<?php

namespace App\Http\Controllers;

use App\Models\Medicine;
use App\Traits\LogsActivity;
use Illuminate\Http\Request;
use Illuminate\View\View;
use Illuminate\Http\RedirectResponse;
use Illuminate\Support\Facades\Storage;
use Maatwebsite\Excel\Facades\Excel;
use App\Imports\MedicineImport;
use App\Exports\MedicineTemplateExport;
use Illuminate\Support\Facades\Gate;

class MedicineController extends Controller
{
    use LogsActivity;

    /**
     * Tampilkan daftar obat-obatan (Index).
     */
    public function index(Request $request): View
{
    // Proteksi Akses
    Gate::authorize('check-access', ['medicines', 'read']);

    $now = now();
    $query = Medicine::query();

    // 1. FILTER KHUSUS (DARI DASHBOARD)
    if ($request->filled('filter')) {
        $filter = $request->get('filter');

        if ($filter === 'expired') {
            // Menampilkan yang sudah lewat tanggal kadaluwarsa
            $query->whereNotNull('expired_at')->where('expired_at', '<', $now);
        } elseif ($filter === 'expiring_soon') {
            // Menampilkan yang akan kadaluwarsa dalam 7 hari kedepan
            $query->whereNotNull('expired_at')
                  ->whereBetween('expired_at', [$now, $now->copy()->addDays(7)]);
        } elseif ($filter === 'low_stock') {
            // Menampilkan stok kritis (<= 5)
            $query->where('qty', '<=', 5);
        }
    }

    // 2. SEARCH GLOBAL
    if ($request->filled('search')) {
        $search = $request->search;
        $query->where(function($q) use ($search) {
            $q->where('nama_obat', 'like', "%{$search}%")
              ->orWhere('kategori', 'like', "%{$search}%")
              ->orWhere('unit', 'like', "%{$search}%");
        });
    }

    // 3. FILTER KATEGORI (Opsional jika ada dropdown di UI)
    if ($request->filled('category')) {
        $query->where('kategori', $request->category);
    }

    // 4. SORTING DINAMIS
    // Gunakan 'expired_at' sebagai default sorting jika dari Dashboard 'expired'
    $allowedSorts = ['nama_obat', 'kategori', 'qty', 'expired_at', 'created_at'];
    $sort = in_array($request->get('sort'), $allowedSorts) ? $request->get('sort') : 'nama_obat';
    $direction = strtolower($request->get('direction')) === 'desc' ? 'desc' : 'asc';

    $medicines = $query->orderBy($sort, $direction)
                       ->paginate(15)
                       ->withQueryString();

    // 5. STATISTIK BOX (Selalu hitung total keseluruhan, bukan hasil filter)
    $totalStock = Medicine::sum('qty'); 
    $lowStockCount = Medicine::where('qty', '<=', 5)->count();
    
    // Menghitung barang yang sudah expired (merah)
    $expiredCount = Medicine::whereNotNull('expired_at')
                            ->where('expired_at', '<', $now)
                            ->count();

    $categories = Medicine::distinct()->whereNotNull('kategori')->pluck('kategori');

    return view('pages.inventory.medicines.index', compact(
        'medicines', 
        'totalStock', 
        'lowStockCount', 
        'expiredCount', // Tambahan statistik baru
        'categories'
    ));
}
    /**
     * Tampilkan form tambah obat.
     */
    public function create(): View
    {
        return view('pages.inventory.medicines.create');
    }

    /**
     * Simpan data obat baru.
     */
    public function store(Request $request): RedirectResponse
    {
        $validated = $request->validate([
            'nama_obat'    => 'required|string|max:255',
            'qty'          => 'required|numeric|min:0',
            'unit'         => 'required|string|max:50',
            'expired_date' => 'nullable|date|after_or_equal:today',
            'foto_produk'  => 'nullable|image|max:1024',
        ]);

        // Catatan: Logika pembuatan slug sudah dipindah ke Model Medicine (event saving)
        // agar Controller lebih ringkas.

        if ($request->hasFile('foto_produk')) {
            $validated['foto_produk'] = $request->file('foto_produk')->store('medicines', 'public');
        }

        $medicine = Medicine::create($validated);
        
        $this->logAction('CREATED_MEDICINE', $medicine, "Menambah obat baru: {$medicine->nama_obat}");

        // FIX: Tambahkan .index agar rute terdeteksi
        return redirect()->route('inventory.medicines.index')->with('success', 'Obat berhasil ditambahkan ke inventori.');
    }

    /**
     * Tampilkan form edit obat.
     */
    public function edit(Medicine $medicine): View
    {
        return view('pages.inventory.medicines.edit', compact('medicine'));
    }

    /**
     * Update data obat.
     */
    public function update(Request $request, Medicine $medicine): RedirectResponse
    {
        $validated = $request->validate([
            'nama_obat'    => 'required|string|max:255',
            'qty'          => 'required|numeric|min:0',
            'unit'         => 'required|string|max:50',
            'expired_date' => 'nullable|date|after_or_equal:today',
            'foto_produk'  => 'nullable|image|max:1024',
        ]);

        if ($request->hasFile('foto_produk')) {
            if ($medicine->foto_produk) {
                Storage::disk('public')->delete($medicine->foto_produk);
            }
            $validated['foto_produk'] = $request->file('foto_produk')->store('medicines', 'public');
        }

        $medicine->update($validated);

        $this->logAction('UPDATED_MEDICINE', $medicine, "Memperbarui data obat: {$medicine->nama_obat}");

        // FIX: Tambahkan .index
        return redirect()->route('inventory.medicines.index')->with('success', 'Data obat berhasil diperbarui.');
    }

    /**
     * Hapus obat.
     */
    public function destroy(Medicine $medicine): RedirectResponse
    {
        if (auth()->user()->role !== 'admin') {
            abort(403, 'Hanya Admin yang diizinkan menghapus data.');
        }

        // Proteksi Integritas rekam medis
        if ($medicine->treatments()->exists()) {
            return back()->with('error', "Gagal: Obat '{$medicine->nama_obat}' sudah tercatat di rekam medis kucing.");
        }

        if ($medicine->foto_produk) {
            Storage::disk('public')->delete($medicine->foto_produk);
        }

        $medicineName = $medicine->nama_obat;

        // PENTING: Log dilakukan SEBELUM delete
        $this->logAction('DELETED_MEDICINE', $medicine, "Menghapus data obat: {$medicineName}");

        $medicine->delete();

        // FIX: Tambahkan .index
        return redirect()->route('inventory.medicines.index')->with('success', 'Data obat berhasil dihapus.');
    }

    /**
     * Fitur Impor Excel
     */
    public function batchUpload(Request $request): RedirectResponse
    {
        $request->validate(['file_excel' => 'required|mimes:xlsx,xls,csv|max:2048']);

        try {
            Excel::import(new MedicineImport, $request->file('file_excel'));
            $this->logAction('BATCH_UPLOAD', null, "Melakukan impor massal data obat");
            
            // FIX: Tambahkan .index
            return redirect()->route('inventory.medicines.index')->with('success', 'Data obat berhasil diimpor.');
        } catch (\Exception $e) {
            return back()->with('error', 'Gagal impor: ' . $e->getMessage());
        }
    }

    /**
     * Download Template Excel
     */
    public function downloadTemplate()
    {
        return Excel::download(new MedicineTemplateExport, 'template_obat_earrin_cats.xlsx');
    }
}