name: Init

# One-shot bootstrap — runs on first push to main, skips if already initialised.
# Substitutes all __PROJECT_NAME__ / __MODULE_PATH__ placeholders (file contents
# and directory names), then runs context:sync to generate CLAUDE.md and friends.
# Deletes itself on completion so it never runs again.

on:
  push:
    branches: [main]

jobs:
  init:
    name: Bootstrap project from template
    runs-on: self-hosted

    steps:
      - uses: actions/checkout@v4
        with:
          fetch-depth: 0

      - name: Check if already initialised
        id: guard
        run: |
          if [ -f CLAUDE.md ]; then
            echo "skip=true" >> "$GITHUB_OUTPUT"
          else
            echo "skip=false" >> "$GITHUB_OUTPUT"
          fi

      - name: Derive project variables
        if: steps.guard.outputs.skip == 'false'
        id: vars
        run: |
          PROJECT_NAME=$(basename "$(git rev-parse --show-toplevel)")
          GITEA_HOST=$(git remote get-url origin | sed 's|http://||;s|https://||;s|/.*||')
          OWNER=$(git remote get-url origin | sed 's|.*://[^/]*/\([^/]*\)/.*|\1|')
          MODULE_PATH="${GITEA_HOST}/${OWNER}/${PROJECT_NAME}"
          echo "project_name=${PROJECT_NAME}" >> "$GITHUB_OUTPUT"
          echo "module_path=${MODULE_PATH}"   >> "$GITHUB_OUTPUT"
          echo "→ PROJECT_NAME=${PROJECT_NAME}"
          echo "→ MODULE_PATH=${MODULE_PATH}"

      - name: Configure git with token
        if: steps.guard.outputs.skip == 'false'
        env:
          GITEA_TOKEN: ${{ secrets.GITEA_TOKEN }}
        run: |
          REMOTE=$(git remote get-url origin)
          # Inject token into remote URL for push-back
          AUTH_REMOTE=$(echo "$REMOTE" | sed "s|http://|http://gitea-actions:${GITEA_TOKEN}@|")
          git remote set-url origin "$AUTH_REMOTE"
          git config user.name  "gitea-actions[bot]"
          git config user.email "gitea-actions[bot]@noreply.local"

      - name: Substitute placeholders in file contents
        if: steps.guard.outputs.skip == 'false'
        env:
          PROJECT_NAME: ${{ steps.vars.outputs.project_name }}
          MODULE_PATH:  ${{ steps.vars.outputs.module_path }}
        run: |
          set -euo pipefail
          while IFS= read -r f; do
            if grep -qE '__PROJECT_NAME__|__MODULE_PATH__' "$f" 2>/dev/null; then
              sed -i \
                -e "s|__PROJECT_NAME__|${PROJECT_NAME}|g" \
                -e "s|__MODULE_PATH__|${MODULE_PATH}|g" \
                "$f"
              echo "  substituted: $f"
            fi
          done < <(git ls-files | grep -v '^\.gitea/workflows/init\.yml$')

      - name: Rename templated directories
        if: steps.guard.outputs.skip == 'false'
        env:
          PROJECT_NAME: ${{ steps.vars.outputs.project_name }}
        run: |
          set -euo pipefail
          if [ -d "cmd/__PROJECT_NAME__" ]; then
            git mv "cmd/__PROJECT_NAME__" "cmd/${PROJECT_NAME}"
            echo "  renamed: cmd/__PROJECT_NAME__ → cmd/${PROJECT_NAME}"
          fi

      - name: Install task if missing
        if: steps.guard.outputs.skip == 'false'
        run: |
          which task 2>/dev/null || go install github.com/go-task/task/v3/cmd/task@latest

      - name: Run context:sync
        if: steps.guard.outputs.skip == 'false'
        run: task context:sync

      - name: Remove this init workflow
        if: steps.guard.outputs.skip == 'false'
        run: |
          git rm .gitea/workflows/init.yml
          echo "  removed: .gitea/workflows/init.yml"

      - name: Commit and push
        if: steps.guard.outputs.skip == 'false'
        env:
          PROJECT_NAME: ${{ steps.vars.outputs.project_name }}
        run: |
          git add -A
          git commit -m "chore: bootstrap ${PROJECT_NAME} from template"
          git push origin main
          echo "✓ project initialised"