#!/usr/bin/env bash

set -euo pipefail

REPO_FOLDER="drive-temp"

function clone_repo() {
  mkdir -p "$REPO_FOLDER"
  cd "$REPO_FOLDER"

  inside_git_repo="$(git rev-parse --is-inside-work-tree 2>/dev/null || true)"
  if [ ! "$inside_git_repo" ]; then
    git init
    git remote add origin "https://$GITLAB_ACCESS_TOKEN_NAME:$GITLAB_ACCESS_TOKEN@git.zeus.gent/bestuur/drive.git"
    git config user.email "codimd.zeus.gent@mcbloch.dev"
    git config user.name "CodiMD sync bot"
    git pull origin master
  else
    echo "> Git repo already initialized, skipping"
  fi
  git fetch -a

  cd ..
}

function clear_repo() {
  git restore .
  git checkout -- .
}

function checkout_branch() {
  branch_name=$1

  # Start from master
  git checkout master

  # Now go to the correct branch name
  if ! git checkout -b "$branch_name" >/dev/null; then
    echo "> Checkout existing branch"
    git checkout "$branch_name" >/dev/null
  else
    echo "> Created new branch"
  fi

  if git branch --set-upstream-to="origin/$branch_name" "$branch_name"; then # >/dev/null
    git pull
  fi
}

function sync_file() {
  note_name=$1
  branch_name="codimd-sync_$sync_to"

  echo "> Starting sync of $note_name"

  clear_repo
  checkout_branch "$branch_name"

  echo "> Copy the note to $sync_to"
  cp "../data/$note_name" "$sync_to"

  git add "$sync_to"
  if ! git commit -m "[bot] Update Gitlab with latest CodiMD file version"; then
    #echo "> No changes in our file."
    :
  else
    #echo "> Changes in our file, committing."
    :
  fi

  git push -u origin "$branch_name"

  #MR_NAME="[CodiMD Sync] $note_name"
  #echo "> Checking if pr with name '$MR_NAME' already exists"

  # mrs=$(curl --header "PRIVATE-TOKEN: $GITLAB_ACCESS_TOKEN" "https://git.zeus.gent/api/v4/projects/$GITLAB_PROJECT_ID/merge_requests?labels=codimd-sync" | jq -e 'select(type == "array" and length == 0)' )

  # echo $mrs | jq -e 'select(type == "array" and length == 0)'

  # Check if a MR is already made (open or merged)
  echo "> Checking if the branch differs from master"
  echo "> If so a new pr should be created to push our work"
  echo "> If an open pr already exists, pass"
  echo

  diff_lines=$(git diff "origin/master..$branch_name" | wc -l)
  if [ "$diff_lines" == "0" ]; then
    echo "> Branch has no changes compared to master."
  else
    echo "> Branch has changes"

    if (glab mr list --all --source-branch="$branch_name" | grep "No merge requests match your search"); then
      echo "> No matching Merge Request found at all"

      glab mr create --label codimd-sync -t "[CodiMD sync] Add document $sync_to" --fill --yes

      cd ..
      rm -rf drive-temp
    else
      echo "> Matching Merge Request found"
      echo "> Making sure it is an open one"

      if (glab mr list --source-branch="$branch_name" | grep "No open merge requests match your search"); then
        echo "No open merge request found"
        glab mr create --label codimd-sync -t "[CodiMD sync] Update document $sync_to" --fill --yes
      else
        echo "Open merge request found."
      fi
    fi

  fi
}

function sync_files() {
  cd data
  for note_name in *.md; do
    echo
    echo "> ======================"
    echo "> Analyzing $note_name"

    # Extract the sync-to path
    sync_to=$(sed -n -e '/:::spoiler Gitlab sync/,/:::/ p' "$note_name" | grep "sync-to" | cut -d":" -f2 | xargs || true)

    if [ "$sync_to" == "" ]; then
      # echo "> No metadata found, skip"
      :
    else
      echo "> Found a requested sync to: $sync_to"
      cd ../$REPO_FOLDER
      sync_file "$note_name"
      cd ../data
    fi

  done
}

glab auth login --hostname git.zeus.gent --token "$GITLAB_TOKEN"

# A one time operation to clone the repo.
clone_repo

# Loop over the files in the data folder and sync them to Gitlab via Merge Requests
sync_files

exit 0

# https://git.zeus.gent/bestuur/drive
# GITLAB_PROJECT_ID=2