<?php
defined($security_key) or exit;
ini_set('display_errors', '1');
ini_set('display_startup_errors', '1');
error_reporting(E_ALL);
//------------------------------------------
// Products Software Upgrades API
//------------------------------------------

//Connect to DB
$pdo = dbConnect($dbname);

//NEW ARRAY
$criterias = [];
$clause = '';
$debug = [];

//Check for $_GET variables and build up clause
if(isset($get_content) && $get_content!=''){
    //GET VARIABLES FROM URL
    $requests = explode("&", $get_content);
    //Check for keys and values
    foreach ($requests as $y){
        $v = explode("=", $y);
        //INCLUDE VARIABLES IN ARRAY
        $criterias[$v[0]] = $v[1];
    }
}

if (debug) {
    $debug['request_parameters'] = $criterias;
    $debug['timestamp'] = date('Y-m-d H:i:s');
}

// IF SN IS PROVIDED, HANDLE UPGRADE OPTIONS
if (isset($criterias['sn']) && $criterias['sn'] != ''){

    //default output (array of options)
    $output = [];

    //check if current version is send and update the equipment record
    if(isset($criterias['version']) && $criterias['version'] !=''){
        $sql = 'UPDATE equipment SET sw_version = ?, updatedby = ? WHERE serialnumber = ? ';
        $stmt = $pdo->prepare($sql);
        $stmt->execute([$criterias['version'],$username,$criterias['sn']]);
    }

    //check if current hw_version is send and update the equipment record
    if(isset($criterias['hw_version']) && $criterias['hw_version'] !=''){
        // Translate hardware version to standardized format
        $translated_hw_version = translateDeviceHardwareVersion($criterias['hw_version']);
        $sql = 'UPDATE equipment SET hw_version = ?, updatedby = ? WHERE serialnumber = ? ';
        $stmt = $pdo->prepare($sql);
        $stmt->execute([$translated_hw_version,$username,$criterias['sn']]);
    }

    //GET EQUIPMENT AND PRODUCT DATA BASED ON SERIAL NUMBER
    $sql = 'SELECT
                p.rowID as product_rowid,
                p.productcode,
                e.sw_version as current_sw_version,
                e.hw_version,
                e.sw_version_license,
                e.rowID as equipment_rowid
            FROM equipment e
            JOIN products p ON e.productrowid = p.rowID
            WHERE e.serialnumber = ?';
    $stmt = $pdo->prepare($sql);
    $stmt->execute([$criterias['sn']]);
    $equipment_data = $stmt->fetch(PDO::FETCH_ASSOC);

    if (!$equipment_data) {
        $messages = ["error" => "No equipment found for serialnumber"];
    } else {
        $product_rowid = $equipment_data['product_rowid'];
        $productcode = $equipment_data['productcode'];
        $current_sw_version = $equipment_data['current_sw_version'];
        $hw_version = $equipment_data['hw_version'];
        $sw_version_license = $equipment_data['sw_version_license'];
        $equipment_rowid = $equipment_data['equipment_rowid'];

        if (debug) {
            $debug['equipment_data'] = [
                'product_rowid' => $product_rowid,
                'productcode' => $productcode,
                'current_sw_version_raw' => $current_sw_version,
                'hw_version' => $hw_version,
                'sw_version_license' => $sw_version_license
            ];
        }

        // Normalize software version for comparison (lowercase, trim leading zeros)
        $current_sw_version = strtolower(ltrim($current_sw_version, '0'));

        // Translate incoming hw_version parameter for comparison if provided
        $comparison_hw_version = $hw_version;
        $hw_version_from_request = null;
        if(isset($criterias['hw_version']) && $criterias['hw_version'] !=''){
            $hw_version_from_request = $criterias['hw_version'];
            $comparison_hw_version = translateDeviceHardwareVersion($criterias['hw_version']);
        }

        if (debug) {
            $debug['normalized_data'] = [
                'current_sw_version' => $current_sw_version,
                'hw_version_from_request' => $hw_version_from_request,
                'comparison_hw_version' => $comparison_hw_version,
                'hw_version_valid' => ($comparison_hw_version !== '')
            ];
        }

        // Check if hardware version is invalid (all zeros)
        if ($hw_version_from_request && $comparison_hw_version === '') {
            $messages = ["error" => "Invalid hardware version (000000) - device may not be properly initialized"];
            if (debug) {
                $messages['debug'] = $debug;
            }
            echo json_encode($messages, JSON_UNESCAPED_UNICODE);
            exit;
        }

        //GET ALL ACTIVE SOFTWARE ASSIGNMENTS for this product with matching HW version
        $sql = 'SELECT
                    psv.rowID as version_id,
                    psv.version,
                    psv.name,
                    psv.description,
                    psv.mandatory,
                    psv.latest,
                    psv.hw_version,
                    psv.file_path
                FROM products_software_assignment psa
                JOIN products_software_versions psv ON psa.software_version_id = psv.rowID
                WHERE psa.product_id = ?
                    AND psa.status = 1
                    AND (psv.hw_version = ? OR psv.hw_version IS NULL OR psv.hw_version = "")';

        $stmt = $pdo->prepare($sql);
        $stmt->execute([$product_rowid, $comparison_hw_version]);
        $versions = $stmt->fetchAll(PDO::FETCH_ASSOC);

        if (debug) {
            $debug['active_assignments'] = [
                'count' => count($versions),
                'versions' => array_map(function($v) {
                    return [
                        'version_id' => $v['version_id'],
                        'version' => $v['version'],
                        'name' => $v['name'],
                        'hw_version' => $v['hw_version'],
                        'latest' => $v['latest']
                    ];
                }, $versions)
            ];
        }

        if (empty($versions)) {
            $messages = ["error" => "No active software assignments found for product"];
            if (debug) {
                $messages['debug'] = $debug;
            }
        } else {
            // First check if current version has paid upgrade paths FROM it
            $has_paid_upgrade_from_current = false;
            if ($current_sw_version) {
                $sql = 'SELECT COUNT(*) as paid_count
                        FROM products_software_upgrade_paths pup
                        JOIN products_software_versions from_ver ON pup.from_version_id = from_ver.rowID
                        WHERE LOWER(TRIM(LEADING "0" FROM from_ver.version)) = ?
                            AND pup.price > 0
                            AND pup.is_active = 1';
                $stmt = $pdo->prepare($sql);
                $stmt->execute([$current_sw_version]);
                $paid_check = $stmt->fetch(PDO::FETCH_ASSOC);
                $has_paid_upgrade_from_current = ($paid_check['paid_count'] > 0);
            }

            if (debug) {
                $debug['has_paid_upgrade_from_current'] = $has_paid_upgrade_from_current;
                $debug['version_decisions'] = [];
            }

            foreach ($versions as $version) {
                //Normalize version for comparison (lowercase, trim leading zeros)
                $normalized_version = strtolower(ltrim($version['version'], '0'));

                $is_current_version = ($current_sw_version && $normalized_version == $current_sw_version);

                //All versions with matching HW are potential upgrades
                $show_version = false;
                $final_price = '0.00';
                $final_currency = '';
                $is_current = false;
                $decision_reason = '';

                if (debug) {
                    $version_debug = [
                        'version' => $version['version'],
                        'name' => $version['name'],
                        'normalized_version' => $normalized_version,
                        'is_current_version' => $is_current_version,
                        'latest' => $version['latest']
                    ];
                }

                if (!$current_sw_version || $current_sw_version == '') {
                    //No current version - show all as free upgrades
                    if (!$is_current_version) {
                        $show_version = true;
                        $decision_reason = 'No current version stored - showing as free upgrade';
                    } else {
                        $decision_reason = 'Skipped - is current version but no upgrades scenario';
                    }
                } else {
                    //Check if this is the current version and should be shown as disabled
                    if ($is_current_version && $has_paid_upgrade_from_current && $version['latest'] == 1) {
                        //Show current version as disabled only if it's the latest AND there's a paid upgrade available
                        $show_version = true;
                        $is_current = true;
                        $final_price = '0.00';
                        $final_currency = '';
                        $decision_reason = 'Showing as CURRENT - is latest version with paid upgrade available';
                    } else if ($is_current_version && !($has_paid_upgrade_from_current && $version['latest'] == 1)) {
                        $decision_reason = 'Skipped - is current version but not (latest + has_paid_upgrade)';
                    } else if (!$is_current_version) {
                        //Check if this version is part of ANY upgrade path system (either FROM or TO)
                        $sql = 'SELECT COUNT(*) as path_count
                                FROM products_software_upgrade_paths
                                WHERE (to_version_id = ? OR from_version_id = ?) AND is_active = 1';
                        $stmt = $pdo->prepare($sql);
                        $stmt->execute([$version['version_id'], $version['version_id']]);
                        $path_check = $stmt->fetch(PDO::FETCH_ASSOC);

                        if (debug) {
                            $version_debug['upgrade_path_count'] = $path_check['path_count'];
                        }

                        if ($path_check['path_count'] == 0) {
                            //Not part of any upgrade path system - show as free upgrade
                            $show_version = true;
                            $decision_reason = 'Showing as FREE - no upgrade paths defined for this version';
                        } else {
                            //Part of an upgrade path system
                            //Only show if there's an explicit path FROM current version TO this version
                            $sql = 'SELECT pup.price, pup.currency
                                    FROM products_software_upgrade_paths pup
                                    JOIN products_software_versions from_ver ON pup.from_version_id = from_ver.rowID
                                    WHERE pup.to_version_id = ?
                                        AND LOWER(TRIM(LEADING "0" FROM from_ver.version)) = ?
                                        AND pup.is_active = 1';
                            $stmt = $pdo->prepare($sql);
                            $stmt->execute([$version['version_id'], $current_sw_version]);
                            $upgrade_path = $stmt->fetch(PDO::FETCH_ASSOC);

                            if ($upgrade_path) {
                                //Valid upgrade path found FROM current version
                                $show_version = true;
                                $final_price = $upgrade_path['price'] ?? '0.00';
                                $final_currency = $upgrade_path['currency'] ?? '';
                                $decision_reason = 'Showing - found upgrade path FROM current (' . $current_sw_version . ') with price: ' . $final_price . ' ' . $final_currency;
                            } else {
                                $decision_reason = 'Skipped - has upgrade paths but none FROM current version (' . $current_sw_version . ')';
                            }
                            //If no path from current version exists, don't show (show_version stays false)
                        }
                    }
                }

                if (debug) {
                    $version_debug['decision'] = [
                        'show_version' => $show_version,
                        'is_current' => $is_current,
                        'final_price' => $final_price,
                        'final_currency' => $final_currency,
                        'reason' => $decision_reason
                    ];
                }

                if ($show_version) {
                    //Check if there's a valid license for this upgrade
                    $license_applied = false;
                    if ($final_price > 0 && $sw_version_license) {
                        //Check if the license is valid
                        $sql = 'SELECT status, starts_at, expires_at
                                FROM products_software_licenses
                                WHERE license_key = ?';
                        $stmt = $pdo->prepare($sql);
                        $stmt->execute([$sw_version_license]);
                        $license = $stmt->fetch(PDO::FETCH_ASSOC);

                        if ($license && $license['status'] == 1) {
                            $now = date('Y-m-d H:i:s');
                            $start_at = $license['starts_at'];
                            $expires_at = $license['expires_at'];

                            //Check if license is within valid date range
                            if ((!$start_at || $start_at <= $now) && (!$expires_at || $expires_at >= $now)) {
                                $original_price = $final_price;
                                $final_price = '0.00';
                                $license_applied = true;

                                if (debug) {
                                    $version_debug['license_applied'] = [
                                        'license_key' => $sw_version_license,
                                        'original_price' => $original_price,
                                        'new_price' => $final_price
                                    ];
                                }
                            }
                        }
                    }

                    $output[] = [
                        "productcode" => $productcode,
                        "name" => $version['name'] ?? '',
                        "version" => $version['version'],
                        "version_id" => $version['version_id'],
                        "description" => $version['description'] ?? '',
                        "hw_version" => $version['hw_version'] ?? '',
                        "mandatory" => $version['mandatory'] ?? '',
                        "latest" => $version['latest'] ?? '',
                        "software" => $version['file_path'] ?? '',
                        "source" => '',
                        "source_type" => '',
                        "price" => $final_price,
                        "currency" => $final_currency,
                        "is_current" => $is_current
                    ];
                }

                if (debug) {
                    $debug['version_decisions'][] = $version_debug;
                }
            }

            //GENERATE DOWNLOAD TOKENS FOR EACH OPTION
            foreach ($output as &$option) {
                // Generate time-based download token
                $download_token = create_download_url_token($criterias['sn'], $option['version_id']);

                // Create secure download URL
                $download_url = 'https://'.$_SERVER['SERVER_NAME'].'/api.php/v2/software_download?token='.$download_token;

                // Set source as download URL
                $option['source'] = $download_url;
                $option['source_type'] = 'token_url';
            }

            if (debug) {
                $debug['final_output'] = [
                    'total_versions_shown' => count($output),
                    'versions' => array_map(function($o) {
                        return [
                            'name' => $o['name'],
                            'version' => $o['version'],
                            'price' => $o['price'],
                            'is_current' => $o['is_current']
                        ];
                    }, $output)
                ];
            }

            $messages = $output;

            if (debug && !empty($output)) {
                // Add debug as separate field in response
                foreach ($messages as &$msg) {
                    $msg['_debug'] = $debug;
                    break; // Only add to first item
                }
            } elseif (debug && empty($output)) {
                $messages = ['message' => 'No upgrades available', 'debug' => $debug];
            }
        }
    }
}
else {
    $messages = ["error" => "No serialnumber found"];
}
//Encrypt results
$messages = json_encode($messages, JSON_UNESCAPED_UNICODE);

//Send results
echo $messages;

?>