import React from "react";
import PropTypes, { InferType } from "prop-types";
import { State } from "../state";
import * as Interactions from "../interactions";
import { Graph } from "../structures/graph/graph";
import ForceGraph from "force-graph";
import { loadGraphJson } from "../../../datasets";
import { ToolPool } from "./toolpool";
import { ToolDetails } from "./tooldetails";
import { GraphRenderer } from "./graphrenderer";
import { SpaceSelect } from "./spaceselect";
import "./editor.css";

export class Editor extends React.PureComponent<
    InferType<typeof Editor.propTypes>,
    InferType<typeof Editor.stateTypes>
> {
    static propTypes = {};

    static stateTypes = {
        state: State,
        graph: Graph,
        renderer: PropTypes.any,
    };

    // TODO: Not a long term solution!
    public static globalState: State;
    public static globalGraph: Graph;
    public static globalRenderer: any;

    constructor(props: InferType<typeof Editor.propTypes>) {
        super(props);
        // Set as new state
        this.state = {
            state: undefined,
            graph: undefined,
            renderer: undefined,
        };

        Interactions.initInteractions();

        // Load initial space
        this.loadSpace("space");
    }

    /**
     * Loads a space from the database to the editor.
     * @param spaceId Id of space to load.
     * @returns Promise with boolean value that is true, if successful.
     */
    public loadSpace(spaceId: string): any {
        return loadGraphJson(spaceId).then(this.loadGraph);
    }

    /**
     * Loads another graph based on the data supplied. Note: Naming currently suggests that this only loads a GRAPH, not a SPACE. Needs further work and implementation to see if that makes sense or not.
     * @param data Serialized graph data.
     * @returns True, if successful.
     */
    public loadGraph(data: any): boolean {
        // Create global objects
        // TODO: is not loading properly
        Editor.globalState = new State();
        Editor.globalGraph = Graph.parse(data);

        // Is valid and parsed successfully?
        if (Editor.globalGraph == undefined) {
            Editor.globalState = this.state.state;
            Editor.globalGraph = this.state.graph;
            return false;
        }

        // Create renderer
        const renderTarget = document.getElementById("2d-graph");
        const renderWidth = renderTarget.offsetWidth;
        Editor.globalRenderer = ForceGraph()(renderTarget);

        // Subscribe to interactions
        Editor.globalRenderer
            .height(600)
            .width(renderWidth)
            .graphData(Editor.globalGraph.data)
            .nodeLabel("label")
            .linkColor((link: any) => Editor.globalState.linkColor(link))
            .nodeColor((node: any) => Editor.globalState.nodeColor(node))
            .onNodeClick((node: any) => Editor.globalState.onNodeClick(node))
            .onNodeDragEnd((node: any, translate: any) =>
                Editor.globalState.onNodeDragEnd(node, translate)
            )
            .autoPauseRedraw(false) // keep redrawing after engine has stopped
            .linkWidth((link: any) => Editor.globalState.linkWidth(link))
            .linkDirectionalParticles(
                Editor.globalState.linkDirectionalParticles()
            )
            .linkDirectionalParticleWidth((link: any) =>
                Editor.globalState.linkDirectionalParticleWidth(link)
            )
            .onBackgroundClick((event: any) =>
                Editor.globalState.onBackgroundClick(
                    event,
                    this.extractPositions(event)
                )
            )
            .nodeCanvasObjectMode((node: any) =>
                Editor.globalState.nodeCanvasObjectMode(node)
            )
            .nodeCanvasObject((node: any, ctx: any, globalScale: any) =>
                Editor.globalState.nodeCanvasObject(node, ctx, globalScale)
            )
            .linkCanvasObjectMode((link: any) =>
                Editor.globalState.linkCanvasObjectMode(link)
            )
            .linkCanvasObject((link: any, ctx: any, globalScale: any) =>
                Editor.globalState.linkCanvasObject(link, ctx, globalScale)
            )
            .onLinkClick((link: any) => Editor.globalState.onLinkClick(link));

        // Connect update event
        Editor.globalGraph.onChangeCallbacks.push((data) => {
            Editor.globalRenderer.graphData(data);
        });

        // Set as new state
        this.setState({
            state: Editor.globalState,
            graph: Editor.globalGraph,
            renderer: Editor.globalRenderer,
        });

        // Subscribe to global key-press events
        document.onkeydown = this.state.state.onKeyDown;
        document.onkeyup = this.state.state.onKeyUp;

        return true;
    }

    /**
     * Calculates the corresponding coordinates for a click event for easier further processing.
     * @param event The corresponding click event.
     * @returns Coordinates in graph and coordinates in browser window.
     */
    private extractPositions(event: any): {
        graph: { x: number; y: number };
        window: { x: number; y: number };
    } {
        return {
            graph: this.state.renderer.screen2GraphCoords(
                event.layerX,
                event.layerY
            ),
            window: { x: event.clientX, y: event.clientY },
        };
    }

    render(): React.ReactNode {
        // The id "ks-editor" indicates, that the javascript associated with this should automatically be executed
        return (
            <div id="ks-editor">
                <h1>Interface</h1>
                <div id="content">
                    <div id="sidepanel">
                        <SpaceSelect />
                        <hr />
                        <ToolPool state={this.state.state} />
                        <hr />
                        <ToolDetails />
                    </div>
                    <GraphRenderer />
                </div>
            </div>
        );
    }
}