#!/usr/bin/env bash

set -e

question_answered_with_yes() {
  local prompt="$1"
  local ans
  printf '%b\n  Enter y or n and press Enter,\n  abort with any other key ... [y/N]: ' "$prompt"
  read -r ans
  case "$ans" in
    y|Y) return 0 ;;
    n|N|"") return 1 ;;
    *) echo "Aborted."; exit 1 ;;
  esac
}

if [ -n "$(git status --porcelain)" ]; then
    echo "Error: You have uncommitted local changes."
    echo "Please commit or stash them before releasing."
    echo ""
    echo "Uncommitted files:"
    git status --short
    exit 1
fi

echo "Fetching latest changes..."
git fetch origin

CURRENT_BRANCH=$(git rev-parse --abbrev-ref HEAD)
if [ "$CURRENT_BRANCH" = "main" ]; then
    echo "Pulling latest from main..."
    git pull origin main || true
else
    echo "Error: You must be on the main branch to create a release."
    echo "Current branch: $CURRENT_BRANCH"
    exit 1
fi

VERSION_FILE="VERSION"
SCRIPT_FILE="post_installation_script/Nachinstallationsarbeiten_LC_Esslingen_XFCE.sh"

if [ ! -f "$VERSION_FILE" ]; then
    echo "Error: $VERSION_FILE not found"
    exit 1
fi

CURRENT_VERSION=$(cat "$VERSION_FILE" | tr -d '\n')

if [ ! -f "$SCRIPT_FILE" ]; then
    echo "Error: $SCRIPT_FILE not found"
    exit 1
fi

CURRENT_MAJOR=${CURRENT_VERSION#v}

if ! [[ "$CURRENT_VERSION" =~ ^v[0-9]+$ ]]; then
    echo "Error: Invalid version format in $VERSION_FILE. Expected v0, v1, v2, etc."
    exit 1
fi

NEXT_VERSION=$((CURRENT_MAJOR + 1))
NEXT_VERSION_STR="v$NEXT_VERSION"

RELEASE_BRANCH="release/$NEXT_VERSION_STR"

if git ls-remote --heads origin "$RELEASE_BRANCH" 2>/dev/null | grep -q .; then
    echo "Error: Branch $RELEASE_BRANCH already exists on remote."
    exit 1
fi

if git rev-parse "$RELEASE_BRANCH" >/dev/null 2>&1; then
    echo "Branch $RELEASE_BRANCH exists locally."
    if question_answered_with_yes "Delete local branch and continue?"; then
        git branch -D "$RELEASE_BRANCH"
    else
        echo "Release aborted."
        exit 0
    fi
fi

echo "Current version: $CURRENT_VERSION"
echo "Proposed version: $NEXT_VERSION_STR"
echo "Release branch: $RELEASE_BRANCH"
echo ""

if ! question_answered_with_yes "Confirm release version $NEXT_VERSION_STR?"; then
    echo "Release aborted."
    exit 0
fi

echo "Creating release branch $RELEASE_BRANCH..."
git checkout -b "$RELEASE_BRANCH"

echo "$NEXT_VERSION_STR" > "$VERSION_FILE"

sed -i.bak "s/^SCRIPT_VERSION=.*/SCRIPT_VERSION=\"$NEXT_VERSION_STR\"/" "$SCRIPT_FILE"
if [ -f "${SCRIPT_FILE}.bak" ]; then
    rm "${SCRIPT_FILE}.bak"
fi

git add "$VERSION_FILE" "$SCRIPT_FILE"
git commit -m "Release $NEXT_VERSION_STR"

echo ""
echo "Release $NEXT_VERSION_STR prepared on branch $RELEASE_BRANCH."
if question_answered_with_yes "Push release branch to origin?"; then
    git push -u origin "$RELEASE_BRANCH"
    echo ""
    echo "Branch pushed to origin."
    echo ""
    echo "Next steps:"
    echo "1. Create a PR from $RELEASE_BRANCH to main"
    echo "   - Via web: Go to your git hosting and create a PR"
    echo "   - Or: gh pr create --base main --head $RELEASE_BRANCH"
    echo ""
    echo "2. After PR is merged, create a tag:"
    echo "   git checkout main && git pull"
    echo "   git tag -a $NEXT_VERSION_STR -m \"Release $NEXT_VERSION_STR\""
    echo "   git push origin $NEXT_VERSION_STR"
    echo ""
    echo "3. Gitea will create a release from the tag"
else
    echo ""
    echo "Release prepared locally. Push manually with:"
    echo "  git push -u origin $RELEASE_BRANCH"
    echo ""
    echo "Then create a PR to main via your git hosting."
fi