#!/bin/sh

runKtlint () {
    # Following code was generated automatically by running ./gradlew addKtlintFormatGitPreCommitHook
    # for reference, see https://github.com/JLLeitschuh/ktlint-gradle#additional-helper-tasks
    # and for the implementation, https://github.com/JLLeitschuh/ktlint-gradle/blob/master/plugin/src/main/kotlin/org/jlleitschuh/gradle/ktlint/GitHook.kt
    # The only change made are:
    # * replacing "exit" for "return", as this is running inside a function
    # * echoing if the apply fails
    # * renaming `diff` variable to `diff_path`.
    # * changing the path of the diff file (to ensure in case of failure that we don't overwrite the file)
    ######## KTLINT-GRADLE HOOK START ########

    CHANGED_FILES="$(git --no-pager diff --name-status --no-color --cached | awk '$1 != "D" && $NF ~ /\.kts?$/ { print $NF }')"

    if [ -z "$CHANGED_FILES" ]; then
        echo "No Kotlin staged files."
        return 0
    fi;

    echo "Running ktlint over these files:"
    echo "$CHANGED_FILES"

    date=$(date +%y%m%d_%H%M%S)
    diff_path=.git/unstaged-ktlint-git-hook-$date.diff
    git diff --color=never > $diff_path
    if [ -s $diff_path ]; then
      git apply -R $diff_path
    fi

    ./gradlew --quiet ktlintFormat -PinternalKtlintGitFilter="$CHANGED_FILES"
    gradle_command_exit_code=$?

    echo "Completed ktlint run."

    echo "$CHANGED_FILES" | while read -r file; do
        if [ -f $file ]; then
            git add $file
        fi
    done


    if [ -s $diff_path ]; then
        git apply --ignore-whitespace $diff_path
        apply_exit_code=$?
        if [ $apply_exit_code -ne 0 ]; then
            echo "`git apply` failed. You can find a patch of the version of the code before your `git commit` in $diff_path"
        else
            rm $diff_path
        fi
    else
      rm $diff_path
    fi
    unset diff_path

    echo "Completed ktlint hook."
    return $gradle_command_exit_code
    ######## KTLINT-GRADLE HOOK END ########
}

runPrettier () {
    # check if npx is installed, else skip runPrettier
    if ! command -v npx &> /dev/null
    then
        echo "npx could not be found. Hence, skipping pre-commit Prettier run."
        return 0
    fi

    CHANGED_JS_FILES="$(git --no-pager diff --name-status --no-color --cached | awk '$1 != "D" && $2 ~ /\.js/ { print $2 }')"
        if [ -z "$CHANGED_JS_FILES" ]; then
            echo "No Javascript staged files. Hence, skipping pre-commit Prettier run."
            return 0
        fi;

    # Prettify changed files
    echo "$CHANGED_JS_FILES" | xargs npx prettier --ignore-unknown --write

    echo "Completed npx prettier run."
    echo "$CHANGED_JS_FILES" | while read -r file; do
        if [ -f "$file" ]; then
            git add "$file"
        fi
    done
}

runKtlint
ktlint_exit_code=$?
if [ $ktlint_exit_code -ne 0 ]; then
    echo "ktlint failed"
    exit $ktlint_exit_code
fi
runPrettier || :; # || to avoid cancelling the commit if there is an error with Prettier
prettier_exit_code=$?
if [ $prettier_exit_code -ne 0 ]; then
    exit $prettier_exit_code
fi;
echo "Completed the pre-commit hook."