// 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"
	"os"
	"path/filepath"
	"strings"

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

func doGitCreate(namespace string) (string, error) {
	var s string
	var err error
	templateDir := "/var/lib/git/lib/templates/golib"
	if !shell.IsDir(templateDir) {
		return "", errors.New("no template/golib")
	}
	fullpath := filepath.Join("/var/lib/git", namespace)
	if shell.IsDir(fullpath) {
		return "", errors.New("dir " + fullpath + " already exists")
	}
	basepath, _ := filepath.Split(fullpath)
	if err := os.MkdirAll(basepath, os.ModePerm); err != nil {
		return "", err
	}
	cmd := []string{"cp", "-a", templateDir, fullpath}
	shell.RunVerbose(cmd)
	return s, err
}

func doGit() (string, error) {
	var s string
	var err error

	if argv.Git.Log != nil {
		fstr := "--format=\"%h %>(24)%ar %>(20)%an  %s"
		cmd := []string{"git", "log", fstr}
		shell.RunVerbose(cmd)
		s = "git log"
	}

	if argv.Git.Create != "" {
		s = "attmepting to create new repo"
	}

	if argv.Git.Tag != nil {
		cmd := []string{"git", "for-each-ref", "--sort=taggerdate", "--format"}
		cmd = append(cmd, "%(tag)%00%(taggerdate:raw)%00%(taggername)%00%(subject)")
		cmd = append(cmd, "refs/tags")
		result := shell.RunQuiet(cmd)
		for i, line := range result.Stdout {
			parts := strings.Split(line, "\x00")
			log.Infof("LINE: %d len(%d) %v\n", i, len(parts), parts)
		}
		s = "git tags"
	}

	if argv.Git.Who != nil {
		if _, err := fhelp.CheckCmd("git-who"); err != nil {
			if fhelp.QuestionUser("install git-who") {
				log.Info("go install -v -x github.com/sinclairtarget/git-who@latest")
			} else {
				log.Info("not installing")
			}
			me.sh.GoodExit("git who should be installed")
		}
		cmd := []string{"git", "who"}
		shell.RunVerbose(cmd)
		s = "git who"
	}

	if argv.Git.Pull != nil {
		doPull(".config/wit")
		doPull("tools")
		s = "git pull"
	}

	if argv.Git.Push != nil {
		doPush(".config/wit")
		doPush("tools")
		s = "git push"
	}

	if argv.Git.DeleteUntracked {
		initForge()
		var totals, repos int
		for repo := range me.forge.Repos.IterAll() {
			if !strings.HasPrefix(repo.Namespace, "go.wit.com") {
				continue
			}
			files, _ := repo.GitDeleteOthers()
			if len(files) == 0 {
				continue
			}
			totals += len(files)
			repos += 1
			log.Info(len(files), repo.Namespace)
			log.Info(strings.Join(files, "\n"))
			if argv.Force {
				if len(files) > 0 {
					cmd := []string{"rm"}
					cmd = append(cmd, files...)
					_, err := fhelp.RunRealtimeError(cmd)
					if err != nil {
						log.Info("cmd failed", cmd, repo.FullPath, err)
						return "rm failed", err
					}
				}
			}
		}
		s = log.Sprintf("total files to delete: (%d) in (%d) repos", totals, repos)
	}

	return s, err
}

func findRepo(wpath string) (*gitpb.Repo, bool) {
	d := filepath.Join(me.homedir, wpath)
	if !shell.IsDir(d) {
		return nil, false
	}
	repo, err := gitpb.NewRepo(d)
	if err != nil {
		log.Info("path error", d, err)
		return nil, false
	}
	return repo, true
}

func doPull(wpath string) {
	repo, ok := findRepo(wpath)
	if !ok {
		return
	}
	os.Chdir(repo.FullPath)
	cmd := []string{"git", "pull"}
	log.Info("Run", repo.FullPath, cmd)
	exitOnErrorRealtime(cmd)
}

func doPush(wpath string) {
	doPull(wpath)
	d := filepath.Join(me.homedir, wpath)
	if !shell.IsDir(d) {
		return
	}
	repo, err := gitpb.NewRepo(d)
	if err != nil {
		log.Info("path error", d, err)
		return
	}
	if repo == nil {
		log.Info("repo is nil", d, err)
		return
	}

	if err := repo.GitCommit(); err != nil {
		msg := fmt.Sprintf("repo.GitCommit() %s", repo.FullPath)
		me.sh.BadExit(msg, err)
	}

	repo.RunRealtime([]string{"git", "push"})
}

/*
  ┌─────────────┬───────────────────────────┬──────────────────────────────────────────┐
  │ Placeholder │ Description               │ Example Output                           │
  ├─────────────┼───────────────────────────┼──────────────────────────────────────────┤
  │ %H          │ Full commit hash          │ a1b2c3d4e5f6a1b2c3d4e5f6a1b2c3d4e5f6a1b2 │
  │ %h          │ Abbreviated commit hash   │ a1b2c3d                                  │
  │ %T          │ Full tree hash            │ f1e2d3c4b5a6f1e2d3c4b5a6f1e2d3c4b5a6f1e2 │
  │ %t          │ Abbreviated tree hash     │ f1e2d3c                                  │
  │ %P          │ Full parent hashes        │ a1b2... f1e2... (space-separated)        │
  │ %p          │ Abbreviated parent hashes │ a1b2c3d f1e2d3c                          │
  └─────────────┴───────────────────────────┴──────────────────────────────────────────┘


  Author and Committer Information

  (Note: "Author" is who originally wrote the code. "Committer" is who last applied it to the branch. They are often the
  same.)


  ┌─────────────┬───────────────────────────────────┬────────────────────────────────┐
  │ Placeholder │ Description                       │ Example Output                 │
  ├─────────────┼───────────────────────────────────┼────────────────────────────────┤
  │ %an         │ Author name                       │ Jane Doe                       │
  │ %ae         │ Author email                      │ jane.doe@example.com           │
  │ %aN         │ Author name (respecting .mailmap) │ Jane Doe                       │
  │ %ad         │ Author date                       │ Tue Oct 14 10:30:00 2025 -0700 │
  │ %ar         │ Author date, relative             │ 3 days ago                     │
  │ %at         │ Author date, UNIX timestamp       │ 1760453400                     │
  │ %cn         │ Committer name                    │ John Smith                     │
  │ %ce         │ Committer email                   │ john.smith@example.com         │
  │ %cd         │ Committer date                    │ Wed Oct 15 11:00:00 2025 -0700 │
  │ %cr         │ Committer date, relative          │ 2 days ago                     │
  │ %ct         │ Committer date, UNIX timestamp    │ 1760541600                     │
  └─────────────┴───────────────────────────────────┴────────────────────────────────┘

  Commit Message


  ┌─────────────┬──────────────────────────────────────────────────────────┐
  │ Placeholder │ Description                                              │
  ├─────────────┼──────────────────────────────────────────────────────────┤
  │ %s          │ Subject (first line of the commit message)               │
  │ %f          │ "Sanitized" subject line, suitable for a filename        │
  │ %b          │ Body (the rest of the commit message, after the subject) │
  │ %B          │ Raw full commit message (subject + body)                 │
  │ %N          │ Commit notes (from git notes)                            │
  └─────────────┴──────────────────────────────────────────────────────────┘

  Ref Names (Branches and Tags)


  ┌────────────┬─────────────────────────────────────────────────────────────┬──────────────────────────────────────┐
  │ Placeho... │ Description                                                 │ Example Output                       │
  ├────────────┼─────────────────────────────────────────────────────────────┼──────────────────────────────────────┤
  │ %d         │ All ref names pointing to this commit                       │ `(HEAD -> main, tag: v1.0, origin... │
  │ %D         │ Like %d, but without the parentheses/commas                 │ HEAD -> main, tag: v1.0, origin/main │
  │ %S         │ The ref name given on the command line (e.g., the branch... │ main                                 │
  └────────────┴─────────────────────────────────────────────────────────────┴──────────────────────────────────────┘

*/