import os
from html5tagger import Document, E, HTML
from shutil import rmtree
import markdown
import html
from pathlib import Path

def generateNavigationBar(lines):
  global navbar
  navbar = E
  rawhtml = False
  htmlstring = ""
  for id, line in enumerate(lines):

    #parse raw HTML
    rawhtml, navbar, htmlstring = parseRawHTML(navbar, line, htmlstring, rawhtml, id, len(lines))

    #parse markdown
    if not rawhtml:
      navbar = navbar.li(HTML(parseMarkdown(navbar, line)))

def parseRawHTML(doc, line, htmlstring, rawhtml, id, maxlines):
  #raw html start
  if line.strip() == ">":
    rawhtml = True
    htmlstring = ""

  #parse indented raw html
  elif rawhtml:
    if line.startswith("  "):

      #experimental markdown inside HTML support
      htmlstring = htmlstring + html.unescape(markdown.markdown(html.escape(line.strip())))

      #if indented html was the last line, this is needed for it to not be ignored
      #since this is the end of the file, we will not set rawhtml to False.
      if maxlines - id == 1:
        doc.div(HTML(htmlstring))
    else:
      rawhtml = False
      doc.div(HTML(htmlstring))
      htmlstring = ""
  return rawhtml, doc, htmlstring

def parseMarkdown(doc, line):
  #do not allow HTML in markdown
  line = html.escape(line.strip())
  return markdown.markdown(line)

def generateLines(title, lines):
  title = title.replace(".page", "")
  doc = Document(title, lang="en")
  rawhtml = False
  htmlstring = ""
  for id, line in enumerate(lines):

    #parse raw HTML
    rawhtml, doc, htmlstring = parseRawHTML(doc, line, htmlstring, rawhtml, id, len(lines))

    #parse markdown
    if not rawhtml:
      doc = doc(HTML(parseMarkdown(doc, line)))

  generatePage(title, doc)

def generatePage(title, doc):
  global pages
  global titles
  global pagescount
  if 'pages' not in globals():
    pages = []
  if 'titles' not in globals():
    titles = []
  if 'navbar' in globals():
    pages.append(str(E.ul(navbar)) + str(doc))
    titles.append(title)
  else:
    pages.append(str(doc))
    titles.append(title)

def writePages(homepage):
  global pages
  global titles

  try:
    os.mkdir("./website-output")
  except FileExistsError:
    pass
    print("Output directory already exists, let's clean it!")
    #TODO only delete files that aren't present in newest site generation
    #deleting contents of folder without deleting the folder, to increase compatibility with various systems
    #for root, dirs, files in os.walk('./website-output'):
    #  for f in files:
    #    os.unlink(os.path.join(root, f))
    #  for d in dirs:
    #    rmtree(os.path.join(root, d))

  for id, page in enumerate(pages):
    foldername = ""
    #creates ./website-output/pagetitle/index.html file if it is not homepage
    if titles[id] != homepage:
      foldername = "/" + titles[id].replace(" ", "-").lower()

      #doing this here, because homepage directory is already created above
      try:
        os.mkdir("./website-output" + foldername)
      except FileExistsError:
        pass

    changed = False
    filepath = Path("./website-output" + foldername + "/index.html")

    if filepath.exists():
      with open("./website-output" + foldername + "/index.html", 'r') as newpage:
        if newpage.read() != page:
          changed = True
    else:
      changed = True

    if changed:
      with open("./website-output" + foldername + "/index.html", 'w') as newpage:
        newpage.write(page)
        print("Written changed page: " + titles[id])
    else:
      print("Page not changed: " + titles[id])

def main():
  #if homepage is at Home.page, set homepage to "Home"
  homepage = "Home"

  if os.path.exists("./navbar"):
    with open("./navbar", 'r') as navbarfile:
      generateNavigationBar(navbarfile.readlines())
  else:
    print("No 'navbar' file found, there will be no navigation bar.")

  #count total amount of pages first
  pagescount = 0
  for file in os.listdir("./"):
    if file.endswith(".page"):
      pagescount += 1
      with open(file, 'r') as page:
        generateLines(os.path.basename(file), page.readlines())
  print("Found " + str(pagescount) + " pages")

  writePages(homepage)

if __name__ == "__main__":
  main()