#!/bin/bash
set -e  # Exit on error

# Brainy Release Script
# Simple, reliable release workflow: build → test → commit → push → publish → release

# Colors for output
RED='\033[0;31m'
GREEN='\033[0;32m'
YELLOW='\033[1;33m'
BLUE='\033[0;34m'
NC='\033[0m' # No Color

# Parse arguments
RELEASE_TYPE="${1:-patch}"  # patch, minor, or major
SKIP_TESTS=false
DRY_RUN=false

for arg in "$@"; do
  case $arg in
    --skip-tests)
      SKIP_TESTS=true
      ;;
    --dry-run)
      DRY_RUN=true
      ;;
  esac
done

# An explicit version (e.g. "8.0.0-rc.1") may be passed in place of patch/minor/major.
EXPLICIT_VERSION=""
if [[ "$RELEASE_TYPE" =~ ^[0-9]+\.[0-9]+\.[0-9]+(-[0-9A-Za-z.-]+)?$ ]]; then
  EXPLICIT_VERSION="$RELEASE_TYPE"
fi

# Release on whatever branch we're on — RC lines live on feature branches, not main.
CURRENT_BRANCH="$(git rev-parse --abbrev-ref HEAD)"

echo -e "${BLUE}🚀 Brainy Release Script${NC}"
echo -e "${BLUE}Release type: ${RELEASE_TYPE}${NC}"
echo -e "${BLUE}Branch: ${CURRENT_BRANCH}${NC}\n"

if [ "$DRY_RUN" = true ]; then
  echo -e "${YELLOW}⚠️  DRY RUN MODE - No changes will be made${NC}\n"
fi

if [ "$SKIP_TESTS" = true ]; then
  echo -e "${YELLOW}⚠️  SKIPPING TESTS - Use with caution!${NC}\n"
fi

# Step 1: Verify clean git state
echo -e "${BLUE}1️⃣  Checking git status...${NC}"
if [ -n "$(git status --porcelain)" ]; then
  echo -e "${RED}❌ Working directory not clean. Commit or stash changes first.${NC}"
  exit 1
fi
echo -e "${GREEN}✅ Working directory clean${NC}\n"

# Step 2: Build
echo -e "${BLUE}2️⃣  Building project...${NC}"
if [ "$DRY_RUN" = false ]; then
  npm run build
fi
echo -e "${GREEN}✅ Build successful${NC}\n"

# Step 3: Test
if [ "$SKIP_TESTS" = false ]; then
  echo -e "${BLUE}3️⃣  Running tests...${NC}"
  if [ "$DRY_RUN" = false ]; then
    # Full CI gate: unit + integration (test:ci = test:ci-unit && test:ci-integration).
    npm run test:ci
  fi
  echo -e "${GREEN}✅ Tests passed${NC}\n"
else
  echo -e "${YELLOW}3️⃣  Skipping tests...${NC}\n"
fi

# Step 4: Get current and new version
CURRENT_VERSION=$(node -p "require('./package.json').version")
echo -e "${BLUE}Current version: ${CURRENT_VERSION}${NC}"

# Calculate new version
IFS='.' read -r -a VERSION_PARTS <<< "$CURRENT_VERSION"
MAJOR="${VERSION_PARTS[0]}"
MINOR="${VERSION_PARTS[1]}"
PATCH="${VERSION_PARTS[2]}"

if [ -n "$EXPLICIT_VERSION" ]; then
  NEW_VERSION="$EXPLICIT_VERSION"
else
  case $RELEASE_TYPE in
    major)
      NEW_VERSION="$((MAJOR + 1)).0.0"
      ;;
    minor)
      NEW_VERSION="${MAJOR}.$((MINOR + 1)).0"
      ;;
    patch)
      NEW_VERSION="${MAJOR}.${MINOR}.$((PATCH + 1))"
      ;;
    *)
      echo -e "${RED}❌ Invalid release type: ${RELEASE_TYPE}${NC}"
      echo "Usage: ./scripts/release.sh [patch|minor|major|<explicit-version>] [--dry-run]"
      exit 1
      ;;
  esac
fi

# A version with a hyphen (e.g. 8.0.0-rc.1) is a prerelease: publish under the 'rc'
# dist-tag (NOT 'latest') and mark the GitHub release as a prerelease.
PRERELEASE=false
NPM_TAG="latest"
if [[ "$NEW_VERSION" == *"-"* ]]; then
  PRERELEASE=true
  NPM_TAG="rc"
fi

echo -e "${BLUE}New version: ${NEW_VERSION}${NC}"
if [ "$PRERELEASE" = true ]; then
  echo -e "${YELLOW}⚠️  Prerelease → npm dist-tag '${NPM_TAG}', GitHub prerelease${NC}"
fi
echo ""

if [ "$DRY_RUN" = true ]; then
  echo -e "${YELLOW}DRY RUN: Would release version ${NEW_VERSION}${NC}"
  exit 0
fi

# Step 5: Bump version in package files
echo -e "${BLUE}4️⃣  Bumping version to ${NEW_VERSION}...${NC}"
npm version $NEW_VERSION --no-git-tag-version
echo -e "${GREEN}✅ Version bumped${NC}\n"

# Step 6: Update CHANGELOG
echo -e "${BLUE}5️⃣  Updating CHANGELOG...${NC}"
# Get commits since last tag
LAST_TAG=$(git describe --tags --abbrev=0 2>/dev/null || echo "")
if [ -z "$LAST_TAG" ]; then
  COMMITS=$(git log --oneline --pretty=format:"- %s (%h)")
else
  COMMITS=$(git log ${LAST_TAG}..HEAD --oneline --pretty=format:"- %s (%h)")
fi

# Create new changelog entry
CHANGELOG_ENTRY="### [${NEW_VERSION}](https://github.com/soulcraftlabs/brainy/compare/v${CURRENT_VERSION}...v${NEW_VERSION}) ($(date +%Y-%m-%d))

${COMMITS}
"

# Prepend to CHANGELOG.md after header
if [ -f "CHANGELOG.md" ]; then
  # Read header (first 4 lines)
  HEADER=$(head -n 4 CHANGELOG.md)
  # Read rest of file
  REST=$(tail -n +5 CHANGELOG.md)
  # Write new CHANGELOG
  echo "$HEADER" > CHANGELOG.md
  echo "" >> CHANGELOG.md
  echo "$CHANGELOG_ENTRY" >> CHANGELOG.md
  echo "" >> CHANGELOG.md
  echo "$REST" >> CHANGELOG.md
fi
echo -e "${GREEN}✅ CHANGELOG updated${NC}\n"

# Step 7: Create release commit
echo -e "${BLUE}6️⃣  Creating release commit...${NC}"
git add package.json package-lock.json CHANGELOG.md
git commit -m "chore(release): ${NEW_VERSION}"
echo -e "${GREEN}✅ Release commit created${NC}\n"

# Step 8: Create git tag
# Annotated (-a) so `git push --follow-tags` below actually pushes it. A lightweight tag is
# skipped by --follow-tags, which leaves the tag local-only and makes `gh release create` fail.
echo -e "${BLUE}7️⃣  Creating git tag v${NEW_VERSION}...${NC}"
git tag -a "v${NEW_VERSION}" -m "Release v${NEW_VERSION}"
echo -e "${GREEN}✅ Tag created${NC}\n"

# Step 9: Push to GitHub
echo -e "${BLUE}8️⃣  Pushing to GitHub...${NC}"
git push --follow-tags origin "$CURRENT_BRANCH"
echo -e "${GREEN}✅ Pushed to GitHub${NC}\n"

# Step 10: Publish to npm
echo -e "${BLUE}9️⃣  Publishing to npm (dist-tag: ${NPM_TAG})...${NC}"
npm publish --tag "$NPM_TAG"
# Brainy is the only PUBLIC @soulcraft package — verify visibility after every publish.
npm access get status @soulcraft/brainy || true
echo -e "${GREEN}✅ Published to npm${NC}\n"

# Step 11: Create GitHub release
echo -e "${BLUE}🔟 Creating GitHub release...${NC}"
if [ "$PRERELEASE" = true ]; then
  gh release create "v${NEW_VERSION}" --generate-notes --prerelease
else
  gh release create "v${NEW_VERSION}" --generate-notes
fi
echo -e "${GREEN}✅ GitHub release created${NC}\n"

echo -e "${GREEN}━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━${NC}"
echo -e "${GREEN}🎉 Release ${NEW_VERSION} complete!${NC}"
echo -e "${GREEN}━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━${NC}"
echo ""
echo -e "📦 npm: ${BLUE}https://www.npmjs.com/package/@soulcraft/brainy/v/${NEW_VERSION}${NC}"
echo -e "🐙 GitHub: ${BLUE}https://github.com/soulcraftlabs/brainy/releases/tag/v${NEW_VERSION}${NC}"