<?php

namespace App\Http\Controllers;

use App\Models\Unit;
use Illuminate\Http\Request;
use App\Support\ApiDataTransformer;
use Illuminate\Support\Facades\Validator;

class UnitController extends Controller
{
    /**
     * Display a listing of the resource.
     */
    public function index()
    {
        $units = Unit::all()->toArray();
        return ApiDataTransformer::snakeToCamel($units);
    }

    /**
     * Store a newly created resource in storage.
     */
    public function store(Request $request)
    {
        $validator = Validator::make($request->all(), [
            'name' => 'required|string|max:50|unique:units',
            'symbol' => 'nullable|string|max:10',
        ]);

        if ($validator->fails()) {
            return response()->json([
                'message' => 'Validation failed',
                'errors' => $validator->errors()
            ], 422);
        }

        // Wandeln Sie die Daten von camelCase in snake_case um
        $data = ApiDataTransformer::camelToSnake($request->all());
        $unit = Unit::create($data);

        return response()->json([
            'message' => 'Unit created successfully',
            'data' => ApiDataTransformer::snakeToCamel($unit->toArray())
        ], 201);
    }

    /**
     * Display the specified resource.
     */
    public function show(Unit $unit)
    {
        return ApiDataTransformer::snakeToCamel($unit->toArray());
    }

    /**
     * Update the specified resource in storage.
     */
    public function update(Request $request, Unit $unit)
    {
        $validator = Validator::make($request->all(), [
            'name' => 'sometimes|required|string|max:50|unique:units,name,' . $unit->id,
            'symbol' => 'nullable|string|max:10',
        ]);

        if ($validator->fails()) {
            return response()->json([
                'message' => 'Validation failed',
                'errors' => $validator->errors()
            ], 422);
        }

        // Wandeln Sie die Daten von camelCase in snake_case um
        $data = ApiDataTransformer::camelToSnake($request->all());
        $unit->update($data);

        return response()->json([
            'message' => 'Unit updated successfully',
            'data' => ApiDataTransformer::snakeToCamel($unit->toArray())
        ]);
    }

    /**
     * Remove the specified resource from storage.
     */
    public function destroy(Unit $unit)
    {
        // Check if the unit is used by any products or line items
        if ($unit->products()->exists() || $unit->lineItems()->exists()) {
            return response()->json([
                'message' => 'Cannot delete unit as it is used by products or line items'
            ], 409);
        }

        $unit->delete();

        return response()->json([
            'message' => 'Unit deleted successfully'
        ]);
    }
}