import os

from typing import Dict
from typing import List
from typing import cast

from cleo.helpers import argument
from cleo.helpers import option

from poetry.console.application import Application
from poetry.console.commands.init import InitCommand
from poetry.console.commands.update import UpdateCommand


class PluginAddCommand(InitCommand):

    name = "plugin add"

    description = "Adds new plugins."

    arguments = [
        argument("plugins", "The names of the plugins to install.", multiple=True),
    ]

    options = [
        option(
            "dry-run",
            None,
            "Output the operations but do not execute anything (implicitly enables"
            " --verbose).",
        )
    ]

    help = """
The <c1>plugin add</c1> command installs Poetry plugins globally.

It works similarly to the <c1>add</c1> command:

If you do not specify a version constraint, poetry will choose a suitable one based on\
 the available package versions.

You can specify a package in the following forms:

  - A single name (<b>requests</b>)
  - A name and a constraint (<b>requests@^2.23.0</b>)
  - A git url (<b>git+https://github.com/python-poetry/poetry.git</b>)
  - A git url with a revision\
 (<b>git+https://github.com/python-poetry/poetry.git#develop</b>)
  - A git SSH url (<b>git+ssh://github.com/python-poetry/poetry.git</b>)
  - A git SSH url with a revision\
 (<b>git+ssh://github.com/python-poetry/poetry.git#develop</b>)
  - A file path (<b>../my-package/my-package.whl</b>)
  - A directory (<b>../my-package/</b>)
  - A url (<b>https://example.com/packages/my-package-0.1.0.tar.gz</b>)\
"""

    def handle(self) -> int:
        from pathlib import Path

        import tomlkit

        from cleo.io.inputs.string_input import StringInput
        from cleo.io.io import IO
        from poetry.core.pyproject.toml import PyProjectTOML
        from poetry.core.semver.helpers import parse_constraint

        from poetry.factory import Factory
        from poetry.packages.project_package import ProjectPackage
        from poetry.repositories.installed_repository import InstalledRepository
        from poetry.utils.env import EnvManager

        plugins = self.argument("plugins")

        # Plugins should be installed in the system env to be globally available
        system_env = EnvManager.get_system_env(naive=True)

        env_dir = Path(os.getenv("POETRY_HOME") or system_env.path)

        # We check for the plugins existence first.
        if env_dir.joinpath("pyproject.toml").exists():
            pyproject = tomlkit.loads(
                env_dir.joinpath("pyproject.toml").read_text(encoding="utf-8")
            )
            poetry_content = pyproject["tool"]["poetry"]
            existing_packages = self.get_existing_packages_from_input(
                plugins, poetry_content, "dependencies"
            )

            if existing_packages:
                self.notify_about_existing_packages(existing_packages)

            plugins = [plugin for plugin in plugins if plugin not in existing_packages]

        if not plugins:
            return 0

        plugins = self._determine_requirements(plugins)

        # We retrieve the packages installed in the system environment.
        # We assume that this environment will be a self contained virtual environment
        # built by the official installer or by pipx.
        # If not, it might lead to side effects since other installed packages might not
        # be required by Poetry but still be taken into account when resolving
        # dependencies.
        installed_repository = InstalledRepository.load(
            system_env, with_dependencies=True
        )

        root_package = None
        for package in installed_repository.packages:
            if package.name == "poetry":
                root_package = ProjectPackage(package.name, package.version)
                for dependency in package.requires:
                    root_package.add_dependency(dependency)

                break

        root_package.python_versions = ".".join(
            str(v) for v in system_env.version_info[:3]
        )
        # We create a `pyproject.toml` file based on all the information
        # we have about the current environment.
        if not env_dir.joinpath("pyproject.toml").exists():
            Factory.create_pyproject_from_package(root_package, env_dir)

        # We add the plugins to the dependencies section of the previously
        # created `pyproject.toml` file
        pyproject = PyProjectTOML(env_dir.joinpath("pyproject.toml"))
        poetry_content = pyproject.poetry_config
        poetry_dependency_section = poetry_content["dependencies"]
        plugin_names = []
        for plugin in plugins:
            if "version" in plugin:
                # Validate version constraint
                parse_constraint(plugin["version"])

            constraint = tomlkit.inline_table()
            for name, value in plugin.items():
                if name == "name":
                    continue

                constraint[name] = value

            if len(constraint) == 1 and "version" in constraint:
                constraint = constraint["version"]

            poetry_dependency_section[plugin["name"]] = constraint
            plugin_names.append(plugin["name"])

        pyproject.save()

        # From this point forward, all the logic will be deferred to
        # the update command, by using the previously created `pyproject.toml`
        # file.
        application = cast(Application, self.application)
        update_command: UpdateCommand = cast(UpdateCommand, application.find("update"))
        # We won't go through the event dispatching done by the application
        # so we need to configure the command manually
        update_command.set_poetry(Factory().create_poetry(env_dir))
        update_command.set_env(system_env)
        application._configure_installer(update_command, self._io)

        argv = ["update"] + plugin_names
        if self.option("dry-run"):
            argv.append("--dry-run")

        return update_command.run(
            IO(
                StringInput(" ".join(argv)),
                self._io.output,
                self._io.error_output,
            )
        )

    def get_existing_packages_from_input(
        self, packages: List[str], poetry_content: Dict, target_section: str
    ) -> List[str]:
        existing_packages = []

        for name in packages:
            for key in poetry_content[target_section]:
                if key.lower() == name.lower():
                    existing_packages.append(name)

        return existing_packages

    def notify_about_existing_packages(self, existing_packages: List[str]) -> None:
        self.line(
            "The following plugins are already present in the "
            "<c2>pyproject.toml</c2> file and will be skipped:\n"
        )
        for name in existing_packages:
            self.line(f"  • <c1>{name}</c1>")

        self.line(
            "\nIf you want to update it to the latest compatible version, "
            "you can use `<c2>poetry plugin update package</c2>`.\n"
            "If you prefer to upgrade it to the latest available version, "
            "you can use `<c2>poetry plugin add package@latest</c2>`.\n"
        )
