from __future__ import annotations
import logging
import shutil
from pathlib import Path
import os
import markdown
from typing import Optional, Union, Dict, Generator

from .config import SOURCE_DIRECTORY, DIST_DIRECTORY, LANGUAGE_INFORMATION


logger = logging.getLogger("stsg.build")


class CustomPath:
    def __init__(self, path: Path):
        self.path = path

    def __repr__(self) -> str:
        return str(self.path)

    @property
    def source_path(self) -> Path:
        return Path(SOURCE_DIRECTORY, self.path)

    @property
    def dist_path(self) -> Path:
        return Path(DIST_DIRECTORY, self.path)

    @property
    def name(self) -> str:
        return Path(self.path).name   

    @property
    def parent(self) -> CustomPath:
        return CustomPath(Path(self.path).parent)  
        
    @property
    def stem(self) -> str:
        return Path(self.path).stem 

    def iterdir(self) -> Generator[CustomPath, None, None]:
        for p in self.source_path.iterdir():
            yield CustomPath(Path(self.path, p.name))

    def get_child(self, name: str, force_directory: bool = False, force_file: bool = False) -> Optional[CustomPath]:
        child = Path(self.source_path, name)

        if not child.exists():
            return None

        if force_directory and not child.is_dir():
            return None

        if force_file and not child.is_file():
            return None

        return CustomPath(Path(self.path, name))

    def read_text(self) -> str:
        return self.source_path.read_text()

def copy_static(path: CustomPath):
    src = path.source_path
    dst = path.dist_path

    if not src.exists():
        logger.warning("The static folder '%s' wasn't defined.", src)
        return

    logger.info("Copying static files from '%s' to '%s'", src, dst)

    dst.mkdir(parents=True, exist_ok=True)

    for root, dirs, files in os.walk(src):
        root_path = Path(root)

        if any(part.startswith(".") for part in root_path.parts):
            continue

        rel_path = root_path.relative_to(src)
        dest_dir = dst / rel_path
        dest_dir.mkdir(parents=True, exist_ok=True)

        for file in files:
            if file.startswith("."):
                continue

            src_file = root_path / file
            dest_file = dest_dir / file
            shutil.copy2(src_file, dest_file)
            


class Article(CustomPath):
    def __init__(self, path: CustomPath):
        super().__init__(path.path)

    def get_content(self) -> str:
        if self.name.endswith(".md"):
            return markdown.markdown(self.read_text())

        return self.read_text()

    @property
    def article_directory(self) -> Path:
        return self.dist_path.parent / self.stem


class CustomLanguageCode:
    def __init__(self, file: CustomPath):
        self.file = file

    @property
    def language_code(self) -> str:
        return self.file.stem

    @property
    def relative_url(self) -> str:
        return "/" + str(self)

    def __repr__(self) -> str:
        return f"{self.language_code}"

    def _get_additional_data(self) -> dict:
        parsed_language_code = self.language_code.lower().replace("-", "_")
        if parsed_language_code in LANGUAGE_INFORMATION:
            return LANGUAGE_INFORMATION[parsed_language_code]
        
        parsed_language_code = parsed_language_code.split("_")[0]
        if parsed_language_code in LANGUAGE_INFORMATION:
            return LANGUAGE_INFORMATION[parsed_language_code]

        return {}
    
    @property
    def flag(self) -> str:
        return self._get_additional_data()["flag"]
    
    @property
    def native_name(self) -> str:
        return self._get_additional_data()["native_name"]

    @property
    def html_code(self) -> str:
        return f'<ul><a href="{self.relative_url}"><bold>{self.flag} {self.native_name}</bold></a></ul>'


class Template:
    def __init__(self, root: CustomPath):
        self.root = root

        self.articles = []

    def copy(self):
        return Template(root=self.root)

    def _replace_keywords(self, text: str, **placeholder_values: str) -> str:
        for key, value in placeholder_values.items():
            text = text.replace(f"<{key}/>", value)
            text = text.replace(f"<{key} />", value)

        return text

    @property
    def article_template(self) -> str:
        article = self.root.get_child("article.html", force_file=True)
        return article.source_path.read_text() if article else "<content/>"

    def convert_article(self, path: Article):
        logger.info("converting %s", path)

        article_text = self._replace_keywords(
            self.article_template,
            content = path.get_content(),
        )

        path.article_directory.mkdir(parents=True, exist_ok=True)
        with Path(path.article_directory, "index.html").open("w") as f:
            f.write(article_text)


def walk_directory(root: CustomPath, template: Optional[Template] = None):
    template_dir = root.get_child("_templates", force_directory=True)
    if template_dir is not None:
        template = Template(template_dir)

    if template is None:
        logger.error("Didn't find template for %d", root)
        return

    for current_path in root.iterdir():
        if current_path.name.startswith("_") or current_path.name == "static":
            continue

        if current_path.source_path.is_file():
            template.convert_article(Article(current_path))
            continue

        if current_path.source_path.is_dir():
            walk_directory(current_path, template=template.copy())



    static_dir = root.get_child("static", force_directory=True)
    if static_dir:
        copy_static(static_dir)


def build():
    logger.info("building static page")
    walk_directory(CustomPath(Path()))