#!/bin/bash

if git rev-parse --verify HEAD >/dev/null 2>&1
then
        against=HEAD
else
        # Initial commit: diff against an empty tree object
        against=4b825dc642cb6eb9a060e54bf8d69288fbee4904
fi

RUST_CHECKED=false

checkBash()
{
    local file="$1"
    echo "checking for 'version' in $file"
    now=$(date +'%Y-%m-%d %R')
    sed -i "s/version: 2023-01-16 15:36
    sed -i "s/Version: 2023-01-16 15:36
    git add "$file"
}

# Set (Last Modified: <date>) in CHANGELOG.md
checkChangelog()
{
    local file="$1"
    echo "checking for 'Last Modified' in $file"
    now=$(date +'%Y-%m-%d')
    sed -i "s/\(Last Modified: .*\)/\(Last Modified: $now\)/" "$file"
    git add "$file"
}

# Use google-java-format to force code guidelines
# https://github.com/google/google-java-format
checkJavaFormat()
{
    local file="$1"
    google-java-format --dry-run -aosp --set-exit-if-changed "$file"
    retVal=$?
    if [ $retVal -ne 0 ]; then
        echo -e "\e[31mJava coding guidelines validation failed for $file \e[0m" >&2
        exit $retVal
    fi
}

checkRustFormat()
{
    if [ "$RUST_CHECKED" == "false" ]; then
        echo "checking rust code"
        command -v cargo || { echo -e "\e[31mcargo not found!\e[0m"; exit 1; }
        # diff=$(cargo fmt -- --check)
        cargo fmt -- --check
        result=$?
        if [[ $result -ne 0 ]]; then
            echo -e "\e[31mThere are some code style issues, run 'cargo fmt' first."
            exit 1
        fi
        RUST_CHECKED=true
    fi
}

for FILE in $(exec git diff --cached --name-only  --diff-filter=ACMR) ; do
        # Fix them!
        case $FILE in
                *.java)
                        echo "checking @version in $FILE"
                        now=$(date +'%d.%m.%Y %R')
                        sed -i "s/@version .*/@version $now/" "$FILE"
                        echo "checking code style in $FILE"
                        checkJavaFormat "$FILE"
                        git add "$FILE"
                        ;;
                *.rs)
                        checkRustFormat
                        ;;
                *.sh|*.profile)
                        checkBash "$FILE"
                        ;;
                CHANGELOG.md)
                        checkChangelog "$FILE"
                        ;;
                *.*|*/pre-commit)
                        echo "ignoring $FILE"
                        ;;
                *)
                        checkBash "$FILE"
                        ;;
        esac
done

exit