<?php

namespace App\Http\Controllers\Api;

use App\Http\Controllers\Controller;
use App\Models\Location;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Auth;
use Illuminate\Validation\Rule;

class LocationController extends Controller
{
    public function index(): JsonResponse
    {
        $locations = Location::query()->orderBy('name')->paginate(15);

        return response()->json($locations);
    }

    public function store(Request $request): JsonResponse
    {
        $companyId = Auth::user()?->company_id;
        $validated = $request->validate($this->rules($companyId));
        $validated['company_id'] = $companyId;

        $location = Location::create($validated);

        return response()->json($location, 201);
    }

    public function show(Location $location): JsonResponse
    {
        return response()->json($location);
    }

    public function update(Request $request, Location $location): JsonResponse
    {
        $companyId = Auth::user()?->company_id;
        $validated = $request->validate($this->rules($companyId, $location->id));
        $location->update($validated);

        return response()->json($location->fresh());
    }

    public function destroy(Location $location): JsonResponse
    {
        $assignedEmployees = $location->users()->count();
        if ($assignedEmployees > 0) {
            return response()->json([
                'message' => "Location cannot be deleted because it is assigned to {$assignedEmployees} employee(s).",
            ], 422);
        }

        $location->delete();

        return response()->json(['message' => 'Location deleted successfully.']);
    }

    /**
     * @return array<string, mixed>
     */
    private function rules(?int $companyId, ?int $ignoreLocationId = null): array
    {
        $uniqueCodeRule = Rule::unique('locations', 'code')->ignore($ignoreLocationId);
        if ($companyId === null) {
            $uniqueCodeRule = $uniqueCodeRule->where(fn ($query) => $query->whereNull('company_id'));
        } else {
            $uniqueCodeRule = $uniqueCodeRule->where(fn ($query) => $query->where('company_id', $companyId));
        }

        return [
            'name' => ['required', 'string', 'max:191'],
            'code' => ['required', 'string', 'max:100', $uniqueCodeRule],
            'address' => ['nullable', 'string'],
        ];
    }
}