package gitpb

import (
	"fmt"
	"os"
	"os/user"
	"path/filepath"

	"go.wit.com/log"
)

func (repo *Repo) CheckoutMaster() bool {
	bName := repo.GetMasterBranchName()
	if bName == "giterr" {
		cmd := []string{"git", "checkout", "main"} // todo: figure out main
		repo.RunVerboseOnError(cmd)
		os.Exit(-1)
		// TODO: try to fix this
		if repo.checkoutBranch("main") {
			repo.MasterBranchName = "main"
			return true
		} else {
			cmd := []string{"git", "checkout", "main"} // todo: figure out main
			repo.RunVerboseOnError(cmd)
			return false
		}
	}
	if repo.checkoutBranch(bName) {
		return true
	}
	return false
}

func (repo *Repo) CheckoutDevel() bool {
	bName := repo.GetDevelBranchName()
	if repo.checkoutBranch(bName) {
		repo.DevelBranchName = bName
		return true
		// switch ok
	}
	return false
}

func (repo *Repo) CheckoutUser() error {
	bName := repo.GetUserBranchName()
	if bName == "uerr" {
		usr, _ := user.Current()
		repo.SetUserBranchName(usr.Username)
		bName = usr.Username
		log.Info("gitpb CheckoutUser() somehow got user 'uerr'")
	}

	return repo.createUserBranch(bName)
	/*
		if err != nil {
			log.Info("attempting checkout user error", repo.GetGoPath(), bName, err)
		}
		return err
	*/
}

func (repo *Repo) BranchExists(bName string) bool {
	// fixme after move to protobuf
	return true
}

func (repo *Repo) checkoutBranch(bName string) bool {
	if !repo.BranchExists(bName) {
		return false
	}
	if bName == "" {
		return false
	}
	if repo.CheckDirty() {
		log.Log(INFO, repo.GetFullPath(), "is dirty")
		return false
	}
	cmd := []string{"git", "checkout", bName}
	r := repo.Run(cmd)
	if r.Error != nil {
		log.Log(INFO, "git checkout error:", r.Error)
	}

	realname := repo.GetCurrentBranchName()
	realversion := repo.GetCurrentBranchVersion()
	log.Log(INFO, repo.GetFullPath(), "realname =", realname, "realversion =", realversion)

	if realname != bName {
		log.Log(INFO, "git checkout failed", repo.GetFullPath(), bName, "!=", realname)
		return false
	}
	return true
}

// actually creates a local user branch
func (repo *Repo) createUserBranch(branch string) error {
	if branch == "" {
		// get the username here?
		return fmt.Errorf("gitpb createuserBranch() logic err. git branch name can not be blank")
	}
	if repo.IsDirty() {
		// never change repos on dirty branches
		return fmt.Errorf("repo is dirty")
	}

	if repo.Exists(filepath.Join(".git/refs/heads", branch)) {
		var err error
		// there is already a local user branch
		cmd := []string{"git", "checkout", branch}
		if _, err = repo.RunVerboseOnError(cmd); err == nil {
			return nil
		}
		log.Log(INFO, "git checkout error:", err)
	}

	if repo.Exists(filepath.Join(".git/refs/remote/origin", branch)) {
		var err error
		// there is a remote user branch
		// todo: check other remotes
		cmd := []string{"git", "checkout", branch}
		if _, err = repo.RunVerboseOnError(cmd); err == nil {
			return nil
		}
		log.Log(INFO, "git checkout error:", err)
	}

	if repo.GetCurrentBranchName() != repo.GetDevelBranchName() {
		repo.CheckoutDevel()
	}
	repo.Reload()

	if repo.GetCurrentBranchName() != repo.GetDevelBranchName() {
		log.Info("create user branch will probably fail", repo.GetGoPath())
		// TODO: FIX THIS
		// return fmt.Errorf("repo must be on devel branch %s", repo.GetGoPath())
	}

	// create the branch from devel
	cmd := []string{"git", "branch", branch}
	if _, err := repo.RunVerboseOnError(cmd); err != nil {
		return err
	}
	cmd = []string{"git", "checkout", branch}
	if _, err := repo.RunVerboseOnError(cmd); err != nil {
		return err
	}
	return nil
}