/*
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 bootstrap

import (
	"github.com/pelletier/go-toml/v2"
)

func NewBottlerocketConfig(userdata *string) (*BottlerocketConfig, error) {
	c := &BottlerocketConfig{}
	if userdata == nil {
		return c, nil
	}
	if err := c.UnmarshalTOML([]byte(*userdata)); err != nil {
		return c, err
	}
	return c, nil
}

// BottlerocketConfig is the root of the bottlerocket config, see more here https://github.com/bottlerocket-os/bottlerocket#using-user-data
type BottlerocketConfig struct {
	SettingsRaw map[string]interface{} `toml:"settings"`
	Settings    BottlerocketSettings   `toml:"-"`
}

// BottlerocketSettings is a subset of all configuration in https://github.com/bottlerocket-os/bottlerocket/blob/develop/sources/models/src/aws-k8s-1.22/mod.rs
// These settings apply across all K8s versions that karpenter supports.
type BottlerocketSettings struct {
	Kubernetes BottlerocketKubernetes `toml:"kubernetes"`
}

// BottlerocketKubernetes is k8s specific configuration for bottlerocket api
type BottlerocketKubernetes struct {
	APIServer                   *string                          `toml:"api-server"`
	CloudProvider               *string                          `toml:"cloud-provider"`
	ClusterCertificate          *string                          `toml:"cluster-certificate"`
	ClusterName                 *string                          `toml:"cluster-name"`
	ClusterDNSIP                *string                          `toml:"cluster-dns-ip,omitempty"`
	NodeLabels                  map[string]string                `toml:"node-labels,omitempty"`
	NodeTaints                  map[string][]string              `toml:"node-taints,omitempty"`
	MaxPods                     *int                             `toml:"max-pods,omitempty"`
	StaticPods                  map[string]BottlerocketStaticPod `toml:"static-pods,omitempty"`
	EvictionHard                map[string]string                `toml:"eviction-hard,omitempty"`
	KubeReserved                map[string]string                `toml:"kube-reserved,omitempty"`
	SystemReserved              map[string]string                `toml:"system-reserved,omitempty"`
	AllowedUnsafeSysctls        []string                         `toml:"allowed-unsafe-sysctls,omitempty"`
	ServerTLSBootstrap          *bool                            `toml:"server-tls-bootstrap,omitempty"`
	RegistryQPS                 *int                             `toml:"registry-qps,omitempty"`
	RegistryBurst               *int                             `toml:"registry-burst,omitempty"`
	EventQPS                    *int                             `toml:"event-qps,omitempty"`
	EventBurst                  *int                             `toml:"event-burst,omitempty"`
	KubeAPIQPS                  *int                             `toml:"kube-api-qps,omitempty"`
	KubeAPIBurst                *int                             `toml:"kube-api-burst,omitempty"`
	ContainerLogMaxSize         *string                          `toml:"container-log-max-size,omitempty"`
	ContainerLogMaxFiles        *int                             `toml:"container-log-max-files,omitempty"`
	CPUManagerPolicy            *string                          `toml:"cpu-manager-policy,omitempty"`
	CPUManagerReconcilePeriod   *string                          `toml:"cpu-manager-reconcile-period,omitempty"`
	TopologyManagerScope        *string                          `toml:"topology-manager-scope,omitempty"`
	ImageGCHighThresholdPercent *string                          `toml:"image-gc-high-threshold-percent,omitempty"`
	ImageGCLowThresholdPercent  *string                          `toml:"image-gc-low-threshold-percent,omitempty"`
	CPUCFSQuota                 *bool                            `toml:"cpu-cfs-quota-enforced,omitempty"`
}

type BottlerocketStaticPod struct {
	Enabled  *bool   `toml:"enabled,omitempty"`
	Manifest *string `toml:"manifest,omitempty"`
}

func (c *BottlerocketConfig) UnmarshalTOML(data []byte) error {
	// unmarshal known settings
	s := struct {
		Settings BottlerocketSettings `toml:"settings"`
	}{}
	if err := toml.Unmarshal(data, &s); err != nil {
		return err
	}
	// unmarshal untyped settings
	if err := toml.Unmarshal(data, c); err != nil {
		return err
	}
	c.Settings = s.Settings
	return nil
}

func (c *BottlerocketConfig) MarshalTOML() ([]byte, error) {
	if c.SettingsRaw == nil {
		c.SettingsRaw = map[string]interface{}{}
	}
	c.SettingsRaw["kubernetes"] = c.Settings.Kubernetes
	return toml.Marshal(c)
}