// Copyright (c) 2018 SAP SE or an SAP affiliate company. All rights reserved. This file is licensed under the Apache Software License, v. 2 except as noted otherwise in the LICENSE file
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package helper

import (
	"fmt"

	api "github.com/gardener/gardener-extension-provider-aws/pkg/apis/aws"
)

// FindInstanceProfileForPurpose takes a list of instance profiles and tries to find the first entry
// whose purpose matches with the given purpose. If no such entry is found then an error will be
// returned.
func FindInstanceProfileForPurpose(instanceProfiles []api.InstanceProfile, purpose string) (*api.InstanceProfile, error) {
	for _, instanceProfile := range instanceProfiles {
		if instanceProfile.Purpose == purpose {
			return &instanceProfile, nil
		}
	}
	return nil, fmt.Errorf("no instance profile with purpose %q found", purpose)
}

// FindRoleForPurpose takes a list of roles and tries to find the first entry
// whose purpose matches with the given purpose. If no such entry is found then an error will be
// returned.
func FindRoleForPurpose(roles []api.Role, purpose string) (*api.Role, error) {
	for _, role := range roles {
		if role.Purpose == purpose {
			return &role, nil
		}
	}
	return nil, fmt.Errorf("no role with purpose %q found", purpose)
}

// FindSecurityGroupForPurpose takes a list of security groups and tries to find the first entry
// whose purpose matches with the given purpose. If no such entry is found then an error will be
// returned.
func FindSecurityGroupForPurpose(securityGroups []api.SecurityGroup, purpose string) (*api.SecurityGroup, error) {
	for _, securityGroup := range securityGroups {
		if securityGroup.Purpose == purpose {
			return &securityGroup, nil
		}
	}
	return nil, fmt.Errorf("no security group with purpose %q found", purpose)
}

// FindSubnetForPurpose takes a list of subnets and tries to find the first entry
// whose purpose matches with the given purpose. If no such entry is found then
// an error will be returned.
func FindSubnetForPurpose(subnets []api.Subnet, purpose string) (*api.Subnet, error) {
	for _, subnet := range subnets {
		if subnet.Purpose == purpose {
			return &subnet, nil
		}
	}
	return nil, fmt.Errorf("no subnet with purpose %q found", purpose)
}

// FindSubnetForPurposeAndZone takes a list of subnets and tries to find the first entry
// whose purpose and zone matches with the given purpose and zone. If no such entry is found then
// an error will be returned.
func FindSubnetForPurposeAndZone(subnets []api.Subnet, purpose, zone string) (*api.Subnet, error) {
	for _, subnet := range subnets {
		if subnet.Purpose == purpose && subnet.Zone == zone {
			return &subnet, nil
		}
	}
	return nil, fmt.Errorf("no subnet with purpose %q in zone %q found", purpose, zone)
}

// FindMachineImage takes a list of machine images and tries to find the first entry
// whose name, version, and zone matches with the given name, version, and region. If no such entry is
// found then an error will be returned.
func FindMachineImage(machineImages []api.MachineImage, name, version string) (*api.MachineImage, error) {
	for _, machineImage := range machineImages {
		if machineImage.Name == name && machineImage.Version == version {
			return &machineImage, nil
		}
	}
	return nil, fmt.Errorf("no machine image with name %q, version %q found", name, version)
}

// FindAMIForRegionFromCloudProfile takes a list of machine images, and the desired image name, version, and region. It tries
// to find the image with the given name and version in the desired region. If it cannot be found then an error
// is returned.
func FindAMIForRegionFromCloudProfile(cloudProfileConfig *api.CloudProfileConfig, imageName, imageVersion, regionName string) (string, error) {
	if cloudProfileConfig != nil {
		for _, machineImage := range cloudProfileConfig.MachineImages {
			if machineImage.Name != imageName {
				continue
			}
			for _, version := range machineImage.Versions {
				if imageVersion != version.Version {
					continue
				}
				for _, mapping := range version.Regions {
					if regionName == mapping.Name {
						return mapping.AMI, nil
					}
				}
			}
		}
	}

	return "", fmt.Errorf("could not find an AMI for region %q and name %q in version %q", regionName, imageName, imageVersion)
}