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"""Command line tools for manipulating a Kedro project.
Intended to be invoked via `kedro`."""
import os
import re
import shutil
import subprocess
import sys
import webbrowser
from collections import Counter
from glob import iglob
from itertools import chain
from pathlib import Path
from typing import Any, Dict, Iterable, List, Tuple

import anyconfig
import click
from click import secho, style
from kedro.cli import main as kedro_main
from kedro.cli.utils import (
    KedroCliError,
    call,
    export_nodes,
    forward_command,
    python_call,
)
from kedro.context import KEDRO_ENV_VAR, load_context
from kedro.runner import SequentialRunner
from kedro.utils import load_obj

CONTEXT_SETTINGS = dict(help_option_names=["-h", "--help"])

# get our package onto the python path
PROJ_PATH = Path(__file__).resolve().parent
os.environ["IPYTHONDIR"] = str(PROJ_PATH / ".ipython")


NO_DEPENDENCY_MESSAGE = """{0} is not installed. Please make sure {0} is in
src/requirements.txt and run `kedro install`."""

TAG_ARG_HELP = """Construct the pipeline using only nodes which have this tag
attached. Option can be used multiple times, what results in a
pipeline constructed from nodes having any of those tags."""

PIPELINE_ARG_HELP = """Name of the modular pipeline to run.
If not set, the project pipeline is run by default."""

ENV_ARG_HELP = """Run the pipeline in a configured environment. If not specified,
pipeline will run using environment `local`."""

NODE_ARG_HELP = """Run only nodes with specified names."""

FROM_NODES_HELP = """A list of node names which should be used as a starting point."""

TO_NODES_HELP = """A list of node names which should be used as an end point."""

FROM_INPUTS_HELP = (
    """A list of dataset names which should be used as a starting point."""
)

PARALLEL_ARG_HELP = """Run the pipeline using the `ParallelRunner`.
If not specified, use the `SequentialRunner`. This flag cannot be used together
with --runner."""

OPEN_ARG_HELP = """Open the documentation in your default browser after building."""

RUNNER_ARG_HELP = """Specify a runner that you want to run the pipeline with.
This option cannot be used together with --parallel."""

CONVERT_ALL_HELP = """Extract the nodes from all notebooks in the Kedro project directory,
including sub-folders."""

OVERWRITE_HELP = """If Python file already exists for the equivalent notebook,
overwrite its contents."""

LOAD_VERSION_HELP = """Specify a particular dataset version (timestamp) for loading."""

CONFIG_FILE_HELP = """Specify a YAML configuration file to load the run
command arguments from. If command line arguments are provided, they will
override the loaded ones."""

PARAMS_ARG_HELP = """Specify extra parameters that you want to pass
to the context initializer. Items must be separated by comma, keys - by colon,
example: param1:value1,param2:value2. Each parameter is split by the first comma,
so parameter values are allowed to contain colons, parameter keys are not."""

JUPYTER_IP_HELP = "IP address of the Jupyter server."
JUPYTER_ALL_KERNELS_HELP = "Display all available Python kernels."
JUPYTER_IDLE_TIMEOUT_HELP = """When a notebook is closed, Jupyter server will
terminate its kernel after so many seconds of inactivity. This does not affect
any open notebooks."""


def _split_string(ctx, param, value):
    return [item for item in value.split(",") if item]


def _try_convert_to_numeric(value):
    try:
        value = float(value)
    except ValueError:
        return value
    return int(value) if value.is_integer() else value


def _split_params(ctx, param, value):
    if isinstance(value, dict):
        return value
    result = {}
    for item in _split_string(ctx, param, value):
        item = item.split(":", 1)
        if len(item) != 2:
            ctx.fail(
                "Invalid format of `{}` option: Item `{}` must contain a key and "
                "a value separated by `:`.".format(param.name, item[0])
            )
        key = item[0].strip()
        if not key:
            ctx.fail(
                "Invalid format of `{}` option: Parameter key cannot be "
                "an empty string.".format(param.name)
            )
        value = item[1].strip()
        result[key] = _try_convert_to_numeric(value)
    return result


def _reformat_load_versions(ctx, param, value) -> Dict[str, str]:
    """Reformat data structure from tuple to dictionary for `load-version`.
        E.g ('dataset1:time1', 'dataset2:time2') -> {"dataset1": "time1", "dataset2": "time2"}.
    """
    load_version_separator = ":"
    load_versions_dict = {}

    for load_version in value:
        load_version_list = load_version.split(load_version_separator, 1)
        if len(load_version_list) != 2:
            raise ValueError(
                "Expected the form of `load_version` to be "
                "`dataset_name:YYYY-MM-DDThh.mm.ss.sssZ`,"
                "found {} instead".format(load_version)
            )
        load_versions_dict[load_version_list[0]] = load_version_list[1]

    return load_versions_dict


def _config_file_callback(ctx, param, value):
    """Config file callback, that replaces command line options with config file
    values. If command line options are passed, they override config file values.
    """
    ctx.default_map = ctx.default_map or {}
    section = ctx.info_name

    if value:
        config = anyconfig.load(value)[section]
        ctx.default_map.update(config)

    return value


def _get_values_as_tuple(values: Iterable[str]) -> Tuple[str]:
    return tuple(chain.from_iterable(value.split(",") for value in values))


@click.group(context_settings=CONTEXT_SETTINGS, name=__file__)
def cli():
    """Command line tools for manipulating a Kedro project."""


@cli.command()
@click.option(
    "--from-inputs", type=str, default="", help=FROM_INPUTS_HELP, callback=_split_string
)
@click.option(
    "--from-nodes", type=str, default="", help=FROM_NODES_HELP, callback=_split_string
)
@click.option(
    "--to-nodes", type=str, default="", help=TO_NODES_HELP, callback=_split_string
)
@click.option("--node", "-n", "node_names", type=str, multiple=True, help=NODE_ARG_HELP)
@click.option(
    "--runner", "-r", type=str, default=None, multiple=False, help=RUNNER_ARG_HELP
)
@click.option("--parallel", "-p", is_flag=True, multiple=False, help=PARALLEL_ARG_HELP)
@click.option(
    "--env",
    "-e",
    type=str,
    default=None,
    multiple=False,
    envvar=KEDRO_ENV_VAR,
    help=ENV_ARG_HELP,
)
@click.option("--tag", "-t", type=str, multiple=True, help=TAG_ARG_HELP)
@click.option(
    "--load-version",
    "-lv",
    type=str,
    multiple=True,
    help=LOAD_VERSION_HELP,
    callback=_reformat_load_versions,
)
@click.option("--pipeline", type=str, default=None, help=PIPELINE_ARG_HELP)
@click.option(
    "--config",
    "-c",
    type=click.Path(exists=True, dir_okay=False, resolve_path=True),
    help=CONFIG_FILE_HELP,
    callback=_config_file_callback,
)
@click.option(
    "--params", type=str, default="", help=PARAMS_ARG_HELP, callback=_split_params
)
def run(
    tag,
    env,
    parallel,
    runner,
    node_names,
    to_nodes,
    from_nodes,
    from_inputs,
    load_version,
    pipeline,
    config,
    params,
):
    """Run the pipeline."""
    if parallel and runner:
        raise KedroCliError(
            "Both --parallel and --runner options cannot be used together. "
            "Please use either --parallel or --runner."
        )
    if parallel:
        runner = "ParallelRunner"
    runner_class = load_obj(runner, "kedro.runner") if runner else SequentialRunner

    tag = _get_values_as_tuple(tag) if tag else tag
    node_names = _get_values_as_tuple(node_names) if node_names else node_names

    context = load_context(Path.cwd(), env=env, extra_params=params)
    context.run(
        tags=tag,
        runner=runner_class(),
        node_names=node_names,
        from_nodes=from_nodes,
        to_nodes=to_nodes,
        from_inputs=from_inputs,
        load_versions=load_version,
        pipeline_name=pipeline,
    )


@forward_command(cli, forward_help=True)
def test(args):
    """Run the test suite."""
    try:
        import pytest  # pylint: disable=unused-import
    except ImportError:
        raise KedroCliError(NO_DEPENDENCY_MESSAGE.format("pytest"))
    else:
        python_call("pytest", args)


@cli.command()
@click.argument("files", type=click.Path(exists=True), nargs=-1)
def lint(files):
    """Run flake8, isort and (on Python >=3.6) black."""
    # pylint: disable=unused-import
    if not files:
        files = ("src/tests", "src/default_kedro_157")

    try:
        import flake8
        import isort
    except ImportError as exc:
        raise KedroCliError(NO_DEPENDENCY_MESSAGE.format(exc.name))

    python_call("flake8", ("--max-line-length=88",) + files)
    python_call("isort", ("-rc", "-tc", "-up", "-fgw=0", "-m=3", "-w=88") + files)

    if sys.version_info[:2] >= (3, 6):
        try:
            import black
        except ImportError:
            raise KedroCliError(NO_DEPENDENCY_MESSAGE.format("black"))
        python_call("black", files)


@cli.command()
def install():
    """Install project dependencies from both requirements.txt
    and environment.yml (optional)."""

    if (Path.cwd() / "src" / "environment.yml").is_file():
        call(["conda", "install", "--file", "src/environment.yml", "--yes"])

    pip_command = ["install", "-U", "-r", "src/requirements.txt"]

    if os.name == "posix":
        python_call("pip", pip_command)
    else:
        command = [sys.executable, "-m", "pip"] + pip_command
        subprocess.Popen(command, creationflags=subprocess.CREATE_NEW_CONSOLE)


@forward_command(cli, forward_help=True)
def ipython(args):
    """Open IPython with project specific variables loaded."""
    if "-h" not in args and "--help" not in args:
        ipython_message()
    call(["ipython"] + list(args))


@cli.command()
def package():
    """Package the project as a Python egg and wheel."""
    call([sys.executable, "setup.py", "clean", "--all", "bdist_egg"], cwd="src")
    call([sys.executable, "setup.py", "clean", "--all", "bdist_wheel"], cwd="src")


@cli.command("build-docs")
@click.option(
    "--open",
    "-o",
    "open_docs",
    is_flag=True,
    multiple=False,
    default=False,
    help=OPEN_ARG_HELP,
)
def build_docs(open_docs):
    """Build the project documentation."""
    python_call("pip", ["install", "src/[docs]"])
    python_call("pip", ["install", "-r", "src/requirements.txt"])
    python_call("ipykernel", ["install", "--user", "--name=default_kedro_157"])
    shutil.rmtree("docs/build", ignore_errors=True)
    call(
        [
            "sphinx-apidoc",
            "--module-first",
            "-o",
            "docs/source",
            "src/default_kedro_157",
        ]
    )
    call(["sphinx-build", "-M", "html", "docs/source", "docs/build", "-a"])
    if open_docs:
        docs_page = (Path.cwd() / "docs" / "build" / "html" / "index.html").as_uri()
        secho("Opening {}".format(docs_page))
        webbrowser.open(docs_page)


@cli.command("build-reqs")
def build_reqs():
    """Build the project dependency requirements."""
    requirements_path = Path.cwd() / "src" / "requirements.in"
    if not requirements_path.is_file():
        secho("No requirements.in found. Copying contents from requirements.txt...")
        contents = (Path.cwd() / "src" / "requirements.txt").read_text()
        requirements_path.write_text(contents)
    python_call("piptools", ["compile", str(requirements_path)])
    secho(
        (
            "Requirements built! Please update requirements.in "
            "if you'd like to make a change in your project's dependencies, "
            "and re-run build-reqs to generate the new requirements.txt."
        )
    )


@cli.command("activate-nbstripout")
def activate_nbstripout():
    """Install the nbstripout git hook to automatically clean notebooks."""
    secho(
        (
            "Notebook output cells will be automatically cleared before committing"
            " to git."
        ),
        fg="yellow",
    )

    try:
        import nbstripout  # pylint: disable=unused-import
    except ImportError:
        raise KedroCliError(NO_DEPENDENCY_MESSAGE.format("nbstripout"))

    try:
        res = subprocess.run(
            ["git", "rev-parse", "--git-dir"],
            stdout=subprocess.PIPE,
            stderr=subprocess.PIPE,
        )
        if res.returncode:
            raise KedroCliError("Not a git repository. Run `git init` first.")
    except FileNotFoundError:
        raise KedroCliError("Git executable not found. Install Git first.")

    call(["nbstripout", "--install"])


def _build_jupyter_command(
    base: str, ip: str, all_kernels: bool, args: Iterable[str], idle_timeout: int
) -> List[str]:
    cmd = [
        base,
        "--ip",
        ip,
        "--MappingKernelManager.cull_idle_timeout={}".format(idle_timeout),
        "--MappingKernelManager.cull_interval={}".format(idle_timeout),
    ]

    if not all_kernels:
        project_name = "Default Kedro 157"
        kernel_name = re.sub(r"[^\w]+", "", project_name).strip() or "Kedro"

        cmd += [
            "--NotebookApp.kernel_spec_manager_class="
            "kedro.cli.jupyter.SingleKernelSpecManager",
            "--KernelSpecManager.default_kernel_name='{}'".format(kernel_name),
        ]

    return cmd + list(args)


def _build_jupyter_env(kedro_env: str) -> Dict[str, Any]:
    """Build the environment dictionary that gets injected into the subprocess running
    Jupyter. Since the subprocess has access only to the environment variables passed
    in, we need to copy the current environment and add ``KEDRO_ENV_VAR``.
    """
    if not kedro_env:
        return {}
    jupyter_env = os.environ.copy()
    jupyter_env[KEDRO_ENV_VAR] = kedro_env
    return {"env": jupyter_env}


@cli.group()
def jupyter():
    """Open Jupyter Notebook / Lab with project specific variables loaded, or
    convert notebooks into Kedro code.
    """


@forward_command(jupyter, "notebook", forward_help=True)
@click.option("--ip", type=str, default="127.0.0.1", help=JUPYTER_IP_HELP)
@click.option(
    "--all-kernels", is_flag=True, default=False, help=JUPYTER_ALL_KERNELS_HELP
)
@click.option("--idle-timeout", type=int, default=30, help=JUPYTER_IDLE_TIMEOUT_HELP)
@click.option(
    "--env",
    "-e",
    type=str,
    default=None,
    multiple=False,
    envvar=KEDRO_ENV_VAR,
    help=ENV_ARG_HELP,
)
def jupyter_notebook(ip, all_kernels, env, idle_timeout, args):
    """Open Jupyter Notebook with project specific variables loaded."""
    if "-h" not in args and "--help" not in args:
        ipython_message(all_kernels)

    arguments = _build_jupyter_command(
        "notebook", ip=ip, all_kernels=all_kernels, args=args, idle_timeout=idle_timeout
    )

    python_call_kwargs = _build_jupyter_env(env)
    python_call("jupyter", arguments, **python_call_kwargs)


@forward_command(jupyter, "lab", forward_help=True)
@click.option("--ip", type=str, default="127.0.0.1", help=JUPYTER_IP_HELP)
@click.option(
    "--all-kernels", is_flag=True, default=False, help=JUPYTER_ALL_KERNELS_HELP
)
@click.option("--idle-timeout", type=int, default=30, help=JUPYTER_IDLE_TIMEOUT_HELP)
@click.option(
    "--env",
    "-e",
    type=str,
    default=None,
    multiple=False,
    envvar=KEDRO_ENV_VAR,
    help=ENV_ARG_HELP,
)
def jupyter_lab(ip, all_kernels, env, idle_timeout, args):
    """Open Jupyter Lab with project specific variables loaded."""
    if "-h" not in args and "--help" not in args:
        ipython_message(all_kernels)

    arguments = _build_jupyter_command(
        "lab", ip=ip, all_kernels=all_kernels, args=args, idle_timeout=idle_timeout
    )

    python_call_kwargs = _build_jupyter_env(env)
    python_call("jupyter", arguments, **python_call_kwargs)


@jupyter.command("convert")
@click.option("--all", "all_flag", is_flag=True, help=CONVERT_ALL_HELP)
@click.option("-y", "overwrite_flag", is_flag=True, help=OVERWRITE_HELP)
@click.argument(
    "filepath",
    type=click.Path(exists=True, dir_okay=False, resolve_path=True),
    required=False,
    nargs=-1,
)
def convert_notebook(all_flag, overwrite_flag, filepath):
    """Convert selected or all notebooks found in a Kedro project
    to Kedro code, by exporting code from the appropriately-tagged cells:
    Cells tagged as `node` will be copied over to a Python file matching
    the name of the notebook, under `src/<package_name>/nodes`.
    *Note*: Make sure your notebooks have unique names!
    FILEPATH: Path(s) to exact notebook file(s) to be converted. Both
    relative and absolute paths are accepted.
    Should not be provided if --all flag is already present.
    """
    context = load_context(Path.cwd())

    if not filepath and not all_flag:
        secho(
            "Please specify a notebook filepath "
            "or add '--all' to convert all notebooks."
        )
        sys.exit(1)

    kedro_project_path = context.project_path
    kedro_package_name = "default_kedro_157"

    if all_flag:
        # pathlib glob does not ignore hidden directories,
        # whereas Python glob does, which is more useful in
        # ensuring checkpoints will not be included
        pattern = kedro_project_path / "**" / "*.ipynb"
        notebooks = sorted(Path(p) for p in iglob(str(pattern), recursive=True))
    else:
        notebooks = [Path(f) for f in filepath]

    counter = Counter(n.stem for n in notebooks)
    non_unique_names = [name for name, counts in counter.items() if counts > 1]
    if non_unique_names:
        raise KedroCliError(
            "Found non-unique notebook names! "
            "Please rename the following: {}".format(", ".join(non_unique_names))
        )

    for notebook in notebooks:
        secho("Converting notebook '{}'...".format(str(notebook)))
        output_path = (
            kedro_project_path
            / "src"
            / kedro_package_name
            / "nodes"
            / "{}.py".format(notebook.stem)
        )

        if output_path.is_file():
            overwrite = overwrite_flag or click.confirm(
                "Output file {} already exists. Overwrite?".format(str(output_path)),
                default=False,
            )
            if overwrite:
                export_nodes(notebook, output_path)
        else:
            export_nodes(notebook, output_path)

    secho("Done!")


def ipython_message(all_kernels=True):
    """Show a message saying how we have configured the IPython env."""
    ipy_vars = ["startup_error", "context"]
    secho("-" * 79, fg="cyan")
    secho("Starting a Kedro session with the following variables in scope")
    secho(", ".join(ipy_vars), fg="green")
    secho(
        "Use the line magic {} to refresh them".format(
            style("%reload_kedro", fg="green")
        )
    )
    secho("or to see the error message if they are undefined")

    if not all_kernels:
        secho("The choice of kernels is limited to the default one.", fg="yellow")
        secho("(restart with --all-kernels to get access to others)", fg="yellow")

    secho("-" * 79, fg="cyan")


if __name__ == "__main__":
    os.chdir(str(PROJ_PATH))
    kedro_main()