<?php

namespace Modules\Patients\Http\Controllers;

use Carbon\Carbon;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\DB;
use Streamline\Models\Clinic;
use Streamline\Models\PatientEpisode;
use Streamline\Models\InpatientInfo;
use Illuminate\Database\QueryException;
use Streamline\Models\Consultation;

class PatientFlowMonitoringController extends Controller {

    public function __construct() {
        $this->middleware('auth');
        $this->middleware('permission:patient-flow-monitoring');
    }

    public function index(Request $request){
        $clinic_id = $request->clinic_id;
        $search_by = $request->search_by;
        $reg_date = $request->reg_date;
        $start_date = $request->start_date;
        $end_date = $request->end_date;
        $order_by = $request->order_by ?? 1;

        if (!isset($clinic_id) && !isset($search_by)){
            $clinic_id = session()->get('clinic_id');
            $search_by = session()->get('search_by');
            $reg_date = session()->get('reg_date');
            $start_date = session()->get('start_date');
            $end_date = session()->get('end_date');
            $order_by = session()->get('order_by');
        } else {
            session()->put('clinic_id', $clinic_id);
            session()->put('search_by', $search_by);
            session()->put('reg_date', $reg_date);
            session()->put('start_date', $start_date);
            session()->put('end_date', $end_date);
            session()->put('order_by', $order_by);
        }

        if($search_by === 0){
            // last 24 hours
            $start_date_search = Carbon::yesterday()->startOfDay()->toDateTimeString();
            $end_date_search = Carbon::yesterday()->endOfDay()->toDateTimeString();

            $date_search = "Yesterday";
        } elseif($search_by == 1){
            // custom date
            $start_date_search = Carbon::parse($reg_date)->startOfDay()->toDateTimeString();
            $end_date_search = Carbon::parse($reg_date)->endOfDay()->toDateTimeString();

            $date_search = streamline_date($start_date_search);
        } elseif($search_by == 2){
            // custom date range
            $start_date_search = Carbon::parse($start_date)->startOfDay()->toDateTimeString();
            $end_date_search = Carbon::parse($end_date)->endOfDay()->toDateTimeString();

            $date_search = streamline_date($start_date_search) . " to " . streamline_date($end_date_search);
        } else {
            // Today
            $start_date_search = Carbon::today()->startOfDay()->toDateTimeString();
            $end_date_search = Carbon::today()->endOfDay()->toDateTimeString();

            $date_search = "Today";
        }

        switch (get_select_clinic_order_type()) {
            case 0:
                if ($order_by == 0) {
                    $order_by_text = "patient_episodes.id";
                } else {
                    $order_by_text = "triage.severe_grade desc, patient_episodes.id";
                }
                break;
            case 1:
                if ($order_by == 0) {
                    $order_by_text = "patient_episodes.id desc";
                } else {
                    $order_by_text = "triage.severe_grade desc, patient_episodes.id desc";
                }
                break;
            case 2:
            default:
                if ($order_by == 0) {
                    $order_by_text = "consultations.completed, patient_episodes.id";
                } else {
                    $order_by_text = "consultations.completed, triage.severe_grade desc, patient_episodes.id";
                }
                break;
        }

        if($clinic_id == 0){
            $patient_episodes = DB::table('patient_episodes')
                ->whereNull('patient_episodes.deleted_at')
                ->leftJoin('consultations', 'patient_episodes.id', '=', 'consultations.episode_id')
                ->leftJoin('ante_natal_clinic_followups as a', 'patient_episodes.id', '=', 'a.episode_id')
                ->leftJoin('triage', 'patient_episodes.id', '=', 'triage.episode_id')
                ->select('patient_episodes.*', 'consultations.primary_diagnosis','consultations.outcome_id','consultations.completed','consultations.created_by as consultation_created_by','consultations.updated_by as consultation_updated_by','consultations.consultation_done_by', 'a.primary_diagnosis as antenatal_primary_diagnosis','a.outcome_id as antenatal_outcome_id','a.completion_status as antenatal_completed','a.created_by as antenatal_created_by','a.updated_by as antenatal_updated_by', 'triage.id as episode_triage_id', 'triage.severe_grade', 'triage.clinic_allocation')
                ->whereBetween('patient_episodes.created_at', [$start_date_search, $end_date_search])
                ->orderByRaw($order_by_text)
                ->paginate(200);
            $clinic_name = "OPD";
        } else {
            $patient_episodes = DB::table('patient_episodes')
                ->whereNull('patient_episodes.deleted_at')
                ->leftJoin('consultations', 'patient_episodes.id', '=', 'consultations.episode_id')
                ->leftJoin('ante_natal_clinic_followups as a', 'patient_episodes.id', '=', 'a.episode_id')
                ->leftJoin('triage', 'patient_episodes.id', '=', 'triage.episode_id')
                ->where(['patient_episodes.clinic_id' => $clinic_id])
                ->whereBetween('patient_episodes.created_at', [$start_date_search, $end_date_search])
                ->orderByRaw($order_by_text)
                ->select('patient_episodes.*', 'consultations.primary_diagnosis','consultations.outcome_id','consultations.completed','consultations.created_by as consultation_created_by','consultations.updated_by as consultation_updated_by','consultations.consultation_done_by', 'a.primary_diagnosis as antenatal_primary_diagnosis','a.outcome_id as antenatal_outcome_id','a.completion_status as antenatal_completed','a.created_by as antenatal_created_by','a.updated_by as antenatal_updated_by','triage.id as episode_triage_id', 'triage.severe_grade', 'triage.clinic_allocation')
                ->paginate(200);
            $clinic_name = get_name($clinic_id, 'id', 'name', 'clinics');
        }

        $patient_categories = DB::table("patient_categories")->whereNull('deleted_at')->pluck("name", "id");

        $clinics = DB::table("clinics")->whereNull("deleted_at")->orderBy("name")->pluck("name", "id")->toArray();
        $clinics = [0 => 'OPD'] + $clinics;
        $clinics = ['' => '- select -'] + $clinics;

        $diagnoses = DB::table('diagnoses')->where('available', 1)->whereNull('deleted_at')->pluck("name", "id")->toArray();

        $wards = DB::table('wards')->where('available', 1)->whereNull('deleted_at')->pluck("name", "id")->prepend('- select -', '');

        return view('patients::patient_flow_monitoring.index', compact('patient_episodes', 'clinics', 'patient_categories','clinic_name','search_by', 'date_search', 'wards', 'diagnoses'));
    }

    public function patient_route($episode_id, $route){

        $episode = PatientEpisode::find($episode_id);
        $patient_id = $episode->patient_id;

        // set up session
        session()->put(['patient_id' => $patient_id]);
        session()->put(['episode_id' => $episode_id]);

        if($route == 'triage'){
            $url = '/triage';
            session()->put('triage_without_etat', 0);
        } elseif ($route == 'consultation'){
            session()->put('consultation_with_notes', 0);
            $url = '/consultation/route';
        } elseif ($route == 'create_anaesthetics'){
            $url = '/anaesthetics/create';
        } elseif ($route == 'create_surgery'){
            $url = '/theatre_surgery/create';
        } elseif ($route == 'anaesthetics_history'){
            $url = '/anaesthetics/history';
        } elseif ($route == 'surgery_index'){
            $url = '/theatre_surgery';
        } elseif ($route == 'treatment') {
            $url = '/prescriptions/create';
        } elseif ($route == 'anc_registration_button'){
            $url = '/ante_natal_clinic/create';
        } elseif ($route == 'anc_followup_button'){
            $url = '/ante_natal_clinic_follow_up/create';
        } elseif ($route == 'investigation') {
            $url = '/investigations/investigations_review';
        } elseif ($route == 'triage_without_etat') {
            session()->put('triage_without_etat', 1);
            $url = '/triage';
        } elseif ($route == 'consultation_with_notes') {
            session()->put('consultation_with_notes', 1);
            $url = '/consultation/route';
        } elseif ($route == 'view_patient_history') {
            $url = '/patient_episodes/';
        } elseif ($route == 'main_exam') {
            $url = '/eye_clinic/main_exam_route';
        } elseif ($route == 'base_refraction_exam') {
            $url = '/eye_clinic/base_exam_refraction';
        }

        return response()->json($url);
    }

    public function inpatient_admission(Request $request)
    {
        $episode = PatientEpisode::find($request->admission_episode_id);
        $patient_id = $episode->patient_id;
        $ward_id = $request->admission_ward_id;
        $admitted_on = $request->ward_admission_date;

        try {
            $episode_id = $episode->id;
            session()->put(['episode_id' => $episode_id]);
            session()->put(['patient_id' => $patient_id]);

            $consultation = Consultation::where(['patient_id' => $patient_id, 'episode_id' => $episode_id])->first();
            if ($consultation) {
                $consultation->outcome_id = get_name("Admitted", "name", "id", "outcomes");
                $consultation->ward_id = $ward_id;
                $consultation->admitted_on = $admitted_on;
                $consultation->save();
            }

            // Admit patient in ward
            $existing_inpatient = InpatientInfo::where(['episode_id' => $episode_id])->first();
            if ($existing_inpatient) {
                $ward_id = $existing_inpatient->ward_id;
                $ward_name = get_name($ward_id, "id", "name", "wards");

                flash("Patient ".get_name($patient_id, "id", "number", "patients")." already admitted for in admitted in ".$ward_name. ". You can use the ward transfer option incase you want to transfer to another ward")->error();
            } else {
                $inpatient = is_null($existing_inpatient) ? new InpatientInfo : $existing_inpatient;
                $inpatient = new InpatientInfo;
                $inpatient->patient_id = $patient_id;
                $inpatient->episode_id = $episode_id;
                $inpatient->admitted_on = $admitted_on;
                $inpatient->ward_id = $ward_id;
                $inpatient->created_by = auth()->user()->id;
                $inpatient->created_at = Carbon::now();
                $inpatient->save();

                $ward_name = get_name($ward_id, "id", "name", "wards");

                flash("Patient ".get_name($patient_id, "id", "number", "patients")." admitted in ".$ward_name)->success();
            }
            
            return redirect('/patient_episodes/');
        } catch (QueryException $e) {
            flash("This episode already exists!")->error();
            return back()->withInput();
        }
    }
}