<?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;
use Illuminate\Validation\Rule;
use Illuminate\Routing\ResponseFactory;
use Illuminate\Support\MessageBag;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Validator;
use Carbon\Carbon;
use Illuminate\Database\Eloquent\Model;
use App\Booking;
use App\Invoice;
use App\InvoiceDetails;
use App\InvoiceStatuses;
use App\SupplierBooking;
use App\SettingSupplier;
use App\Marking;
use App\User;
use PDF;

class InvoiceController extends Controller
{
    public function show($id)
    {
        // validate $id is number

        $invoice = Invoice::where('booking_id', $id)->first();
        if (!$invoice) {
            return response()->json(['message' => 'Invoice Not Found'], 404);
        }
        $lines = InvoiceDetails::where('invoice_id', $invoice['id'])->orderBy('order', 'asc')->get();

        $status = InvoiceStatuses::where('invoice_id', $invoice['id'])->orderBy('created_at', 'asc')->get();

        $invoice->lines = $lines;
        $invoice->status = $status;
        return response()->json($invoice, 200);

    }

    public function create(Request $request, $id)
    {
        $user = $request->user();

        // validate $id

        $validatedData = $request->validate([
            'address' => 'required',
            'buyer_company' => 'required',
            'contact_no' => 'required',
            'marking' => 'required',
            'reg_no' => 'required',
            'lines.*.order' => 'required|numeric',
            'lines.*.stock_code' => 'required',
            'lines.*.description' => 'required',
            'lines.*.quantity' => 'required|numeric',
            'lines.*.unit_price_rm' => 'required|numeric',
            'lines.*.unit_price_rmb' => '',
            'lines.*.total' => 'required|numeric',
        ]);
        
        // booking_id belongs to user
        $booking = Booking::where('id', $id)->first();
        if (!$booking) {
            return response()->json(['message' => 'Unable to find booking'], 403);
        }

        // user_id in booking does not match
        if ($booking->user_id !== $user->id) {
            return response()->json([
                'message' => 'Booking does not belongs to you'
            ], 403);
        }

        // Amount match with total
        $subtotalArray = array_map(
            function ($line) { return $line['total']; },
            $validatedData['lines']
        );
        $total = array_reduce($subtotalArray, function ($v1, $v2) {
            return $v1 + $v2;
        });
        if ($total !== $booking->amount) {
            return response()->json([
                'message' => 'Booking amount expected is '.$booking->amount.'. Your Invoice amount is '.$total
            ], 400);
        }

        // Write to database if does not exist
        $exist = Invoice::where('booking_id', $id)->first();
        if ($exist) {
            return response()
                    ->json(['message' => 'Invoice exist. Cannot create duplicate invoice. Try edit.'], 400);
        }

        // Generate PO Number - po20200810-001(PO Format)
        $dt = Carbon::now();
        $po_number = 'po'.$dt->format('Ymmdd').'-'.$id;

        $invoice = new Invoice;
        $invoice->amount = $total;
        $invoice->booking_id = (int)$id;
        $invoice->reg_no = $validatedData['reg_no'];
        $invoice->buyer_company = $validatedData['buyer_company'];
        $invoice->address = $validatedData['address'];
        $invoice->contact_no = $validatedData['contact_no'];
        $invoice->po_number = $po_number;
        $invoice->save();

        if (!$invoice) {
            return response()
                    ->json(['message' => 'Unable to Save Data'], 500);
        }

        // Insert invoice_id into lines
        foreach( $validatedData['lines'] as $key => $line) {
            $invoice_details = new InvoiceDetails;
            $invoice_details->order = $line['order'];
            $invoice_details->description = $line['description'];
            $invoice_details->quantity = $line['quantity'];
            $invoice_details->stock_code = $line['stock_code'];
            $invoice_details->invoice_id = $invoice->id;
            $invoice_details->unit_price_rmb = $line['unit_price_rmb'];
            $invoice_details->unit_price_rm = $line['unit_price_rm'];
            $invoice_details->total = $line['total'];

            $invoice_details->save();
        }
        unset($line);

        $invoice->lines = $invoice_details;

        // Post status as pending
        $status = new InvoiceStatuses;
        $status->status = 'pending';
        $status->comment = '';
        $status->invoice_id = $invoice->id;
        $status->save();

        if($invoice_details) {
            return $this->show($id);
        } else {
            return response(500);
        }
    }

    public function edit(Request $request, $id)
    {
        $user = $request->user();

        // validate $id

        $validatedData = $request->validate([
            'address' => 'required',
            'buyer_company' => 'required',
            'contact_no' => 'required',
            'marking' => 'required',
            'reg_no' => 'required',
            'lines.*.order' => 'required|numeric',
            'lines.*.stock_code' => 'required',
            'lines.*.description' => 'required',
            'lines.*.quantity' => 'required|numeric',
            'lines.*.unit_price_rm' => 'required|numeric',
            'lines.*.unit_price_rmb' => '',
            'lines.*.total' => 'required|numeric',
        ]);
        
        // booking_id belongs to user
        $booking = Booking::where('id', $id)->first();
        if (!$booking) {
            return response()->json(['message' => 'Unable to find booking'], 403);
        }

        $invoice = Invoice::where('booking_id', $id)->first();
        if (!$invoice) {
            return response()->json(['message' => 'Invoice Not Found'], 404);
        }

        // role === 'member' && $booking->user_id !== user()->id &&  $currentstatus !== 'request_change')
        if ($request->user()->role === 'member') {
            if ($booking->user_id !== $request->user()->id) {
                return response()->json([
                    'message' => 'Booking does not belongs to you'
                ], 403);
            }
            
            $currentstatus = InvoiceStatuses::where('invoice_id', $invoice['id'])->latest('created_at')->first()->status;
            if ($currentstatus !== 'request_change') {
                return response()->json(['message' => 'Submitted PO can only be changed when status is request_change'], 403);
            }
        }

        // Amount match with total
        $subtotalArray = array_map(
            function ($line) { return $line['total']; },
            $validatedData['lines']
        );
        $total = array_reduce($subtotalArray, function ($v1, $v2) {
            return $v1 + $v2;
        });
        if ($total != $booking->amount) {
            return response()->json([
                'message' => 'Booking amount expected is '.$booking->amount.'. Your Invoice amount is '.$total
            ], 400);
        }

        // Generate PO Number - po20200810-001(PO Format)
        $dt = Carbon::now();
        $po_number = 'po'.$dt->format('Ymmdd').'-'.$id;

        $invoice->amount = $total;
        $invoice->booking_id = (int)$id;
        $invoice->reg_no = $validatedData['reg_no'];
        $invoice->buyer_company = $validatedData['buyer_company'];
        $invoice->address = $validatedData['address'];
        $invoice->contact_no = $validatedData['contact_no'];
        $invoice->po_number = $po_number;
        $invoice->save();

        if (!$invoice) {
            return response()
                    ->json(['message' => 'Unable to Save Data'], 500);
        }

        // Remove all invoice_details corresponding to invoice_id
        $invoice_details = InvoiceDetails::where('invoice_id', $invoice->id);
        $invoice_details->delete();

        // Insert invoice_id into lines
        foreach( $validatedData['lines'] as $key => $line) {
            $invoice_details = new InvoiceDetails;
            $invoice_details->order = $line['order'];
            $invoice_details->description = $line['description'];
            $invoice_details->quantity = $line['quantity'];
            $invoice_details->stock_code = $line['stock_code'];
            $invoice_details->invoice_id = $invoice->id;
            $invoice_details->unit_price_rmb = $line['unit_price_rmb'];
            $invoice_details->unit_price_rm = $line['unit_price_rm'];
            $invoice_details->total = $line['total'];

            $invoice_details->save();
        }
        unset($line);

        // Post status as pending
        $status = new InvoiceStatuses;
        $status->status = 'pending';
        if ($request->user()->role === 'admin') {
            $status->comment = 'Edited by Admin.';
        } else {
            $status->comment = 'Edited by Member.';
        }
        $status->invoice_id = $invoice->id;
        $status->save();

        if($invoice_details) {
            return $this->show($id);
        } else {
            return response(500);
        }
    }

    public function postStatus(Request $request, $id)
    {

        // validate $id is integer

        $validatedData = $request->validate([
            'status' => ['required', Rule::in('request_change', 'approve')],
            'comment' => Rule::requiredIf($request->status === 'request_change')
        ]);

        // Save status to database

        $status = new InvoiceStatuses;
        $status->status = $validatedData['status'];
        $status->comment = $validatedData['comment'];
        $status->invoice_id = Invoice::where('booking_id', $id)->first()['id'];
        $status->save();

        if(!$status) {
            return response()->json(['message' => 'Unable to Update Status'], 500);
        }

        // Change Status to 7 if approve
        // Add email event here
        if ($validatedData['status'] === 'approve') {
            $booking = Booking::find($id);
            $booking->status = 7;
            $booking->admin_status = 7;
            $booking->save();

            if(!$booking) {
                return response()->json(['message' => 'Unable to Complete Booking. Please Approve Again'], 500);
            }
        }

        // Response
        return response()->json($status, 201);


    }

    public function customerToCIEFPO(Request $request, $id)
    {
        // Booking Exist and Belongs to User or is Admin
        if ($request->user()->role === 'member') {
            if (!$this->isUser($id, $request->user()->id)) {
                return response()->json(['message' => 'The PO Does not belongs to you.'], 403);
            }
        }

        // Ensure Invoice Status is Approve
        // if ($this->invoiceStatus($id) !== 'approve') {
        //     return response()->json(['message' => 'Invoice must and exist and approve status.'], 403);
        // }

        // Generate PO

        $booking = Booking::where('id', $id)->first();
        $invoice = Invoice::where('booking_id', $booking['id'])->first();
        $lines = InvoiceDetails::where('invoice_id', $invoice->id)->get();
        $marking = User::find($booking->user_id)->marking;

        $data = [
            'title' => 'Purchase Order',
            'detail' => [
                'date' => Carbon::createFromFormat('Y-m-d H:i:s', $booking->created_at)->format('d-m-Y'),
                'po' => $invoice->po_number,
                'do' => '',
                'ref' => $booking->id
            ],
            'buyer' => [
                'buyer_company' => $invoice->buyer_company,
                'reg_no' => $invoice->reg_no,
                'address' => $invoice->address,
                'gst' => '',
                'phone' => $invoice->contact_no,
                'marking_no' => $marking
            ],
            'seller' => [
                'seller_company' => 'CIEF Worldwide Sdn Bhd (1134596-M)',
                'address' => 'Malaysia Global Innovation & Creativity Centre, Level
                1 CWS, Block 3730, Persiaran APEC 63000
                Cyberjaya.',
                'phone' => '018 2909252',
            ],
            'lines' => $lines,
            'amount' => $invoice->amount
        ];
        $pdf = PDF::loadView('pdf/po', $data);


        // Send
        return $pdf->download('po.pdf');

    }

    public function CIEFToSupplierDO(Request $request, $id)
    {
        // Booking Exist and Belongs to User or is Admin
        if ($request->user()->role === 'member') {
            if (!$this->isUser($id, $request->user()->id)) {
                return response()->json(['message' => 'The PO Does not belongs to you.'], 403);
            }
        }

        // Ensure Invoice Status is Approve
        // if ($this->invoiceStatus($id) !== 'approve') {
        //     return response()->json(['message' => 'Invoice must and exist and approve status.'], 403);
        // }

        // Generate PO

        $booking = Booking::where('id', $id)->first();
        $invoice = Invoice::where('booking_id', $booking['id'])->first();
        $lines = InvoiceDetails::where('invoice_id', $invoice->id)->get();
        $supplierbooking = SupplierBooking::where('booking_id', $id)->first();
        $supplier = SettingSupplier::where('id', $supplierbooking->supplier_id)->first();

        $data = [
            'title' => 'Delivery Order',
            'detail' => [
                'date' => Carbon::createFromFormat('Y-m-d H:i:s', $booking->created_at)->format('d-m-Y'),
                'po' => $invoice->po_number,
                'do' => '',
                'ref' => $booking->id
            ],
            'buyer' => [
                'buyer_company' => 'CIEF Worldwide Sdn Bhd (1134596-M)',
                'reg_no' => '',
                'address' => 'Malaysia Global Innovation & Creativity Centre, Level
                                1 CWS, Block 3730, Persiaran APEC 63000
                                Cyberjaya.',
                'gst' => '',
                'phone' => '018 2909252',
                'marking_no' => ''
            ],
            'seller' => [
                'seller_company' => $supplier->company_name,
                'address' => '',
                'phone' => '',
            ],
            'lines' => $lines,
            'amount' => $invoice->amount
        ];
        $pdf = PDF::loadView('pdf/po', $data);


        // Send
        return $pdf->download('do.pdf');

    }

    public function CIEFToCustomerInvoice($id)
    {
        $booking = Booking::where('id', $id)->first();
        $invoice = Invoice::where('booking_id', $booking['id'])->first();
        $lines = InvoiceDetails::where('invoice_id', $invoice->id)->get();

        $data = [
            'title' => 'INVOICE',
            'detail' => [
                'date' => Carbon::createFromFormat('Y-m-d H:i:s', $booking->created_at)->format('d-m-Y'),
                'ei' => 'EI-202009-000001',
                'edo' => '',
                'ref' => $booking->id
            ],
            'billto' => [
                'buyer_company' => $invoice->buyer_company,
                'reg_no' => $invoice->reg_no,
                'address' => $invoice->address,
                'gst' => '',
                'phone' => $invoice->contact_no,
                'marking_no' => ''
            ],
            'lines' => $lines,
            'amount' => $invoice->amount
        ];

        $pdf = PDF::loadView('pdf/invoice', $data);
 
         // Send
        return $pdf->download('invoice.pdf');
    }

    public function CIEFToCustomerDO($id)
    {
         // Generate PO

        $booking = Booking::where('id', $id)->first();
        $invoice = Invoice::where('booking_id', $booking['id'])->first();
        $lines = InvoiceDetails::where('invoice_id', $invoice->id)->get();

        $data = [
            'title' => 'DO',
            'detail' => [
                'date' => Carbon::createFromFormat('Y-m-d H:i:s', $booking->created_at)->format('d-m-Y'),
                'ei' => '',
                'edo' => 'EDO-202009-000001',
                'ref' => $booking->id
            ],
            'billto' => [
                'buyer_company' => $invoice->buyer_company,
                'reg_no' => $invoice->reg_no,
                'address' => $invoice->address,
                'gst' => '',
                'phone' => $invoice->contact_no,
                'marking_no' => ''
            ],
            'lines' => $lines,
            'amount' => $invoice->amount
        ];

        $pdf = PDF::loadView('pdf/invoice', $data);
 
         // Send
        return $pdf->download('do.pdf');
    }

    private function isUser($booking_id, $user_id) {
        
        $booking = Booking::where([
            ['id', '=', $booking_id],
            ['user_id', '=', $user_id]
        ])->first();
        
        if ($booking) {
            return true;
        } else {
            return false;
        }
    }

    private function invoiceStatus($booking_id) {
        $invoice = Invoice::where('booking_id', $booking_id)->first();
        if (!$invoice) {
            return;
        }
        $currentstatus = InvoiceStatuses::where('invoice_id', $invoice['id'])->latest('created_at')->first()->status;
        return $currentstatus;
    }
}