<?php
declare(strict_types=1);

require_once __DIR__ . '/service.php';

function market_management_mcp_token(array $env): string
{
    $token = env_value('MARKET_MCP_TOKEN', $env);
    if ($token === '') {
        throw new RuntimeException('MARKET_MCP_TOKEN ist nicht konfiguriert.');
    }
    return $token;
}

function market_management_mcp_authorize(array $env): string
{
    $header = (string) ($_SERVER['HTTP_AUTHORIZATION'] ?? '');
    if (!preg_match('/^Bearer\s+(.+)$/i', trim($header), $matches)) {
        throw new RuntimeException('Bearer-Token fehlt.');
    }

    $token = trim($matches[1]);
    $expected = market_management_mcp_token($env);
    if ($token === '' || !hash_equals($expected, $token)) {
        throw new RuntimeException('Bearer-Token ist ungültig.');
    }

    return 'bearer:' . hash('sha256', $token);
}

function market_management_mcp_tools(): array
{
    return [
        ['name' => 'market_management.search_markets', 'description' => 'Märkte suchen', 'inputSchema' => ['type' => 'object']],
        ['name' => 'market_management.search_occurrences', 'description' => 'Durchführungen suchen und auflisten', 'inputSchema' => ['type' => 'object']],
        ['name' => 'market_management.get_market', 'description' => 'Markt mit Durchführungen lesen', 'inputSchema' => ['type' => 'object', 'required' => ['market_id']]],
        ['name' => 'market_management.create_market', 'description' => 'Markt mit bestehender Kategorie anlegen', 'inputSchema' => ['type' => 'object', 'required' => ['name', 'category_id']]],
        ['name' => 'market_management.update_market', 'description' => 'Markt ändern', 'inputSchema' => ['type' => 'object', 'required' => ['market_id']]],
        ['name' => 'market_management.archive_market', 'description' => 'Markt archivieren', 'inputSchema' => ['type' => 'object', 'required' => ['market_id']]],
        ['name' => 'market_management.reactivate_market', 'description' => 'Markt reaktivieren', 'inputSchema' => ['type' => 'object', 'required' => ['market_id']]],
        ['name' => 'market_management.list_categories', 'description' => 'Bestehende Kategorien lesen', 'inputSchema' => ['type' => 'object']],
        ['name' => 'market_management.list_reference_data', 'description' => 'Kategorien, Kantone und Gemeinden lesen', 'inputSchema' => ['type' => 'object']],
        ['name' => 'market_management.get_overview', 'description' => 'Marktübersicht mit serverseitigen Filtern lesen', 'inputSchema' => ['type' => 'object']],
        ['name' => 'market_management.create_occurrence', 'description' => 'Durchführung mit mindestens einem Tag anlegen', 'inputSchema' => ['type' => 'object', 'required' => ['market_definition_id', 'days']]],
        ['name' => 'market_management.get_occurrence', 'description' => 'Durchführung mit Tagen lesen', 'inputSchema' => ['type' => 'object', 'required' => ['occurrence_id']]],
        ['name' => 'market_management.update_occurrence', 'description' => 'Durchführung ändern', 'inputSchema' => ['type' => 'object', 'required' => ['occurrence_id']]],
        ['name' => 'market_management.archive_occurrence', 'description' => 'Durchführung archivieren', 'inputSchema' => ['type' => 'object', 'required' => ['occurrence_id']]],
        ['name' => 'market_management.reactivate_occurrence', 'description' => 'Durchführung reaktivieren', 'inputSchema' => ['type' => 'object', 'required' => ['occurrence_id']]],
        ['name' => 'market_management.create_day', 'description' => 'Durchführungstag anlegen', 'inputSchema' => ['type' => 'object', 'required' => ['occurrence_id', 'date']]],
        ['name' => 'market_management.update_day', 'description' => 'Durchführungstag ändern', 'inputSchema' => ['type' => 'object', 'required' => ['day_id']]],
        ['name' => 'market_management.delete_day', 'description' => 'Durchführungstag entfernen', 'inputSchema' => ['type' => 'object', 'required' => ['day_id']]],
        ['name' => 'market_management.set_organizer', 'description' => 'Veranstalter einer Durchführung setzen', 'inputSchema' => ['type' => 'object', 'required' => ['occurrence_id', 'organization_contact_id', 'contact_person_id']]],
        ['name' => 'market_management.delete_organizer', 'description' => 'Veranstalter einer Durchführung entfernen', 'inputSchema' => ['type' => 'object', 'required' => ['occurrence_id']]],
        ['name' => 'market_management.create_cost_item', 'description' => 'Kostenposition anlegen', 'inputSchema' => ['type' => 'object', 'required' => ['occurrence_id', 'cost_type', 'gross_amount', 'tax_status']]],
        ['name' => 'market_management.update_cost_item', 'description' => 'Kostenposition ändern', 'inputSchema' => ['type' => 'object', 'required' => ['cost_item_id']]],
        ['name' => 'market_management.delete_cost_item', 'description' => 'Kostenposition entfernen', 'inputSchema' => ['type' => 'object', 'required' => ['cost_item_id']]],
    ];
}

function market_management_mcp_is_write_tool(string $tool): bool
{
    return in_array($tool, [
        'market_management.create_market', 'market_management.update_market',
        'market_management.archive_market', 'market_management.reactivate_market',
        'market_management.create_occurrence', 'market_management.update_occurrence',
        'market_management.archive_occurrence', 'market_management.reactivate_occurrence',
        'market_management.create_day', 'market_management.update_day', 'market_management.delete_day',
        'market_management.set_organizer', 'market_management.delete_organizer',
        'market_management.create_cost_item', 'market_management.update_cost_item',
        'market_management.delete_cost_item',
    ], true);
}

function market_management_mcp_call_idempotent(PDO $pdo, string $userSubject, string $tool, array $arguments): array
{
    if (!market_management_mcp_is_write_tool($tool)) {
        return market_management_mcp_call($pdo, $tool, $arguments);
    }

    $idempotencyKey = trim((string) ($arguments['idempotency_key'] ?? ''));
    if ($idempotencyKey === '') {
        throw new InvalidArgumentException('Schreibende MCP-Aufrufe benötigen idempotency_key.');
    }
    $clientId = trim((string) ($arguments['client_id'] ?? 'hermes'));
    if ($clientId === '') {
        throw new InvalidArgumentException('client_id darf nicht leer sein.');
    }
    $businessArguments = $arguments;
    unset($businessArguments['idempotency_key'], $businessArguments['client_id']);
    $requestHash = hash('sha256', json_encode([
        'tool' => $tool,
        'arguments' => $businessArguments,
    ], JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES | JSON_THROW_ON_ERROR));

    $pdo->beginTransaction();
    try {
        $existingStmt = $pdo->prepare(
            'SELECT user_subject, request_hash, result_status, result_payload
             FROM market_mcp_idempotency
             WHERE client_id = :client_id AND idempotency_key = :idempotency_key
             FOR UPDATE'
        );
        $existingStmt->execute([':client_id' => $clientId, ':idempotency_key' => $idempotencyKey]);
        $existing = $existingStmt->fetch();
        if (is_array($existing)) {
            if ((string) $existing['user_subject'] !== $userSubject || (string) $existing['request_hash'] !== $requestHash) {
                throw new InvalidArgumentException('Idempotency-Schlüssel wurde bereits für eine andere Anfrage verwendet.');
            }
            if ((string) $existing['result_status'] === 'succeeded' && $existing['result_payload'] !== null) {
                $pdo->commit();
                return (array) json_decode((string) $existing['result_payload'], true, 512, JSON_THROW_ON_ERROR);
            }
            throw new RuntimeException('Idempotency-Anfrage wird bereits verarbeitet oder ist fehlgeschlagen.');
        }

        $insert = $pdo->prepare(
            'INSERT INTO market_mcp_idempotency
             (user_subject, client_id, idempotency_key, tool_name, request_hash, result_status, expires_at)
             VALUES (:user_subject, :client_id, :idempotency_key, :tool_name, :request_hash, \'processing\', NOW() + INTERVAL \'24 hours\')'
        );
        $insert->execute([
            ':user_subject' => $userSubject,
            ':client_id' => $clientId,
            ':idempotency_key' => $idempotencyKey,
            ':tool_name' => $tool,
            ':request_hash' => $requestHash,
        ]);
        $result = market_management_mcp_call($pdo, $tool, $businessArguments);
        $update = $pdo->prepare(
            'UPDATE market_mcp_idempotency
             SET result_status = \'succeeded\', result_payload = CAST(:result_payload AS JSONB)
             WHERE client_id = :client_id AND idempotency_key = :idempotency_key'
        );
        $update->execute([
            ':result_payload' => json_encode($result, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES | JSON_THROW_ON_ERROR),
            ':client_id' => $clientId,
            ':idempotency_key' => $idempotencyKey,
        ]);
        $pdo->commit();
        return $result;
    } catch (Throwable $e) {
        if ($pdo->inTransaction()) {
            $pdo->rollBack();
        }
        throw $e;
    }
}

function market_management_mcp_call(PDO $pdo, string $tool, array $arguments): array
{
    return match ($tool) {
        'market_management.search_markets' => market_management_search_markets($pdo, $arguments),
        'market_management.search_occurrences' => market_management_search_occurrences($pdo, $arguments),
        'market_management.get_market' => market_management_get_market(
            $pdo,
            market_management_require_positive_id($arguments['market_id'] ?? null, 'market_id'),
            (bool) ($arguments['include_archived'] ?? false)
        ) ?? throw new RuntimeException('Markt nicht gefunden.'),
        'market_management.create_market' => market_management_create_market($pdo, $arguments),
        'market_management.update_market' => market_management_update_market(
            $pdo,
            market_management_require_positive_id($arguments['market_id'] ?? null, 'market_id'),
            $arguments
        ),
        'market_management.archive_market' => market_management_set_market_archive(
            $pdo,
            market_management_require_positive_id($arguments['market_id'] ?? null, 'market_id'),
            true
        ),
        'market_management.reactivate_market' => market_management_set_market_archive(
            $pdo,
            market_management_require_positive_id($arguments['market_id'] ?? null, 'market_id'),
            false
        ),
        'market_management.list_categories' => market_management_list_categories($pdo),
        'market_management.list_reference_data' => market_management_list_reference_data($pdo, $arguments),
        'market_management.get_overview' => [
            'markets' => market_management_search_markets($pdo, $arguments),
            'occurrences' => market_management_search_occurrences($pdo, $arguments),
        ],
        'market_management.create_occurrence' => market_management_create_occurrence($pdo, $arguments),
        'market_management.get_occurrence' => market_management_get_occurrence(
            $pdo,
            market_management_require_positive_id($arguments['occurrence_id'] ?? null, 'occurrence_id'),
            (bool) ($arguments['include_archived'] ?? false)
        ) ?? throw new RuntimeException('Durchführung nicht gefunden.'),
        'market_management.update_occurrence' => market_management_update_occurrence(
            $pdo,
            market_management_require_positive_id($arguments['occurrence_id'] ?? null, 'occurrence_id'),
            $arguments
        ),
        'market_management.archive_occurrence' => market_management_set_occurrence_archive(
            $pdo,
            market_management_require_positive_id($arguments['occurrence_id'] ?? null, 'occurrence_id'),
            true
        ),
        'market_management.reactivate_occurrence' => market_management_set_occurrence_archive(
            $pdo,
            market_management_require_positive_id($arguments['occurrence_id'] ?? null, 'occurrence_id'),
            false
        ),
        'market_management.create_day' => market_management_create_day($pdo, $arguments),
        'market_management.update_day' => market_management_update_day(
            $pdo,
            market_management_require_positive_id($arguments['day_id'] ?? null, 'day_id'),
            $arguments
        ),
        'market_management.delete_day' => market_management_delete_day(
            $pdo,
            market_management_require_positive_id($arguments['day_id'] ?? null, 'day_id')
        ),
        'market_management.set_organizer' => market_management_set_organizer($pdo, $arguments),
        'market_management.delete_organizer' => market_management_delete_organizer(
            $pdo,
            market_management_require_positive_id($arguments['occurrence_id'] ?? null, 'occurrence_id')
        ),
        'market_management.create_cost_item' => market_management_create_cost_item($pdo, $arguments),
        'market_management.update_cost_item' => market_management_update_cost_item(
            $pdo,
            market_management_require_positive_id($arguments['cost_item_id'] ?? null, 'cost_item_id'),
            $arguments
        ),
        'market_management.delete_cost_item' => market_management_delete_cost_item(
            $pdo,
            market_management_require_positive_id($arguments['cost_item_id'] ?? null, 'cost_item_id')
        ),
        default => throw new InvalidArgumentException('Unbekanntes MCP-Tool: ' . $tool),
    };
}