{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://schemas.aftech.internal/article-consolidation/v1/candidates-payload.schema.json",
  "x-contract-version": "1.0.0",
  "title": "CandidatesPayload",
  "description": "Normalized candidate payload supplied to LLM hygiene prompt (projection of internal CandidateObjects)",
  "type": "object",
  "required": [
    "language",
    "selected_extractor",
    "metadata_candidates",
    "block_candidates",
    "link_candidates",
    "image_candidates"
  ],
  "properties": {
    "language": {
      "type": "string"
    },
    "selected_extractor": {
      "type": "string",
      "enum": ["trafilatura", "newspaper4k", "readability"]
    },
    "metadata_candidates": {
      "type": "object",
      "required": ["title_candidates", "subtitle_candidates", "author_candidates"],
      "properties": {
        "title_candidates": {
          "type": "array",
          "items": {
            "type": "object",
            "required": ["candidate_id", "source", "text"],
            "properties": {
              "candidate_id": { "type": "string" },
              "source": { "type": "string" },
              "text": { "type": "string" }
            },
            "additionalProperties": false
          }
        },
        "subtitle_candidates": {
          "type": "array",
          "items": {
            "type": "object",
            "required": ["candidate_id", "source", "text"],
            "properties": {
              "candidate_id": { "type": "string" },
              "source": { "type": "string" },
              "text": { "type": "string" }
            },
            "additionalProperties": false
          }
        },
        "author_candidates": {
          "type": "array",
          "items": {
            "type": "object",
            "required": ["candidate_id", "source", "text"],
            "properties": {
              "candidate_id": { "type": "string" },
              "source": { "type": "string" },
              "text": { "type": "string" }
            },
            "additionalProperties": false
          }
        }
      },
      "additionalProperties": false
    },
    "block_candidates": {
      "type": "array",
      "items": {
        "type": "object",
        "required": ["candidate_id", "type", "order_index", "text", "source_extractor"],
        "properties": {
          "candidate_id": { "type": "string" },
          "type": {
            "type": "string",
            "enum": ["paragraph", "heading", "list_item", "quote"]
          },
          "order_index": { "type": "integer" },
          "text": { "type": "string" },
          "source_extractor": {
            "type": "string",
            "enum": ["trafilatura", "newspaper4k", "readability"]
          },
          "equivalences": {
            "type": "array",
            "items": { "type": "string" }
          }
        },
        "additionalProperties": false
      }
    },
    "link_candidates": {
      "type": "array",
      "items": {
        "type": "object",
        "required": ["candidate_id", "url", "anchor_text", "parent_block_id"],
        "properties": {
          "candidate_id": { "type": "string" },
          "url": { "type": "string" },
          "anchor_text": { "type": "string" },
          "parent_block_id": { "type": "string" }
        },
        "additionalProperties": false
      }
    },
    "image_candidates": {
      "type": "array",
      "items": {
        "type": "object",
        "required": ["candidate_id", "url"],
        "properties": {
          "candidate_id": { "type": "string" },
          "url": { "type": "string" },
          "alt": { "type": ["string", "null"] },
          "caption": { "type": ["string", "null"] },
          "parent_block_id": { "type": ["string", "null"] }
        },
        "additionalProperties": false
      }
    }
  },
  "additionalProperties": false
}