package forgepb

import (
	"os"
	"path/filepath"
	"time"

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

var ErrorNotAllReposOnMaster error = log.Errorf("not all repos on are on the master branch")
var ErrorNotAllReposOnDevel error = log.Errorf("not all repos on are on the devel branch")
var ErrorNotAllReposOnUser error = log.Errorf("not all repos on are on the user branch")

func (f *Forge) IsEverythingOnMaster() (int, int, int, error) {
	var total int
	var count int
	var nope int

	// first make sure every repo is on the master branch
	for repo := range f.Repos.IterAll() {
		total += 1
		if repo.GetMasterBranchName() == repo.GetCurrentBranchName() {
			count += 1
		} else {
			nope += 1
		}
	}
	if total != count {
		// log.Info(ErrorNotAllReposOnMaster)
		return total, count, nope, ErrorNotAllReposOnMaster
	}
	return total, count, nope, nil
}

func (f *Forge) IsEverythingOnDevel() (int, int, int, error) {
	var total int
	var count int
	var nope int

	// first make sure every repo is on the master branch
	for repo := range f.Repos.IterAll() {
		total += 1
		if repo.GetDevelBranchName() == repo.GetCurrentBranchName() {
			count += 1
		} else {
			nope += 1
		}
	}
	if total != count {
		return total, count, nope, ErrorNotAllReposOnDevel
	}
	return total, count, nope, nil
}

func (f *Forge) IsEverythingOnUser() (int, int, int, error) {
	var total int
	var count int
	var nope int

	// first make sure every repo is on the master branch
	for repo := range f.Repos.IterAll() {
		total += 1
		if repo.GetCurrentBranchName() == repo.GetUserBranchName() {
			count += 1
		} else {
			nope += 1
		}
	}
	if total != count {
		return total, count, nope, ErrorNotAllReposOnUser
	}
	return total, count, nope, nil
}

// trys to figure out if there is still something to update
func (f *Forge) DoAllCheckoutMaster() error {
	now := time.Now()
	f.RillFuncError(rillCheckoutMaster)
	count := f.RillReload()
	if count != 0 {
		f.ConfigSave()
	}

	total, count, nope, err := f.IsEverythingOnMaster()
	log.Printf("Master branch check. %d total repos. (%d ok) (%d not on master branch) (%s)\n", total, count, nope, shell.FormatDuration(time.Since(now)))
	if err != nil {
		// display all repos not on master
		found := new(gitpb.Repos)
		all := f.Repos.SortByFullPath()
		for all.Scan() {
			repo := all.Next()
			if repo.GetCurrentBranchName() != repo.GetMasterBranchName() {
				found.Append(repo)
			}
		}
		f.PrintHumanTable(found)
		log.Printf("There are %d repos that are NOT on the master branch\n", found.Len())
		return err
	}
	return nil
}

func rillCheckoutMaster(repo *gitpb.Repo) error {
	if repo.IsDirty() {
		// never do dirty repos
		return nil
	}
	// 'giterr' means something is very wrong with this repo
	if repo.GetMasterVersion() == "giterr" {
		repo.CheckoutMaster()
		log.Info("master == giterr. BAD REPO", repo.GetFullPath())
		log.Info("master == giterr. BAD REPO", repo.GetFullPath())
		log.Info("master == giterr. BAD REPO", repo.GetFullPath())
		cmd := []string{"git", "checkout", "main"} // todo: figure out main
		repo.RunVerbose(cmd)
		os.Exit(-1)
		return nil
	}
	if repo.GetCurrentBranchName() == repo.GetMasterBranchName() {
		// repo is already on master
		return nil
	}
	repo.CheckoutMaster()
	return nil
}

func rillCheckoutUser(repo *gitpb.Repo) error {
	if repo.IsDirty() {
		// never do dirty repos
		return nil
	}
	if repo.GetCurrentBranchName() == repo.GetMasterBranchName() {
		// repo is already on devel branch. have to move them there first for now
		// return repo.CheckoutDevel()
	}
	if repo.GetCurrentBranchName() == repo.GetUserBranchName() {
		// repo is already on user branch
		return nil
	}
	if err := repo.CheckoutUser(); err != nil {
		log.Info(repo.GetFullPath(), err)
		return err
	}
	return nil
}

// trys to figure out if there is still something to update
func (f *Forge) DoAllCheckoutUser(force bool) error {
	now := time.Now()

	if force {
		log.Info("going to force create user branches")
		if err := f.makeUserBranches(); err != nil {
			return err
		}
	}

	f.RillFuncError(rillCheckoutUser)
	count := f.RillReload()
	if count != 0 {
		f.ConfigSave()
	}

	total, count, nope, err := f.IsEverythingOnUser()
	log.Printf("User branch check. %d total repos. (%d ok) (%d not on user branch) (%s)\n", total, count, nope, shell.FormatDuration(time.Since(now)))
	if err != nil {
		// display all repos not on user
		found := new(gitpb.Repos)
		all := f.Repos.SortByFullPath()
		for all.Scan() {
			repo := all.Next()
			if repo.GetCurrentBranchName() != repo.GetUserBranchName() {
				found.Append(repo)
			}
		}
		f.PrintHumanTable(found)
		log.Printf("There are %d repos that are NOT on the user branch\n", found.Len())
		return err
	}
	return nil
}

func (f *Forge) makeUserBranches() error {
	all := f.Repos.SortByFullPath()
	for all.Scan() {
		repo := all.Next()
		branch := repo.GetUserBranchName()
		if repo.Exists(filepath.Join(".git/refs/heads", branch)) {
			continue
		}
		if repo.Exists(filepath.Join(".git/refs/remotes/origin", branch)) {
			cmd := []string{"git", "checkout", branch}
			repo.RunVerbose(cmd)
			continue
		}
		cmd := []string{"git", "branch", branch}
		repo.RunVerbose(cmd)
		cmd = []string{"git", "checkout", branch}
		repo.RunVerbose(cmd)
	}
	return nil
}

func testReload(repo *gitpb.Repo) error {
	if !repo.DidRepoChange() {
		return nil
	}
	repo.Reload()
	return log.Errorf("repo changed")
}

func (f *Forge) DoAllCheckoutDevelNew(force bool) error {
	f.makeDevelBranches()

	// first run git checkout
	stats := f.RillFuncError(rillCheckoutDevel)
	for path, stat := range stats {
		dur := stat.End.Sub(stat.Start)
		if dur > 1*time.Second {
			log.Infof("%s git checkout took a long time (%s)\n", path, shell.FormatDuration(dur))
		}
		if stat.Err == nil {
			// there was no error
			continue
		}
		// didn't change to devel
	}

	var counter int
	// recreate the repo protobuf
	stats = f.RillFuncError(testReload)
	for path, stat := range stats {
		dur := stat.End.Sub(stat.Start)
		if dur > 1*time.Second {
			log.Infof("%s # Reload took a long time (%s)\n", path, shell.FormatDuration(dur))
		}
		if stat.Err == nil {
			// repo didn't reload
			continue
		}
		// repo reloaded
		counter += 1
	}
	log.Info("reloaded", counter, "repos")
	f.configSave = true
	return nil
}

// is every repo on the devel branch?
func (f *Forge) DoAllCheckoutDevel(force bool) error {
	now := time.Now()
	if force {
		log.Info("going to force create devel branches")
		f.makeDevelBranches()
	}
	log.Info("going to rill:")
	f.RillFuncError(rillCheckoutDevel)
	count := f.RillReload()
	if count != 0 {
		f.ConfigSave()
	}

	total, count, nope, err := f.IsEverythingOnDevel()
	log.Printf("Devel branch check. %d total repos. (%d ok) (%d not on devel branch) (%s)\n", total, count, nope, shell.FormatDuration(time.Since(now)))
	if err != nil {
		// display all repos not on user
		found := new(gitpb.Repos)
		all := f.Repos.SortByFullPath()
		for all.Scan() {
			repo := all.Next()
			if repo.GetCurrentBranchName() != repo.GetDevelBranchName() {
				found.Append(repo)
			}
		}
		f.PrintHumanTable(found)
		log.Printf("There are %d repos that are NOT on the devel branch\n", found.Len())
		return err
	}
	return nil
}

func (f *Forge) makeDevelBranches() error {
	all := f.Repos.SortByFullPath()
	for all.Scan() {
		repo := all.Next()
		branch := repo.GetDevelBranchName()
		if repo.Exists(filepath.Join(".git/refs/heads", branch)) {
			continue
		}
		if repo.Exists(filepath.Join(".git/refs/remotes/origin", branch)) {
			cmd := []string{"git", "checkout", branch}
			repo.RunVerbose(cmd)
			continue
		}
		cmd := []string{"git", "branch", branch}
		repo.RunVerbose(cmd)
		cmd = []string{"git", "checkout", branch}
		repo.RunVerbose(cmd)
	}
	return nil
}

func rillCheckoutDevel(repo *gitpb.Repo) error {
	if repo.IsDirty() {
		// never do dirty repos
		return nil
	}
	if repo.GetCurrentBranchName() == repo.GetDevelBranchName() {
		// repo is already on devel branch
		return nil
	}
	repo.CheckoutDevel()
	return nil
}