#!/bin/bash

export LC_ALL=C

############################### JS Lint #####################################

LINTED_DIRECTORIES="apps shared build/test/unit tv_apps"
JSHINT_EXECUTABLE="node_modules/.bin/jshint"
JSHINT_ARGS="--reporter=build/jshint/reporter $JSHINT_ARGS"
ESLINT_EXECUTABLE="node_modules/.bin/eslint"
ESLINT_XFAIL_LIST="build/eslint/xfail.list"
ESLINT_ARGS="--ignore-path ${ESLINT_XFAIL_LIST}.tmp -f compact -c .eslintrc"
excluded_list=".jshintignore"
L10N_XFAIL_LIST="build/l10n/xfail.list"

jshint_information() {
  echo "Please read https://github.com/mozilla-b2g/gaia/tree/master/build/jshint/README.md for more information.\n"
}

mozL10n_information() {
  echo "Please read https://github.com/mozilla-b2g/gaia/tree/master/build/l10n/README.md for more information.\n"
}
eslint_information() {
  echo "Please read https://github.com/mozilla-b2g/gaia/tree/master/build/eslint/README.md for more information.\n"
}


if [ ! -r $excluded_list ];
then
  exit 0
fi

hash node > /dev/null 2>&1
if [ $? -eq 1 ];
then
  echo >&2 "You should install node to lint your patch"
  echo >&2 "http://nodejs.org/download/"
  exit 0
fi

if [ ! -x "$JSHINT_EXECUTABLE" ];
then
  echo >&2 'You should run `npm install` to lint your patch'
  exit 0
fi

# Skips if this repo is on an older commit where eslint is not yet available
if [ ! -x "$ESLINT_EXECUTABLE" -a -r ".eslintrc" ];
then
  echo >&2 'You should run `npm install` to lint your patch'
  exit 0
fi

js_changed_files=`git diff --staged --name-only --diff-filter=ACMRT -- $LINTED_DIRECTORIES | grep '\.js$'`
if [ -n "$js_changed_files" ]
then

  echo "jshint check:"

  # using the real jshint instead of the make target to prevent running npm
  # install at commit time
  $JSHINT_EXECUTABLE $JSHINT_ARGS $js_changed_files
  jshint_result=$?

  eslint_result=0
  # Skip if this repo is on an older commit where eslint is not yet available
  if [ -r ".eslintrc" ];
  then
    echo "eslint check:"

    # filter comments from xfail.list:
    sed 's/\s*#.*$//' "$ESLINT_XFAIL_LIST" | sort -u > "$ESLINT_XFAIL_LIST".tmp

    # check if a changed file is in the eslint xfail list
    xfailed_eslint=`echo "$js_changed_files" | sort | comm -12 "$ESLINT_XFAIL_LIST".tmp - | tr '[:space:]' ' '`

    if [ -n "$xfailed_eslint" ] ; then
      # warn about files being xfailed
      for file in $js_changed_files ; do
        one_was_ignored=""
        if grep -q $file "$ESLINT_XFAIL_LIST" ; then
          one_was_ignored="1"
          echo "$file: eslint errors are ignored. Please consider fixing these errors and removing the filename from $ESLINT_XFAIL_LIST."
        fi
      done
      test -n "$one_was_ignored" && eslint_information
    fi

    $ESLINT_EXECUTABLE $ESLINT_ARGS $js_changed_files
    eslint_result=$?
    rm "$ESLINT_XFAIL_LIST".tmp
  fi

  if [ $jshint_result -ne 0 -o $eslint_result -ne 0 ] ; then
    echo "There were errors while linting the files, please see above."
    test $jshint_result -ne 0 && jshint_information
    test $eslint_result -ne 0 && eslint_information
    exit 1
  fi

  # XXX migrate this to an eslint plugin: https://bugzil.la/1159667
  if [ -r "$L10N_XFAIL_LIST" ]; then
    echo
    echo "mozL10n check:"
    # warn about files being xfailed
    for file in $js_changed_files ; do
      one_was_ignored=""
      if grep -q $file "$L10N_XFAIL_LIST" ; then
        one_was_ignored="1"
        echo "$file: mozL10n errors are ignored. Please consider fixing errors and removing it from $L10N_XFAIL_LIST."
      fi
    done

    test -n "$one_was_ignored" && mozL10n_information

    to_lint=`echo "$js_changed_files" | sort | comm -13 "$L10N_XFAIL_LIST" - | tr '[:space:]' ' '`
    # check for deprecated mozL10n API uses
    for file in $to_lint ; do
      one_failed=""
      if grep -q "mozL10n.get\b" "$file" ; then
        one_failed="1"
        echo "$file uses mozL10n.get which is deprecated."
      fi
    done

    test -n "$one_failed" && mozL10n_information && exit 1
  fi


fi


############################### CSS Lint #####################################

css_changed_files=`git diff --staged --name-only --diff-filter=ACMRT -- apps shared/ | grep '\.css$' | tr '\n' ' '`
if [ -n "$css_changed_files" ]
then
  XULRUNNER_SDK=$(make xulrunner_sdk)
  XPCSHELL_SDK=$(make xpcshell_sdk)

  # $XULRUNNER_SDK is an environment variable assignment on some platforms, for
  # example: LD_LIBRARY_PATH=/xxx/xxx/xxx
  # so we need to use "env" to properly execute this command expanding this
  # variable assignment as intended.
  env GAIA_DIR=$(pwd) $XULRUNNER_SDK $XPCSHELL_SDK \
    -f build/xpcshell-commonjs.js \
    -e "quit(require('csslint').lint('$(pwd)', '$css_changed_files'));"

  if [ $? -ne 0 ]
  then
    echo "There were errors while linting the files, please see above."
    exit 1
  fi
fi

echo "No errors - committing"

############################# locale check #####################################
locales_changed_files=`git diff --staged --name-only --diff-filter=ACMRT | grep '\.properties$'`
if [ -n "$locales_changed_files" ]
then
  updatedL10nIds=()
  needToHintDevelopers=0

  for file in $locales_changed_files ; do
    grepRuleForBoth="^[+-].*=.*"
    grepRuleForAddition="^[+](.*)="
    grepRuleForDeletion="^[-](.*)="

    addition_locale_ids=()
    deletion_locale_ids=()
    count=0

    while read -r eachLine
    do
      if [[ "$eachLine" =~ $grepRuleForAddition ]]
      then
        addition_locale_ids+=(${BASH_REMATCH[1]})
      fi

      if [[ "$eachLine" =~ $grepRuleForDeletion ]]
      then
        deletion_locale_ids+=(${BASH_REMATCH[1]})
      fi
    # check http://mywiki.wooledge.org/BashFAQ/024
    done < <(git diff HEAD~ --staged $file | grep $grepRuleForBoth)

    # final compare
    for eachAdditionId in "${addition_locale_ids[@]}"
    do
      for eachDeletionId in "${deletion_locale_ids[@]}"
      do
        if [[ "$eachAdditionId" =~ "$eachDeletionId" ]]
        then
          needToHintDevelopers=1
          updatedL10nIds+=($eachAdditionId)
        fi
      done
    done
  done

  if [ $needToHintDevelopers -ne 0 ]
  then
    echo "[NOTE] You are updating the same translation under these locale ids :"
    for eachL10nId in "${updatedL10nIds[@]}"
    do
      echo "Updated id : $eachL10nId"
    done
    echo "Please double check whether you should introduce a new locale id or not."
  fi
fi