{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://raw.githubusercontent.com/api-evangelist/nasa-mars/main/json-schema/photo.json",
  "title": "Photo",
  "description": "A single Mars rover photo record returned by the NASA Mars Rover Photos API.",
  "type": "object",
  "properties": {
    "id": {
      "type": "integer",
      "description": "Unique identifier for the photo."
    },
    "sol": {
      "type": "integer",
      "minimum": 0,
      "description": "Martian rotation (sol) on which the photo was taken, counting from the rover's landing date."
    },
    "camera": {
      "$ref": "#/$defs/Camera"
    },
    "img_src": {
      "type": "string",
      "format": "uri",
      "description": "URL of the full-resolution image hosted on NASA servers."
    },
    "earth_date": {
      "type": "string",
      "format": "date",
      "description": "Earth date on which the photo was taken (YYYY-MM-DD)."
    },
    "rover": {
      "$ref": "#/$defs/RoverSummary"
    }
  },
  "required": ["id", "sol", "camera", "img_src", "earth_date", "rover"],
  "$defs": {
    "Camera": {
      "title": "Camera",
      "description": "Camera that captured the photo.",
      "type": "object",
      "properties": {
        "id": {
          "type": "integer"
        },
        "name": {
          "type": "string",
          "description": "Camera abbreviation (e.g., FHAZ, NAVCAM, MAST)."
        },
        "rover_id": {
          "type": "integer"
        },
        "full_name": {
          "type": "string",
          "description": "Full camera name (e.g., Front Hazard Avoidance Camera)."
        }
      },
      "required": ["id", "name", "rover_id", "full_name"]
    },
    "RoverSummary": {
      "title": "RoverSummary",
      "description": "Summary rover metadata embedded in photo records.",
      "type": "object",
      "properties": {
        "id": {
          "type": "integer"
        },
        "name": {
          "type": "string",
          "enum": ["Curiosity", "Opportunity", "Spirit", "Perseverance"]
        },
        "landing_date": {
          "type": "string",
          "format": "date"
        },
        "launch_date": {
          "type": "string",
          "format": "date"
        },
        "status": {
          "type": "string",
          "enum": ["active", "complete"]
        }
      },
      "required": ["id", "name", "landing_date", "launch_date", "status"]
    }
  }
}