name: get-envoy-versions

# Reads the canonical ENVOY_VERSIONS file for either the current branch or a specified version of Consul,
# and returns both the max and all supported Envoy versions.

on:
  workflow_call:
    inputs:
      ref:
        description: |
          The Consul ref/branch (e.g. release/1.18.x) for which to determine supported Envoy versions.
          If not provided, the default actions/checkout value (current ref) is used.
        type: string
    outputs:
      max-envoy-version:
        description: The max supported Envoy version for the specified Consul version
        value: ${{ jobs.get-envoy-versions.outputs.max-envoy-version }}
      envoy-versions:
        description: |
          All supported Envoy versions for the specified Consul version (formatted as multiline string with one version 
          per line, in descending order)
        value: ${{ jobs.get-envoy-versions.outputs.envoy-versions }}
      envoy-versions-json:
        description: |
          All supported Envoy versions for the specified Consul version (formatted as JSON array)
        value: ${{ jobs.get-envoy-versions.outputs.envoy-versions-json }}

jobs:
  get-envoy-versions:
    name: "Determine supported Envoy versions"
    runs-on: ubuntu-latest
    outputs:
      max-envoy-version: ${{ steps.get-envoy-versions.outputs.max-envoy-version }}
      envoy-versions: ${{ steps.get-envoy-versions.outputs.envoy-versions }}
      envoy-versions-json: ${{ steps.get-envoy-versions.outputs.envoy-versions-json }}
    steps:
      - uses: actions/checkout@0ad4b8fadaa221de15dcec353f45205ec38ea70b # v4.1.4
        with:
          # If not set, will default to current branch.
          ref: ${{ inputs.ref }}
      - name: Determine Envoy versions
        id: get-envoy-versions
        # Note that this script assumes that the ENVOY_VERSIONS file is in the envoyextensions/xdscommon directory.
        # If in the future this file moves between branches, we could introduce a workflow input for the path that
        # defaults to the new value, and manually configure the old value as needed.
        run: |
          MAX_ENVOY_VERSION=$(cat envoyextensions/xdscommon/ENVOY_VERSIONS | grep '^[[:digit:]]' | sort -nr | head -n 1)
          ENVOY_VERSIONS=$(cat envoyextensions/xdscommon/ENVOY_VERSIONS | grep '^[[:digit:]]' | sort -nr)
          ENVOY_VERSIONS_JSON=$(echo -n '[' && echo "${ENVOY_VERSIONS}" | awk '{printf "\"%s\",", $0}' | sed 's/,$//' && echo -n ']')
          
          # Loop through each line of ENVOY_VERSIONS and compare it to the regex
          while IFS= read -r version; do
            if ! [[ $version =~ ^[0-9]+\.[0-9]+\.[0-9]+$ ]]; then
              echo 'Invalid version in ENVOY_VERSIONS: '$version' does not match the pattern ^[0-9]+\.[0-9]+\.[0-9]+$'
              exit 1
            fi
          done <<< "$ENVOY_VERSIONS"
          if ! [[ $MAX_ENVOY_VERSION =~ ^[0-9]+\.[0-9]+\.[0-9]+$ ]]; then
            echo 'Invalid MAX_ENVOY_VERSION: '$MAX_ENVOY_VERSION' does not match the pattern ^[0-9]+\.[0-9]+\.[0-9]+$'
            exit 1
          fi
          
          echo "Supported Envoy versions:"
          echo "${ENVOY_VERSIONS}"
          echo "envoy-versions<<EOF" >> $GITHUB_OUTPUT
          echo "${ENVOY_VERSIONS}" >> $GITHUB_OUTPUT
          echo "EOF" >> $GITHUB_OUTPUT
          echo "Supported Envoy versions JSON: ${ENVOY_VERSIONS_JSON}"
          echo "envoy-versions-json=${ENVOY_VERSIONS_JSON}" >> $GITHUB_OUTPUT
          echo "Max supported Envoy version: ${MAX_ENVOY_VERSION}"
          echo "max-envoy-version=${MAX_ENVOY_VERSION}" >> $GITHUB_OUTPUT