#!/usr/bin/env python
import os
import pathlib
import shutil
import sys

import yaml
from bs4 import BeautifulSoup


def get_nav_from_selector(soup: BeautifulSoup, selector: str, docs_dir: str):
    """
    Generates navigation from template file
    """
    navigation = []
    header_name = ""
    for anchor in soup.select(selector):
        classes = anchor.get("class", [])
        if classes is None:
            continue

        if "disabled" in classes:
            header_name = anchor.text
            navigation.append({header_name: []})

        href = anchor.get("href", "")
        if href is None:
            continue

        href = str(href)
        if href == "#":
            continue

        url = href.replace("{{NAME}}", "")
        filename = url.replace("http://progrium.viewdocs.io/dokku/", "")
        filename = filename.replace("http://dokku.viewdocs.io/dokku/", "")
        filename = filename.strip("/") + ".md"
        filename = filename.removeprefix("dokku/")

        ignore_errors_for = [
            "getting-started/installation.md",
            "getting-started/upgrading.md",
        ]
        if not os.path.exists(docs_dir + "/" + filename):
            if filename not in ignore_errors_for:
                print("error fetching markdown file:", filename)
                continue

        for nav in navigation:
            if header_name in nav:
                if filename == "getting-started/installation.md":
                    child_dir = "getting-started/install/"
                    children = os.listdir(docs_dir + "/" + child_dir)
                    children = [child_dir + c for c in children]
                    children.sort()
                    children.insert(0, "getting-started/advanced-installation.md")
                    if os.path.exists(docs_dir + "/" + filename):
                        children.insert(0, filename)
                    else:
                        children.insert(0, "getting-started/installation/index.md")
                    nav[header_name].append(
                        {
                            "Getting Started with Dokku": children,
                        }
                    )
                    continue

                if filename == "getting-started/upgrading.md":
                    child_dir = "appendices/"
                    children = os.listdir(docs_dir + "/" + child_dir)

                    children.sort(
                        key=lambda x: list(map(int, x.split("-")[0].split("."))) if "." in x else [-1, -1, -1],
                        reverse=True,
                    )
                    children = [child_dir + c for c in children]
                    if os.path.exists(docs_dir + "/" + filename):
                        children.insert(0, filename)
                    else:
                        children.insert(0, "getting-started/upgrading/index.md")
                    nav[header_name].append(
                        {
                            "Upgrading": children,
                        }
                    )
                    continue

                nav[header_name].append(filename)
    return navigation


def generate_nav(src: str, dest: str) -> None:
    """
    Writes out navigation information to the mkdocs yaml file
    """
    navigation = []
    repo_dir = pathlib.Path(__file__).parent.parent.resolve()
    docs_dir = str(repo_dir) + "/docs"
    with open(docs_dir + "/template.html", encoding="utf-8") as response:
        soup = BeautifulSoup(response, "html.parser")
        selectors = [
            ".container .row .list-group a",
            ".container-fluid .row .list-group a",
        ]
        for selector in selectors:
            navigation = get_nav_from_selector(soup, selector, docs_dir)
            if len(navigation) > 0:
                break

        if len(navigation) == 0:
            print("No navigation found")
            sys.exit(1)

    with open(src, encoding="utf-8") as handler:
        data = yaml.unsafe_load(handler)
        data["nav"] = [
            {"Docs": navigation},
            {"Pro": "https://pro.dokku.com/docs/getting-started/"},
            {"Blog": "https://dokku.com/blog/"},
            {"Tutorials": "https://dokku.com/tutorials/"},
            {
                "Purchase Dokku Pro": "https://dokku.dpdcart.com/cart/add?product_id=217344&method_id=236878"
            },
        ]

    with open(dest, mode="wt", encoding="utf-8") as handler:
        yaml.dump(data, handler)


def main():
    """
    Main command that performs doc manipulation
    """
    print("----> Copying mkdocs.yml")
    print("      Generating navigation")
    generate_nav("/usr/src/source/mkdocs.yml", "/usr/src/app/mkdocs.yml")

    if os.path.exists("/usr/src/app/docs"):
        print("      Removing old docs folder")
        shutil.rmtree("/usr/src/app/docs")

    print("      Performing copy")
    shutil.copytree("/usr/src/source/docs", "/usr/src/app/docs")


if __name__ == "__main__":
    main()