<?php
header('Content-Type: application/json; charset=utf-8');

require_once(__DIR__ . '/include/headscript.php');

function jsonResponse(array $data): void
{
    echo json_encode($data);
    exit;
}

function updateJobProcessing(PDO $pdo, int $id): void
{
    $stmt = $pdo->prepare("
        UPDATE cad_area_jobs
        SET
            status = 'processing',
            message = 'Elaborazione in corso...',
            updated_at = NOW()
        WHERE id = ?
    ");

    $stmt->execute([$id]);
}

function updateJobError(PDO $pdo, int $id, string $message, ?array $pythonResponse = null): void
{
    $stmt = $pdo->prepare("
        UPDATE cad_area_jobs
        SET
            status = 'error',
            message = ?,
            python_response = ?,
            updated_at = NOW()
        WHERE id = ?
    ");

    $stmt->execute([
        $message,
        $pythonResponse ? json_encode($pythonResponse) : null,
        $id
    ]);
}

function updateJobCompleted(PDO $pdo, int $id, array $response): void
{
    $stmt = $pdo->prepare("
        UPDATE cad_area_jobs
        SET
            status = 'completed',
            message = ?,
            area_mm2 = ?,
            area_cm2 = ?,
            area_m2 = ?,
            width_mm = ?,
            height_mm = ?,
            scale_detected = ?,
            scale_used = ?,
            confidence = ?,
            python_response = ?,
            updated_at = NOW()
        WHERE id = ?
    ");

    $stmt->execute([
        $response['message'] ?? 'Area calcolata correttamente.',
        $response['area_mm2'] ?? null,
        $response['area_cm2'] ?? null,
        $response['area_m2'] ?? null,
        $response['width_mm'] ?? null,
        $response['height_mm'] ?? null,
        $response['scale_detected'] ?? null,
        $response['scale_used'] ?? null,
        $response['confidence'] ?? null,
        json_encode($response),
        $id
    ]);
}

function normalizeCalculationMode(?string $mode): string
{
    $allowed = [
        'auto_roi',
        'stitch_contour',
        'filled_union',
        'closed_path'
    ];

    if (!$mode || !in_array($mode, $allowed, true)) {
        return 'auto_roi';
    }

    return $mode;
}

function hasValidRoi(array $job): bool
{
    return (
        array_key_exists('roi_x', $job) &&
        array_key_exists('roi_y', $job) &&
        array_key_exists('roi_width', $job) &&
        array_key_exists('roi_height', $job) &&
        $job['roi_x'] !== null &&
        $job['roi_y'] !== null &&
        $job['roi_width'] !== null &&
        $job['roi_height'] !== null &&
        (float)$job['roi_width'] > 0 &&
        (float)$job['roi_height'] > 0
    );
}

function callPythonAreaService(string $url, array $job): array
{
    $filePath = $job['file_path'] ?? '';
    $originalFilename = $job['original_filename'] ?? basename($filePath);

    if (!$filePath || !file_exists($filePath)) {
        return [
            'success' => false,
            'message' => 'File PDF non trovato sul server: ' . $filePath
        ];
    }

    $mode = normalizeCalculationMode($job['calculation_mode'] ?? 'auto_roi');

    $scaleRatio = $job['scale_used'] ?? null;

    if ($scaleRatio === null || $scaleRatio === '' || (float)$scaleRatio <= 0) {
        $scaleRatio = '1';
    }

    $curlFile = new CURLFile(
        $filePath,
        'application/pdf',
        $originalFilename
    );

    $postFields = [
        'file' => $curlFile,
        'mode' => $mode,
        'scale_ratio' => (string)$scaleRatio,
        'roi_x' => (string)$job['roi_x'],
        'roi_y' => (string)$job['roi_y'],
        'roi_width' => (string)$job['roi_width'],
        'roi_height' => (string)$job['roi_height'],
        'roi_page' => (string)($job['roi_page'] ?? 1)
    ];

    $ch = curl_init();

    curl_setopt_array($ch, [
        CURLOPT_URL => $url,
        CURLOPT_POST => true,
        CURLOPT_POSTFIELDS => $postFields,
        CURLOPT_RETURNTRANSFER => true,
        CURLOPT_TIMEOUT => 180,
        CURLOPT_CONNECTTIMEOUT => 10,
        CURLOPT_HTTPHEADER => [
            'Accept: application/json'
        ]
    ]);

    $rawResponse = curl_exec($ch);
    $curlError = curl_error($ch);
    $httpCode = (int)curl_getinfo($ch, CURLINFO_HTTP_CODE);

    curl_close($ch);

    if ($rawResponse === false) {
        return [
            'success' => false,
            'message' => 'Errore cURL verso Python: ' . $curlError
        ];
    }

    $decoded = json_decode($rawResponse, true);

    if (!is_array($decoded)) {
        return [
            'success' => false,
            'message' => 'Risposta Python non JSON valida.',
            'http_code' => $httpCode,
            'raw_response' => $rawResponse
        ];
    }

    if ($httpCode < 200 || $httpCode >= 300) {
        return [
            'success' => false,
            'message' => $decoded['message'] ?? ('Servizio Python HTTP ' . $httpCode),
            'http_code' => $httpCode,
            'python_response' => $decoded,
            'raw_response' => $rawResponse
        ];
    }

    return $decoded;
}

try {
    $db = DBHandlerSelect::getInstance();
    $pdo = $db->getConnection();

    $iduser = $iduserlogin ?? null;

    $input = json_decode(file_get_contents('php://input'), true);

    if (!is_array($input)) {
        jsonResponse([
            'success' => false,
            'message' => 'Payload JSON non valido.'
        ]);
    }

    $ids = $input['ids'] ?? [];

    if (!is_array($ids) || count($ids) === 0) {
        jsonResponse([
            'success' => false,
            'message' => 'Nessun ID ricevuto.'
        ]);
    }

    $ids = array_values(array_unique(array_map('intval', $ids)));
    $ids = array_filter($ids, fn($id) => $id > 0);

    if (count($ids) === 0) {
        jsonResponse([
            'success' => false,
            'message' => 'Nessun ID valido ricevuto.'
        ]);
    }

    $pythonServiceUrl = 'http://127.0.0.1:5055/calculate';

    $results = [];

    foreach ($ids as $id) {
        if ($iduser === null || $iduser === '') {
            $stmt = $pdo->prepare("
                SELECT *
                FROM cad_area_jobs
                WHERE id = ?
                LIMIT 1
            ");

            $stmt->execute([$id]);
        } else {
            $stmt = $pdo->prepare("
                SELECT *
                FROM cad_area_jobs
                WHERE id = ?
                AND iduser = ?
                LIMIT 1
            ");

            $stmt->execute([$id, $iduser]);
        }

        $job = $stmt->fetch(PDO::FETCH_ASSOC);

        if (!$job) {
            $results[] = [
                'id' => $id,
                'success' => false,
                'message' => 'Record non trovato.'
            ];

            continue;
        }

        if (!hasValidRoi($job)) {
            $message = 'Prima devi definire la sezione da misurare tramite il pulsante Sezione.';

            updateJobError($pdo, $id, $message, [
                'success' => false,
                'message' => $message,
                'job_roi_debug' => [
                    'roi_x' => $job['roi_x'] ?? null,
                    'roi_y' => $job['roi_y'] ?? null,
                    'roi_width' => $job['roi_width'] ?? null,
                    'roi_height' => $job['roi_height'] ?? null,
                    'roi_page' => $job['roi_page'] ?? null,
                    'calculation_mode' => $job['calculation_mode'] ?? null
                ]
            ]);

            $results[] = [
                'id' => $id,
                'success' => false,
                'message' => $message
            ];

            continue;
        }

        updateJobProcessing($pdo, $id);

        $pythonResponse = callPythonAreaService($pythonServiceUrl, $job);

        if (!($pythonResponse['success'] ?? false)) {
            $message = $pythonResponse['message'] ?? 'Errore durante il calcolo Python.';

            updateJobError($pdo, $id, $message, $pythonResponse);

            $results[] = [
                'id' => $id,
                'success' => false,
                'message' => $message,
                'python_response' => $pythonResponse
            ];

            continue;
        }

        updateJobCompleted($pdo, $id, $pythonResponse);

        $results[] = [
            'id' => $id,
            'success' => true,
            'message' => $pythonResponse['message'] ?? 'Area calcolata.',
            'area_mm2' => $pythonResponse['area_mm2'] ?? null,
            'area_cm2' => $pythonResponse['area_cm2'] ?? null
        ];
    }

    jsonResponse([
        'success' => true,
        'results' => $results
    ]);
} catch (Throwable $e) {
    error_log('CAD area process error: ' . $e->getMessage());

    jsonResponse([
        'success' => false,
        'message' => $e->getMessage()
    ]);
}