<?php
declare(strict_types=1);

require_once __DIR__ . '/../../modules/shared/db.php';
require_once __DIR__ . '/../../modules/shared/auth/service.php';
require_once __DIR__ . '/../../modules/erp/kontakte/service.php';
require_once __DIR__ . '/../../modules/market_management/service.php';

header('Content-Type: application/json; charset=utf-8');
header('Cache-Control: no-store');

$env = expand_env_values(parse_env_file(__DIR__ . '/../../.env'));
$pdo = connect_database($env);
auth_bootstrap_session();

if (auth_current_user($pdo) === null) {
    http_response_code(401);
    echo json_encode(['ok' => false, 'error' => 'Unauthorized']);
    exit;
}

$requestMethod = strtoupper((string) ($_SERVER['REQUEST_METHOD'] ?? 'GET'));
if ($requestMethod === 'POST') {
    $csrf = (string) ($_SERVER['HTTP_X_CSRF_TOKEN'] ?? '');
    if (!auth_validate_csrf_token($csrf)) {
        http_response_code(419);
        echo json_encode(['ok' => false, 'error' => 'Ungültiges Sicherheits-Token']);
        exit;
    }
    $payload = json_decode((string) file_get_contents('php://input'), true);
    if (!is_array($payload)) {
        http_response_code(400);
        echo json_encode(['ok' => false, 'error' => 'Ungültige Anfrage']);
        exit;
    }
    try {
        if (($payload['action'] ?? '') === 'create') {
            $fields = is_array($payload['fields'] ?? null) ? $payload['fields'] : [];
            $occurrence = market_management_create_occurrence($pdo, [
                'market_definition_id' => $fields['market_definition_id'] ?? null,
                'days' => [['date' => $fields['date'] ?? null]],
            ]);
            echo json_encode(['ok' => true, 'occurrence_id' => (int) $occurrence['id']], JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES);
            exit;
        }
    $scope = (string) ($payload['scope'] ?? '');
    $id = market_management_require_positive_id($payload['id'] ?? null, 'id');
    $fields = is_array($payload['fields'] ?? null) ? $payload['fields'] : [];
    $costTransactionStarted = false;
        if (($payload['action'] ?? '') === 'delete') {
            if (($payload['confirmation'] ?? '') !== 'DELETE') {
                throw new InvalidArgumentException('Die Löschbestätigung muss exakt DELETE lauten.');
            }
            market_management_set_occurrence_archive($pdo, $id, true);
        } elseif (($payload['action'] ?? '') === 'create_day') {
            $fields['occurrence_id'] = $id;
            $day = market_management_create_day($pdo, $fields);
            echo json_encode(['ok' => true, 'day' => $day]);
            exit;
        } elseif (($payload['action'] ?? '') === 'delete_day') {
            if (($payload['confirmation'] ?? '') !== 'DELETE') {
                throw new InvalidArgumentException('Bestätigung muss exakt DELETE lauten.');
            }
            $day = market_management_delete_day($pdo, $id);
            echo json_encode(['ok' => true, 'day' => $day]);
            exit;
        } elseif (($payload['action'] ?? '') === 'create_cost_item') {
            $fields['occurrence_id'] = $id;
            $costItem = market_management_create_cost_item($pdo, $fields);
            echo json_encode(['ok' => true, 'cost_item' => $costItem], JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES);
            exit;
        } elseif (($payload['action'] ?? '') === 'update_cost_item') {
            $costItem = market_management_update_cost_item($pdo, $id, $fields);
            echo json_encode(['ok' => true, 'cost_item' => $costItem], JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES);
            exit;
        } elseif (($payload['action'] ?? '') === 'delete_cost_item') {
            if (($payload['confirmation'] ?? '') !== 'DELETE') {
                throw new InvalidArgumentException('Bestätigung muss exakt DELETE lauten.');
            }
            $costItem = market_management_delete_cost_item($pdo, $id);
            echo json_encode(['ok' => true, 'cost_item' => $costItem], JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES);
            exit;
        } elseif ($scope === 'day') {
            market_management_update_day($pdo, $id, $fields);
        } elseif (in_array($scope, ['occurrence', 'status', 'overview', 'participation', 'infrastructure', 'travel', 'notes'], true)) {
        $contactFields = [];
        foreach (['contact_person_name', 'contact_email', 'contact_phone'] as $contactField) {
            if (array_key_exists($contactField, $fields)) {
                $contactFields[$contactField] = $fields[$contactField];
                unset($fields[$contactField]);
            }
        }
        $existingOccurrence = null;
        if ($contactFields !== []) {
            $existingOccurrence = market_management_get_occurrence($pdo, $id, true);
        }
        if ($contactFields !== []) {
            $contactFields['occurrence_id'] = $id;
            market_management_set_occurrence_contact($pdo, $contactFields);
        }
        if ($fields !== []) {
            $costItems = null;
            if (array_key_exists('cost_items', $fields)) {
                $costItems = is_string($fields['cost_items']) ? json_decode($fields['cost_items'], true) : $fields['cost_items'];
                if (!is_array($costItems)) {
                    throw new InvalidArgumentException('Kostenpositionen sind ungültig.');
                }
                if (!$pdo->inTransaction()) {
                    $pdo->beginTransaction();
                    $costTransactionStarted = true;
                }
                unset($fields['cost_items']);
                $keptCostItemIds = array_values(array_filter(array_map(
                    static fn (array $costItem): ?int => isset($costItem['id']) ? (int) $costItem['id'] : null,
                    array_filter($costItems, 'is_array')
                )));
                $existingCostItems = $pdo->prepare('SELECT id FROM market_occurrence_cost_item WHERE occurrence_id = :occurrence_id ORDER BY id ASC');
                $existingCostItems->execute([':occurrence_id' => $id]);
                foreach ($existingCostItems->fetchAll(PDO::FETCH_COLUMN) as $existingCostItemId) {
                    if (!in_array((int) $existingCostItemId, $keptCostItemIds, true)) {
                        market_management_delete_cost_item($pdo, (int) $existingCostItemId);
                    }
                }
                foreach ($costItems as $costItem) {
                    if (!is_array($costItem)) {
                        throw new InvalidArgumentException('Kostenposition ist ungültig.');
                    }
                    if (($costItem['cost_type_id'] ?? null) === '__new__') {
                        $newCostTypeName = trim((string) ($costItem['cost_type_name'] ?? ''));
                        $newCostType = market_management_create_cost_type($pdo, $newCostTypeName);
                        $costItem['cost_type_id'] = (int) $newCostType['id'];
                    }
                    unset($costItem['cost_type_name']);
                    if (isset($costItem['id'])) {
                        $costItemId = market_management_require_positive_id($costItem['id'], 'cost_item_id');
                        unset($costItem['id']);
                        market_management_update_cost_item($pdo, $costItemId, $costItem);
                    } else {
                        $costItem['occurrence_id'] = $id;
                        market_management_create_cost_item($pdo, $costItem);
                    }
                }
            }
            market_management_update_occurrence($pdo, $id, $fields);
            if ($costTransactionStarted) {
                $pdo->commit();
                $costTransactionStarted = false;
            }
        }
        } else {
            throw new InvalidArgumentException('Ungültiger Bearbeitungsbereich.');
        }
        echo json_encode(['ok' => true]);
        exit;
    } catch (Throwable $error) {
        if ($costTransactionStarted && $pdo->inTransaction()) {
            $pdo->rollBack();
        }
        http_response_code(422);
        echo json_encode(['ok' => false, 'error' => $error->getMessage()], JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES);
        exit;
    }
}

if (($requestMethod === 'GET') && ($_GET['action'] ?? '') === 'create_options') {
    echo json_encode([
        'ok' => true,
        'market_definitions' => market_management_list_active_market_definitions($pdo),
    ], JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES);
    exit;
}

$occurrenceId = filter_input(INPUT_GET, 'id', FILTER_VALIDATE_INT);
if (!is_int($occurrenceId) || $occurrenceId <= 0) {
    http_response_code(400);
    echo json_encode(['ok' => false, 'error' => 'Invalid occurrence id']);
    exit;
}

$occurrence = market_management_get_occurrence($pdo, $occurrenceId);
if ($occurrence === null) {
    http_response_code(404);
    echo json_encode(['ok' => false, 'error' => 'Occurrence not found']);
    exit;
}

$market = market_management_get_market($pdo, (int) $occurrence['market_definition_id']);
if ($market === null) {
    http_response_code(404);
    echo json_encode(['ok' => false, 'error' => 'Market not found']);
    exit;
}

echo json_encode(['ok' => true, 'market' => $market, 'occurrence' => $occurrence], JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES);