# Copyright 2022 The IREE Authors
#
# Licensed under the Apache License v2.0 with LLVM Exceptions.
# See https://llvm.org/LICENSE.txt for license information.
# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
#
# Sets up a github workflow.
# It is designed to be called from a parent workflow.
# The concurrency of this workflow is controlled by the caller's job.

name: Setup

on:
  workflow_call:
    outputs:
      should-run:
        description: |
          Whether CI should run.
        value: ${{ jobs.setup.outputs.should-run }}
      is-pr:
        description: |
          Whether the workflow has been triggered by a pull request.
        value: ${{ jobs.setup.outputs.is-pr }}
      runner-env:
        description: |
          The runner environment to use.
        value: ${{ jobs.setup.outputs.runner-env }}
      runner-group:
        description: |
          The runner group to use.
        value: ${{ jobs.setup.outputs.runner-group }}
      write-caches:
        description: |
          Whether to write to caches.
        value: ${{ jobs.setup.outputs.write-caches }}
      benchmark-presets:
        description: |
          A comma-separated string of benchmarks to run.
        value: ${{ jobs.setup.outputs.benchmark-presets }}


env:
  # This duplicates the variable from ci.yml. The variable needs to be in env
  # instead of the outputs of setup because it contains the run attempt and we
  # want that to be the current attempt, not whatever attempt the setup step
  # last ran in. It therefore can't be passed in via inputs because the env
  # context isn't available there.
  GCS_DIR: gs://iree-github-actions-${{ github.event_name == 'pull_request' && 'presubmit' || 'postsubmit' }}-artifacts/${{ github.run_id }}/${{ github.run_attempt }}

jobs:
  setup:
    runs-on: ubuntu-20.04
    env:
      # The commit being checked out is the merge commit for the PR. Its first
      # parent will be the tip of main.
      BASE_REF: HEAD^
    outputs:
      should-run: ${{ steps.configure.outputs.should-run }}
      is-pr: ${{ steps.configure.outputs.is-pr }}
      runner-env: ${{ steps.configure.outputs.runner-env }}
      runner-group: ${{ steps.configure.outputs.runner-group }}
      write-caches: ${{ steps.configure.outputs.write-caches }}
      benchmark-presets: ${{ steps.configure.outputs.benchmark-presets }}
    steps:
      - name: "Checking out repository"
        uses: actions/checkout@ac593985615ec2ede58e132d2e21d2b1cbd6127c # v3.3.0
        with:
          # We need the parent commit to do a diff
          fetch-depth: 2
      - name: "Fetching PR description"
        # We fetch the latest pull request data (description, labels, ...) from
        # API instead of using stale one from pull_request event. This makes it
        # possible to update the trailers, labels on the pull request and re-run
        # the workflow to make them take effect.
        # This is majorly for triggering benchmarks without pushing new commits.
        # See https://github.com/openxla/iree/issues/10042#issuecomment-1449250094
        # for more details.
        id: fetch-pr
        if: github.event_name == 'pull_request'
        env:
          PR_NUMBER: ${{ github.event.number }}
          PR_JSON: pull_request.json
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        run: |
          gh api "/repos/${GITHUB_REPOSITORY}/pulls/${PR_NUMBER}" > "${PR_JSON}"
          # It requires delimiter to pass multiline strings through
          # GITHUB_OUTPUT. Since these are already escaped JSON strings, pass
          # the JSON strings and later use fromJSON to decode them.
          echo "pr-title=$(jq '.title' ${PR_JSON})" >> "${GITHUB_OUTPUT}"
          echo "pr-body=$(jq '.body' ${PR_JSON})" >> "${GITHUB_OUTPUT}"
          echo "pr-branch=$(jq '.head.ref' ${PR_JSON})" >> "${GITHUB_OUTPUT}"
          # Use --compact-output to avoid multiline JSON.
          echo "pr-labels=$(jq --compact-output '.labels | map(.name)' \
            ${PR_JSON})" >> "${GITHUB_OUTPUT}"
      - name: "Configuring CI options"
        id: configure
        env:
          PR_TITLE: ${{ fromJSON(steps.fetch-pr.outputs.pr-title || '""') }}
          PR_BODY: ${{ fromJSON(steps.fetch-pr.outputs.pr-body || '""') }}
          PR_BRANCH: ${{ fromJSON(steps.fetch-pr.outputs.pr-branch || '""') }}
          PR_LABELS: ${{ steps.fetch-pr.outputs.pr-labels || '[]' }}
          ORIGINAL_PR_TITLE: ${{ github.event.pull_request.title }}
          ORIGINAL_PR_BODY: ${{ github.event.pull_request.body }}
          ORIGINAL_PR_LABELS: ${{ toJSON(github.event.pull_request.labels.*.name) }}
        run: |
          # Just informative logging. There should only be two commits in the
          # history here, but limiting the depth helps when copying from a local
          # repo instead of using checkout, e.g. with
          # https://github.com/nektos/act where there will be more.
          git log --oneline --graph --max-count=3

          ./build_tools/github_actions/configure_ci.py

      - name: "Show benchmark presets"
        env:
          BENCHMARK_PRESETS: ${{ steps.configure.outputs.benchmark-presets }}
        run: |
          echo ":stopwatch: Enabled benchmarks: \`${BENCHMARK_PRESETS}\`" \
            >> "${GITHUB_STEP_SUMMARY}"