{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "hms/schemas/project/project_v1.schema.json",
  "title": "HMS Project v1",
  "description": "PLAN.md §10, §24: Projektdatei mit schema_version und stabilen UUIDs. Phase 0: Kernfelder; Layer-/Effektschnitt wird in Phase 2 vollständig ausgebaut.",
  "type": "object",
  "required": ["schema_version", "id", "name", "created_at", "updated_at", "compositions"],
  "properties": {
    "schema_version": {"const": 1},
    "id": {"type": "string", "format": "uuid"},
    "name": {"type": "string", "minLength": 1},
    "created_at": {"type": "string", "format": "date-time"},
    "updated_at": {"type": "string", "format": "date-time"},
    "settings": {"type": "object"},
    "media_assets": {"type": "array", "items": {"type": "object"}},
    "compositions": {
      "type": "array",
      "items": {
        "type": "object",
        "required": ["id", "name", "width", "height", "fps", "color_space", "layers"],
        "properties": {
          "id": {"type": "string", "format": "uuid"},
          "name": {"type": "string"},
          "width": {"type": "integer", "minimum": 16, "maximum": 8192},
          "height": {"type": "integer", "minimum": 16, "maximum": 8192},
          "fps": {"type": "number", "exclusiveMinimum": 0},
          "color_space": {"enum": ["sRGB", "linear"]},
          "background_color": {"type": "string"},
          "duration": {"type": ["number", "null"]},
          "layers": {
            "type": "array",
            "maxItems": 64,
            "items": {
              "type": "object",
              "required": ["id", "name", "layer_type"],
              "properties": {
                "id": {"type": "string", "format": "uuid"},
                "name": {"type": "string"},
                "enabled": {"type": "boolean"},
                "layer_type": {"enum": ["media", "image", "solid", "generator", "adjustment", "group"]},
                "opacity": {"type": "number", "minimum": 0, "maximum": 1},
                "blend_mode": {"enum": ["normal", "add", "multiply", "screen", "lighten", "darken", "difference", "overlay", "alpha_premultiplied"]},
                "effects": {
                  "type": "array",
                  "maxItems": 2,
                  "items": {"type": "object"}
                }
              }
            }
          }
        }
      }
    },
    "scenes": {"type": "array", "items": {"type": "object"}},
    "timelines": {"type": "array", "items": {"type": "object"}},
    "outputs": {"type": "array", "items": {"type": "object"}},
    "control_bindings": {"type": "array", "items": {"type": "object"}},
    "plugin_requirements": {"type": "array", "items": {"type": "object"}}
  }
}