name: "Validate JSON by JSON Schema"
description: "Validates JSON files using their $schema reference"
author: "Timo Behrendt <t.behrendt@t00n.de>"

inputs:
  json-file:
    description: "The JSON file to validate"
    required: true

runs:
  using: "composite"
  steps:
    - name: Extract schema
      shell: bash
      run: |
        schema=$(jq -r '.["$schema"]' < ${{ inputs.json-file }})
        if [ -n "$schema" ]; then
          curl -s $schema > schema.json
        else
          exit 0
        fi
    - name: Update the schema to the latest version
      shell: bash
      run: |
        npx ajv migrate -i schema.json -o schema.json
    - name: Validate JSON
      shell: bash
      run: |
        npx ajv validate -s schema.json -d ${{ inputs.json-file }}