<?php

namespace routes;

use classes\authentication;
use classes\edge_gateway_install_service;
use classes\edge_gateway_manager;
use classes\edge_gateway_operation_exception;
use classes\edge_gateway_operation_service;
use classes\edge_gateway_registry_service;
use classes\edge_gateway_view_service;
use classes\response;
use Exception;
use traits\route_t;

class edgeGatewaysRoute
{
    use route_t;

    public function run(): void
    {
        $this->get('/edge-gateways', fn() => $this->handleListGateways(), [
            'modules_shelly_config' => 'Manage department edge gateways for local Shelly control',
        ]);
        $this->get('/edge-gateways/{id}', fn() => $this->handleGatewayDetail(), [
            'modules_shelly_config' => 'View department edge gateway detail',
        ]);
        $this->put('/edge-gateways/{id}', fn() => $this->handleGatewayUpdate(), [
            'modules_shelly_config' => 'Update edge gateway metadata and primary assignment',
        ]);
        $this->get('/edge-gateways/{id}/operations', fn() => $this->handleGatewayOperationsList(), [
            'modules_shelly_config' => 'List edge gateway operations',
        ]);
        $this->post('/edge-gateways/{id}/operations', fn() => $this->handleGatewayOperationCreate(), [
            'modules_shelly_config' => 'Queue an edge gateway operation',
        ]);
        $this->get('/edge-gateways/{id}/operations/{operationId}/events', fn() => $this->handleGatewayOperationEvents(), [
            'modules_shelly_config' => 'List edge gateway operation events',
        ]);
        $this->post('/edge-gateways/{id}/rotate-credentials', fn() => $this->handleGatewayCredentialRotate(), [
            'modules_shelly_config' => 'Rotate edge gateway credentials',
        ]);
        $this->post('/edge-gateways/install-token', fn() => $this->handleInstallTokenCreate(), [
            'modules_shelly_config' => 'Create a one-time Raspberry Pi edge gateway installer token',
        ]);
        $this->post('/edge-gateways/{id}/discovery', fn() => $this->handleGatewayDiscovery(), [
            'modules_shelly_config' => 'Queue Shelly discovery through the local edge gateway',
        ]);
        $this->put('/edge-gateways/{id}/bindings', fn() => $this->handleBindingsUpdate(), [
            'modules_shelly_config' => 'Approve or override relay bindings for an edge gateway',
        ]);
        $this->delete('/edge-gateways/{id}', fn() => $this->handleGatewayDelete(), [
            'modules_shelly_config' => 'Delete an edge gateway registration',
        ]);
        $this->post('/departments/{id}/gateway-cutover', fn() => $this->handleDepartmentCutover(), [
            'modules_shelly_config' => 'Cut a department over from Shelly cloud to local edge gateways',
        ]);

        $this->get('/edge-agent/install-token/verify', fn() => $this->handleInstallTokenVerify());
        $this->get('/edge-agent/install.sh', fn() => $this->renderInstallScript());
        $this->get('/edge-agent/artifacts/agent.php', fn() => $this->renderArtifact('agent.php'));
        $this->get('/edge-agent/artifacts/truckwash-edge-agent.service', fn() => $this->renderArtifact('truckwash-edge-agent.service'));
        $this->post('/edge-agent/claim', fn() => $this->handleAgentClaim());
        $this->post('/edge-agent/gateways/{id}/heartbeat', fn() => $this->handleAgentHeartbeat());
        $this->post('/edge-agent/gateways/{id}/operations/next', fn() => $this->handleAgentOperationNext());
        $this->post('/edge-agent/gateways/{id}/operations/{operationId}/events', fn() => $this->handleAgentOperationEvent());
        $this->post('/edge-agent/gateways/{id}/operations/{operationId}/complete', fn() => $this->handleAgentOperationComplete());
        $this->post('/edge-agent/gateways/{id}/commands/poll', fn() => $this->handleAgentCommandPoll());
        $this->post('/edge-agent/gateways/{id}/commands/{jobId}/result', fn() => $this->handleAgentCommandResult());
        $this->post('/edge-agent/gateways/{id}/presence', fn() => $this->handleAgentPresence());
    }

    private function handleListGateways(): void
    {
        global /** @var response $response */ $response;
        $this->requirePermission('modules_shelly_config');

        $departmentId = self::isParametersSet(['department_id']) ? (int)self::getParameter('department_id') : null;
        $view = trim((string)$this->fromQuery('view'));
        if ($departmentId !== null && $departmentId > 0) {
            $this->requireDepartmentAccess($departmentId);
        }

        $gateways = $this->views()->listGateways($departmentId, $view !== 'summary');
        $response->add_meta('fleet_usage', $this->views()->buildFleetUsageStatistics($departmentId, $gateways));
        $response->success($gateways);
    }

    private function handleGatewayDetail(): void
    {
        global /** @var response $response */ $response;
        $this->requirePermission('modules_shelly_config');
        $response->success($this->requireGatewayAccess((int)$this->fromRoute('id')));
    }

    private function handleGatewayUpdate(): void
    {
        global /** @var response $response */ $response;
        $this->requirePermission('modules_shelly_config');
        self::requireParameters(['label', 'is_primary']);
        self::requireType(self::getParameter('label'), self::TYPE_STRING());
        self::requireType(self::getParameter('is_primary'), self::TYPE_BOOL());

        $gatewayId = (int)$this->fromRoute('id');
        $this->requireGatewayAccess($gatewayId);

        $response->success($this->registry()->updateGatewayMetadata($gatewayId, [
            'label' => (string)self::getParameter('label'),
            'is_primary' => (bool)self::getParameter('is_primary'),
        ], $this->actorUserId()));
    }

    private function handleGatewayOperationsList(): void
    {
        global /** @var response $response */ $response;
        $this->requirePermission('modules_shelly_config');
        $gatewayId = (int)$this->fromRoute('id');
        $this->requireGatewayAccess($gatewayId);
        $response->success($this->operations()->listOperations($gatewayId));
    }

    private function handleGatewayOperationCreate(): void
    {
        global /** @var response $response */ $response;
        $this->requirePermission('modules_shelly_config');
        self::requireParameters(['type', 'request']);
        self::requireType(self::getParameter('type'), self::TYPE_STRING());
        self::requireType(self::getParameter('request'), self::TYPE_ARRAY());

        $gatewayId = (int)$this->fromRoute('id');
        $this->requireGatewayAccess($gatewayId);

        try {
            $operation = $this->operations()->queueOperation(
                $gatewayId,
                (string)self::getParameter('type'),
                (array)self::getParameter('request'),
                $this->actorUserId()
            );
            $response->success([
                'operation' => $operation,
                'gateway' => $this->views()->getGateway($gatewayId),
            ], 201);
        } catch (edge_gateway_operation_exception $exception) {
            $response->error([
                'message' => $exception->getMessage(),
                'error_code' => $exception->errorCode,
            ], $exception->status);
        }
    }

    private function handleGatewayOperationEvents(): void
    {
        global /** @var response $response */ $response;
        $this->requirePermission('modules_shelly_config');
        $gatewayId = (int)$this->fromRoute('id');
        $operationId = (int)$this->fromRoute('operationId');
        self::requireParameterIntPositive($operationId, 'operationId');
        $this->requireGatewayAccess($gatewayId);
        $response->success($this->operations()->listOperationEvents($gatewayId, $operationId));
    }

    private function handleGatewayCredentialRotate(): void
    {
        global /** @var response $response */ $response;
        $this->requirePermission('modules_shelly_config');
        $gatewayId = (int)$this->fromRoute('id');
        $this->requireGatewayAccess($gatewayId);
        $response->success($this->operations()->rotateCredentials($gatewayId, $this->actorUserId()));
    }

    private function handleInstallTokenCreate(): void
    {
        global /** @var response $response */ $response;
        $this->requirePermission('modules_shelly_config');
        self::requireParameters(['department_id']);

        $departmentId = (int)self::getParameter('department_id');
        self::requireParameterIntPositive($departmentId, 'department_id');
        $this->requireDepartmentAccess($departmentId);

        $response->success(
            $this->registry()->createInstallToken(
                $departmentId,
                self::isParametersSet(['label']) ? (string)self::getParameter('label') : null,
                $this->actorUserId()
            ),
            201
        );
    }

    private function handleGatewayDiscovery(): void
    {
        global /** @var response $response */ $response;
        $this->requirePermission('modules_shelly_config');

        $gatewayId = (int)$this->fromRoute('id');
        $this->requireGatewayAccess($gatewayId);

        $this->operations()->queueDiscoveryOperation($gatewayId, $this->actorUserId());
        $response->success($this->views()->getGateway($gatewayId));
    }

    private function handleBindingsUpdate(): void
    {
        global /** @var response $response */ $response;
        $this->requirePermission('modules_shelly_config');
        self::requireParameters(['bindings']);
        self::requireType(self::getParameter('bindings'), self::TYPE_ARRAY());

        $gatewayId = (int)$this->fromRoute('id');
        $this->requireGatewayAccess($gatewayId);
        $this->registry()->setRelayBindings($gatewayId, (array)self::getParameter('bindings'), $this->actorUserId());
        $response->success($this->views()->getGateway($gatewayId));
    }

    private function handleGatewayDelete(): void
    {
        global /** @var response $response */ $response;
        $this->requirePermission('modules_shelly_config');
        $gatewayId = (int)$this->fromRoute('id');
        $this->requireGatewayAccess($gatewayId);
        $response->success($this->registry()->deleteGateway($gatewayId, $this->actorUserId()));
    }

    private function handleDepartmentCutover(): void
    {
        global /** @var response $response */ $response;
        $this->requirePermission('modules_shelly_config');
        self::requireParameters(['transport_mode']);
        $departmentId = (int)$this->fromRoute('id');
        self::requireParameterIntPositive($departmentId, 'id');
        $this->requireDepartmentAccess($departmentId);
        $response->success($this->registry()->setDepartmentTransportMode($departmentId, (string)self::getParameter('transport_mode'), $this->actorUserId()));
    }

    private function renderInstallScript(): void
    {
        $token = trim((string)$this->fromQuery('token'));
        if ($token === '') {
            http_response_code(400);
            echo 'Missing token';
            exit;
        }

        header('Content-Type: text/x-shellscript; charset=utf-8');
        echo $this->install()->buildInstallScript($token);
        exit;
    }

    private function handleInstallTokenVerify(): void
    {
        global /** @var response $response */ $response;
        $token = trim((string)$this->fromQuery('token'));
        if ($token === '') {
            $response->error('Missing token', 400);
        }

        $response->success($this->install()->verifyInstallToken($token));
    }

    private function renderArtifact(string $fileName): void
    {
        try {
            header('Content-Type: ' . $this->install()->contentType($fileName));
            echo $this->install()->readArtifact($fileName);
            exit;
        } catch (Exception $exception) {
            http_response_code(404);
            echo $exception->getMessage();
            exit;
        }
    }

    private function handleAgentClaim(): void
    {
        global /** @var response $response */ $response;
        self::requireParameters(['token']);
        $payload = self::getParametersAsArray();

        $response->success(
            $this->registry()->claimGateway(
                (string)$payload['token'],
                trim((string)($payload['hostname'] ?? gethostname() ?: 'unknown-gateway')),
                isset($payload['installed_version']) ? (string)$payload['installed_version'] : null,
                isset($payload['metadata']) && is_array($payload['metadata']) ? (array)$payload['metadata'] : []
            ),
            201
        );
    }

    private function handleAgentHeartbeat(): void
    {
        global /** @var response $response */ $response;
        $gatewayId = (int)$this->fromRoute('id');
        $payload = self::getParametersAsArray();
        $response->success($this->registry()->recordHeartbeat($gatewayId, $this->requireAgentToken($payload), $payload));
    }

    private function handleAgentOperationNext(): void
    {
        global /** @var response $response */ $response;
        $gatewayId = (int)$this->fromRoute('id');
        $payload = self::getParametersAsArray();

        try {
            $response->success($this->operations()->claimNextOperation(
                $gatewayId,
                $this->requireAgentToken($payload),
                isset($payload['wait_seconds']) ? (int)$payload['wait_seconds'] : edge_gateway_manager::COMMAND_POLL_TIMEOUT_SECONDS,
                isset($payload['agent_instance_id']) ? (string)$payload['agent_instance_id'] : null
            ));
        } catch (edge_gateway_operation_exception $exception) {
            $response->error([
                'message' => $exception->getMessage(),
                'error_code' => $exception->errorCode,
            ], $exception->status);
        }
    }

    private function handleAgentOperationEvent(): void
    {
        global /** @var response $response */ $response;
        $gatewayId = (int)$this->fromRoute('id');
        $operationId = (int)$this->fromRoute('operationId');
        self::requireParameterIntPositive($operationId, 'operationId');
        $payload = self::getParametersAsArray();

        try {
            $response->success($this->operations()->appendAgentOperationEvent(
                $gatewayId,
                $operationId,
                $this->requireAgentToken($payload),
                $payload
            ));
        } catch (edge_gateway_operation_exception $exception) {
            $response->error([
                'message' => $exception->getMessage(),
                'error_code' => $exception->errorCode,
            ], $exception->status);
        }
    }

    private function handleAgentOperationComplete(): void
    {
        global /** @var response $response */ $response;
        $gatewayId = (int)$this->fromRoute('id');
        $operationId = (int)$this->fromRoute('operationId');
        self::requireParameterIntPositive($operationId, 'operationId');
        $payload = self::getParametersAsArray();

        try {
            $response->success($this->operations()->completeAgentOperation(
                $gatewayId,
                $operationId,
                $this->requireAgentToken($payload),
                $payload
            ));
        } catch (edge_gateway_operation_exception $exception) {
            $response->error([
                'message' => $exception->getMessage(),
                'error_code' => $exception->errorCode,
            ], $exception->status);
        }
    }

    private function handleAgentCommandPoll(): void
    {
        global /** @var response $response */ $response;
        $gatewayId = (int)$this->fromRoute('id');
        $payload = self::getParametersAsArray();
        $response->success($this->manager()->pollCommand(
            $gatewayId,
            $this->requireAgentToken($payload),
            isset($payload['wait_seconds']) ? (int)$payload['wait_seconds'] : edge_gateway_manager::COMMAND_POLL_TIMEOUT_SECONDS
        ));
    }

    private function handleAgentCommandResult(): void
    {
        global /** @var response $response */ $response;
        $gatewayId = (int)$this->fromRoute('id');
        $jobId = (int)$this->fromRoute('jobId');
        self::requireParameterIntPositive($jobId, 'jobId');

        $payload = self::getParametersAsArray();
        $response->success($this->manager()->submitCommandResult(
            $gatewayId,
            $jobId,
            $this->requireAgentToken($payload),
            (bool)($payload['ok'] ?? false),
            isset($payload['result']) && is_array($payload['result']) ? (array)$payload['result'] : [],
            isset($payload['error']) ? (string)$payload['error'] : null
        ));
    }

    private function handleAgentPresence(): void
    {
        global /** @var response $response */ $response;
        $gatewayId = (int)$this->fromRoute('id');
        $payload = self::getParametersAsArray();

        $this->requireAgentToken($payload);

        $response->success($this->manager()->recordBrokerPresence(
            $gatewayId,
            isset($payload['status']) ? (string)$payload['status'] : 'disconnected',
            isset($payload['connection_id']) ? (string)$payload['connection_id'] : null,
            isset($payload['reason']) ? (string)$payload['reason'] : null,
            isset($payload['metadata']) && is_array($payload['metadata']) ? (array)$payload['metadata'] : []
        ));
    }

    private function requireGatewayAccess(int $gatewayId): array
    {
        self::requireParameterIntPositive($gatewayId, 'id');
        $gateway = $this->views()->getGateway($gatewayId);
        $this->requireDepartmentAccess((int)$gateway['department_id']);
        return $gateway;
    }

    private function requireAgentToken(array $payload): string
    {
        global /** @var response $response */ $response;
        $token = trim((string)($payload['agent_token'] ?? $this->fromRequest('agent_token')));
        if ($token === '') {
            $response->error('Missing edge gateway agent token', 401);
        }

        return $token;
    }

    private function actorUserId(): ?int
    {
        $user = (new authentication())->get_user();
        return $user ? (int)$user->id : null;
    }

    private function views(): edge_gateway_view_service
    {
        return new edge_gateway_view_service();
    }

    private function registry(): edge_gateway_registry_service
    {
        return new edge_gateway_registry_service();
    }

    private function manager(): edge_gateway_manager
    {
        return new edge_gateway_manager();
    }

    private function operations(): edge_gateway_operation_service
    {
        return new edge_gateway_operation_service($this->manager());
    }

    private function install(): edge_gateway_install_service
    {
        return new edge_gateway_install_service();
    }
}