package main

import (
	_ "embed"
	"flag"
	"fmt"
	"io"
	"log"
	"os"
	"os/exec"
	"os/user"
	"path/filepath"
	"strconv"

	"github.com/BurntSushi/toml"
)

//go:embed buildTime.txt
var buildTime string

//go:embed buildVersion.txt
var buildVersion string

type (
	Setup struct {
		Projects_basedir        string
		Module_basepath         string
		Project_dir_permissions string
		Setup_git               bool
		Create_Remote_Repo      bool
		Remote_User             string
		Remote_Location         string
		Remote_Shortname        string
	}
	ScaffoldSetup struct {
		TestKey string
	}
)

var (
	infoFlag     = flag.Bool("Info", false, "Displays the program build information and exits.")
	infoFlag2    = flag.Bool("i", false, "Displays the program build information and exits.")
	sep          = "/"
	cfg_dir      = ".config/devel/scaffold"
	cfg_filename = "scaffold-cfg.toml"
	setup        ScaffoldSetup
	npsetup      Setup
)

func main() {

	flag.Parse()

	if *infoFlag || *infoFlag2 {
		fmt.Printf("Scaffold version: %s", buildVersion)
		fmt.Printf("Built: %s\n", buildTime)
		os.Exit(0)
	}

	// Get setup
	u, err := user.Current()
	ifFerr("Unable to get current user details", err)
	homeDir := u.HomeDir
	scaffold_cfg_dir := homeDir + sep + cfg_dir
	cfg_file := scaffold_cfg_dir + sep + cfg_filename

	if _, err := os.Stat(scaffold_cfg_dir); err != nil {
		e2 := os.MkdirAll(scaffold_cfg_dir, 0700)
		ifFerr("Unable to create scaffold configuration directory", e2)
	}

	if _, err := os.Stat(cfg_file); err != nil {
		fmt.Println("No scaffold program configuration file found - creating a default file")
		// ok now do it
	} else {
		fmt.Println("found config file")
	}

	_, err = toml.DecodeFile(cfg_file, &setup)
	ifFerr("[Failed] to parse config file", err)

	pts, err := availableProjectTypes(scaffold_cfg_dir)
	ifFerr("Unable to read scaffold config directory contents", err)

	// Handle request
	pc := len(os.Args)
	if pc != 3 {
		fmt.Println(prog_help)
		fmt.Printf("Available project types: %v\n", pts)
		os.Exit(1)
	}

	projType := os.Args[1]
	newProjectName := os.Args[2]

	has := isConfigAvailable(pts, projType)
	if !has {
		fmt.Printf("No configuration found for project type: %s\n", projType)
		os.Exit(1)
	}
	fmt.Printf("Project type found: %t\n", has)

	projectTypeDir := scaffold_cfg_dir + sep + projType
	projectCfgFile := projectTypeDir + sep + "scaffold-" + projType + ".toml"

	_, err = toml.DecodeFile(projectCfgFile, &npsetup)
	ifFerr("Unable to read configuration for requested project type", err)

	//Setup and Ready to begin

	// Permissions are octal (ugo - user, group, other)
	inval, err := strconv.ParseUint(npsetup.Project_dir_permissions, 8, 64)
	if err != nil {
		inval = 0700
	}

	// make new project directory
	newProjDir := homeDir + sep + npsetup.Projects_basedir + sep + newProjectName
	if _, err = os.Stat(newProjDir); os.IsExist(err) {
		log.Fatalf("Project directory already exists -- %s\n", err)
	}

	err = os.MkdirAll(newProjDir, os.FileMode(inval))
	ifFerr("Unable to create new project directory ", err)
	fmt.Printf("created new project directory: %s\n", newProjDir)

	err = os.Chdir(newProjDir)
	ifFerr("Unable to change into new project directory to continue", err)

	// copy contents from projectType/sample

	err = filepath.Walk(projectTypeDir+sep+"sample", func(path string, info os.FileInfo, err error) error {
		if err != nil {
			return err
		}
		if info.IsDir() && path == scaffold_cfg_dir {
			return nil
		}
		if info.IsDir() {
			err = os.MkdirAll(info.Name(), os.FileMode(inval))
			ifFerr("Unable to create sub dir "+info.Name(), err)
		} else {
			src, err := os.Open(path)
			ifFerr("Unable to open file for copying: "+path, err)
			defer src.Close()

			dest, err := os.Create(info.Name())
			ifFerr("Unable to make new file: "+info.Name(), err)
			defer dest.Close()

			_, err = io.Copy(dest, src)
			ifFerr("Unable to copy file: "+info.Name(), err)
		}
		return nil
	})
	if err != nil {
		fmt.Println(err)
	}
	fmt.Println("Project sample skeleton copied")

	// run init commands

	// make mod file
	modpath := npsetup.Module_basepath + sep + newProjectName
	_, err = exec.Command("go", "mod", "init", modpath).Output()
	ifFerr("go mod init failed", err)

	// do a mod tidy to update the mod file
	_, err = exec.Command("go", "mod", "tidy").Output()
	ifFerr("Unable to update the mod file with a tidy", err)
	fmt.Println("Updated go.mod")

	// setup git
	if npsetup.Setup_git {
		// init repo
		_, err = exec.Command("git", "init").Output()
		ifFerr("Unable to initialize git repository", err)

		nifd, err := os.Create(".gitignore")
		ifFerr("Unable to create .gitignore file", err)
		defer nifd.Close()
		gi_content := fmt.Sprintf(gi_template, newProjectName)
		_, err = nifd.WriteString(gi_content)
		ifFerr("Unable to write .gitignore content", err)
		fmt.Println("Wrote .gitignore content")

		// stage files
		_, err = exec.Command("git", "add", ".").Output()
		ifFerr("Unable to stage files prior to first commit", err)

		// first commit
		_, err = exec.Command("git", "commit", "-m", "\"Initial Commit\"").Output()
		ifFerr("Unable to make first commit, are your git config --global user.email and user.name set?", err)
		fmt.Println("Made initial commit to local repository")

		if npsetup.Create_Remote_Repo {
			// create remote repo
			acomm := fmt.Sprintf("cd %s && git init --bare %s.git", npsetup.Remote_Location, newProjectName)
			_, err = exec.Command("ssh", npsetup.Remote_User, acomm).Output()
			ifFerr("Unable to create remote repository", err)
			fmt.Println("Remote repository created")

			// add remote to local repo
			new_remote_repo := npsetup.Remote_User + ":" + npsetup.Remote_Location + "/" + newProjectName + ".git"
			_, err = exec.Command("git", "remote", "add", npsetup.Remote_Shortname, new_remote_repo).Output()
			ifFerr("Unable to set git remote for new repo", err)
			fmt.Println("Added remote repo to git as origin")

			// push initial commit
			// be sure you have set
			// git config --global init.defaultBranch main
			_, err = exec.Command("git", "push", "origin", "main").Output()
			ifFerr("Unable to push initial commit to origin", err)
			fmt.Println("Pushed initial commit to remote")

		}
	}

	fmt.Printf("New %s Project: %s ready\n", projType, newProjectName)
}

// if Fatal err
func ifFerr(msg string, err error) {
	if err != nil {
		log.Fatalf("%s -- %s\n", msg, err)
	}
}

func availableProjectTypes(adir string) ([]string, error) {
	var res []string

	sf, err := os.Open(adir)
	if err != nil {
		return nil, err
	}

	entries, err := sf.ReadDir(0)
	if err != nil {
		return nil, err
	}

	for _, e := range entries {
		if e.IsDir() {
			res = append(res, e.Name())
		}
	}
	return res, nil
}

func isConfigAvailable(types []string, aPType string) bool {
	res := false
	for _, v := range types {
		if v == aPType {
			res = true
			break
		}
	}
	return res
}