{
  "contract_version": "gab_122_contract_v1",
  "gab_id": "GAB-122",
  "canonical_name": "ExerciseDragDropSort",
  "module_owner": "EdTechExerciseLearning",
  "renderer_key": "text_cta",
  "required_fields": [
    "gab_id",
    "exercise_id",
    "instruction",
    "question",
    "items",
    "zones"
  ],
  "optional_fields": [
    "title",
    "feedback_ok",
    "feedback_ko",
    "feedback_incomplete",
    "status_idle",
    "status_armed",
    "status_continue",
    "cta_label",
    "accessibility"
  ],
  "field_types": {
    "items": "array<{id:string, text:string, category:string}> — category doit correspondre à un zones[].id",
    "zones": "array<{id:string, label:string, icon:string, css_class:string}> — min 2 zones",
    "cta_label": "string — libellé du bouton Valider",
    "feedback_ok": "string — message si tri entièrement correct",
    "feedback_ko": "string — message si au moins un item mal classé",
    "feedback_incomplete": "string — message si des items non placés lors de la validation",
    "accessibility": "object{keyboard_navigable,focus_visible,prefers_reduced_motion,tap_to_place_pattern}"
  },
  "constraints": [
    "Chaque items[].category doit correspondre à un id présent dans zones[].",
    "Minimum 2 zones requises.",
    "Minimum 2 items requis.",
    "Pattern d'interaction : tap-to-place (sélection + placement), sans drag natif (accessibilité mobile).",
    "cta_label : libellé venant du JSON — jamais hardcodé en HTML."
  ],
  "blocked_conditions": [
    "items absent ou vide (BLOCKED)",
    "zones absent ou vide (BLOCKED)",
    "exercise_id absent (BLOCKED)"
  ],
  "accessibility": [
    "keyboard_navigable",
    "focus_visible",
    "prefers_reduced_motion",
    "tap_to_place_pattern_B"
  ],
  "qa_cases": [
    { "case": "instance conforme", "expected": "rendu complet avec pool + zones, 0 erreur" },
    { "case": "champ requis manquant (items vide)", "expected": "BLOCKED listant le champ" },
    { "case": "champ requis manquant (zones vide)", "expected": "BLOCKED listant le champ" },
    { "case": "exercise_id absent", "expected": "BLOCKED listant le champ" },
    { "case": "tri entièrement correct", "expected": "feedback_ok affiché, style ok" },
    { "case": "tri partiellement incorrect", "expected": "feedback_ko affiché, style ko" },
    { "case": "validation sans tout placer", "expected": "feedback_incomplete, pas de verdict" },
    { "case": "instance externe injectée via init(ext)", "expected": "le rendu change sans modifier le HTML" },
    { "case": "responsive 375/768/1024", "expected": "zones en colonne unique sur mobile, aucun débordement" }
  ],
  "traceability": {
    "derived_from_core_gab": "GAB-122",
    "note": "Ce schema VALIDE l'instance. Le contrat pédagogique complet (input_contract/validation_logic/feedback_scoring_logic) vit dans le CORE-GAB officiel, pas ici (évite la duplication)."
  }
}