# 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 ..hf_api import HfApi, HfFolder
from . import BaseTransformersCLICommand


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)
