{
  "paths": {
    "/availability/aggregate": {
      "get": {
        "tags": ["Availability"],
        "summary": "Get aggregate availability (public)",
        "description": "Returns merged busy time blocks across multiple calendars by their public tokens. No authentication required.",
        "operationId": "getAvailabilityAggregate",
        "parameters": [
          { "name": "tokens", "in": "query", "required": true, "schema": { "type": "string", "description": "Comma-separated calendar tokens from ical_url" }, "description": "Calendar tokens" },
          { "name": "start", "in": "query", "required": true, "schema": { "type": "string", "format": "date-time" }, "description": "Range start (RFC3339)" },
          { "name": "end", "in": "query", "required": true, "schema": { "type": "string", "format": "date-time" }, "description": "Range end (RFC3339)" }
        ],
        "responses": {
          "200": {
            "description": "Aggregate busy blocks",
            "content": {
              "application/json": {
                "schema": {
                  "type": "object",
                  "required": ["range_start", "range_end", "busy"],
                  "properties": {
                    "range_start": { "type": "string", "format": "date-time" },
                    "range_end": { "type": "string", "format": "date-time" },
                    "busy": { "type": "array", "items": { "$ref": "#/components/schemas/BusyBlock" } }
                  }
                }
              }
            }
          },
          "400": { "description": "Validation error", "content": { "application/json": { "schema": { "$ref": "#/components/schemas/Error" } } } }
        },
        "security": []
      }
    },
    "/availability/{token}": {
      "get": {
        "tags": ["Availability"],
        "summary": "Get availability by token (public)",
        "description": "Returns busy time blocks for a calendar by its public token. No authentication required.",
        "operationId": "getAvailabilityByToken",
        "parameters": [
          { "name": "token", "in": "path", "required": true, "schema": { "type": "string" }, "description": "Calendar token from ical_url" },
          { "name": "start", "in": "query", "required": true, "schema": { "type": "string", "format": "date-time" }, "description": "Range start (RFC3339)" },
          { "name": "end", "in": "query", "required": true, "schema": { "type": "string", "format": "date-time" }, "description": "Range end (RFC3339)" }
        ],
        "responses": {
          "200": {
            "description": "Busy blocks for the calendar",
            "content": {
              "application/json": {
                "schema": {
                  "type": "object",
                  "required": ["calendar_id", "range_start", "range_end", "busy"],
                  "properties": {
                    "calendar_id": { "type": "string", "format": "uuid" },
                    "range_start": { "type": "string", "format": "date-time" },
                    "range_end": { "type": "string", "format": "date-time" },
                    "busy": { "type": "array", "items": { "$ref": "#/components/schemas/BusyBlock" } }
                  }
                }
              }
            }
          },
          "400": { "description": "Validation error", "content": { "application/json": { "schema": { "$ref": "#/components/schemas/Error" } } } },
          "404": { "description": "Calendar not found", "content": { "application/json": { "schema": { "$ref": "#/components/schemas/Error" } } } }
        },
        "security": []
      }
    },
    "/availability": {
      "get": {
        "tags": ["Availability"],
        "summary": "Get calendar availability",
        "description": "Returns busy time blocks for a calendar within a given range. Includes expanded recurring event occurrences. User must have at least viewer role on the calendar. Requires `availability:read` scope.",
        "operationId": "getAvailability",
        "parameters": [
          { "name": "calendar_id", "in": "query", "required": true, "schema": { "type": "string", "format": "uuid" }, "description": "Calendar to query" },
          { "name": "start", "in": "query", "required": true, "schema": { "type": "string", "format": "date-time" }, "description": "Range start (RFC3339)" },
          { "name": "end", "in": "query", "required": true, "schema": { "type": "string", "format": "date-time" }, "description": "Range end (RFC3339)" }
        ],
        "responses": {
          "200": {
            "description": "Availability with busy blocks",
            "content": {
              "application/json": {
                "schema": {
                  "type": "object",
                  "required": ["calendar_id", "range_start", "range_end", "busy"],
                  "properties": {
                    "calendar_id": { "type": "string", "format": "uuid" },
                    "range_start": { "type": "string", "format": "date-time" },
                    "range_end": { "type": "string", "format": "date-time" },
                    "busy": {
                      "type": "array",
                      "items": { "$ref": "#/components/schemas/BusyBlock" }
                    }
                  }
                }
              }
            }
          },
          "400": { "description": "Validation error", "content": { "application/json": { "schema": { "$ref": "#/components/schemas/Error" } } } },
          "401": { "description": "Not authenticated", "content": { "application/json": { "schema": { "$ref": "#/components/schemas/Error" } } } },
          "403": { "description": "Insufficient scope or permission", "content": { "application/json": { "schema": { "$ref": "#/components/schemas/Error" } } } }
        }
      }
    }
  }
}