import { action, computed, observable, trace } from 'mobx';
import { observer } from 'mobx-react';
import { Doc, Opt } from '../../../fields/Doc';
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 { numberRange, OmitKeys } from '../../../Utils';
import { DocumentManager } from '../../util/DocumentManager';
import { SelectionManager } from '../../util/SelectionManager';
import { CollectionFreeFormView } from '../collections/collectionFreeForm/CollectionFreeFormView';
import { DocComponent } from '../DocComponent';
import { StyleProp } from '../StyleProvider';
import './CollectionFreeFormDocumentView.scss';
import { DocumentView, DocumentViewProps, OpenWhere } from './DocumentView';
import React = require('react');

export interface CollectionFreeFormDocumentViewWrapperProps extends DocumentViewProps {
    x: number;
    y: number;
    z: number;
    width: number;
    height: number;
    zIndex?: number;
    rotation?: number;
    color?: string;
    backgroundColor?: string;
    opacity?: number;
    highlight?: boolean;
    transition?: string;
    dataTransition?: string;
    RenderCutoffProvider: (doc: Doc) => boolean;
    CollectionFreeFormView: CollectionFreeFormView;
}
@observer
export class CollectionFreeFormDocumentViewWrapper extends DocComponent<CollectionFreeFormDocumentViewWrapperProps>() implements CollectionFreeFormDocumentViewProps {
    @observable X = this.props.x;
    @observable Y = this.props.y;
    @observable Z = this.props.z;
    @observable ZIndex = this.props.zIndex;
    @observable Rotation = this.props.rotation;
    @observable Opacity = this.props.opacity;
    @observable BackgroundColor = this.props.backgroundColor;
    @observable Color = this.props.color;
    @observable Highlight = this.props.highlight;
    @observable Width = this.props.width;
    @observable Height = this.props.height;
    @observable Transition = this.props.transition;
    @observable DataTransition = this.props.dataTransition;
    CollectionFreeFormView = this.props.CollectionFreeFormView; // needed for type checking
    RenderCutoffProvider = this.props.RenderCutoffProvider; // needed for type checking

    @computed get WrapperKeys() {
        return Object.keys(this).filter(key => key.startsWith('w_')).map(key => key.replace('w_', ''))
                  .map(key => ({upper:key, lower:key[0].toLowerCase() + key.substring(1)})); // prettier-ignore
    }

    // wrapper functions around prop fields that have been converted to observables to keep 'props' from ever changing.
    // this way, downstream code only invalidates when it uses a specific prop, not when any prop changes
    w_X = ()               => this.X; // prettier-ignore
    w_Y = ()               => this.Y; // prettier-ignore
    w_Z = ()               => this.Z; // prettier-ignore
    w_ZIndex = ()          => this.ZIndex ?? NumCast(this.props.Document.zIndex); // prettier-ignore
    w_Rotation = ()        => this.Rotation ?? NumCast(this.props.Document._rotation); // prettier-ignore
    w_Opacity = ()         => this.Opacity; // prettier-ignore
    w_BackgroundColor = () => this.BackgroundColor ?? Cast(this.props.Document._backgroundColor, 'string', null); // prettier-ignore
    w_Color = ()           => this.Color ?? Cast(this.props.Document._color, 'string', null); // prettier-ignore
    w_Highlight = ()       => this.Highlight; // prettier-ignore
    w_Width = ()           => this.Width; // prettier-ignore
    w_Height = ()          => this.Height; // prettier-ignore
    w_Transition = ()      => this.Transition; // prettier-ignore
    w_DataTransition = ()  => this.DataTransition; // prettier-ignore

    PanelWidth = ()        => this.Width || this.props.PanelWidth?.(); // prettier-ignore
    PanelHeight = ()       => this.Height || this.props.PanelHeight?.(); // prettier-ignore
    @action
    componentDidUpdate() {
        this.WrapperKeys.forEach(keys => ((this as any)[keys.upper] = (this.props as any)[keys.lower]));
    }
    render() {
        const layoutProps = this.WrapperKeys.reduce((val, keys) => [(val['w_' + keys.upper] = (this as any)['w_' + keys.upper]), val][1], {} as { [key: string]: Function });
        return (
            <CollectionFreeFormDocumentView
                {...OmitKeys(this.props, this.WrapperKeys.map(keys => keys.lower) ).omit} // prettier-ignore
                {...layoutProps}
                PanelWidth={this.PanelWidth}
                PanelHeight={this.PanelHeight}
            />
        );
    }
}
export interface CollectionFreeFormDocumentViewProps {
    w_X: () => number;
    w_Y: () => number;
    w_Z: () => number;
    w_ZIndex?: () => number;
    w_Rotation?: () => number;
    w_Color: () => string;
    w_BackgroundColor: () => string;
    w_Opacity: () => number | undefined;
    w_Highlight: () => boolean | undefined;
    w_Transition: () => string | undefined;
    w_Width: () => number;
    w_Height: () => number;
    w_DataTransition: () => string | undefined;
    PanelWidth: () => number;
    PanelHeight: () => number;
    RenderCutoffProvider: (doc: Doc) => boolean;
    CollectionFreeFormView: CollectionFreeFormView;
}

@observer
export class CollectionFreeFormDocumentView extends DocComponent<CollectionFreeFormDocumentViewProps & DocumentViewProps>() {
    get displayName() { // this makes mobx trace() statements more descriptive
        return 'CollectionFreeFormDocumentView(' + this.rootDoc.title + ')';
    } // prettier-ignore
    public static animFields: { key: string; val?: number }[] = [
        { key: 'x' },
        { key: 'y' },
        { key: 'opacity', val: 1 },
        { key: '_height' },
        { key: '_width' },
        { key: '_rotation', val: 0 },
        { key: '_layout_scrollTop' },
        { key: '_currentFrame' },
        { key: 'freeform_scale', val: 1 },
        { key: 'freeform_panX' },
        { key: 'freeform_panY' },
    ]; // fields that are configured to be animatable using animation frames
    public static animStringFields = ['backgroundColor', 'color', 'fillColor']; // fields that are configured to be animatable using animation frames
    public static animDataFields = (doc: Doc) => (Doc.LayoutFieldKey(doc) ? [Doc.LayoutFieldKey(doc)] : []); // fields that are configured to be animatable using animation frames

    @observable _animPos: number[] | undefined = undefined;
    @observable _contentView: DocumentView | undefined | null;

    get CollectionFreeFormView() {
        return this.props.CollectionFreeFormView;
    }

    styleProvider = (doc: Doc | undefined, props: Opt<DocumentViewProps>, property: string) => {
        if (doc === this.layoutDoc) {
            switch (property) {
                case StyleProp.Opacity:         return this.props.w_Opacity(); // only change the opacity for this specific document, not its children
                case StyleProp.BackgroundColor: return this.props.w_BackgroundColor();
                case StyleProp.Color:           return this.props.w_Color();
            } // prettier-ignore
        }
        return this.props.styleProvider?.(doc, props, property);
    };

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

    public static setStringValues(time: number, d: Doc, vals: { [val: string]: Opt<string> }) {
        const timecode = Math.round(time);
        Object.keys(vals).forEach(val => {
            const findexed = Cast(d[`${val}-indexed`], listSpec('string'), []).slice();
            findexed[timecode] = vals[val] as any as string;
            d[`${val}-indexed`] = new List<string>(findexed);
        });
    }

    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);
        });
    }

    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.key] = ComputedField.MakeInterpolatedNumber(val.key, 'activeFrame', doc, currTimecode, val.val)));
            CollectionFreeFormDocumentView.animStringFields.forEach(val => (doc[val] = ComputedField.MakeInterpolatedString(val, 'activeFrame', doc, currTimecode)));
            CollectionFreeFormDocumentView.animDataFields(doc).forEach(val => (doc[val] = ComputedField.MakeInterpolatedDataField(val, 'activeFrame', doc, currTimecode)));
            const targetDoc = doc; // data fields, like rtf 'text' exist on the data doc, so
            //doc !== targetDoc && (targetDoc.embedContainer = doc.embedContainer); // the computed fields don't see the layout doc -- need to copy the embedContainer to the data doc (HACK!!!) and set the activeFrame on the data doc (HACK!!!)
            targetDoc.activeFrame = ComputedField.MakeFunction('self.embedContainer?._currentFrame||0');
            targetDoc.dataTransition = 'inherit';
        });
    }

    @action public float = () => {
        const topDoc = this.rootDoc;
        const containerDocView = this.props.docViewPath().lastElement();
        const screenXf = containerDocView?.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, OpenWhere.inParentFromScreen);
            } 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, containerDocView), false), 0);
        }
    };

    nudge = (x: number, y: number) => {
        this.props.Document.x = this.props.w_X() + x;
        this.props.Document.y = this.props.w_Y() + y;
    };
    screenToLocalTransform = () => this.props.ScreenToLocalTransform().translate(-this.props.w_X(), -this.props.w_Y());
    returnThis = () => this;

    /// this indicates whether the doc view is activated because of its relationshop to a group
    //  'group' - this is a group that is activated because it's on an active canvas, but is not part of some other group
    //  'child' - this is a group child that is activated because its containing group is activated
    //  'inactive' - this is a group child but it is not active
    //  undefined - this is not activated by a group
    isGroupActive = () => {
        if (this.CollectionFreeFormView.isAnyChildContentActive()) return undefined;
        const isGroup = this.rootDoc._isGroup && (!this.rootDoc.backgroundColor || this.rootDoc.backgroundColor === 'transparent');
        return isGroup ? (this.props.isDocumentActive?.() ? 'group' : this.props.isGroupActive?.() ? 'child' : 'inactive') : this.props.isGroupActive?.() ? 'child' : undefined;
    };
    render() {
        TraceMobx();
        const passOnProps = OmitKeys(this.props, Object.keys(this.props).filter(key => key.startsWith('w_'))).omit; // prettier-ignore
        return (
            <div
                className="collectionFreeFormDocumentView-container"
                style={{
                    width: this.props.PanelWidth(),
                    height: this.props.PanelHeight(),
                    transform: `translate(${this.props.w_X()}px, ${this.props.w_Y()}px) rotate(${NumCast(this.props.w_Rotation?.())}deg)`,
                    transition: this.props.w_Transition?.() ?? (this.props.w_DataTransition?.() || this.props.w_Transition?.()),
                    zIndex: this.props.w_ZIndex?.(),
                    display: this.props.w_Width?.() ? undefined : 'none',
                }}>
                {this.props.RenderCutoffProvider(this.props.Document) ? (
                    <div style={{ position: 'absolute', width: this.props.PanelWidth(), height: this.props.PanelHeight(), background: 'lightGreen' }} />
                ) : (
                    <DocumentView
                        ref={action((r: DocumentView | null) => (this._contentView = r))}
                        {...passOnProps}
                        CollectionFreeFormDocumentView={this.returnThis}
                        styleProvider={this.styleProvider}
                        ScreenToLocalTransform={this.screenToLocalTransform}
                        isGroupActive={this.isGroupActive}
                    />
                )}
            </div>
        );
    }
}
