{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "questions.schema.json",
  "title": "LPIC-Simulator: Fragendatei",
  "description": "Fragenpaket für eine Prüfung. Datei-Header in 'meta' (Regel headers.md). Fachliche Regeln (genau 5 Optionen, Erläuterung je Option) prüft zusätzlich tools/build_bank.py.",
  "type": "object",
  "required": ["format", "exam", "questions"],
  "additionalProperties": false,
  "properties": {
    "$schema": { "type": "string" },
    "format": { "const": "lpic-sim-questions" },
    "meta": {
      "type": "object",
      "properties": {
        "file": { "type": "string" },
        "brief": { "type": "string" },
        "author": { "type": "string" },
        "owner": { "type": "string" },
        "assist": { "type": "string" },
        "version": { "type": "string" }
      }
    },
    "exam": { "type": "string", "description": "id der Prüfung aus exam.json, z. B. lpic1-101", "pattern": "^[a-z0-9-]+$" },
    "questions": { "type": "array", "items": { "$ref": "#/$defs/question" } }
  },
  "$defs": {
    "question": {
      "type": "object",
      "required": ["id", "objective", "type", "question", "explanation"],
      "additionalProperties": false,
      "properties": {
        "id": { "type": "string", "pattern": "^[0-9]{3}\\.[0-9]+-[0-9]{3}$", "description": "<objective>-<laufende Nr.>, z. B. 103.1-004" },
        "objective": { "type": "string", "pattern": "^[0-9]{3}\\.[0-9]+$" },
        "type": { "enum": ["single", "multi", "fill"], "description": "single: genau 1 richtig · multi: 2–4 richtig (Anzahl wird angezeigt) · fill: Lückentext" },
        "lang": { "type": "string", "default": "de" },
        "difficulty": { "type": "integer", "minimum": 1, "maximum": 3 },
        "question": { "type": "string", "description": "Fragetext; `Inline-Code` in Backticks, **fett** möglich" },
        "code": { "type": "string", "description": "optionaler mehrzeiliger Block (Ausgabe, Datei, Befehl)" },
        "options": {
          "type": "array",
          "minItems": 5,
          "maxItems": 5,
          "items": {
            "type": "object",
            "required": ["id", "text", "correct", "explanation"],
            "additionalProperties": false,
            "properties": {
              "id": { "enum": ["a", "b", "c", "d", "e"] },
              "text": { "type": "string" },
              "correct": { "type": "boolean" },
              "explanation": { "type": "string", "description": "Warum diese Option richtig bzw. falsch ist" }
            }
          }
        },
        "answers": { "type": "array", "minItems": 1, "items": { "type": "string" }, "description": "fill: akzeptierte Antworten (erste = Musterlösung)" },
        "case_sensitive": { "type": "boolean", "default": true },
        "explanation": { "type": "string", "description": "Gesamterläuterung zur Frage" },
        "references": { "type": "array", "items": { "type": "string" }, "description": "z. B. man 8 modprobe" },
        "review": {
          "type": "object",
          "description": "Prüfvermerk. Fehlt er, gilt pending. rejected wird nie in die Bank übernommen, mit --approved-only nur approved.",
          "required": ["status"],
          "additionalProperties": false,
          "properties": {
            "status": { "enum": ["pending", "approved", "rejected"] },
            "by": { "type": "string", "description": "Prüfer (Name oder Rolle)" },
            "date": { "type": "string", "pattern": "^\\d{4}-\\d{2}-\\d{2}$" },
            "note": { "type": "string", "description": "Begründung, v. a. bei rejected" }
          }
        }
      },
      "allOf": [
        { "if": { "properties": { "type": { "const": "fill" } } }, "then": { "required": ["answers"] }, "else": { "required": ["options"] } }
      ]
    }
  }
}