-- Default public interface of Fluence nodes

alias Field : []string
alias Argument : []string
alias Bytes : []u8
alias PeerId : string
alias Pairs : [][]string
alias Base58String : string
alias Hash : string

-- There are two types of dependencies: named and by-hash. 
-- name:foobar      – specifies dependency by module name, points to a module with import name 'foobar'
-- hash:04dc884...  – specifies dependency by module hash
-- By-hash dependencies are preffered since they are deteremenistic 
-- while by-name dependency can yield different modules at different points in time
alias Dependency : string

data Service:
    id: string
    blueprint_id: string
    owner_id: string

data FunctionSignature:
    arguments: []Argument
    name: string
    output_types: []string

data RecordType:
    fields: []Field
    id: u64
    name: string

data Interface:
    function_signatures: []FunctionSignature
    record_types: []RecordType

data Info:
    external_addresses: []string

data ModuleConfig:
    name: string

data Module:
    name: string
    hash: string
    config: ModuleConfig

data AddBlueprint:
    name: string
    dependencies: []Dependency

data Blueprint:
    id: string
    name: string
    dependencies: []Dependency

data ScriptInfo:
    id: string
    src: string
    failures: u32
    interval: string
    owner: string

data Contact:
    peer_id: string
    addresses: []string

service Op("op"):
    -- does nothing
    noop()
    -- returns length of the passed array
    array_length(array: []string) -> u32
    -- takes any number of arguments and wraps them into a single array
    array(a: string, b: ?string, c: ?string, d: ?string) -> []string
    -- takes any number of arrays and flattens them by concatenating
    concat(a: []string, b: ?[]string, c: ?[]string, d: ?[]string) -> []string
    -- takes a single argument and returns it back
    identity(s: ?string) -> ?string
    string_to_b58(s: string) -> Base58String
    string_from_b58(b: Base58String) -> string
    bytes_to_b58(bs: []u8) -> Base58String
    bytes_from_b58(b: Base58String) -> []u8
    -- Applies SHA256 to the given string
    -- Argument: s - string to apply sha256 to (hash is applied to utf8 bytes of s)
    -- Returns: returns sha256 multihash encoded as base58
    sha256_string(s: string) -> Base58String
    
    -- concatenate strings (in AIR it takes any number of arguments)
    concat_strings(a: string, b: string) -> string

service Peer("peer"):
    -- Checks if there is a direct connection to the peer identified by a given PeerId
    -- Argument: PeerId – id of the peer to check if there's a connection with
    -- Returns: bool - true if connected to the peer, false otherwise
    is_connected(peer: PeerId) -> bool

    -- Initiates a connection to the specified peer
    -- Arguments:
    --  id - id of the target peer
    --  multiaddrs – an array of target peer's addresses
    -- Returns: bool - true if connection was successful
    connect(id: PeerId, multiaddrs: ?[]string) -> bool
    -- Resolves the contact of a peer via Kademlia
    -- Argument: PeerId – id of the target peer
    -- Returns: Contact - true if connection was successful
    get_contact(peer: PeerId) -> Contact

    -- Get information about the peer
    identify() -> Info

    -- Get Unix timestamp in milliseconds
    timestamp_ms() -> u64

    -- Get Unix timestamp in seconds
    timestamp_sec() -> u64

service Kademlia("kad"):
    -- Instructs node to return the locally-known nodes
    -- in the Kademlia neighborhood for a given key
    -- Arguments:
    --  key – base58 string
    --  already_hashed – default false; if set to true, key is considered to be a SHA256 multihash
    --  count – default 20; limits number of returned nodes
    neighborhood(key: Base58String, already_hashed: ?bool, count: ?u32) -> []PeerId
    -- Merges given lists and sorts them by distance to target
    -- Arguments:
    --  target – base58 string; result is sorted by XOR distance to target
    --  left – list of base58 strings
    --  right – list of base58 strings
    --  count – how many items to return, unlimited by default
    -- Returns: list of base58 strings sorted by distance to target; list will contain at most count elements
    merge(target: Base58String, left: []string, right: []string, count: ?u32) -> []string

service Srv("srv"):
    -- Used to create a service on a certain node
    -- Arguments:
    --  blueprint_id – ID of the blueprint that has been added to the node specified in the service call by the dist add_blueprint service.
    -- Returns: service_id – the service ID of the created service.
    create(blueprint_id: string) -> string

    -- Used to remove a service from a certain node
    -- Arguments:
    --  service_id – ID of the service to remove
    remove(service_id: string)

    -- Returns a list of services running on a peer
    list() -> []Service

    -- Adds an alias on service, so, service could be called
    -- not only by service_id but by alias as well.
    -- Arguments:
    --  alias - settable service name
    --  service_id – ID of the service whose interface you want to name.
    add_alias(alias: string, service_id: string)

    -- Resolves given alias to a service id
    -- If there's no such alias, throws an error
    -- Returns: service id associated with the given alias
    resolve_alias(alias: string) -> string

    -- Retrieves the functional interface of a service running
    -- on the node specified in the service call
    -- Argument: service_id – ID of the service whose interface you want to retrieve.
    get_interface(service_id: string) -> Interface

service Dist("dist"):
    -- Constructs a ModuleConfig structure
    -- Arguments:
    --  module_name        - import name of the module
    --  mem_pages_count    - Maximum memory size accessible by a module in Wasm pages (64 Kb)
    --  logger_enabled     - Defines whether Marine should provide a special host log_utf8_string function for this module
    --  preopened_files    - Files available for this module. Module can access only files from this list
    --  envs               - environment variables available for this module
    --  mapped_dirs        - Directory mapping, e.g. [["/sites", "./web/data"]] so all 
    --                       reads & writes to /sites will actually to go ./web/data
    --  mounted_binaries   - Mapping of host binaries available to call from module, 
    --                       e.g. [["curl", "/usr/bin/curl"]] will allow module to 
    --                       call /usr/bin/curl binary as function 'curl'
    --  logging_mask       - Binary mask to enable & disable logging targets. Targets are
    --                       configured in WasmLoggerBuilder::with_target_map
    --  mem_pages_count    - Maximum memory size accessible by a module in Wasm pages (64 Kb)
    make_module_config(name: string, mem_pages_count: ?u32, logger_enabled: ?bool, preopened_files: ?[]string, envs: ?Pairs, mapped_dirs: ?Pairs, mounted_binaries: ?Pairs, logging_mask: ?i32) -> ModuleConfig

    -- Constructs a ModuleConfig structure
    -- Arguments:
    --  module_name        - import name of the module
    default_module_config(module_name: string) -> ModuleConfig


    -- Used to add modules to the node specified in the service call
    -- Arguments:
    --  bytes – a base64 string containing the .wasm module to add.
    --  config – module info
    --  Returns: blake3 hash of the module
    add_module(wasm_b56_content: Bytes, conf: ModuleConfig) -> string

    -- Adds module by copying it from Particle Vault directory
    -- Arguments:
    --  path   – path or a filename
    --  config - module config
    add_module_from_vault(path: string, config: ModuleConfig) -> Hash

    -- Get a list of modules available on the node
    list_modules() -> []Module

    -- Get the interface of a module
    get_interface(module_id: string) -> Interface

    -- Creates Blueprint structure from from blueprint name and dependencies (modules)
    make_blueprint(name: string, dependencies: []Dependency) -> AddBlueprint
    -- Add a blueprint to the node
    add_blueprint(blueprint: AddBlueprint) -> string

    -- Used to get the blueprints available on the node specified in the service call.
    -- A blueprint is an object of the following structure
    list_blueprints() -> []Blueprint

service Script("script"):
    -- Adds the given script to a node
    -- Arguments:
    --  air_script - raw AIR script without any undefined variables
    --  interval   - if not set, script will be ran only once
    --               if set, script will be ran once in the interval 
    --               (NOTE: actual interval may vary by up to 3 seconds)
    -- TODO: change interval to ?u64 when node API is updated
    add(air_script: string, interval: ?string) -> string

    -- Removes recurring script from a node. Only a creator of the script can delete it
    remove(script_id: string) -> bool

    -- Returns a list of existing scripts on the node.
    -- Each object in the list is of the following structure
    list() -> ScriptInfo