package instance

import (
	"errors"
	"encoding/json"
	"fmt"
	"io/ioutil"
)

// ReadInstance reads an instance's details from a given JSON file.
func ReadInstance(file string) (Instance, error) {
	var err error

	i := defaultInstance()

	data, err := ioutil.ReadFile(file)
	if err != nil {
		return i, fmt.Errorf("unable to read data from %s...\n%v", file, err)
	}

	if err = json.Unmarshal(data, &i); err != nil {
		return i, fmt.Errorf("unable to decode the JSON configuration from %s...\n%v", file, err)
	}

	if len(i.Project) == 0 {
		return i, errors.New("the value for 'project' must not be empty")
	}

	// Propagate the domain to the services as appropriate
	i.Services.Gitea.Domain = i.Domain
	i.Services.Traefik.Domain = i.Domain
	i.Services.Gitea.RootUrl = fmt.Sprintf("https://%s/%s", i.Domain, i.Services.Gitea.BaseUri)
	i.Services.Gitea.SshDomain = i.Domain

	// Propagate the shared Group ID to the serivces as appropriate
	i.Services.Traefik.GroupId = i.SharedGroupId
	i.Services.Gitea.GroupId = i.SharedGroupId

	return i, nil
}

func defaultInstance() Instance {
	c := Instance{
		Project:   "",
		Domain:        "localhost",
		SharedGroupId: 2239,

		Docker: DockerConfig{
			Network: DockerNetworkConfig{
				Name:   "forge-platform-network",
				Subnet: "172.20.0.0/24",
				Driver: "default",
			},
			SharedVolume: DockerSharedVolumeConfig{
				Name:      "forge-platform-shared-volume",
				MountPath: "/forge-platform/shared",
			},
		},

		Services: ServicesConfig{
			Traefik: TraefikConfig{
				CheckNewVersion:    false,
				ContainerIp:        "172.20.0.2",
				LogLevel:           "info",
				SendAnonymousUsage: false,
				Version:            "v2.5.2",
			},
			Gitea: GiteaConfig{
				AppName:                     "Gitea",
				BaseUri:                     "git",
				ContainerIp:                 "172.20.0.3",
				ContainerDataDirectory:      "/forge-platform/data",
				ContainerTemporaryDirectory: "/forge-platform/tmp",
				HostDataDirectory:           "/mnt/forge-platform/gitea",
				HttpPort:                    3000,
				InternalToken:               "",
				LogLevel:                    "info",
				RunMode:                     "prod",
				SecretKey:                   "",
				SshPort:                     2222,
				UserId:                      2000,
				Version:                     "1.50.0",
			},
		},
	}

	return c
}