#!/bin/bash
set -euo pipefail

MAIN_BRANCH="master"
DEVELOP_BRANCH="develop"
VALID_LEVELS="major minor patch"

# ── Validation ────────────────────────────────────────────────────────────────
if [ -z "${1:-}" ]; then
  echo "ERROR: Must specify the release level: major, minor, patch" >&2
  exit 1
fi

RELEASE_LEVEL="$1"

if ! echo "$VALID_LEVELS" | grep -qw "$RELEASE_LEVEL"; then
  echo "ERROR: Invalid release level '$RELEASE_LEVEL'. Must be one of: $VALID_LEVELS" >&2
  exit 1
fi

# ── Pre-flight checks ────────────────────────────────────────────────────────
BRANCH=$(git rev-parse --abbrev-ref HEAD)

# Ensure we're in a git repo
if ! git rev-parse --is-inside-work-tree >/dev/null 2>&1; then
  echo "ERROR: Not inside a git repository" >&2
  exit 1
fi

# Check for a clean working tree
if ! git diff --quiet || ! git diff --cached --quiet; then
  echo "ERROR: Working tree has uncommitted changes. Commit or stash before releasing." >&2
  git status --short >&2
  exit 1
fi

# Verify both remotes exist
for remote in origin dtp; do
  if ! git remote get-url "$remote" >/dev/null 2>&1; then
    echo "ERROR: Git remote '$remote' not found" >&2
    exit 1
  fi
done

# Verify branches exist locally
for branch in "$MAIN_BRANCH" "$DEVELOP_BRANCH"; do
  if ! git rev-parse --verify "$branch" >/dev/null 2>&1; then
    echo "ERROR: Branch '$branch' does not exist locally" >&2
    exit 1
  fi
done

# ── Save starting branch for rollback ────────────────────────────────────────
STARTING_BRANCH="$BRANCH"

# ── Step 1: Update develop and bump version ──────────────────────────────────
echo ">>> Switching to $DEVELOP_BRANCH..."
git checkout "$DEVELOP_BRANCH"

echo ">>> Bumping version ($RELEASE_LEVEL)..."
NEW_VERSION=$(npm version "$RELEASE_LEVEL" -m "release: %s")
echo "    Version bumped to $NEW_VERSION"

# ── Step 2: Push develop + tags to both remotes ──────────────────────────────
echo ">>> Pushing $DEVELOP_BRANCH to origin..."
git push origin "$DEVELOP_BRANCH" --follow-tags

echo ">>> Pushing $DEVELOP_BRANCH to dtp..."
git push dtp "$DEVELOP_BRANCH" --follow-tags

# ── Step 3: Merge develop into master ────────────────────────────────────────
echo ">>> Switching to $MAIN_BRANCH..."
git checkout "$MAIN_BRANCH"

echo ">>> Merging $DEVELOP_BRANCH into $MAIN_BRANCH..."
git merge "$DEVELOP_BRANCH"

# ── Step 4: Push master + tags to both remotes ───────────────────────────────
echo ">>> Pushing $MAIN_BRANCH to origin..."
git push origin "$MAIN_BRANCH" --follow-tags

echo ">>> Pushing $MAIN_BRANCH to dtp..."
git push dtp "$MAIN_BRANCH" --follow-tags

# ── Step 5: Return to develop ────────────────────────────────────────────────
echo ">>> Switching back to $DEVELOP_BRANCH..."
git checkout "$DEVELOP_BRANCH"

echo ">>> Release $NEW_VERSION complete!"