package recipe

import (
	"fmt"
	"os"
	"path"
	"path/filepath"
	"strings"

	"coopcloud.tech/abra/pkg/compose"
	"coopcloud.tech/abra/pkg/config"
	gitPkg "coopcloud.tech/abra/pkg/git"
	"coopcloud.tech/abra/pkg/upstream/stack"
	loader "coopcloud.tech/abra/pkg/upstream/stack"
	composetypes "github.com/docker/cli/cli/compose/types"
	"github.com/go-git/go-git/v5"
	"github.com/go-git/go-git/v5/plumbing"
	"github.com/sirupsen/logrus"
)

// Recipe represents a recipe.
type Recipe struct {
	Name   string
	Config *composetypes.Config
}

// UpdateLabel updates a recipe label
func (r Recipe) UpdateLabel(serviceName, label string) error {
	pattern := fmt.Sprintf("%s/%s/compose**yml", config.APPS_DIR, r.Name)
	if err := compose.UpdateLabel(pattern, serviceName, label, r.Name); err != nil {
		return err
	}
	return nil
}

// UpdateTag updates a recipe tag
func (r Recipe) UpdateTag(image, tag string) error {
	pattern := fmt.Sprintf("%s/%s/compose**yml", config.APPS_DIR, r.Name)
	if err := compose.UpdateTag(pattern, image, tag, r.Name); err != nil {
		return err
	}
	return nil
}

// Tags list the recipe tags
func (r Recipe) Tags() ([]string, error) {
	var tags []string

	recipeDir := path.Join(config.ABRA_DIR, "apps", r.Name)
	repo, err := git.PlainOpen(recipeDir)
	if err != nil {
		return tags, err
	}

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

	if err := gitTags.ForEach(func(ref *plumbing.Reference) (err error) {
		tags = append(tags, strings.TrimPrefix(string(ref.Name()), "refs/tags/"))
		return nil
	}); err != nil {
		return tags, err
	}

	logrus.Debugf("detected '%s' as tags for recipe '%s'", strings.Join(tags, ", "), r.Name)

	return tags, nil
}

// Get retrieves a recipe.
func Get(recipeName string) (Recipe, error) {
	if err := EnsureExists(recipeName); err != nil {
		return Recipe{}, err
	}

	pattern := fmt.Sprintf("%s/%s/compose**yml", config.APPS_DIR, recipeName)
	composeFiles, err := filepath.Glob(pattern)
	if err != nil {
		return Recipe{}, err
	}

	envSamplePath := path.Join(config.ABRA_DIR, "apps", recipeName, ".env.sample")
	sampleEnv, err := config.ReadEnv(envSamplePath)
	if err != nil {
		logrus.Fatal(err)
	}

	opts := stack.Deploy{Composefiles: composeFiles}
	config, err := loader.LoadComposefile(opts, sampleEnv)
	if err != nil {
		return Recipe{}, err
	}

	return Recipe{Name: recipeName, Config: config}, nil
}

// EnsureExists ensures that a recipe is locally cloned
func EnsureExists(recipe string) error {
	recipeDir := path.Join(config.ABRA_DIR, "apps", strings.ToLower(recipe))

	if _, err := os.Stat(recipeDir); os.IsNotExist(err) {
		logrus.Debugf("%s does not exist, attemmpting to clone", recipeDir)
		url := fmt.Sprintf("%s/%s.git", config.REPOS_BASE_URL, recipe)
		if err := gitPkg.Clone(recipeDir, url); err != nil {
			return err
		}
	}

	return nil
}

// EnsureVersion checks whether a specific version exists for a recipe.
func EnsureVersion(recipeName, version string) error {
	recipeDir := path.Join(config.ABRA_DIR, "apps", recipeName)

	isClean, err := gitPkg.IsClean(recipeName)
	if err != nil {
		return err
	}

	if !isClean {
		return fmt.Errorf("'%s' has locally unstaged changes", recipeName)
	}

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

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

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

	logrus.Debugf("read '%s' as tags for recipe '%s'", strings.Join(parsedTags, ", "), recipeName)

	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,
		Create: false,
		Force:  true,
	}
	if err := worktree.Checkout(opts); err != nil {
		return err
	}

	logrus.Debugf("successfully checked '%s' out to '%s' in '%s'", recipeName, tagRef.Short(), recipeDir)

	return nil
}

// EnsureLatest makes sure the latest commit is checkout on for a local recipe repository.
func EnsureLatest(recipeName string) error {
	recipeDir := path.Join(config.ABRA_DIR, "apps", recipeName)

	isClean, err := gitPkg.IsClean(recipeName)
	if err != nil {
		return err
	}

	if !isClean {
		return fmt.Errorf("'%s' has locally unstaged changes", recipeName)
	}

	logrus.Debugf("attempting to open git repository in '%s'", recipeDir)

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

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

	branch := "master"
	if _, err := repo.Branch("master"); err != nil {
		if _, err := repo.Branch("main"); err != nil {
			logrus.Debugf("failed to select branch in '%s'", path.Join(config.APPS_DIR, recipeName))
			return err
		}
		branch = "main"
	}

	refName := fmt.Sprintf("refs/heads/%s", branch)
	checkOutOpts := &git.CheckoutOptions{
		Create: false,
		Force:  true,
		Branch: plumbing.ReferenceName(refName),
	}

	if err := worktree.Checkout(checkOutOpts); err != nil {
		logrus.Debugf("failed to check out '%s' in '%s'", branch, recipeDir)
		return err
	}

	return nil
}

// ChaosVersion constructs a chaos mode recipe version.
func ChaosVersion(recipeName string) (string, error) {
	var version string

	head, err := gitPkg.GetRecipeHead(recipeName)
	if err != nil {
		return version, err
	}

	version = head.String()[:8]

	isClean, err := gitPkg.IsClean(recipeName)
	if err != nil {
		return version, err
	}

	if !isClean {
		version = fmt.Sprintf("%s + unstaged changes", version)
	}

	return version, nil
}