<?php

namespace App\Http\Controllers\Admin;

use App\Http\Controllers\Controller;
use App\Models\AccountingEntry;
use App\Models\ChartOfAccount;
use Illuminate\Http\Request;

class GeneralLedgerController extends Controller
{
    /**
     * Display the general ledger
     */
    public function index(Request $request)
    {
        $accounts = ChartOfAccount::where('is_active', true)
            ->orderBy('account_code')
            ->get();

        $selectedAccountId = $request->input('account_id');
        $startDate = $request->input('start_date', now()->startOfYear()->format('Y-m-d'));
        $endDate = $request->input('end_date', now()->format('Y-m-d'));

        $entries = null;
        $selectedAccount = null;
        $openingBalance = 0;
        $debitTotal = 0;
        $creditTotal = 0;
        $closingBalance = 0;

        if ($selectedAccountId) {
            $selectedAccount = ChartOfAccount::findOrFail($selectedAccountId);

            // Get opening balance (all entries before start date)
            $openingDebit = AccountingEntry::where('chart_of_account_id', $selectedAccountId)
                ->where('entry_date', '<', $startDate)
                ->where('entry_type', AccountingEntry::ENTRY_TYPE_DEBIT)
                ->sum('amount');

            $openingCredit = AccountingEntry::where('chart_of_account_id', $selectedAccountId)
                ->where('entry_date', '<', $startDate)
                ->where('entry_type', AccountingEntry::ENTRY_TYPE_CREDIT)
                ->sum('amount');

            // Calculate opening balance based on account type
            if (in_array($selectedAccount->account_type, ['asset', 'expense'])) {
                // Assets and Expenses: Debit increases, Credit decreases
                $openingBalance = $openingDebit - $openingCredit;
            } else {
                // Liabilities, Equity, Income: Credit increases, Debit decreases
                $openingBalance = $openingCredit - $openingDebit;
            }

            // Get entries for the period
            $entries = AccountingEntry::with(['financeDocument', 'chartOfAccount'])
                ->where('chart_of_account_id', $selectedAccountId)
                ->whereBetween('entry_date', [$startDate, $endDate])
                ->orderBy('entry_date')
                ->orderBy('id')
                ->get();

            // Calculate totals for the period
            $debitTotal = $entries->where('entry_type', AccountingEntry::ENTRY_TYPE_DEBIT)->sum('amount');
            $creditTotal = $entries->where('entry_type', AccountingEntry::ENTRY_TYPE_CREDIT)->sum('amount');

            // Calculate closing balance
            if (in_array($selectedAccount->account_type, ['asset', 'expense'])) {
                $closingBalance = $openingBalance + $debitTotal - $creditTotal;
            } else {
                $closingBalance = $openingBalance + $creditTotal - $debitTotal;
            }
        }

        return view('admin.general-ledger.index', compact(
            'accounts',
            'selectedAccount',
            'entries',
            'startDate',
            'endDate',
            'openingBalance',
            'debitTotal',
            'creditTotal',
            'closingBalance'
        ));
    }
}