import { action, computed, observable, trace } from "mobx";
import { observer } from "mobx-react";
import { Doc, Opt } from "../../../fields/Doc";
import { Document } from "../../../fields/documentSchemas";
import { List } from "../../../fields/List";
import { listSpec } from "../../../fields/Schema";
import { ComputedField } from "../../../fields/ScriptField";
import { Cast, NumCast, StrCast } from "../../../fields/Types";
import { TraceMobx } from "../../../fields/util";
import { DashColor, numberRange } from "../../../Utils";
import { DocumentManager } from "../../util/DocumentManager";
import { SelectionManager } from "../../util/SelectionManager";
import { Transform } from "../../util/Transform";
import { CollectionFreeFormView } from "../collections/collectionFreeForm/CollectionFreeFormView";
import { DocComponent } from "../DocComponent";
import { InkingStroke } from "../InkingStroke";
import { StyleProp } from "../StyleProvider";
import "./CollectionFreeFormDocumentView.scss";
import { DocumentView, DocumentViewProps } from "./DocumentView";
import React = require("react");

export interface CollectionFreeFormDocumentViewProps extends DocumentViewProps {
    dataProvider?: (doc: Doc, replica: string) => { x: number, y: number, zIndex?: number, opacity?: number, highlight?: boolean, z: number, transition?: string } | undefined;
    sizeProvider?: (doc: Doc, replica: string) => { width: number, height: number } | undefined;
    layerProvider: ((doc: Doc, assign?: boolean) => boolean) | undefined;
    zIndex?: number;
    highlight?: boolean;
    jitterRotation: number;
    dataTransition?: string;
    replica: string;
    renderCutoff: () => number;
    renderIndex: number;
    CollectionFreeFormView: CollectionFreeFormView;
}

@observer
export class CollectionFreeFormDocumentView extends DocComponent<CollectionFreeFormDocumentViewProps, Document>(Document) {
    public static animFields = ["_height", "_width", "x", "y", "_scrollTop", "opacity"];  // fields that are configured to be animatable using animation frames
    @observable _animPos: number[] | undefined = undefined;
    @observable _contentView: DocumentView | undefined | null;
    get displayName() { return "CollectionFreeFormDocumentView(" + this.rootDoc.title + ")"; } // this makes mobx trace() statements more descriptive
    get maskCentering() { return this.props.Document.isInkMask ? InkingStroke.MaskDim / 2 : 0; }
    get transform() { return `translate(${this.X - this.maskCentering}px, ${this.Y - this.maskCentering}px) rotate(${this.props.jitterRotation}deg)`; }
    get X() { return this.dataProvider ? this.dataProvider.x : (this.Document.x || 0); }
    get Y() { return this.dataProvider ? this.dataProvider.y : (this.Document.y || 0); }
    get ZInd() { return this.dataProvider ? this.dataProvider.zIndex : (this.Document.zIndex || 0); }
    get Opacity() { return this.dataProvider ? this.dataProvider.opacity : undefined; }
    get Highlight() { return this.dataProvider?.highlight; }
    @computed get dataProvider() { return this.props.dataProvider?.(this.props.Document, this.props.replica); }
    @computed get sizeProvider() { return this.props.sizeProvider?.(this.props.Document, this.props.replica); }

    styleProvider = (doc: Doc | undefined, props: Opt<DocumentViewProps>, property: string) => {
        if (property === StyleProp.Opacity && doc === this.layoutDoc) return this.Opacity; // only change the opacity for this specific document, not its children
        return this.props.styleProvider?.(doc, props, property);
    }

    public static getValues(doc: Doc, time: number) {
        return CollectionFreeFormDocumentView.animFields.reduce((p, val) => {
            p[val] = Cast(`${val}-indexed`, listSpec("number"), [NumCast(doc[val])]).reduce((p, v, i) => (i <= Math.round(time) && v !== undefined) || p === undefined ? v : p, undefined as any as number);
            return p;
        }, {} as { [val: string]: Opt<number> });
    }

    public static setValues(time: number, d: Doc, vals: { [val: string]: Opt<number> }) {
        const timecode = Math.round(time);
        Object.keys(vals).forEach(val => {
            const findexed = Cast(d[`${val}-indexed`], listSpec("number"), []).slice();
            findexed[timecode] = vals[val] as any as number;
            d[`${val}-indexed`] = new List<number>(findexed);
        });
        d.appearFrame && (d["text-color"] =
            d.appearFrame === timecode + 1 ? "red" :
                d.appearFrame < timecode + 1 ? "grey" : "black");
    }

    public static updateKeyframe(docs: Doc[], time: number, targetDoc?: Doc) {
        const timecode = Math.round(time);
        docs.forEach(action(doc => {
            doc._viewTransition = doc.dataTransition = "all 1s";
            doc["text-color"] =
                !doc.appearFrame || !targetDoc ? "black" :
                    doc.appearFrame === timecode + 1 ? StrCast(targetDoc["pres-text-color"]) :
                        doc.appearFrame < timecode + 1 ? StrCast(targetDoc["pres-text-viewed-color"]) :
                            "black";
            CollectionFreeFormDocumentView.animFields.forEach(val => {
                const findexed = Cast(doc[`${val}-indexed`], listSpec("number"), null);
                findexed?.length <= timecode + 1 && findexed.push(undefined as any as number);
            });
        }));
        setTimeout(() => docs.forEach(doc => { doc._viewTransition = undefined; doc.dataTransition = "inherit"; }), 1010);
    }

    public static gotoKeyframe(docs: Doc[]) {
        docs.forEach(doc => doc._viewTransition = doc.dataTransition = "all 1s");
        setTimeout(() => docs.forEach(doc => { doc._viewTransition = undefined; doc.dataTransition = "inherit"; }), 1010);
    }

    public static setupZoom(doc: Doc, targDoc: Doc) {
        const width = new List<number>();
        const height = new List<number>();
        const top = new List<number>();
        const left = new List<number>();
        width.push(NumCast(targDoc._width));
        height.push(NumCast(targDoc._height));
        top.push(NumCast(targDoc._height) / -2);
        left.push(NumCast(targDoc._width) / -2);
        doc["viewfinder-width-indexed"] = width;
        doc["viewfinder-height-indexed"] = height;
        doc["viewfinder-top-indexed"] = top;
        doc["viewfinder-left-indexed"] = left;
    }

    public static setupKeyframes(docs: Doc[], currTimecode: number, makeAppear: boolean = false) {
        docs.forEach(doc => {
            if (doc.appearFrame === undefined) doc.appearFrame = currTimecode;
            if (!doc["opacity-indexed"]) { // opacity is unlike other fields because it's value should not be undefined before it appears to enable it to fade-in
                doc["opacity-indexed"] = new List<number>(numberRange(currTimecode + 1).map(t => !doc.z && makeAppear && t < NumCast(doc.appearFrame) ? 0 : 1));
            }
            CollectionFreeFormDocumentView.animFields.forEach(val => doc[val] = ComputedField.MakeInterpolated(val, "activeFrame", doc, currTimecode));
            doc.activeFrame = ComputedField.MakeFunction("self.context?._currentFrame||0");
            doc.dataTransition = "inherit";
        });
    }

    @action public float = () => {
        const { Document: topDoc, ContainingCollectionView: container } = this.props;
        const screenXf = container?.screenToLocalTransform();
        if (screenXf) {
            SelectionManager.DeselectAll();
            if (topDoc.z) {
                const spt = screenXf.inverse().transformPoint(NumCast(topDoc.x), NumCast(topDoc.y));
                topDoc.z = 0;
                topDoc.x = spt[0];
                topDoc.y = spt[1];
                this.props.removeDocument?.(topDoc);
                this.props.addDocTab(topDoc, "inParent");
            } else {
                const spt = this.screenToLocalTransform().inverse().transformPoint(0, 0);
                const fpt = screenXf.transformPoint(spt[0], spt[1]);
                topDoc.z = 1;
                topDoc.x = fpt[0];
                topDoc.y = fpt[1];
            }
            setTimeout(() => SelectionManager.SelectView(DocumentManager.Instance.getDocumentView(topDoc, container)!, false), 0);
        }
    }

    nudge = (x: number, y: number) => {
        this.props.Document.x = NumCast(this.props.Document.x) + x;
        this.props.Document.y = NumCast(this.props.Document.y) + y;
    }
    panelWidth = () => (this.sizeProvider?.width || this.props.PanelWidth?.());
    panelHeight = () => (this.sizeProvider?.height || this.props.PanelHeight?.());
    screenToLocalTransform = (): Transform => this.props.ScreenToLocalTransform().translate(-this.X, -this.Y);
    focusDoc = (doc: Doc) => this.props.focus(doc);
    returnThis = () => this;
    render() {
        TraceMobx();
        const divProps: DocumentViewProps = {
            ...this.props,
            CollectionFreeFormDocumentView: this.returnThis,
            styleProvider: this.styleProvider,
            layerProvider: this.props.layerProvider,
            ScreenToLocalTransform: this.screenToLocalTransform,
            PanelWidth: this.panelWidth,
            PanelHeight: this.panelHeight,
        };
        const background = this.props.styleProvider?.(this.rootDoc, this.props, StyleProp.BackgroundColor);
        const mixBlendMode = StrCast(this.layoutDoc.mixBlendMode) as any || (typeof background === "string" && DashColor(background).alpha() !== 1 ? "multiply" : undefined);
        return <div className={"collectionFreeFormDocumentView-container"}
            style={{
                outline: this.Highlight ? "orange solid 2px" : "",
                width: this.panelWidth(),
                height: this.panelHeight(),
                transform: this.transform,
                transition: this.props.dataTransition ? this.props.dataTransition : this.dataProvider ? this.dataProvider.transition : StrCast(this.layoutDoc.dataTransition),
                zIndex: this.ZInd,
                mixBlendMode,
                display: this.ZInd === -99 ? "none" : undefined
            }} >
            {this.props.renderCutoff() >= this.props.renderIndex ?
                <DocumentView {...divProps} ref={action((r: DocumentView | null) => this._contentView = r)} />
                :
                <div style={{ position: "absolute", width: this.panelWidth(), height: this.panelHeight(), background: "lightGreen" }}></div>}
        </div>;
    }
}