/*
Copyright (c) Edgeless Systems GmbH

SPDX-License-Identifier: AGPL-3.0-only
*/
package cmd

import (
	"fmt"

	"github.com/edgelesssys/constellation/v2/hack/logcollector/fields"
	"github.com/edgelesssys/constellation/v2/hack/logcollector/internal"
	"github.com/spf13/cobra"
)

func newTemplateCmd() *cobra.Command {
	templateCmd := &cobra.Command{
		Use:   "template",
		Short: "Templates filebeat and logstash configurations and prepares them for deployment",
		Long:  `Templates filebeat and logstash configurations and prepares them for deployment by placing them in the specified directory.`,
		RunE:  runTemplate,
	}

	templateCmd.Flags().String("dir", "", "Directory to place the templated configurations in (required)")
	must(templateCmd.MarkFlagRequired("dir"))
	must(templateCmd.MarkFlagDirname("dir"))
	templateCmd.Flags().String("username", "", "OpenSearch username (required)")
	must(templateCmd.MarkFlagRequired("username"))
	templateCmd.Flags().String("password", "", "OpenSearch password (required)")
	must(templateCmd.MarkFlagRequired("password"))
	templateCmd.Flags().Int("port", 5045, "Logstash port")
	templateCmd.Flags().StringToString("fields", nil, "Additional fields for the Logstash pipeline")

	return templateCmd
}

func runTemplate(cmd *cobra.Command, _ []string) error {
	flags, err := parseTemplateFlags(cmd)
	if err != nil {
		return fmt.Errorf("parse template flags: %w", err)
	}

	if err := flags.extraFields.Check(); err != nil {
		return fmt.Errorf("validating extra fields: %w", err)
	}

	logstashPreparer := internal.NewLogstashPreparer(
		flags.extraFields,
		flags.username,
		flags.password,
		flags.port,
	)
	if err := logstashPreparer.Prepare(flags.dir); err != nil {
		return fmt.Errorf("prepare logstash: %w", err)
	}

	filebeatPreparer := internal.NewFilebeatPreparer(
		flags.port,
	)
	if err := filebeatPreparer.Prepare(flags.dir); err != nil {
		return fmt.Errorf("prepare filebeat: %w", err)
	}

	metricbeatPreparer := internal.NewMetricbeatPreparer(
		flags.port,
	)
	if err := metricbeatPreparer.Prepare(flags.dir); err != nil {
		return fmt.Errorf("prepare metricbeat: %w", err)
	}

	return nil
}

func parseTemplateFlags(cmd *cobra.Command) (templateFlags, error) {
	dir, err := cmd.Flags().GetString("dir")
	if err != nil {
		return templateFlags{}, fmt.Errorf("parse dir string: %w", err)
	}

	username, err := cmd.Flags().GetString("username")
	if err != nil {
		return templateFlags{}, fmt.Errorf("parse username string: %w", err)
	}

	password, err := cmd.Flags().GetString("password")
	if err != nil {
		return templateFlags{}, fmt.Errorf("parse password string: %w", err)
	}

	extraFields, err := cmd.Flags().GetStringToString("fields")
	if err != nil {
		return templateFlags{}, fmt.Errorf("parse fields map: %w", err)
	}

	port, err := cmd.Flags().GetInt("port")
	if err != nil {
		return templateFlags{}, fmt.Errorf("parse port int: %w", err)
	}

	return templateFlags{
		dir:         dir,
		username:    username,
		password:    password,
		extraFields: extraFields,
		port:        port,
	}, nil
}

type templateFlags struct {
	dir         string
	username    string
	password    string
	extraFields fields.Fields
	port        int
}

func must(err error) {
	if err != nil {
		panic(err)
	}
}