package gitpb

// runs git, parses output
// types faster than you can

import (
	"errors"
	"path/filepath"
	"regexp"
	"strconv"
	"strings"
	"unicode"

	"go.wit.com/log"
)

func (repo *Repo) reloadVersions() {
	repo.setMasterVersion()
	repo.setDevelVersion()
	repo.setUserVersion()
	repo.setLastTag()
	repo.setCurrentBranchName()
	repo.setCurrentBranchVersion()
}

func (repo *Repo) setMasterVersion() {
	bname := repo.GetMasterBranchName()
	v, err := repo.gitVersionByName(bname)
	/*
		count := repo.LenGitTags()
		log.Info(repo.GetGoPath(), "tag count", count)
		repo.UpdateGitTags()
		count = repo.LenGitTags()
		log.Info(repo.GetGoPath(), "tag count", count)
	*/

	if err == nil {
		repo.MasterVersion = v
	} else {
		log.Log(GITPBWARN, "gitpb.GitMasterVersion() error:", err)
		repo.MasterVersion = "giterr"
	}
}

func (repo *Repo) setDevelVersion() {
	bname := repo.GetDevelBranchName()
	v, err := repo.gitVersionByName(bname)
	if err == nil {
		repo.DevelVersion = v
	} else {
		log.Log(GITPBWARN, "gitpb.GitDevelVersion() error:", err)
		repo.DevelVersion = "deverr"
	}
}

func (repo *Repo) setUserVersion() {
	bname := repo.GetUserBranchName()
	v, err := repo.gitVersionByName(bname)
	if err == nil {
		repo.UserVersion = v
	} else {
		log.Log(GITPBWARN, "gitpb.GitUserVersion() error:", err)
		repo.UserVersion = "uerr"
	}
}

/*
now tracked in repo.Reload()
func (repo *Repo) GetCurrentBranchName() string {
	r := repo.RunQuiet([]string{"git", "branch", "--show-current"})
	output := strings.Join(r.Stdout, "\n")
	if r.Error != nil {
		log.Log(GITPBWARN, "GetCurrentBranchName() not in a git repo?", r.Error, repo.GetGoPath())
		log.Log(GITPBWARN, "GetCurrentBranchName() output might have worked anyway:", output)
	}
	return strings.TrimSpace(output)
}
*/

// this is used often. probably move everything to this
// returns things like
// v0.2.2
// v0.22.39-1-g2141737
// v0.23-dirty
// mystuff
func (repo *Repo) GetCurrentVersion() string {
	if repo == nil {
		return ""
	}
	bver := repo.GetCurrentBranchVersion()
	if repo.CheckDirty() {
		bver = bver + "-dirty"
	}
	return bver
}

func (repo *Repo) gitDescribeByHash(hash string) (string, error) {
	if hash == "" {
		return "", errors.New("hash was blank")
	}
	r := repo.RunQuiet([]string{"git", "describe", "--tags", "--always", hash})
	out := strings.Join(r.Stdout, "\n")
	if r.Error != nil {
		log.Warn("not in a git repo or bad hash?", r.Error, repo.GetGoPath())
		return out, r.Error
	}
	return out, r.Error
}

// this should get the most recent tag
func (repo *Repo) GetLastTagVersion() string {
	return repo.LastTag
}

func (repo *Repo) DebianReleaseVersion() string {
	lasttag := repo.GetLastTagVersion()
	newv := trimNonNumericFromStart(lasttag)
	if newv == "" {
		newv = "0.0"
		if lasttag != "" {
			newv += "-" + lasttag
		}
	}
	return newv
}

func (repo *Repo) DebianCurrentVersion() string {
	cbversion := repo.GetCurrentBranchVersion()

	newv := trimNonNumericFromStart(cbversion)
	if newv == "" {
		newv = "0.0"
	}
	if repo.CheckDirty() {
		newv += "-dirty"
	}
	return newv
}

func (repo *Repo) gitVersionByName(name string) (string, error) {
	name = strings.TrimSpace(name)

	if name == "" {
		// git will return the current tag
		r := repo.RunQuiet([]string{"git", "describe", "--tags", "--always"})
		output := strings.Join(r.Stdout, "\n")
		if r.Error != nil {
			log.Log(GITPBWARN, "gitDescribeByName() output might have worked anyway:", output)
			log.Log(GITPBWARN, "gitDescribeByName() not in a git repo?", r.Error, repo.GetGoPath())
			return "", r.Error
		}
		return strings.TrimSpace(output), nil
	}
	if !repo.IsBranch(name) {
		// tag does not exist
		log.Log(GITPBWARN, "LocalTagExists()", name, "did not exist")
		return "", errors.New("gitDescribeByName() git fatal: Not a valid object name: " + name)
	}
	cmd := []string{"git", "describe", "--tags", "--always", name}
	result := repo.RunQuiet(cmd)
	output := strings.Join(result.Stdout, "\n")
	if result.Error != nil {
		log.Log(GITPBWARN, "cmd =", cmd)
		log.Log(GITPBWARN, "err =", result.Error)
		log.Log(GITPBWARN, "output (might have worked with error?) =", output)
		log.Log(GITPBWARN, "not in a git repo or bad tag?", repo.GetGoPath())
		return "", result.Error
	}

	return strings.TrimSpace(output), nil
}

// find a branch name
// will find "master" or "devel"
// will also find "v0.1.1"
// or will find "patches-from-foo"
// will return *any* match on any git branch because it doesn't
// matter much here yet
// eventually this will be worked out by forge in some future code that hasn't been made yet
func (repo *Repo) IsBranch(findname string) bool {
	loop := repo.Tags.All()
	for loop.Scan() {
		t := loop.Next()
		// log.Info("LocalTagExists() tag:", t.Refname)

		tagname := t.Refname
		if strings.HasPrefix(tagname, "refs/remotes") {
			continue
		}
		path, filename := filepath.Split(tagname)
		log.Log(GITPB, "gitpb.IsBranch() tag:", path, filename, "from", repo.GetGoPath())
		if filename == findname {
			log.Log(GITPB, "gitpb.IsBranch() found tag:", path, filename, "from", repo.GetGoPath())
			return true
		}
	}
	log.Log(GITPB, "did not find tag:", findname, "in", repo.GetGoPath())
	return false
}

// todo: redo this and above. both are messed up. ignore for now until things are stable
func (repo *Repo) IsLocalBranch(findname string) bool {
	loop := repo.Tags.All()
	for loop.Scan() {
		t := loop.Next()
		// log.Info("LocalTagExists() tag:", t.Refname)

		tagname := t.Refname
		if strings.HasPrefix(tagname, "refs/heads") {
			continue
		}
		path, filename := filepath.Split(tagname)
		log.Log(GITPB, "gitpb.IsBranch() tag:", path, filename, "from", repo.GetGoPath())
		if filename == findname {
			log.Log(GITPB, "gitpb.IsBranch() found tag:", path, filename, "from", repo.GetGoPath())
			return true
		}
	}
	log.Log(GITPB, "did not find tag:", findname, "in", repo.GetGoPath())
	return false
}

func trimNonNumericFromStart(s string) string {
	for i, r := range s {
		if unicode.IsDigit(r) {
			return s[i:]
		}
	}
	return ""
}

func normalizeVersion(s string) string {
	// reg, err := regexp.Compile("[^a-zA-Z0-9]+")
	parts := strings.Split(s, "-")
	if len(parts) == 0 {
		return ""
	}
	reg, err := regexp.Compile("[^0-9.]+")
	if err != nil {
		log.Log(GITPBWARN, "normalizeVersion() regexp.Compile() ERROR =", err)
		return parts[0]
	}
	clean := reg.ReplaceAllString(parts[0], "")
	log.Log(GITPB, "normalizeVersion() s =", clean)
	return clean
}

// golang doesn't seem to really support v0.1 and seems to want v0.1.0
// todo: confirm this
func splitVersion(version string) (a, b, c string) {
	tmp := normalizeVersion(version)
	parts := strings.Split(tmp, ".")
	switch len(parts) {
	case 1:
		return parts[0], "", ""
	case 2:
		return parts[0], parts[1], ""
	default:
		return parts[0], parts[1], parts[2]
	}
}

// changes the target minor. v0.1.3 becomes v0.2.0
func (repo *Repo) IncrementTargetMinor() {
	lasttag := repo.GetLastTag()
	var major, minor, revision string
	major, minor, revision = splitVersion(lasttag)

	olda, _ := strconv.Atoi(major)
	oldb, _ := strconv.Atoi(minor)
	oldc, _ := strconv.Atoi(revision)

	oldb += 1
	oldc = 0

	newa := strconv.Itoa(olda)
	newb := strconv.Itoa(oldb)
	newc := strconv.Itoa(oldc)

	repo.SetTargetVersion("v" + newa + "." + newb + "." + newc)
}

// changes the target revision. v0.1.3 becomes v0.1.4
func (repo *Repo) IncrementTargetRevision() {
	lasttag := repo.GetLastTag()
	var major, minor, revision string
	major, minor, revision = splitVersion(lasttag)

	olda, _ := strconv.Atoi(major)
	oldb, _ := strconv.Atoi(minor)
	oldc, _ := strconv.Atoi(revision)

	oldc += 1

	newa := strconv.Itoa(olda)
	newb := strconv.Itoa(oldb)
	newc := strconv.Itoa(oldc)

	repo.SetTargetVersion("v" + newa + "." + newb + "." + newc)
}