from typing import Optional, Dict, Any, Union, List
import platform
from pathlib import Path
from wasabi import Printer, MarkdownRenderer
import srsly

from ._util import app, Arg, Opt, string_to_list
from .. import util
from .. import about


@app.command("info")
def info_cli(
    # fmt: off
    model: Optional[str] = Arg(None, help="Optional loadable spaCy pipeline"),
    markdown: bool = Opt(False, "--markdown", "-md", help="Generate Markdown for GitHub issues"),
    silent: bool = Opt(False, "--silent", "-s", "-S", help="Don't print anything (just return)"),
    exclude: Optional[str] = Opt("labels", "--exclude", "-e", help="Comma-separated keys to exclude from the print-out"),
    # fmt: on
):
    """
    Print info about spaCy installation. If a pipeline is speficied as an argument,
    print its meta information. Flag --markdown prints details in Markdown for easy
    copy-pasting to GitHub issues.

    DOCS: https://nightly.spacy.io/api/cli#info
    """
    exclude = string_to_list(exclude)
    info(model, markdown=markdown, silent=silent, exclude=exclude)


def info(
    model: Optional[str] = None, *, markdown: bool = False, silent: bool = True, exclude: List[str]
) -> Union[str, dict]:
    msg = Printer(no_print=silent, pretty=not silent)
    if model:
        title = f"Info about pipeline '{model}'"
        data = info_model(model, silent=silent)
    else:
        title = "Info about spaCy"
        data = info_spacy()
    raw_data = {k.lower().replace(" ", "_"): v for k, v in data.items()}
    if "Pipelines" in data and isinstance(data["Pipelines"], dict):
        data["Pipelines"] = ", ".join(
            f"{n} ({v})" for n, v in data["Pipelines"].items()
        )
    markdown_data = get_markdown(data, title=title, exclude=exclude)
    if markdown:
        if not silent:
            print(markdown_data)
        return markdown_data
    if not silent:
        table_data = {k: v for k, v in data.items() if k not in exclude}
        msg.table(table_data, title=title)
    return raw_data


def info_spacy() -> Dict[str, any]:
    """Generate info about the current spaCy intallation.

    RETURNS (dict): The spaCy info.
    """
    all_models = {}
    for pkg_name in util.get_installed_models():
        package = pkg_name.replace("-", "_")
        all_models[package] = util.get_package_version(pkg_name)
    return {
        "spaCy version": about.__version__,
        "Location": str(Path(__file__).parent.parent),
        "Platform": platform.platform(),
        "Python version": platform.python_version(),
        "Pipelines": all_models,
    }


def info_model(model: str, *, silent: bool = True) -> Dict[str, Any]:
    """Generate info about a specific model.

    model (str): Model name of path.
    silent (bool): Don't print anything, just return.
    RETURNS (dict): The model meta.
    """
    msg = Printer(no_print=silent, pretty=not silent)
    if util.is_package(model):
        model_path = util.get_package_path(model)
    else:
        model_path = Path(model)
    meta_path = model_path / "meta.json"
    if not meta_path.is_file():
        msg.fail("Can't find pipeline meta.json", meta_path, exits=1)
    meta = srsly.read_json(meta_path)
    if model_path.resolve() != model_path:
        meta["source"] = str(model_path.resolve())
    else:
        meta["source"] = str(model_path)
    return {
        k: v for k, v in meta.items() if k not in ("accuracy", "performance", "speed")
    }


def get_markdown(data: Dict[str, Any], title: Optional[str] = None, exclude: List[str] = None) -> str:
    """Get data in GitHub-flavoured Markdown format for issues etc.

    data (dict or list of tuples): Label/value pairs.
    title (str / None): Title, will be rendered as headline 2.
    RETURNS (str): The Markdown string.
    """
    md = MarkdownRenderer()
    if title:
        md.add(md.title(2, title))
    items = []
    for key, value in data.items():
        if exclude and key in exclude:
            continue
        if isinstance(value, str):
            try:
                existing_path = Path(value).exists()
            except:
                # invalid Path, like a URL string
                existing_path = False
            if existing_path:
                continue
        items.append(f"{md.bold(f'{key}:')} {value}")
    md.add(md.list(items))
    return f"\n{md.text}\n"