#!/usr/bin/env python3

from pathlib import Path
import frontmatter
import markdown
from jinja2 import Environment, FileSystemLoader
import shutil
from config import Config, logger

content_dir = Path('content')
template_dir = Path('templates')
output_dir = Path(Config.OUTPUT_DIR)
img_dir = Path('public/images')
assets_dir = Path('public/assets')
assets_css_dir = Path('public/assets/css')
assets_js_dir = Path('public/assets/js')
static_dir = Path('static')
header_image = Config.HEADER_IMAGE or '/static/header.jpg'

class ContentItemPrototype:
    def render_content(self):
        if self.image_src_file.exists():
            shutil.copyfile(self.image_src_file, output_dir / self.image)
        if self.custom_css_src_file.exists():
            shutil.copyfile(self.custom_css_src_file, output_dir / self.custom_css)
        if self.custom_js_src_file.exists():
            shutil.copyfile(self.custom_js_src_file, output_dir / self.custom_js)
        with self.content_output_path.open("w", encoding="utf-8") as f:
            f.write(content_item_template.render(content_item = self, page_title = self.title))

    def __init__(self, md_file):
        self.slug = md_file.stem
        self.data = frontmatter.load(md_file)
        self.html = markdown.markdown(self.data.content)
        self.preview = self.html[:300] + "<a href=" + f"{self.slug}.html" + ">... read more</a>"
        self.title = self.data.get("title", self.slug)
        self.omit_second_title = self.data.get("omit_second_title", False)
        self.date = self.data.get("data", "2000-01-01T00:00:00+03:00")
        self.content_output_path = output_dir / f"{self.slug}.html"
        self.image_src_file = Path(f"{content_dir}/{md_file.stem}.jpg")
        self.image = f"images/{md_file.stem}.jpg" if self.image_src_file.exists() else None
        if self.slug == 'about':
            self.image = 'static/about.jpg'
        self.custom_css_src_file = Path(f"{content_dir}/{md_file.stem}.css")
        self.custom_css = f"assets/css/{md_file.stem}.css" if self.custom_css_src_file.exists() else None
        self.custom_js_src_file = Path(f"{content_dir}/{md_file.stem}.js")
        self.custom_js = f"assets/js/{md_file.stem}.js" if self.custom_js_src_file.exists() else None
             
# Recreate the output dir if needed
if output_dir.exists():
    shutil.rmtree(output_dir)
output_dir.mkdir()

# Create public subdirs
img_dir.mkdir()
assets_dir.mkdir()
assets_css_dir.mkdir()
assets_js_dir.mkdir()

# Copy static files if exist
if static_dir.exists():
    shutil.copytree(static_dir, output_dir / "static")

# Prepare template rendering engine
env = Environment(loader=FileSystemLoader(str(template_dir)))
env.globals['header_image'] = header_image
index_template = env.get_template("index.html")
content_item_template = env.get_template("content_item.html")

# Parse the content files
content_items = []
for md_file in content_dir.glob("*.md"):
    citem = ContentItemPrototype(md_file)
    citem.render_content()
    content_items.append({
        "slug": citem.slug,
        "title": citem.title,
        "date": citem.date,
        "preview": markdown.markdown(citem.preview),
        "image": citem.image,
    })

# Render the index file
with (output_dir / "index.html").open("w", encoding="utf-8") as f:
    f.write(index_template.render(page_title = Config.MAIN_PAGE_TITLE, content_items=content_items))

# Render the about file
about_content = ContentItemPrototype(Path('static/about.md'))
about_content.render_content()

# Move 'robots.txt' into output_dir
shutil.copyfile(static_dir / 'robots.txt', output_dir / 'robots.txt')

logger.info(f"Created {len(content_items)} content items.")