#!/usr/bin/env bash

# Exit immediately when a command fails.
set -e
# Make sure exit code are respected in a pipeline.
set -o pipefail
# Treat unset variables as an error and exit immediately.
set -u

INITIAL_GIT_BRANCH=$(git rev-parse --abbrev-ref HEAD)
GIT_CHANGES=$(git status --porcelain)
DIFF_WITH_ONE_LINE_CHANGE="1 file changed, 1 insertion(+), 1 deletion(-)"
GIT_REPO_NAME=addons-linter
GIT_REMOTE="${GIT_REMOTE:-git@github.com:mozilla/$GIT_REPO_NAME.git}"
LOG_FILE="l10n-extraction.log"

info() {
  local message="$1"

  echo ""
  echo "INFO: $message"
  echo ""
}

error() {
  local message="$1"

  echo "ERROR: $message"
  exit 1
}

run_l10n_extraction() {
  local branch="$GIT_REPO_NAME-locales-$(date -u --iso-8601=date)"

  info "Starting l10n extraction"

  # Detect local (uncommitted) changes.
  if [[ ! -z "$GIT_CHANGES" ]]; then
    error "You have local changes, therefore this script cannot continue."
  fi

  # Switch to the `master` branch if we are not on it already.
  if [[ "$INITIAL_GIT_BRANCH" != "master" ]]; then
    git checkout master
  fi

  # Make sure the 'master' branch is up-to-date.
  git pull "$GIT_REMOTE" master

  # Update dependencies
  npm i >> "$LOG_FILE" 2>&1

  # Ensure the branch to extract the locales is clean.
  if [[ $(git branch --list "$branch") ]]; then
    info "Deleting branch '$branch' because it already exists"
    git branch -D "$branch"
  fi

  info "Creating and switching to branch '$branch'"
  git checkout -b "$branch"

  info "Extracting locales (this can take several minutes)"
  npm run extract-locales >> "$LOG_FILE" 2>&1

  local git_diff_stat
  git_diff_stat=$(git diff --shortstat)

  if [[ -z "$git_diff_stat" ]] || [[ "$git_diff_stat" == *"$DIFF_WITH_ONE_LINE_CHANGE"* ]]; then
    info "No locale changes, nothing to update, ending process"
    git checkout -- .
    git checkout "$INITIAL_GIT_BRANCH"
    git branch -d "$branch"
    return
  fi

  info "Merging locales"
  ./scripts/merge-locales >> "$LOG_FILE" 2>&1

  git commit -a -m "Extract and merge locales ($(date -u --iso-8601=date))" --no-verify

  git push "$GIT_REMOTE" "$branch"

  git checkout "$INITIAL_GIT_BRANCH"
  git branch -D "$branch"

  echo ""
  echo "----------------------------------------------------------------------"
  echo ""
  echo "     You can now open the link below to submit your Pull Request:"
  echo "     https://github.com/mozilla/$GIT_REPO_NAME/pull/new/$branch"
  echo ""
  echo "----------------------------------------------------------------------"
}

# Clear log file
echo "" > "$LOG_FILE"

run_l10n_extraction