<?php

namespace App\Http\Controllers\Care;

use App\Http\Controllers\Controller;
use App\Http\Controllers\Care\Concerns\ScopesToAccount;
use App\Models\Consultation;
use App\Models\Prescription;
use App\Models\Practitioner;
use App\Services\Care\OrganizationResolver;
use App\Services\Care\PharmacyService;
use App\Services\Care\PrescriptionService;
use Illuminate\Http\RedirectResponse;
use Illuminate\Http\Request;
use Illuminate\View\View;

class PrescriptionController extends Controller
{
    use ScopesToAccount;

    public function __construct(
        protected PrescriptionService $prescriptions,
        protected PharmacyService $pharmacy,
    ) {}

    public function index(Request $request): View
    {
        $this->authorizeAbility($request, 'prescriptions.view');
        $organization = $this->organization($request);
        $branchScope = app(OrganizationResolver::class)->branchScope($this->member($request));

        $prescriptions = $this->prescriptions->list(
            $this->ownerRef($request),
            $organization->id,
            $request->only(['status', 'patient_id']),
            $branchScope,
        );

        return view('care.prescriptions.index', [
            'organization' => $organization,
            'prescriptions' => $prescriptions,
            'statuses' => config('care.prescription_statuses'),
        ]);
    }

    public function queue(Request $request): View
    {
        $this->authorizeAbility($request, 'prescriptions.view');
        $organization = $this->organization($request);

        $queue = $this->prescriptions->pharmacyQueue($this->ownerRef($request), $organization->id);

        $drugs = \App\Models\Drug::owned($this->ownerRef($request))
            ->where('organization_id', $organization->id)
            ->where('is_active', true)
            ->with(['batches' => fn ($q) => $q->where('quantity_on_hand', '>', 0)->orderBy('expiry_date')])
            ->orderBy('name')
            ->get();

        $canDispense = app(\App\Services\Care\CarePermissions::class)
            ->can($this->member($request), 'prescriptions.dispense');

        return view('care.prescriptions.queue', [
            'organization' => $organization,
            'queue' => $queue,
            'drugs' => $drugs,
            'canDispense' => $canDispense,
        ]);
    }

    public function create(Request $request, Consultation $consultation): View
    {
        $this->authorizeAbility($request, 'prescriptions.manage');
        $this->authorizeConsultation($request, $consultation);

        $consultation->load(['patient', 'practitioner']);

        $practitioners = Practitioner::owned($this->ownerRef($request))
            ->where('organization_id', $this->organization($request)->id)
            ->where('is_active', true)
            ->orderBy('name')
            ->get();

        return view('care.prescriptions.create', [
            'consultation' => $consultation,
            'practitioners' => $practitioners,
            'routes' => config('care.medication_routes'),
        ]);
    }

    public function store(Request $request, Consultation $consultation): RedirectResponse
    {
        $this->authorizeAbility($request, 'prescriptions.manage');
        $this->authorizeConsultation($request, $consultation);

        $prescription = $this->prescriptions->createFromConsultation(
            $consultation,
            $this->ownerRef($request),
            $this->validatedPrescriptionData($request),
            $this->ownerRef($request),
        );

        return redirect()->route('care.prescriptions.show', $prescription)
            ->with('success', 'Prescription created.');
    }

    public function show(Request $request, Prescription $prescription): View
    {
        $this->authorizeAbility($request, 'prescriptions.view');
        $this->authorizePrescription($request, $prescription);

        $prescription->load(['patient', 'practitioner', 'items', 'consultation', 'visit']);

        $canManage = app(\App\Services\Care\CarePermissions::class)
            ->can($this->member($request), 'prescriptions.manage');
        $canDispense = app(\App\Services\Care\CarePermissions::class)
            ->can($this->member($request), 'prescriptions.dispense');

        return view('care.prescriptions.show', [
            'prescription' => $prescription,
            'statuses' => config('care.prescription_statuses'),
            'routes' => config('care.medication_routes'),
            'canManage' => $canManage,
            'canDispense' => $canDispense,
        ]);
    }

    public function activate(Request $request, Prescription $prescription): RedirectResponse
    {
        $this->authorizeAbility($request, 'prescriptions.manage');
        $this->authorizePrescription($request, $prescription);

        $this->prescriptions->activate($prescription, $this->ownerRef($request), $this->ownerRef($request));

        return back()->with('success', 'Prescription activated.');
    }

    public function dispense(Request $request, Prescription $prescription): RedirectResponse
    {
        $this->authorizeAbility($request, 'prescriptions.dispense');
        $this->authorizePrescription($request, $prescription);

        $allocations = $request->input('allocations', []);

        if (! empty($allocations)) {
            $this->pharmacy->dispensePrescription(
                $prescription,
                $this->ownerRef($request),
                $allocations,
                $this->ownerRef($request),
            );
        } else {
            $this->prescriptions->dispense($prescription, $this->ownerRef($request), $this->ownerRef($request));
        }

        return redirect()->route('care.prescriptions.queue')
            ->with('success', 'Prescription dispensed.');
    }

    public function cancel(Request $request, Prescription $prescription): RedirectResponse
    {
        $this->authorizeAbility($request, 'prescriptions.manage');
        $this->authorizePrescription($request, $prescription);

        $this->prescriptions->cancel($prescription, $this->ownerRef($request), $this->ownerRef($request));

        return back()->with('success', 'Prescription cancelled.');
    }

    protected function authorizeConsultation(Request $request, Consultation $consultation): void
    {
        $this->authorizeOwner($request, $consultation);
        $consultation->loadMissing('visit');
        abort_unless($consultation->visit->organization_id === $this->organization($request)->id, 404);
    }

    protected function authorizePrescription(Request $request, Prescription $prescription): void
    {
        $this->authorizeOwner($request, $prescription);
        abort_unless($prescription->organization_id === $this->organization($request)->id, 404);

        $branchId = app(OrganizationResolver::class)->branchScope($this->member($request));
        if ($branchId !== null) {
            $prescription->loadMissing('visit');
            abort_unless($prescription->visit->branch_id === $branchId, 404);
        }
    }

    /**
     * @return array<string, mixed>
     */
    protected function validatedPrescriptionData(Request $request): array
    {
        return $request->validate([
            'practitioner_id' => ['nullable', 'integer', 'exists:care_practitioners,id'],
            'notes' => ['nullable', 'string', 'max:5000'],
            'activate' => ['nullable', 'boolean'],
            'items' => ['required', 'array', 'min:1'],
            'items.*.is_procedure' => ['nullable', 'boolean'],
            'items.*.name' => ['required', 'string', 'max:255'],
            'items.*.dosage' => ['nullable', 'string', 'max:100'],
            'items.*.frequency' => ['nullable', 'string', 'max:100'],
            'items.*.duration' => ['nullable', 'string', 'max:100'],
            'items.*.route' => ['nullable', 'string', 'max:50'],
            'items.*.quantity' => ['nullable', 'string', 'max:50'],
            'items.*.instructions' => ['nullable', 'string', 'max:2000'],
        ]);
    }
}