// Copyright 2017-2025 WIT.COM Inc. All rights reserved.
// Use of this source code is governed by the GPL 3.0

package main

import (
	"errors"
	"fmt"
	"path/filepath"

	"go.wit.com/lib/env"
	"go.wit.com/lib/fhelp"
	"go.wit.com/lib/protobuf/gitpb"
	"go.wit.com/log"
)

func doResetRepo(repo *gitpb.Repo) error {
	if repo.GetCurrentBranchName() != repo.GetMasterBranchName() {
		return log.Errorf("not on master branch")
	}
	if repo.IsDirty() {
		return log.Errorf("repo is dirty")
	}

	// when publishing, clean out the details of that if it's still there
	if repo.GetTargetVersion() != "" {
		repo.SetTargetVersion("")
	}

	// try to delete user
	if err := doRepoCleanUser(repo); err != nil {
		return err
	}

	// try to delete devel
	err := doRepoCleanDevel(repo)
	return err
}

// reverts all repos back to the original master branches
// automatically deletes local devel and user branches
func doClean() (string, error) {
	var s string
	var err error
	var allerr error

	if me.forge.IsModeNormal() {
		s := fmt.Sprintf("Reset all (%d) git repos to the original state (non-destructive)?", me.forge.Repos.Len())
		if !fhelp.QuestionUser(s) {
			s, err = doModeMaster()
			allerr = errors.Join(allerr, err)
		}
	}
	me.forge.SetCleaningMode()

	// fix this to work, then delete all the other options for "forge clean'
	if err := me.forge.DoAllCheckoutMaster(); err != nil {
		// badExit(err)
	}
	me.forge.RescanRepos() // looks for new dirs, checks existing repos for changes

	notclean := gitpb.NewRepos()
	all := me.forge.Repos.SortByFullPath()
	for all.Scan() {
		repo := all.Next()
		err := doResetRepo(repo)
		if err != nil {
			newr := notclean.Clone(repo)
			newr.State = fmt.Sprintf("%v", err)
			allerr = errors.Join(allerr, err)
		}
	}

	if notclean.Len() > 0 {
		if env.True("--force") {
			// try to force the issue
			for r := range notclean.IterAll() {
				log.Info("FORCE THE ISSUE", r.FullPath)
			}
		} else {
			log.Info("NOT FORCEING THE ISSUE")
		}
		footer := me.forge.NormalCheckTB(notclean)
		s = fmt.Sprintf("(%d) not clean repos %s", notclean.Len(), footer)
		allerr = errors.Join(allerr, errors.New(s))
		return s, allerr
	}

	return "all repos are clean", nil
}

func doRepoCleanDevel(repo *gitpb.Repo) error {
	if !repo.IsLocalBranch(repo.GetDevelBranchName()) {
		// there is no local branch named 'devel'
		return nil
	}

	if repo.GetCurrentBranchName() != repo.GetMasterBranchName() {
		return log.Errorf("%s not on master branch:", repo.GetFullPath())
	}
	if repo.IsDirty() {
		return log.Errorf("%s is dirty:", repo.GetFullPath())
	}
	if err := justDeleteTheDevelBranchAlready(repo); err != nil {
		log.Info("justDeleteTheDevel() err", repo.Namespace, err)
		return err
	}
	return nil
}

// removes all local user branches
func doRepoCleanUser(repo *gitpb.Repo) error {
	if repo.IsDirty() {
		return nil
	}

	bruser := repo.GetUserBranchName()
	brdevel := repo.GetDevelBranchName()
	brmaster := repo.GetMasterBranchName()

	if repo.IsBranchRemote(bruser) {
		b2, err := repo.CountDiffObjects("refs/heads/"+bruser, "refs/heads/"+brmaster) // should be zero
		if err != nil {
			log.Info(repo.FullPath, "doRepoCleanUser() bad branches")
			return err
		}
		if b2 == 0 {
			log.Info("Local remote branch is safe to delete (is completely in master)", bruser)
			cmd := []string{"git", "branch", "-D", bruser}
			s := log.Sprintf("Run: %v in %s", cmd, repo.FullPath)
			if !argv.Force {
				if fhelp.QuestionUser(s) {
					repo.RunVerbose([]string{"git", "branch", "-D", bruser})
					// repo.RunVerbose([]string{"git", "checkout", bname})
				}
			} else {
				repo.RunVerbose([]string{"git", "branch", "-D", bruser})
			}
		}
		log.Info("forge is designed to always have local only user branches", bruser)
		return fmt.Errorf("forge is designed to always have local only user branches")
	}

	if !repo.IsLocalBranch(bruser) {
		// there is no local user branch
		return nil
	}

	// will you loose work if you delete your user branch?
	// if DevelBranchExists()
	//	then if UserBranchCommits exist in DevelBranch
	//		DeleteUserBranch is safe
	if repo.IsLocalBranch(brdevel) {
		b1, err := repo.CountDiffObjects(bruser, "refs/heads/"+brdevel) // should be zero
		if err != nil {
			log.Info(repo.FullPath, "doRepoCleanUser() bad branches")
			return err
		}
		if b1 == 0 {
			// every user branch exists in devel. delete user branch
			cmd := []string{"git", "branch", "-D", bruser}
			// log.Info("USER IS IN DEVEL", repo.Namespace, cmd)
			_, err := repo.RunVerboseOnError(cmd)
			return err
		}
	}

	// will you loose work if you delete your user branch?
	// if master branch exists()
	//	then if all user commits exist in master
	//		delete user branch is safe
	if repo.IsLocalBranch(brmaster) {
		b1, err := repo.CountDiffObjects(bruser, "refs/heads/"+brmaster) // should be zero
		if err != nil {
			log.Info(repo.FullPath, "doRepoCleanUser() bad branches")
			return err
		}
		if b1 == 0 {
			cmd := []string{"git", "branch", "-D", bruser}
			// log.Info("USER IS IN DEVEL", repo.Namespace, cmd)
			_, err := repo.RunVerboseOnError(cmd)
			return err
		}
	}

	return ErrorBranchUnique
}

var ErrorBranchUnique error = errors.New("branch has unique commits")

// if you call this, there is no going back. no checks anymore. nothing
// it deletes the 'devel' branch. git branch -D "devel". END OF STORY
func justDeleteTheDevelBranchAlready(repo *gitpb.Repo) error {
	branch := repo.GetDevelBranchName()
	remote := filepath.Join("origin", branch)

	if me.forge.Config.IsReadOnly(repo.Namespace) {
		if repo.IsDevelRemote() {
			// just make sure the remote & local branches are the same
			return repo.DeleteLocalDevelBranch()
		}
	}

	// check against remote if it exists
	if repo.IsDevelRemote() {
		b1, err := repo.CountDiffObjects(branch, remote) // should be zero
		if err != nil {
			log.Info(repo.FullPath, "doRepoCleanUser() bad branches")
			return err
		}
		if b1 == 0 {
			cmd := []string{"git", "branch", "-D", repo.GetDevelBranchName()}
			// log.Info("DEVEL IS IN REMOTE", repo.Namespace, cmd)
			_, err := repo.RunVerboseOnError(cmd)
			return err
		}
		cmd := []string{"git", "push"}
		log.Info("DEVEL LOCAL NEEDS GIT PUSH TO REMOTE", repo.Namespace, cmd)
		err = repo.RunVerbose(cmd)
		return err
	}

	// remote doesn't exist, check against master
	master := repo.GetMasterBranchName()
	b1, err := repo.CountDiffObjects(branch, "refs/heads/"+master) // should be zero
	if err != nil {
		log.Info(repo.FullPath, "doRepoCleanUser() bad branches")
		return err
	}
	if b1 == 0 {
		cmd := []string{"git", "branch", "-D", repo.GetDevelBranchName()}
		// log.Info("DEVEL IS IN REMOTE", repo.Namespace, cmd)
		_, err := repo.RunVerboseOnError(cmd)
		return err
	}
	cmd := []string{"git", "merge something somehow"}
	log.Info("devel local, remote and master branches are wrong", repo.Namespace, cmd, b1)
	// _, err := repo.RunVerbose(cmd)
	return nil
}

func doGitReset() {
	all := me.forge.Repos.SortByFullPath()
	for all.Scan() {
		repo := all.Next()
		if me.forge.Config.IsReadOnly(repo.Namespace) {
			// log.Info("is readonly", repo.Namespace)
			if repo.CheckDirty() {
				log.Info("is readonly and dirty", repo.Namespace)
				cmd := []string{"git", "reset", "--hard"}
				repo.RunRealtime(cmd)
			}
		} else {
			// log.Info("is not readonly", repo.Namespace)
		}
	}
}

func checkRemoteBranches(repo *gitpb.Repo) error {
	if err := repo.ReloadCheck(); err != nil {
		log.Info("need to reload", repo.FullPath)
	}
	if repo.VerifyRemoteAndLocalBranches(repo.GetDevelBranchName()) {
	} else {
		return log.Errorf("remote devel is out of sync with local: todo: git pull or git fetch")
	}
	if repo.VerifyRemoteAndLocalBranches(repo.GetMasterBranchName()) {
	} else {
		return log.Errorf("remote master is out of sync with local: todo: git pull or git fetch")
	}
	return nil
}

func checkPatchIds(repo *gitpb.Repo, b1 string, b2 string) error {
	var safe bool = true
	var baderr error
	ids := make(map[string]string)
	s1 := fmt.Sprintf("%s..%s", b1, b2)
	s2 := fmt.Sprintf("%s..%s", b2, b1)
	if stats, err := repo.RunStrict([]string{"git", "rev-list", s1}); err != nil {
		return err
	} else {
		for _, hash := range stats.Stdout {
			patchId, err := repo.FindPatchIdByHash(hash)
			if err != nil {
				baderr = err
				safe = false
				continue
			}
			ids[patchId] = hash
		}
	}

	if stats, err := repo.RunStrict([]string{"git", "rev-list", s2}); err != nil {
		return err
	} else {
		for _, hash := range stats.Stdout {
			patchId, err := repo.FindPatchIdByHash(hash)
			if err != nil {
				baderr = err
				safe = false
				continue
			}
			if val, ok := ids[patchId]; ok {
				log.Info(patchId, hash, "already here as", val)
			} else {
				log.Info(hash, "this probably means this branch is not safe to delete")
				safe = false
				ids[patchId] = hash
			}
		}
	}
	for key, val := range ids {
		log.Info(key, val)
	}

	if safe {
		log.Info("branch is probably safe to delete", b1, b2)
	} else {
		log.Info("branch is probably not safe to delete", b1, b2, baderr)
	}
	return baderr
}