import type { RMap } from '@rimbu/collection-types';
import type { Stream, Streamable } from '@rimbu/stream';

import type {
  EdgeValuedGraphCreators,
  ValuedGraphElement,
} from '@rimbu/graph/custom';
import {
  type EdgeValuedGraphBase,
  ValuedGraphContext,
} from '@rimbu/graph/custom';

/**
 * A type-invariant immutable valued edge (undirected) graph.
 * See the [Graph documentation](https://rimbu.org/docs/collections/graph) and the [EdgeValuedGraph API documentation](https://rimbu.org/api/rimbu/graph/EdgeValuedGraph/interface)
 * @typeparam N - the node type
 * @typeparam V - the connection value type
 */
export interface EdgeValuedGraph<N, V>
  extends EdgeValuedGraphBase<N, V, EdgeValuedGraph.Types> {}

export namespace EdgeValuedGraph {
  /**
   * A non-empty type-invariant immutable valued edge (undirected) graph.
   * See the [Graph documentation](https://rimbu.org/docs/collections/graph) and the [EdgeValuedGraph API documentation](https://rimbu.org/api/rimbu/graph/EdgeValuedGraph/interface)
   * @typeparam N - the node type
   * @typeparam V - the connection value type
   */
  export interface NonEmpty<N, V>
    extends EdgeValuedGraphBase.NonEmpty<N, V, EdgeValuedGraph.Types>,
      Omit<
        EdgeValuedGraph<N, V>,
        keyof EdgeValuedGraphBase.NonEmpty<any, any, any>
      >,
      Streamable.NonEmpty<ValuedGraphElement<N, V>> {
    /**
     * Returns a non-empty `Stream` containing all graph elements of this collection as single tuples for isolated nodes
     * and 3-valued tuples containing the source node, target node, and connection value for connections.
     * @example
     * ```ts
     * EdgeValuedGraphHashed.of([1, 2, 'a'], [2, 3, 'b']).stream().toArray()
     * // => [[1, 2, 'a'], [2, 3, 'b']]
     * ```
     */
    stream(): Stream.NonEmpty<ValuedGraphElement<N, V>>;
  }

  /**
   * A mutable `EdgeValuedGraph` builder used to efficiently create new immutable instances.
   * See the [Graph documentation](https://rimbu.org/docs/collections/graph) and the [EdgeValuedGraph.Builder API documentation](https://rimbu.org/api/rimbu/graph/EdgeValuedGraph/Builder/interface)
   * @typeparam N - the node type
   * @typeparam V - the connection value type
   */
  export interface Builder<N, V>
    extends EdgeValuedGraphBase.Builder<N, V, EdgeValuedGraph.Types> {}

  /**
   * The EdgeValuedGraph's Context instance that serves as a factory for all related immutable instances and builders.
   * @typeparam UN - the upper type limit for node types for which this context can create instances
   */
  export interface Context<UN>
    extends EdgeValuedGraphBase.Context<UN, EdgeValuedGraph.Types> {}

  /**
   * Utility interface that provides higher-kinded types for this collection.
   */
  export interface Types extends EdgeValuedGraphBase.Types {
    readonly normal: EdgeValuedGraph<this['_N'], this['_V']>;
    readonly nonEmpty: EdgeValuedGraph.NonEmpty<this['_N'], this['_V']>;
    readonly context: EdgeValuedGraph.Context<this['_N']>;
    readonly builder: EdgeValuedGraph.Builder<this['_N'], this['_V']>;
  }
}

export const EdgeValuedGraph: EdgeValuedGraphCreators = Object.freeze({
  createContext<UN>(options: {
    linkMapContext: RMap.Context<UN>;
    linkConnectionsContext: RMap.Context<UN>;
  }): EdgeValuedGraph.Context<UN> {
    return Object.freeze(
      new ValuedGraphContext<UN, 'ArrowValuedGraph', any>(
        true,
        'ArrowValuedGraph',
        options.linkMapContext,
        options.linkConnectionsContext
      )
    );
  },
});