// Copyright 2016 Amazon.com, Inc. or its affiliates. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License"). You may not
// use this file except in compliance with the License. A copy of the
// License is located at
//
// http://aws.amazon.com/apache2.0/
//
// or in the "license" file accompanying this file. This file 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 configurecontainers

import (
	"fmt"

	"github.com/aws/amazon-ssm-agent/agent/appconfig"
	"github.com/aws/amazon-ssm-agent/agent/context"
	"github.com/aws/amazon-ssm-agent/agent/contracts"
	"github.com/aws/amazon-ssm-agent/agent/executers"
	"github.com/aws/amazon-ssm-agent/agent/fileutil"
	"github.com/aws/amazon-ssm-agent/agent/framework/processor/executer/iohandler"
	"github.com/aws/amazon-ssm-agent/agent/jsonutil"
	"github.com/aws/amazon-ssm-agent/agent/log"
	"github.com/aws/amazon-ssm-agent/agent/task"
)

const (
	//Action values
	INSTALL   = "Install"
	UNINSTALL = "Uninstall"
)

// Plugin is the type for the plugin.
type Plugin struct {
	context context.T
	// ExecuteCommand is an object that can execute commands.
	CommandExecuter executers.T
}

// ConfigureContainerPluginInput represents one set of commands executed by the configure container plugin.
type ConfigureContainerPluginInput struct {
	contracts.PluginInput
	ID     string
	Action string
}

// NewPlugin returns a new instance of the plugin.
func NewPlugin(context context.T) (*Plugin, error) {
	return &Plugin{
		context:         context,
		CommandExecuter: executers.ShellCommandExecuter{},
	}, nil
}

// Name returns the name of the plugin
func Name() string {
	return appconfig.PluginNameConfigureDocker
}

func (p *Plugin) Execute(config contracts.Configuration, cancelFlag task.CancelFlag, output iohandler.IOHandler) {
	log := p.context.Log()
	log.Infof("%v started with configuration %v", Name(), config)

	if cancelFlag.ShutDown() {
		output.MarkAsShutdown()
	} else if cancelFlag.Canceled() {
		output.MarkAsCancelled()
	} else {
		p.runCommandsRawInput(log, config.PluginID, config.Properties, config.OrchestrationDirectory, cancelFlag, output)
	}
	return
}

// runCommandsRawInput executes one set of commands and returns their output.
// The input is in the default json unmarshal format (e.g. map[string]interface{}).
func (p *Plugin) runCommandsRawInput(log log.T, pluginID string, rawPluginInput interface{}, orchestrationDirectory string, cancelFlag task.CancelFlag, output iohandler.IOHandler) {
	var pluginInput ConfigureContainerPluginInput
	err := jsonutil.Remarshal(rawPluginInput, &pluginInput)
	log.Debugf("Plugin input %v", pluginInput)
	if err != nil {
		errorString := fmt.Errorf("Invalid format in plugin properties %v;\nerror %v", rawPluginInput, err)
		output.MarkAsFailed(errorString)
		return
	}

	p.runCommands(log, pluginID, pluginInput, orchestrationDirectory, cancelFlag, output)
}

// runCommands executes one set of commands and returns their output.
func (p *Plugin) runCommands(log log.T, pluginID string, pluginInput ConfigureContainerPluginInput, orchestrationDirectory string, cancelFlag task.CancelFlag, output iohandler.IOHandler) {
	var err error

	// TODO:MF: This subdirectory is only needed because we could be running multiple sets of properties for the same plugin - otherwise the orchestration directory would already be unique
	orchestrationDir := fileutil.BuildPath(orchestrationDirectory, pluginInput.ID)
	log.Debugf("OrchestrationDir %v ", orchestrationDir)

	// create orchestration dir if needed
	if err = fileutil.MakeDirs(orchestrationDir); err != nil {
		log.Debug("failed to create orchestrationDir directory", orchestrationDir, err)
		output.MarkAsFailed(err)
		return
	}

	log.Info("********************************starting configure Docker plugin**************************************")
	switch pluginInput.Action {
	case INSTALL:
		runInstallCommands(p.context, pluginInput, orchestrationDir, output)
	case UNINSTALL:
		runUninstallCommands(p.context, pluginInput, orchestrationDir, output)

	default:
		output.MarkAsFailed(fmt.Errorf("configure Action is set to unsupported value: %v", pluginInput.Action))
	}
	log.Info("********************************completing configure Docker plugin**************************************")
	return
}