['queue_uuid'] ?? null,
            'counter_uuid' => $resources['counter_uuid'] ?? null,
        ];
    }

    /**
     * @param  array<string, mixed>  $metadata
     * @return array<string, mixed>|null
     */
    protected function issue(
        Organization $organization,
        string $context,
        int $branchId,
        ?Patient $patient,
        array $metadata = [],
        string $priority = 'walk_in',
        string $source = 'api',
    ): ?array {
        $resources = $this->provisioner->ensure($organization, $context, $branchId);
        if (! $resources || empty($resources['queue_uuid'])) {
            Log::info('care.queue_issue_skipped_no_queue', [
                'context' => $context,
                'branch_id' => $branchId,
            ]);

            return null;
        }

        $owner = (string) $organization->owner_ref;

        try {
            return $this->queue->issueTicket($owner, [
                'service_queue_id' => $resources['queue_uuid'],
                'customer_name' => $patient?->fullName(),
                'customer_phone' => $patient?->phone,
                'priority' => $priority,
                'source' => $source,
                'metadata' => $metadata,
            ]);
        } catch (\Throwable $e) {
            Log::warning('care.queue_issue_failed', [
                'context' => $context,
                'branch_id' => $branchId,
                'message' => $e->getMessage(),
            ]);

            return null;
        }
    }

    /**
     * @param  array<string, mixed>  $ticket
     */
    protected function applyTicket(Model $entity, array $ticket): void
    {
        $entity->forceFill([
            'queue_ticket_uuid' => $ticket['uuid'] ?? $entity->getAttribute('queue_ticket_uuid'),
            'queue_ticket_number' => $ticket['ticket_number'] ?? $entity->getAttribute('queue_ticket_number'),
            'queue_ticket_status' => $ticket['status'] ?? $entity->getAttribute('queue_ticket_status'),
        ])->save();
    }

    /**
     * @return array<string, mixed>|null
     */
    protected function ticketAction(Organization $organization, Model $entity, string $action): ?array
    {
        $uuid = (string) $entity->getAttribute('queue_ticket_uuid');
        if ($uuid === '' || ! $this->isEnabled($organization)) {
            return null;
        }

        try {
            $ticket = $this->queue->ticketAction((string) $organization->owner_ref, $uuid, [
                'action' => $action,
            ]);
            $this->applyTicket($entity, $ticket);

            return $ticket;
        } catch (\Throwable $e) {
            Log::warning('care.queue_ticket_action_failed', [
                'action' => $action,
                'ticket_uuid' => $uuid,
                'message' => $e->getMessage(),
            ]);

            return null;
        }
    }

    protected function findEntityByTicket(Organization $organization, string $context, string $ticketUuid): ?Model
    {
        if ($ticketUuid === '') {
            return null;
        }

        $owner = (string) $organization->owner_ref;

        return match (true) {
            $context === CareQueueContexts::PHARMACY => Prescription::owned($owner)
                ->where('organization_id', $organization->id)
                ->where('queue_ticket_uuid', $ticketUuid)
                ->first(),
            $context === CareQueueContexts::LABORATORY => InvestigationRequest::owned($owner)
                ->where('organization_id', $organization->id)
                ->where('queue_ticket_uuid', $ticketUuid)
                ->first(),
            $context === CareQueueContexts::BILLING => Bill::owned($owner)
                ->where('organization_id', $organization->id)
                ->where('queue_ticket_uuid', $ticketUuid)
                ->first(),
            default => Appointment::owned($owner)
                ->where('organization_id', $organization->id)
                ->where('queue_ticket_uuid', $ticketUuid)
                ->first(),
        };
    }
}