<?php

ini_set('display_errors', 1);
ini_set('display_startup_errors', 1);

session_start();

if (empty($_SESSION['access_granted_kampfrichter']) || $_SESSION['access_granted_kampfrichter'] !== true || empty($_SESSION['user_id_kampfrichter']) || $_SESSION['user_id_kampfrichter'] < 1) {
	http_response_code(403);
	exit;
}

header('Content-Type: application/json');

if (!isset($baseDir)) {
    $baseDir = $_SERVER['DOCUMENT_ROOT'];
}

$type = 'kr';

$data = require $baseDir . '/../scripts/db/db-verbindung-script.php';

if ($data['success'] === false){
	echo json_encode(['success' => false, 'message' => $data['message']]);
    exit; 
}

require $baseDir . '/../scripts/db/db-functions.php';
require $baseDir . '/../scripts/db/db-tables.php';


$person_id  = isset($_POST['personId']) ? intval($_POST['personId']) : 0;
$field_type_id = intval($_POST['fieldTypeId'] ?? 0);
$gereat_id     = intval($_POST['gereatId'] ?? 0);
$jahr       = isset($_POST['jahr']) ? intval($_POST['jahr']) : 0;

if (!isset($_POST['value'])) {
    echo json_encode(['success' => false, 'message' => 'Kein Value angegeben']);
    exit;
}

$value = floatval($_POST['value']);

if ($person_id < 1) {
    echo json_encode(['success' => false, 'message' => 'Invalide Personen-ID']);
    exit;
}

if ($jahr < 1) {
    echo json_encode(['success' => false, 'message' => 'Invalides Jahr']);
    exit;
}

if ($gereat_id < 1) {
    echo json_encode(['success' => false, 'message' => 'Invalide Geraet-ID']);
    exit;
}

$geratExistiert = db_get_var($mysqli, "SELECT 1 FROM $tableNotenBezeichnungen WHERE id = ? LIMIT 1", [$gereat_id]);

if (!$geratExistiert) {
    echo json_encode(['success' => false, 'message' => 'Invalide Geraet-ID']);
    exit;
}

if ($field_type_id < 1) {
    echo json_encode(['success' => false, 'message' => 'Invalide Notentyp-ID']);
    exit;
}

$noteConfig = db_select($mysqli, $tableNotenBezeichnungen, "*", "id = ?", [$field_type_id]);

if (count($noteConfig) !== 1) {
    echo json_encode(['success' => false, 'message' => 'Invalide Notentyp-ID']);
    exit;
}

$singleNoteConfig = $noteConfig[0];

if ($singleNoteConfig['max_value'] !== null && $value > $singleNoteConfig['max_value']) {
    echo json_encode(['success' => false, 'message' => "Wert zu hoch (max " . $singleNoteConfig['max_value'].")"]);
    exit;
}

if ($singleNoteConfig['min_value'] !== null && $value < $singleNoteConfig['min_value']){
    echo json_encode(['success' => false, 'message' => "Wert zu niedrig (min " . $singleNoteConfig['min_value'].")"]);
    exit;
}

$sql = "INSERT INTO $tableNoten (`value`, `person_id`, `note_bezeichnung_id`, `geraet_id`, `jahr`) 
        VALUES (?, ?, ?, ?, ?) 
        ON DUPLICATE KEY UPDATE `value` = VALUES(`value`)";

$stmt = $mysqli->prepare($sql);

$stmt->bind_param("siiii", $value, $person_id, $field_type_id, $gereat_id, $jahr);

$stmt->execute();

$stmt->close();

if ($singleNoteConfig['berechnung_json'] === null) {
    echo json_encode(['success' => true, 'message' => "Wert aktualisiert"]);
    exit;
}

require $baseDir . "/../scripts/string-calculator/string-calculator-functions.php";

$updateNoten = [];

$notenRechner = new NotenRechner();

try {
    $abhaenigeRechnungen = json_decode($singleNoteConfig['berechnung_json']);
} catch (Exception $e) {
    echo json_encode(['success' => true, 'message' => "Wert aktualisiert, fehler bei der Berechnung der weiteren Werte"]);
    exit;
}

// Alle Werte werden von der Datenbank geholt und werden, wenn nicht vorhanden, durch den Standartwert ersetzt.

$alleNoten = db_select($mysqli, $tableNotenBezeichnungen, "id, berechnung, default_value, nullstellen");

$noten = db_select($mysqli, $tableNoten, "`value`, `note_bezeichnung_id`", "`person_id` = ? AND `geraet_id` = ? AND `jahr` = ?", [$person_id, $gereat_id, $jahr]);

$ascArrayDefaultValues = array_column($alleNoten, 'default_value', 'id');
$ascArrayRechnungen = array_column($alleNoten, 'berechnung', 'id');

$existierendeNotenIds = array_column($noten, 'note_bezeichnung_id') ?? [];

$alleNotenIds = array_column($alleNoten, 'id') ?? [];

$nichtExistierendeNotenIds = array_diff($alleNotenIds, $existierendeNotenIds) ?? [];

$noten = array_column($noten, 'value', 'note_bezeichnung_id');

foreach ($nichtExistierendeNotenIds as $neni) {
    if (!isset($ascArrayDefaultValues[$neni])) { continue; }
    $noten[$neni] = $ascArrayDefaultValues[$neni];
}

// We only want to save the IDs that were actually recalculated
$idsToSave = []; 

foreach ($abhaenigeRechnungen as $sRechnung) {
    $rechnung = $ascArrayRechnungen[$sRechnung] ?? null;
    
    if ($rechnung === null) {
        echo json_encode(['success' => true, 'message' => "Wert aktualisiert, Fehler: Rechnung $sRechnung nicht gefunden"]);
        exit;
    }

    $calcResult = $notenRechner->berechneString($rechnung, $noten);
    if ($calcResult['success'] !== true) {
        echo json_encode(['success' => true, 'message' => "Wert aktualisiert, Rechenfehler: " . ($calcResult['value'] ?? '')]);
        exit;
    }

    // Update the local array so the NEXT calculation in the loop can use this new value
    $noten[$sRechnung] = $calcResult['value'];
    
    // Track that this ID needs to be written to the database
    $idsToSave[] = $sRechnung;
}

// Prepare the statement once
$sql = "INSERT INTO $tableNoten (`value`, `person_id`, `note_bezeichnung_id`, `geraet_id`, `jahr`) 
        VALUES (?, ?, ?, ?, ?)
        ON DUPLICATE KEY UPDATE `value` = VALUES(`value`)";

$stmt = $mysqli->prepare($sql);

foreach ($idsToSave as $notenId) {
    $currentValue = $noten[$notenId]; // Get the calculated value from our array
    
    // i = integer, s = string (use 's' for decimals/floats to prevent rounding issues in PHP)
    $stmt->bind_param("siiii", $currentValue, $person_id, $notenId, $gereat_id, $jahr);
    $stmt->execute();
}

$stmt->close();
$mysqli->close();

// 1. Combine the ID the user sent with the IDs we recalculated
$changedIds = array_merge([$field_type_id], $idsToSave);

// 2. Filter the $noten array to only include these keys
// array_flip turns [10, 20] into [10 => 0, 20 => 1] so we can intersect by keys
$changedNoten = array_intersect_key($noten, array_flip($changedIds));

$indexedNullstellen = array_column($alleNoten, 'nullstellen', 'id');

foreach ($changedNoten as $key => $scN) {
    $changedNoten[$key] = number_format($scN ,$indexedNullstellen[$key] ?? 2);
}

echo json_encode([
    'success' => true, 
    'message' => "Wert aktualisiert, alle Berechnungen durchgeführt", 
    "noten"   => $changedNoten
]);