import Translations from "../../UI/i18n/Translations";
import TagRenderingConfig from "./TagRenderingConfig";
import {Tag, TagsFilter} from "../../Logic/Tags";
import {LayerConfigJson} from "./LayerConfigJson";
import {FromJSON} from "./FromJSON";
import SharedTagRenderings from "../SharedTagRenderings";
import {TagRenderingConfigJson} from "./TagRenderingConfigJson";
import {Translation} from "../../UI/i18n/Translation";
import Img from "../../UI/Base/Img";
import Svg from "../../Svg";
import {Utils} from "../../Utils";
import Combine from "../../UI/Base/Combine";
import {VariableUiElement} from "../../UI/Base/VariableUIElement";
import {UIEventSource} from "../../Logic/UIEventSource";
import {FixedUiElement} from "../../UI/Base/FixedUiElement";
import {UIElement} from "../../UI/UIElement";
import {SubstitutedTranslation} from "../../UI/SubstitutedTranslation";
import SourceConfig from "./SourceConfig";

export default class LayerConfig {


    static WAYHANDLING_DEFAULT = 0;
    static WAYHANDLING_CENTER_ONLY = 1;
    static WAYHANDLING_CENTER_AND_WAY = 2;
    id: string;
    name: Translation
    description: Translation;
    source: SourceConfig;
    doNotDownload: boolean;
    passAllFeatures: boolean;
    minzoom: number;
    maxzoom: number;
    title?: TagRenderingConfig;
    titleIcons: TagRenderingConfig[];
    icon: TagRenderingConfig;
    iconOverlays: { if: TagsFilter, then: TagRenderingConfig, badge: boolean }[]
    iconSize: TagRenderingConfig;
    rotation: TagRenderingConfig;
    color: TagRenderingConfig;
    width: TagRenderingConfig;
    dashArray: TagRenderingConfig;
    wayHandling: number;
    hideUnderlayingFeaturesMinPercentage?: number;

    presets: {
        title: Translation,
        tags: Tag[],
        description?: Translation,
    }[];

    tagRenderings: TagRenderingConfig [];
    
    constructor(json: LayerConfigJson,
                context?: string) {
        context = context + "." + json.id;
        const self = this;
        this.id = json.id;
        this.name = Translations.T(json.name, context + ".name");
        this.description = Translations.T(json.description, context + ".description");

        let legacy = undefined;
        if (json["overpassTags"] !== undefined) {
            // @ts-ignore
            legacy = FromJSON.Tag(json["overpassTags"], context + ".overpasstags");
        }
        if(json.source !== undefined){
            if (legacy !== undefined ) {
                throw context+"Both the legacy 'layer.overpasstags' and the new 'layer.source'-field are defined"
            }

            let osmTags: TagsFilter = legacy;
            if (json.source["osmTags"]) {
                osmTags = FromJSON.Tag(json.source["osmTags"], context + "source.osmTags");
            }


            this.source = new SourceConfig({
                osmTags: osmTags,
                geojsonSource: json.source["geoJsonSource"],
                overpassScript: json.source["overpassScript"],
            });
        }else{
            this.source = new SourceConfig({
                osmTags : legacy
            })
        }
        
      


        this.doNotDownload = json.doNotDownload ?? false;
        this.passAllFeatures = json.passAllFeatures ?? false;
        this.minzoom = json.minzoom ?? 0;
        this.maxzoom = json.maxzoom ?? 1000;
        this.wayHandling = json.wayHandling ?? 0;
        this.hideUnderlayingFeaturesMinPercentage = json.hideUnderlayingFeaturesMinPercentage ?? 0;
        this.presets = (json.presets ?? []).map((pr, i) =>
            ({
                title: Translations.T(pr.title, `${context}.presets[${i}].title`),
                tags: pr.tags.map(t => FromJSON.SimpleTag(t)),
                description: Translations.T(pr.description, `${context}.presets[${i}].description`)
            }))


        /** Given a key, gets the corresponding property from the json (or the default if not found
         *
         * The found value is interpreted as a tagrendering and fetched/parsed
         * */
        function tr(key: string, deflt) {
            const v = json[key];
            if (v === undefined || v === null) {
                if (deflt === undefined) {
                    return undefined;
                }
                return new TagRenderingConfig(deflt, self.source.osmTags, `${context}.${key}.default value`);
            }
            if (typeof v === "string") {
                const shared = SharedTagRenderings.SharedTagRendering[v];
                if (shared) {
                    return shared;
                }
            }
            return new TagRenderingConfig(v, self.source.osmTags, `${context}.${key}`);
        }

        /**
         * Converts a list of tagRenderingCOnfigJSON in to TagRenderingConfig
         * A string is interpreted as a name to call
         */
        function trs(tagRenderings?: (string | TagRenderingConfigJson)[], readOnly = false) {
            if (tagRenderings === undefined) {
                return [];
            }

            return tagRenderings.map(
                (renderingJson, i) => {
                    if (typeof renderingJson === "string") {

                        if (renderingJson === "questions") {
                            if(readOnly){
                                throw `A tagrendering has a question, but asking a question does not make sense here: is it a title icon or a geojson-layer? ${context}`
                            }
                            
                            return new TagRenderingConfig("questions", undefined)
                        }


                        const shared = SharedTagRenderings.SharedTagRendering[renderingJson];
                        if (shared !== undefined) {
                            return shared;
                        }
                        throw `Predefined tagRendering ${renderingJson} not found in ${context}`;
                    }
                    return new TagRenderingConfig(renderingJson, self.source.osmTags, `${context}.tagrendering[${i}]`);
                });
        }

        this.tagRenderings = trs(json.tagRenderings, this.source.geojsonSource !== undefined);


        const titleIcons = [];
        const defaultIcons = ["phonelink", "emaillink", "wikipedialink", "osmlink", "sharelink"];
        for (const icon of (json.titleIcons ?? defaultIcons)) {
            if (icon === "defaults") {
                titleIcons.push(...defaultIcons);
            } else {
                titleIcons.push(icon);
            }
        }

        this.titleIcons = trs(titleIcons, true);


        this.title = tr("title", undefined);
        this.icon = tr("icon", Img.AsData(Svg.pin));
        this.iconOverlays = (json.iconOverlays ?? []).map((overlay, i) => {
            let tr = new TagRenderingConfig(overlay.then, self.source.osmTags, `iconoverlays.${i}`);
            if (typeof overlay.then === "string" && SharedTagRenderings.SharedIcons[overlay.then] !== undefined) {
                tr = SharedTagRenderings.SharedIcons[overlay.then];
            }
            return {
                if: FromJSON.Tag(overlay.if),
                then: tr,
                badge: overlay.badge ?? false
            }
        });

        const iconPath = this.icon.GetRenderValue({id: "node/-1"}).txt;
        if (iconPath.startsWith(Utils.assets_path)) {
            const iconKey = iconPath.substr(Utils.assets_path.length);
            if (Svg.All[iconKey] === undefined) {
                throw "Builtin SVG asset not found: " + iconPath
            }
        }
        this.iconSize = tr("iconSize", "40,40,center");
        this.color = tr("color", "#0000ff");
        this.width = tr("width", "7");
        this.rotation = tr("rotation", "0");
        this.dashArray = tr("dashArray", "");


    }


    public AddRoamingRenderings(addAll: {
        tagRenderings: TagRenderingConfig[],
        titleIcons: TagRenderingConfig[],
        iconOverlays: { "if": TagsFilter, then: TagRenderingConfig, badge: boolean }[]

    }): LayerConfig {

        let insertionPoint = this.tagRenderings.map(tr => tr.IsQuestionBoxElement()).indexOf(true)
        if (insertionPoint < 0) {
            // No 'questions' defined - we just add them all to the end
            insertionPoint = this.tagRenderings.length;
        }
        this.tagRenderings.splice(insertionPoint, 0, ...addAll.tagRenderings);


        this.iconOverlays.push(...addAll.iconOverlays);
        for (const icon of addAll.titleIcons) {
            this.titleIcons.splice(0, 0, icon);
        }
        return this;
    }

    public GetRoamingRenderings(): {
        tagRenderings: TagRenderingConfig[],
        titleIcons: TagRenderingConfig[],
        iconOverlays: { "if": TagsFilter, then: TagRenderingConfig, badge: boolean }[]

    } {

        const tagRenderings = this.tagRenderings.filter(tr => tr.roaming);
        const titleIcons = this.titleIcons.filter(tr => tr.roaming);
        const iconOverlays = this.iconOverlays.filter(io => io.then.roaming)

        return {
            tagRenderings: tagRenderings,
            titleIcons: titleIcons,
            iconOverlays: iconOverlays
        }

    }

    public GenerateLeafletStyle(tags: UIEventSource<any>, clickable: boolean):
        {
            icon:
                {
                    html: UIElement,
                    iconSize: [number, number],
                    iconAnchor: [number, number],
                    popupAnchor: [number, number],
                    iconUrl: string,
                    className: string
                },
            color: string,
            weight: number,
            dashArray: number[]
        } {

        function num(str, deflt = 40) {
            const n = Number(str);
            if (isNaN(n)) {
                return deflt;
            }
            return n;
        }

        function rendernum(tr: TagRenderingConfig, deflt: number) {
            const str = Number(render(tr, "" + deflt));
            const n = Number(str);
            if (isNaN(n)) {
                return deflt;
            }
            return n;
        }

        function render(tr: TagRenderingConfig, deflt?: string) {
            const str = (tr?.GetRenderValue(tags.data)?.txt ?? deflt);
            return SubstitutedTranslation.SubstituteKeys(str, tags.data);
        }

        const iconSize = render(this.iconSize, "40,40,center").split(",");
        const dashArray = render(this.dashArray).split(" ").map(Number);
        let color = render(this.color, "#00f");

        if (color.startsWith("--")) {
            color = getComputedStyle(document.body).getPropertyValue("--catch-detail-color")
        }

        const weight = rendernum(this.width, 5);

        const iconW = num(iconSize[0]);
        const iconH = num(iconSize[1]);
        const mode = iconSize[2] ?? "center"

        let anchorW = iconW / 2;
        let anchorH = iconH / 2;
        if (mode === "left") {
            anchorW = 0;
        }
        if (mode === "right") {
            anchorW = iconW;
        }

        if (mode === "top") {
            anchorH = 0;
        }
        if (mode === "bottom") {
            anchorH = iconH;
        }

        const iconUrlStatic = render(this.icon);
        const self = this;
        const mappedHtml = tags.map(tgs => {
            // What do you mean, 'tgs' is never read?
            // It is read implicitly in the 'render' method
            const iconUrl = render(self.icon);
            const rotation = render(self.rotation, "0deg");

            let htmlParts: UIElement[] = [];
            let sourceParts = iconUrl.split(";");

            function genHtmlFromString(sourcePart: string): UIElement {
                const style = `width:100%;height:100%;transform: rotate( ${rotation} );display:block;position: absolute; top: 0; left: 0`;
                let html: UIElement = new FixedUiElement(`<img src="${sourcePart}" style="${style}" />`);
                const match = sourcePart.match(/([a-zA-Z0-9_]*):([^;]*)/)
                if (match !== null && Svg.All[match[1] + ".svg"] !== undefined) {
                    html = new Combine([
                        (Svg.All[match[1] + ".svg"] as string)
                            .replace(/#000000/g, match[2])
                    ]).SetStyle(style);
                }
                return html;
            }


            for (const sourcePart of sourceParts) {
                htmlParts.push(genHtmlFromString(sourcePart))
            }


            let badges = [];
            for (const iconOverlay of self.iconOverlays) {
                if (!iconOverlay.if.matchesProperties(tgs)) {
                    continue;
                }
                if (iconOverlay.badge) {
                    const badgeParts: UIElement[] = [];
                    const partDefs = iconOverlay.then.GetRenderValue(tgs).txt.split(";");

                    for (const badgePartStr of partDefs) {
                        badgeParts.push(genHtmlFromString(badgePartStr))
                    }

                    const badgeCompound = new Combine(badgeParts)
                        .SetStyle("display:flex;position:relative;width:100%;height:100%;");

                    badges.push(badgeCompound)

                } else {
                    htmlParts.push(genHtmlFromString(
                        iconOverlay.then.GetRenderValue(tgs).txt));
                }
            }

            if (badges.length > 0) {
                const badgesComponent = new Combine(badges)
                    .SetStyle("display:flex;height:50%;width:100%;position:absolute;top:50%;left:50%;");
                htmlParts.push(badgesComponent)
            }
            return new Combine(htmlParts).Render();
        })


        return {
            icon:
                {
                    html: new VariableUiElement(mappedHtml),
                    iconSize: [iconW, iconH],
                    iconAnchor: [anchorW, anchorH],
                    popupAnchor: [0, 3 - anchorH],
                    iconUrl: iconUrlStatic,
                    className: clickable ? "leaflet-div-icon" : "leaflet-div-icon unclickable"
                },
            color: color,
            weight: weight,
            dashArray: dashArray
        };
    }


}