<?php
// Sopprime eventuali output di errori (li logghiamo invece di mostrarli)
ob_start();
ini_set('display_errors', 0);
error_reporting(E_ALL);

// Inizia la sessione
session_start();

// Includi PHPSpreadsheet e la classe DBHandler
require_once '../../vendor/autoload.php';
require_once __DIR__ . '/class/db-functions.php';

function findHeaderRow(\PhpOffice\PhpSpreadsheet\Worksheet\Worksheet $worksheet, array $expectedHeaders, int $startCol, int $highestColIndex, int $maxRowsToScan = 20): ?int
{
    $normalizedExpected = array_filter(array_map(function ($h) {
        return strtolower(trim(str_replace(['\\r\\n', '\r\n', "\r\n", "\n", "\r"], ' ', $h)));
    }, $expectedHeaders));
    $normalizedExpected = array_values($normalizedExpected);
    sort($normalizedExpected);

    for ($row = 1; $row <= $maxRowsToScan; $row++) {
        $rowHeaders = [];
        for ($col = $startCol; $col <= $highestColIndex; $col++) {
            $colLetter = \PhpOffice\PhpSpreadsheet\Cell\Coordinate::stringFromColumnIndex($col);
            $cell = $worksheet->getCell($colLetter . $row);
            $val = $cell ? trim((string)$cell->getCalculatedValue()) : '';
            if ($val !== '') {
                $rowHeaders[] = strtolower(trim(str_replace(["\r\n", "\n", "\r"], ' ', $val)));
            }
        }
        $normalizedRow = $rowHeaders;
        sort($normalizedRow);

        $matches = count(array_intersect($normalizedExpected, $normalizedRow));
        $threshold = (int) ceil(count($normalizedExpected) * 0.6);
        if ($matches >= $threshold) {
            return $row;
        }
    }
    return null;
}

$response = ['error' => '', 'rows' => [], 'columns' => [], 'template_id' => 0, 'filename' => '', 'apply_routine' => false];

try {
    if ($_SERVER['REQUEST_METHOD'] === 'POST' && isset($_FILES['excel_file'])) {
        $template_id = isset($_POST['template_id']) ? intval($_POST['template_id']) : 0;
        $header_row = isset($_POST['header_row']) ? intval($_POST['header_row']) : 1;
        $start_column = isset($_POST['start_column']) ? intval($_POST['start_column']) : 1;

        // Debug del template_id ricevuto
        error_log("Received template_id from POST: " . print_r($_POST['template_id'], true));
        error_log("Converted template_id: $template_id");

        $file = $_FILES['excel_file'];
        $fileError = $file['error'];

        if ($fileError === UPLOAD_ERR_OK) {
            // Recupera l'ID dell'utente loggato
            if (!isset($iduserlogin)) {
                $iduserlogin = 1;
                error_log("Warning: iduserlogin non definito, usando 1 come default");
            }

            // Genera il nome del file rinominato
            $timestamp = date('YmdHis');
            $originalFilename = basename($file['name']);
            $newFilename = "{$iduserlogin}-{$timestamp}-{$originalFilename}";
            $importFolder = __DIR__ . '/imported_trf/';
            if (!file_exists($importFolder)) {
                mkdir($importFolder, 0777, true);
            }
            $destination = $importFolder . $newFilename;

            // Sposta il file
            if (!move_uploaded_file($file['tmp_name'], $destination)) {
                throw new Exception("Errore durante lo spostamento del file in $destination");
            }
            error_log("File spostato con successo in: $destination");

            // Connessione al database
            $db = DBHandlerSelect::getInstance();
            $pdo = $db->getConnection();

            // Recupera il mapping da template_mapping
            $stmt = $pdo->prepare("SELECT field_id AS excel_column, field_id AS mysql_column, data_type, is_required, default_value, is_manual FROM template_mapping WHERE template_id = ?");
            $stmt->execute([$template_id]);
            $mappings = $stmt->fetchAll(PDO::FETCH_ASSOC);

            // Debug dei mapping
            error_log("Mappings found for template_id $template_id: " . print_r($mappings, true));

            if (empty($mappings)) {
                $response['error'] = "Nessun mapping trovato per il template con ID $template_id";
            } else {
                // Carica il file rinominato con PHPSpreadsheet
                $spreadsheet = \PhpOffice\PhpSpreadsheet\IOFactory::load($destination);
                $worksheet = $spreadsheet->getActiveSheet();
                $highestRow = $worksheet->getHighestRow();
                $highestColumn = $worksheet->getHighestColumn();
                $highestColumnIndex = \PhpOffice\PhpSpreadsheet\Cell\Coordinate::columnIndexFromString($highestColumn);

                $startColumn = max(1, $start_column);

                // Recupera routine e headers dal template — DEVE essere prima dell'auto-detect
                $stmt = $pdo->prepare("SELECT idroutine, idclient, xls_headers FROM excel_templates WHERE id = ?");
                $stmt->execute([$template_id]);
                $template = $stmt->fetch(PDO::FETCH_ASSOC);
                error_log("=== DEBUG TEMPLATE ===");
                error_log("template raw: " . print_r($template, true));
                error_log("xls_headers value: " . var_export($template['xls_headers'] ?? 'KEY NON ESISTE', true));
                error_log("xls_headers empty check: " . var_export(empty($template['xls_headers']), true));
                // Auto-detect della riga header se xls_headers è disponibile
                $detectedHeaderRow = $header_row;
                if (!empty($template['xls_headers'])) {
                    $expectedHeaders = json_decode($template['xls_headers'], true);
                    if (is_array($expectedHeaders) && !empty($expectedHeaders)) {
                        error_log("Expected headers from DB: " . print_r($expectedHeaders, true));
                        $found = findHeaderRow($worksheet, $expectedHeaders, $startColumn, $highestColumnIndex);
                        error_log("findHeaderRow result: " . var_export($found, true));
                        if ($found !== null) {
                            $detectedHeaderRow = $found;
                            error_log("Header row auto-detected at row: $detectedHeaderRow (was: $header_row)");
                        } else {
                            error_log("Header row auto-detection failed, using provided header_row: $header_row");
                        }
                    }
                }
                $startRow = max(1, $detectedHeaderRow);
                $header_row = $detectedHeaderRow;

                // Debug dei parametri
                error_log("Processing - template_id: $template_id, startRow: $startRow, startColumn: $startColumn, highestRow: $highestRow, highestColumn: $highestColumn, highestColumnIndex: $highestColumnIndex");

                // Validazione degli indici
                if ($startRow > $highestRow) {
                    $response['error'] = "La riga di partenza ($startRow) supera il numero totale di righe ($highestRow).";
                } elseif ($startColumn > $highestColumnIndex) {
                    $response['error'] = "La colonna di partenza ($startColumn) supera il numero totale di colonne ($highestColumnIndex).";
                } else {
                    $excelData = [];
                    // Estrai la riga degli header
                    $headerRowData = [];
                    for ($col = $startColumn; $col <= $highestColumnIndex; $col++) {
                        $columnLetter = \PhpOffice\PhpSpreadsheet\Cell\Coordinate::stringFromColumnIndex($col);
                        $cell = $worksheet->getCell($columnLetter . $header_row);
                        $cellValue = $cell ? $cell->getCalculatedValue() : '';
                        $headerRowData[] = htmlspecialchars($cellValue ?: '');
                    }

                    // Estrai i dati a partire dalla riga successiva, includendo excelrow
                    for ($row = $header_row + 1; $row <= $highestRow; $row++) {
                        $rowData = [];
                        for ($col = $startColumn; $col <= $highestColumnIndex; $col++) {
                            $columnLetter = \PhpOffice\PhpSpreadsheet\Cell\Coordinate::stringFromColumnIndex($col);
                            $cell = $worksheet->getCell($columnLetter . $row);
                            $cellValue = $cell ? $cell->getCalculatedValue() : '';
                            $rowData[] = htmlspecialchars($cellValue ?: '');
                        }
                        if (!empty(array_filter($rowData))) {
                            $excelData[] = ['data' => $rowData, 'excelrow' => $row];
                        }
                    }


                    if ($template && $template['idroutine']) {
                        $stmtRoutine = $pdo->prepare("SELECT idroutine, name, filename, headerrow, instruction FROM routine WHERE idroutine = ?");
                        $stmtRoutine->execute([$template['idroutine']]);
                        $routineData = $stmtRoutine->fetch(PDO::FETCH_ASSOC);

                        if ($routineData) {
                            $response['apply_routine'] = true;
                            $response['routine_data'] = [
                                'name' => $routineData['name'] ?? 'Routine Sconosciuta',
                                'instruction' => $routineData['instruction'] ?? 'Nessuna descrizione disponibile',
                                'filename' => $routineData['filename'] ?? '',
                                'headerrow' => $routineData['headerrow'] ?? $header_row
                            ];
                            error_log("Routine rilevata per template {$template_id}: " . print_r($routineData, true));
                        } else {
                            error_log("Errore: Nessuna routine trovata per idroutine {$template['idroutine']}");
                        }
                    } else {
                        error_log("Nessuna routine associata al template {$template_id}");
                    }

                    // Aggiungi idclient alla risposta
                    $response['idclient'] = $template['idclient'] ?? null;

                    // Salva i dati in sessione
                    $_SESSION['excel_data'] = $excelData;
                    $_SESSION['template_id'] = $template_id;
                    $_SESSION['headers'] = $headerRowData;
                    $_SESSION['mappings'] = $mappings;

                    // Includi excel_data nella risposta JSON in ogni caso
                    $response['excel_data'] = $excelData;
                    $response['rows'] = array_column($excelData, 'data');
                    $response['columns'] = $headerRowData;
                    $response['template_id'] = $template_id;
                    $response['filename'] = $newFilename;
                }
            }
        } else {
            $response['error'] = "Errore nell'upload del file: Codice errore $fileError.";
        }
    } else {
        $response['error'] = "Richiesta non valida.";
    }
} catch (Exception $e) {
    $response['error'] = "Errore durante il caricamento del file: " . $e->getMessage();
    error_log("Exception in process_import_xls2.php: " . $e->getMessage());
}

// Pulisce qualsiasi output indesiderato
ob_end_clean();

// Invia la risposta JSON
header('Content-Type: application/json');
echo json_encode($response);
exit;