# Copyright 2020 The HuggingFace Team. All rights reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

import os
import subprocess
import sys
from argparse import ArgumentParser
from getpass import getpass
from typing import List, Union

from requests.exceptions import HTTPError
from transformers.commands import BaseTransformersCLICommand
from transformers.hf_api import HfApi, HfFolder


UPLOAD_MAX_FILES = 15


class UserCommands(BaseTransformersCLICommand):
    @staticmethod
    def register_subcommand(parser: ArgumentParser):
        login_parser = parser.add_parser("login", help="Log in using the same credentials as on huggingface.co")
        login_parser.set_defaults(func=lambda args: LoginCommand(args))
        whoami_parser = parser.add_parser("whoami", help="Find out which huggingface.co account you are logged in as.")
        whoami_parser.set_defaults(func=lambda args: WhoamiCommand(args))
        logout_parser = parser.add_parser("logout", help="Log out")
        logout_parser.set_defaults(func=lambda args: LogoutCommand(args))
        # s3_datasets (s3-based system)
        s3_parser = parser.add_parser(
            "s3_datasets", help="{ls, rm} Commands to interact with the files you upload on S3."
        )
        s3_subparsers = s3_parser.add_subparsers(help="s3 related commands")
        ls_parser = s3_subparsers.add_parser("ls")
        ls_parser.add_argument("--organization", type=str, help="Optional: organization namespace.")
        ls_parser.set_defaults(func=lambda args: ListObjsCommand(args))
        rm_parser = s3_subparsers.add_parser("rm")
        rm_parser.add_argument("filename", type=str, help="individual object filename to delete from huggingface.co.")
        rm_parser.add_argument("--organization", type=str, help="Optional: organization namespace.")
        rm_parser.set_defaults(func=lambda args: DeleteObjCommand(args))
        upload_parser = s3_subparsers.add_parser("upload", help="Upload a file to S3.")
        upload_parser.add_argument("path", type=str, help="Local path of the folder or individual file to upload.")
        upload_parser.add_argument("--organization", type=str, help="Optional: organization namespace.")
        upload_parser.add_argument(
            "--filename", type=str, default=None, help="Optional: override individual object filename on S3."
        )
        upload_parser.add_argument("-y", "--yes", action="store_true", help="Optional: answer Yes to the prompt")
        upload_parser.set_defaults(func=lambda args: UploadCommand(args))
        # deprecated model upload
        upload_parser = parser.add_parser(
            "upload",
            help=(
                "Deprecated: used to be the way to upload a model to S3."
                " We now use a git-based system for storing models and other artifacts."
                " Use the `repo create` command instead."
            ),
        )
        upload_parser.set_defaults(func=lambda args: DeprecatedUploadCommand(args))

        # new system: git-based repo system
        repo_parser = parser.add_parser(
            "repo", help="{create, ls-files} Commands to interact with your huggingface.co repos."
        )
        repo_subparsers = repo_parser.add_subparsers(help="huggingface.co repos related commands")
        ls_parser = repo_subparsers.add_parser("ls-files", help="List all your files on huggingface.co")
        ls_parser.add_argument("--organization", type=str, help="Optional: organization namespace.")
        ls_parser.set_defaults(func=lambda args: ListReposObjsCommand(args))
        repo_create_parser = repo_subparsers.add_parser("create", help="Create a new repo on huggingface.co")
        repo_create_parser.add_argument(
            "name",
            type=str,
            help="Name for your model's repo. Will be namespaced under your username to build the model id.",
        )
        repo_create_parser.add_argument("--organization", type=str, help="Optional: organization namespace.")
        repo_create_parser.add_argument("-y", "--yes", action="store_true", help="Optional: answer Yes to the prompt")
        repo_create_parser.set_defaults(func=lambda args: RepoCreateCommand(args))


class ANSI:
    """
    Helper for en.wikipedia.org/wiki/ANSI_escape_code
    """

    _bold = "\u001b[1m"
    _red = "\u001b[31m"
    _gray = "\u001b[90m"
    _reset = "\u001b[0m"

    @classmethod
    def bold(cls, s):
        return "{}{}{}".format(cls._bold, s, cls._reset)

    @classmethod
    def red(cls, s):
        return "{}{}{}".format(cls._bold + cls._red, s, cls._reset)

    @classmethod
    def gray(cls, s):
        return "{}{}{}".format(cls._gray, s, cls._reset)


def tabulate(rows: List[List[Union[str, int]]], headers: List[str]) -> str:
    """
    Inspired by:

    - stackoverflow.com/a/8356620/593036
    - stackoverflow.com/questions/9535954/printing-lists-as-tabular-data
    """
    col_widths = [max(len(str(x)) for x in col) for col in zip(*rows, headers)]
    row_format = ("{{:{}}} " * len(headers)).format(*col_widths)
    lines = []
    lines.append(row_format.format(*headers))
    lines.append(row_format.format(*["-" * w for w in col_widths]))
    for row in rows:
        lines.append(row_format.format(*row))
    return "\n".join(lines)


class BaseUserCommand:
    def __init__(self, args):
        self.args = args
        self._api = HfApi()


class LoginCommand(BaseUserCommand):
    def run(self):
        print(  # docstyle-ignore
            """
        _|    _|  _|    _|    _|_|_|    _|_|_|  _|_|_|  _|      _|    _|_|_|      _|_|_|_|    _|_|      _|_|_|  _|_|_|_|
        _|    _|  _|    _|  _|        _|          _|    _|_|    _|  _|            _|        _|    _|  _|        _|
        _|_|_|_|  _|    _|  _|  _|_|  _|  _|_|    _|    _|  _|  _|  _|  _|_|      _|_|_|    _|_|_|_|  _|        _|_|_|
        _|    _|  _|    _|  _|    _|  _|    _|    _|    _|    _|_|  _|    _|      _|        _|    _|  _|        _|
        _|    _|    _|_|      _|_|_|    _|_|_|  _|_|_|  _|      _|    _|_|_|      _|        _|    _|    _|_|_|  _|_|_|_|

        """
        )
        username = input("Username: ")
        password = getpass()
        try:
            token = self._api.login(username, password)
        except HTTPError as e:
            # probably invalid credentials, display error message.
            print(e)
            print(ANSI.red(e.response.text))
            exit(1)
        HfFolder.save_token(token)
        print("Login successful")
        print("Your token:", token, "\n")
        print("Your token has been saved to", HfFolder.path_token)


class WhoamiCommand(BaseUserCommand):
    def run(self):
        token = HfFolder.get_token()
        if token is None:
            print("Not logged in")
            exit()
        try:
            user, orgs = self._api.whoami(token)
            print(user)
            if orgs:
                print(ANSI.bold("orgs: "), ",".join(orgs))
        except HTTPError as e:
            print(e)
            print(ANSI.red(e.response.text))
            exit(1)


class LogoutCommand(BaseUserCommand):
    def run(self):
        token = HfFolder.get_token()
        if token is None:
            print("Not logged in")
            exit()
        HfFolder.delete_token()
        self._api.logout(token)
        print("Successfully logged out.")


class ListObjsCommand(BaseUserCommand):
    def run(self):
        token = HfFolder.get_token()
        if token is None:
            print("Not logged in")
            exit(1)
        try:
            objs = self._api.list_objs(token, organization=self.args.organization)
        except HTTPError as e:
            print(e)
            print(ANSI.red(e.response.text))
            exit(1)
        if len(objs) == 0:
            print("No shared file yet")
            exit()
        rows = [[obj.filename, obj.LastModified, obj.ETag, obj.Size] for obj in objs]
        print(tabulate(rows, headers=["Filename", "LastModified", "ETag", "Size"]))


class DeleteObjCommand(BaseUserCommand):
    def run(self):
        token = HfFolder.get_token()
        if token is None:
            print("Not logged in")
            exit(1)
        try:
            self._api.delete_obj(token, filename=self.args.filename, organization=self.args.organization)
        except HTTPError as e:
            print(e)
            print(ANSI.red(e.response.text))
            exit(1)
        print("Done")


class ListReposObjsCommand(BaseUserCommand):
    def run(self):
        token = HfFolder.get_token()
        if token is None:
            print("Not logged in")
            exit(1)
        try:
            objs = self._api.list_repos_objs(token, organization=self.args.organization)
        except HTTPError as e:
            print(e)
            print(ANSI.red(e.response.text))
            exit(1)
        if len(objs) == 0:
            print("No shared file yet")
            exit()
        rows = [[obj.filename, obj.lastModified, obj.commit, obj.size] for obj in objs]
        print(tabulate(rows, headers=["Filename", "LastModified", "Commit-Sha", "Size"]))


class RepoCreateCommand(BaseUserCommand):
    def run(self):
        token = HfFolder.get_token()
        if token is None:
            print("Not logged in")
            exit(1)
        try:
            stdout = subprocess.check_output(["git", "--version"]).decode("utf-8")
            print(ANSI.gray(stdout.strip()))
        except FileNotFoundError:
            print("Looks like you do not have git installed, please install.")

        try:
            stdout = subprocess.check_output(["git-lfs", "--version"]).decode("utf-8")
            print(ANSI.gray(stdout.strip()))
        except FileNotFoundError:
            print(
                ANSI.red(
                    "Looks like you do not have git-lfs installed, please install."
                    " You can install from https://git-lfs.github.com/."
                    " Then run `git lfs install` (you only have to do this once)."
                )
            )
        print("")

        user, _ = self._api.whoami(token)
        namespace = self.args.organization if self.args.organization is not None else user

        print("You are about to create {}".format(ANSI.bold(namespace + "/" + self.args.name)))

        if not self.args.yes:
            choice = input("Proceed? [Y/n] ").lower()
            if not (choice == "" or choice == "y" or choice == "yes"):
                print("Abort")
                exit()
        try:
            url = self._api.create_repo(token, name=self.args.name, organization=self.args.organization)
        except HTTPError as e:
            print(e)
            print(ANSI.red(e.response.text))
            exit(1)
        print("\nYour repo now lives at:")
        print("  {}".format(ANSI.bold(url)))
        print("\nYou can clone it locally with the command below," " and commit/push as usual.")
        print(f"\n  git clone {url}")
        print("")


class DeprecatedUploadCommand(BaseUserCommand):
    def run(self):
        print(
            ANSI.red(
                "Deprecated: used to be the way to upload a model to S3."
                " We now use a git-based system for storing models and other artifacts."
                " Use the `repo create` command instead."
            )
        )
        exit(1)


class UploadCommand(BaseUserCommand):
    def walk_dir(self, rel_path):
        """
        Recursively list all files in a folder.
        """
        entries: List[os.DirEntry] = list(os.scandir(rel_path))
        files = [(os.path.join(os.getcwd(), f.path), f.path) for f in entries if f.is_file()]  # (filepath, filename)
        for f in entries:
            if f.is_dir():
                files += self.walk_dir(f.path)
        return files

    def run(self):
        token = HfFolder.get_token()
        if token is None:
            print("Not logged in")
            exit(1)
        local_path = os.path.abspath(self.args.path)
        if os.path.isdir(local_path):
            if self.args.filename is not None:
                raise ValueError("Cannot specify a filename override when uploading a folder.")
            rel_path = os.path.basename(local_path)
            files = self.walk_dir(rel_path)
        elif os.path.isfile(local_path):
            filename = self.args.filename if self.args.filename is not None else os.path.basename(local_path)
            files = [(local_path, filename)]
        else:
            raise ValueError("Not a valid file or directory: {}".format(local_path))

        if sys.platform == "win32":
            files = [(filepath, filename.replace(os.sep, "/")) for filepath, filename in files]

        if len(files) > UPLOAD_MAX_FILES:
            print(
                "About to upload {} files to S3. This is probably wrong. Please filter files before uploading.".format(
                    ANSI.bold(len(files))
                )
            )
            exit(1)

        user, _ = self._api.whoami(token)
        namespace = self.args.organization if self.args.organization is not None else user

        for filepath, filename in files:
            print(
                "About to upload file {} to S3 under filename {} and namespace {}".format(
                    ANSI.bold(filepath), ANSI.bold(filename), ANSI.bold(namespace)
                )
            )

        if not self.args.yes:
            choice = input("Proceed? [Y/n] ").lower()
            if not (choice == "" or choice == "y" or choice == "yes"):
                print("Abort")
                exit()
        print(ANSI.bold("Uploading... This might take a while if files are large"))
        for filepath, filename in files:
            try:
                access_url = self._api.presign_and_upload(
                    token=token, filename=filename, filepath=filepath, organization=self.args.organization
                )
            except HTTPError as e:
                print(e)
                print(ANSI.red(e.response.text))
                exit(1)
            print("Your file now lives at:")
            print(access_url)
