import json
import os
import re
import shutil
import traceback
from datetime import datetime
from pathlib import Path
from textwrap import shorten
from typing import Dict, List, TextIO, Union

from openbb_terminal.core.session.current_system import set_system_variable
from openbb_terminal.core.session.current_user import get_current_user
from openbb_terminal.rich_config import console
from website.controller_doc_classes import (
    ControllerDoc,
    LoadControllersDoc,
    sub_names_full as subnames,
)

set_system_variable("TEST_MODE", True)
set_system_variable("LOG_COLLECT", False)
website_path = Path(__file__).parent.absolute()

reference_import = """
import ReferenceCard from "@site/src/components/General/ReferenceCard";

<ul className="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-3 xl:grid-cols-4 gap-4 -ml-6">
"""

USER_PATH = (
    f"{get_current_user().preferences.USER_DATA_DIRECTORY}",
    "`USER_DATA_DIRECTORY`",
)


def existing_markdown_file_examples(
    trailmap: str, cmd_dict: Dict[str, str]
) -> Dict[str, Union[str, List[str]]]:
    """Get existing markdown file examples

    Parameters
    ----------
    trailmap : str
        The trailmap to the function
    cmd_dict : Dict[str, str]
        The dictionary of the command

    Returns
    -------
    Dict[str, Union[str, List[str]]]
        Updated dictionary of the command with examples and images keys
    """
    trail = trailmap.split(".")
    for sub in trail:
        if sub in ["ba", "ta", "qa"]:
            trail.remove(trailmap.split(".")[0])

    examples_path = (
        f"old_content/terminal/{'/'.join(trail)}/{cmd_dict['cmd_name']}/_index.md"
    )
    examples_dict: Dict[str, Union[str, List[str]]] = {}

    if os.path.exists(website_path / examples_path):
        with open(website_path / examples_path, encoding="utf-8") as f:
            content = f.read()

            examples: str = ""
            if "Example:" in content:
                example_split = content.split("Example:")[1].split("```")
                if example_split and len(example_split) > 1:
                    examples = f"{example_split[1].strip()}"

            examples_dict["example"] = examples
            images = [
                x for x in content.split("\n") if x.startswith("!") and "TODO" not in x
            ]
            examples_dict["images"] = images

    return examples_dict


# pylint: disable=isinstance-second-argument-not-valid-type
def process_cmd_parsers(ctrl: ControllerDoc) -> List[Dict[str, str]]:
    """Process command parsers from ControllerDoc"""

    commands = []
    for cmd, parser in ctrl.cmd_parsers.items():
        actions = []
        for action in parser._actions:  # pylint: disable=protected-access
            if action.dest == "help":
                continue

            if (default := action.default) is not None:
                if isinstance(default, list):
                    default = ", ".join([str(x) for x in default])

                elif isinstance(default, datetime):
                    if "start" in action.dest:
                        default = "datetime.now() - timedelta(days=365)"
                    elif "end" in action.dest or "date" in action.dest:
                        default = "datetime.now()"

            if (choices := action.choices) is not None:
                # We do this so that range(0, N) objects are not converted to a list
                if isinstance(choices, (dict, type({}.keys()), list)):
                    listdict: list = []
                    for choice in choices:
                        # We check for nested dicts
                        if isinstance(choice, (dict, type({}.keys()))):
                            listdict.append([f"{k}" for k in choice])

                    choices = listdict or [f"{x}" for x in choices]
                    choices = ", ".join(choices) if len(choices) > 0 else "None"

                if action.dest == "file":
                    new_desc = "File in `EXPORTS` or `CUSTOM_IMPORTS` directories"

                    if (file_ext := re.compile(r"\.(\w{3,5})").findall(choices)) != []:  # type: ignore
                        exts = set(file_ext)
                        ext_examples = "file_name." + ", file_name.".join(exts)
                        new_desc += f" (e.g: `{ext_examples}`)"
                        action.choices = [f"`{ext_examples}`"]

                    choices = new_desc

            if (doc := action.help) is not None:
                # We do this to fix multiline docstrings for the markdown
                doc = " ".join(doc.split()).replace(*USER_PATH)

            if (flags := action.option_strings) is not None:
                flags = "  ".join(flags)

            actions.append(
                {
                    "opt_name": action.dest if action.dest else "",
                    "flags": flags if flags else "",
                    "doc": doc if doc else "",
                    "default": f"{default}".replace(*USER_PATH),
                    "optional": not action.required,
                    "choices": choices,
                }
            )

        if (desc := parser.description) is not None:
            # We do this to fix multiline docstrings for the markdown
            desc = " ".join(desc.split()).replace(*USER_PATH)

        param = {
            "cmd_name": cmd.replace("call_", ""),
            "actions": actions,
            "usage": " ".join(parser.format_usage().split()).replace("usage: ", ""),
            "description": desc if desc else "",
        }
        commands.append(param)

    return commands  # type: ignore


def generate_markdown(
    cmd_meta: Dict[str, str], examples: Dict[str, Union[str, List[str]]]
) -> str:
    """Generate markdown section

    Parameters
    ----------
    cmd_meta : Dict[str, str]
        Command metadata
    examples : Dict[str, Union[str, List[str]]]
        Command examples

    Returns
    -------
    str
        Markdown string
    """
    if not cmd_meta:
        raise ValueError("No command metadata found")

    markdown = f"""---
########### THIS FILE IS AUTO GENERATED - ANY CHANGES WILL BE VOID ###########
title: {cmd_meta["cmd_name"]}
description: OpenBB Terminal Function
---\n\n"""

    # head meta https://docusaurus.io/docs/markdown-features/head-metadata
    markdown += f"# {cmd_meta['cmd_name']}\n\n{cmd_meta['description']}\n\n"
    markdown += f"### Usage\n\n```python wordwrap\n{cmd_meta['usage']}\n```\n\n"

    markdown += "---\n\n## Parameters\n\n"
    if cmd_meta["actions"]:
        markdown += (
            "| Name | Parameter | Description | Default | Optional | Choices |\n"
        )
        markdown += (
            "| ---- | --------- | ----------- | ------- | -------- | ------- |\n"
        )

        for param in cmd_meta["actions"]:
            if isinstance(param, dict):
                markdown += (
                    f"| {param['opt_name']} | {param['flags']} | {param['doc']} "
                    f"| {param['default']} | {param['optional']} | {param['choices']} |\n"
                )
    else:
        markdown += "This command has no parameters\n\n"

    if examples.get("example", ""):
        markdown += "\n\n---\n\n## Examples\n\n"
        markdown += f"```python\n{examples['example']}\n```"

    markdown += "\n"

    if isinstance(examples.get("images", None), list):
        for image in examples["images"]:
            markdown += f"{image}\n\n"

    markdown += "---\n"
    return markdown.replace("<", "").replace(">", "")


def create_nested_menus_card(folder: Path, url: str) -> str:
    sub_categories = [
        sub.stem
        for sub in folder.glob("**/**/*.md*")
        if sub.is_file() and sub.stem != "index"
    ]
    categories = shorten(", ".join(sub_categories), width=116, placeholder="...")
    url = f"/terminal/reference/{url}/{folder.name}".replace("//", "/")

    index_card = f"""<ReferenceCard
        title="{folder.name}"
        description="{categories}"
        url="{url}"
/>\n"""
    return index_card


def create_cmd_cards(cmd_text: List[Dict[str, str]]) -> str:
    cmd_cards = ""
    for cmd in cmd_text:
        url = f"/terminal/reference/{cmd['url']}/{cmd['title']}".replace("//", "/")
        description = shorten(cmd["description"], width=116, placeholder="...")

        cmd_cards += f"""<ReferenceCard
    title="{cmd["title"]}"
    description="{description.replace('"', "'")}"
    url="{url}"
    command="true"
/>\n"""
    return cmd_cards


def write_reference_index(
    reference_cards: Dict[Path, List[Dict[str, str]]],
    fname: str,
    path: Path,
    rel_path: Path,
    f: TextIO,
) -> None:
    """Write to the corresponding index.mdx file for a given folder, with the
    appropriate nested menus and command cards.

    Parameters
    ----------
    reference_cards : Dict[Path, List[Dict[str, str]]]
        Dictionary of command cards to be written to the index.md file.
    fname : str
        Name of the index.md file.
    path : Path
        Path to the folder to be written.
    rel_path : Path
        Relative path to the folder to be written.
    f : TextIO
        File to write to.
    """
    f.write(f"# {fname}\n{reference_import}")
    for folder in path.glob("*"):
        if folder.is_dir():
            f.write(create_nested_menus_card(folder, "/".join(rel_path.parts)))

    folder_cmd_cards: List[Dict[str, str]] = reference_cards.get(path, {})  # type: ignore
    if folder_cmd_cards:
        f.write(create_cmd_cards(folder_cmd_cards))

    f.write("</ul>\n")


def main() -> bool:
    """Main function to generate markdown files"""
    console.print(
        "[bright_yellow]Loading Controllers... Please wait and ignore any errors, this is normal.[/bright_yellow]"
    )

    load_ctrls = LoadControllersDoc()
    ctrls = load_ctrls.available_controllers()
    wopen_kwargs = {"encoding": "utf-8", "newline": "\n"}

    console.print(
        "[bright_yellow]Generating markdown files... Don't ignore any errors now[/bright_yellow]"
    )
    content_path: Path = website_path / "content/terminal/reference"
    reference_cards: Dict[Path, List[Dict[str, str]]] = {}

    for file in content_path.glob("*"):
        if file.is_file():
            file.unlink()
        else:
            shutil.rmtree(file)

    for ctrl_trailmap in ctrls:
        try:
            ctrl = load_ctrls.get_controller_doc(ctrl_trailmap)
            ctrl_cmds = process_cmd_parsers(ctrl)

            for cmd in ctrl_cmds:
                examples = existing_markdown_file_examples(ctrl_trailmap, cmd)
                markdown = generate_markdown(cmd, examples)

                if cmd["cmd_name"] == "index":
                    cmd["cmd_name"] = "index_cmd"

                trail = ctrl_trailmap.split(".")

                filepath = content_path / f"{'/'.join(trail)}/{cmd['cmd_name']}.md"
                reference_cards.setdefault(filepath.parent, []).append(
                    dict(
                        title=cmd["cmd_name"],
                        description=cmd["description"],
                        url="/".join(trail),
                    )
                )
                filepath.parent.mkdir(parents=True, exist_ok=True)
                with open(filepath, "w", **wopen_kwargs) as f:  # type: ignore
                    f.write(markdown)

        except Exception as e:
            traceback.print_exc()
            console.print(
                f"[red]Failed to generate markdown for {ctrl_trailmap}: {e}[/red]"
            )
            return False

    # Sort reference_cards
    reference_cards = dict(sorted(reference_cards.items(), key=lambda item: item[0]))

    # Generate root "_category_.json" file
    with open(content_path / "_category_.json", "w", **wopen_kwargs) as f:  # type: ignore
        f.write(json.dumps({"label": "Terminal Reference", "position": 4}, indent=2))

    # Generate root "index.md" file
    with open(content_path / "index.mdx", "w", **wopen_kwargs) as f:  # type: ignore
        fname = "OpenBB Terminal Features"
        rel_path = content_path.relative_to(content_path)
        write_reference_index(reference_cards, fname, content_path, rel_path, f)

    def gen_category_json(fname: str, path: Path):
        """Generate category json"""
        fname = subnames[fname.lower()] if fname.lower() in subnames else fname.title()
        with open(path / "_category_.json", "w", **wopen_kwargs) as f:  # type: ignore
            f.write(json.dumps({"label": fname}, indent=2))

        with open(path / "index.mdx", "w", **wopen_kwargs) as f:  # type: ignore
            rel_path = path.relative_to(content_path)
            write_reference_index(reference_cards, fname, path, rel_path, f)

    def gen_category_recursive(nested_path: Path):
        """Generate category json recursively"""
        for folder in nested_path.iterdir():
            if folder.is_dir():
                gen_category_json(folder.name, folder)
                gen_category_recursive(folder)  # pylint: disable=cell-var-from-loop

    # Generate modules/sub category json and index files
    gen_category_recursive(content_path)

    console.print(
        "[green]Markdown files generated, check the website/content/terminal/reference/ folder[/green]"
    )

    return True


if __name__ == "__main__":
    main()