<?php

namespace Modules\Accounting\Services;

use Carbon\Carbon;
use Illuminate\Support\Facades\DB;
use Modules\Accounting\Domain\FinancialPostingRequest;
use Modules\Accounting\Entities\AccountingAccount;
use Modules\Accounting\Entities\AccountingFiscalPeriod;
use Modules\Accounting\Utils\AccountingUtil;

class PeriodCloseService
{
    public function __construct(
        protected FinancialPostingService $postingService,
        protected AccountingUtil $accountingUtil
    ) {}

    public function isDateLocked(int $businessId, string $date): bool
    {
        return AccountingFiscalPeriod::where('business_id', $businessId)
            ->where('is_closed', true)
            ->whereDate('start_date', '<=', $date)
            ->whereDate('end_date', '>=', $date)
            ->exists();
    }

    public function createPeriod(int $businessId, string $name, string $startDate, string $endDate): AccountingFiscalPeriod
    {
        return AccountingFiscalPeriod::create([
            'business_id' => $businessId,
            'name' => $name,
            'start_date' => $startDate,
            'end_date' => $endDate,
            'is_closed' => false,
        ]);
    }

    public function closePeriod(int $businessId, int $periodId, int $userId, ?int $retainedEarningsAccountId = null): AccountingFiscalPeriod
    {
        $period = AccountingFiscalPeriod::where('business_id', $businessId)->findOrFail($periodId);

        if ($period->is_closed) {
            throw new \RuntimeException('Period already closed.');
        }

        $balanceFormula = $this->accountingUtil->balanceFormula();
        $incomeExpense = AccountingAccount::join('accounting_accounts_transactions as AAT', 'AAT.accounting_account_id', '=', 'accounting_accounts.id')
            ->where('accounting_accounts.business_id', $businessId)
            ->whereIn('accounting_accounts.account_primary_type', ['income', 'expense', 'expenses'])
            ->whereDate('AAT.operation_date', '>=', $period->start_date)
            ->whereDate('AAT.operation_date', '<=', $period->end_date)
            ->select(
                'accounting_accounts.id',
                'accounting_accounts.account_primary_type',
                DB::raw($balanceFormula)
            )
            ->groupBy('accounting_accounts.id', 'accounting_accounts.account_primary_type')
            ->get();

        $lines = [];
        $netIncome = 0.0;

        foreach ($incomeExpense as $row) {
            $balance = (float) $row->balance;
            if (abs($balance) < 0.01) {
                continue;
            }

            if ($row->account_primary_type === 'income') {
                $netIncome += $balance;
                $lines[] = [
                    'accounting_account_id' => $row->id,
                    'amount' => abs($balance),
                    'type' => $balance > 0 ? 'debit' : 'credit',
                ];
            } elseif (in_array($row->account_primary_type, ['expense', 'expenses'], true)) {
                $netIncome -= $balance;
                $lines[] = [
                    'accounting_account_id' => $row->id,
                    'amount' => abs($balance),
                    'type' => $balance > 0 ? 'credit' : 'debit',
                ];
            }
        }

        if ($retainedEarningsAccountId && abs($netIncome) >= 0.01) {
            $lines[] = [
                'accounting_account_id' => $retainedEarningsAccountId,
                'amount' => abs($netIncome),
                'type' => $netIncome >= 0 ? 'credit' : 'debit',
            ];
        }

        if (! empty($lines)) {
            $mapping = $this->postingService->post(new FinancialPostingRequest(
                businessId: $businessId,
                userId: $userId,
                sourceType: 'period_close',
                sourceId: $period->id,
                note: 'Period close: '.$period->name,
                lines: $lines,
                operationDate: Carbon::parse($period->end_date)->endOfDay()->toDateTimeString(),
                mappingType: 'journal_entry',
            ));

            $period->closing_journal_mapping_id = $mapping?->id;
        }

        $period->is_closed = true;
        $period->closed_at = now();
        $period->closed_by = $userId;
        $period->save();

        return $period;
    }

    public function closeAndRollForward(
        int $businessId,
        int $periodId,
        int $userId,
        ?int $retainedEarningsAccountId = null,
        bool $createNextPeriod = false
    ): AccountingFiscalPeriod {
        $period = $this->closePeriod($businessId, $periodId, $userId, $retainedEarningsAccountId);

        if ($createNextPeriod) {
            $start = Carbon::parse($period->end_date)->addDay();
            $end = $start->copy()->addYear()->subDay();
            $this->createPeriod(
                $businessId,
                (string) $start->year.' - '.($start->year + 1),
                $start->toDateString(),
                $end->toDateString()
            );
        }

        return $period;
    }
}