VERSION="${1:-}"

# Strip 'v' prefix if present
VERSION="${VERSION#v}"

# Validate semver format
if ! [[ "$VERSION" =~ ^[0-9]+\.[0-9]+\.[0-9]+$ ]]; then
    echo "Error: Invalid version format '$VERSION'"
    echo "Expected semantic version (e.g., 1.6.0)"
    exit 1
fi

echo "Releasing version: $VERSION"

# Check CHANGELOG.md entry exists
if ! grep -qE "^## \[$VERSION\]" CHANGELOG.md; then
    echo "Error: No CHANGELOG entry found for version $VERSION"
    echo "Add entry with header: ## [$VERSION] - $(date +%Y-%m-%d)"
    echo "Tip: Use '/changelog' to generate the entry."
    exit 1
fi
echo "CHANGELOG entry found"

# Check release doesn't already exist
if gh release view "v$VERSION" &>/dev/null; then
    echo "Error: Release v$VERSION already exists"
    echo "Delete first: gh release delete v$VERSION --yes"
    exit 1
fi
echo "Release does not exist, proceeding"

REPO_URL=$(gh repo view --json url -q '.url')

# Skip if link already exists
if grep -qE "^\[$VERSION\]:" CHANGELOG.md; then
    echo "Comparison link already exists"
else
    # Find previous version (second version header)
    PREV_VERSION=$(grep -E "^## \[[0-9]+\.[0-9]+\.[0-9]+\]" CHANGELOG.md \
        | head -2 | tail -1 | sed 's/.*\[\([0-9.]*\)\].*/\1/')

    if [[ "$PREV_VERSION" != "$VERSION" ]] && [[ -n "$PREV_VERSION" ]]; then
        COMPARE_LINK="[$VERSION]: $REPO_URL/compare/v$PREV_VERSION...v$VERSION"
    else
        COMPARE_LINK="[$VERSION]: $REPO_URL/releases/tag/v$VERSION"
    fi

    # Update [Unreleased] link and add version link
    sed -i.bak "s|\[Unreleased\]:.*|[Unreleased]: $REPO_URL/compare/v$VERSION...HEAD|" CHANGELOG.md
    sed -i.bak "/^\[Unreleased\]:/a\\
$COMPARE_LINK" CHANGELOG.md
    rm -f CHANGELOG.md.bak

    echo "Added comparison link for $VERSION"
fi

if ! git diff --quiet CHANGELOG.md 2>/dev/null; then
    echo "CHANGELOG.md has uncommitted changes."
    # Ask user: "CHANGELOG.md updated with comparison links. Commit and push to main?"
    # If confirmed:
    git add CHANGELOG.md
    git commit -m "docs: prepare release $VERSION"
    git push origin main
    echo "Changes committed and pushed"
fi

echo "Triggering release workflow for v$VERSION..."
gh workflow run release.yml -f version="$VERSION"
echo "Workflow triggered"

sleep 5

RUN_ID=$(gh run list --workflow=release.yml --limit=1 --json databaseId -q '.[0].databaseId')
REPO_URL=$(gh repo view --json url -q '.url')

echo "Monitoring workflow run $RUN_ID..."
echo "View at: $REPO_URL/actions/runs/$RUN_ID"

# Poll for completion
while true; do
    STATUS=$(gh run view "$RUN_ID" --json status -q '.status')
    if [[ "$STATUS" == "completed" ]]; then
        CONCLUSION=$(gh run view "$RUN_ID" --json conclusion -q '.conclusion')
        break
    fi
    echo "  Status: $STATUS..."
    sleep 5
done

if [[ "$CONCLUSION" == "success" ]]; then
    echo "Release v$VERSION created successfully!"
    echo "View: $REPO_URL/releases/tag/v$VERSION"
else
    echo "Workflow failed: $CONCLUSION"
    echo "Logs: $REPO_URL/actions/runs/$RUN_ID"
    exit 1
fi

# Create directories
mkdir -p scripts
mkdir -p .github/workflows/scripts

# Set permissions after writing files
chmod +x scripts/release.sh
chmod +x .github/workflows/scripts/validate-changelog.sh
chmod +x .github/workflows/scripts/extract-release-notes.sh
chmod +x .github/workflows/scripts/create-github-release.sh