<?php

namespace App\Http\Controllers\Api;

use App\Http\Controllers\Controller;
use App\Models\CostCenter;
use App\Models\CostCenterKeyword;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Auth;
use Illuminate\Support\Facades\DB;

class CostCenterController extends Controller
{
    /**
     * Listar todos os centros de custo do usuário
     */
    public function index(Request $request): JsonResponse
    {
        $userId = Auth::id();

        // Verificar se o usuário tem um centro de custo do sistema
        // Se não tiver, criar automaticamente o "Geral"
        $hasSystemCostCenter = CostCenter::where('user_id', $userId)
            ->where('is_system', true)
            ->exists();

        if (!$hasSystemCostCenter) {
            CostCenter::create([
                'user_id' => $userId,
                'name' => 'Geral',
                'code' => 'GERAL',
                'description' => 'Centro de custo padrão para transações não categorizadas',
                'color' => '#6c757d',
                'icon' => 'FaFolder',
                'is_active' => true,
                'is_system' => true,
            ]);
        }

        $query = CostCenter::where('user_id', $userId)
            ->with('keywords');

        if ($request->has('is_active')) {
            $query->where('is_active', $request->boolean('is_active'));
        }

        // Ordenar com centro de custo do sistema primeiro, depois por nome
        $costCenters = $query->orderByDesc('is_system')->orderBy('name')->get();

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

    /**
     * Criar novo centro de custo
     */
    public function store(Request $request): JsonResponse
    {
        $validated = $request->validate([
            'name' => 'required|string|max:100',
            'code' => 'nullable|string|max:20|unique:cost_centers,code,NULL,id,user_id,' . Auth::id(),
            'description' => 'nullable|string',
            'color' => 'nullable|string|max:7',
            'icon' => 'nullable|string|max:50',
            'is_active' => 'nullable|boolean',
            'keywords' => 'nullable|array',
            'keywords.*' => 'string|max:100',
        ]);

        $keywords = $validated['keywords'] ?? [];
        unset($validated['keywords']);

        $validated['user_id'] = Auth::id();

        DB::beginTransaction();
        try {
            $costCenter = CostCenter::create($validated);

            // Adicionar palavras-chave
            foreach ($keywords as $keyword) {
                $costCenter->keywords()->create([
                    'keyword' => trim($keyword),
                    'is_case_sensitive' => false,
                    'is_active' => true,
                ]);
            }

            DB::commit();

            return response()->json([
                'success' => true,
                'message' => 'Centro de custo criado com sucesso',
                'data' => $costCenter->load('keywords'),
            ], 201);

        } catch (\Exception $e) {
            DB::rollBack();
            return response()->json([
                'success' => false,
                'message' => 'Erro ao criar centro de custo: ' . $e->getMessage(),
            ], 500);
        }
    }

    /**
     * Exibir um centro de custo específico
     */
    public function show(int $id): JsonResponse
    {
        $costCenter = CostCenter::where('user_id', Auth::id())
            ->with('keywords')
            ->findOrFail($id);

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

    /**
     * Atualizar um centro de custo
     */
    public function update(Request $request, int $id): JsonResponse
    {
        $costCenter = CostCenter::where('user_id', Auth::id())->findOrFail($id);

        // Impedir edição de centro de custo do sistema
        if ($costCenter->is_system) {
            return response()->json([
                'success' => false,
                'message' => 'O centro de custo do sistema não pode ser editado',
            ], 403);
        }

        $validated = $request->validate([
            'name' => 'sometimes|required|string|max:100',
            'code' => 'nullable|string|max:20|unique:cost_centers,code,' . $id . ',id,user_id,' . Auth::id(),
            'description' => 'nullable|string',
            'color' => 'nullable|string|max:7',
            'icon' => 'nullable|string|max:50',
            'is_active' => 'nullable|boolean',
            'keywords' => 'nullable|array',
            'keywords.*' => 'string|max:100',
        ]);

        $keywords = $validated['keywords'] ?? null;
        unset($validated['keywords']);

        DB::beginTransaction();
        try {
            $costCenter->update($validated);

            // Se keywords foram fornecidas, sincronizar
            if ($keywords !== null) {
                // Remover antigas
                $costCenter->keywords()->delete();

                // Adicionar novas
                foreach ($keywords as $keyword) {
                    $costCenter->keywords()->create([
                        'keyword' => trim($keyword),
                        'is_case_sensitive' => false,
                        'is_active' => true,
                    ]);
                }
            }

            DB::commit();

            return response()->json([
                'success' => true,
                'message' => 'Centro de custo atualizado com sucesso',
                'data' => $costCenter->fresh()->load('keywords'),
            ]);

        } catch (\Exception $e) {
            DB::rollBack();
            return response()->json([
                'success' => false,
                'message' => 'Erro ao atualizar centro de custo: ' . $e->getMessage(),
            ], 500);
        }
    }

    /**
     * Deletar um centro de custo (soft delete)
     */
    public function destroy(int $id): JsonResponse
    {
        $costCenter = CostCenter::where('user_id', Auth::id())->findOrFail($id);

        // Impedir exclusão de centro de custo do sistema
        if ($costCenter->is_system) {
            return response()->json([
                'success' => false,
                'message' => 'O centro de custo do sistema não pode ser excluído',
            ], 403);
        }

        $costCenter->keywords()->delete();
        $costCenter->delete();

        return response()->json([
            'success' => true,
            'message' => 'Centro de custo excluído com sucesso',
        ]);
    }

    /**
     * Adicionar palavra-chave a um centro de custo
     */
    public function addKeyword(Request $request, int $id): JsonResponse
    {
        $costCenter = CostCenter::where('user_id', Auth::id())->findOrFail($id);

        $validated = $request->validate([
            'keyword' => 'required|string|max:100',
            'is_case_sensitive' => 'nullable|boolean',
        ]);

        $keyword = $costCenter->keywords()->create([
            'keyword' => trim($validated['keyword']),
            'is_case_sensitive' => $validated['is_case_sensitive'] ?? false,
            'is_active' => true,
        ]);

        return response()->json([
            'success' => true,
            'message' => 'Palavra-chave adicionada com sucesso',
            'data' => $keyword,
        ], 201);
    }

    /**
     * Remover palavra-chave de um centro de custo
     */
    public function removeKeyword(int $id, int $keywordId): JsonResponse
    {
        $costCenter = CostCenter::where('user_id', Auth::id())->findOrFail($id);
        $keyword = $costCenter->keywords()->findOrFail($keywordId);
        $keyword->delete();

        return response()->json([
            'success' => true,
            'message' => 'Palavra-chave removida com sucesso',
        ]);
    }

    /**
     * Encontrar centro de custo por texto (usando palavras-chave)
     */
    public function matchByText(Request $request): JsonResponse
    {
        $validated = $request->validate([
            'text' => 'required|string',
        ]);

        $text = $validated['text'];
        $textLower = strtolower($text);

        $keywords = CostCenterKeyword::whereHas('costCenter', function ($query) {
            $query->where('user_id', Auth::id())->where('is_active', true);
        })
            ->where('is_active', true)
            ->with('costCenter')
            ->get();

        $matches = [];
        foreach ($keywords as $keyword) {
            $searchText = $keyword->is_case_sensitive ? $text : $textLower;
            $searchKeyword = $keyword->is_case_sensitive ? $keyword->keyword : strtolower($keyword->keyword);

            if (str_contains($searchText, $searchKeyword)) {
                $matches[] = [
                    'cost_center' => $keyword->costCenter,
                    'matched_keyword' => $keyword->keyword,
                ];
            }
        }

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