<?php

namespace App\Services\Care;

use App\Models\Branch;
use App\Models\Member;
use App\Models\Organization;
use App\Services\Queue\QueueClient;
use Illuminate\Http\Client\RequestException;
use Illuminate\Http\Request;

/**
 * Loads Ladill Queue console state for embedding on role-native pages
 * (clinical queue, pharmacy, lab, specialty modules) instead of a standalone Service Queues nav.
 */
class ServiceQueuePresenter
{
    /** @var array<string, list<string>> */
    protected array $contextKeywords = [
        'clinical' => ['reception', 'consult', 'outpatient', 'general', 'doctor', 'nurse', 'triage', 'waiting'],
        'pharmacy' => ['pharm', 'dispens', 'drug', 'rx'],
        'laboratory' => ['lab', 'sample', 'patholog', 'investig'],
        'dentistry' => ['dent', 'dental', 'oral'],
        'ophthalmology' => ['eye', 'ophthal', 'optom'],
        'physiotherapy' => ['physio', 'rehab', 'therapy'],
        'maternity' => ['matern', 'antenatal', 'obstetric'],
        'radiology' => ['radio', 'imaging', 'x-ray', 'xray', 'ultrasound', 'ct', 'mri'],
    ];

    public function __construct(
        protected QueueClient $queue,
        protected CarePermissions $permissions,
        protected PlanService $plans,
        protected OrganizationResolver $resolver,
    ) {}

    /**
     * @return array{
     *     enabled: bool,
     *     counters: list<array<string, mixed>>,
     *     counter_uuid: ?string,
     *     state: ?array<string, mixed>,
     *     stubs: list<array<string, mixed>>,
     *     error: ?string,
     *     context: string
     * }|null
     */
    public function panel(
        Request $request,
        Organization $organization,
        ?Member $member,
        string $context = 'clinical',
        ?string $preferredCounterUuid = null,
    ): ?array {
        if (! $this->shouldShow($organization, $member)) {
            return null;
        }

        $owner = (string) $organization->owner_ref;
        $branchScope = $this->resolver->branchScope($member);
        $branchName = null;
        if ($branchScope) {
            $branchName = Branch::owned($owner)->where('id', $branchScope)->value('name');
        }

        $stubs = $this->stubsForContext($organization, $context, $branchScope);

        if (! $this->queue->configured()) {
            return [
                'enabled' => true,
                'counters' => [],
                'counter_uuid' => null,
                'state' => null,
                'stubs' => $stubs,
                'error' => 'Ladill Queue API is not configured on this Care instance.',
                'context' => $context,
            ];
        }

        try {
            $counters = $this->queue->counters($owner);
        } catch (RequestException $e) {
            if ($e->response?->status() === 403) {
                try {
                    $this->queue->syncIntegration($owner, true);
                    $counters = $this->queue->counters($owner);
                } catch (RequestException) {
                    return [
                        'enabled' => true,
                        'counters' => [],
                        'counter_uuid' => null,
                        'state' => null,
                        'stubs' => $stubs,
                        'error' => 'Queue integration is not linked. Re-save Settings with Queue enabled.',
                        'context' => $context,
                    ];
                }
            } else {
                return [
                    'enabled' => true,
                    'counters' => [],
                    'counter_uuid' => null,
                    'state' => null,
                    'stubs' => $stubs,
                    'error' => 'Could not reach Ladill Queue.',
                    'context' => $context,
                ];
            }
        }

        $stubCounterUuid = collect($stubs)
            ->map(fn ($s) => (string) ($s['counter_uuid'] ?? ''))
            ->first(fn ($uuid) => $uuid !== '');

        $counters = $this->filterCounters($counters, $branchName, $context, $stubCounterUuid);
        $counterUuid = $preferredCounterUuid
            ?: ($stubCounterUuid ?: '')
            ?: (string) ($counters[0]['uuid'] ?? '');

        if ($counterUuid !== '' && ! collect($counters)->contains(fn ($c) => ($c['uuid'] ?? '') === $counterUuid)) {
            $counterUuid = (string) ($counters[0]['uuid'] ?? '');
        }

        $state = null;
        if ($counterUuid !== '') {
            try {
                $state = $this->queue->console($owner, $counterUuid);
            } catch (RequestException) {
                return [
                    'enabled' => true,
                    'counters' => $counters,
                    'counter_uuid' => $counterUuid,
                    'state' => null,
                    'stubs' => $stubs,
                    'error' => 'Counter console unavailable.',
                    'context' => $context,
                ];
            }
        }

        return [
            'enabled' => true,
            'counters' => $counters,
            'counter_uuid' => $counterUuid !== '' ? $counterUuid : null,
            'state' => $state,
            'stubs' => $stubs,
            'error' => null,
            'context' => $context,
        ];
    }

    public function shouldShow(Organization $organization, ?Member $member): bool
    {
        if (! $member) {
            return false;
        }

        if (! $this->plans->canUseQueueIntegration($organization)) {
            return false;
        }

        if (! data_get($organization->settings, 'queue_integration_enabled')) {
            return false;
        }

        return $this->permissions->can($member, 'service_queues.console');
    }

    /**
     * @param  list<array<string, mixed>>  $counters
     * @return list<array<string, mixed>>
     */
    protected function filterCounters(
        array $counters,
        ?string $branchName,
        string $context,
        ?string $preferredUuid = null,
    ): array {
        $all = collect($counters);
        $filtered = $all;

        if ($preferredUuid) {
            $linked = $all->first(fn ($c) => ($c['uuid'] ?? '') === $preferredUuid);
            if ($linked) {
                return [$linked];
            }
        }

        if ($branchName) {
            $branchFiltered = $filtered->filter(function ($counter) use ($branchName) {
                $counterBranch = (string) ($counter['branch'] ?? '');

                return $counterBranch === '' || strcasecmp($counterBranch, $branchName) === 0;
            });
            if ($branchFiltered->isNotEmpty()) {
                $filtered = $branchFiltered;
            }
        }

        $keywords = $this->keywordsFor($context);
        if ($keywords !== []) {
            $keywordFiltered = $filtered->filter(function ($counter) use ($keywords) {
                $queueNames = collect($counter['queues'] ?? [])->map(function ($q) {
                    return is_array($q) ? (string) ($q['name'] ?? '') : (string) $q;
                })->implode(' ');

                $haystack = strtolower(implode(' ', [
                    (string) ($counter['name'] ?? ''),
                    $queueNames,
                ]));

                foreach ($keywords as $keyword) {
                    if ($keyword !== '' && str_contains($haystack, $keyword)) {
                        return true;
                    }
                }

                return false;
            });

            // Fall back to branch-scoped counters when no keyword match (demo / generic counters).
            if ($keywordFiltered->isNotEmpty()) {
                $filtered = $keywordFiltered;
            }
        }

        return $filtered->values()->all();
    }

    /**
     * @return list<string>
     */
    protected function keywordsFor(string $context): array
    {
        if (isset($this->contextKeywords[$context])) {
            return $this->contextKeywords[$context];
        }

        $module = config("care.specialty_modules.{$context}.queue_keywords");

        return is_array($module) ? $module : [];
    }

    /**
     * @return list<array<string, mixed>>
     */
    protected function stubsForContext(Organization $organization, string $context, ?int $branchId): array
    {
        if (! array_key_exists($context, config('care.specialty_modules', []))) {
            return [];
        }

        $queues = data_get($organization->settings, "specialty_module_provisioning.{$context}.queues", []);
        if (! is_array($queues)) {
            return [];
        }

        return array_values(array_filter($queues, function ($queue) use ($branchId) {
            if (! ($queue['active'] ?? false)) {
                return false;
            }
            if ($branchId !== null && (int) ($queue['branch_id'] ?? 0) !== $branchId) {
                return false;
            }

            return true;
        }));
    }
}