<?php

namespace App\Http\Controllers\Api;

use App\Http\Controllers\Controller;
use App\Models\BusinessSetting;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Validator;

class BusinessSettingController extends Controller
{
    /**
     * Lista todas as configurações de negócio do usuário
     */
    public function index(Request $request): JsonResponse
    {
        $userId = $request->user()->id;
        
        $settings = BusinessSetting::ofUser($userId)
            ->orderBy('is_active', 'desc')
            ->orderBy('name')
            ->get()
            ->map(function ($setting) {
                return array_merge($setting->toArray(), [
                    'fixed_expenses_rate' => $setting->fixed_expenses_rate,
                    'total_variable_costs' => $setting->total_variable_costs,
                    'markup_breakdown' => $setting->markup_breakdown,
                ]);
            });
        
        return response()->json($settings);
    }

    /**
     * Cria uma nova configuração de negócio
     */
    public function store(Request $request): JsonResponse
    {
        $validator = Validator::make($request->all(), [
            'name' => 'required|string|max:255',
            'currency' => 'required|string|size:3',
            'business_type' => 'sometimes|in:products,services,both',
            'employees_count' => 'sometimes|integer|min:1',
            'hours_per_week' => 'sometimes|numeric|min:1|max:168',
            'working_days_per_week' => 'sometimes|integer|min:1|max:7',
            'working_days_per_month' => 'sometimes|integer|min:1|max:31',
            'productivity_rate' => 'sometimes|numeric|min:1|max:100',
            'monthly_revenue' => 'required|numeric|min:0',
            'fixed_expenses' => 'required|numeric|min:0',
            'tax_rate' => 'required|numeric|min:0|max:100',
            'price_includes_tax' => 'sometimes|boolean',
            'vat_rate' => 'sometimes|numeric|min:0|max:100',
            'sales_commission' => 'required|numeric|min:0|max:100',
            'card_fee' => 'required|numeric|min:0|max:100',
            'other_variable_costs' => 'nullable|numeric|min:0|max:100',
            'investment_rate' => 'required|numeric|min:0|max:100',
            'profit_margin' => 'required|numeric|min:0|max:100',
        ]);

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

        $data = $validator->validated();
        $data['user_id'] = $request->user()->id;
        $data['other_variable_costs'] = $data['other_variable_costs'] ?? 0;

        $setting = BusinessSetting::create($data);
        
        // Calcular e salvar o markup
        $setting->recalculateMarkup();
        
        // Recarregar com os dados calculados
        $setting->refresh();

        return response()->json(array_merge($setting->toArray(), [
            'fixed_expenses_rate' => $setting->fixed_expenses_rate,
            'total_variable_costs' => $setting->total_variable_costs,
            'markup_breakdown' => $setting->markup_breakdown,
        ]), 201);
    }

    /**
     * Exibe uma configuração específica
     */
    public function show(Request $request, $id): JsonResponse
    {
        $setting = BusinessSetting::ofUser($request->user()->id)
            ->with('productSheets')
            ->findOrFail($id);

        return response()->json(array_merge($setting->toArray(), [
            'fixed_expenses_rate' => $setting->fixed_expenses_rate,
            'total_variable_costs' => $setting->total_variable_costs,
            'markup_breakdown' => $setting->markup_breakdown,
        ]));
    }

    /**
     * Atualiza uma configuração
     */
    public function update(Request $request, $id): JsonResponse
    {
        $setting = BusinessSetting::ofUser($request->user()->id)->findOrFail($id);

        $validator = Validator::make($request->all(), [
            'name' => 'sometimes|string|max:255',
            'currency' => 'sometimes|string|size:3',
            'business_type' => 'sometimes|in:products,services,both',
            'employees_count' => 'sometimes|integer|min:1',
            'hours_per_week' => 'sometimes|numeric|min:1|max:168',
            'working_days_per_week' => 'sometimes|integer|min:1|max:7',
            'working_days_per_month' => 'sometimes|integer|min:1|max:31',
            'productivity_rate' => 'sometimes|numeric|min:1|max:100',
            'monthly_revenue' => 'sometimes|numeric|min:0',
            'fixed_expenses' => 'sometimes|numeric|min:0',
            'tax_rate' => 'sometimes|numeric|min:0|max:100',
            'price_includes_tax' => 'sometimes|boolean',
            'vat_rate' => 'sometimes|numeric|min:0|max:100',
            'sales_commission' => 'sometimes|numeric|min:0|max:100',
            'card_fee' => 'sometimes|numeric|min:0|max:100',
            'other_variable_costs' => 'sometimes|numeric|min:0|max:100',
            'investment_rate' => 'sometimes|numeric|min:0|max:100',
            'profit_margin' => 'sometimes|numeric|min:0|max:100',
            'is_active' => 'sometimes|boolean',
        ]);

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

        $setting->update($validator->validated());
        
        // Recalcular markup
        $setting->recalculateMarkup();
        
        $setting->refresh();

        return response()->json(array_merge($setting->toArray(), [
            'fixed_expenses_rate' => $setting->fixed_expenses_rate,
            'total_variable_costs' => $setting->total_variable_costs,
            'markup_breakdown' => $setting->markup_breakdown,
        ]));
    }

    /**
     * Remove uma configuração
     */
    public function destroy(Request $request, $id): JsonResponse
    {
        $setting = BusinessSetting::ofUser($request->user()->id)->findOrFail($id);
        
        // Verificar se há fichas técnicas vinculadas
        if ($setting->productSheets()->count() > 0) {
            return response()->json([
                'message' => 'Não é possível excluir: existem fichas técnicas vinculadas a esta configuração.'
            ], 422);
        }
        
        $setting->delete();

        return response()->json(['message' => 'Configuração excluída com sucesso']);
    }

    /**
     * Recalcula o markup de uma configuração
     */
    public function recalculateMarkup(Request $request, $id): JsonResponse
    {
        $setting = BusinessSetting::ofUser($request->user()->id)->findOrFail($id);
        
        $markup = $setting->recalculateMarkup();

        return response()->json([
            'markup_factor' => $markup,
            'markup_breakdown' => $setting->markup_breakdown,
        ]);
    }

    /**
     * Simula um preço de venda dado um CMV
     */
    public function simulatePrice(Request $request, $id): JsonResponse
    {
        $setting = BusinessSetting::ofUser($request->user()->id)->findOrFail($id);

        $validator = Validator::make($request->all(), [
            'cmv' => 'required|numeric|min:0',
        ]);

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

        $cmv = $request->cmv;
        $salePrice = $setting->calculateSalePrice($cmv);
        $contributionMargin = $salePrice - $cmv;
        $contributionMarginPercent = $salePrice > 0 ? round(($contributionMargin / $salePrice) * 100, 2) : 0;

        return response()->json([
            'cmv' => $cmv,
            'markup_factor' => $setting->markup_factor,
            'sale_price' => $salePrice,
            'contribution_margin' => $contributionMargin,
            'contribution_margin_percent' => $contributionMarginPercent,
            'currency' => $setting->currency,
            'breakdown' => $setting->markup_breakdown,
        ]);
    }

    /**
     * Retorna a configuração ativa padrão do usuário
     */
    public function getDefault(Request $request): JsonResponse
    {
        $setting = BusinessSetting::ofUser($request->user()->id)
            ->active()
            ->first();

        if (!$setting) {
            return response()->json(['message' => 'Nenhuma configuração ativa encontrada'], 404);
        }

        return response()->json(array_merge($setting->toArray(), [
            'fixed_expenses_rate' => $setting->fixed_expenses_rate,
            'total_variable_costs' => $setting->total_variable_costs,
            'markup_breakdown' => $setting->markup_breakdown,
        ]));
    }
}