<?php

namespace App\Http\Controllers;

use App\Models\Cat;
use App\Models\Treatment;
use App\Models\Medicine;
use App\Models\TreatmentDetail; // Menambahkan model Detail
use App\Traits\LogsActivity;
use Illuminate\Http\Request;
use Illuminate\View\View;
use Illuminate\Http\RedirectResponse;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Storage;
use Exception;

class TreatmentController extends Controller
{
    use LogsActivity;

    /**
     * Menampilkan daftar rekam medis dengan optimasi Eager Loading & Filtering.
     */
   public function index(Request $request): View|\Symfony\Component\HttpFoundation\BinaryFileResponse
{
    // 1. QUERY DASAR DENGAN OPTIMASI EAGER LOADING
    $query = Treatment::with([
        'cat:id,nama_kucing,foto,treatment_status', 
        'details.medicine:id,nama_obat,unit', 
        'user:id,name' 
    ])
    ->whereHas('cat', function($q) {
        $q->where('treatment_status', 1);
    });

    // 2. LOGIKA FILTERING DINAMIS
    if ($request->filled('search')) {
        $query->whereHas('cat', function($q) use ($request) {
            $q->where('nama_kucing', 'like', '%' . $request->search . '%');
        });
    }

    if ($request->filled('pic_id')) {
        $query->where('user_id', $request->pic_id);
    }

    if ($request->filled('start_date') && $request->filled('end_date')) {
        $query->whereBetween('tanggal', [$request->start_date, $request->end_date]);
    }

    // 3. LOGIKA EXPORT (Pastikan blok IF ditutup dengan benar)
    if ($request->filled('export')) {
        $exportData = new \App\Exports\TreatmentExport($request);
        $fileName = 'Report_Active_Treatment_' . now()->format('Ymd_His');

        if ($request->export === 'excel') {
            return \Maatwebsite\Excel\Facades\Excel::download($exportData, "{$fileName}.xlsx");
        }

        if ($request->export === 'pdf') {
            return \Maatwebsite\Excel\Facades\Excel::download($exportData, "{$fileName}.pdf", \Maatwebsite\Excel\Excel::DOMPDF);
        }
    } // <--- Pastikan kurung ini menutup blok export, bukan menutup fungsi index

    // 4. EKSEKUSI DATA UNTUK VIEW (Line 67)
    $treatments = $query->latest('tanggal')->paginate(20)->withQueryString();
    
    $pics = \App\Models\User::select('id', 'name')->orderBy('name')->get();

    return view('pages.treatments.index', compact('treatments', 'pics'));
}

    /**
     * Form tambah rekam medis.
     */
    public function create(Request $request): View
    {
        $selectedCat = null;
        if ($request->filled('cat_id')) {
            $selectedCat = Cat::select('id', 'nama_kucing', 'ras')->findOrFail($request->cat_id);
            $cats = collect([$selectedCat]); 
        } else {
            $cats = Cat::select('id', 'nama_kucing', 'ras')->get();
        }

        // Menampilkan semua obat (termasuk stok 0 untuk kebutuhan edit/view, 
        // namun di filter di frontend untuk input baru)
        $medicines = Medicine::orderBy('nama_obat', 'asc')->get();

        return view('pages.treatments.create', compact('selectedCat', 'cats', 'medicines'));
    }

    /**
     * Simpan rekam medis baru & potong stok (Mendukung Multi-Obat).
     */
   public function store(Request $request): \Illuminate\Http\RedirectResponse
    {
        $validated = $this->validateTreatment($request);

        $fotoPath = null;
        if ($request->hasFile('foto_bukti')) {
            $fotoPath = $request->file('foto_bukti')->store('treatments', 'public');
        }

        try {
            return \Illuminate\Support\Facades\DB::transaction(function () use ($request, $fotoPath) {
                
                $userId = auth()->id() ?? 1;
                $firstTreatment = null;

                if ($request->filled('items')) {
                    foreach ($request->items as $item) {
                        $medicine = \App\Models\Medicine::findOrFail($item['medicine_id']);

                        if ($medicine->qty < $item['qty_used']) {
                            throw new \Exception("Stok {$medicine->nama_obat} tidak mencukupi (Sisa: {$medicine->qty}).");
                        }

                        $treatment = \App\Models\Treatment::create([
                            'cat_id'           => $request->cat_id,
                            'user_id'          => $userId,
                            'tanggal'          => $request->tanggal,
                            'keluhan'          => $request->keluhan,
                            
                            // Langsung masukkan diagnosa tanpa embel-embel
                            'diagnosa'         => $request->diagnosa, 
                            
                            'foto_bukti'       => $fotoPath, 
                            'status_perawatan' => 1, 
                            'medicine_id'      => $item['medicine_id'],
                            'qty_used'         => $item['qty_used'], 
                        ]);

                        if (!$firstTreatment) {
                            $firstTreatment = $treatment;
                        }

                        $medicine->decrement('qty', $item['qty_used']);
                    }
                }

                \App\Models\Cat::where('id', $request->cat_id)->update(['treatment_status' => 1]);

                if ($firstTreatment) {
                    $this->logAction('TREATED', $firstTreatment, "Mencatat pengobatan klinis untuk " . $firstTreatment->cat->nama_kucing);
                }

                return redirect()->route('cats.show', $request->cat_id)
                    ->with('success', 'Rekam medis klinis berhasil dicatat dan stok dipotong otomatis.');
            });

        } catch (\Exception $e) {
            if ($fotoPath && \Illuminate\Support\Facades\Storage::disk('public')->exists($fotoPath)) {
                \Illuminate\Support\Facades\Storage::disk('public')->delete($fotoPath);
            }
            return back()->withInput()->with('error', 'Gagal menyimpan: ' . $e->getMessage());
        }
    }
    /**
     * Menampilkan detail spesifik satu rekam medis.
     */
    public function show(Treatment $treatment): View
    {
        // Load details untuk menampilkan list obat
        $treatment->load(['cat', 'medicine', 'user', 'details.medicine']);
        return view('pages.treatments.show', compact('treatment'));
    }

    /**
     * Form edit rekam medis.
     */
    public function edit(Treatment $treatment): View
    {
        $treatment->load('details');
        $cats = Cat::select('id', 'nama_kucing', 'ras')->get();
        $medicines = Medicine::orderBy('nama_obat', 'asc')->get();
        
        return view('pages.treatments.edit', compact('treatment', 'cats', 'medicines'));
    }

    /**
     * Update rekam medis & sinkronisasi ulang stok desimal (Multi-Obat).
     */
    public function update(Request $request, Treatment $treatment)
    {
        // 1. Validasi Input
        $validated = $this->validateTreatment($request);

        try {
            return DB::transaction(function () use ($request, $treatment) {
                
                // 2. Kelola Foto Bukti (Hapus yang lama jika ada foto baru)
                $fotoPath = $treatment->foto_bukti; 
                if ($request->hasFile('foto_bukti')) {
                    if ($fotoPath && \Illuminate\Support\Facades\Storage::disk('public')->exists($fotoPath)) {
                        \Illuminate\Support\Facades\Storage::disk('public')->delete($fotoPath);
                    }
                    $fotoPath = $request->file('foto_bukti')->store('treatments', 'public');
                }

                // 3. KEMBALIKAN STOK OBAT LAMA (Penting agar stok tidak bocor)
                $oldMedicine = \App\Models\Medicine::find($treatment->medicine_id);
                if ($oldMedicine) {
                    $oldMedicine->increment('qty', $treatment->qty_used);
                }

                // 4. Ambil data obat PERTAMA dari form untuk memperbarui data saat ini (ID 9)
                $firstItem = $request->items[0];
                $newMedicine = \App\Models\Medicine::findOrFail($firstItem['medicine_id']);

                if ($newMedicine->qty < $firstItem['qty_used']) {
                    throw new Exception("Stok {$newMedicine->nama_obat} tidak mencukupi (Sisa: {$newMedicine->qty}).");
                }

                // Format Diagnosa (Gabungan Diagnosa Utama + Dosis/Ket)
                $catatanDosis = isset($firstItem['dosis']) ? " | Dosis: " . $firstItem['dosis'] : "";
                $catatanKet = isset($firstItem['keterangan']) && $firstItem['keterangan'] != '' ? " (" . $firstItem['keterangan'] . ")" : "";
                $diagnosaFinal = $request->diagnosa . $catatanDosis . $catatanKet;

                // EKSEKUSI UPDATE REKAM MEDIS (Tanpa kolom nama_obat!)
                $treatment->update([
                    'cat_id'      => $request->cat_id,
                    'tanggal'     => $request->tanggal,
                    'keluhan'     => $request->keluhan,
                    'diagnosa'    => $diagnosaFinal,
                    'foto_bukti'  => $fotoPath,
                    'medicine_id' => $firstItem['medicine_id'],
                    'qty_used'    => $firstItem['qty_used'],
                ]);

                // Potong stok obat pertama
                $newMedicine->decrement('qty', $firstItem['qty_used']);

                // 5. JIKA STAF MENAMBAHKAN OBAT EKSTRA DI HALAMAN EDIT
                // Buat sebagai record baru agar data tidak hilang
                if (count($request->items) > 1) {
                    for ($i = 1; $i < count($request->items); $i++) {
                        $extraItem = $request->items[$i];
                        $extraMed = \App\Models\Medicine::findOrFail($extraItem['medicine_id']);

                        if ($extraMed->qty < $extraItem['qty_used']) {
                            throw new Exception("Stok {$extraMed->nama_obat} tidak mencukupi.");
                        }

                        $catatanDosisEx = isset($extraItem['dosis']) ? " | Dosis: " . $extraItem['dosis'] : "";
                        $catatanKetEx = isset($extraItem['keterangan']) && $extraItem['keterangan'] != '' ? " (" . $extraItem['keterangan'] . ")" : "";
                        $diagnosaFinalEx = $request->diagnosa . $catatanDosisEx . $catatanKetEx;

                        \App\Models\Treatment::create([
                            'cat_id'           => $request->cat_id,
                            'user_id'          => auth()->id() ?? 1,
                            'tanggal'          => $request->tanggal,
                            'keluhan'          => $request->keluhan,
                            'diagnosa'         => $diagnosaFinalEx,
                            'foto_bukti'       => $fotoPath, 
                            'status_perawatan' => $treatment->status_perawatan, // Ikuti status (Misal: 1 / Aktif)
                            'medicine_id'      => $extraItem['medicine_id'],
                            'qty_used'         => $extraItem['qty_used'],
                        ]);

                        $extraMed->decrement('qty', $extraItem['qty_used']);
                    }
                }

                // 6. Sinkronisasi Kucing & Log Activity
                \App\Models\Cat::where('id', $request->cat_id)->update(['treatment_status' => 1]);
                $this->logAction('UPDATED', $treatment, "Memperbarui rekam medis klinis untuk " . $treatment->cat->nama_kucing);

                return redirect()->route('cats.show', $request->cat_id)
                    ->with('success', 'Rekam medis berhasil diperbarui dan stok obat disesuaikan ulang secara otomatis!');
            });

        } catch (Exception $e) {
            return back()->withInput()->with('error', 'Gagal memperbarui: ' . $e->getMessage());
        }
    }

    /**
     * Hapus rekam medis & kembalikan semua stok obat terkait.
     */
    public function destroy(Treatment $treatment): RedirectResponse
    {
        try {
            DB::transaction(function () use ($treatment) {
                // Kembalikan semua stok dari tabel detail
                foreach ($treatment->details as $detail) {
                    Medicine::where('id', $detail->medicine_id)->increment('qty', $detail->qty_used);
                }

                if ($treatment->foto_bukti) {
                    Storage::disk('public')->delete($treatment->foto_bukti);
                }
                
                $this->logAction('DELETED_TREATMENT', $treatment, "Menghapus catatan medis kucing: {$treatment->cat->nama_kucing}");
                
                // Delete otomatis menghapus details karena cascade di migration
                $treatment->delete();
            });

            return back()->with('success', 'Data rekam medis dihapus dan semua stok obat dikembalikan.');
        } catch (Exception $e) {
            return back()->with('error', 'Gagal menghapus data: ' . $e->getMessage());
        }
    }
private function validateTreatment(Request $request)
    {
        return $request->validate([
            'cat_id'      => 'required|exists:cats,id',
            'tanggal'     => 'required|date',
            'keluhan'     => 'required|string|max:255',
            'diagnosa'    => 'required|string',
            'foto_bukti'  => 'nullable|image|max:2048',
            
            // Validasi untuk Single Medicine
            'medicine_id' => 'required_without:items|nullable|exists:medicines,id',
            'qty_used'    => 'required_without:items|nullable|numeric|min:0',
          
            // Validasi untuk Multi Medicine
            // FIX: Wajibkan array items jika mode single (medicine_id) kosong
            'items'                 => 'required_without:medicine_id|nullable|array', 
            'items.*.medicine_id'   => 'required_with:items|exists:medicines,id',
            'items.*.qty_used'      => 'required_with:items|numeric|min:0.01',
           
        ], [
            // Pesan Error Custom (Opsional, agar lebih mudah di-debug)
            'items.required_without' => 'Anda harus memasukkan minimal 1 obat.',
            'items.*.medicine_id.required_with' => 'Ada pilihan obat yang masih kosong di daftar.',
            'items.*.qty_used.required_with' => 'Jumlah (Qty) obat harus diisi.',
           
        ]);
    }
}