<?php

namespace App\Http\Controllers;

use App\Models\Billing;
use App\Models\TrRegistrasi;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Validator;

class BillingController extends Controller
{
    /**
     * Display a listing of the resource.
     */
    public function index()
    {
        $billings = Billing::with('registrasi')->orderBy('TanggalBilling', 'desc')->paginate(10);
        return view('admin.billing.index', compact('billings'));
    }

    /**
     * Show the form for creating a new resource.
     */
    public function create()
    {
        $registrasis = TrRegistrasi::whereDoesntHave('billing')->get();
        return view('admin.billing.Input-form', compact('registrasis'));
    }

    /**
     * Store a newly created resource in storage.
     */
    public function store(Request $request)
    {
        $validator = Validator::make($request->all(), [
            'IdRegistrasi' => 'required|exists:tr_registrasi,IdRegistrasi',
            'TanggalBilling' => 'required|date',
            'Dibayar' => 'required|numeric|min:0',
            'Keterangan' => 'nullable|string|max:255'
        ]);

        if ($validator->fails()) {
            return redirect()->back()
                ->withErrors($validator)
                ->withInput();
        }

        DB::beginTransaction();
        try {
            $billing = new Billing();
            $billing->IdRegistrasi = $request->IdRegistrasi;
            $billing->TanggalBilling = $request->TanggalBilling;
            $billing->Dibayar = $request->Dibayar;
            $billing->Keterangan = $request->Keterangan;

            // Menghitung total biaya secara otomatis berdasarkan transaksi
            $billing->TotalBiaya = 0; // Nilai awal
            $billing->save();

            // Menggunakan method dari model untuk menghitung total biaya
            $billing->TotalBiaya = $billing->calculateTotalBiaya();

            // Update sisa dan status pembayaran
            $billing->updateSisa();

            DB::commit();
            return redirect()->route('billing.show', $billing->IdBilling)
                ->with('success', 'Billing berhasil dibuat.');
        } catch (\Exception $e) {
            DB::rollBack();
            return redirect()->back()
                ->with('error', 'Terjadi kesalahan: ' . $e->getMessage())
                ->withInput();
        }
    }

    /**
     * Display the specified resource.
     */
    public function show(string $id)
    {
        $billing = Billing::with('registrasi')->findOrFail($id);
        $transaksis = $billing->getTransaksiDetails();

        return view('admin.billing.show-form', compact('billing', 'transaksis'));
    }

    /**
     * Show the form for editing the specified resource.
     */
    public function edit(string $id)
    {
        $billing = Billing::findOrFail($id);
        return view('billing.edit', compact('billing'));
    }

    /**
     * Update the specified resource in storage.
     */
    public function update(Request $request, string $id)
    {
        $validator = Validator::make($request->all(), [
            'TanggalBilling' => 'required|date',
            'Dibayar' => 'required|numeric|min:0',
            'Keterangan' => 'nullable|string|max:255'
        ]);

        if ($validator->fails()) {
            return redirect()->back()
                ->withErrors($validator)
                ->withInput();
        }

        DB::beginTransaction();
        try {
            $billing = Billing::findOrFail($id);
            $billing->TanggalBilling = $request->TanggalBilling;
            $billing->Dibayar = $request->Dibayar;
            $billing->Keterangan = $request->Keterangan;

            // Recalculate total biaya (jika ada perubahan transaksi)
            $billing->TotalBiaya = $billing->calculateTotalBiaya();

            // Update sisa dan status pembayaran
            $billing->updateSisa();

            DB::commit();
            return redirect()->route('billing.show', $billing->IdBilling)
                ->with('success', 'Billing berhasil diperbarui.');
        } catch (\Exception $e) {
            DB::rollBack();
            return redirect()->back()
                ->with('error', 'Terjadi kesalahan: ' . $e->getMessage())
                ->withInput();
        }
    }

    /**
     * Remove the specified resource from storage.
     */
    public function destroy(string $id)
    {
        try {
            $billing = Billing::findOrFail($id);
            $billing->delete();

            return redirect()->route('billing.index')
                ->with('success', 'Billing berhasil dihapus.');
        } catch (\Exception $e) {
            return redirect()->back()
                ->with('error', 'Terjadi kesalahan: ' . $e->getMessage());
        }
    }

    /**
     * Process additional payment for billing.
     */
    public function processPayment(Request $request, string $id)
    {
        $validator = Validator::make($request->all(), [
            'jumlah_bayar' => 'required|numeric|min:1',
        ]);

        if ($validator->fails()) {
            return redirect()->back()
                ->withErrors($validator)
                ->withInput();
        }

        DB::beginTransaction();
        try {
            $billing = Billing::findOrFail($id);
            $billing->Dibayar += $request->jumlah_bayar;

            // Update sisa dan status pembayaran
            $billing->updateSisa();

            DB::commit();
            return redirect()->route('billing.show', $billing->IdBilling)
                ->with('success', 'Pembayaran berhasil ditambahkan.');
        } catch (\Exception $e) {
            DB::rollBack();
            return redirect()->back()
                ->with('error', 'Terjadi kesalahan: ' . $e->getMessage())
                ->withInput();
        }
    }
}