#!/usr/bin/env bash

# Set up environment
source ~/bin/philomena-env

read oldrev newrev ref
echo "Updating $oldrev -> $newrev ($ref)"

# Clear variable set to '.' so git commands don't complain
unset GIT_DIR

cd ~/philomena

die() {
    echo "$*" 1>&2
    exit 1
}

if git diff --name-only $oldrev $newrev | grep -Ee "^mix.(exs|lock)"; then
  echo "Fetching deps"
  mix deps.get || die "mix failed to update"
fi

# Compile assets
if git diff --name-only $oldrev $newrev | grep "^assets/"; then
  echo "Compiling assets"
  npm install --prefix ./assets || die "assets install failed"
  npm run deploy --prefix ./assets
  mix phx.digest || die "assets compile failed"
fi

echo "Building release"
mix release --overwrite || die "failed to generate release"

# Run migrations
if git diff --name-only $oldrev $newrev | grep "^priv/repo/migrations"; then
  echo "Running database migrations"
  _build/prod/rel/philomena/bin/philomena eval "Philomena.Release.migrate()" || die "ecto.migrate failed"
fi

# Include a task to restart your running appserver instances here.
#
# In general, you should have many app instances configured on different
# ports using the PORT environment variable, so as to allow you to roll
# releases and deploy new code with no visible downtime.
#
# You can use a reverse proxy like haproxy or nginx to load balance between
# different server instances automatically.