{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "title": "Workflow",
  "description": "Workflow composed of tasks",
  "type": "object",
  "required": [
    "tasks"
  ],
  "properties": {
    "tasks": {
      "type": "array",
      "items": {
        "$ref": "#/definitions/task"
      }
    }
  },
  "definitions": {
    "await_result": {
      "title": "Await result",
      "description": "Branches of a promise that is awaited",
      "oneOf": [
        {
          "type": "object",
          "properties": {
            "await/ok": {
              "$ref": "#/definitions/pointer"
            }
          }
        },
        {
          "type": "object",
          "properties": {
            "await/error": {
              "$ref": "#/definitions/pointer"
            }
          }
        },
        {
          "type": "object",
          "properties": {
            "await/*": {
              "$ref": "#/definitions/pointer"
            }
          }
        }
      ]
    },
    "ipld": {
      "title": "Ipld",
      "description": "DAG-JSON encoded IPLD: https://github.com/ipld/ipld/blob/master/specs/codecs/dag-json/spec.md",
      "oneOf": [
        {
          "type": "null"
        },
        {
          "type": "boolean"
        },
        {
          "type": "number"
        },
        {
          "type": "string"
        },
        {
          "$ref": "#/definitions/ipld_bytes"
        },
        {
          "type": "array"
        },
        {
          "type": "object"
        },
        {
          "$ref": "#/definitions/ipld_link"
        }
      ]
    },
    "ipld_bytes": {
      "title": "IPLD bytes",
      "description": "Base64 encoded binary",
      "type": "object",
      "properties": {
        "/": {
          "type": "object",
          "properties": {
            "bytes": {
              "type": "string"
            }
          }
        }
      }
    },
    "ipld_link": {
      "title": "IPLD link",
      "description": "CID link that points to some IPLD data",
      "type": "object",
      "properties": {
        "/": {
          "type": "string"
        }
      }
    },
    "pointer": {
      "description": "CID reference to an invocation, task, instruction, or receipt",
      "type": "object",
      "properties": {
        "/": {
          "type": "string"
        }
      }
    },
    "prf": {
      "description": "CIDs referencing UCAN proofs",
      "type": [
        "array"
      ],
      "items": {
        "type": "string"
      }
    },
    "resources": {
      "description": "Resource configuration for fuel quota, memory allowance, and timeout",
      "type": "object",
      "properties": {
        "fuel": {
          "type": [
            "integer",
            "null"
          ],
          "format": "uint64",
          "minimum": 0.0
        },
        "memory": {
          "description": "Memory in bytes",
          "type": [
            "integer",
            "null"
          ],
          "format": "uint64",
          "minimum": 0.0
        },
        "time": {
          "description": "Timeout in milliseconds",
          "type": [
            "integer",
            "null"
          ],
          "format": "uint64",
          "minimum": 0.0
        }
      }
    },
    "run": {
      "title": "Run instruction",
      "description": "An instruction that runs a function from a resource, executor that will run the function, inputs to the executor, and optional nonce",
      "type": "object",
      "if": {
        "properties": {
          "op": {
            "type": "string",
            "const": "wasm/run"
          }
        }
      },
      "then": {
        "properties": {
          "input": {
            "type": "object",
            "required": [
              "args",
              "func"
            ],
            "properties": {
              "args": {
                "description": "Arguments to the function. May await a result from another task.",
                "type": "array",
                "items": [
                  {
                    "$ref": "#/definitions/ipld"
                  },
                  {
                    "$ref": "#/definitions/await_result"
                  }
                ]
              },
              "func": {
                "description": "The function to call on the Wasm resource",
                "type": "string"
              }
            }
          }
        }
      },
      "else": false,
      "required": [
        "input",
        "nnc",
        "op",
        "rsc"
      ],
      "properties": {
        "nnc": {
          "description": "A 12-byte or 16-byte nonce encoded as IPLD bytes. Use empty string for no nonce.",
          "oneOf": [
            {
              "$ref": "#/definitions/ipld_bytes"
            },
            {
              "type": "string",
              "const": ""
            },
            {
              "description": "A 12-byte or 16-byte nonce encoded as a string, which expects to be decoded with Base32hex lower",
              "type": "string",
              "minLength": 1
            }
          ]
        },
        "op": {
          "description": "Function executor",
          "type": "string",
          "enum": [
            "wasm/run"
          ]
        },
        "rsc": {
          "type": "string",
          "format": "uri"
        }
      }
    },
    "task": {
      "description": "Contains a run instruction, configuration, optional reference to receipt that caused task to run, and authorization",
      "type": "object",
      "required": [
        "meta",
        "prf",
        "run"
      ],
      "properties": {
        "cause": {
          "title": "Receipt reference",
          "anyOf": [
            {
              "$ref": "#/definitions/pointer"
            },
            {
              "type": "null"
            }
          ]
        },
        "meta": {
          "title": "Task Configuration",
          "allOf": [
            {
              "$ref": "#/definitions/resources"
            }
          ]
        },
        "prf": {
          "title": "UCAN Authorization",
          "allOf": [
            {
              "$ref": "#/definitions/prf"
            }
          ]
        },
        "run": {
          "title": "Run instruction",
          "allOf": [
            {
              "$ref": "#/definitions/run"
            }
          ]
        }
      }
    }
  }
}