package gitpb

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

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

	"go.wit.com/log"
)

func (repo *Repo) GetLastTag() string {
	cmd := []string{"git", "rev-list", "--tags", "--max-count=1"}
	result := repo.RunQuiet(cmd)
	// log.Info("getLastTagVersion()", result.Stdout)

	if len(result.Stdout) != 1 {
		log.Log(GITPBWARN, "git LastTag() error:", result.Stdout)
		return ""
	}

	hash := result.Stdout[0]

	cmd = []string{"git", "describe", "--tags", "--always", hash}
	result = repo.RunQuiet(cmd)

	if len(result.Stdout) != 1 {
		log.Log(GITPBWARN, "git LastTag() error:", result.Stdout)
		return ""
	}

	return result.Stdout[0]
}

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

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

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

func (repo *Repo) GitUserVersion() string {
	bname := repo.GetUserBranchName()
	v, err := repo.gitVersionByName(bname)
	if err == nil {
		return v
	} else {
		log.Log(GITPBWARN, "gitpb.GitUserVersion() error:", err)
		return ""
	}
}
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.GoPath)
		log.Log(GITPBWARN, "GetCurrentBranchName() output might have worked anyway:", output)
	}
	return strings.TrimSpace(output)
}

func (repo *Repo) GetCurrentBranchVersion() string {
	r := repo.RunQuiet([]string{"git", "describe", "--tags", "--always"})
	output := strings.Join(r.Stdout, "\n")
	if r.Error != nil {
		log.Log(GITPBWARN, "GetCurrentBranchVersion() not in a git repo?", r.Error, repo.GoPath)
		log.Log(GITPBWARN, "GetCurrentBranchVersion() output might have worked anyway:", output)
	}
	return strings.TrimSpace(output)
}

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.GoPath)
		return out, r.Error
	}
	return out, r.Error
}

// this should get the most recent tag
func (repo *Repo) GetLastTagVersion() string {
	r := repo.RunQuiet([]string{"git", "rev-list", "--tags", "--max-count=1"})
	hash := strings.Join(r.Stdout, "\n")
	hash = strings.TrimSpace(hash)
	log.Log(GITPB, "getLastTagVersion()", hash)

	name, _ := repo.gitDescribeByHash(hash)
	return name
}

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.GoPath)
			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.GoPath)
		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.GoPath)
		if filename == findname {
			log.Log(GITPB, "gitpb.IsBranch() found tag:", path, filename, "from", repo.GoPath)
			return true
		}
	}
	log.Log(GITPB, "did not find tag:", findname, "in", repo.GoPath)
	return false
}

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