import { ContextDefinition, JsonLdDocument } from "./jsonld";
import {
    Frame,
    JsonLdArray,
    JsonLdObj,
    JsonLdProcessor as JsonLdProcessorInterface,
    RemoteDocument,
    Url,
} from "./jsonld-spec";
export * from "./jsonld";

// Some typealiases for better readability and some placeholders
type MimeNQuad = "application/n-quads";
type RdfDataSet = object; // Placeholder
type RdfOrString = RdfDataSet | string;
type Callback<T> = (err: Error, res: T) => void;

/*
 * Declares interfaces used to type the methods options object.
 * The interfaces are usefull to avoid code replication.
 */

export namespace Options {
    interface DocLoader {
        documentLoader?:
            | ((url: Url, callback: (err: Error, remoteDoc: RemoteDocument) => void) => Promise<RemoteDocument>)
            | undefined;
    }

    interface Common extends DocLoader {
        base?: string | undefined;
        expandContext?: ContextDefinition | undefined;
    }

    interface ExpMap {
        // TODO: Figure out type of info
        expansionMap?: ((info: any) => any) | undefined;
    }

    interface Compact extends Common, ExpMap {
        compactArrays?: boolean | undefined;
        appropriate?: boolean | undefined;
        compactToRelative?: boolean | undefined;
        graph?: boolean | undefined;
        skipExpansion?: boolean | undefined;
        expansion?: boolean | undefined;
        framing?: boolean | undefined;
        // TODO: Figure out type of info
        compactionMap?: ((info: any) => void) | undefined;
    }

    interface Expand extends Common, ExpMap {
        keepFreeFloatingNodes?: boolean | undefined;
    }

    type Flatten = Common;

    interface Frame {
        embed?: "@last" | "@always" | "@never" | "@link" | undefined;
        explicit?: boolean | undefined;
        requireAll?: boolean | undefined;
        omitDefault?: boolean | undefined;
        omitGraph?: boolean | undefined;
    }

    interface Normalize extends Common {
        algorithm?: "URDNA2015" | `URGNA2012` | undefined;
        skipExpansion?: boolean | undefined;
        expansion?: boolean | undefined;
        inputFormat?: MimeNQuad | undefined;
        format?: MimeNQuad | undefined;
        useNative?: boolean | undefined;
    }

    interface FromRdf {
        format?: MimeNQuad | undefined;
        rdfParser?: any;
        useRdfType?: boolean | undefined;
        useNativeTypes?: boolean | undefined;
    }

    interface ToRdf extends Common {
        skipExpansion?: boolean | undefined;
        format?: MimeNQuad | undefined;
        produceGeneralizedRdf?: boolean | undefined;
    }

    // TODO Complete and uncomment if needed (see comments at the end of the file)
    /* NOT USED AT THE MOMENT
    // type Link = Common;
    interface Issuer {

        issuer?: IdentifierIssuer;   // a jsonld.IdentifierIssuer to use to label blank nodes.
    }

    type CreateNodeMap = Common&Issuer;

    interface Merge extends Common, Issuer{

        mergeNodes?: boolean;    //true to merge properties for nodes with the same ID,
        //false to ignore new properties for nodes with the same ID once
        //the ID has been defined; note that this may not prevent merging
        //new properties where a node is in the `object` position
        //(default: true).
    }

    interface Get {
        documentLoader?: DocLoader;  // the document loader to use.
    }

    type ProcessContext = DocLoader;
    */
}

export function compact(
    input: JsonLdDocument,
    ctx: ContextDefinition,
    options: Options.Compact,
    callback: Callback<JsonLdObj>,
): void;
export function compact(input: JsonLdDocument, ctx: ContextDefinition, callback: Callback<JsonLdObj>): void;
export function compact(input: JsonLdDocument, ctx?: ContextDefinition, options?: Options.Compact): Promise<JsonLdObj>;

export function expand(input: JsonLdDocument, options: Options.Expand, callback: Callback<JsonLdArray>): void;
export function expand(input: JsonLdDocument, callback: Callback<JsonLdArray>): void;
export function expand(input: JsonLdDocument, options?: Options.Expand): Promise<JsonLdArray>;

export function flatten(
    input: JsonLdDocument,
    ctx: ContextDefinition | null,
    options: Options.Flatten,
    callback: Callback<JsonLdObj>,
): void;
export function flatten(input: JsonLdDocument, ctx: ContextDefinition | null, callback: Callback<JsonLdObj>): void;
export function flatten(input: JsonLdDocument, ctx?: ContextDefinition, options?: Options.Flatten): Promise<JsonLdObj>;

export function frame(input: JsonLdDocument, frame: Frame, options: Options.Frame, callback: Callback<JsonLdObj>): void;
export function frame(input: JsonLdDocument, frame: Frame, callback: Callback<JsonLdObj>): void;
export function frame(input: JsonLdDocument, frame: Frame, options?: Options.Frame): Promise<JsonLdObj>;

export function normalize(input: JsonLdDocument, options: Options.Normalize, callback: Callback<string>): void;
export function normalize(input: JsonLdDocument, callback: Callback<string>): void;
export function normalize(input: JsonLdDocument, options?: Options.Normalize): Promise<string>;

export const canonize: typeof normalize;

export function fromRDF(dataset: RdfOrString, options: Options.FromRdf, callback: Callback<JsonLdArray>): void;
export function fromRDF(dataset: RdfOrString, callback: Callback<JsonLdArray>): void;
export function fromRDF(dataset: RdfOrString, options?: Options.FromRdf): Promise<JsonLdArray>;

export function toRDF(input: JsonLdDocument, callback: Callback<RdfOrString>): void;
export function toRDF(input: JsonLdDocument, options: Options.ToRdf, callback: Callback<RdfOrString>): void;
export function toRDF(input: JsonLdDocument, options?: Options.ToRdf): Promise<RdfOrString>;

export let JsonLdProcessor: JsonLdProcessorInterface;

// disable autoexport
export {};

// TODO: Complete and export the following types if needed!
// ************************************************************************************
// Not exported because of experimental state
// export function link(input: Document, ctx: Context, options: Options.Link, callback: DocCallback): void;
// export function link(input: Document, ctx: Context, callback: DocCallback): void;
// export function link(input: Document, ctx: Context, options?: Options.Link): Promise<JsonLd>;

// Not exported because of experimental state
// export function createNodeMapn(input: Document, options: Options.CreateNodeMap, callback: Callback<MegedNodeMap>): void;
// export function createNodeMapn(input: Document, callback: Callback<MegedNodeMap>): void;
// export function createNodeMapn(input: Document, options: Options.CreateNodeMap): Promise<MegedNodeMap>;

// Not exported because of experimental state
// export function merge (docs: Document, ctx: Context, options: Options.Merge, callback: DocCallback): void;
// export function merge (docs: Document, ctx: Context, callback: DocCallback): void;
// export function merge (docs: Document, ctx: Context, options: Options.Merge): Promise<JsonLd>;

/*
export namespace documentLoader {
  function get(): NormalizedDocLoader;
  function set(v: DocLoader): void;
}
*/

// default document loader not implemented
// export function documentLoader(url: Url): DocLoader;

/**
 * Deprecated default document loader. Do not use or override.
 */
// export function loadDocument(url: Url): Promise<DocLoader>;

// export function get (url: Url, options: Options.Get): Promise<JsonLd>;

// export function processContext(activeCtx: Context, localCtx: Context, options: Options.ProcessContext): Promise<Context>;

// backwards compatibility
// export function getContextValue(ctx: Context, key: string, type: JsonLDType): any;
/**
 * Document loaders.
 */
/*
export namespace documentLoaders {
  let node: DocLoader;
  let xhr: DocLoader;
}

export type DocumentLoaders = 'node' | 'xhr';
*/

// export function useDocumentLoader (type: DocumentLoaders, ...params: any): void;

// type ParserFunction = (input: string, callback: (err: Error, dataset: RdfDataSet) => Promise<RdfDataSet|null|undefined>) => void;
// export function registerRDFParser (contentType: MimeType, parser: ParserFunction): void;

// export function unregisterRDFParser (contentType: MimeType): void;

// TODO Still originial source code. Maybe build additional types from it
// ******************************************************************************
/* URL API */
// jsonld.url = require('./url');
/* Utility API */
// jsonld.util = util;
// backwards compatibility
// Object.assign(jsonld, util);

// reexpose API as jsonld.promises for backwards compatability
// jsonld.promises = jsonld;

// backwards compatibility
// declare module 'RequestQueue';

// ******************************************************************************