<?php
declare(strict_types=1);

namespace App\Http\Controllers;

use App\Enums\Market\ProductTransactionType;
use App\Enums\Market\TransactionFlow;
use App\Enums\UserTypes;
use App\Http\Controllers\Helpers\ResponseHelper;
use App\Models\GlobalTransaction;
use App\Models\Market\Product;
use App\Models\Market\Store;
use Hypervel\Http\Request;
use Hypervel\Support\Facades\Auth;
use Hypervel\Support\Facades\Validator;
use App\Http\Controllers\Helpers\UserController;
use App\Http\Controllers\Helpers\Permissions\UserPermissions;
use App\Enums\UserActions;

class GlobalTransactionController
{
    /**
     * List transactions with optional filtering.
     * Handles POST /admin/transactions/list
     */
    public function list(Request $request)
    {
        if (!UserPermissions::isActionPermitted(Auth::user()->acct_type, UserActions::ViewGlobalTransactions)) {
            return ResponseHelper::returnUnauthorized();
        }

        $user = Auth::user();

        $productIdHash = $request->input('product_id');
        $storeIdHash = $request->input('store_id');
        
        $query = GlobalTransaction::with(['user:id,name,hashkey', 'product:id,name,hashkey', 'store:id,name,hashkey']);

        if ($productIdHash) {
            $product = Product::where('hashkey', $productIdHash)->first();
            if ($product) {
                $query->where('product_id', $product->id);
            } else {
                return response()->json([]);
            }
        }

        if ($storeIdHash) {
            $store = Store::where('hashkey', $storeIdHash)->first();
            if ($store) {
                $query->where('store_id', $store->id);
            }
        }

        // Access Control: Ultimate can see everything. 
        // Others see transactions they created or relate to them.
        if ($user->acct_type !== UserTypes::ULTIMATE) {
            $query->where(function($q) use ($user) {
                $q->where('user_id', $user->id)
                  ->orWhere('created_by', $user->id);
            });
        }

        $transactions = $query->orderBy('created_at', 'desc')->get();

        // Transform for frontend
        $transformed = $transactions->map(function ($tx) {
            return [
                'id' => $tx->id,
                'hashkey' => $tx->hashkey,
                'amount' => $tx->amount,
                'type' => $tx->type ? $tx->type->label() : 'Unknown',
                'status' => $tx->status,
                'description' => $tx->description,
                'created_at' => $tx->created_at,
                'flow' => $tx->flow ? [
                    'value' => $tx->flow->value,
                    'label' => match($tx->flow) {
                        TransactionFlow::INCOME => 'Income',
                        TransactionFlow::EXPENSE => 'Expense',
                        TransactionFlow::NEUTRAL => 'Neutral',
                        default => 'Unknown'
                    }
                ] : null,
                'user' => $tx->user ? $tx->user->name : null,
                'product' => $tx->product ? $tx->product->name : null,
                'store' => $tx->store ? $tx->store->name : null,
            ];
        });

        return response()->json($transformed);
    }

    /**
     * Create a new global transaction.
     * Handles POST /admin/transactions/create
     */
    public function store(Request $request)
    {
        if (!UserPermissions::isActionPermitted(Auth::user()->acct_type, UserActions::CreateGlobalTransaction)) {
            return ResponseHelper::returnUnauthorized();
        }

        $user = Auth::user();

        $validator = Validator::make($request->all(), [
            'user_hash' => 'nullable|string',
            'amount' => 'required|numeric',
            'type' => 'required|integer',
            'description' => 'nullable|string',
            'product_hash' => 'nullable|string',
            'store_hash' => 'nullable|string',
            'status' => 'nullable|string',
        ]);

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

        $data = $validator->validated();
        
        // Resolve IDs from hashes
        $targetUserId = $user->id;
        if (isset($data['user_hash'])) {
            $targetUser = UserController::findUserIdByHash($data['user_hash']);
            if ($targetUser) $targetUserId = $targetUser;
        }

        $productId = null;
        if (isset($data['product_hash'])) {
            $product = Product::where('hashkey', $data['product_hash'])->first();
            if ($product) $productId = $product->id;
        }

        $storeId = null;
        if (isset($data['store_hash'])) {
            $store = Store::where('hashkey', $data['store_hash'])->first();
            if ($store) $storeId = $store->id;
        }

        /** @var GlobalTransaction $transaction */
        $transaction = GlobalTransaction::create([
            'user_id' => $targetUserId,
            'amount' => $data['amount'],
            'type' => $data['type'],
            'description' => $data['description'] ?? '',
            'product_id' => $productId,
            'store_id' => $storeId,
            'status' => $data['status'] ?? 'completed',
            'flow' => $request->has('flow') ? $request->input('flow') : ProductTransactionType::from($data['type'])->flow(),
            'created_by' => $user->id,
        ]);

        return response()->json([
            'success' => true,
            'message' => 'Transaction recorded successfully',
            'hashkey' => $transaction->hashkey
        ]);
    }

    /**
     * Get all product transaction types for dropdown selection.
     */
    public function getTypes()
    {
        $types = collect(ProductTransactionType::cases())->map(function ($type) {
            return [
                'value' => $type->value,
                'label' => $type->label(),
                'flow' => $type->flow()->value,
                'flow_label' => $type->flow()->name
            ];
        });

        return response()->json($types);
    }
}