name: SDK API Spec Generation

on:
  push:
    branches:
      - main
    paths:
      - 'fern/**'
  workflow_dispatch:

concurrency:
  group: sdk-api-spec-${{ github.ref }}
  cancel-in-progress: true

jobs:
  generate-sdk-api-specs:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout repository
        uses: actions/checkout@v4

      - name: Install pnpm
        uses: pnpm/action-setup@v2
        with:
          version: 9

      - name: Setup Node.js
        uses: actions/setup-node@v4
        with:
          node-version: "24"
          cache: "pnpm"

      - name: Install dependencies
        run: pnpm install

      - name: Generate SDK specs
        env:
          FERN_TOKEN: ${{ secrets.FERN_TOKEN }}
        run: npx fern-api generate --api server --force

      - name: Update Python SDK
        env:
          GH_ACCESS_TOKEN: ${{ secrets.GH_ACCESS_TOKEN }}
        run: |
          # Clone langfuse-python repository
          git clone https://github.com/langfuse/langfuse-python.git ../langfuse-python
          cd ../langfuse-python

          git config user.name "langfuse-bot"
          git config user.email "langfuse-bot@langfuse.com"
          echo "$GH_ACCESS_TOKEN" | gh auth login --with-token
          gh auth setup-git

          # Delete existing API contents
          rm -rf langfuse/api/*

          # Copy generated Python SDK files
          cp -r ../langfuse/generated/python/* langfuse/api/

          # Remove unnecessary integration tests created by Fern
          # (could not find the right option to prevent this in generation step)
          rm -rf langfuse/api/tests

          # Install poetry and format
          pip install poetry
          poetry install --all-extras
          poetry run ruff format langfuse/api

          # Check for changes and show diff for debugging
          if git diff --quiet; then
            echo "No changes detected in Python SDK"
            exit 0
          fi

          # Close existing api-spec-bot PRs
          gh pr list --author langfuse-bot --state open --json number --jq '.[].number' | xargs -I {} gh pr close {}

          # Get the GitHub username of the original commit author
          cd ../langfuse
          ORIGINAL_AUTHOR=$(gh api repos/langfuse/langfuse/commits/${GITHUB_SHA} --jq '.author.login')
          cd ../langfuse-python

          # Create new branch and push changes
          BRANCH_NAME="api-spec-bot-${GITHUB_SHA::7}"
          git checkout -b "$BRANCH_NAME"
          git add .
          git commit -m "feat(api): update API spec from langfuse/langfuse ${GITHUB_SHA::7}"
          git push origin "$BRANCH_NAME"

          # Create PR with original author as reviewer
          gh pr create --title "feat(api): update API spec from langfuse/langfuse ${GITHUB_SHA::7}" --body "" --reviewer "$ORIGINAL_AUTHOR"

      - name: Update TypeScript SDK
        env:
          GH_ACCESS_TOKEN: ${{ secrets.GH_ACCESS_TOKEN }}
        run: |
          # Clone langfuse-js repository
          git clone https://github.com/langfuse/langfuse-js.git ../langfuse-js
          cd ../langfuse-js

          # Configure git
          git config user.name "langfuse-bot"
          git config user.email "langfuse-bot@langfuse.com"
          echo "$GH_ACCESS_TOKEN" | gh auth login --with-token
          gh auth setup-git

          # Delete existing API contents
          rm -rf packages/core/src/api/*

          # Copy generated TypeScript SDK files
          cp -r ../langfuse/generated/typescript/* packages/core/src/api/

          # Patch compilation error inducing output
          # Without this patch, the JS SDK will not build due to
          # "Error: packages/core build: src/api/core/auth/index.ts(1,10): error TS1205: Re-exporting a type when 'isolatedModules' is enabled requires using 'export type'."
          if [ -f "packages/core/src/api/core/auth/index.ts" ]; then
            if grep -q '^export { AuthProvider } from "./AuthProvider.js";$' packages/core/src/api/core/auth/index.ts; then
              sed -i '1s/^export { AuthProvider }/export { type AuthProvider }/' packages/core/src/api/core/auth/index.ts
            fi
          fi

          # Install dependencies and format
          npm install -g pnpm
          pnpm install
          pnpm format

          # Check for changes and show diff for debugging
          if git diff --quiet; then
            echo "No changes detected in TypeScript SDK"
            exit 0
          fi

          # Close existing api-spec-bot PRs
          gh pr list --author langfuse-bot --state open --json number --jq '.[].number' | xargs -I {} gh pr close {}

          # Get the GitHub username of the original commit author
          cd ../langfuse
          ORIGINAL_AUTHOR=$(gh api repos/langfuse/langfuse/commits/${GITHUB_SHA} --jq '.author.login')
          cd ../langfuse-js

          # Create new branch and push changes
          BRANCH_NAME="api-spec-bot-${GITHUB_SHA::7}"
          git checkout -b "$BRANCH_NAME"
          git add .
          git commit -m "feat(api): update API spec from langfuse/langfuse ${GITHUB_SHA::7}" --no-verify
          git push origin "$BRANCH_NAME"

          # Create PR with original author as reviewer
          gh pr create --title "feat(api): update API spec from langfuse/langfuse ${GITHUB_SHA::7}" --body "" --reviewer "$ORIGINAL_AUTHOR"