package repostatus

import (
	"errors"
	"fmt"
	"os/user"
	"strings"
	"time"
	"unicode/utf8"

	"io/ioutil"

	"go.wit.com/lib/gui/shell"
	"go.wit.com/log"
)

func (rs *RepoStatus) GetCurrentBranchName() string {
	return rs.currentBranch.String()
}

func (rs *RepoStatus) GetCurrentBranchVersion() string {
	return rs.currentVersion.String()
}

func (rs *RepoStatus) LastGitPull() (time.Time, error) {
	return rs.mtime(".git/FETCH_HEAD")
}

func (rs *RepoStatus) Age() time.Duration {
	var t *Tag
	t = rs.NewestTag()

	if t != nil {
		log.Log(REPO, "newest tag:", t.date.String(), t.tag.String(), t.Name())
		return t.Age()
	}

	const gitLayout = "Mon Jan 2 15:04:05 2006 -0700"
	const madeuptime = "Mon Jun 3 15:04:05 2013 -0700"
	tagTime, _ := time.Parse(gitLayout, madeuptime)
	return time.Since(tagTime)
}

var ErrorMissingGitConfig error = errors.New("missing .git/config")
var ErrorGitPullOnLocal error = errors.New("git pull on local only branch")

/*
func (rs *RepoStatus) GitPull() (string, error) {
	currentName := rs.GetCurrentBranchName()
	if rs.IsOnlyLocalTag(currentName) {
		return "", ErrorGitPullOnLocal
	}
	var cmd []string
	cmd = append(cmd, "git", "pull")
	r := rs.Run(cmd)
	output := strings.Join(r.Stdout, "\n")
	if r.Error != nil {
		output = "git error_,,,_a_,,,_b_,,,c"
	}
	if r.Error == nil {
		log.Log(REPOWARN, "git pull ran", rs.Path())
		log.Log(REPOWARN, "git pull output", output)
	} else {
		log.Log(REPOWARN, "git pull error", rs.Path(), r.Error)
	}
	return output, r.Error
}
*/

func (rs *RepoStatus) checkoutBranch(level string, branch string) {
	if rs.CheckDirty() {
		log.Log(REPO, "checkoutBranch() checkDirty() == true for repo", rs.realPath.String(), "looking for branch:", branch)
		return
	}
	out := run(rs.realPath.String(), "git", "checkout "+branch)
	log.Log(REPO, rs.realPath.String(), "git checkout "+branch, "returned", out)

	realname := rs.GetCurrentBranchName()
	realversion := rs.GetCurrentBranchVersion()
	log.Log(REPO, rs.realPath.String(), "realname =", realname, "realversion =", realversion)

	switch level {
	case "master":
		rs.mainBranchVersion.SetValue(realversion)
	case "devel":
		rs.develBranchVersion.SetValue(realversion)
	case "user":
		rs.userBranchVersion.SetValue(realversion)
	default:
	}
}

func (rs *RepoStatus) guessDevelWorkingName() {
	if rs.TagExists("guidevel") {
		rs.develWorkingName.SetValue("guidevel")
		rs.develBranchVersion.SetLabel("guidevel")
		return
	}
	if rs.TagExists("devel") {
		rs.develWorkingName.SetValue("devel")
		rs.develBranchVersion.SetLabel("devel")
		return
	}

	// figure out what to do here
	rs.develWorkingName.SetValue("develFIXME")
	rs.develBranchVersion.SetLabel("develFIXME")
}

func (rs *RepoStatus) setUserWorkingName() {
	usr, _ := user.Current()
	uname := usr.Username
	if rs.TagExists(uname) {
		rs.userWorkingName.SetValue(uname)
		rs.userBranchVersion.SetLabel(uname)
		return
	}
	rs.userWorkingName.SetValue("need to create " + uname)
	rs.userBranchVersion.SetLabel("need to create " + uname)
}

// returns "master", "devel", os.Username, etc
func (rs *RepoStatus) GetMasterBranchName() string {
	name := rs.mainWorkingName.String()
	return name
}
func (rs *RepoStatus) GetDevelBranchName() string {
	name := rs.develWorkingName.String()
	return name
}

func (rs *RepoStatus) GetUserBranchName() string {
	name := rs.userWorkingName.String()
	return name
}

// returns the git versions like "1.3-2-laksdjf" or whatever
func (rs *RepoStatus) GetMasterVersion() string {
	name := rs.mainBranchVersion.String()
	return name
}
func (rs *RepoStatus) GetDevelVersion() string {
	name := rs.develBranchVersion.String()
	return name
}
func (rs *RepoStatus) GetUserVersion() string {
	name := rs.userBranchVersion.String()
	return name
}

func (rs *RepoStatus) setMasterVersion(s string) {
	old := rs.GetMasterVersion()
	if old == s {
		return
	}
	rs.mainBranchVersion.SetValue(s)
	if old == "" {
		return // don't note if there was nothing before
	}
	rs.NoteChange("master branch has been changed from " + old + " to " + s)
}

func (rs *RepoStatus) setDevelVersion(s string) {
	old := rs.GetDevelVersion()
	if old == s {
		return
	}
	if old == "" {
		// don't note nothing
	} else {
		rs.NoteChange("devel branch has been changed from " + old + " to " + s)
	}
	rs.develBranchVersion.SetValue(s)
}

func (rs *RepoStatus) setUserVersion(s string) {
	old := rs.GetUserVersion()
	if old == s {
		return
	}
	if old == "" {
		// don't note nothing
	} else {
		rs.NoteChange("user branch has been changed from " + old + " to " + s)
	}
	rs.userBranchVersion.SetValue(s)
}

func (rs *RepoStatus) GitState() string {
	return rs.gitState.String()
}

func (rs *RepoStatus) CheckGitState() string {
	rs.setState()
	return rs.gitState.String()
}

func (rs *RepoStatus) GetStatus() string {
	return rs.gitState.String()
}

func (rs *RepoStatus) setState() {
	rs.changed = false
	if rs.CheckDirty() {
		log.Log(REPO, "CheckDirty() true")
		rs.gitState.SetText("dirty")
		return
	}
	if rs.GetUserVersion() != rs.GetDevelVersion() {
		rs.gitState.SetText("merge to devel")
		return
	}
	if rs.GetDevelVersion() != rs.GetMasterVersion() {
		rs.gitState.SetText("merge to main")
		return
	}
	if rs.lasttag.String() != rs.GetMasterVersion() {
		rs.gitState.SetText("unchanged")
		return
	}

	if rs.CheckBranches() {
		log.Log(REPO, "Branches are Perfect")
		rs.gitState.SetText("PERFECT")
		return
	}
	log.Log(REPO, rs.String(), "Branches are not Perfect")
	rs.gitState.SetText("unknown branches")
}

// TODO: make this report the error somewhere
// This is supposed to check all the branches to make sure
// the are the same. that was originally what this was for
// now I think it's jsut probably dumb old code that doesn't
// need to be here

// actually, this is to attempt to verify absolutely everything
// is pushed upstream before doing a rm -rf ~/go/src
// TODO: revisit this code in the autotypist later
func (rs *RepoStatus) CheckBranches() bool {
	var hashCheck string
	var perfect bool = true
	all := rs.getBranches()
	path := rs.realPath.String() + "/.git/refs/"
	for _, b := range all {
		parts := strings.Split(b, "/")
		rdir := "heads"
		if len(parts) == 2 {
			rdir = "remotes"
		}
		fullfile := path + "/" + rdir + "/" + b

		// check if the ref name is "HEAD". if so, skip
		runeCount := utf8.RuneCountInString(fullfile)
		// Convert the string to a slice of runes
		runes := []rune(fullfile)
		// Slice the last 4 runes
		lastFour := runes[runeCount-4:]
		if string(lastFour) == "HEAD" {
			log.Log(REPO, "skip HEAD fullfile", fullfile)
			continue
		}

		content, _ := ioutil.ReadFile(fullfile)
		hash := strings.TrimSpace(string(content))
		if hashCheck == "" {
			hashCheck = hash
		}
		var cmd []string
		cmd = append(cmd, "git", "show", "-s", "--format=%ci", hash)
		r := shell.PathRunLog(rs.Path(), cmd, INFO)
		if r.Error != nil {
			log.Log(WARN, "CheckBranches() git show error:", r.Error)
		}
		// git show -s --format=%ci <hash> will give you the time
		// log.Log(REPO, fullfile)
		if hash == hashCheck {
			log.Log(REPO, "notsure why this git show is here", hash)
		} else {
			// log.Log(WARN, rs.String(), hash, output, b)
			// log.Log(WARN, "UNKNOWN BRANCHES IN THIS REPO", cmd)
			rs.versionCmdOutput.SetText("UNKNOWN BRANCHES")
			perfect = false
			// parts := strings.Split(b, "/")
			// log.Warn("git push", parts)
		}
	}
	return perfect
}

/*
// this isn't right
func (rs *RepoStatus) LastTagAge() (time.Time, string) {
	return time.Now(), rs.lasttag.String()
}
*/

func (rs *RepoStatus) GetLastTagVersion() string {
	return rs.lasttag.String()
}

// stores the current branch name
func (rs *RepoStatus) checkCurrentBranchName() string {
	currentname := rs.currentBranch.String()
	out := run(rs.realPath.String(), "git", "branch --show-current")
	if currentname == out {
		// nothing changed
		return currentname
	}
	rs.currentBranch.SetValue(out)
	if currentname == "" {
		return out // don't note if there was nothing before
	}
	rs.NoteChange("current branch has changed from " + currentname + " to " + out)
	return out
}

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

func (rs *RepoStatus) gitDescribeByName(name string) (string, error) {
	name = strings.TrimSpace(name)

	if name == "" {
		// git will return the current tag
		r := shell.PathRunLog(rs.Path(), []string{"git", "describe", "--tags", "--always"}, INFO)
		output := strings.Join(r.Stdout, "\n")
		if r.Error != nil {
			log.Warn("gitDescribeByName() not in a git repo?", r.Error, rs.Path())
		}
		return strings.TrimSpace(output), r.Error
	}
	if !rs.LocalTagExists(name) {
		// tag does not exist
		return "", errors.New("gitDescribeByName() git fatal: Not a valid object name")
	}
	cmd := []string{"git", "describe", "--tags", "--always", name}
	r := shell.PathRunLog(rs.Path(), cmd, INFO)
	output := strings.Join(r.Stdout, "\n")
	if r.Error != nil {
		log.Warn("cmd =", cmd)
		log.Warn("err =", r.Error)
		log.Warn("not in a git repo or bad tag?", rs.Path())
	}

	return strings.TrimSpace(output), r.Error
}

// todo: don't run git every time?
func (rs *RepoStatus) checkCurrentBranchVersion() string {
	out, _ := rs.gitDescribeByName("")
	log.Log(REPO, "checkCurrentBranchVersion()", out)
	rs.currentVersion.SetValue(out)
	return out
}

// this should get the most recent tag
func (rs *RepoStatus) setLastTagVersion() {
	hash := run(rs.realPath.String(), "git", "rev-list --tags --max-count=1")
	log.Log(REPO, "getLastTagVersion()", hash)

	name, _ := rs.gitDescribeByHash(hash)
	rs.lasttag.SetText(name)
	return
}

func (rs *RepoStatus) populateTags() {
	tmp := rs.realPath.String() + "/.git/refs/tags"
	log.Log(REPO, "populateTags() path =", tmp)
	for _, tag := range listFiles(tmp) {
		if rs.tags[tag] == "" {
			log.Log(REPO, "populateTags() Adding new tag", tag)
			// rs.tagsDrop.AddText(tag)
			rs.tags[tag] = "origin"
		}
	}
	// rs.tagsDrop.SetText(rs.lasttagrev)
}

func (rs *RepoStatus) getBranches() []string {
	var all []string
	var heads []string
	var remotes []string
	heads = listFiles(rs.realPath.String() + "/.git/refs/heads")
	remotes = listFiles(rs.realPath.String() + "/.git/refs/remotes")

	all = heads

	all = append(all, remotes...)

	for _, branch := range all {
		log.Log(REPO, "getBranches()", branch)
	}
	return all
}

// returns quickly based on the last time it was checked
func (rs *RepoStatus) IsDirty() bool {
	if rs.dirtyLabel.String() == "no" {
		return false
	}
	return true
}

// return the list of dirty files (but ignores go.mod & go.sum)
func (rs *RepoStatus) DirtyList() []string {
	var all []string
	for _, line := range strings.Split(rs.dirtyList, "\n") {
		line = strings.TrimSpace(line)
		parts := strings.Split(line, " ")
		if len(parts) != 2 {
			continue
		}
		if parts[1] == "go.mod" {
			continue
		}
		if parts[1] == "go.sum" {
			continue
		}
		all = append(all, parts[1])
	}
	return all
}

func (rs *RepoStatus) CheckDirty() bool {
	var start string = rs.dirtyLabel.String()
	cmd := []string{"git", "status", "--porcelain"}
	r := shell.PathRunLog(rs.Path(), cmd, INFO)
	out := strings.Join(r.Stdout, "\n")
	if r.Error != nil {
		log.Warn("CheckDirty() status cmd =", cmd)
		log.Warn("CheckDirty() status out =", out)
		log.Warn("CheckDirty() status err =", r.Error)
		log.Error(r.Error, "CheckDirty() git status error")
		rs.dirtyLabel.SetValue("error")
		if start != "error" {
			rs.NoteChange("git status is in error " + fmt.Sprint(r.Error))
		}
		return true
	}

	rs.dirtyList = out

	// last := out[strings.LastIndex(out, "\n")+1:]
	// if last == "nothing to commit, working tree clean" {

	if len(rs.DirtyList()) == 0 {
		log.Log(REPO, "CheckDirty() no", rs.realPath.String())
		rs.dirtyLabel.SetValue("no")
		if start == "" {
			// don't record a change as this is the initial run
			return false
		}
		if start != "no" {
			log.Log(REPOWARN, "is no longer dirty")
			rs.NoteChange("is no longer dirty")
		}
		return false
	}

	rs.dirtyLabel.SetValue("dirty")
	if start == "" {
		// don't record a change as this is the initial run
		return false
	}
	if start != "dirty" {
		log.Log(REPOWARN, "is now dirty")
		rs.NoteChange("is now dirty")
	}
	return true

}

func (rs *RepoStatus) CheckoutBranch(bname string) bool {
	if rs.CheckDirty() {
		log.Log(REPO, rs.realPath.String(), "is dirty")
		log.Info(bname, "is dirty", rs.Path())
		return false
	}
	if !rs.TagExists(bname) {
		// tag does not exist
		log.Log(REPO, "repo does not have branch", bname, rs.Path())
		return false
	}
	cName := rs.GetCurrentBranchName()
	if cName == bname {
		// already on branch
		return true
	}
	cmd := []string{"git", "checkout", bname}
	r := rs.Run(cmd)
	if r.Error != nil {
		log.Log(REPO, "git checkout error:", r.Error)
		return false
	}
	rs.checkCurrentBranchName()
	rs.checkCurrentBranchVersion()
	return true
}

func (rs *RepoStatus) CheckoutMaster() bool {
	if rs.CheckDirty() {
		log.Log(REPO, rs.realPath.String(), "is dirty")
		return false
	}
	mName := rs.GetMasterBranchName()
	if rs.CheckoutBranch(mName) {
		return true
	}
	return true
}

func (rs *RepoStatus) CheckoutDevel() bool {
	devel := rs.develWorkingName.String()
	// user := rs.userWorkingName.String()
	if devel == "" {
		return false
	}
	if rs.CheckDirty() {
		log.Log(REPO, rs.realPath.String(), "is dirty")
		return false
	}

	log.Log(REPO, "checkoutBranch", devel)
	rs.checkoutBranch("devel", devel)
	// log.Log(REPO, "checkoutBranch", user)
	// rs.checkoutBranch("user", user)
	return true
}

func (rs *RepoStatus) CheckoutUser() bool {
	bName := rs.GetUserBranchName()
	if bName == "" {
		return false
	}
	if rs.CheckDirty() {
		log.Log(REPO, rs.realPath.String(), "is dirty")
		return false
	}
	if !rs.BranchExists(bName) {
		return false
	}
	cmd := []string{"git", "checkout", bName}
	r := rs.Run(cmd)
	if r.Error != nil {
		log.Log(REPO, "git checkout error:", r.Error)
	}

	realname := rs.GetCurrentBranchName()
	realversion := rs.GetCurrentBranchVersion()
	log.Log(REPO, rs.realPath.String(), "realname =", realname, "realversion =", realversion)

	if realname != bName {
		log.Log(REPO, "git checkout failed", rs.realPath.String(), bName, "!=", realname)
		return false
	}
	rs.userBranchVersion.SetValue(realversion)
	return true
}