<?php

namespace Modules\Patients\Http\Controllers;

use Barryvdh\Snappy\Facades\SnappyPdf;
use Carbon\Carbon;
use Illuminate\Database\QueryException;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Auth;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Redirect;
use Streamline\Models\Drug;
use Streamline\Models\EyeGlasses;
use Streamline\Models\HospitalInformation;
use Streamline\Models\OrderedEyeGlasses;
use Streamline\Models\OrderedService;
use Streamline\Models\OrderedSundry;
use Streamline\Models\Patient;
use Streamline\Models\PatientEpisode;
use Streamline\Models\PointOfSaleRecord;
use Streamline\Models\ReferralHospital;
use Streamline\Models\Sundry;
use Streamline\Models\Services;
use Streamline\Models\Treatment;
use Streamline\Services\ItemsStockService;

class PointOfSaleController extends Controller {

    public function __construct(protected ItemsStockService $itemStockService)
    {
    }

    public function index(Request $request){
        $search_text = "";

        switch ($request->search_date_by){
            case 'yesterday':
                $end_date = Carbon::yesterday()->endOfDay();
                $start_date = Carbon::yesterday()->startOfDay();
                $search_text .= "Yesterday ";
                break;
            case 'custom_date':
                $end_date = Carbon::parse($request->start_date)->endOfDay();
                $start_date = Carbon::parse($request->start_date)->startOfDay();
                $search_text .= "From: " . streamline_date($start_date) . " ";
                break;
            case 'custom_date_range':
                $end_date = Carbon::parse($request->end_date)->endOfDay();
                $start_date = Carbon::parse($request->start_date)->startOfDay();
                $search_text .= "From: " . streamline_date($start_date) . " to " . streamline_date($end_date) . " ";
                break;
            case 'today':
            default:
                $end_date = Carbon::today()->endOfDay();
                $start_date = Carbon::today()->startOfDay();
                $search_text .= "Today ";
                break;
        }

        $records = PointOfSaleRecord::join('patients', 'point_of_sale_records.patient_id', '=', 'patients.id')
            ->whereBetween('point_of_sale_records.created_at', [$start_date, $end_date])
            ->limit(500)->get(['point_of_sale_records.*', 'patients.first_name', 'patients.last_name', 'patients.number']);

        return view('patients::point_of_sale.index', compact('records', 'search_text'));
    }

    public function order_items(){
        $drugs = Drug::get();
        $sundries = Sundry::where('available', 1)->get();
        $services = Services::where('available', 1)->get();
        $eye_glasses = EyeGlasses::get();
        $referral_hospitals = ReferralHospital::orderBy('name')->get();

        return view('patients::point_of_sale.order_items', compact('drugs', 'eye_glasses', 'sundries', 'referral_hospitals', 'services'));
    }

    public function confirm_items(Request $request)
    {
        $pre_ordered_eye_glasses = [];
        $manual_patient_prescriptions = [];
        $automatic_patient_prescriptions = [];
        $pre_ordered_sundries = [];
        $pre_ordered_services = [];

        if($request->patient_id) {
            $patient_id = $request->patient_id;
            $patient = Patient::find($patient_id);

            // double check if for existing patient_id
            if($patient){
                $patient_number = Patient::where('id', $patient_id)->pluck('number')->first();
                $episode_id = PatientEpisode::where('patient_id',$patient_id)->whereDate('created_at', Carbon::today()->toDateString())->pluck('id')->first();
                if(!$episode_id){
                    $episode = new PatientEpisode;
                    $episode->patient_id = $patient_id;
                    $episode->paid_over = "pos";
                    $episode->created_by = Auth::id();
                    $episode->updated_by = Auth::id();
                    $episode->save();
                    flash('A new episode for patient with patient number ' . $patient_number . ' has been initiated.');

                    $episode_id = $episode->id;
                }

            } else {
                flash('Patient not found')->error();
                redirect('point_of_sale');
            }
        } else {
            $patient = new Patient;
            $patient->first_name = $request->first_name;
            $patient->last_name = $request->last_name;
            $patient->phone = $request->phone_number ?? "";
            $patient->referred_from = $request->referral_hospital ?? 1;
            $patient->category_id = 1;
            $patient->created_by = Auth::id();
            $patient->gender = $request->gender ?? 2;

            if (is_null($request->date_of_birth)) {
                $age_in_years = $request->age_in_years ?? 18;
                $calculated_dob = \Carbon\Carbon::now()->subYears($age_in_years);
                $calculated_date_of_birth = $calculated_dob->toDateString();
                $patient->date_of_birth = $calculated_date_of_birth;
            } else {
                $patient->date_of_birth = Carbon::createFromFormat('d/m/Y', $request->date_of_birth)->toDateString();
            }

            if ($patient->save()):
                $prefix = DB::table('hospital_information')->where('id', 1)->value('patient_number_abbr');
                $patient_id = $patient->id;
                $new_id = quadLimit($patient_id);
                $patient_number = $prefix . "-" . $new_id;
                DB::table('patients')->where('id', $new_id)->update(['number' => $patient_number]); // Updating the patient number
            else:
                flash("There was an error")->error();
                return back()->withInput();
            endif;

            $episode = new PatientEpisode;
            $episode->patient_id = $patient_id;
            $episode->clinic_id = get_default_hospital_clinic();
            $episode->paid_over = "pos";
            $episode->created_by = Auth::id();
            $episode->updated_by = Auth::id();

            try {
                $episode->save();
                $episode_id = $episode->id;
                flash('Patient with patient number ' . $patient_number . ' has been successfully registered.')->success();
            } catch (QueryException $e) {
                flash("This episode already exists!")->error();
                return back()->withInput();
            }
        }

        if ($request->selected_eye_glasses) {
            $pre_ordered_eye_glasses = EyeGlasses::whereIn('id', $request->selected_eye_glasses)->get();
            if (stock_levels_to_consider() == 0) {//getting total stock for optical from both stores and pharmacy
                foreach($pre_ordered_eye_glasses as $eye) {$eye->total_stock = $this->itemStockService->getItemAllQuantityByTotal($eye->id, 7);}
            } else{//getting total stock for opticals from pharmacy
                foreach($pre_ordered_eye_glasses as $eye) {$eye->total_stock = $this->itemStockService->getItemQuantity('pharmacy_stock',$eye->id, 7);}
            } 

        }
        if ($request->selected_drugs) {
            if($request->manual_drug_select == 1){
                $manual_patient_prescriptions = Drug::whereIn('id', $request->selected_drugs)->get();
                if (stock_levels_to_consider() == 0) {//getting total stock for drugs from both stores and pharmacy
                    foreach($manual_patient_prescriptions as $drug) {$drug->total_stock = $this->itemStockService->getItemAllQuantityByTotal($drug->id, 1);}
                } else {//getting total stock for drugs from pharmacy
                    foreach($manual_patient_prescriptions as $drug) {$drug->total_stock = $this->itemStockService->getItemQuantity('pharmacy_stock',$drug->id, 1);}
                }

            }else if($request->automatic_drug_select == 1){
                $automatic_patient_prescriptions = Drug::whereIn('id', $request->selected_drugs)->get();
                if (stock_levels_to_consider() == 0) {//getting total stock for drugs from both stores and pharmacy
                    foreach($automatic_patient_prescriptions as $drug) {$drug->total_stock = $this->itemStockService->getItemAllQuantityByTotal($drug->id, 1);}
                } else{//getting total stock for optical from pharmacy
                    foreach($automatic_patient_prescriptions as $drug) {$drug->total_stock = $this->itemStockService->getItemQuantity('pharmacy_stock',$drug->id, 1);}
                } 
            }
        }
        if ($request->selected_sundries) {
            $pre_ordered_sundries = Sundry::whereIn('id', $request->selected_sundries)->get();
            if (stock_levels_to_consider() == 0) {//getting total stock for sundry from both stores and pharmacy
                foreach($pre_ordered_sundries as $sundry) {$sundry->total_stock = $this->itemStockService->getItemAllQuantityByTotal($sundry->id, 2);}
            } else{//getting total stock for optical from  pharmacy
                foreach($pre_ordered_sundries as $sundry) {$sundry->total_stock = $this->itemStockService->getItemQuantity('pharmacy_stock',$sundry->id, 2);}
            } 

        }

        if ($request->selected_services) {
            $pre_ordered_services = Services::whereIn('id', $request->selected_services)->get();
        }

        $allergies = DB::table('allergies')->where(['patient_id' => $patient_id])->pluck('patient_id', 'names');

        return view('patients::point_of_sale.confirm_items', compact('patient_id', 'episode_id', 'pre_ordered_eye_glasses',
            'manual_patient_prescriptions', 'automatic_patient_prescriptions', 'allergies', 'patient', 'pre_ordered_sundries', 'pre_ordered_services'));
    }

    public function confirm_pricing(Request $request){
        $order_sundries_id = NULL;
        $treatment_id = NULL;
        $order_optical_id = NULL;
        $order_service_id = NULL;

        if($request->treatment_item){
            $treatment = new Treatment;
            $treatment->patient_id = $request->patient_id;
            $treatment->episode_id = $request->episode_id;
            $treatment->drugs = implode(',', $request->treatment_item);

            $drugs_array = $request->treatment_item;
            $duration_array = $request->duration;
            $time_array = $request->time;
            $time_duration = [];
            $doses = $request->dose ?? [];
            $frequencies = $request->frequency ?? [];
            $dose_array = [];
            $frequencies_array = [];
            $instructions_array = [];

            for ($i = 0; $i < count($drugs_array); $i++) {
                if (is_drug_chronic($drugs_array[$i])) {
                    register_chronic_patient($request->patient_id, $request->episode_id, $drugs_array[$i]);
                }

                if (isset($duration_array[$i]) && isset($time_array[$i])) {
                    $time_duration[] = $duration_array[$i] . " " . $time_array[$i];
                } else {
                    $time_duration[] = "1 Days";
                }

                if (isset($doses[$i])) {
                    $dose_array[] = $doses[$i];
                } else {
                    $dose_array[] = "1";
                }

                if (isset($frequencies[$i])) {
                    $frequencies_array[] = $frequencies[$i];
                } else {
                    $frequencies_array[] = "2";
                }

                $instructions_array[] = "";
            }

            $treatment->doses = implode(',', $dose_array);
            $treatment->frequencies = implode(',', $frequencies_array);
            $treatment->instruction = implode(',', $instructions_array);
            $treatment->durations = implode(',', $time_duration);
            $treatment->quantities_dispensed = implode(',', $request->treatment_quantity);
            $treatment->dispense_status = 0;
            $treatment->is_pos = 1;
            $treatment->created_by = Auth::id();
            $treatment->save();

            $treatment_id = $treatment->id;
        }

        if($request->eye_glass_item){
            $new_ordered_eye_glasses = new OrderedEyeGlasses;
            $new_ordered_eye_glasses->patient_id = $request->patient_id;
            $new_ordered_eye_glasses->episode_id = $request->episode_id;
            $new_ordered_eye_glasses->eye_glasses_id = implode(",", $request->eye_glass_item);
            $new_ordered_eye_glasses->quantity = implode(",", $request->eye_glass_quantity);
            $new_ordered_eye_glasses->payment_status = 0; //0 by default to mean not paid
            $new_ordered_eye_glasses->created_by = auth()->id();
            $new_ordered_eye_glasses->is_pos = 1;
            $new_ordered_eye_glasses->save();

            $order_optical_id = $new_ordered_eye_glasses->id;
        }

        if($request->pos_sundry_ids){
            $new_ordered_sundries = new OrderedSundry;
            $new_ordered_sundries->patient_id = $request->patient_id;
            $new_ordered_sundries->episode_id = $request->episode_id;
            $new_ordered_sundries->sundries_id = implode(",", $request->pos_sundry_ids);
            $new_ordered_sundries->quantity = implode(",", $request->sundry_quantity);
            $new_ordered_sundries->created_by = auth()->id();
            $new_ordered_sundries->is_pos = 1;
            $new_ordered_sundries->save();

            $order_sundries_id = $new_ordered_sundries->id;
        }

        if ($request->service_id && $request->service_id[0] != null) {
            $new_ordered_service = new OrderedService;
            $new_ordered_service->patient_id = $request->patient_id;
            $new_ordered_service->episode_id = $request->episode_id;
            $new_ordered_service->service_id = implode(",", $request->service_id);
            $new_ordered_service->quantity = implode(",", $request->quantity);
            $new_ordered_service->performed = 0;
            $new_ordered_service->performed_id = 0;
            $new_ordered_service->created_by = auth()->id();
            $new_ordered_service->is_pos = 1;
            $new_ordered_service->save();

            $order_service_id = $new_ordered_service->id;
        }

        $treatment_item = $treatment_quantity = $treatment_subtotal = [];
        // save for treatment
        if($request->treatment_item){
            $treatment_item = $request->treatment_item;
            $treatment_quantity = $request->treatment_quantity;
            $treatment_subtotal = $request->treatment_subtotal;
        }

        $eye_glasses_prices_array = $eye_glasses_quantity_array = $eye_glasses_ids_array = [];
        // save for eye_glasses arrays
        if($request->eye_glass_item){
            $eye_glasses_prices_array = $request->eye_glass_subtotal;
            $eye_glasses_quantity_array = $request->eye_glass_quantity;
            $eye_glasses_ids_array = $request->eye_glass_item;
        }

        $sundry_item = $sundry_quantity = $sundry_subtotal = [];
        // save for sundries array
        if($request->pos_sundry_ids){
            $sundry_item = $request->pos_sundry_ids;
            $sundry_quantity = $request->sundry_quantity;
            $sundry_subtotal = $request->sundry_subtotal;
        }

        // save for service arrays
        $service_ids_array = [];
        $service_prices_array = [];
        $service_quantity_array = [];

        if($request->service_id){
            $service_prices_array = $request->service_item_subtotal;
            $service_ids_array = $request->service_id;
            $service_quantity_array = $request->quantity;
        }

        $pos_record = new PointOfSaleRecord();
        $pos_record->patient_id = $request->patient_id;
        $pos_record->episode_id = $request->episode_id;
        $pos_record->treatments = count($treatment_item) > 0 ? json_encode([
            "ids" => $treatment_item, "quantity" => $treatment_quantity,
            "subtotal" => $treatment_subtotal, "order_id" => $treatment_id
        ]) : NULL;
        $pos_record->eye_glasses = count($eye_glasses_ids_array) > 0 ? json_encode([
            "ids" => $eye_glasses_ids_array, "quantity" => $eye_glasses_quantity_array,
            "subtotal" => $eye_glasses_prices_array, "order_id" => $order_optical_id
        ]) : NULL;
        $pos_record->sundries = count($sundry_item) > 0 ? json_encode([
            "ids" => $sundry_item, "quantity" => $sundry_quantity,
            "subtotal" => $sundry_subtotal, "order_id" => $order_sundries_id
        ]) : NULL;
        $pos_record->services = count($service_ids_array) > 0 ? json_encode([
            "ids" => $service_ids_array, "quantity" => $service_quantity_array,
            "subtotal" => $service_prices_array, "order_id" => $order_service_id
        ]) : NULL;
        $pos_record->created_by = Auth::id();
        $pos_record->save();

        return redirect('point_of_sale/print/' . $pos_record->id);
    }

    public function add_referral(Request $request) {
        $logged_in_user_id = Auth::id();
        $referral_hospital = new ReferralHospital;
        $referral_hospital->name = $request->name;
        $referral_hospital->created_by = $logged_in_user_id;
        $referral_hospital->updated_by = $logged_in_user_id;

        if ($referral_hospital->save()) {
            //insert successful
            return $referral_hospital->id;
        } else {
            return 0;
        }
    }

    public function get_patient(Request $request){
        $patient = Patient::where('id', $request->patient_id)->first();
        return $patient;
    }

    public function print($id) {
        $record = PointOfSaleRecord::find($id);

        if ($record) {
            if (is_cashier_receipt_type_print_html()) {
                $hospital_information = HospitalInformation::first();
                $patient = Patient::find($record->patient_id);
                $receipt_date = $record->created_at;
                $receipt_reprint_date = date('Y-m-d h:i:s');
                $first_printed_by = $record->created_by;

                $treatments_array = json_decode($record->treatments, true);
                $sundries_array = json_decode($record->sundries, true);
                $eye_glasses_array = json_decode($record->eye_glasses, true);
                $services_array = json_decode($record->services, true);

                $treatment_item = $treatments_array ? $treatments_array["ids"] : [];
                $treatment_quantity = $treatments_array ? $treatments_array["quantity"] : [];
                $treatment_subtotal = $treatments_array ? $treatments_array["subtotal"] : [];
                $treatment_number = $treatments_array ? ($treatments_array["order_id"] ?? 0) : [];
                $eye_glasses_ids_array = $eye_glasses_array ? $eye_glasses_array["ids"] : [];
                $eye_glasses_quantity_array = $eye_glasses_array ? $eye_glasses_array["quantity"] : [];
                $eye_glasses_prices_array = $eye_glasses_array ? $eye_glasses_array["subtotal"] : [];
                $eye_glasses_number = $eye_glasses_array ? ($eye_glasses_array["order_id"] ?? 0) : [];
                $sundry_item = $sundries_array ? $sundries_array["ids"] : [];
                $sundry_quantity = $sundries_array ? $sundries_array["quantity"] : [];
                $sundry_subtotal = $sundries_array ? $sundries_array["subtotal"] : [];
                $sundry_number = $sundries_array ? ($sundries_array["order_id"] ?? 0) : [];
                $service_ids_array = $services_array ? $services_array["ids"] : [];
                $service_quantity_array = $services_array ? $services_array["quantity"] : [];
                $service_prices_array = $services_array ? $services_array["subtotal"] : [];
                $service_number = $services_array ? ($services_array["order_id"] ?? 0) : [];

                return view('patients::point_of_sale.receipt', compact('treatment_item', 'treatment_quantity', 'treatment_subtotal',
                    'eye_glasses_prices_array', 'eye_glasses_quantity_array', 'eye_glasses_ids_array', 'hospital_information', 'patient', 'receipt_date', 'first_printed_by',
                    'sundry_item','sundry_quantity','sundry_subtotal', 'service_ids_array', 'service_prices_array', 'service_quantity_array', 'receipt_reprint_date',
                    'eye_glasses_number', 'treatment_number', 'sundry_number', 'service_number'));
            } else {
                // set up the redirect link for html
                session()->put('print_pos_pdf', 1);
                session()->put('print_pos_pdf_id', $id);

                return redirect('/point_of_sale');
            }
        } else {
            return redirect('/point_of_sale');
        }
    }

    public function print_pos_pdf() {
        $id = session()->get("print_pos_pdf_id");

        // add check for when the people try to reload the page
        if (!$id) {
            return redirect('/point_of_sale');
        }

        // lest i forget Thy love for me
        session()->forget('print_pos_pdf');
        session()->forget('print_pos_pdf_id');

        $record = PointOfSaleRecord::find($id);

        if ($record) {
            $hospital_information = HospitalInformation::first();
            $patient = Patient::find($record->patient_id);
            $receipt_date = $record->created_at;
            $receipt_reprint_date = date('Y-m-d h:i:s');

            $treatments_array = json_decode($record->treatments, true);
            $sundries_array = json_decode($record->sundries, true);
            $eye_glasses_array = json_decode($record->eye_glasses, true);
            $services_array = json_decode($record->services, true);

            $treatment_item = $treatments_array ? $treatments_array["ids"] : [];
            $treatment_quantity = $treatments_array ? $treatments_array["quantity"] : [];
            $treatment_subtotal = $treatments_array ? $treatments_array["subtotal"] : [];
            $treatment_number = $treatments_array ? ($treatments_array["order_id"] ?? 0) : [];
            $eye_glasses_ids_array = $eye_glasses_array ? $eye_glasses_array["ids"] : [];
            $eye_glasses_quantity_array = $eye_glasses_array ? $eye_glasses_array["quantity"] : [];
            $eye_glasses_prices_array = $eye_glasses_array ? $eye_glasses_array["subtotal"] : [];
            $eye_glasses_number = $eye_glasses_array ? ($eye_glasses_array["order_id"] ?? 0) : [];
            $sundry_item = $sundries_array ? $sundries_array["ids"] : [];
            $sundry_quantity = $sundries_array ? $sundries_array["quantity"] : [];
            $sundry_subtotal = $sundries_array ? $sundries_array["subtotal"] : [];
            $sundry_number = $sundries_array ? ($sundries_array["order_id"] ?? 0) : [];
            $service_ids_array = $services_array ? $services_array["ids"] : [];
            $service_quantity_array = $services_array ? $services_array["quantity"] : [];
            $service_prices_array = $services_array ? $services_array["subtotal"] : [];
            $service_number = $services_array ? ($services_array["order_id"] ?? 0) : [];

            $data = [
                "patient" => $patient, "receipt_date" => $receipt_date, "receipt_reprint_date" => $receipt_reprint_date, "hospital_information" => $hospital_information,
                "treatment_item" => $treatment_item, "treatment_quantity" => $treatment_quantity, "treatment_subtotal" => $treatment_subtotal,
                "eye_glasses_ids_array" => $eye_glasses_ids_array, "eye_glasses_quantity_array" => $eye_glasses_quantity_array, "eye_glasses_prices_array" => $eye_glasses_prices_array,
                "sundry_item" => $sundry_item, "sundry_quantity" => $sundry_quantity, "sundry_subtotal" => $sundry_subtotal,
                "service_ids_array" => $service_ids_array, "service_quantity_array" => $service_quantity_array, "service_prices_array" => $service_prices_array,
                "treatment_number" => $treatment_number, "eye_glasses_number" => $eye_glasses_number, "sundry_number" => $sundry_number, "service_number" => $service_number,
            ];

            $pdf = SnappyPDF::loadView('patients::point_of_sale.print_pos_pdf', $data)
                ->setOrientation('portrait')
                ->setPaper('a4')
                ->setOption('margin-bottom', 5)
                ->setOption('margin-top', 5)
                ->setOption('footer-html', '<i>&copy; ' . date('Y') . ' Stre@mline</i>');

            return $pdf->inline('Patient Receipt' . date(" d-m-y h:ia") . '.pdf');
        } else {
            return redirect('/point_of_sale');
        }
    }
}