import * as React from "react";
import { observer } from "mobx-react";
import { observable, reaction, action, IReactionDisposer, observe, IObservableArray, computed, toJS, IObservableObject, runInAction } from "mobx";
import "./Track.scss";
import { Doc, DocListCastAsync, DocListCast } from "../../../new_fields/Doc";
import {listSpec} from "../../../new_fields/Schema";
import { FieldValue, Cast, NumCast, BoolCast, StrCast } from "../../../new_fields/Types";
import { List } from "../../../new_fields/List";
import { Keyframe, KeyframeFunc, RegionData } from "./Keyframe";
import { FlyoutProps } from "./Timeline";
import { Transform } from "../../util/Transform";
import { AddComparisonParameters } from "../../northstar/model/idea/idea";

interface IProps {
    node: Doc;
    currentBarX: number;
    transform: Transform; 
    changeCurrentBarX: (x:number) => void;
    setFlyout: (props:FlyoutProps) => any; 
}

@observer
export class Track extends React.Component<IProps> {
    @observable private _inner = React.createRef<HTMLDivElement>();   
    @observable private _reactionDisposers: IReactionDisposer[] = [];
    @observable private _keyReaction:any; //reaction that is used to dispose when necessary 
    @observable private _currentBarXReaction:any; 

    @computed
    private get regions() {
        return Cast(this.props.node.regions, listSpec(Doc)) as List<Doc>;
    }

    componentWillMount() {
        if (!this.props.node.regions){
            this.props.node.regions = new List<Doc>();
        }
        this.props.node.opacity = 1;         
    }

    componentDidMount() {
        runInAction(() => {
            this.createRegion(this.props.currentBarX); 
            this.props.node.hidden = false;  
            this._currentBarXReaction = this.currentBarXReaction(); 
        }); 
    }

    componentWillUnmount() {
       runInAction(() => {
           if (this._keyReaction) this._keyReaction(); 
           if (this._currentBarXReaction) this._currentBarXReaction(); 
       }); 
    }

    @action 
    keyReaction = () => {
        return reaction(() => {
            let keys = Doc.allKeys(this.props.node); 
            return keys.map(key => FieldValue(this.props.node[key]));     
        }, data => {
            console.log("full reaction"); 
            let regiondata = this.findRegion(this.props.currentBarX);
            if (regiondata){
                DocListCast(regiondata.keyframes!).forEach((kf) => {
                    if (kf.type === KeyframeFunc.KeyframeType.default){
                        kf.key = Doc.MakeCopy(this.props.node, true); 
                        let leftkf: (Doc | undefined) = this.calcMinLeft(regiondata!, kf); // lef keyframe, if it exists
                        let rightkf: (Doc | undefined) = this.calcMinRight(regiondata!, kf); //right keyframe, if it exists
                        if (leftkf!.type === KeyframeFunc.KeyframeType.fade){ //replicating this keyframe to fades
                            let edge = this.calcMinLeft(regiondata!, leftkf!); 
                            edge!.key = Doc.MakeCopy(kf.key as Doc, true); 
                            leftkf!.key = Doc.MakeCopy(kf.key as Doc, true) ; 
                            (Cast(edge!.key, Doc)! as Doc).opacity = 0.1; 
                            (Cast(leftkf!.key, Doc)! as Doc).opacity = 1; 
                        } 
                        if (rightkf!.type === KeyframeFunc.KeyframeType.fade){
                            let edge = this.calcMinRight(regiondata!, rightkf!);  
                            edge!.key = Doc.MakeCopy(kf.key as Doc, true); 
                            rightkf!.key = Doc.MakeCopy(kf.key as Doc, true); 
                            (Cast(edge!.key, Doc)! as Doc).opacity = 0.1; 
                            (Cast(rightkf!.key, Doc)! as Doc).opacity = 1; 
                        }
                    } 
                }); 
            }
        }); 
    }

    @action 
    currentBarXReaction = () => {
        return reaction(() => this.props.currentBarX, () => {            
            console.log("currentbar changed"); 
            if (this._keyReaction) this._keyReaction(); //dispose previous reaction first
            let regiondata: (Doc | undefined) = this.findRegion(this.props.currentBarX);
            if (regiondata) {                  
                this.props.node.hidden = false;                 
                this.timeChange(this.props.currentBarX);                        
                DocListCast(regiondata.keyframes).forEach((kf) => {
                    if (kf.time === this.props.currentBarX && kf.type === KeyframeFunc.KeyframeType.default){
                        console.log("HI!"); 
                        this._keyReaction = this.keyReaction(); //reactivates reaction. 
                    }
                });                 
            } else {
                this.props.node.hidden = true;
            }
        });
    }


    @action
    timeChange = (time: number) => {
        let regiondata = this.findRegion(Math.round(time)); //finds a region that the scrubber is on
        if (regiondata) {
            let leftkf: (Doc | undefined) = this.calcMinLeft(regiondata!); // lef keyframe, if it exists
            let rightkf: (Doc | undefined) = this.calcMinRight(regiondata!); //right keyframe, if it exists
            if(leftkf && rightkf) {
                this.interpolate(leftkf, rightkf);
            }            
            let currentkf: (Doc | undefined) = this.calcCurrent(regiondata!); //if the scrubber is on top of the keyframe

            if (currentkf){
                console.log(toJS(currentkf)); 
                this.applyKeys(Cast(currentkf.key, Doc) as Doc);  
            } 
        }
       
    }

    @action 
    private applyKeys = (kf: Doc) => {
        this.filterKeys(Doc.allKeys(kf)).forEach(key => {
            if (key === "title" || key === "documentText") Doc.SetOnPrototype(this.props.node, key, StrCast(kf[key]));
            this.props.node[key] = kf[key]; 
        }); 
    }


    @action 
    private filterKeys = (keys:string[]):string[] => {
        return keys.reduce((acc:string[], key:string) => {
            if ( key !== "regions" && key !== "data" && key !== "creationDate" && key !== "cursors" && key !== "hidden") acc.push(key); 
            return acc; 
        }, []) as string[];
    }

    @action 
    calcCurrent = (region:Doc):(Doc|undefined) => {
        let currentkf:(Doc|undefined) = undefined; 
        DocListCast(region.keyframes!).forEach((kf) => {
            if (NumCast(kf.time) === Math.round(this.props.currentBarX)) currentkf = kf; 
        }); 
        return currentkf; 
    }


    @action
    calcMinLeft = (region: Doc, ref?:Doc): (Doc | undefined) => { //returns the time of the closet keyframe to the left
        let leftKf:(Doc| undefined) = undefined;
        let time:number = 0; 
        DocListCast(region.keyframes!).forEach((kf) => {
            let compTime = this.props.currentBarX; 
            if (ref){
                compTime = NumCast(ref.time); 
            } 
            if (NumCast(kf.time) < compTime && NumCast(kf.time) >= time) {
                leftKf = kf;
                time = NumCast(kf.time); 
            }
        });
        return leftKf;
    }


    @action
    calcMinRight = (region: Doc, ref?:Doc): (Doc | undefined) => { //returns the time of the closest keyframe to the right 
        let rightKf: (Doc|undefined) = undefined;
        let time:number = Infinity; 
        DocListCast(region.keyframes!).forEach((kf) => {
            let compTime = this.props.currentBarX; 
            if (ref){
                compTime = NumCast(ref.time); 
            }
            if (NumCast(kf.time) > compTime && NumCast(kf.time) <= NumCast(time)) {
                rightKf = kf;
                time = NumCast(kf.time); 
            }
        });
        return rightKf;
    }

    @action
    interpolate = (left: Doc, right: Doc) => {
        console.log("interpolating"); 
        let leftNode = left.key as Doc;
        let rightNode = right.key as Doc;

        console.log(toJS(leftNode)); 
        console.log(toJS(rightNode)); 

        const dif_time = NumCast(right.time) - NumCast(left.time);
        const ratio = (this.props.currentBarX - NumCast(left.time)) / dif_time; //linear 


        this.filterKeys(Doc.allKeys(leftNode)).forEach(key => {
            console.log(key); 
            if (leftNode[key] && rightNode[key] && typeof(leftNode[key]) === "number" && typeof(rightNode[key]) === "number"){ //if it is number, interpolate
                const diff = NumCast(rightNode[key]) - NumCast(leftNode[key]);
                const adjusted = diff * ratio;
                this.props.node[key] = NumCast(leftNode[key]) + adjusted;
            } else if (key === "title" || key === "documentText") {
                Doc.SetOnPrototype(this.props.node, key, StrCast(leftNode[key]));
                this.props.node[key] = leftNode[key]; 
            }
            console.log(this.props.node[key]); 
        });
        console.log("done"); 
    }

    @action
    findRegion(time: number): (Doc | undefined) {
        let foundRegion = undefined;
        this.regions.map(region => {
            region = region as Doc; 
            if (time >= NumCast(region.position) && time <= (NumCast(region.position) + NumCast(region.duration))) {
                foundRegion = region;
            }
        });
        return foundRegion;
    }

    @action
    onInnerDoubleClick = (e: React.MouseEvent) => {
        let inner = this._inner.current!;
        let offsetX = Math.round((e.clientX - inner.getBoundingClientRect().left) * this.props.transform.Scale);
        this.createRegion(offsetX); 
    }

    createRegion = (position: number) => {
        let regiondata = KeyframeFunc.defaultKeyframe();
        regiondata.position = position; 
        let leftRegion = KeyframeFunc.findAdjacentRegion(KeyframeFunc.Direction.left, regiondata, this.regions); 
        let rightRegion = KeyframeFunc.findAdjacentRegion(KeyframeFunc.Direction.right, regiondata, this.regions); 
        if ((rightRegion && leftRegion && rightRegion.position - (leftRegion.position + leftRegion.duration) < NumCast(regiondata.fadeIn) + NumCast(regiondata.fadeOut)) || (rightRegion && rightRegion.position - regiondata.position < NumCast(regiondata.fadeIn) + NumCast(regiondata.fadeOut))){
            return; 
        } else if (rightRegion && rightRegion.position - regiondata.position >= NumCast(regiondata.fadeIn) + NumCast(regiondata.fadeOut)){
            regiondata.duration = rightRegion.position - regiondata.position; 
        }
        this.regions.push(regiondata);
        return regiondata; 
    }


    render() {
        return (
            <div className="track-container">
                <div className="track">
                    <div className="inner" ref={this._inner} onDoubleClick={this.onInnerDoubleClick}>
                        {DocListCast(this.regions).map((region) => {
                            return <Keyframe node={this.props.node} RegionData={region} changeCurrentBarX={this.props.changeCurrentBarX} setFlyout={this.props.setFlyout} transform={this.props.transform}/>;
                        })}
                    </div>
                </div>
            </div>
        );
    }
}