import os
import shutil
from http.server import HTTPServer, SimpleHTTPRequestHandler
from pathlib import Path
from typing import Dict, Optional, Tuple

import mkdocs.commands.build
import mkdocs.commands.serve
import mkdocs.config
import mkdocs.utils
import typer
import yaml

app = typer.Typer()

mkdocs_name = "mkdocs.yml"

missing_translation_snippet = """
{!../../../docs/missing-translation.md!}
"""

docs_path = Path("docs")
en_docs_path = Path("docs/en")
en_config_path: Path = en_docs_path / mkdocs_name


def get_en_config() -> dict:
 return mkdocs.utils.yaml_load(en_config_path.read_text(encoding="utf-8"))


def get_lang_paths():
 return sorted(docs_path.iterdir())


def lang_callback(lang: Optional[str]):
 if lang is None:
 return
 if not lang.isalpha() or len(lang) != 2:
 typer.echo("Use a 2 letter language code, like: es")
 raise typer.Abort()
 lang = lang.lower()
 return lang


def complete_existing_lang(incomplete: str):
 lang_path: Path
 for lang_path in get_lang_paths():
 if lang_path.is_dir() and lang_path.name.startswith(incomplete):
 yield lang_path.name


def get_base_lang_config(lang: str):
 en_config = get_en_config()
 fastapi_url_base = "https://fastapi.tiangolo.com/"
 new_config = en_config.copy()
 new_config["site_url"] = en_config["site_url"] + f"{lang}/"
 new_config["theme"]["logo"] = fastapi_url_base + en_config["theme"]["logo"]
 new_config["theme"]["favicon"] = fastapi_url_base + en_config["theme"]["favicon"]
 new_config["theme"]["language"] = lang
 new_config["nav"] = en_config["nav"][:2]
 extra_css = []
 css: str
 for css in en_config["extra_css"]:
 if css.startswith("http"):
 extra_css.append(css)
 else:
 extra_css.append(fastapi_url_base + css)
 new_config["extra_css"] = extra_css

 extra_js = []
 js: str
 for js in en_config["extra_javascript"]:
 if js.startswith("http"):
 extra_js.append(js)
 else:
 extra_js.append(fastapi_url_base + js)
 new_config["extra_javascript"] = extra_js
 return new_config


@app.command()
def new_lang(lang: str = typer.Argument(..., callback=lang_callback)):
 """
 Generate a new docs translation directory for the language LANG.

 LANG should be a 2-letter language code, like: en, es, de, pt, etc.
 """
 new_path: Path = Path("docs") / lang
 if new_path.exists():
 typer.echo(f"The language was already created: {lang}")
 raise typer.Abort()
 new_path.mkdir()
 new_config = get_base_lang_config(lang)
 new_config_path: Path = Path(new_path) / mkdocs_name
 new_config_path.write_text(
 yaml.dump(new_config, sort_keys=False, width=200, allow_unicode=True),
 encoding="utf-8",
 )
 new_config_docs_path: Path = new_path / "docs"
 new_config_docs_path.mkdir()
 en_index_path: Path = en_docs_path / "docs" / "index.md"
 new_index_path: Path = new_config_docs_path / "index.md"
 en_index_content = en_index_path.read_text(encoding="utf-8")
 new_index_content = f"{missing_translation_snippet}\n\n{en_index_content}"
 new_index_path.write_text(new_index_content, encoding="utf-8")
 typer.secho(f"Successfully initialized: {new_path}", color=typer.colors.GREEN)
 update_languages(lang=None)


@app.command()
def build_lang(
 lang: str = typer.Argument(
 ..., callback=lang_callback, autocompletion=complete_existing_lang
 )
):
 """
 Build the docs for a language, filling missing pages with translation notifications.
 """
 lang_path: Path = Path("docs") / lang
 if not lang_path.is_dir():
 typer.echo(f"The language translation doesn't seem to exist yet: {lang}")
 raise typer.Abort()
 typer.echo(f"Building docs for: {lang}")
 build_dir_path = Path("docs_build")
 build_dir_path.mkdir(exist_ok=True)
 build_lang_path = build_dir_path / lang
 en_lang_path = Path("docs/en")
 site_path = Path("site").absolute()
 if lang == "en":
 dist_path = site_path
 else:
 dist_path: Path = site_path / lang
 shutil.rmtree(build_lang_path, ignore_errors=True)
 shutil.copytree(lang_path, build_lang_path)
 en_config_path: Path = en_lang_path / mkdocs_name
 en_config: dict = mkdocs.utils.yaml_load(en_config_path.read_text(encoding="utf-8"))
 nav = en_config["nav"]
 lang_config_path: Path = lang_path / mkdocs_name
 lang_config: dict = mkdocs.utils.yaml_load(
 lang_config_path.read_text(encoding="utf-8")
 )
 lang_nav = lang_config["nav"]
 # Exclude first 2 entries FastAPI and Languages, for custom handling
 use_nav = nav[2:]
 lang_use_nav = lang_nav[2:]
 file_to_nav = get_file_to_nav_map(use_nav)
 sections = get_sections(use_nav)
 lang_file_to_nav = get_file_to_nav_map(lang_use_nav)
 use_lang_file_to_nav = get_file_to_nav_map(lang_use_nav)
 for file in file_to_nav:
 file_path = Path(file)
 lang_file_path: Path = build_lang_path / "docs" / file_path
 en_file_path: Path = en_lang_path / "docs" / file_path
 lang_file_path.parent.mkdir(parents=True, exist_ok=True)
 if not lang_file_path.is_file():
 en_text = en_file_path.read_text(encoding="utf-8")
 lang_text = get_text_with_translate_missing(en_text)
 lang_file_path.write_text(lang_text, encoding="utf-8")
 file_key = file_to_nav[file]
 use_lang_file_to_nav[file] = file_key
 if file_key:
 composite_key = ()
 new_key = ()
 for key_part in file_key:
 composite_key += (key_part,)
 key_first_file = sections[composite_key]
 if key_first_file in lang_file_to_nav:
 new_key = lang_file_to_nav[key_first_file]
 else:
 new_key += (key_part,)
 use_lang_file_to_nav[file] = new_key
 key_to_section = {(): []}
 for file, file_key in use_lang_file_to_nav.items():
 section = get_key_section(key_to_section=key_to_section, key=file_key)
 section.append(file)
 new_nav = key_to_section[()]
 export_lang_nav = [lang_nav[0], nav[1]] + new_nav
 lang_config["nav"] = export_lang_nav
 build_lang_config_path: Path = build_lang_path / mkdocs_name
 build_lang_config_path.write_text(
 yaml.dump(lang_config, sort_keys=False, width=200, allow_unicode=True),
 encoding="utf-8",
 )
 current_dir = os.getcwd()
 os.chdir(build_lang_path)
 mkdocs.commands.build.build(mkdocs.config.load_config(site_dir=str(dist_path)))
 os.chdir(current_dir)
 typer.secho(f"Successfully built docs for: {lang}", color=typer.colors.GREEN)


@app.command()
def build_all():
 """
 Build mkdocs site for en, and then build each language inside, end result is located
 at directory ./site/ with each language inside.
 """
 site_path = Path("site").absolute()
 update_languages(lang=None)
 en_build_path: Path = docs_path / "en"
 current_dir = os.getcwd()
 os.chdir(en_build_path)
 typer.echo(f"Building docs for: en")
 mkdocs.commands.build.build(mkdocs.config.load_config(site_dir=str(site_path)))
 os.chdir(current_dir)
 for lang in get_lang_paths():
 if lang == en_build_path or not lang.is_dir():
 continue
 build_lang(lang.name)
 typer.echo("Copying en index.md to README.md")
 en_index = en_build_path / "docs" / "index.md"
 shutil.copyfile(en_index, "README.md")


@app.command()
def update_languages(
 lang: str = typer.Argument(
 None, callback=lang_callback, autocompletion=complete_existing_lang
 )
):
 """
 Update the mkdocs.yml file Languages section including all the available languages.

 The LANG argument is a 2-letter language code. If it's not provided, update all the
 mkdocs.yml files (for all the languages).
 """
 if lang is None:
 for lang_path in get_lang_paths():
 if lang_path.is_dir():
 typer.echo(f"Updating {lang_path.name}")
 update_config(lang_path.name)
 else:
 typer.echo(f"Updating {lang}")
 update_config(lang)


@app.command()
def serve():
 """
 A quick server to preview a built site with translations.

 For development, prefer the command live (or just mkdocs serve).

 This is here only to preview a site with translations already built.

 Make sure you run the build-all command first.
 """
 typer.echo("Warning: this is a very simple server.")
 typer.echo("For development, use the command live instead.")
 typer.echo("This is here only to preview a site with translations already built.")
 typer.echo("Make sure you run the build-all command first.")
 os.chdir("site")
 server_address = ("", 8008)
 server = HTTPServer(server_address, SimpleHTTPRequestHandler)
 typer.echo(f"Serving at: http://127.0.0.1:8008")
 server.serve_forever()


@app.command()
def live(
 lang: str = typer.Argument(
 None, callback=lang_callback, autocompletion=complete_existing_lang
 )
):
 """
 Serve with livereload a docs site for a specific language.

 This only shows the actual translated files, not the placeholders created with
 build-all.

 Takes an optional LANG argument with the name of the language to serve, by default
 en.
 """
 if lang is None:
 lang = "en"
 lang_path: Path = docs_path / lang
 os.chdir(lang_path)
 mkdocs.commands.serve.serve(dev_addr="127.0.0.1:8008")


def update_config(lang: str):
 lang_path: Path = docs_path / lang
 config_path = lang_path / mkdocs_name
 current_config: dict = mkdocs.utils.yaml_load(
 config_path.read_text(encoding="utf-8")
 )
 if lang == "en":
 config = get_en_config()
 else:
 config = get_base_lang_config(lang)
 config["nav"] = current_config["nav"]
 config["theme"]["language"] = current_config["theme"]["language"]
 languages = [{"en": "/"}]
 for lang in get_lang_paths():
 if lang.name == "en" or not lang.is_dir():
 continue
 name = lang.name
 languages.append({name: f"/{name}/"})
 config["nav"][1] = {"Languages": languages}
 config_path.write_text(
 yaml.dump(config, sort_keys=False, width=200, allow_unicode=True),
 encoding="utf-8",
 )


def get_key_section(
 *, key_to_section: Dict[Tuple[str, ...], list], key: Tuple[str, ...]
) -> list:
 if key in key_to_section:
 return key_to_section[key]
 super_key = key[:-1]
 title = key[-1]
 super_section = get_key_section(key_to_section=key_to_section, key=super_key)
 new_section = []
 super_section.append({title: new_section})
 key_to_section[key] = new_section
 return new_section


def get_text_with_translate_missing(text: str) -> str:
 lines = text.splitlines()
 lines.insert(1, missing_translation_snippet)
 new_text = "\n".join(lines)
 return new_text


def get_file_to_nav_map(nav: list) -> Dict[str, Tuple[str, ...]]:
 file_to_nav = {}
 for item in nav:
 if type(item) is str:
 file_to_nav[item] = tuple()
 elif type(item) is dict:
 item_key = list(item.keys())[0]
 sub_nav = item[item_key]
 sub_file_to_nav = get_file_to_nav_map(sub_nav)
 for k, v in sub_file_to_nav.items():
 file_to_nav[k] = (item_key,) + v
 return file_to_nav


def get_sections(nav: list) -> Dict[Tuple[str, ...], str]:
 sections = {}
 for item in nav:
 if type(item) is str:
 continue
 elif type(item) is dict:
 item_key = list(item.keys())[0]
 sub_nav = item[item_key]
 sections[(item_key,)] = sub_nav[0]
 sub_sections = get_sections(sub_nav)
 for k, v in sub_sections.items():
 new_key = (item_key,) + k
 sections[new_key] = v
 return sections


if __name__ == "__main__":
 app()