package forgepb

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

	"github.com/destel/rill"
	"go.wit.com/lib/cobol"
	"go.wit.com/lib/config"
	"go.wit.com/lib/env"
	"go.wit.com/lib/protobuf/gitpb"
	"go.wit.com/log"
)

func reloadCheck(repo *gitpb.Repo) error {
	if err := repo.ReloadCheck(); err != nil {
		log.Infof("%s reload() says err(%v) change(%s)\n", repo.FullPath, err, repo.StateChange)
		return err
	}
	return nil
}

func (f *Forge) Reload() map[string]*RillStats {
	return f.RillRepos(reloadCheck)
}

func (f *Forge) checkNamespace(fullpath string) (*gitpb.Repo, error) {
	if repo := f.Repos.FindByFullPath(fullpath); repo != nil {
		return nil, nil
	}
	repo, err := gitpb.NewRepo(fullpath)
	if err != nil {
		log.Info(fullpath, err)
		return nil, err
	}
	return repo, err
}

func (f *Forge) RescanRepos() error {
	gopath := env.Get("gopath")
	fullpath := env.FullPath(gopath)
	if env.Verbose() {
		log.Info("RescanRepos() running in", fullpath)
	}
	f.scanRepoDir(fullpath)
	err := f.Save()
	// return errors.New("ScanReposByMode() not implemented yet")
	return err
}

// scans for .git/ directories
func (f *Forge) scanRepoDir(path string) error {
	if path == "" {
		return errors.New("ScanRepoDir() got sent blank dir")
	}
	dirs, err := gitDirectoriesNew(path)
	if err != nil {
		return err
	}

	stats := f.RillRepos(reloadCheck)
	for _, stat := range stats {
		if stat.Err == nil {
			continue
		}
		config.SetChanged("repos", true)
	}

	newcount, err := f.rillScanDirsNew(dirs)
	if err != nil {
		log.Info("go src dir problem. exit for now?", err)
		return err
	}
	if newcount != 0 {
		log.Info("forge go src scan found", newcount, "repos")
		config.SetChanged("repos", true)
	}
	return err
}

// rill is awesome. long live rill
// attempt scan with rill
func (f *Forge) rillScanDirsNew(fullpaths []string) (int, error) {
	// Convert a slice of user IDs into a channel
	ids := rill.FromSlice(fullpaths, nil)

	// Read users from the API.  // Concurrency = 20
	dirs := rill.Map(ids, cobol.Int(env.Get("RillX")), func(id string) (*gitpb.Repo, error) {
		return f.checkNamespace(id)
	})

	var counter int
	// Activate users.  // Concurrency = 10
	err := rill.ForEach(dirs, cobol.Int(env.Get("RillY")), func(repo *gitpb.Repo) error {
		if repo == nil {
			return nil
		}
		repo = f.Repos.Clone(repo)
		f.VerifyBranchNames(repo)
		if f.Config.IsReadOnly(repo.GetGoPath()) {
			repo.ReadOnly = true
		}
		repo.ReloadCheck()
		counter += 1
		return nil
	})

	return counter, err
}

// doesn't enter the directory any further when it finds a .git/
// not stupid like my old version
func gitDirectoriesNew(srcDir string) ([]string, error) {
	if srcDir == "" {
		log.Info("SCANNING DISALBED")
		return nil, errors.New("SCANNING DISALBED")
	}
	var all []string
	var untracked []string
	var dirs []string
	var trip bool
	err := filepath.WalkDir(srcDir, func(path string, d os.DirEntry, err error) error {
		if err != nil {
			// Handle possible errors, like permission issues
			fmt.Fprintf(os.Stderr, "error accessing path %q: %v\n", path, err)
			return err
		}

		if d.IsDir() {
			// log.Info("path is dir", path)
		} else {
			_, fname := filepath.Split(path)
			switch fname {
			case "repos.pb":
			case "gowork.pb":
			case "go.work":
			case "go.work.last":
			case "go.work.sum":
			default:
				// log.Info("WARNING: you have an untracked file outside of any .git repository:", path)
				untracked = append(untracked, path)
				trip = true
				var match bool
				for _, adir := range dirs {
					if strings.HasPrefix(path, adir) {
						match = true
					}
				}
				if match {
					// already have this dir
				} else {
					dirs = append(dirs, path)
				}

			}
			return nil
		}

		gitdir := filepath.Join(path, ".git")
		_, err2 := os.Stat(gitdir)
		if !os.IsNotExist(err2) {
			all = append(all, path)
			return filepath.SkipDir
		}
		return nil
	})
	//
	// probably always leave this here forever
	// this check, along with CheckDirty() makes sure you can safely delete ~/go/src or the go.work directory
	// because everything is either checked in or deleted. An important thing to know!
	if trip {
		log.Info("WARNING:")
		log.Info("WARNING: you have files that are untracked by .git repos here")
		log.Info("WARNING:")
		count := 0
		for _, file := range untracked {
			log.Info("WARNING:", file)
			if count > 7 {
				break
			}
			count += 1
		}
		log.Info("WARNING:")
		log.Printf("WARNING: you have %d untracked files %d paths\n", len(untracked), len(dirs))
		log.Info("WARNING:")
	}
	return all, err
}