package catalogue

import (
	"encoding/json"
	"fmt"
	"io/ioutil"
	"net/http"
	"os"
	"path"
	"strings"
	"time"

	"coopcloud.tech/abra/config"
	"github.com/go-git/go-git/v5"
	"github.com/go-git/go-git/v5/plumbing"
)

type Image struct {
	Image  string `json:"image"`
	Rating string `json:"rating"`
	Source string `json:"source"`
	URL    string `json:"url"`
}

type Feature struct {
	Backups     string `json:"backups"`
	Email       string `json:"email"`
	Healthcheck string `json:"healthcheck"`
	Image       Image  `json:"image"`
	Status      int    `json:"status"`
	Tests       string `json:"tests"`
}

type Tag = string
type Service = string
type ServiceMeta struct {
	Digest string `json:"digest"`
	Image  string `json:"image"`
	Tag    string `json:"tag"`
}

type App struct {
	Category      string                          `json:"category"`
	DefaultBranch string                          `json:"default_branch"`
	Description   string                          `json:"description"`
	Features      Feature                         `json:"features"`
	Icon          string                          `json:"icon"`
	Name          string                          `json:"name"`
	Repository    string                          `json:"repository"`
	Versions      map[Tag]map[Service]ServiceMeta `json:"versions"`
	Website       string                          `json:"website"`
}

func (a App) EnsureExists() error {
	appDir := path.Join(config.ABRA_DIR, "apps", strings.ToLower(a.Name))
	if _, err := os.Stat(appDir); os.IsNotExist(err) {
		url := fmt.Sprintf("%s/%s.git", config.REPOS_BASE_URL, a.Name)
		_, err := git.PlainClone(appDir, false, &git.CloneOptions{URL: url, Tags: git.AllTags})
		if err != nil {
			return err
		}
	}
	return nil
}

func (a App) EnsureVersion(version string) error {
	appDir := path.Join(config.ABRA_DIR, "apps", strings.ToLower(a.Name))

	repo, err := git.PlainOpen(appDir)
	if err != nil {
		return err
	}

	tags, err := repo.Tags()
	if err != nil {
		return nil
	}

	var tagRef plumbing.ReferenceName
	if err := tags.ForEach(func(ref *plumbing.Reference) (err error) {
		if ref.Name().Short() == version {
			tagRef = ref.Name()
		}
		return nil
	}); err != nil {
		return err
	}

	if tagRef.String() == "" {
		return fmt.Errorf("%s is not available?", version)
	}

	worktree, err := repo.Worktree()
	if err != nil {
		return err
	}

	opts := &git.CheckoutOptions{Branch: tagRef, Keep: true}
	if err := worktree.Checkout(opts); err != nil {
		return err
	}

	return nil
}

type Name = string
type AppsCatalogue map[Name]App

func (a AppsCatalogue) Flatten() []App {
	apps := make([]App, 0, len(a))
	for name := range a {
		apps = append(apps, a[name])
	}
	return apps
}

type ByAppName []App

func (a ByAppName) Len() int      { return len(a) }
func (a ByAppName) Swap(i, j int) { a[i], a[j] = a[j], a[i] }
func (a ByAppName) Less(i, j int) bool {
	return strings.ToLower(a[i].Name) < strings.ToLower(a[j].Name)
}

var AppsCatalogueURL = "https://apps.coopcloud.tech"

func AppsCatalogueFSIsLatest() (bool, error) {
	httpClient := &http.Client{Timeout: 5 * time.Second}
	res, err := httpClient.Head(AppsCatalogueURL)
	if err != nil {
		return false, err
	}

	lastModified := res.Header["Last-Modified"][0]
	parsed, err := time.Parse(time.RFC1123, lastModified)
	if err != nil {
		return false, err
	}
	info, err := os.Stat(config.APPS_JSON)
	if err != nil {
		if os.IsNotExist(err) {
			return false, nil
		}
		return false, err
	}

	localModifiedTime := info.ModTime().Unix()
	remoteModifiedTime := parsed.Unix()

	if localModifiedTime < remoteModifiedTime {
		return false, nil
	}

	return true, nil
}

func ReadAppsCatalogue() (AppsCatalogue, error) {
	apps := make(AppsCatalogue)

	appsFSIsLatest, err := AppsCatalogueFSIsLatest()
	if err != nil {
		return nil, err
	}

	if !appsFSIsLatest {
		if err := ReadAppsCatalogueWeb(&apps); err != nil {
			return nil, err
		}
		return apps, nil
	}

	if err := ReadAppsCatalogueFS(&apps); err != nil {
		return nil, err
	}

	return apps, nil
}

func ReadAppsCatalogueFS(target interface{}) error {
	appsJsonFS, err := ioutil.ReadFile(config.APPS_JSON)
	if err != nil {
		return err
	}
	if err := json.Unmarshal(appsJsonFS, &target); err != nil {
		return err
	}
	return nil
}

func ReadAppsCatalogueWeb(target interface{}) error {
	if err := readJson(AppsCatalogueURL, &target); err != nil {
		return err
	}

	appsJson, err := json.MarshalIndent(target, "", "    ")
	if err != nil {
		return err
	}

	if err := ioutil.WriteFile(config.APPS_JSON, appsJson, 0644); err != nil {
		return err
	}

	return nil
}