name: Create Release

on:
  workflow_call:
    inputs:
      tag:
        description: 'Full commit SHA for tagging'
        required: true
        type: string
      branch:
        description: 'Branch name used as release tag suffix (e.g. canary_experimental)'
        default: 'canary_experimental'
        type: string

jobs:
  release:
    runs-on: ubuntu-latest

    permissions:
      contents: write

    steps:
      - name: Checkout repository for git log access
        uses: actions/checkout@v6
        with:
          fetch-depth: 0

      - name: Build release notes
        id: notes
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          REPO: ${{ github.repository }}
        run: |-
          FULL_SHA="${{ inputs.tag }}"
          SHORT_SHA="${FULL_SHA::7}"
          BRANCH="${{ inputs.branch }}"
          TAG_NAME="$SHORT_SHA"
          TITLE="${SHORT_SHA}_$BRANCH"

          echo "tag_name=$TAG_NAME" >> $GITHUB_OUTPUT
          echo "title=$TITLE" >> $GITHUB_OUTPUT

          PREV_TAG=$(gh release list \
            --repo "$REPO" \
            --limit 1 \
            --json tagName \
            --jq '.[0].tagName' 2>/dev/null || echo)

          if [ -n "$PREV_TAG" ]; then
            PREV_SHA=$(git rev-parse "${PREV_TAG}^{}" 2>/dev/null || \
                       git rev-parse "${PREV_TAG}" 2>/dev/null || echo)
          fi

          if [ -n "$PREV_SHA" ]; then
            COMMITS=$(git log --format='- %s (`%h`)' --abbrev=7 "${PREV_SHA}..$FULL_SHA" --)
            COMPARE_URL="https://github.com/${REPO}/compare/${PREV_TAG}...$TAG_NAME"
          else
            COMMITS=$(git log --format='- %s (`%h`)' --abbrev=7 -1 "$FULL_SHA" --)
          fi

          # Assemble body
          {
            echo "body<<RELEASE_BODY_EOF"

            if [ -n "$COMMITS" ]; then
              echo "### Changes"
              echo
              echo "$COMMITS"
            fi

            if [ -n "$COMPARE_URL" ]; then
              echo
              echo "**Full changelog**: $COMPARE_URL"
            fi

            echo "RELEASE_BODY_EOF"
          } >> $GITHUB_OUTPUT

      - name: Download artifacts
        uses: actions/download-artifact@v8
        with:
          path: release_assets
          merge-multiple: true

      - name: Create GitHub Release
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          REPO: ${{ github.repository }}
          TAG: ${{ steps.notes.outputs.tag_name }}
          TITLE: ${{ steps.notes.outputs.title }}
          BODY: ${{ steps.notes.outputs.body }}
          TARGET: ${{ inputs.tag }}
        run: |-
          echo "$BODY" > release_notes.md
          echo "Creating release: $TAG"

          # Check if tag/release already exists (re-run safety)
          if gh release view "$TAG" --repo "$REPO" --json tagName 2>/dev/null; then
            echo "Release $TAG exists, uploading new assets..."
            gh release upload "$TAG" \
              --repo "$REPO" \
              --clobber \
              release_assets/*
          else
            gh release create "$TAG" \
              --repo "$REPO" \
              --target "${{ inputs.tag }}" \
              --title "$TITLE" \
              --notes-file release_notes.md \
              --latest \
              release_assets/*
          fi

          echo "✅ Release $TAG published"