<?php

namespace App\Http\Controllers;

use App\Models\Customer;
use App\Models\User;
use Illuminate\Http\Request;
use Illuminate\Http\JsonResponse;

class CustomerController extends Controller
{
    /**
     * GET /api/customers
     * List all customers with searching/filtering
     */
    public function index(Request $request): JsonResponse
    {
        $query = Customer::with('sales:id,employee_id,name,color');

        // Search by name, owner, phone, city
        if ($request->has('q') && !empty($request->q)) {
            $search = $request->q;
            $query->where(function ($q) use ($search) {
                $q->where('name', 'like', "%{$search}%")
                    ->orWhere('owner_name', 'like', "%{$search}%")
                    ->orWhere('city', 'like', "%{$search}%")
                    ->orWhere('phone', 'like', "%{$search}%");
            });
        }

        // Filter by sales PIC
        if ($request->has('salesId')) {
            $query->whereHas('sales', function ($q) use ($request) {
                $q->where('employee_id', $request->salesId);
            });
        }

        $customers = $query->orderBy('name', 'asc')->get();

        return response()->json([
            'success' => true,
            'customers' => $customers->map(fn($c) => $this->formatCustomer($c)),
        ]);
    }

    /**
     * POST /api/customers
     * Create new customer (Backend & Mobile Prospect)
     */
    public function store(Request $request): JsonResponse
    {
        $request->validate([
            'name' => 'required|string|max:255',
            'latitude' => 'nullable|numeric',
            'longitude' => 'nullable|numeric',
        ]);

        $picSalesId = null;
        if ($request->has('pic_sales_id')) { // backend sends ID
            $picSalesId = $request->pic_sales_id;
        } elseif ($request->has('user_id')) { // mobile sends employee_id
            $user = User::where('employee_id', $request->user_id)->first();
            if ($user)
                $picSalesId = $user->id;
        }

        $customer = Customer::create([
            'name' => $request->name,
            'address' => $request->address,
            'owner_name' => $request->owner_name,
            'phone' => $request->phone,
            'latitude' => $request->latitude,
            'longitude' => $request->longitude,
            'city' => $request->city,
            'pic_sales_id' => $picSalesId,
        ]);

        return response()->json([
            'success' => true,
            'data' => $this->formatCustomer($customer),
            'message' => 'Customer created successfully',
        ], 201);
    }

    /**
     * GET /api/customers/{id}
     */
    public function show(string $id): JsonResponse
    {
        $customer = Customer::with('sales')->find($id);

        if (!$customer) {
            return response()->json(['success' => false, 'error' => 'Customer not found'], 404);
        }

        return response()->json([
            'success' => true,
            'customer' => $this->formatCustomer($customer),
        ]);
    }

    /**
     * PUT /api/customers/{id}
     */
    public function update(Request $request, string $id): JsonResponse
    {
        $customer = Customer::find($id);

        if (!$customer) {
            return response()->json(['success' => false, 'error' => 'Customer not found'], 404);
        }

        $request->validate([
            'name' => 'sometimes|required|string|max:255',
            'latitude' => 'nullable|numeric',
            'longitude' => 'nullable|numeric',
        ]);

        $data = $request->all();

        // Handle PIC Sales update
        if ($request->has('pic_sales_id')) {
            $data['pic_sales_id'] = $request->pic_sales_id;
        }

        $customer->update($data);

        return response()->json([
            'success' => true,
            'data' => $this->formatCustomer($customer),
            'message' => 'Customer updated successfully',
        ]);
    }

    /**
     * DELETE /api/customers/{id}
     */
    public function destroy(string $id): JsonResponse
    {
        $customer = Customer::find($id);

        if (!$customer) {
            return response()->json(['success' => false, 'error' => 'Customer not found'], 404);
        }

        $customer->delete();

        return response()->json([
            'success' => true,
            'message' => 'Customer deleted successfully',
        ]);
    }

    // Helper format
    private function formatCustomer($c)
    {
        return [
            'id' => (string) $c->id,
            'name' => $c->name,
            'address' => $c->address,
            'owner_name' => $c->owner_name,
            'phone' => $c->phone,
            'latitude' => (float) $c->latitude,
            'longitude' => (float) $c->longitude,
            'city' => $c->city,
            'pic_sales_id' => $c->pic_sales_id ? (string) $c->pic_sales_id : null,
            'pic_sales_name' => $c->sales ? $c->sales->name : null,
            'pic_sales_employee_id' => $c->sales ? $c->sales->employee_id : null,
            'created_at' => $c->created_at->toISOString(),
        ];
    }
}