#!/bin/bash
#
# sync-media assets using git-annex
#

REMOTE="$1"
VOLUME="/media/$REMOTE"
DOMAIN="`facter domain`"
HOST="`facter hostname`"
CACHE="/var/cache/$HOST/media"
MEDIA="media.$DOMAIN"
INCOMING="$CACHE/incoming"
WHOAMI="`whoami`"
OPTIONS="$*"

# Fix identity
function sync_media_identity {
  if [ -z "`git config --local user.email`" ] || [ -z "`git config --local user.name`" ]; then
    repo="$(basename `pwd`)"
    git config user.name "${repo^} Archive"
    git config user.email "$repo@localhost"
  fi
}

# Add files into the annex
function sync_media_add {
  git annex add .

  # Adding hidden files and symlinks, find version
  #find -name '.*' -exec git annex add {} \;
  #find -type l -exec git add {} \;

  # Adding hidden files and symlinks, git+for version
  #for file in `git status --porcelain -u | sed -e 's/?? //'`; do
  #  if [ -h "$file" ]; then
  #    git add $file
  #  else
  #    git annex add $file
  #  fi
  #done

  # Adding hidden files and symlinks, git+while version
  git status --porcelain -u | sed -e 's/?? //' | while read file; do
    if [ -h "$file" ]; then
      git add "$file"
    else
      git annex add "$file"
    fi
  done
}

# Set sudo config
if [ "$WHOAMI" != 'root' ]; then
  sudo="sudo"
else
  echo "Sorry, cannot run as root"
  exit 1
fi

# Set fsck config
if echo $OPTIONS | grep -q -- "--fsck"; then
  FSCK="true"
fi

# Set unused config
if echo $OPTIONS | grep -q -- "--dropunused"; then
  DROPUNUSED="true"
fi

# Commit changes
if [ -d "$CACHE" ]; then
  # Fix cache permissions
  #echo "Fixing $CACHE permissions..."
  #$sudo find $CACHE -type f -exec chmod 644 {} \;
  #$sudo find $CACHE -type d -exec chmod 755 {} \;

  # Fix incoming permissions
  if [ -d "$INCOMING" ]; then
    echo "Fixing $INCOMING permissions..."
    $sudo find $INCOMING -type f -exec chmod 664 {} \;
    $sudo find $INCOMING -type d -exec chmod 775 {} \;
    $sudo chown -R $WHOAMI.incoming $INCOMING
  fi

  # Add and update local repositories
  for folder in `ls $CACHE`; do
    if [ -d "$CACHE/$folder/.git/annex" ]; then
      if [ "`git -C $CACHE/$folder config sync-media.skip`" == "true" ]; then
        continue
      fi

      #if [ "`git -C $CACHE/$folder config sync-media.ready`" != "true" ]; then
      #  echo "Skipping $CACHE/$folder: not sync-media ready, please config your repo."
      #  continue
      #fi

      (
      cd $CACHE/$folder
      echo "Syncing $CACHE/$folder..."

      # If there is a playlists folder, make sure mpd user can write to it
      if [ -d "playlists" ]; then
        $sudo chmod 775 playlists
        $sudo chown -R mpd.audio playlists
        $sudo chmod 664 playlists/*
      fi

      sync_media_identity
      sync_media_add
      git annex sync

      if [ "$FSCK" == "true" ]; then
        git annex fsck --fast
      fi

      if [ "$DROPUNUSED" == "true" ]; then
        git annex unused
        git annex dropunused 1-1000
      fi
      )
    fi
  done

  if [ ! -z "$REMOTE" ]; then
    # Check storage media
    MOUNT="`mount | grep $VOLUME`"
    if [ ! -z "$MOUNT" ]; then
      DRIVE="$(basename `echo $MOUNT | awk '{ print $1 }'`)"
    fi

    if [ ! -z "$DRIVE" ]; then
      if [ ! -d "$VOLUME/$MEDIA" ]; then
        echo "Folder $VOLUME/$MEDIA does not exist..."
      else
        for folder in `ls $CACHE`; do
          if [ -d "$CACHE/$folder/.git/annex" ]; then
            if [ "`git -C $CACHE/$folder config sync-media.skip`" == "true" ]; then
              continue
            fi

            #if [ "`git -C $CACHE/$folder config sync-media.ready`" != "true" ]; then
            #  echo "Skipping $CACHE/$folder: not sync-media ready, please config your repo."
            #  continue
            #fi

            if [ ! -d "$VOLUME/$MEDIA/$folder" ]; then
              (
              cd $VOLUME/$MEDIA
              echo "Initializing $VOLUME/$MEDIA/$folder..."
              git clone $CACHE/$folder && cd $folder && sync_media_identity && git annex init $DRIVE && \
                cd $CACHE/$folder && git remote add $DRIVE $VOLUME/$MEDIA/$folder
              )
            fi
          elif [ ! -d "$VOLUME/$MEDIA/$folder" ]; then
            if [ ! -e "$CACHE/$folder/.sync-media/skip" ]; then
              echo "Syncing $VOLUME/$MEDIA/$folder..."
              rsync -av --delete --exclude=.sync-media $CACHE/$folder/ $VOLUME/$MEDIA/$folder/
            fi
          fi
        done
      fi
    fi
  fi
fi

# Retrieve changes at media volumes
if [ ! -z "$DRIVE" ] && [ -d "$VOLUME/$MEDIA" ]; then
  for folder in `ls $VOLUME/$MEDIA`; do
    if [ -d "$VOLUME/$MEDIA/$folder/.git/annex" ]; then
      if [ "`git -C $VOLUME/$MEDIA/$folder config sync-media.skip`" == "true" ]; then
        continue
      fi

      (
      cd $VOLUME/$MEDIA/$folder
      echo "Syncing $VOLUME/$MEDIA/$folder..."

      # Check remote
      if ! git remote | grep -q "^$HOST$"; then
        git remote add $HOST $CACHE/$folder
      fi

      sync_media_identity
      sync_media_add
      git annex sync
      git annex get . --numcopies=3

      if [ "$FSCK" == "true" ]; then
        git annex fsck --fast
      fi

      if [ "$DROPUNUSED" == "true" ]; then
        git annex unused
        git annex dropunused 1-1000
      fi

      #git annex drop --auto --numcopies=2
      )
    elif [ -d "$CACHE/$folder" ]; then
      if [ ! -e "$CACHE/$folder/.sync-media/skip" ]; then
        echo "Syncing $VOLUME/$MEDIA/$folder..."
        rsync -av --delete --exclude=.sync-media $CACHE/$folder/ $VOLUME/$MEDIA/$folder/
      fi
    fi
  done
elif [ ! -z "$REMOTE" ]; then
  # Try to copy to a remote
  for folder in `ls $CACHE`; do
    if [ -d "$CACHE/$folder/.git/annex" ]; then
      if [ "`git -C $CACHE/$folder config sync-media.skip`" == "true" ]; then
        continue
      fi

      if git -C $CACHE/$folder remote | grep -q "^$REMOTE$"; then
        (
        cd $CACHE/$folder
        git annex copy . --to $REMOTE
        git annex sync
        )
      else
        echo "No such remote $REMOTE"
      fi
    else
      if [ ! -e "$CACHE/$folder/.sync-media/skip" ]; then
        echo "Syncing $VOLUME/$MEDIA/$folder..."
        rsync -av --delete --exclude=.sync-media $CACHE/$folder/ $REMOTE.$DOMAIN:$CACHE/$folder/
      fi
    fi
  done
fi