__author__ = "Gina Häußge <osd@foosel.net>"
__license__ = "GNU Affero General Public License http://www.gnu.org/licenses/agpl.html"
__copyright__ = "Copyright (C) 2015 The OctoPrint Project - Released under terms of the AGPLv3 License"

import sys

import click

click.disable_unicode_literals_warning = True


class OctoPrintDevelCommands(click.MultiCommand):
    """
    Custom `click.MultiCommand <http://click.pocoo.org/5/api/#click.MultiCommand>`_
    implementation that provides commands relevant for (plugin) development
    based on availability of development dependencies.
    """

    sep = ":"
    groups = ("plugin", "css")

    def __init__(self, *args, **kwargs):
        click.MultiCommand.__init__(self, *args, **kwargs)

        from functools import partial

        from octoprint.util.commandline import CommandlineCaller

        def log_util(f):
            def log(*lines):
                for line in lines:
                    f(line)

            return log

        self.command_caller = CommandlineCaller()
        self.command_caller.on_log_call = log_util(lambda x: click.echo(f">> {x}"))
        self.command_caller.on_log_stdout = log_util(click.echo)
        self.command_caller.on_log_stderr = log_util(partial(click.echo, err=True))

    def _get_prefix_methods(self, method_prefix):
        for name in [x for x in dir(self) if x.startswith(method_prefix)]:
            method = getattr(self, name)
            yield method

    def _get_commands_from_prefix_methods(self, method_prefix):
        for method in self._get_prefix_methods(method_prefix):
            result = method()
            if result is not None and isinstance(result, click.Command):
                yield result

    def _get_commands(self):
        result = {}
        for group in self.groups:
            for command in self._get_commands_from_prefix_methods(f"{group}_"):
                result[group + self.sep + command.name] = command
        return result

    def list_commands(self, ctx):
        result = [name for name in self._get_commands()]
        result.sort()
        return result

    def get_command(self, ctx, cmd_name):
        commands = self._get_commands()
        return commands.get(cmd_name, None)

    def plugin_new(self):
        try:
            import cookiecutter.main
        except ImportError:
            return None

        try:
            # we depend on Cookiecutter >= 1.4
            from cookiecutter.prompt import StrictEnvironment
        except ImportError:
            return None

        import contextlib

        @contextlib.contextmanager
        def custom_cookiecutter_config(config):
            """
            Allows overriding cookiecutter's user config with a custom dict
            with fallback to the original data.
            """
            from octoprint.util import fallback_dict

            original_get_user_config = cookiecutter.main.get_user_config
            try:

                def f(*args, **kwargs):
                    original_config = original_get_user_config(*args, **kwargs)
                    return fallback_dict(config, original_config)

                cookiecutter.main.get_user_config = f
                yield
            finally:
                cookiecutter.main.get_user_config = original_get_user_config

        @contextlib.contextmanager
        def custom_cookiecutter_prompt(options):
            """
            Custom cookiecutter prompter for the template config.

            If a setting is available in the provided options (read from the CLI)
            that will be used, otherwise the user will be prompted for a value
            via click.
            """
            original_prompt_for_config = cookiecutter.main.prompt_for_config

            def custom_prompt_for_config(context, no_input=False):
                cookiecutter_dict = {}

                env = StrictEnvironment()

                for key, raw in context["cookiecutter"].items():
                    if key in options:
                        val = options[key]
                    else:
                        if not isinstance(raw, str):
                            raw = str(raw)
                        val = env.from_string(raw).render(cookiecutter=cookiecutter_dict)

                        if not no_input:
                            val = click.prompt(key, default=val)

                    cookiecutter_dict[key] = val
                return cookiecutter_dict

            try:
                cookiecutter.main.prompt_for_config = custom_prompt_for_config
                yield
            finally:
                cookiecutter.main.prompt_for_config = original_prompt_for_config

        @click.command("new")
        @click.option("--name", "-n", help="The name of the plugin")
        @click.option("--package", "-p", help="The plugin package")
        @click.option("--author", "-a", help="The plugin author's name")
        @click.option("--email", "-e", help="The plugin author's mail address")
        @click.option("--license", "-l", help="The plugin's license")
        @click.option("--description", "-d", help="The plugin's description")
        @click.option("--homepage", help="The plugin's homepage URL")
        @click.option("--source", "-s", help="The URL to the plugin's source")
        @click.option("--installurl", "-i", help="The plugin's install URL")
        @click.argument("identifier", required=False)
        def command(
            name,
            package,
            author,
            email,
            description,
            license,
            homepage,
            source,
            installurl,
            identifier,
        ):
            """Creates a new plugin based on the OctoPrint Plugin cookiecutter template."""
            from octoprint.util import tempdir

            # deleting a git checkout folder might run into access errors due
            # to write-protected sub folders, so we use a custom onerror handler
            # that tries to fix such permissions
            def onerror(func, path, exc_info):
                """Originally from http://stackoverflow.com/a/2656405/2028598"""
                import os
                import stat

                if not os.access(path, os.W_OK):
                    os.chmod(path, stat.S_IWUSR)
                    func(path)
                else:
                    raise

            with tempdir(onerror=onerror) as path:
                custom = {"cookiecutters_dir": path}
                with custom_cookiecutter_config(custom):
                    raw_options = {
                        "plugin_identifier": identifier,
                        "plugin_package": package,
                        "plugin_name": name,
                        "full_name": author,
                        "email": email,
                        "plugin_description": description,
                        "plugin_license": license,
                        "plugin_homepage": homepage,
                        "plugin_source": source,
                        "plugin_installurl": installurl,
                    }
                    options = {k: v for k, v in raw_options.items() if v is not None}

                    with custom_cookiecutter_prompt(options):
                        cookiecutter.main.cookiecutter(
                            "gh:OctoPrint/cookiecutter-octoprint-plugin"
                        )

        return command

    def plugin_install(self):
        @click.command("install")
        @click.option(
            "--path", help="Path of the local plugin development folder to install"
        )
        def command(path):
            """
            Installs the local plugin in development mode.

            Note: This can NOT be used to install plugins from remote locations
            such as the plugin repository! It is strictly for local development
            of plugins, to ensure the plugin is installed (editable) into the
            same python environment that OctoPrint is installed under.
            """

            import os

            if not path:
                path = os.getcwd()

            # check if this really looks like a plugin
            if not os.path.isfile(os.path.join(path, "setup.py")):
                click.echo("This doesn't look like an OctoPrint plugin folder")
                sys.exit(1)

            self.command_caller.call(
                [sys.executable, "-m", "pip", "install", "-e", "."], cwd=path
            )

        return command

    def plugin_uninstall(self):
        @click.command("uninstall")
        @click.argument("name")
        def command(name):
            """Uninstalls the plugin with the given name."""

            lower_name = name.lower()
            if not lower_name.startswith("octoprint_") and not lower_name.startswith(
                "octoprint-"
            ):
                click.echo("This doesn't look like an OctoPrint plugin name")
                sys.exit(1)

            call = [sys.executable, "-m", "pip", "uninstall", "--yes", name]
            self.command_caller.call(call)

        return command

    def css_build(self):
        @click.command("build")
        @click.option(
            "--file",
            "-f",
            "files",
            multiple=True,
            help="Specify files to build, for a list of options use --list",
        )
        @click.option("--all", "all_files", is_flag=True, help="Build all less files")
        @click.option(
            "--list", "list_files", is_flag=True, help="List all available files and exit"
        )
        def command(files, all_files, list_files):
            import os.path
            import shutil

            available_files = {
                "core": {
                    "source": "static/less/octoprint.less",
                    "output": "static/css/octoprint.css",
                },
                "login": {
                    "source": "static/less/login.less",
                    "output": "static/css/login.css",
                },
                "recovery": {
                    "source": "static/less/recovery.less",
                    "output": "static/css/recovery.css",
                },
                "plugin_announcements": {
                    "source": "plugins/announcements/static/less/announcements.less",
                    "output": "plugins/announcements/static/css/announcements.css",
                },
                "plugin_appkeys_core": {
                    "source": "plugins/appkeys/static/less/appkeys.less",
                    "output": "plugins/appkeys/static/css/appkeys.css",
                },
                "plugin_appkeys_authdialog": {
                    "source": "plugins/appkeys/static/less/authdialog.less",
                    "output": "plugins/appkeys/static/css/authdialog.css",
                },
                "plugin_backup": {
                    "source": "plugins/backup/static/less/backup.less",
                    "output": "plugins/backup/static/css/backup.css",
                },
                "plugin_gcodeviewer": {
                    "source": "plugins/gcodeviewer/static/less/gcodeviewer.less",
                    "output": "plugins/gcodeviewer/static/css/gcodeviewer.css",
                },
                "plugin_logging": {
                    "source": "plugins/logging/static/less/logging.less",
                    "output": "plugins/logging/static/css/logging.css",
                },
                "plugin_pluginmanager": {
                    "source": "plugins/pluginmanager/static/less/pluginmanager.less",
                    "output": "plugins/pluginmanager/static/css/pluginmanager.css",
                },
                "plugin_softwareupdate": {
                    "source": "plugins/softwareupdate/static/less/softwareupdate.less",
                    "output": "plugins/softwareupdate/static/css/softwareupdate.css",
                },
            }

            if list_files:
                click.echo("Available files to build:")
                for name in available_files.keys():
                    click.echo(f"- {name}")
                sys.exit(0)

            if all_files:
                files = available_files.keys()

            if not files:
                click.echo(
                    "No files specified. Use `--file <file>` to specify individual files, or `--all` to build all."
                )
                sys.exit(1)

            # Check that lessc is installed
            less = shutil.which("lessc")

            if not less:
                click.echo(
                    "lessc is not installed/not available, please install it first"
                )
                click.echo(
                    "Try `npm i -g less` to install it (NOT lessc in this command!)"
                )
                sys.exit(1)

            # Find the folder of the `octoprint` package
            # Two folders up from this file
            octoprint = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))

            for file in files:
                if file not in available_files.keys():
                    click.echo(f"Unknown file {file}")
                    sys.exit(1)

                source_path = os.path.join(octoprint, available_files[file]["source"])
                output_path = os.path.join(octoprint, available_files[file]["output"])

                # Check the target file exists
                if not os.path.exists(source_path):
                    click.echo(f"Target file {source_path} does not exist")
                    continue

                # Build command line, with necessary options
                # TODO -x is deprecated, find replacement?
                less_command = [less, "-x", source_path, output_path]

                self.command_caller.call(less_command)

        return command


@click.group(cls=OctoPrintDevelCommands)
def cli():
    """Additional commands for development tasks."""
    pass