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CLI for OpenGist
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package main

import (
	"bytes"
	"errors"
	"flag"
	"fmt"
	"io"
	"os"
	"os/user"
	"path/filepath"
	"regexp"
	"strings"

	"github.com/adrg/xdg"
	"github.com/charmbracelet/huh"
	"github.com/go-git/go-git/v5"
	"github.com/go-git/go-git/v5/config"
	"github.com/go-git/go-git/v5/plumbing/transport/http"
	"github.com/peterbourgon/ff/v3"
	"github.com/peterbourgon/ff/v3/ffyaml"
)

type args struct {
	username     string
	password     string
	passwordFile string
	domain       string
	cli          []string
}

func defaultConfig() string {
	def, err := xdg.ConfigFile("gist/config.yaml")
	if err != nil {
		return "config.yaml"
	}
	return def
}

func defaultUsername() string {
	u, err := user.Current()
	if err != nil {
		return ""
	}
	return u.Username
}

func parseArgs(args []string) (a args, e error) {
	fs := flag.NewFlagSet("gist", flag.ExitOnError)
	fs.String("config", defaultConfig(), "Path to config file")
	fs.StringVar(&a.username, "username", defaultUsername(), "opengist username")
	fs.StringVar(&a.username, "u", a.username, "--username")
	fs.StringVar(&a.password, "password", "", "opengist password")
	fs.StringVar(&a.password, "p", a.password, "--password")
	fs.StringVar(&a.passwordFile, "password-file", "", "Path to a file containing the opengist password")
	fs.StringVar(&a.passwordFile, "f", a.passwordFile, "--password-file")
	fs.StringVar(&a.domain, "domain", "", "opengist domain")
	fs.StringVar(&a.domain, "d", a.domain, "--domain")
	if err := ff.Parse(fs, args,
		ff.WithConfigFileFlag("config"),
		ff.WithAllowMissingConfigFile(true),
		ff.WithConfigFileParser(ffyaml.Parser),
		ff.WithEnvVarPrefix("GIST"),
	); err != nil {
		return a, err
	}
	a.cli = fs.Args()
	return a, nil
}

func copyFile(src, dest string) error {
	fi, err := os.Lstat(src)
	if err != nil {
		return err
	}

	srcFi, err := os.Open(src)
	if err != nil {
		return fmt.Errorf("could not open src: %w", err)
	}
	defer srcFi.Close()

	destFi, err := os.Create(dest)
	if err != nil {
		return fmt.Errorf("could not create dest: %w", err)
	}
	defer destFi.Close()

	if err := os.Chmod(dest, fi.Mode()); err != nil {
		return err
	}

	if _, err := io.Copy(destFi, srcFi); err != nil {
		return fmt.Errorf("could not copy %s to %s: %w", src, dest, err)
	}
	return nil
}

func maine() error {
	args, err := parseArgs(os.Args[1:])
	if err != nil {
		return fmt.Errorf("could not parse args: %w", err)
	}

	required := func(s string) error {
		if strings.TrimSpace(s) == "" {
			return errors.New("value is required")
		}
		return nil
	}

	var prompts []huh.Field
	if args.username == "" {
		prompts = append(prompts,
			huh.NewInput().
				Title("Opengist username").
				Validate(required).
				Value(&args.username),
		)
	}

	if args.password == "" && args.passwordFile == "" {
		prompts = append(prompts,
			huh.NewInput().
				Title("Opengist password").
				Password(true).
				Validate(required).
				Value(&args.password),
		)
	}

	if args.domain == "" {
		prompts = append(prompts,
			huh.NewInput().
				Title("Opengist domain").
				Validate(required).
				Value(&args.domain),
		)
	}

	if len(prompts) > 0 {
		if err := huh.NewForm(huh.NewGroup(prompts...)).
			WithTheme(huh.ThemeCatppuccin()).
			Run(); err != nil {
			return fmt.Errorf("missing fields are required: %w", err)
		}
	}

	if args.passwordFile != "" {
		b, err := os.ReadFile(args.passwordFile)
		if err != nil {
			return fmt.Errorf("could not read opengist password file: %w", err)
		}
		args.password = strings.TrimSpace(string(b))
	}

	tmp, err := os.MkdirTemp(os.TempDir(), "gist*")
	if err != nil {
		return fmt.Errorf("could not make temp dir: %w", err)
	}
	defer func() {
		if err := os.RemoveAll(tmp); err != nil {
			fmt.Printf("could not clean up temp dir at %q: %v\n", tmp, err)
		}
	}()

	repo, err := git.PlainInit(tmp, false)
	if err != nil {
		return fmt.Errorf("could not init git repo: %w", err)
	}
	if err := repo.CreateBranch(&config.Branch{
		Name: "main",
	}); err != nil {
		return fmt.Errorf("could not create main branch: %w", err)
	}
	if _, err := repo.CreateRemote(&config.RemoteConfig{
		Name: "origin",
		URLs: []string{fmt.Sprintf("https://%s/init", args.domain)},
	}); err != nil {
		return fmt.Errorf("could not create origin remote: %w", err)
	}

	for _, fp := range args.cli {
		glob, err := filepath.Glob(fp)
		if err != nil {
			return fmt.Errorf("invalid glob: %w", err)
		}
		for _, g := range glob {
			if err := copyFile(g, filepath.Join(tmp, filepath.Base(g))); err != nil {
				return fmt.Errorf("could not copy file: %w", err)
			}
		}
	}

	tree, err := repo.Worktree()
	if err != nil {
		return fmt.Errorf("could not get git worktree: %w", err)
	}
	if err := tree.AddGlob("."); err != nil {
		return fmt.Errorf("could not add all files to staging area: %w", err)
	}
	if _, err := tree.Commit("gist cli", &git.CommitOptions{}); err != nil {
		return fmt.Errorf("could not commit files: %w", err)
	}
	var buf bytes.Buffer
	if err := repo.Push(&git.PushOptions{
		Auth: &http.BasicAuth{
			Username: args.username,
			Password: args.password,
		},
		Progress: &buf,
	}); err != nil {
		return fmt.Errorf("could not push to remote: %w", err)
	}
	re := regexp.MustCompile(fmt.Sprintf(`https://%s/%s/\w+`, args.domain, args.username))
	u := re.FindString(buf.String())
	// FIXME Progress is currently broken (?) for Push, this can be removed once fixed
	u = fmt.Sprintf("https://%s/all", args.domain)
	if u == "" {
		return errors.New("no gist URL found")
	}
	fmt.Println(u)

	return nil
}

func main() {
	if err := maine(); err != nil {
		fmt.Println(err)
	}
}