module Main where

import System.Directory 
import Data.Either
import Data.List
import System.Environment (getArgs)
import System.Process (readProcess)
import Heckle

main = do
  args <- getArgs
  case args of
    ["build"] -> do
      putStrLn "Building"
      ----get all md files from directory
      putStrLn "Getting directory contents"
      fileNames <- fmap (rights . map getMD) (getDirectoryContents "posts")

      --turn the list of files into a list of posts
      putStrLn "Turning directory contents into posts"
      postsToBeCreated <- (mapM filenameToPost fileNames)
      --print postsToBeCreated
      --postsToBeCreated <- (mapM fileNameToPost fileNames)
      let posts = (reverse . rights) postsToBeCreated -- need to sort here when you add in support for dates
      let brokenPosts = lefts postsToBeCreated
      if length (brokenPosts) > 1 
        then print brokenPosts
        else putStrLn "All posts are well formed"
      --print posts

      --convert posts to their html
      mapM_ writeHTML posts

      --generate a ul from the list of posts
      putStrLn "Turning posts into an HTML element"
      let generatedHtml = postsToHtml posts
      print generatedHtml

      --read the layout file
      putStrLn "Reading the layout file"
      layoutFile <- readFile "index.html.hkl"

      --put the ul into the layout file
      putStrLn "Inserting HTML element into layout file"
      let injectedOutput = layoutFile `injectPosts` generatedHtml
      case injectedOutput of
        (Left e) -> putStrLn e
        (Right s) -> do
          --put the results into the index.html file
          putStrLn "Writing resulting file into index.html"
          writeFile "index.html" s
          putStrLn "Success building!"
      
    _ -> print "That's not a valid command"