<?php

namespace App\Http\Controllers\Finance;

use App\Http\Controllers\Controller;
use App\Models\Finance\Receivable;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;

class ReceivableController extends Controller
{
    public function index(Request $request): JsonResponse
    {
        $tenantId = session('selected_tenant_id', 1);

        $query = Receivable::forTenant($tenantId);

        if ($search = $request->input('search')) {
            $query->where(function ($q) use ($search) {
                $q->where('customer_name', 'like', "%{$search}%")
                  ->orWhere('invoice_no', 'like', "%{$search}%");
            });
        }

        if ($status = $request->input('status')) {
            if ($status !== 'all') {
                $query->where('status', $status);
            }
        }

        if ($category = $request->input('category')) {
            if ($category !== 'all') {
                $query->where('category', $category);
            }
        }

        $receivables = $query->orderBy('created_at', 'desc')
            ->get()
            ->map(function ($item) {
                return [
                    'id' => $item->id,
                    'customerName' => $item->customer_name,
                    'invoiceNo' => $item->invoice_no,
                    'issueDate' => $item->issue_date?->format('Y-m-d'),
                    'dueDate' => $item->due_date?->format('Y-m-d'),
                    'category' => $item->category,
                    'amount' => $item->amount,
                    'collectedAmount' => $item->collected_amount,
                    'status' => $item->status,
                    'description' => $item->description,
                    'memo' => $item->memo,
                ];
            });

        $allQuery = Receivable::forTenant($tenantId);
        $all = (clone $allQuery)->get();

        $totalAmount = $all->sum('amount');
        $totalCollected = $all->sum('collected_amount');
        $overdueAmount = $all->where('status', 'overdue')->sum(function ($item) {
            return $item->amount - $item->collected_amount;
        });

        $stats = [
            'totalAmount' => $totalAmount,
            'totalCollected' => $totalCollected,
            'totalOutstanding' => $totalAmount - $totalCollected,
            'overdueAmount' => $overdueAmount,
            'count' => $all->count(),
        ];

        return response()->json([
            'success' => true,
            'data' => $receivables,
            'stats' => $stats,
        ]);
    }

    public function store(Request $request): JsonResponse
    {
        $request->validate([
            'customerName' => 'required|string|max:100',
            'invoiceNo' => 'required|string|max:50',
            'amount' => 'required|integer|min:0',
        ]);

        $tenantId = session('selected_tenant_id', 1);

        $receivable = Receivable::create([
            'tenant_id' => $tenantId,
            'customer_name' => $request->input('customerName'),
            'invoice_no' => $request->input('invoiceNo'),
            'issue_date' => $request->input('issueDate'),
            'due_date' => $request->input('dueDate'),
            'category' => $request->input('category', '서비스'),
            'amount' => $request->input('amount', 0),
            'collected_amount' => 0,
            'status' => 'outstanding',
            'description' => $request->input('description'),
            'memo' => $request->input('memo'),
        ]);

        return response()->json([
            'success' => true,
            'message' => '미수금이 등록되었습니다.',
        ]);
    }

    public function update(Request $request, int $id): JsonResponse
    {
        $tenantId = session('selected_tenant_id', 1);
        $receivable = Receivable::forTenant($tenantId)->findOrFail($id);

        $request->validate([
            'customerName' => 'required|string|max:100',
            'invoiceNo' => 'required|string|max:50',
            'amount' => 'required|integer|min:0',
        ]);

        $receivable->update([
            'customer_name' => $request->input('customerName'),
            'invoice_no' => $request->input('invoiceNo'),
            'issue_date' => $request->input('issueDate'),
            'due_date' => $request->input('dueDate'),
            'category' => $request->input('category'),
            'amount' => $request->input('amount'),
            'status' => $request->input('status', $receivable->status),
            'description' => $request->input('description'),
            'memo' => $request->input('memo'),
        ]);

        return response()->json([
            'success' => true,
            'message' => '미수금이 수정되었습니다.',
        ]);
    }

    public function collect(Request $request, int $id): JsonResponse
    {
        $tenantId = session('selected_tenant_id', 1);
        $receivable = Receivable::forTenant($tenantId)->findOrFail($id);

        $request->validate([
            'collectAmount' => 'required|integer|min:1',
        ]);

        $collectAmount = $request->input('collectAmount');
        $remaining = $receivable->amount - $receivable->collected_amount;

        if ($collectAmount > $remaining) {
            return response()->json([
                'success' => false,
                'message' => '수금액이 잔액을 초과합니다.',
            ], 422);
        }

        $newCollected = $receivable->collected_amount + $collectAmount;
        $newStatus = $newCollected >= $receivable->amount ? 'collected' : 'partial';

        $receivable->update([
            'collected_amount' => $newCollected,
            'status' => $newStatus,
        ]);

        return response()->json([
            'success' => true,
            'message' => '수금 처리되었습니다.',
        ]);
    }

    public function destroy(int $id): JsonResponse
    {
        $tenantId = session('selected_tenant_id', 1);
        $receivable = Receivable::forTenant($tenantId)->findOrFail($id);
        $receivable->delete();

        return response()->json([
            'success' => true,
            'message' => '미수금이 삭제되었습니다.',
        ]);
    }
}