package garage

import (
	"fmt"
	"io"
	"os"
	"text/template"
)

// GarageTomlData describes all fields needed for rendering a garage.toml
// file via this package's template.
type GarageTomlData struct {
	MetaPath string
	DataPath string

	RPCSecret  string
	AdminToken string

	RPCAddr   string
	S3APIAddr string
	AdminAddr string

	BootstrapPeers []string
}

var garageTomlTpl = template.Must(template.New("").Parse(`

metadata_dir = "{{ .MetaPath }}"
data_dir = "{{ .DataPath }}"

replication_mode = "3"

rpc_secret = "{{ .RPCSecret }}"
rpc_bind_addr = "{{ .RPCAddr }}"
rpc_public_addr = "{{ .RPCAddr }}"

bootstrap_peers = [{{- range .BootstrapPeers }}
"{{ . }}",
{{ end -}}]

[s3_api]
api_bind_addr = "{{ .S3APIAddr }}"
s3_region = "garage"

[admin]
api_bind_addr = "{{ .AdminAddr }}"
admin_token = "{{ .AdminToken }}"

`))

// RenderGarageToml renders a garage.toml using the given data into the writer.
func RenderGarageToml(into io.Writer, data GarageTomlData) error {
	return garageTomlTpl.Execute(into, data)
}

// WriteGarageTomlFile renders a garage.toml using the given data to a new file
// at the given path.
func WriteGarageTomlFile(path string, data GarageTomlData) error {

	file, err := os.OpenFile(
		path, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0640,
	)

	if err != nil {
		return fmt.Errorf("creating file: %w", err)
	}

	defer file.Close()

	if err := garageTomlTpl.Execute(file, data); err != nil {
		return fmt.Errorf("rendering template to file: %w", err)
	}

	return nil
}