/* @flow */

import Kefir from 'kefir';

import d3 from 'd3';

export type Event = any;

export type Value = any;

export type AllEvents = KefirStream;
export type EventMap = { [ event: string ]: KefirStream };

export type PatchDefinition = {
    handle?: { [event: string]: (event: Event) => void };
}

export type NodeDefinition = {
    title?: string;
    inlets?: { [alias: string]: InletDefinition };
    outlets?: { [alias: string]: OutletDefinition };
    prepare?: (inlets: { [alias: string]: Inlet },
               outlets: { [alias: string]: Outlet }
              ) => void;
    process?: (inlets_values: { [alias: string]: Value },
               prev_inlets_values?: { [alias: string]: Value }
              ) => void | { [ alias: string ]: Value | KefirStream };
    tune?: (updates_stream: KefirStream) => KefirStream;
    handle?: { [event: string]: (event: Event) => void };
}

export type NodeRendererDefinition = {
    size?: { width: number, height: number };
    first?: (body: HTMLElement,
             configIn?: KefirStream) =>
              void | { [ inlet_alias: string ]: {
                  default?: any,
                  valueOut?: KefirStream
              } };
     always?: (body: HTMLElement,
               inlets_values: { [alias: string]: Value },
               outlets_values: { [alias: string]: Value }
              ) => void;
}

export type InletDefinition = {
    type?: string;
    label?: string;
    default?: Value | KefirStream;
    hidden?: boolean;
    cold?: boolean;
    readonly?: boolean;
    allow?: Array<string>;
    accept?: (value: Value) => boolean;
    adapt?: (value: Value) => Value;
    show?: (value: Value) => string;
    tune?: (updates_stream: KefirStream) => KefirStream;
    handle?: { [event: string]: (event: Event) => void };
}

export type OutletDefinition = {
    type?: string;
    label?: string;
    show?: (value: Value) => string;
    tune?: (updates_stream: KefirStream) => KefirStream;
    handle?: { [event: string]: (event: Event) => void };
}

export type ChannelDefiniton = InletDefinition | OutletDefinition;

export type InletRendererDefinition = {
    show?: (target: HTMLElement, value: Value, repr: string) => void;
    edit?: (target: HTMLElement, inlet: Inlet, valueIn: KefirStream) => KefirStream;
};

export type OutletRendererDefinition = {
    show?: (target: HTMLElement, value: Value, repr: string) => void;
};

declare class Patch {
    Patch(name: string, def?: PatchDefinition): Patch;
    render(alias: string | Array<string>,
           targets: string | Array<string> | HTMLElement | Array<HTMLElement>,
           config?: RendererConfig
          ): Patch;
    addNode(type: string,
            title?: string,
            def?: NodeDefinition | (() => NodeDefinition)
           ): Node;
    removeNode(node: Node): Patch;
    open(parent: Patch): Patch;
    close(): Patch;
    inputs(list: Array<Inlet>): Patch;
    outputs(list: Array<Outlet>): Patch;
    project(node: Node): Patch;
    moveCanvas(x: number, y: number): Patch;
    resizeCanvas(width: number, height: number): Patch;
    event: EventMap;
    events: AllEvents;
}

declare class Node {
    Node(type: string,
         patch: Patch,
         def?: NodeDefinition,
         render?: NodeRendererDefinition | (() => NodeRendererDefinition),
         callback?: (node: Node) => void
        ): Node;
    turnOn(): Node;
    turnOff(): Node;
    addInlet(type: string,
             alias: string,
             def?: InletDefinition | (() => InletDefinition)
            ): Inlet;
    addOutlet(type: string,
              alias: string,
              def?: OutletDefinition | (() => OutletDefinition)
             ): Outlet;
    removeInlet(inlet: Inlet): Node;
    removeOutlet(outlet: Outlet): Node;
    move(x: number, y: number): Node;
    configure(props: any): Node;
    event: EventMap;
    events: AllEvents;
};

declare class Inlet {
    Inlet(type: string,
          node: Node,
          alias?: string,
          def?: InletDefinition | (() => InletDefinition),
          render?: InletRendererDefinition | (() => InletRendererDefinition)
         ): Inlet;
    receive(value: any): Inlet; // FIXME: value: any except KefirStream
    stream(stream: KefirStream): Inlet;
    toDefault(): Inlet;
    allows(outlet: Outlet): boolean;
    event: EventMap;
    events: AllEvents;
};

declare class Outlet {
    Outlet(type: string,
           node: Node,
           alias?: string,
           def?: OutletDefinition | (() => OutletDefinition),
           render?: OutletRendererDefinition | (() => OutletRendererDefinition)
          ): Outlet;
    connect(inlet: Inlet): Link;
    disconnect(link: Link): Outlet;
    send(value: any): Outlet; // FIXME: value: any except KefirStream
    stream(stream: KefirStream): Outlet;
    toDefault(): Outlet;
    event: EventMap;
    events: AllEvents;
};

declare class Link {
    Link(outlet: Outlet, inlet: Inlet, label?: string): Link;
    pass(value: any): Link;
    enable(): Link;
    disable(): Link;
    disconnect(): Link;
    event: EventMap;
    events: AllEvents;
};

export type ChannelRendererDefinition = InletRendererDefinition | OutletRendererDefinition;

export type RendererConfig = any; /* TODO */

export type KefirStream = Kefir.Observable<*>;

export type RendererDefinition = (Patch) => (
    (networkRoot: HTMLElement, config: RendererConfig) => {
        [ event: string ]: Value
    }
)

export type StyleDefinitionObject = {
    edgePadding?: { horizontal: number, vertical: number };
    boxPadding?: { horizontal: number, vertical: number };
    createCanvas: (patch: Patch, parent: HTMLElement) => { element: HTMLElement };
    createNode: (node: Node, render: NodeRendererDefinition,
                 description: string, icon: string
                ) => {
                       element: HTMLElement;
                       size?: { width: number, height: number };
                     };
    createInlet: (inlet: Inlet, render: InletRendererDefinition) => { element: HTMLElement };
    createOutlet: (outlet: Inlet, render: OutletRendererDefinition) => { element: HTMLElement };
    createLink: (link: Link) => { element: HTMLElement /* TODO */ };
    getInletPos: (inlet: Inlet) => { x: number, y: number };
    getOutletPos: (outlet: Outlet) => { x: number, y: number };
    getLocalPos: (pos: { x: number, y: number }) => { x: number, y: number };
    onPatchSwitch?: (patch: Patch, canvas: HTMLElement) => void;
    onNodeRemove?: (node: Node) => void;
}

export type StyleDefinition = ((config: any) => StyleDefinitionObject);

export type IOModule = any; /* TODO */

export type NavigationModule = any; /* TODO */

export type Stringify = {
    patch: (Patch) => String;
    node: (Node) => String;
    inlet: (Inlet) => String;
    outlet: (Outlet) => String;
    link: (Link) => String;
}

export type AutoStringify = (Patch | Node | Inlet | Outlet | Link) => String;

declare var HiddenTypes : {
    Patch: typeof Patch;
    Node: typeof Node;
    Inlet: typeof Inlet;
    Outlet: typeof Outlet;
    Link: typeof Link;
}

declare var Rpd : {
    VERSION: string;

    d3: typeof d3;
    //Rpd: typeof Rpd;

    _: typeof HiddenTypes;

    Patch: typeof Patch;
    Node: typeof Node;
    Inlet: typeof Inlet;
    Outlet: typeof Outlet;
    Link: typeof Link;

    event: EventMap;
    events: AllEvents;

    // registration
    nodetype(type: string, def: NodeDefinition | (() => NodeDefinition)): void;
    channeltype(type: string, def: ChannelDefiniton | (() => ChannelDefiniton)): void;
    renderer(alias: string, def: RendererDefinition): void;
    noderenderer(type: string, alias: string, def: NodeRendererDefinition | (() => NodeRendererDefinition)): void;
    channelrenderer(type: string, alias: string, def: ChannelRendererDefinition | (() => ChannelRendererDefinition)): void;
    nodedescription(type: string, description: string): void;
    style(alias: string, renderer: string, def: StyleDefinition): void;
    toolkiticon(toolkit: string, icon: string): void;
    nodetypeicon(type: string, icon: string): void;

    addPatch(name?: string, def?: PatchDefinition, parent?: Patch): Patch;
    addClosedPatch(name?: string, def?: PatchDefinition): Patch;
    renderNext(alias: string | Array<string>,
               target: Array<string> | string | HTMLElement | Array<HTMLElement>,
               config?: RendererConfig): void;
    stopRendering(): void;

    stringify: Stringify;
    autoStringify: AutoStringify;
};

module.exports = Rpd;