<?php
session_start();
require '../../../assets/utils/db_auth.php';
require '../../../assets/utils/classes_ac/PostingWindowGuard.php';
require '../../../assets/utils/classes_ac/GlManager.php';

$gl_id        = (int)($data['gl_id']        ?? 0);
$reference    = trim((string)($data['reference']    ?? ''));
$description  = trim((string)($data['description']  ?? ''));
$journal_date = trim((string)($data['journal_date'] ?? ''));
$lines_raw    = $data['lines'] ?? [];

if (is_string($lines_raw)) {
    $lines_raw = json_decode($lines_raw, true) ?: [];
}

// Convert d/m/Y → Y-m-d
if (preg_match('#^(\d{2})/(\d{2})/(\d{4})$#', $journal_date, $m)) {
    $journal_date = "{$m[3]}-{$m[2]}-{$m[1]}";
}

if (!$journal_date || !preg_match('/^\d{4}-\d{2}-\d{2}$/', $journal_date)) {
    $answer['message'] = 'Valid journal date is required.';
    exit(json_encode($answer));
}

$period    = substr($journal_date, 0, 7); // YYYY-MM

// Validate and normalise lines
$lines       = [];
$total_debit = 0;
$total_credit = 0;

foreach ($lines_raw as $l) {
    $account_code = trim((string)($l['account_code'] ?? ''));
    $debit        = (float)($l['debit']  ?? 0);
    $credit       = (float)($l['credit'] ?? 0);
    $desc         = trim((string)($l['description'] ?? ''));

    if ($account_code === '') continue;
    if ($debit == 0 && $credit == 0) continue;

    $lines[]      = ['account_code' => $account_code, 'department_id' => 0, 'debit' => $debit, 'credit' => $credit, 'description' => $desc];
    $total_debit  += $debit;
    $total_credit += $credit;
}

if (count($lines) < 2) {
    $answer['message'] = 'At least two journal lines are required.';
    exit(json_encode($answer));
}

if (abs($total_debit - $total_credit) > 0.005) {
    $answer['message'] = 'Journal is not balanced. Debit ' . number_format($total_debit, 2) . ' ≠ Credit ' . number_format($total_credit, 2) . '.';
    exit(json_encode($answer));
}

try {
    $pdo2->beginTransaction();
    $guard = new PostingWindowGuard($pdo1, $company_id);
    $gl = new GlManager($pdo2, $company_id, $guard);

    if ($gl_id > 0) {
        $gl->replaceManual($gl_id, $reference, $description, $journal_date, $period, $lines);
        $answer['message'] = 'Journal entry updated.';
    } else {
        $gl_id = $gl->postManual($reference, $description, $journal_date, $period, $lines);
        $answer['message'] = 'Journal entry saved.';
    }

    $pdo2->commit();
    $answer['success'] = 1;
    $answer['gl_id']   = $gl_id;
} catch (Exception $e) {
    if ($pdo2->inTransaction()) $pdo2->rollBack();
    $answer['message'] = $e->getMessage();
}

exit(json_encode($answer));