<?php

namespace App\Http\Controllers;

use Illuminate\Http\JsonResponse;
use Illuminate\Support\Facades\DB;

class DashboardController extends Controller
{
    public function index()
    {
        return view('dashboard');
    }

    public function summary(): JsonResponse
    {
        $totalSuppliers = DB::table('PL_SUPPLIERACCOUNT')->count();
        $totalProducts = DB::table('STK_STOCKITEM')->where('ISACTVE', 'Y')->count();
        $totalCustomers = DB::table('SL_CUSTOMERACCOUNT')->count();

        $purchaseSpend = DB::table('PL_BILLTRAN')
            ->selectRaw('COALESCE(SUM(QTYTOINVOICE * COSTPRICE / COSTPRICEPER), 0) as total')
            ->value('total');

        $salesRevenue = DB::table('SL_SALESINVOICETRAN')
            ->selectRaw('COALESCE(SUM(QTYTOINVOICE * SELLINGPRICE / SELLINGPRICEPER), 0) as total')
            ->value('total');

        $salesCost = DB::table('SL_SALESINVOICETRAN')
            ->selectRaw('COALESCE(SUM(QTYTOINVOICE * COSTPRICE / COSTPRICEPER), 0) as total')
            ->value('total');

        $grossProfit = $salesRevenue - $salesCost;
        $margin = $salesRevenue > 0 ? round(($grossProfit / $salesRevenue) * 100, 1) : 0;

        $totalInvoices = DB::table('PL_BILL')->count();

        return response()->json([
            'total_suppliers' => $totalSuppliers,
            'total_products' => $totalProducts,
            'total_customers' => $totalCustomers,
            'purchase_spend' => round($purchaseSpend, 2),
            'sales_revenue' => round($salesRevenue, 2),
            'gross_profit' => round($grossProfit, 2),
            'margin_percent' => $margin,
            'total_invoices' => $totalInvoices,
        ]);
    }

    public function topSuppliers(): JsonResponse
    {
        $suppliers = DB::table('PL_BILLTRAN as il')
            ->join('PL_BILL as i', 'il.REFNO', '=', 'i.REFNO')
            ->selectRaw('i.ACCNO as code, i.SUPLNME as name, COUNT(DISTINCT i.REFNO) as invoice_count, SUM(il.QTYTOINVOICE * il.COSTPRICE / il.COSTPRICEPER) as total_spend, SUM(il.QTYTOINVOICE) as total_qty')
            ->groupBy('i.ACCNO', 'i.SUPLNME')
            ->orderByDesc('total_spend')
            ->limit(10)
            ->get();

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

    public function topProducts(): JsonResponse
    {
        $products = DB::table('SL_SALESINVOICETRAN as sl')
            ->join('STK_STOCKITEM as p', 'sl.STOCKCODE', '=', 'p.STOCKCODE')
            ->selectRaw('sl.STOCKCODE as code, p.DESCRIPTION as name, SUM(sl.QTYTOINVOICE) as total_qty_sold, SUM(sl.QTYTOINVOICE * sl.SELLINGPRICE / sl.SELLINGPRICEPER) as total_revenue, SUM(sl.QTYTOINVOICE * sl.COSTPRICE / sl.COSTPRICEPER) as total_cost')
            ->groupBy('sl.STOCKCODE', 'p.DESCRIPTION')
            ->orderByDesc('total_revenue')
            ->limit(10)
            ->get()
            ->map(function ($item) {
                $item->margin = $item->total_revenue > 0
                    ? round((($item->total_revenue - $item->total_cost) / $item->total_revenue) * 100, 1)
                    : 0;
                return $item;
            });

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

    public function spendOverTime(): JsonResponse
    {
        $data = DB::table('PL_BILLTRAN as il')
            ->join('PL_BILL as i', 'il.REFNO', '=', 'i.REFNO')
            ->selectRaw("DATE_FORMAT(i.DOCDTETME, '%Y-%m') as month, SUM(il.QTYTOINVOICE * il.COSTPRICE / il.COSTPRICEPER) as total_spend")
            ->whereNotNull('i.DOCDTETME')
            ->groupByRaw("DATE_FORMAT(i.DOCDTETME, '%Y-%m')")
            ->orderBy('month')
            ->get();

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

    public function salesOverTime(): JsonResponse
    {
        $data = DB::table('SL_SALESINVOICETRAN as sl')
            ->join('SL_SALESINVOICE as si', 'sl.REFNO', '=', 'si.REFNO')
            ->selectRaw("DATE_FORMAT(si.DOCDTETME, '%Y-%m') as month, SUM(sl.QTYTOINVOICE * sl.SELLINGPRICE / sl.SELLINGPRICEPER) as total_revenue, SUM(sl.QTYTOINVOICE * sl.COSTPRICE / sl.COSTPRICEPER) as total_cost")
            ->whereNotNull('si.DOCDTETME')
            ->groupByRaw("DATE_FORMAT(si.DOCDTETME, '%Y-%m')")
            ->orderBy('month')
            ->get()
            ->map(function ($item) {
                $item->gross_profit = round($item->total_revenue - $item->total_cost, 2);
                return $item;
            });

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

    public function categoryBreakdown(): JsonResponse
    {
        $data = DB::table('SL_SALESINVOICETRAN as sl')
            ->join('STK_STOCKITEM as p', 'sl.STOCKCODE', '=', 'p.STOCKCODE')
            ->leftJoin('STK_STOCKCATEGORY as c', 'p.CATEGORY', '=', 'c.STCKCTGRYCDE')
            ->selectRaw("COALESCE(c.STCKCTGRYDESC, 'Uncategorized') as category, SUM(sl.QTYTOINVOICE * sl.SELLINGPRICE / sl.SELLINGPRICEPER) as revenue, SUM(sl.QTYTOINVOICE * sl.COSTPRICE / sl.COSTPRICEPER) as cost, SUM(sl.QTYTOINVOICE) as qty")
            ->groupByRaw("COALESCE(c.STCKCTGRYDESC, 'Uncategorized')")
            ->orderByDesc('revenue')
            ->get();

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

    public function supplierProducts(string $supplierCode): JsonResponse
    {
        $products = DB::table('PL_BILLTRAN as il')
            ->join('PL_BILL as i', 'il.REFNO', '=', 'i.REFNO')
            ->join('STK_STOCKITEM as p', 'il.STOCKCODE', '=', 'p.STOCKCODE')
            ->where('i.ACCNO', $supplierCode)
            ->selectRaw('il.STOCKCODE as code, p.DESCRIPTION as name, SUM(il.QTYTOINVOICE) as total_qty, SUM(il.QTYTOINVOICE * il.COSTPRICE / il.COSTPRICEPER) as total_spend, COUNT(DISTINCT i.REFNO) as invoice_count')
            ->groupBy('il.STOCKCODE', 'p.DESCRIPTION')
            ->orderByDesc('total_spend')
            ->limit(20)
            ->get();

        $timeline = DB::table('PL_BILLTRAN as il')
            ->join('PL_BILL as i', 'il.REFNO', '=', 'i.REFNO')
            ->where('i.ACCNO', $supplierCode)
            ->selectRaw("DATE_FORMAT(i.DOCDTETME, '%Y-%m') as month, SUM(il.QTYTOINVOICE * il.COSTPRICE / il.COSTPRICEPER) as total_spend")
            ->whereNotNull('i.DOCDTETME')
            ->groupByRaw("DATE_FORMAT(i.DOCDTETME, '%Y-%m')")
            ->orderBy('month')
            ->get();

        $supplierName = DB::table('PL_SUPPLIERACCOUNT')
            ->where('SUPLCDE', $supplierCode)
            ->value('SUPLNME');

        return response()->json([
            'supplier_code' => $supplierCode,
            'supplier_name' => $supplierName,
            'products' => $products,
            'timeline' => $timeline,
        ]);
    }
}