<?php

namespace App\Http\Controllers\Care;

use App\Http\Controllers\Care\Concerns\ScopesToAccount;
use App\Http\Controllers\Controller;
use App\Models\Appointment;
use App\Models\Branch;
use App\Models\Department;
use App\Models\Organization;
use App\Models\Patient;
use App\Models\Practitioner;
use App\Services\Care\AdminOverviewService;
use App\Services\Care\AppointmentService;
use App\Services\Care\CareFeatures;
use App\Services\Care\CarePermissions;
use App\Services\Care\OrganizationResolver;
use App\Services\Care\Workflow\WorkflowEngine;
use App\Services\Care\Workflow\WorkflowQueueGate;
use Illuminate\Database\Eloquent\Collection;
use Illuminate\Http\RedirectResponse;
use Illuminate\Http\Request;
use Illuminate\View\View;

class AppointmentController extends Controller
{
    use ScopesToAccount;

    public function __construct(
        protected AppointmentService $appointments,
        protected AdminOverviewService $adminOverview,
    ) {}

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

        if ($permissions->isAdmin($member) && $request->query('view') !== 'list') {
            return view('care.admin.analytics', [
                'title' => 'Appointments',
                'badge' => 'Analytics · Throughput',
                'description' => 'Scheduling, waiting, and completion rates across the facility.',
                'adminOverview' => $this->adminOverview->appointments(
                    $organization,
                    $this->ownerRef($request),
                    $branchScope,
                ),
            ]);
        }

        $filters = $request->only(['status', 'practitioner_id', 'date', 'patient_id']);
        if ($practitionerScope !== null) {
            unset($filters['practitioner_id']);
        }

        $appointments = $this->appointments->list(
            $this->ownerRef($request),
            $organization->id,
            $filters,
            $practitionerScope === null ? $branchScope : null,
            $practitionerScope,
        );

        $practitioners = $practitionerScope === null
            ? $this->activePractitioners($request, $organization->id)
            : collect();

        $owner = $this->ownerRef($request);
        $appointmentQuery = Appointment::owned($owner)
            ->where('organization_id', $organization->id);
        if ($practitionerScope !== null) {
            $appointmentQuery->whereIn('practitioner_id', $practitionerScope ?: [0]);
        } elseif ($branchScope) {
            $appointmentQuery->where('branch_id', $branchScope);
        }

        $heroStats = [
            'today' => (clone $appointmentQuery)->whereDate('scheduled_at', today())->count(),
            'scheduled' => (clone $appointmentQuery)->where('status', Appointment::STATUS_SCHEDULED)->count(),
            'waiting' => (clone $appointmentQuery)->whereIn('status', [
                Appointment::STATUS_CHECKED_IN,
                Appointment::STATUS_WAITING,
            ])->count(),
        ];

        return view('care.appointments.index', [
            'organization' => $organization,
            'appointments' => $appointments,
            'practitioners' => $practitioners,
            'lockToPractitioner' => $practitionerScope !== null,
            'statuses' => config('care.appointment_statuses'),
            'heroStats' => $heroStats,
        ]);
    }

    public function create(Request $request): View
    {
        $this->authorizeAbility($request, 'appointments.manage');
        $organization = $this->organization($request);

        return view('care.appointments.create', $this->formData($request, $organization));
    }

    public function store(Request $request): RedirectResponse
    {
        $this->authorizeAbility($request, 'appointments.manage');
        $organization = $this->organization($request);
        $validated = $this->validatedAppointmentData($request);

        $appointment = $this->appointments->book(
            $organization,
            $this->ownerRef($request),
            $validated,
            $this->ownerRef($request),
        );

        return redirect()->route('care.appointments.show', $appointment)
            ->with('success', 'Appointment booked.');
    }

    public function walkInCreate(Request $request): View
    {
        $this->authorizeAbility($request, 'appointments.manage');
        $organization = $this->organization($request);

        return view('care.appointments.walk-in', $this->formData($request, $organization));
    }

    public function walkInStore(Request $request): RedirectResponse
    {
        $this->authorizeAbility($request, 'appointments.manage');
        $organization = $this->organization($request);
        $validated = $this->validatedWalkInData($request);

        $appointment = $this->appointments->walkIn(
            $organization,
            $this->ownerRef($request),
            $validated,
            $this->ownerRef($request),
        );

        if (app(CareFeatures::class)->enabled($organization, CareFeatures::WORKFLOW_ENGINE)) {
            return redirect()->route('care.appointments.show', $appointment)
                ->with('success', 'Walk-in checked in. Complete the current patient journey stage before Queue release.');
        }

        return redirect()->route('care.queue.index')
            ->with('success', 'Walk-in added to queue.');
    }

    public function show(Request $request, Appointment $appointment): View
    {
        $this->authorizeAbility($request, 'appointments.view');
        $this->authorizeAppointment($request, $appointment);

        $appointment->load(['patient', 'practitioner', 'branch', 'department', 'visit', 'consultation']);

        $canManage = app(CarePermissions::class)
            ->can($this->member($request), 'appointments.manage');
        $canConsult = app(CarePermissions::class)
            ->can($this->member($request), 'consultations.manage');
        $canViewBills = app(CarePermissions::class)
            ->can($this->member($request), 'bills.view');
        $organization = $this->organization($request);
        $workflowEnabled = $appointment->visit
            && app(CareFeatures::class)->enabled($organization, CareFeatures::WORKFLOW_ENGINE);
        $workflowEngine = app(WorkflowEngine::class);
        $currentAdvance = $workflowEnabled
            ? $workflowEngine->refreshGate($appointment->visit)
            : null;
        $currentObligation = $currentAdvance?->stage
            ? $appointment->visit->financialObligations()
                ->where('workflow_stage_id', $currentAdvance->stage->id)
                ->latest('id')
                ->first()
            : null;
        $canStartConsultation = $canConsult && (! $workflowEnabled || app(WorkflowQueueGate::class)->canRelease(
            $organization,
            $appointment->visit,
            $this->appointments->queueContextFor($organization, $appointment),
        ));

        return view('care.appointments.show', [
            'appointment' => $appointment,
            'statuses' => config('care.appointment_statuses'),
            'canManage' => $canManage,
            'canConsult' => $canConsult,
            'canViewBills' => $canViewBills,
            'canStartConsultation' => $canStartConsultation,
            'workflowEnabled' => $workflowEnabled,
            'currentAdvance' => $currentAdvance,
            'currentObligation' => $currentObligation,
            'workflowHistory' => $workflowEnabled
                ? $appointment->visit->stageAdvances()->with('stage')->orderBy('id')->get()
                : collect(),
            'canAdvanceWorkflow' => $canManage
                && $workflowEnabled
                && $workflowEngine->canManuallyAdvance($appointment->visit),
        ]);
    }

    public function checkIn(Request $request, Appointment $appointment): RedirectResponse
    {
        $this->authorizeAbility($request, 'appointments.manage');
        $this->authorizeAppointment($request, $appointment);

        $appointment = $this->appointments->checkIn($appointment, $this->ownerRef($request), $this->ownerRef($request));

        if (app(CareFeatures::class)->enabled($this->organization($request), CareFeatures::WORKFLOW_ENGINE)) {
            return redirect()->route('care.appointments.show', $appointment)
                ->with('success', 'Patient checked in. Complete the current patient journey stage before Queue release.');
        }

        return redirect()->route('care.queue.index')
            ->with('success', 'Patient checked in and added to queue.');
    }

    public function cancel(Request $request, Appointment $appointment): RedirectResponse
    {
        $this->authorizeAbility($request, 'appointments.manage');
        $this->authorizeAppointment($request, $appointment);

        $this->appointments->cancel($appointment, $this->ownerRef($request), $this->ownerRef($request));

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

    public function noShow(Request $request, Appointment $appointment): RedirectResponse
    {
        $this->authorizeAbility($request, 'appointments.manage');
        $this->authorizeAppointment($request, $appointment);

        $this->appointments->markNoShow($appointment, $this->ownerRef($request), $this->ownerRef($request));

        return back()->with('success', 'Marked as no-show.');
    }

    protected function authorizeAppointment(Request $request, Appointment $appointment): void
    {
        $this->authorizeOwner($request, $appointment);
        abort_unless($appointment->organization_id === $this->organization($request)->id, 404);

        $branchId = app(OrganizationResolver::class)->branchScope($this->member($request));
        if ($branchId !== null && $appointment->branch_id !== $branchId) {
            abort(404);
        }
    }

    /**
     * @return array<string, mixed>
     */
    protected function formData(Request $request, Organization $organization): array
    {
        $ownerRef = $this->ownerRef($request);
        $branchQuery = Branch::owned($ownerRef)->where('organization_id', $organization->id)->where('is_active', true);

        $branchScope = app(OrganizationResolver::class)->branchScope($this->member($request));
        if ($branchScope !== null) {
            $branchQuery->where('id', $branchScope);
        }

        $branches = $branchQuery->orderBy('name')->get();
        $defaultBranch = $branchScope ?? $branches->first()?->id;

        $patients = Patient::owned($ownerRef)
            ->where('organization_id', $organization->id)
            ->when($branchScope, fn ($q) => $q->where('branch_id', $branchScope))
            ->orderBy('first_name')
            ->limit(200)
            ->get();

        $departments = Department::owned($ownerRef)
            ->with('branch')
            ->whereIn('branch_id', $branches->pluck('id'))
            ->where('is_active', true)
            ->get()
            ->sortBy(fn (Department $d) => strtolower(($d->branch?->name ?? '').' '.$d->name))
            ->values();

        return [
            'organization' => $organization,
            'branches' => $branches,
            'defaultBranch' => $defaultBranch,
            'patients' => $patients,
            'practitioners' => $this->activePractitioners($request, $organization->id),
            'departments' => $departments,
        ];
    }

    /**
     * @return Collection<int, Practitioner>
     */
    protected function activePractitioners(Request $request, int $organizationId)
    {
        return Practitioner::owned($this->ownerRef($request))
            ->with(['branch', 'branches'])
            ->where('organization_id', $organizationId)
            ->where('is_active', true)
            ->orderBy('name')
            ->get();
    }

    /**
     * @return array<string, mixed>
     */
    protected function validatedAppointmentData(Request $request): array
    {
        return $request->validate([
            'branch_id' => ['required', 'integer', 'exists:care_branches,id'],
            'patient_id' => ['required', 'integer', 'exists:care_patients,id'],
            'practitioner_id' => ['nullable', 'integer', 'exists:care_practitioners,id'],
            'department_id' => ['nullable', 'integer', 'exists:care_departments,id'],
            'scheduled_at' => ['required', 'date', 'after:now'],
            'reason' => ['nullable', 'string', 'max:1000'],
            'notes' => ['nullable', 'string', 'max:5000'],
        ]);
    }

    /**
     * @return array<string, mixed>
     */
    protected function validatedWalkInData(Request $request): array
    {
        $queueOn = (bool) data_get($this->organization($request)->settings, 'queue_integration_enabled');

        return $request->validate([
            'branch_id' => ['required', 'integer', 'exists:care_branches,id'],
            'patient_id' => ['required', 'integer', 'exists:care_patients,id'],
            'practitioner_id' => [$queueOn ? 'required' : 'nullable', 'integer', 'exists:care_practitioners,id'],
            'department_id' => ['nullable', 'integer', 'exists:care_departments,id'],
            'reason' => ['nullable', 'string', 'max:1000'],
            'notes' => ['nullable', 'string', 'max:5000'],
        ]);
    }
}