<?php

namespace App\Services\Care;

use App\Models\Appointment;
use App\Models\Bill;
use App\Models\Department;
use App\Models\Member;
use App\Models\Organization;
use App\Models\Patient;
use App\Models\Visit;
use Illuminate\Support\Collection;

/**
 * Shared specialty module shell — KPIs, Visit-backed lists, stage maps, service catalogs.
 */
class SpecialtyShellService
{
    public function __construct(
        protected SpecialtyModuleService $modules,
        protected BillService $bills,
    ) {}

    /**
     * @return array<string, mixed>
     */
    public function definition(string $moduleKey): array
    {
        $base = $this->modules->definition($moduleKey) ?? [];
        $shell = config("care_specialty_shell.modules.{$moduleKey}", []);
        $defaults = config('care_specialty_shell.defaults', []);

        return array_merge($defaults, $base, is_array($shell) ? $shell : []);
    }

    /**
     * @return list<array{code: string, label: string, queue_point: ?string}>
     */
    public function stages(string $moduleKey): array
    {
        $stages = $this->definition($moduleKey)['stages'] ?? [];

        return is_array($stages) ? array_values($stages) : [];
    }

    /**
     * Catalog from config (authoritative template).
     *
     * @return list<array{code: string, label: string, amount_minor: int, type: string}>
     */
    public function catalogServices(string $moduleKey): array
    {
        $services = $this->definition($moduleKey)['services'] ?? [];
        if (! is_array($services)) {
            return [];
        }

        return array_values(array_map(function ($row) {
            return [
                'code' => (string) ($row['code'] ?? ''),
                'label' => (string) ($row['label'] ?? ''),
                'amount_minor' => (int) ($row['amount_minor'] ?? 0),
                'type' => (string) ($row['type'] ?? 'misc'),
            ];
        }, $services));
    }

    /**
     * Seeded services stored on the organization when the module was activated.
     *
     * @return list<array{code: string, label: string, amount_minor: int, type: string}>
     */
    public function provisionedServices(Organization $organization, string $moduleKey): array
    {
        $stored = data_get($organization->settings, "specialty_module_provisioning.{$moduleKey}.services");
        if (is_array($stored) && $stored !== []) {
            return array_values($stored);
        }

        return $this->catalogServices($moduleKey);
    }

    /**
     * Persist catalog services onto org settings (idempotent merge by code).
     *
     * @return list<array{code: string, label: string, amount_minor: int, type: string}>
     */
    public function seedServices(Organization $organization, string $moduleKey): array
    {
        $catalog = $this->catalogServices($moduleKey);
        $settings = $organization->settings ?? [];
        $provisioning = is_array($settings['specialty_module_provisioning'] ?? null)
            ? $settings['specialty_module_provisioning']
            : [];
        $record = is_array($provisioning[$moduleKey] ?? null) ? $provisioning[$moduleKey] : [];
        $existing = collect(is_array($record['services'] ?? null) ? $record['services'] : [])
            ->keyBy(fn ($s) => (string) ($s['code'] ?? ''));

        foreach ($catalog as $service) {
            if ($service['code'] === '') {
                continue;
            }
            $prior = $existing->get($service['code'], []);
            $existing->put($service['code'], array_merge(is_array($prior) ? $prior : [], $service));
        }

        $merged = $existing->filter(fn ($s, $code) => $code !== '')->values()->all();
        $record['services'] = $merged;
        $provisioning[$moduleKey] = $record;
        $settings['specialty_module_provisioning'] = $provisioning;
        $organization->update(['settings' => $settings]);

        return $merged;
    }

    /**
     * @return array<string, string>
     */
    public function workspaceTabs(string $moduleKey): array
    {
        $tabs = $this->definition($moduleKey)['workspace_tabs'] ?? [];

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

    /**
     * @return array<string, string>
     */
    public function actions(string $moduleKey): array
    {
        $actions = $this->definition($moduleKey)['actions'] ?? [];

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

    /**
     * @return list<int>
     */
    public function departmentIds(
        Organization $organization,
        string $moduleKey,
        string $ownerRef,
        ?int $branchScope = null,
    ): array {
        $definition = $this->modules->definition($moduleKey);
        if (! $definition) {
            return [];
        }

        $fromSettings = data_get($organization->settings, "specialty_module_provisioning.{$moduleKey}.department_ids", []);
        if (is_array($fromSettings) && $fromSettings !== []) {
            $ids = array_map('intval', $fromSettings);
        } else {
            $ids = Department::owned($ownerRef)
                ->where('organization_id', $organization->id)
                ->where('type', $definition['department_type'] ?? 'general')
                ->where('is_active', true)
                ->when($branchScope, fn ($q) => $q->where('branch_id', $branchScope))
                ->pluck('id')
                ->map(fn ($id) => (int) $id)
                ->all();
        }

        if ($branchScope) {
            $ids = Department::owned($ownerRef)
                ->whereIn('id', $ids ?: [0])
                ->where('branch_id', $branchScope)
                ->pluck('id')
                ->map(fn ($id) => (int) $id)
                ->all();
        }

        return $ids;
    }

    /**
     * @param  list<int>|null  $practitionerScope
     * @return array{
     *     waiting: int,
     *     in_progress: int,
     *     completed_today: int,
     *     open_visits: int,
     *     revenue_today_minor: int,
     *     stages: list<array{code: string, label: string, count: int}>
     * }
     */
    public function kpis(
        Organization $organization,
        string $moduleKey,
        string $ownerRef,
        ?int $branchScope = null,
        ?array $practitionerScope = null,
    ): array {
        $departmentIds = $this->departmentIds($organization, $moduleKey, $ownerRef, $branchScope);
        $todayStart = now()->startOfDay();

        $appointmentBase = Appointment::owned($ownerRef)
            ->where('organization_id', $organization->id)
            ->when($departmentIds !== [], fn ($q) => $q->whereIn('department_id', $departmentIds))
            ->when($departmentIds === [], fn ($q) => $q->whereRaw('1 = 0'))
            ->when($branchScope, fn ($q) => $q->where('branch_id', $branchScope))
            ->when(
                $practitionerScope !== null,
                fn ($q) => $q->whereIn('practitioner_id', $practitionerScope ?: [0]),
            );

        $waiting = (clone $appointmentBase)
            ->whereIn('status', [Appointment::STATUS_WAITING, Appointment::STATUS_CHECKED_IN])
            ->count();

        $inProgress = (clone $appointmentBase)
            ->where('status', Appointment::STATUS_IN_CONSULTATION)
            ->count();

        $completedToday = (clone $appointmentBase)
            ->where('status', Appointment::STATUS_COMPLETED)
            ->where('completed_at', '>=', $todayStart)
            ->count();

        $visitIds = (clone $appointmentBase)->whereNotNull('visit_id')->pluck('visit_id');

        $openVisits = Visit::owned($ownerRef)
            ->where('organization_id', $organization->id)
            ->whereIn('id', $visitIds->isEmpty() ? [0] : $visitIds)
            ->whereIn('status', [Visit::STATUS_OPEN, Visit::STATUS_IN_PROGRESS])
            ->count();

        $revenueToday = (int) Bill::owned($ownerRef)
            ->where('organization_id', $organization->id)
            ->whereIn('visit_id', $visitIds->isEmpty() ? [0] : $visitIds)
            ->where('created_at', '>=', $todayStart)
            ->whereNotIn('status', [Bill::STATUS_VOID])
            ->sum('amount_paid_minor');

        $stages = collect($this->stages($moduleKey))->map(function (array $stage) use ($waiting, $inProgress, $completedToday) {
            $code = (string) ($stage['code'] ?? '');
            $count = match (true) {
                in_array($code, ['waiting', 'arrival', 'request'], true) => $waiting,
                in_array($code, ['in_care', 'chair', 'procedure', 'treatment', 'resus', 'crossmatch', 'issue', 'observation'], true) => $inProgress,
                in_array($code, ['completed', 'disposition', 'transfusion', 'recovery'], true) => $completedToday,
                default => 0,
            };

            return [
                'code' => $code,
                'label' => (string) ($stage['label'] ?? $code),
                'count' => $count,
            ];
        })->all();

        $clinical = app(SpecialtyClinicalRecordService::class);
        $clinicalOpen = match ($moduleKey) {
            'emergency' => $clinical->countOpenByType($organization, 'emergency', 'triage', $branchScope),
            'blood_bank' => $clinical->countOpenByType($organization, 'blood_bank', 'blood_request', $branchScope),
            'dentistry' => $clinical->countOpenByType($organization, 'dentistry', 'odontogram', $branchScope),
            default => 0,
        };

        return [
            'waiting' => $waiting,
            'in_progress' => $inProgress,
            'completed_today' => $completedToday,
            'open_visits' => $openVisits,
            'revenue_today_minor' => $revenueToday,
            'clinical_open' => $clinicalOpen,
            'stages' => $stages,
        ];
    }

    /**
     * @param  list<int>|null  $practitionerScope
     * @return Collection<int, Visit>
     */
    public function openVisits(
        Organization $organization,
        string $moduleKey,
        string $ownerRef,
        ?int $branchScope = null,
        ?array $practitionerScope = null,
        int $limit = 40,
    ): Collection {
        $departmentIds = $this->departmentIds($organization, $moduleKey, $ownerRef, $branchScope);

        return Visit::owned($ownerRef)
            ->where('organization_id', $organization->id)
            ->whereIn('status', [Visit::STATUS_OPEN, Visit::STATUS_IN_PROGRESS])
            ->when($branchScope, fn ($q) => $q->where('branch_id', $branchScope))
            ->whereHas('appointment', function ($q) use ($departmentIds, $practitionerScope) {
                $q->when($departmentIds !== [], fn ($qq) => $qq->whereIn('department_id', $departmentIds))
                    ->when($departmentIds === [], fn ($qq) => $qq->whereRaw('1 = 0'))
                    ->when(
                        $practitionerScope !== null,
                        fn ($qq) => $qq->whereIn('practitioner_id', $practitionerScope ?: [0]),
                    );
            })
            ->with(['patient', 'appointment.practitioner', 'appointment.department', 'bill'])
            ->orderByDesc('checked_in_at')
            ->limit($limit)
            ->get();
    }

    /**
     * @param  list<int>|null  $practitionerScope
     * @return Collection<int, Visit>
     */
    public function visitHistory(
        Organization $organization,
        string $moduleKey,
        string $ownerRef,
        ?int $branchScope = null,
        ?array $practitionerScope = null,
        int $limit = 40,
    ): Collection {
        $departmentIds = $this->departmentIds($organization, $moduleKey, $ownerRef, $branchScope);

        return Visit::owned($ownerRef)
            ->where('organization_id', $organization->id)
            ->where('status', Visit::STATUS_COMPLETED)
            ->when($branchScope, fn ($q) => $q->where('branch_id', $branchScope))
            ->whereHas('appointment', function ($q) use ($departmentIds, $practitionerScope) {
                $q->when($departmentIds !== [], fn ($qq) => $qq->whereIn('department_id', $departmentIds))
                    ->when($departmentIds === [], fn ($qq) => $qq->whereRaw('1 = 0'))
                    ->when(
                        $practitionerScope !== null,
                        fn ($qq) => $qq->whereIn('practitioner_id', $practitionerScope ?: [0]),
                    );
            })
            ->with(['patient', 'appointment.practitioner', 'appointment.department', 'bill'])
            ->orderByDesc('completed_at')
            ->limit($limit)
            ->get();
    }

    /**
     * @return list<array{at: string, label: string, detail: ?string}>
     */
    public function patientTimeline(Patient $patient, int $limit = 20): array
    {
        $patient->loadMissing([
            'visits' => fn ($q) => $q->orderByDesc('checked_in_at')->limit(10),
            'appointments' => fn ($q) => $q->orderByDesc('scheduled_at')->limit(10),
            'bills' => fn ($q) => $q->orderByDesc('created_at')->limit(10),
        ]);

        $events = collect();

        foreach ($patient->visits as $visit) {
            if ($visit->checked_in_at) {
                $events->push([
                    'at' => $visit->checked_in_at->toIso8601String(),
                    'label' => 'Visit opened',
                    'detail' => 'Visit '.$visit->uuid,
                ]);
            }
            if ($visit->completed_at) {
                $events->push([
                    'at' => $visit->completed_at->toIso8601String(),
                    'label' => 'Visit completed',
                    'detail' => null,
                ]);
            }
        }

        foreach ($patient->appointments as $appointment) {
            if ($appointment->waiting_at) {
                $events->push([
                    'at' => $appointment->waiting_at->toIso8601String(),
                    'label' => 'Joined waiting list',
                    'detail' => $appointment->queue_ticket_number
                        ? 'Ticket '.$appointment->queue_ticket_number
                        : null,
                ]);
            }
            if ($appointment->started_at) {
                $events->push([
                    'at' => $appointment->started_at->toIso8601String(),
                    'label' => 'Consultation started',
                    'detail' => $appointment->practitioner?->name,
                ]);
            }
            if ($appointment->completed_at) {
                $events->push([
                    'at' => $appointment->completed_at->toIso8601String(),
                    'label' => 'Consultation completed',
                    'detail' => null,
                ]);
            }
        }

        foreach ($patient->bills as $bill) {
            $events->push([
                'at' => $bill->created_at?->toIso8601String() ?? now()->toIso8601String(),
                'label' => 'Invoice '.$bill->invoice_number,
                'detail' => strtoupper((string) $bill->status),
            ]);
        }

        return $events
            ->sortByDesc('at')
            ->take($limit)
            ->values()
            ->all();
    }

    /**
     * @return array{
     *     outstanding_minor: int,
     *     allergies: list<string>,
     *     insurance_summary: ?string,
     *     emergency: bool
     * }
     */
    public function patientHeaderMeta(Patient $patient): array
    {
        $patient->loadMissing(['allergies', 'insurancePolicies', 'emergencyContacts']);

        $outstanding = (int) Bill::owned($patient->owner_ref)
            ->where('patient_id', $patient->id)
            ->whereIn('status', [Bill::STATUS_OPEN, Bill::STATUS_PARTIAL, Bill::STATUS_DRAFT])
            ->sum('balance_minor');

        $allergies = $patient->allergies->map(fn ($a) => (string) $a->allergen)->filter()->values()->all();

        $policy = $patient->insurancePolicies->first();
        $insurance = $policy
            ? trim(implode(' · ', array_filter([(string) ($policy->provider_name ?? ''), (string) ($policy->policy_number ?? '')])))
            : null;

        return [
            'outstanding_minor' => $outstanding,
            'allergies' => $allergies,
            'insurance_summary' => $insurance !== '' ? $insurance : null,
            'emergency' => $patient->emergencyContacts->isNotEmpty(),
        ];
    }

    public function addCatalogServiceToVisit(
        Organization $organization,
        Visit $visit,
        string $moduleKey,
        string $serviceCode,
        string $ownerRef,
        ?string $actorRef = null,
    ): Bill {
        $service = collect($this->provisionedServices($organization, $moduleKey))
            ->first(fn ($s) => ($s['code'] ?? '') === $serviceCode);

        if (! $service) {
            throw new \InvalidArgumentException("Unknown specialty service [{$serviceCode}].");
        }

        $bill = $this->bills->generateFromVisit($visit, $ownerRef, $actorRef);

        return $this->bills->addManualLineItem($bill, $ownerRef, [
            'type' => $service['type'] ?? 'misc',
            'description' => $service['label'],
            'quantity' => 1,
            'unit_price_minor' => (int) ($service['amount_minor'] ?? 0),
            'source_type' => 'specialty_service',
            'source_id' => null,
        ], $actorRef);
    }

    public function navItems(string $moduleKey): array
    {
        return [
            'overview' => ['label' => 'Overview', 'route' => 'care.specialty.show'],
            'visits' => ['label' => 'Visits', 'route' => 'care.specialty.visits'],
            'history' => ['label' => 'History', 'route' => 'care.specialty.history'],
            'billing' => ['label' => 'Billing', 'route' => 'care.specialty.billing'],
            'workspace' => ['label' => 'Workspace', 'route' => 'care.specialty.workspace'],
        ];
    }

    public function memberCanAccess(Organization $organization, ?Member $member, string $moduleKey): bool
    {
        return $this->modules->memberCanAccess($organization, $member, $moduleKey);
    }
}