#   _____                         _
#  / ____|                       (_)
# | (___   ___  __ _ _____      ___ _ __ ___  _ __ ___   ___ _ __
#  \___ \ / _ \/ _` / __\ \ /\ / / | '_ ` _ \| '_ ` _ \ / _ \ '__|
#  ____) |  __/ (_| \__ \\ V  V /| | | | | | | | | | | |  __/ |
# |_____/ \___|\__,_|___/ \_/\_/ |_|_| |_| |_|_| |_| |_|\___|_|

import contextlib
import json
import re

from red_commons.logging import getLogger
from redbot.cogs.downloader import errors
from redbot.cogs.downloader.converters import InstalledCog
from redbot.core import commands
from redbot.core.bot import Red
from redbot.core.utils.chat_formatting import (error, humanize_list,
                                               text_to_file)


# pylint: disable=protected-access
class Backup(commands.Cog):
    """A utility to make reinstalling repositories and cogs after migrating the bot far easier."""

    __author__ = ["SeaswimmerTheFsh"]
    __version__ = "1.0.1"

    def __init__(self, bot: Red):
        super().__init__()
        self.bot = bot
        self.logger = getLogger("red.seacogs.backup")

    def format_help_for_context(self, ctx: commands.Context) -> str:
        pre_processed = super().format_help_for_context(ctx) or ""
        n = "\n" if "\n\n" not in pre_processed else ""
        text = [
            f"{pre_processed}{n}",
            f"Cog Version: **{self.__version__}**",
            f"Author: {humanize_list(self.__author__)}",
        ]
        return "\n".join(text)

    @commands.group(autohelp=True)
    @commands.is_owner()
    async def backup(self, ctx: commands.Context):
        """Backup your installed cogs."""

    @backup.command(name="export")
    @commands.is_owner()
    async def backup_export(self, ctx: commands.Context):
        """Export your installed repositories and cogs to a file."""
        downloader = ctx.bot.get_cog("Downloader")
        if downloader is None:
            await ctx.send(
                error(
                    f"You do not have the `Downloader` cog loaded. Please run `{ctx.prefix}load downloader` and try again."
                )
            )
            return

        all_repos = list(downloader._repo_manager.repos)

        export_data = []

        for repo in all_repos:
            repo_dict = {
                "name": repo.name,
                "url": repo.url,
                "branch": repo.branch,
                "cogs": [],
            }

            cogs = await downloader.installed_cogs()

            for cog in cogs:
                if cog.repo_name == repo.name:
                    cog_dict = {
                        "name": cog.name,
                        # "loaded": cog.name in ctx.bot.extensions.keys(),
                        # this functionality was planned but never implemented due to Red limitations
                        # and the possibility of restoration functionality being added to Core
                        "pinned": cog.pinned,
                        "commit": cog.commit,
                    }
                    repo_dict["cogs"].append(cog_dict)

            export_data.append(repo_dict)

        await ctx.send(
            file=text_to_file(json.dumps(export_data, indent=4), "backup.json")
        )

    @backup.command(name="import")
    @commands.is_owner()
    async def backup_import(self, ctx: commands.Context):
        """Import your installed repositories and cogs from an export file."""
        try:
            export = json.loads(await ctx.message.attachments[0].read())
        except (json.JSONDecodeError, IndexError):
            try:
                export = json.loads(await ctx.message.reference.resolved.attachments[0].read())
            except (json.JSONDecodeError, IndexError):
                await ctx.send(error("Please provide a valid JSON export file."))
                return

        downloader = ctx.bot.get_cog("Downloader")
        if downloader is None:
            await ctx.send(
                error(
                    f"You do not have the `Downloader` cog loaded. Please run `{ctx.prefix}load downloader` and try again."
                )
            )
            return

        repo_s = []
        uninstall_s = []
        install_s = []
        repo_e = []
        uninstall_e = []
        install_e = []

        async with ctx.typing():
            for repo in export:
                # Most of this code is from the Downloader cog.
                name = repo["name"]
                branch = repo["branch"]
                url = repo["url"]
                cogs = repo["cogs"]

                if "PyLav/Red-Cogs" in url:
                    repo_e.append("PyLav cogs are not supported.")
                    continue
                if name.startswith(".") or name.endswith("."):
                    repo_e.append(
                        f"Invalid repository name: {name}\nRepository names cannot start or end with a dot."
                    )
                    continue
                if re.match(r"^[a-zA-Z0-9_\-\.]+$", name) is None:
                    repo_e.append(
                        f"Invalid repository name: {name}\nRepository names may only contain letters, numbers, underscores, hyphens, and dots."
                    )
                    continue

                try:
                    repository = await downloader._repo_manager.add_repo(
                        url, name, branch
                    )
                    repo_s.append(
                        f"Added repository {name} from {url} on branch {branch}."
                    )
                    self.logger.debug(
                        "Added repository %s from %s on branch %s", name, url, branch
                    )

                except errors.ExistingGitRepo:
                    repo_e.append(f"Repository {name} already exists.")
                    repository = downloader._repo_manager.get_repo(
                        name
                    )
                    self.logger.debug("Repository %s already exists", name)

                # This is commented out because errors.AuthenticationError is not yet implemented in Red 3.5.5's Downloader cog.
                # Rather, it is only in the development version and will be added in version 3.5.6 (or whatever the next version is).
                # except errors.AuthenticationError as err:
                #     repo_e.append(f"Authentication error while adding repository {name}. See logs for more information.")
                #     self.logger.exception(
                #         "Something went wrong whilst cloning %s (to revision %s)",
                #         url,
                #         branch,
                #         exc_info=err,
                #     )
                #     continue

                except errors.CloningError as err:
                    repo_e.append(
                        f"Cloning error while adding repository {name}. See logs for more information."
                    )
                    self.logger.exception(
                        "Something went wrong whilst cloning %s (to revision %s)",
                        url,
                        branch,
                        exc_info=err,
                    )
                    continue

                except OSError:
                    repo_e.append(
                        f"OS error while adding repository {name}. See logs for more information."
                    )
                    self.logger.exception(
                        "Something went wrong trying to add repo %s under name %s",
                        url,
                        name,
                    )
                    continue

                cog_modules = []
                for cog in cogs:
                    # If you're forking this cog, make sure to change these strings!
                    if cog["name"] == "backup" and "SeaswimmerTheFsh/SeaCogs" in url:
                        continue
                    try:
                        cog_module = await InstalledCog.convert(ctx, cog["name"])
                    except commands.BadArgument:
                        uninstall_e.append(f"Failed to uninstall {cog['name']}")
                        continue
                    cog_modules.append(cog_module)

                for cog in set(cog.name for cog in cog_modules):
                    poss_installed_path = (await downloader.cog_install_path()) / cog
                    if poss_installed_path.exists():
                        with contextlib.suppress(commands.ExtensionNotLoaded):
                            await ctx.bot.unload_extension(cog)
                            await ctx.bot.remove_loaded_package(cog)
                        await downloader._delete_cog(
                            poss_installed_path
                        )
                        uninstall_s.append(f"Uninstalled {cog}")
                        self.logger.debug("Uninstalled %s", cog)
                    else:
                        uninstall_e.append(f"Failed to uninstall {cog}")
                        self.logger.warning("Failed to uninstall %s", cog)
                await downloader._remove_from_installed(
                    cog_modules
                )

                for cog in cogs:
                    cog_name = cog["name"]
                    cog_pinned = cog["pinned"]
                    if cog_pinned:
                        commit = cog["commit"]
                    else:
                        commit = None

                    # If you're forking this cog, make sure to change these strings!
                    if cog_name == "backup" and "SeaswimmerTheFsh/SeaCogs" in url:
                        continue

                    async with repository.checkout(
                        commit, exit_to_rev=repository.branch
                    ):
                        cogs_c, message = (
                            await downloader._filter_incorrect_cogs_by_names(
                                repository, [cog_name]
                            )
                        )
                        if not cogs_c:
                            install_e.append(message)
                            self.logger.error(message)
                            continue
                        failed_reqs = await downloader._install_requirements(
                            cogs_c
                        )
                        if failed_reqs:
                            install_e.append(
                                f"Failed to install {cog_name} due to missing requirements: {failed_reqs}"
                            )
                            self.logger.error(
                                "Failed to install %s due to missing requirements: %s",
                                cog_name,
                                failed_reqs,
                            )
                            continue

                        installed_cogs, failed_cogs = await downloader._install_cogs(
                            cogs_c
                        )

                        if repository.available_libraries:
                            installed_libs, failed_libs = (
                                await repository.install_libraries(
                                    target_dir=downloader.SHAREDLIB_PATH,
                                    req_target_dir=downloader.LIB_PATH,
                                )
                            )
                        else:
                            installed_libs = None
                            failed_libs = None

                        if cog_pinned:
                            for cog in installed_cogs:
                                cog.pinned = True

                        await downloader._save_to_installed(
                            installed_cogs + installed_libs
                            if installed_libs
                            else installed_cogs
                        )
                        if installed_cogs:
                            installed_cog_name = installed_cogs[0].name
                            install_s.append(f"Installed {installed_cog_name}")
                            self.logger.debug("Installed %s", installed_cog_name)
                        if installed_libs:
                            for lib in installed_libs:
                                install_s.append(
                                    f"Installed {lib.name} required for {cog_name}"
                                )
                                self.logger.debug(
                                    "Installed %s required for %s", lib.name, cog_name
                                )
                        if failed_cogs:
                            failed_cog_name = failed_cogs[0].name
                            install_e.append(f"Failed to install {failed_cog_name}")
                            self.logger.error("Failed to install %s", failed_cog_name)
                        if failed_libs:
                            for lib in failed_libs:
                                install_e.append(
                                    f"Failed to install {lib.name} required for {cog_name}"
                                )
                                self.logger.error(
                                    "Failed to install %s required for %s",
                                    lib.name,
                                    cog_name,
                                )
        await ctx.send(
            "Import complete!",
            file=text_to_file(
                f"Repositories:\n{repo_s}\n\nRepository Errors:\n{repo_e}\n\nUninstalled Cogs:\n{uninstall_s}\n\nUninstalled Cogs Errors:\n{uninstall_e}\n\nInstalled Cogs:\n{install_s}\n\nInstalled Cogs Errors:\n{install_e}",
                "backup.log",
            ),
        )
