"use strict";

// Lambda function for synchronizing Magnolia and completing auto-scaling lifecycle
exports.lambdaFunction = function(event, context, callback) {

    var magnoliaAuthorInstanceIpAddress = event.MagnoliaAuthorInstanceIpAddress;
    if(!magnoliaAuthorInstanceIpAddress) {
        fail("Magnolia author instance IP address not available (" + JSON.stringify(event) + ").", callback);
        return;
    }
    var magnoliaPublicInstanceIpAddress = event.MagnoliaPublicInstanceIpAddress;
    if(!magnoliaPublicInstanceIpAddress) {
        fail("Magnolia public instance IP address not available (" + JSON.stringify(event) + ").", callback);
        return;
    }
    var httpMethod = event.HttpMethod;
    if(!httpMethod) {
        fail("HTTP method not available (" + JSON.stringify(event) + ").", callback);
        return;
    }
    var autoScalingGroupName = event.AutoScalingGroupName;
    if(!autoScalingGroupName) {
        fail("Auto-scaling group name not available (" + JSON.stringify(event) + ").", callback);
        return;
    }
    var lifecycleHookName = event.LifecycleHookName;
    if(!lifecycleHookName) {
        fail("Lifecycle hook name not available (" + JSON.stringify(event) + ").", callback);
        return;
    }
    var lifecycleActionToken = event.LifecycleActionToken;
    if(!lifecycleActionToken) {
        fail("Lifecycle hook token not available (" + JSON.stringify(event) + ").", callback);
        return;
    }
    var ec2InstanceID = event.EC2InstanceID;
    if(!ec2InstanceID) {
        fail("EC2 instance ID not available (" + JSON.stringify(event) + ").", callback);
        return;
    }

    // call Magnolia synchronisation API
    var magnoliaHostDetails = { MagnoliaAuthorHost: magnoliaAuthorInstanceIpAddress, MagnoliaPublicHost : magnoliaPublicInstanceIpAddress, Method: httpMethod };
    var promise = invokeLambdaFunction('{{EnvironmentName}}-magnoliaCallSyncAPI', magnoliaHostDetails, callback );

    promise.then(function(result) {

    // complete auto-scaling group lifecycle action if Magnolia synchronisation succeeded
    var asgLifecycleDetails = {
        AutoScalingGroupName: autoScalingGroupName,
        LifecycleHookName : lifecycleHookName,
        LifecycleActionToken: lifecycleActionToken,
        LifecycleActionResult: 'CONTINUE',
        InstanceId: ec2InstanceID };

    promise = invokeLambdaFunction('{{EnvironmentName}}-asgCompleteLifecycleAction', asgLifecycleDetails, callback );

    promise.then(function(result) {
        logInfo("Auto-scaling lifecycle action completed for instance ID'" + ec2InstanceID + "'.");
    },

    function(err) { fail(err, callback); });
    },
    function(err) { fail(err, callback); });

}

// include: library code
{{ include('magnolia-autoscaling-sync-stack/javascript/lambda-util-invoke-function.js') }}
{{ include('magnolia-autoscaling-sync-stack/javascript/lambda-util-logging.js') }}