declare module "graphlib" {
    export interface GraphOptions {
        directed?: boolean | undefined; // default: true.
        multigraph?: boolean | undefined; // default: false.
        compound?: boolean | undefined; // default: false.
    }

    export interface Edge {
        v: string;
        w: string;
        /** The name that uniquely identifies a multi-edge. */
        name?: string | undefined;
    }

    export class Graph {
        constructor(options?: GraphOptions);

        /**
         * Sets the default node label. This label will be assigned as default label
         * in case if no label was specified while setting a node.
         * Complexity: O(1).
         *
         * @argument label - default node label.
         * @returns the graph, allowing this to be chained with other functions.
         */
        setDefaultNodeLabel(label: any): Graph;

        /**
         * Sets the default node label factory function. This function will be invoked
         * each time when setting a node with no label specified and returned value
         * will be used as a label for node.
         * Complexity: O(1).
         *
         * @argument labelFn - default node label factory function.
         * @returns the graph, allowing this to be chained with other functions.
         */
        setDefaultNodeLabel(labelFn: (v: string) => any): Graph;

        /**
         * Creates or updates the value for the node v in the graph. If label is supplied
         * it is set as the value for the node. If label is not supplied and the node was
         * created by this call then the default node label will be assigned.
         * Complexity: O(1).
         *
         * @argument name - node name.
         * @argument label - value to set for node.
         * @returns the graph, allowing this to be chained with other functions.
         */
        setNode(name: string, label?: any): Graph;

        /**
         * Invokes setNode method for each node in names list.
         * Complexity: O(|names|).
         *
         * @argument names - list of nodes names to be set.
         * @argument label - value to set for each node in list.
         * @returns the graph, allowing this to be chained with other functions.
         */
        setNodes(names: string[], label?: any): Graph;

        /**
         * Sets node p as a parent for node v if it is defined, or removes the
         * parent for v if p is undefined. Method throws an exception in case of
         * invoking it in context of noncompound graph.
         * Average-case complexity: O(1).
         *
         * @argument v - node to be child for p.
         * @argument p - node to be parent for v.
         * @returns the graph, allowing this to be chained with other functions.
         */
        setParent(v: string, p?: string): Graph;

        /**
         * Gets parent node for node v.
         * Complexity: O(1).
         *
         * @argument v - node to get parent of.
         * @returns parent node name or void if v has no parent.
         */
        // eslint-disable-next-line @typescript-eslint/no-invalid-void-type
        parent(v: string): string | void;

        /**
         * Gets list of direct children of node v.
         * Complexity: O(1).
         *
         * @argument v - node to get children of.
         * @returns children nodes names list.
         */
        children(v?: string): string[];

        /**
         * Creates new graph with nodes filtered via filter. Edges incident to rejected node
         * are also removed. In case of compound graph, if parent is rejected by filter,
         * than all its children are rejected too.
         * Average-case complexity: O(|E|+|V|).
         *
         * @argument filter - filtration function detecting whether the node should stay or not.
         * @returns new graph made from current and nodes filtered.
         */
        filterNodes(filter: (v: string) => boolean): Graph;

        /**
         * Sets the default edge label. This label will be assigned as default label
         * in case if no label was specified while setting an edge.
         * Complexity: O(1).
         *
         * @argument label - default edge label.
         * @returns the graph, allowing this to be chained with other functions.
         */
        setDefaultEdgeLabel(label: any): Graph;

        /**
         * Sets the default edge label factory function. This function will be invoked
         * each time when setting an edge with no label specified and returned value
         * will be used as a label for edge.
         * Complexity: O(1).
         *
         * @argument labelFn - default edge label factory function.
         * @returns the graph, allowing this to be chained with other functions.
         */
        setDefaultEdgeLabel(labelFn: (v: string) => any): Graph;

        /**
         * Establish an edges path over the nodes in nodes list. If some edge is already
         * exists, it will update its label, otherwise it will create an edge between pair
         * of nodes with label provided or default label if no label provided.
         * Complexity: O(|nodes|).
         *
         * @argument nodes - list of nodes to be connected in series.
         * @argument label - value to set for each edge between pairs of nodes.
         * @returns the graph, allowing this to be chained with other functions.
         */
        setPath(nodes: string[], label?: any): Graph;

        /**
         * Detects whether graph has a node with specified name or not.

         *
         * @argument name - name of the node.
         * @returns true if graph has node with specified name, false - otherwise.
         */
        hasNode(name: string): boolean;

        /**
         * Remove the node with the name from the graph or do nothing if the node is not in
         * the graph. If the node was removed this function also removes any incident
         * edges.
         * Complexity: O(1).
         *
         * @argument name - name of the node.
         * @returns the graph, allowing this to be chained with other functions.
         */
        removeNode(name: string): Graph;

        /**
         * Gets all nodes of the graph. Note, the in case of compound graph subnodes are
         * not included in list.
         * Complexity: O(1).
         *
         * @returns list of graph nodes.
         */
        nodes(): string[];

        /**
         * Gets the label of node with specified name.
         * Complexity: O(|V|).
         *
         * @returns label value of the node.
         */
        node(name: string): any;

        /**
         * Creates or updates the label for the edge (v, w) with the optionally supplied
         * name. If label is supplied it is set as the value for the edge. If label is not
         * supplied and the edge was created by this call then the default edge label will
         * be assigned. The name parameter is only useful with multigraphs.
         * Complexity: O(1).
         *
         * @argument v - edge source node.
         * @argument w - edge sink node.
         * @argument label - value to associate with the edge.
         * @argument name - unique name of the edge in order to identify it in multigraph.
         * @returns the graph, allowing this to be chained with other functions.
         */
        setEdge(v: string, w: string, label?: any, name?: string): Graph;

        /**
         * Creates or updates the label for the specified edge. If label is supplied it is
         * set as the value for the edge. If label is not supplied and the edge was created
         * by this call then the default edge label will be assigned. The name parameter is
         * only useful with multigraphs.
         * Complexity: O(1).
         *
         * @argument edge - edge descriptor.
         * @argument label - value to associate with the edge.
         * @returns the graph, allowing this to be chained with other functions.
         */
        setEdge(edge: Edge, label?: any): Graph;

        /**
         * Gets edges of the graph. In case of compound graph subgraphs are not considered.
         * Complexity: O(|E|).
         *
         * @return graph edges list.
         */
        edges(): Edge[];

        /**
         * Gets the label for the specified edge.
         * Complexity: O(1).
         *
         * @argument v - edge source node.
         * @argument w - edge sink node.
         * @argument name - name of the edge (actual for multigraph).
         * @returns value associated with specified edge.
         */
        edge(v: string, w: string, name?: string): any;

        /**
         * Gets the label for the specified edge.
         * Complexity: O(1).
         *
         * @argument edge - edge descriptor.
         * @returns value associated with specified edge.
         */
        edge(e: Edge): any;

        /**
         * Detects whether the graph contains specified edge or not. No subgraphs are considered.
         * Complexity: O(1).
         *
         * @argument v - edge source node.
         * @argument w - edge sink node.
         * @argument name - name of the edge (actual for multigraph).
         * @returns whether the graph contains the specified edge or not.
         */
        hasEdge(v: string, w: string, name?: string): boolean;

        /**
         * Detects whether the graph contains specified edge or not. No subgraphs are considered.
         * Complexity: O(1).
         *
         * @argument edge - edge descriptor.
         * @returns whether the graph contains the specified edge or not.
         */
        hasEdge(edge: Edge): boolean;

        /**
         * Removes the specified edge from the graph. No subgraphs are considered.
         * Complexity: O(1).
         *
         * @argument edge - edge descriptor.
         * @returns the graph, allowing this to be chained with other functions.
         */
        removeEdge(edge: Edge): Graph;

        /**
         * Removes the specified edge from the graph. No subgraphs are considered.
         * Complexity: O(1).
         *
         * @argument v - edge source node.
         * @argument w - edge sink node.
         * @argument name - name of the edge (actual for multigraph).
         * @returns the graph, allowing this to be chained with other functions.
         */
        removeEdge(v: string, w: string, name?: string): Graph;

        /**
         * Return all edges that point to the node v. Optionally filters those edges down to just those
         * coming from node u. Behavior is undefined for undirected graphs - use nodeEdges instead.
         * Complexity: O(|E|).
         *
         * @argument v - edge sink node.
         * @argument w - edge source node.
         * @returns edges descriptors list if v is in the graph, or undefined otherwise.
         */
        // eslint-disable-next-line @typescript-eslint/no-invalid-void-type
        inEdges(v: string, w?: string): void | Edge[];

        /**
         * Return all edges that are pointed at by node v. Optionally filters those edges down to just
         * those point to w. Behavior is undefined for undirected graphs - use nodeEdges instead.
         * Complexity: O(|E|).
         *
         * @argument v - edge source node.
         * @argument w - edge sink node.
         * @returns edges descriptors list if v is in the graph, or undefined otherwise.
         */
        // eslint-disable-next-line @typescript-eslint/no-invalid-void-type
        outEdges(v: string, w?: string): void | Edge[];

        /**
         * Returns all edges to or from node v regardless of direction. Optionally filters those edges
         * down to just those between nodes v and w regardless of direction.
         * Complexity: O(|E|).
         *
         * @argument v - edge adjacent node.
         * @argument w - edge adjacent node.
         * @returns edges descriptors list if v is in the graph, or undefined otherwise.
         */
        // eslint-disable-next-line @typescript-eslint/no-invalid-void-type
        nodeEdges(v: string, w?: string): void | Edge[];

        /**
         * Return all nodes that are predecessors of the specified node or undefined if node v is not in
         * the graph. Behavior is undefined for undirected graphs - use neighbors instead.
         * Complexity: O(|V|).
         *
         * @argument v - node identifier.
         * @returns node identifiers list or undefined if v is not in the graph.
         */
        // eslint-disable-next-line @typescript-eslint/no-invalid-void-type
        predecessors(v: string): void | string[];

        /**
         * Return all nodes that are successors of the specified node or undefined if node v is not in
         * the graph. Behavior is undefined for undirected graphs - use neighbors instead.
         * Complexity: O(|V|).
         *
         * @argument v - node identifier.
         * @returns node identifiers list or undefined if v is not in the graph.
         */
        // eslint-disable-next-line @typescript-eslint/no-invalid-void-type
        successors(v: string): void | string[];

        /**
         * Return all nodes that are predecessors or successors of the specified node or undefined if
         * node v is not in the graph.
         * Complexity: O(|V|).
         *
         * @argument v - node identifier.
         * @returns node identifiers list or undefined if v is not in the graph.
         */

        // eslint-disable-next-line @typescript-eslint/no-invalid-void-type
        neighbors(v: string): void | string[];

        /**
         * Whether graph was created with 'directed' flag set to true or not.
         *
         * @returns whether the graph edges have an orientation.
         */
        isDirected(): boolean;

        /**
         * Whether graph was created with 'multigraph' flag set to true or not.
         *
         * @returns whether the pair of nodes of the graph can have multiple edges.
         */
        isMultigraph(): boolean;

        /**
         * Whether graph was created with 'compound' flag set to true or not.
         *
         * @returns whether a node of the graph can have subnodes.
         */
        isCompound(): boolean;

        /**
         * Sets the label of the graph.
         *
         * @argument label - label value.
         * @returns the graph, allowing this to be chained with other functions.
         */
        setGraph(label: any): Graph;

        /**
         * Gets the graph label.
         *
         * @returns currently assigned label for the graph or undefined if no label assigned.
         */
        // eslint-disable-next-line @typescript-eslint/no-invalid-void-type
        graph(): void | string;

        /**
         * Gets the number of nodes in the graph.
         * Complexity: O(1).
         *
         * @returns nodes count.
         */
        nodeCount(): number;

        /**
         * Gets the number of edges in the graph.
         * Complexity: O(1).
         *
         * @returns edges count.
         */
        edgeCount(): number;

        /**
         * Gets list of nodes without in-edges.
         * Complexity: O(|V|).
         *
         * @returns the graph source nodes.
         */
        sources(): string[];

        /**
         * Gets list of nodes without out-edges.
         * Complexity: O(|V|).
         *
         * @returns the graph source nodes.
         */
        sinks(): string[];
    }

    export namespace json {
        /**
         * Creates a JSON representation of the graph that can be serialized to a string with
         * JSON.stringify. The graph can later be restored using json.read.
         *
         * @argument graph - target to create JSON representation of.
         * @returns JSON serializable graph representation
         */
        function write(graph: Graph): Object;

        /**
         * Takes JSON as input and returns the graph representation.
         *
         * @example
         * var g2 = graphlib.json.read(JSON.parse(str));
         * g2.nodes();
         * // ['a', 'b']
         * g2.edges()
         * // [ { v: 'a', w: 'b' } ]
         *
         * @argument json - JSON serializable graph representation
         * @returns graph constructed acccording to specified representation
         */
        function read(json: Object): Graph;
    }

    export interface Path {
        distance: number;
        predecessor: string;
    }

    export namespace alg {
        /**
         * Finds all connected components in a graph and returns an array of these components.
         * Each component is itself an array that contains the ids of nodes in the component.
         * Complexity: O(|V|).
         *
         * @argument graph - graph to find components in.
         * @returns array of nodes list representing components
         */
        function components(graph: Graph): string[][];

        /**
         * This function is an implementation of Dijkstra's algorithm which finds the shortest
         * path from source to all other nodes in graph. This function returns a map of
         * v -> { distance, predecessor }. The distance property holds the sum of the weights
         * from source to v along the shortest path or Number.POSITIVE_INFINITY if there is no path
         * from source. The predecessor property can be used to walk the individual elements of the
         * path from source to v in reverse order.
         * Complexity: O((|E| + |V|) * log |V|).
         *
         * @argument graph - graph where to search pathes.
         * @argument source - node to start pathes from.
         * @argument weightFn - function which takes edge e and returns the weight of it. If no weightFn
         * is supplied then each edge is assumed to have a weight of 1. This function throws an
         * Error if any of the traversed edges have a negative edge weight.
         * @argument edgeFn - function which takes a node v and returns the ids of all edges incident to it
         * for the purposes of shortest path traversal. By default this function uses the graph.outEdges.
         * @returns shortest pathes map that starts from node source
         */
        function dijkstra(
            graph: Graph,
            source: string,
            weightFn?: (e: Edge) => number,
            edgeFn?: (v: string) => Edge[],
        ): { [node: string]: Path };

        /**
         * This function finds the shortest path from each node to every other reachable node in
         * the graph. It is similar to alg.dijkstra, but instead of returning a single-source
         * array, it returns a mapping of source -> alg.dijksta(g, source, weightFn, edgeFn).
         * Complexity: O(|V| * (|E| + |V|) * log |V|).
         *
         * @argument graph - graph where to search pathes.
         * @argument weightFn - function which takes edge e and returns the weight of it. If no weightFn
         * is supplied then each edge is assumed to have a weight of 1. This function throws an
         * Error if any of the traversed edges have a negative edge weight.
         * @argument edgeFn - function which takes a node v and returns the ids of all edges incident to it
         * for the purposes of shortest path traversal. By default this function uses the graph.outEdges.
         * @returns shortest pathes map.
         */
        function dijkstraAll(
            graph: Graph,
            weightFn?: (e: Edge) => number,
            edgeFn?: (v: string) => Edge[],
        ): { [source: string]: { [node: string]: Path } };

        /**
         * Given a Graph, graph, this function returns all nodes that are part of a cycle. As there
         * may be more than one cycle in a graph this function return an array of these cycles,
         * where each cycle is itself represented by an array of ids for each node involved in
         * that cycle. Method alg.isAcyclic is more efficient if you only need to determine whether a graph has a
         * cycle or not.
         * Complexity: O(|V| + |E|).
         *
         * @argument graph - graph where to search cycles.
         * @returns cycles list.
         */
        function findCycles(graph: Graph): string[][];

        /**
         * Given a Graph, graph, this function returns true if the graph has no cycles and returns false if it
         * does. This algorithm returns as soon as it detects the first cycle. You can use alg.findCycles
         * to get the actual list of cycles in the graph.
         *
         * @argument graph - graph to detect whether it acyclic ot not.
         * @returns whether graph contain cycles or not.
         */
        function isAcyclic(graph: Graph): boolean;

        /**
         * This function is an implementation of the Floyd-Warshall algorithm, which finds the
         * shortest path from each node to every other reachable node in the graph. It is similar
         * to alg.dijkstraAll, but it handles negative edge weights and is more efficient for some types
         * of graphs. This function returns a map of source -> { target -> { distance, predecessor }.
         * The distance property holds the sum of the weights from source to target along the shortest
         * path of Number.POSITIVE_INFINITY if there is no path from source. The predecessor property
         * can be used to walk the individual elements of the path from source to target in reverse
         * order.
         * Complexity: O(|V|^3).
         *
         * @argument graph - graph where to search pathes.
         * @argument weightFn - function which takes edge e and returns the weight of it. If no weightFn
         * is supplied then each edge is assumed to have a weight of 1. This function throws an
         * Error if any of the traversed edges have a negative edge weight.
         * @argument edgeFn - function which takes a node v and returns the ids of all edges incident to it
         * for the purposes of shortest path traversal. By default this function uses the graph.outEdges.
         * @returns shortest pathes map.
         */
        function floydWarshall(
            graph: Graph,
            weightFn?: (e: Edge) => number,
            edgeFn?: (v: string) => Edge[],
        ): { [source: string]: { [node: string]: Path } };

        /**
         * Prim's algorithm takes a connected undirected graph and generates a minimum spanning tree. This
         * function returns the minimum spanning tree as an undirected graph. This algorithm is derived
         * from the description in "Introduction to Algorithms", Third Edition, Cormen, et al., Pg 634.
         * Complexity: O(|E| * log |V|);
         *
         * @argument graph - graph to generate a minimum spanning tree of.
         * @argument weightFn - function which takes edge e and returns the weight of it. It throws an Error if
         *           the graph is not connected.
         * @returns minimum spanning tree of graph.
         */
        function prim(graph: Graph, weightFn: (e: Edge) => number): Graph;

        /**
         * This function is an implementation of Tarjan's algorithm which finds all strongly connected
         * components in the directed graph g. Each strongly connected component is composed of nodes that
         * can reach all other nodes in the component via directed edges. A strongly connected component
         * can consist of a single node if that node cannot both reach and be reached by any other
         * specific node in the graph. Components of more than one node are guaranteed to have at least
         * one cycle.
         * Complexity: O(|V| + |E|).
         *
         * @argument graph - graph to find all strongly connected components of.
         * @return  an array of components. Each component is itself an array that contains
         *          the ids of all nodes in the component.
         */
        function tarjan(graph: Graph): string[][];

        /**
         * Given a Graph graph this function applies topological sorting to it.
         * If the graph has a cycle it is impossible to generate such a list and CycleException is thrown.
         * Complexity: O(|V| + |E|).
         *
         * @argument graph - graph to apply topological sorting to.
         * @returns an array of nodes such that for each edge u -> v, u appears before v in the array.
         */
        function topsort(graph: Graph): string[];

        /**
         * Performs pre-order depth first traversal on the input graph. If the graph is
         * undirected then this algorithm will navigate using neighbors. If the graph
         * is directed then this algorithm will navigate using successors.
         *
         * @argument graph - depth first traversal target.
         * @argument vs - nodes list to traverse.
         * @returns the nodes in the order they were visited as a list of their names.
         */
        function preorder(graph: Graph, vs: string[]): string[];

        /**
         * Performs post-order depth first traversal on the input graph. If the graph is
         * undirected then this algorithm will navigate using neighbors. If the graph
         * is directed then this algorithm will navigate using successors.
         *
         * @argument graph - depth first traversal target.
         * @argument vs - nodes list to traverse.
         * @returns the nodes in the order they were visited as a list of their names.
         */
        function postorder(graph: Graph, vs: string[]): string[];
    }
}