"""
# Auto downloading from GitHub

```python
from tf.advanced.repo import checkoutRepo

checkoutRepo(
  org='annotation'
  repo='tutorials',
  folder='text-fabric/examples/banks/tf',
  version='',
  checkout='',
  source=None,
  dest=None,
  withPaths=True,
  keep=True,
  silent=False,
  label='data',
)
```

## Description

Maintain a local copy of a subfolder *folder* in GitHub repository *repo* of *org*.
The copy may be taken from any point in the commit history of the online repo.

If you call this function, it will check whether the requested data is already
on your computer in the expected location.
If not, it may check whether the data is online and if so, download it to the
expected location.

## Result

The result of a call to checkoutRepo() is a tuple:

```python
    (commitOffline, releaseOffline, kindLocal, localBase, localDir)
```

Here is the meaning:

*   *commitOffline* is the commit hash of the data you have offline afterwards
*   *releaseOffline* is the release tag of the data you have offline afterwards
*   *kindLocal* indicates whether an online check has been performed:
    it is `None` if there has been an online check. Otherwise it is
    `clone` if the data is in your `~/github` directory else it is `local`.
*   *localBase* where the data is under: `~/github` or `~/text-fabric-data`,
    or whatever you have passed as *source* and *dest*, see below.
*   *localDir* releative path from *localBase* to your data.
    If your data has versions, *localDir* points to directory that has the versions,
    not to a specific version.


Your local copy can be found under your `~/github` or `~/text-fabric-data`
directory using a relative path *org/repo/folder* if there is a *version*, else
*org/repo/folder/version*.

## checkout, source and dest

The *checkout* parameter determines from which point in the history the copy
will be taken and where it will be placed.
That will be either your `~/github` or your `~/text-fabric-data` directories.

You can override the hard-coded `~/github` and `~/text-fabric-data` directories
by passing *source* and *dest* respectively.

See the
[repo](https://nbviewer.jupyter.org/github/annotation/banks/blob/master/tutorial/repo.ipynb)
notebook for an exhaustive demo of all the checkout options.

## other parameters

*withPaths=False* will loose the directory structure of files that are being
downloaded.

*keep=False* will destroy the destination directory before a download takes place.

*silent=True* will suppress non-error messages.

*label='something' will change the word "data" in log messages to what you choose.
We use `label='TF-app'` when we use this function to checkout the code
of a TF-app.

## Rate limiting

The `checkRepo()` function uses the GitHub API.
GitHub has a rate limiting policy for its API of max 60 calls per hour.
See below to deal with this if it becomes a problem.

# GitHub

GitHub has a rate limiting policy for its API of max 60 calls per hour.
This can be too restrictive, and here are two ways to keep working nevertheless.

## Increase the rate limit

If you use this function in an application of yours that uses it very often,
you can increase the limit to 5000 calls per hour by making yourself known.

* [create a personal access token](https://github.com/settings/tokens)
* Copy your token and put it in an environment variable named `GHPERS`
  on the system where your app runs.
  See below how to do that.
* If `checkoutRepo` finds this variable, it will add the
  token to every GitHub API call it makes, and that will
  increase the rate.
* Never pass your personal credentials on to others, let them obtain their own!

You might want to read this:

* [Read more about rate limiting on Github](https://docs.github.com/en/rest/overview/resources-in-the-rest-api#rate-limiting)

How to put your personal access token into an environment variable?

!!! note "What is an environment variable?"
    It is a setting on your system that various programs/processes can read.
    On Windows it is part of the `Registry`.

    In this particular case, you put a personal token that you obtain from GitHub
    in such an environment variable.
    When Text-Fabric accesses GitHub, it will look up this token
    first, and pass it to the GitHub API. GitHub then knows who you are and
    will give you more privileges.

### On Mac and Linux

Find the file that contains your terminal settings. In many cases that is
`.bash_profile` in your home directory.

Some people put commands like these in their `~/.bashrc` file, which is also fine.
If you do not see a `.bashrc` file, put it into your `.bash_profile` file.

A slightly more advanced shell than `bash` is `zsh` and it is the default on newer
Macs. If that is your case, look for a file `.zshrc` in your home directory or
create one.

Whatever is your case, pick the file indicated above and edit it.

!!! hint "How to edit a file in your terminal?"
    If you are already familiar with `vi`, `vim`, `emacs`, or `nano`
    you already know how to do it.

    If not, `nano` is simple editor that is useful for tasks like this.
    Assuming that you want to edit the `.zshrc` in your home directory,
    go to your terminal and say this:

        nano ~/.zshrc

    Then you get a view on your file. Then

    *   press `Ctrl V` a number of times till you are at the end of the file,
    *   type the two lines lines of text (specified in the next step), or
        copy them from the clipboard
    *   type `Ctrl X` to exit; nano will ask you to save changes, type `Y`,
        it will then verify the file name, type `Enter` and you're done

Put the following lines in this file:

``` sh
GHPERS="xxx"
export GHPERS
```

where the `xxx` are replaced by your actual token.

Then restart your terminal or say in an existing terminal

```  sh
source ~/.zshrc
```

### On Windows

Click on the Start button and type in `environment variable` into the search box.

Click on `Edit the system environment variables`.

This will  open up the System Properties dialog to the Advanced tab.

Click on the `Environment Variables button` at the bottom.

Click on `New ...` under `User environment variables`.

Then fill in `GHPERS` under *name* and the token string under *value*.

Then quit the command prompt and start a new one.

### Result

With this done, you will automatically get the good rate limit,
whenever you fire up Text-Fabric in the future.

## Minimize accessing Github

Another way te avoid being bitten by the rate limit is to reduce the number
of your access actions to GitHub.

There are two instances where Text-Fabric wants to access GitHub:

1. when you start the Text-Fabric browser from the command line
2. when you give the `use()` command in your Python program (or in a Jupyter Notebook).

### Using a corpus for the first time, within the rate limit

If you are still within the rate limit, just give the usual commands, such as

``` sh
text-fabric org/repo
```

or

``` python
use('org/repo', hoist=globals())
```

where `corpus` should be replaced with the real name of your corpus.

The data will be downloaded to your computer and stored in your
`~/text-fabric-data` directory tree.

### Using a corpus for the first time, after hitting the rate limit

If you want to load a new corpus after having passed the rate limit, and not
wanting to wait an hour, you could directly clone the repos from GitHub:

Open your terminal, and go to (or create) directory `~/github` (in your
home directory).

Inside that directory, go to or create directory `org`
Go to that directory.

Then do

``` sh
git clone https://github.com/org/repo
```

(replacing `org` and `repo` with the values that apply to your corpus).

This will fetch the Text-Fabric *data*, *app*, and *tutorials* for that corpus.

Now you have all data you need on your system.

If you want to see by example how to use this data, have a look at
[repo](https://nbviewer.jupyter.org/github/annotation/banks/blob/master/tutorial/repo.ipynb),
especially when it discusses `clone`.

In order to run Text-Fabric without further access to GitHub, say

``` sh
text-fabric corpus:clone checkout=clone
```

or, in a program,

``` python
A = use('org/repo:clone', checkData='clone', hoist=globals())
```

This will instruct Text-Fabric to use the app and data from within your `~/github`
directory tree.

### Using a corpus that you already have

Depending on how you got the corpus, it is in your
`~/github` or in your `~/text-fabric-data` directory tree.

If you cloned it from GitHub or created it yourself, it is in your `~/github` tree;
if you used the autoload of Text-Fabric it is in your `~/text-fabric-data`.

In the first case, do this:

``` sh
text-fabric corpus:clone checkout=clone
```

or, in a program,

``` python
A = use('org/repo:clone', checkData='clone', hoist=globals())
```

In the second case, do just this:

``` sh
text-fabric corpus
```

or, in a program,

``` python
A = use('org/repo', hoist=globals())
```

See also `tf.advanced.app.App`.

### Updating a corpus that you already have

If you cloned it from GitHub (or created it yourself in your `~/github` tree):

In your terminal:

``` sh
cd ~/github/organization/repo
git pull origin master
```

(replacing `organization` with the name of the organization where the corpus resides
and `corpus` with the name of your corpus).

Now you have the newest corpus data on your system. and you can use it as follows:

``` sh
text-fabric corpus:clone checkout=clone
```

or, in a program,

``` python
A = use('org/repo:clone', checkData='clone', hoist=globals())
```

If you have autoloaded it from GitHub, you have to add the `latest` or `hot` specifier:

``` sh
text-fabric corpus:latest checkout=latest
```

or, in a program,

``` python
A = use('org/repo:latest', checkData='latest', hoist=globals())
```

And after that, you can omit `latest` or `hot` again, until you need new data again.

!!! hint "App versus data"
    The checkout specifiers such as `latest`, `hot`, `clone` apply to either the corpus data
    or the TF App.

    If the specifier follows the app name, separated with a colon, it directs how the app code
    is being obtained.

    If it is the value of the `checkout` parameter, it directs how the corpus data
    is being obtained.
"""

import os
import io
import re
from shutil import rmtree
import requests
import base64
from zipfile import ZipFile

from github import Github, GithubException, UnknownObjectException

from ..parameters import (
    URL_GH,
    URL_TFDOC,
    GH_BASE,
    EXPRESS_BASE,
    EXPRESS_SYNC,
    EXPRESS_SYNC_LEGACY,
    DOWNLOADS,
)
from ..core.helpers import console, htmlEsc, expanduser, initTree
from .helpers import dh
from .zipdata import zipData


class Repo:
    def __init__(
        self,
        org,
        repo,
        folder,
        version,
        increase,
        source=GH_BASE,
        dest=DOWNLOADS,
    ):
        self.org = org
        self.repo = repo
        self.folder = folder
        self.version = version
        self.increase = increase
        self.source = expanduser(source)
        self.dest = expanduser(dest)

        self.repoOnline = None
        self.ghConn = None

    def newRelease(self):
        if not self.makeZip():
            return False

        self.connect()
        if not self.ghConn:
            return False

        if not self.fetchInfo():
            return False

        if not self.bumpRelease():
            return False

        if not self.makeRelease():
            return False

        if not self.uploadZip():
            return False

        return True

    def makeZip(self):
        source = self.source
        dest = self.dest
        org = self.org
        repo = self.repo
        folder = self.folder
        version = self.version

        dataIn = f"{source}/{org}/{repo}/{folder}/{version}"

        if not os.path.exists(dataIn):
            console(f"No data found in {dataIn}", error=True)
            return False

        zipData(org, repo, version=version, relative=folder, source=source, dest=dest)
        return True

    def connect(self):
        warning = self.warning

        if not self.ghConn:
            ghPerson = os.environ.get("GHPERS", None)
            if ghPerson:
                self.ghConn = Github(ghPerson)
            else:
                ghClient = os.environ.get("GHCLIENT", None)
                ghSecret = os.environ.get("GHSECRET", None)
                if ghClient and ghSecret:
                    self.ghConn = Github(client_id=ghClient, client_secret=ghSecret)
                else:
                    self.ghConn = Github()
        try:
            rate = self.ghConn.get_rate_limit().core
            self.log(
                f"rate limit is {rate.limit} requests per hour,"
                f" with {rate.remaining} left for this hour"
            )
            if rate.limit < 100:
                warning(f"To increase the rate," f"see {URL_TFDOC}/advanced/repo.html#github")

            self.log(
                f"\tconnecting to online GitHub repo {self.org}/{self.repo} ... ",
                newline=False,
            )
            self.repoOnline = self.ghConn.get_repo(f"{self.org}/{self.repo}")
            self.log("connected")
        except GithubException as why:
            warning("failed")
            warning(f"GitHub says: {why}")
        except IOError:
            warning("no internet")

    def fetchInfo(self):
        g = self.repoOnline
        if not g:
            return False
        self.commitOn = None
        self.releaseOn = None
        self.releaseCommitOn = None
        result = self.getRelease()
        if result:
            self.releaseOn = result
        result = self.getCommit()
        if result:
            self.commitOn = result
        return True

    def bumpRelease(self):
        increase = self.increase

        latestR = self.releaseOn
        if latestR:
            console(f"Latest release = {latestR}")
        else:
            latestR = "v0.0.0"
            console("No releases yet")

        # bump the release version

        v = ""
        if latestR.startswith("v"):
            v = "v"
            r = latestR[1:] if latestR.startswith("v") else latestR
        parts = [int(p) for p in r.split(".")]
        nParts = len(parts)
        if nParts < increase:
            for i in range(nParts, increase):
                parts.append(0)
        parts[increase - 1] += 1
        parts[increase:] = []
        newTag = f"{v}{'.'.join(str(p) for p in parts)}"
        console(f"New release = {newTag}")
        self.newTag = newTag
        return True

    def makeRelease(self):
        commit = self.commitOn
        newTag = self.newTag

        g = self.repoOnline
        if not g:
            return False

        tag_message = "data update"
        release_name = "data update"
        release_message = "data update"

        try:
            newReleaseObj = g.create_git_tag_and_release(
                newTag,
                tag_message,
                release_name,
                release_message,
                commit,
                "commit",
            )
        except Exception as e:
            self.error("\tcannot create release", newline=True)
            console(str(e), error=True)
            return False

        self.newReleaseObj = newReleaseObj
        return True

    def uploadZip(self):
        newTag = self.newTag
        newReleaseObj = self.newReleaseObj
        dest = self.dest
        org = self.org
        repo = self.repo
        folder = self.folder
        version = self.version
        dataFile = f"{folder}-{version}.zip"
        dataDir = f"{dest}/{org}-release/{repo}"
        dataPath = f"{dataDir}/{dataFile}"

        if not os.path.exists(dataPath):
            console(f"No release data found: {dataPath}", error=True)
            return False

        try:
            newReleaseObj.upload_asset(dataPath, label='', content_type="application/zip", name=dataFile)
            console(f"{dataFile} attached to release {newTag}")
        except Exception as e:
            self.error("\tcannot attach zipfile to release", newline=True)
            console(str(e), error=True)
            return False

        return True

    def getRelease(self):
        r = self.getReleaseObj()
        if not r:
            return None
        return r.tag_name

    def getReleaseObj(self):
        g = self.repoOnline
        if not g:
            return None

        r = None

        try:
            r = g.get_latest_release()
        except UnknownObjectException:
            self.error("\tno releases", newline=True)
        except Exception:
            self.error("\tcannot find releases", newline=True)
        return r

    def getCommit(self):
        c = self.getCommitObj()
        if not c:
            return None
        return c.sha

    def getCommitObj(self):
        error = self.error

        g = self.repoOnline
        if not g:
            return None

        c = None

        try:
            cs = g.get_commits()
            if cs.totalCount:
                c = cs[0]
            else:
                error("\tno commits")
        except Exception:
            error("\tcannot find commits")
        return c

    def log(self, msg, newline=True):
        console(msg, newline=newline)

    def warning(self, msg, newline=True):
        console(msg, newline=newline)

    def error(self, msg, newline=True):
        console(msg, error=True, newline=newline)


def releaseData(org, repo, folder, version, increase, source=GH_BASE, dest=DOWNLOADS):
    """
    increase:
    1 = bump major version;
    2 = bump intermediate version;
    3 = bump minor version
    """
    R = Repo(org, repo, folder, version, increase, source=source, dest=dest)
    return R.newRelease()


class Checkout(object):
    @staticmethod
    def fromString(string):
        commit = None
        release = None
        local = None
        if not string:
            commit = ""
            release = ""
        elif string == "latest":
            commit = None
            release = ""
        elif string == "hot":
            commit = ""
            release = None
        elif string in {"local", "clone"}:
            commit = None
            release = None
            local = string
        elif "." in string or len(string) < 12:
            commit = None
            release = string
        else:
            commit = string
            release = None
        return (commit, release, local)

    @staticmethod
    def toString(commit, release, local, source=GH_BASE, dest=EXPRESS_BASE):
        extra = ""
        if local:
            baseRep = source if local == "clone" else dest
            extra = f" offline under {baseRep}"
        if local == "clone":
            result = "repo clone"
        elif commit and release:
            result = f"r{release}=#{commit}"
        elif commit:
            result = f"#{commit}"
        elif release:
            result = f"r{release}"
        elif commit is None and release is None:
            result = "unknown release or commit"
        elif commit is None:
            result = "latest release"
        elif release is None:
            result = "latest commit"
        else:
            result = "latest release or commit"
        return f"{result}{extra}"

    def isClone(self):
        return self.local == "clone"

    def isOffline(self):
        return self.local in {"clone", "local"}

    def __init__(
        self,
        org,
        repo,
        relative,
        checkout,
        source,
        dest,
        keep,
        withPaths,
        silent,
        _browse,
        version=None,
        label="data",
    ):
        self._browse = _browse
        self.label = label
        self.org = org
        self.repo = repo
        self.source = source
        self.dest = dest
        (self.commitChk, self.releaseChk, self.local) = self.fromString(checkout)
        clone = self.isClone()
        offline = self.isOffline()

        self.relative = relative
        self.version = version
        versionRep = f"/{version}" if version else ""
        self.versionRep = versionRep
        relativeRep = f"/{relative}" if relative else ""
        relativeGh = f"/tree/master/{relative}" if relative else ""
        self.baseGh = f"{URL_GH}/{org}/{repo}{relativeGh}{versionRep}"
        self.dataDir = f"{relative}{versionRep}"

        self.baseLocal = expanduser(self.dest)
        self.dataRelLocal = f"{org}/{repo}{relativeRep}"
        self.dirPathSaveLocal = f"{self.baseLocal}/{org}/{repo}"
        self.dirPathLocal = f"{self.baseLocal}/{self.dataRelLocal}{versionRep}"
        self.dataPathLocal = f"{self.dataRelLocal}{versionRep}"
        self.filePathLocal = f"{self.dirPathLocal}/{EXPRESS_SYNC}"

        self.baseClone = expanduser(self.source)
        self.dataRelClone = f"{org}/{repo}{relativeRep}"
        self.dirPathClone = f"{self.baseClone}/{self.dataRelClone}{versionRep}"
        self.dataPathClone = f"{self.dataRelClone}{versionRep}"

        self.dataPath = self.dataRelClone if clone else self.dataRelLocal

        self.keep = keep
        self.withPaths = withPaths
        self.ghConn = None

        self.commitOff = None
        self.releaseOff = None
        self.commitOn = None
        self.releaseOn = None
        self.releaseCommitOn = None

        self.silent = silent

        self.repoOnline = None
        self.localBase = False
        self.localDir = None

        if clone:
            self.commitOff = None
            self.releaseOff = None
        else:
            self.fixInfo()
            self.readInfo()

        if not offline:
            self.connect()
            self.fetchInfo()

    def log(self, msg, newline=True):
        silent = self.silent
        if not silent:
            console(msg, newline=newline)

    def warning(self, msg, newline=True):
        silent = self.silent
        if not silent == "deep":
            console(msg, newline=newline)

    def error(self, msg, newline=True):
        console(msg, error=True, newline=newline)

    def possibleError(self, msg, showErrors, again=False, indent="\t", newline=False):
        error = self.error
        warning = self.warning

        if showErrors:
            error(msg, newline=newline)
        else:
            warning(msg, newline=newline)
            if again:
                warning(f"{indent}Will try something else")

    def makeSureLocal(self, attempt=False):
        _browse = self._browse
        label = self.label
        offline = self.isOffline()
        clone = self.isClone()

        error = self.error
        warning = self.warning

        cOff = self.commitOff
        rOff = self.releaseOff
        cChk = self.commitChk
        rChk = self.releaseChk
        cOn = self.commitOn
        rOn = self.releaseOn
        rcOn = self.releaseCommitOn

        askExact = rChk or cChk
        askExactRelease = rChk
        askExactCommit = cChk
        askLatest = not askExact and (rChk == "" or cChk == "")
        askLatestAny = rChk == "" and cChk == ""
        askLatestRelease = rChk == "" and cChk is None
        askLatestCommit = cChk == "" and rChk is None

        isExactReleaseOff = rChk and rChk == rOff
        isExactCommitOff = cChk and cChk == cOff
        isExactReleaseOn = rChk and rChk == rOn
        isExactCommitOn = cChk and cChk == cOn
        isLatestRelease = rOff and rOff == rOn or cOff and cOff == rcOn
        isLatestCommit = cOff and cOff == cOn

        isLocal = (
            askExactRelease
            and isExactReleaseOff
            or askExactCommit
            and isExactCommitOff
            or askLatestAny
            and (isLatestRelease or isLatestCommit)
            or askLatestRelease
            and isLatestRelease
            or askLatestCommit
            and isLatestCommit
        )
        mayLocal = (
            askLatestAny
            and (rOff or cOff)
            or askLatestRelease
            and rOff
            or askLatestCommit
            and cOff
        )
        canOnline = self.repoOnline
        isOnline = canOnline and (
            askExactRelease
            and isExactReleaseOn
            or askExactCommit
            and isExactCommitOn
            or askLatestAny
            or askLatestRelease
            or askLatestCommit
        )

        if offline:
            if clone:
                dirPath = self.dirPathClone
                self.localBase = self.baseClone if os.path.exists(dirPath) else False
            else:
                self.localBase = (
                    self.baseLocal
                    if (
                        cChk
                        and cChk == cOff
                        or cChk is None
                        and cOff
                        or rChk
                        and rChk == rOff
                        or rChk is None
                        and rOff
                    )
                    else False
                )
            if not self.localBase:
                method = self.warning if attempt else self.error
                method(f"The requested {label} is not available offline")
                base = self.baseClone if clone else self.baseLocal
                method(f"\t{base}/{self.dataPath} not found")
        else:
            if isLocal:
                self.localBase = self.baseLocal
            else:
                if not canOnline:
                    if askLatest:
                        if mayLocal:
                            warning(f"The offline {label} may not be the latest")
                            self.localBase = self.baseLocal
                        else:
                            error(f"The requested {label} is not available offline")
                    else:
                        warning(f"The requested {label} is not available offline")
                        error("No online connection")
                elif not isOnline:
                    error(f"The requested {label} is not available online")
                else:
                    self.localBase = self.baseLocal if self.download() else False

        if self.localBase:
            self.localDir = self.dataPath
            state = (
                "requested"
                if askExact
                else "latest release"
                if rChk == "" and canOnline and self.releaseOff
                else "latest? release"
                if rChk == "" and not canOnline and self.releaseOff
                else "latest commit"
                if cChk == "" and canOnline and self.commitOff
                else "latest? commit"
                if cChk == "" and not canOnline and self.commitOff
                else "local release"
                if self.local == "local" and self.releaseOff
                else "local commit"
                if self.local == "local" and self.commitOff
                else "local github"
                if self.local == "clone"
                else "for whatever reason"
            )
            offString = self.toString(
                self.commitOff,
                self.releaseOff,
                self.local,
                dest=self.dest,
                source=self.source,
            )
            labelEsc = htmlEsc(label)
            stateEsc = htmlEsc(state)
            offEsc = htmlEsc(offString)
            locEsc = htmlEsc(f"{self.localBase}/{self.localDir}{self.versionRep}")
            if _browse:
                self.log(
                    f"Using {label} in {self.localBase}/{self.localDir}{self.versionRep}:"
                )
                self.log(f"\t{offString} ({state})")
            else:
                dh(
                    f'<b title="{stateEsc}">{labelEsc}:</b>'
                    f' <span title="{offEsc}">{locEsc}</span>'
                )

    def download(self):
        cChk = self.commitChk
        rChk = self.releaseChk

        fetched = False
        if rChk is not None:
            fetched = self.downloadRelease(rChk, showErrors=cChk is None)
        if not fetched and cChk is not None:
            fetched = self.downloadCommit(cChk, showErrors=True)

        if fetched:
            self.writeInfo()
        return fetched

    def downloadRelease(self, release, showErrors=True):
        cChk = self.commitChk
        r = self.getReleaseObj(release, showErrors=showErrors)
        if not r:
            return False
        (commit, release) = self.getReleaseFromObj(r)

        assets = None
        try:
            assets = r.get_assets()
        except Exception:
            pass
        assetUrl = None
        versionRep3 = f"-{self.version}" if self.version else ""
        relativeFlat = self.relative.replace("/", "-")
        dataFile = f"{relativeFlat}{versionRep3}.zip"
        if assets and assets.totalCount > 0:
            for asset in assets:
                if asset.name == dataFile:
                    assetUrl = asset.browser_download_url
                    break
        fetched = False
        if assetUrl:
            fetched = self.downloadZip(assetUrl, showErrors=False)
        if not fetched:
            thisShowErrors = not cChk == ""
            fetched = self.downloadCommit(commit, showErrors=thisShowErrors)
        if fetched:
            self.commitOff = commit
            self.releaseOff = release
        return fetched

    def downloadCommit(self, commit, showErrors=True):
        c = self.getCommitObj(commit)
        if not c:
            return False
        commit = self.getCommitFromObj(c)
        fetched = self.downloadDir(commit, exclude=r"\.tfx", showErrors=showErrors)
        if fetched:
            self.commitOff = commit
            self.releaseOff = None
        return fetched

    def downloadZip(self, dataUrl, showErrors=True):
        label = self.label
        self.log(f"\tdownloading {dataUrl} ... ")
        try:
            r = requests.get(dataUrl, allow_redirects=True)
            self.log("\tunzipping ... ")
            zf = io.BytesIO(r.content)
        except Exception as e:
            msg = f"\t{str(e)}\n\tcould not download {dataUrl}"
            self.possibleError(msg, showErrors, again=True)
            return False

        self.log(f"\tsaving {label}")

        cwd = os.getcwd()
        destZip = self.dirPathLocal
        try:
            z = ZipFile(zf)
            initTree(destZip, fresh=not self.keep)
            os.chdir(destZip)
            if self.withPaths:
                z.extractall()
                if os.path.exists("__MACOSX"):
                    rmtree("__MACOSX")
            else:
                for zInfo in z.infolist():
                    if zInfo.filename[-1] == "/":
                        continue
                    if zInfo.filename.startswith("__MACOS"):
                        continue
                    zInfo.filename = os.path.basename(zInfo.filename)
                    z.extract(zInfo)
        except Exception:
            msg = f"\tcould not save {label} to {destZip}"
            self.possibleError(msg, showErrors, again=True)
            os.chdir(cwd)
            return False
        os.chdir(cwd)
        return True

    def downloadDir(self, commit, exclude=None, showErrors=False):
        g = self.repoOnline
        if not g:
            return None

        destDir = f"{self.dirPathLocal}"
        destSave = f"{self.dirPathSaveLocal}"
        initTree(destDir, fresh=not self.keep)

        excludeRe = re.compile(exclude) if exclude else None

        good = True

        def _downloadDir(subPath, level=0):
            nonlocal good
            if not good:
                return
            lead = "\t" * level
            try:
                contents = g.get_contents(subPath, ref=commit)
            except UnknownObjectException:
                msg = f"{lead}No directory {subPath} in {self.toString(commit, None, False)}"
                self.possibleError(msg, showErrors, again=True, indent=lead)
                good = False
                return
            for content in contents:
                thisPath = content.path
                self.log(f"\t{lead}{thisPath}...", newline=False)
                if exclude and excludeRe.search(thisPath):
                    self.log("excluded")
                    continue
                if content.type == "dir":
                    self.log("directory")
                    os.makedirs(f"{destSave}/{thisPath}", exist_ok=True)
                    _downloadDir(thisPath, level + 1)
                else:
                    try:
                        fileContent = g.get_git_blob(content.sha)
                        fileData = base64.b64decode(fileContent.content)
                        fileDest = f"{destSave}/{thisPath}"
                        with open(fileDest, "wb") as fd:
                            fd.write(fileData)
                        self.log("downloaded")
                    except (GithubException, IOError):
                        msg = "error"
                        self.possibleError(msg, showErrors, again=True, indent=lead)
                        good = False

        _downloadDir(self.dataDir, 0)

        if good:
            self.log("\tOK")
        else:
            msg = "\tFailed"
            self.possibleError(msg, showErrors)

        return good

    def getRelease(self, release, showErrors=True):
        r = self.getReleaseObj(release, showErrors=showErrors)
        if not r:
            return None
        return self.getReleaseFromObj(r)

    def getCommit(self, commit):
        c = self.getCommitObj(commit)
        if not c:
            return None
        return self.getCommitFromObj(c)

    def getReleaseObj(self, release, showErrors=True):
        g = self.repoOnline
        if not g:
            return None

        r = None
        msg = f' tagged "{release}"' if release else "s"

        try:
            r = g.get_release(release) if release else g.get_latest_release()
        except UnknownObjectException:
            self.possibleError(f"\tno release{msg}", showErrors, newline=True)
        except Exception:
            self.possibleError(f"\tcannot find release{msg}", showErrors, newline=True)
        return r

    def getCommitObj(self, commit):
        error = self.error

        g = self.repoOnline
        if not g:
            return None

        c = None
        msg = f' with hash "{commit}"' if commit else "s"

        try:
            cs = g.get_commits(sha=commit) if commit else g.get_commits()
            if cs.totalCount:
                c = cs[0]
            else:
                error(f"\tno commit{msg}")
        except Exception:
            error(f"\tcannot find commit{msg}")
        return c

    def getReleaseFromObj(self, r):
        g = self.repoOnline
        if not g:
            return None
        release = r.tag_name
        ref = g.get_git_ref(f"tags/{release}")
        commit = ref.object.sha
        return (commit, release)

    def getCommitFromObj(self, c):
        g = self.repoOnline
        if not g:
            return None
        return c.sha

    def fetchInfo(self):
        g = self.repoOnline
        if not g:
            return
        self.commitOn = None
        self.releaseOn = None
        self.releaseCommitOn = None
        if self.releaseChk is not None:
            result = self.getRelease(self.releaseChk, showErrors=self.commitChk is None)
            if result:
                (self.releaseCommitOn, self.releaseOn) = result
        if self.commitChk is not None:
            result = self.getCommit(self.commitChk)
            if result:
                self.commitOn = result

    def fixInfo(self):
        sDir = self.dirPathLocal
        if not os.path.exists(sDir):
            return
        for sFile in EXPRESS_SYNC_LEGACY:
            sPath = f"{sDir}/{sFile}"
            if os.path.exists(sPath):
                goodPath = f"{sDir}/{EXPRESS_SYNC}"
                if os.path.exists(goodPath):
                    os.remove(sPath)
                else:
                    os.rename(sPath, goodPath)

    def readInfo(self):
        if os.path.exists(self.filePathLocal):
            with open(self.filePathLocal, encoding="utf8") as f:
                for line in f:
                    string = line.strip()
                    (commit, release, local) = self.fromString(string)
                    if commit:
                        self.commitOff = commit
                    if release:
                        self.releaseOff = release

    def writeInfo(self):
        if not os.path.exists(self.dirPathLocal):
            os.makedirs(self.dirPathLocal, exist_ok=True)
        with open(self.filePathLocal, "w", encoding="utf8") as f:
            if self.releaseOff:
                f.write(f"{self.releaseOff}\n")
            if self.commitOff:
                f.write(f"{self.commitOff}\n")

    def connect(self):
        warning = self.warning

        if not self.ghConn:
            ghPerson = os.environ.get("GHPERS", None)
            if ghPerson:
                self.ghConn = Github(ghPerson)
            else:
                ghClient = os.environ.get("GHCLIENT", None)
                ghSecret = os.environ.get("GHSECRET", None)
                if ghClient and ghSecret:
                    self.ghConn = Github(client_id=ghClient, client_secret=ghSecret)
                else:
                    self.ghConn = Github()
        try:
            rate = self.ghConn.get_rate_limit().core
            self.log(
                f"rate limit is {rate.limit} requests per hour,"
                f" with {rate.remaining} left for this hour"
            )
            if rate.limit < 100:
                warning(f"To increase the rate," f"see {URL_TFDOC}/advanced/repo.html#github")

            self.log(
                f"\tconnecting to online GitHub repo {self.org}/{self.repo} ... ",
                newline=False,
            )
            self.repoOnline = self.ghConn.get_repo(f"{self.org}/{self.repo}")
            self.log("connected")
        except GithubException as why:
            warning("failed")
            warning(f"GitHub says: {why}")
        except IOError:
            warning("no internet")


def checkoutRepo(
    _browse=False,
    org="annotation",
    repo="tutorials",
    folder="text-fabric/examples/banks/tf",
    version="",
    checkout="",
    source=GH_BASE,
    dest=EXPRESS_BASE,
    withPaths=True,
    keep=True,
    silent=False,
    label="data",
):
    def resolve(chkout, attempt=False):
        rData = Checkout(
            org,
            repo,
            folder,
            chkout,
            source,
            dest,
            keep,
            withPaths,
            silent,
            _browse,
            version=version,
            label=label,
        )
        rData.makeSureLocal(attempt=attempt)
        return (
            (
                rData.commitOff,
                rData.releaseOff,
                rData.local,
                rData.localBase,
                rData.localDir,
            )
            if rData.localBase
            else (None, None, False, False, None)
        )

    if checkout == "":
        rData = resolve("local", attempt=True)
        if rData[3]:
            return rData

    return resolve(checkout)