package recipe

import (
	"fmt"
	"os"
	"path"
	"strings"

	"coopcloud.tech/abra/pkg/config"
	"coopcloud.tech/abra/pkg/formatter"
	gitPkg "coopcloud.tech/abra/pkg/git"
	"coopcloud.tech/abra/pkg/log"
	"github.com/distribution/reference"
	"github.com/go-git/go-git/v5"
	"github.com/go-git/go-git/v5/plumbing"
)

// Ensure makes sure the recipe exists, is up to date and has the latest version checked out.
func (r Recipe) Ensure(chaos bool, offline bool) error {
	if err := r.EnsureExists(); err != nil {
		return err
	}

	if !chaos {
		if err := r.EnsureIsClean(); err != nil {
			return err
		}
		if !offline {
			if err := r.EnsureUpToDate(); err != nil {
				log.Fatal(err)
			}
		}
		if err := r.EnsureLatest(); err != nil {
			return err
		}
	}
	return nil
}

// EnsureExists ensures that the recipe is locally cloned
func (r Recipe) EnsureExists() error {
	if _, err := os.Stat(r.Dir); os.IsNotExist(err) {
		log.Debugf("%s does not exist, attemmpting to clone", r.Dir)
		if err := gitPkg.Clone(r.Dir, r.GitURL); err != nil {
			return err
		}
	}

	if err := gitPkg.EnsureGitRepo(r.Dir); err != nil {
		return err
	}

	return nil
}

// EnsureVersion checks whether a specific version exists for a recipe.
func (r Recipe) EnsureVersion(version string) (bool, error) {
	isChaosCommit := false

	if err := gitPkg.EnsureGitRepo(r.Dir); err != nil {
		return isChaosCommit, err
	}

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

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

	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 isChaosCommit, err
	}

	joinedTags := strings.Join(parsedTags, ", ")
	if joinedTags != "" {
		log.Debugf("read %s as tags for recipe %s", joinedTags, r.Name)
	}

	var opts *git.CheckoutOptions
	if tagRef.String() == "" {
		log.Debugf("attempting to checkout '%s' as chaos commit", version)

		hash, err := repo.ResolveRevision(plumbing.Revision(version))
		if err != nil {
			log.Fatalf("unable to resolve '%s': %s", version, err)
		}

		opts = &git.CheckoutOptions{Hash: *hash, Create: false, Force: true}
		isChaosCommit = true
	} else {
		opts = &git.CheckoutOptions{Branch: tagRef, Create: false, Force: true}
	}

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

	if err := worktree.Checkout(opts); err != nil {
		return isChaosCommit, nil
	}

	log.Debugf("successfully checked %s out to %s in %s", r.Name, tagRef.Short(), r.Dir)

	return isChaosCommit, nil
}

// EnsureIsClean makes sure that the recipe repository has no unstaged changes.
func (r Recipe) EnsureIsClean() error {
	isClean, err := gitPkg.IsClean(r.Dir)
	if err != nil {
		return fmt.Errorf("unable to check git clean status in %s: %s", r.Dir, err)
	}

	if !isClean {
		msg := "%s (%s) has locally unstaged changes? please commit/remove your changes before proceeding"
		return fmt.Errorf(msg, r.Name, r.Dir)
	}

	return nil
}

// EnsureLatest makes sure the latest commit is checked out for the local recipe repository
func (r Recipe) EnsureLatest() error {
	recipeDir := path.Join(config.RECIPES_DIR, r.Name)

	if err := gitPkg.EnsureGitRepo(recipeDir); err != nil {
		return err
	}

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

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

	branch, err := gitPkg.GetDefaultBranch(repo, recipeDir)
	if err != nil {
		return err
	}

	checkOutOpts := &git.CheckoutOptions{
		Create: false,
		Force:  true,
		Branch: plumbing.ReferenceName(branch),
	}

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

	return nil
}

// EnsureUpToDate ensures that the local repo is synced to the remote
func (r Recipe) EnsureUpToDate() error {
	recipeDir := path.Join(config.RECIPES_DIR, r.Name)

	repo, err := git.PlainOpen(recipeDir)
	if err != nil {
		return fmt.Errorf("unable to open %s: %s", recipeDir, err)
	}

	remotes, err := repo.Remotes()
	if err != nil {
		return fmt.Errorf("unable to read remotes in %s: %s", recipeDir, err)
	}

	if len(remotes) == 0 {
		log.Debugf("cannot ensure %s is up-to-date, no git remotes configured", r.Name)
		return nil
	}

	worktree, err := repo.Worktree()
	if err != nil {
		return fmt.Errorf("unable to open git work tree in %s: %s", recipeDir, err)
	}

	branch, err := gitPkg.CheckoutDefaultBranch(repo, recipeDir)
	if err != nil {
		return fmt.Errorf("unable to check out default branch in %s: %s", recipeDir, err)
	}

	fetchOpts := &git.FetchOptions{Tags: git.AllTags}
	if err := repo.Fetch(fetchOpts); err != nil {
		if !strings.Contains(err.Error(), "already up-to-date") {
			return fmt.Errorf("unable to fetch tags in %s: %s", recipeDir, err)
		}
	}

	opts := &git.PullOptions{
		Force:         true,
		ReferenceName: branch,
		SingleBranch:  true,
	}

	if err := worktree.Pull(opts); err != nil {
		if !strings.Contains(err.Error(), "already up-to-date") {
			return fmt.Errorf("unable to git pull in %s: %s", recipeDir, err)
		}
	}

	log.Debugf("fetched latest git changes for %s", r.Name)

	return nil
}

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

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

	version = formatter.SmallSHA(head.String())

	recipeDir := path.Join(config.RECIPES_DIR, r.Name)
	isClean, err := gitPkg.IsClean(recipeDir)
	if err != nil {
		return version, err
	}

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

	return version, nil
}

// Push pushes the latest changes to a SSH URL remote. You need to have your
// local SSH configuration for git.coopcloud.tech working for this to work
func (r Recipe) Push(dryRun bool) error {
	repo, err := git.PlainOpen(r.Dir)
	if err != nil {
		return err
	}

	if err := gitPkg.CreateRemote(repo, "origin-ssh", r.SSHURL, dryRun); err != nil {
		return err
	}

	if err := gitPkg.Push(r.Dir, "origin-ssh", true, dryRun); err != nil {
		return err
	}

	return nil
}

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

	repo, err := git.PlainOpen(r.Dir)
	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
	}

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

	return tags, nil
}

// GetRecipeVersions retrieves all recipe versions.
func (r Recipe) GetRecipeVersions() (RecipeVersions, error) {
	versions := RecipeVersions{}
	log.Debugf("attempting to open git repository in %s", r.Dir)

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

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

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

	if err := gitTags.ForEach(func(ref *plumbing.Reference) (err error) {
		tag := strings.TrimPrefix(string(ref.Name()), "refs/tags/")

		log.Debugf("processing %s for %s", tag, r.Name)

		checkOutOpts := &git.CheckoutOptions{
			Create: false,
			Force:  true,
			Branch: plumbing.ReferenceName(ref.Name()),
		}
		if err := worktree.Checkout(checkOutOpts); err != nil {
			log.Debugf("failed to check out %s in %s", tag, r.Dir)
			return err
		}

		log.Debugf("successfully checked out %s in %s", ref.Name(), r.Dir)

		config, err := r.GetComposeConfig(nil)
		if err != nil {
			return err
		}

		versionMeta := make(map[string]ServiceMeta)
		for _, service := range config.Services {

			img, err := reference.ParseNormalizedNamed(service.Image)
			if err != nil {
				return err
			}

			path := reference.Path(img)

			path = formatter.StripTagMeta(path)

			var tag string
			switch img.(type) {
			case reference.NamedTagged:
				tag = img.(reference.NamedTagged).Tag()
			case reference.Named:
				log.Warnf("%s service is missing image tag?", path)
				continue
			}

			versionMeta[service.Name] = ServiceMeta{
				Image: path,
				Tag:   tag,
			}
		}

		versions = append(versions, map[string]map[string]ServiceMeta{tag: versionMeta})

		return nil
	}); err != nil {
		return versions, err
	}

	_, err = gitPkg.CheckoutDefaultBranch(repo, r.Dir)
	if err != nil {
		return versions, err
	}

	sortRecipeVersions(versions)

	log.Debugf("collected %s for %s", versions, r.Dir)

	return versions, nil
}