package repostatus

import (
	"errors"
	"io/ioutil"
	"net/http"
	"os"
	"path/filepath"
	"strings"

	"go.wit.com/lib/gadgets"
	"go.wit.com/lib/gui/shell"
	"go.wit.com/log"
)

var windowMap map[string]*RepoStatus

func init() {
	windowMap = make(map[string]*RepoStatus)
}

// deprecate this
func ListAllOld() {
	for path, rs := range windowMap {
		log.Warn(rs.GetMasterVersion(), path)
	}
}

// returns the object for the path
// deprecate this
func FindPathOld(path string) *RepoStatus {
	if windowMap[path] == nil {
		log.Log(INFO, "FindPath() not initialized yet", path)
		return nil
	}
	return windowMap[path]
}

// makes a window of the status of the repo
// don't worry, you can think of it like Sierpinski carpet
// it's doesn't need to be displayed so it'll work fine even in an embedded space
func New(path string) (*RepoStatus, error) {
	err, r := NewRepoStatusWindow(path)
	return r, err
}

func SetWorkPath(path string) {
	os.Setenv("REPO_WORK_PATH", path)
}

// guess the paths. returns
// realpath : the actual path on the filesystem
// goSrcPath : this could be ~/go/src, or where the go.work file is
// goPath : go.wit.com/lib/gui/repostatus (for example)
// true/false if the repo is a golang repo
func guessPaths(path string) (string, string, string, bool, error) {
	var realpath, goSrcDir string
	var isGoLang bool = false

	homeDir, err := os.UserHomeDir()
	if err != nil {
		log.Log(WARN, "Error getting home directory:", err)
		return path, realpath, goSrcDir, false, err
	}
	goSrcDir = filepath.Join(homeDir, "go/src")

	// allow arbitrary paths, otherwise, assume the repo is in ~/go/src
	// unless REPO_WORK_PATH was set. to over-ride ~/go/src
	// todo, look for go.work
	if os.Getenv("REPO_WORK_PATH") == "" {
		os.Setenv("REPO_WORK_PATH", goSrcDir)
	} else {
		goSrcDir = os.Getenv("REPO_WORK_PATH")
	}

	if strings.HasPrefix(path, "/") {
		realpath = path
	} else if strings.HasPrefix(path, "~") {
		tmp := strings.TrimPrefix(path, "~")
		realpath = filepath.Join(homeDir, tmp)
	} else {
		realpath = filepath.Join(goSrcDir, path)
		isGoLang = true
	}

	if os.Getenv("REPO_AUTO_CLONE") == "true" {
		err := Clone(goSrcDir, path)
		if err != nil {
			// directory doesn't exist. exit with nil and error nil
			return path, realpath, goSrcDir, false, errors.New("git clone")
		}
	}

	if !IsDirectory(realpath) {
		log.Log(REPOWARN, "directory doesn't exist", realpath)
		// directory doesn't exist. exit with nil and error nil
		return path, realpath, goSrcDir, false, errors.New(realpath + " does not exist")
	}

	filename := filepath.Join(realpath, ".git/config")

	_, err = os.Open(filename)
	if err != nil {
		// log.Log(WARN, "Error reading .git/config:", filename, err)
		// log.Log(WARN, "TODO: find .git/config in parent directory")
		return path, realpath, goSrcDir, false, err
	}
	return path, realpath, goSrcDir, isGoLang, nil
}

// attempt to git clone if the go path doesn't exist
func Clone(wdir string, path string) error {
	fullpath := filepath.Join(wdir, path)
	if IsDirectory(fullpath) {
		// directory already exists
		return nil
	}
	err := os.Chdir(wdir)
	if err != nil {
		return err
	}

	fulldir := filepath.Join(wdir, filepath.Dir(path))
	base := filepath.Base(path)
	os.MkdirAll(fulldir, 0750)
	err = os.Chdir(fulldir)
	if err != nil {
		return err
	}
	switch path {
	case "golang.org/x/crypto":
		path = "go.googlesource.com/crypto"
	case "golang.org/x/mod":
		path = "go.googlesource.com/mod"
	case "golang.org/x/net":
		path = "go.googlesource.com/net"
	case "golang.org/x/sys":
		path = "go.googlesource.com/sys"
	case "golang.org/x/sync":
		path = "go.googlesource.com/sync"
	case "golang.org/x/term":
		path = "go.googlesource.com/term"
	case "golang.org/x/text":
		path = "go.googlesource.com/text"
	case "golang.org/x/tools":
		path = "go.googlesource.com/tools"
	case "golang.org/x/xerrors":
		path = "go.googlesource.com/xerrors"
	}

	shell.RunPath(fulldir, []string{"git", "clone", "http://" + path})
	if IsDirectory(fullpath) {
		// clone worked
		return nil
	}
	var url string
	// TODO: attempt to work around things like:
	// go get golang.org/x/term
	// is now supposed to be:
	// git clone https://go.googlesource.com/term
	// if url, err = findGoImport("http://" + path); err != nil {
	if path == "golang.org/x/term" {
		log.Warn("IMPLEMENT git clone hack here. path =", path)
		log.Warn("IMPLEMENT git clone hack here. path =", path)
		path = "go.googlesource.com/term"
		log.Warn("IMPLEMENT git clone hack here. new path =", path)
		log.Warn("IMPLEMENT git clone hack here. new path =", path)
		shell.RunPath(fulldir, []string{"git", "clone", "http://" + path})
		if IsDirectory(fullpath) {
			// clone worked
			return nil
		}
	}

	// this creates a valid URL for git clone
	if url, err = runGoList(path); err != nil {
		return err
	}
	log.Info("URL:", url)
	shell.RunPath(fulldir, []string{"git", "clone", url, base})
	if IsDirectory(fullpath) {
		// clone worked
		return nil
	}
	return errors.New("resolve go import")
}

// this is a terrible hack and really
// shouldn't be here. Hopefully this can
// be removed and the GO compiler code can
// be involked directly (it appears to currently
// be an internal/ function in the GO sources
// so it can't be imported from outside the compiler
func findGoImport(url string) (string, error) {
	resp, err := http.Get(url)
	if err != nil {
		return "", err
	}
	defer resp.Body.Close()

	bodyBytes, err := ioutil.ReadAll(resp.Body)
	if err != nil {
		return "", err
	}

	tmp := string(bodyBytes)
	parts := strings.Split(tmp, "go-import")
	if len(parts) < 2 {
		return "", errors.New("missing go-import")
	}
	// this is terrible, it doesn't even look for 'content='
	// but again, this is just a hack for my own code to be
	// usuable after the removal in go v1.22 of the go get clone behavior that was in v1.21
	parts = strings.Split(parts[1], "\"")
	var newurl string
	for {
		if len(parts) == 0 {
			break
		}
		tmp := strings.TrimSpace(parts[0])
		fields := strings.Split(tmp, " ")
		// log.Info("FIELDS:", fields)
		if len(fields) == 3 {
			newurl = fields[2]
			break
		}
		parts = parts[1:]
	}
	if newurl == "" {
		return "", errors.New("missing git content string")
	}

	return newurl, nil
}

func NewRepoStatusWindow(path string) (error, *RepoStatus) {
	path, realpath, goSrcDir, isGoLang, err := guessPaths(path)
	if err != nil {
		return err, nil
	}

	if windowMap[path] == nil {
		log.Log(INFO, "NewRepoStatusWindow() adding new", path)
	} else {
		log.Warn("This already exists for path", path)
		log.Warn("should return windowMap[path] here")
		return nil, windowMap[path]
	}

	rs := &RepoStatus{
		ready: false,
	}

	rs.tags = make(map[string]string)
	rs.window = gadgets.RawBasicWindow("GO Repo Details " + path)
	rs.window.Horizontal()
	rs.window.Make()
	basebox := rs.window.Box()
	group := basebox.NewGroup("stuff")
	primarybox := group.Box()
	primarybox.Horizontal()
	box2 := group.Box()
	rs.ready = true
	rs.window.Custom = func() {
		rs.Hide()
		log.Warn("repostatus user closed the window()")
	}

	// display the status of the git repository
	rs.drawGitStatus(primarybox)

	// display the git branches and options
	rs.makeBranchesBox(primarybox)

	// show standard git commit and merge controls
	rs.drawGitCommands(primarybox)

	// save ~/go/src & the whole path strings
	rs.path.SetValue(path)
	rs.goSrcPath.SetValue(goSrcDir)
	rs.realPath.SetValue(realpath)

	// add all the tags
	rs.makeTagBox(box2)

	rs.readGitConfig()

	rs.readOnly.SetValue("true")
	// ignore everything else for now
	// todo: move this logic to cfgfile.go
	if strings.HasPrefix(path, "go.wit.com") {
		rs.readOnly.SetValue("false")
	}
	if strings.HasPrefix(path, "git.wit.org") {
		rs.readOnly.SetValue("false")
	}

	// tries 'master', 'main', etc.
	rs.guessMainWorkingName()
	// tries 'devel', etc
	rs.guessDevelWorkingName()
	// sets this to os.Username
	rs.setUserWorkingName()

	if isGoLang {
		rs.isGoLang.SetText("true")
		rs.goPath.SetText(path)
	}
	windowMap[path] = rs
	return nil, rs
}