import {GeoOperations} from "./GeoOperations";
import State from "../State";
import {And} from "./Tags/And";
import {Tag} from "./Tags/Tag";
import {Or} from "./Tags/Or";
import {Utils} from "../Utils";
import opening_hours from "opening_hours";
import {UIElement} from "../UI/UIElement";
import Combine from "../UI/Base/Combine";


const cardinalDirections = {
    N:   0, NNE:  22.5, NE:  45, ENE:  67.5,
    E:  90, ESE: 112.5, SE: 135, SSE: 157.5,
    S: 180, SSW: 202.5, SW: 225, WSW: 247.5,
    W: 270, WNW: 292.5, NW: 315, NNW: 337.5
}


export default class SimpleMetaTagger {
    static coder: any;
    public static readonly objectMetaInfo = new SimpleMetaTagger(
        {
            keys: ["_last_edit:contributor",
                "_last_edit:contributor:uid",
                "_last_edit:changeset",
                "_last_edit:timestamp",
                "_version_number"],
            doc: "Information about the last edit of this object."
        },
        (feature) => {/*Note: also handled by 'UpdateTagsFromOsmAPI'*/

            const tgs = feature.properties;
            
            function move(src: string, target: string){
                if(tgs[src] === undefined){
                    return;
                }
                tgs[target] = tgs[src]
                delete tgs[src]
            }
            
            move("user","_last_edit:contributor")
            move("uid","_last_edit:contributor:uid")
            move("changeset","_last_edit:changeset")
            move("timestamp","_last_edit:timestamp")
            move("version","_version_number")
        }
    )
    private static latlon = new SimpleMetaTagger({
            keys: ["_lat", "_lon"],
            doc: "The latitude and longitude of the point (or centerpoint in the case of a way/area)"
        },
        (feature => {
            const centerPoint = GeoOperations.centerpoint(feature);
            const lat = centerPoint.geometry.coordinates[1];
            const lon = centerPoint.geometry.coordinates[0];
            feature.properties["_lat"] = "" + lat;
            feature.properties["_lon"] = "" + lon;
            feature._lon = lon; // This is dirty, I know
            feature._lat = lat;
        })
    );
    private static surfaceArea = new SimpleMetaTagger(
        {
            keys: ["_surface", "_surface:ha"],
            doc: "The surface area of the feature, in square meters and in hectare. Not set on points and ways"
        },
        (feature => {
            const sqMeters = GeoOperations.surfaceAreaInSqMeters(feature);
            feature.properties["_surface"] = "" + sqMeters;
            feature.properties["_surface:ha"] = "" + Math.floor(sqMeters / 1000) / 10;
            feature.area = sqMeters;
        })
    );
    private static lngth = new SimpleMetaTagger(
        {
            keys: ["_length", "_length:km"],
            doc: "The total length of a feature in meters (and in kilometers, rounded to one decimal for '_length:km'). For a surface, the length of the perimeter"
        },
        (feature => {
            const l = GeoOperations.lengthInMeters(feature)
            feature.properties["_length"] = "" + l
            const km = Math.floor(l / 1000)
            const kmRest = Math.round((l - km * 1000) / 100)
            feature.properties["_length:km"] = "" + km + "." + kmRest
        })
    )
    private static country = new SimpleMetaTagger(
        {
            keys: ["_country"],
            doc: "The country code of the property (with latlon2country)"
        },
        feature => {


            let centerPoint: any = GeoOperations.centerpoint(feature);
            const lat = centerPoint.geometry.coordinates[1];
            const lon = centerPoint.geometry.coordinates[0];

            SimpleMetaTagger.GetCountryCodeFor(lon, lat, (countries) => {
                try {
                    feature.properties["_country"] = countries[0].trim().toLowerCase();
                    const tagsSource = State.state.allElements.getEventSourceById(feature.properties.id);
                    tagsSource.ping();
                } catch (e) {
                    console.warn(e)
                }
            });
        }
    )
    private static isOpen = new SimpleMetaTagger(
        {
            keys: ["_isOpen", "_isOpen:description"],
            doc: "If 'opening_hours' is present, it will add the current state of the feature (being 'yes' or 'no')",
            includesDates: true
        },
        (feature => {
            if (Utils.runningFromConsole) {
                // We are running from console, thus probably creating a cache
                // isOpen is irrelevant
                return
            }

            const tagsSource = State.state.allElements.getEventSourceById(feature.properties.id);
            tagsSource.addCallbackAndRun(tags => {
                if (tags.opening_hours === undefined || tags._country === undefined) {
                    return;
                }
                try {

                    const oh = new opening_hours(tags["opening_hours"], {
                        lat: tags._lat,
                        lon: tags._lon,
                        address: {
                            country_code: tags._country.toLowerCase()
                        }
                    }, {tag_key: "opening_hours"});
                    // AUtomatically triggered on the next change
                    const updateTags = () => {
                        const oldValueIsOpen = tags["_isOpen"];
                        const oldNextChange = tags["_isOpen:nextTrigger"] ?? 0;

                        if (oldNextChange > (new Date()).getTime() &&
                            tags["_isOpen:oldvalue"] === tags["opening_hours"]) {
                            // Already calculated and should not yet be triggered
                            return;
                        }

                        tags["_isOpen"] = oh.getState() ? "yes" : "no";
                        const comment = oh.getComment();
                        if (comment) {
                            tags["_isOpen:description"] = comment;
                        }

                        if (oldValueIsOpen !== tags._isOpen) {
                            tagsSource.ping();
                        }

                        const nextChange = oh.getNextChange();
                        if (nextChange !== undefined) {
                            const timeout = nextChange.getTime() - (new Date()).getTime();
                            tags["_isOpen:nextTrigger"] = nextChange.getTime();
                            tags["_isOpen:oldvalue"] = tags.opening_hours
                            window.setTimeout(
                                () => {
                                    console.log("Updating the _isOpen tag for ", tags.id, ", it's timer expired after", timeout);
                                    updateTags();
                                },
                                timeout
                            )
                        }
                    }
                    updateTags();
                } catch (e) {
                    console.warn("Error while parsing opening hours of ", tags.id, e);
                    tags["_isOpen"] = "parse_error";
                }

            })
        })
    )
    private static directionSimplified = new SimpleMetaTagger(
        {
            keys: ["_direction:numerical", "_direction:leftright"],
            doc: "_direction:numerical is a normalized, numerical direction based on 'camera:direction' or on 'direction'; it is only present if a valid direction is found (e.g. 38.5 or NE). _direction:leftright is either 'left' or 'right', which is left-looking on the map or 'right-looking' on the map"
        },
        (feature => {
            const tags = feature.properties;
            const direction = tags["camera:direction"] ?? tags["direction"];
            if (direction === undefined) {
                return;
            }
            const n = cardinalDirections[direction] ?? Number(direction);
            if (isNaN(n)) {
                return;
            }

            // The % operator has range (-360, 360). We apply a trick to get [0, 360).
            const normalized = ((n % 360) + 360) % 360;

            tags["_direction:numerical"] = normalized;
            tags["_direction:leftright"] = normalized <= 180 ? "right" : "left";

        })
    )
    private static carriageWayWidth = new SimpleMetaTagger(
        {
            keys: ["_width:needed", "_width:needed:no_pedestrians", "_width:difference"],
            doc: "Legacy for a specific project calculating the needed width for safe traffic on a road. Only activated if 'width:carriageway' is present"
        },
        (feature: any, index: number) => {

            const properties = feature.properties;
            if (properties["width:carriageway"] === undefined) {
                return;
            }

            const carWidth = 2;
            const cyclistWidth = 1.5;
            const pedestrianWidth = 0.75;


            const _leftSideParking =
                new And([new Tag("parking:lane:left", "parallel"), new Tag("parking:lane:right", "no_parking")]);
            const _rightSideParking =
                new And([new Tag("parking:lane:right", "parallel"), new Tag("parking:lane:left", "no_parking")]);

            const _bothSideParking = new Tag("parking:lane:both", "parallel");
            const _noSideParking = new Tag("parking:lane:both", "no_parking");
            const _otherParkingMode =
                new Or([
                    new Tag("parking:lane:both", "perpendicular"),
                    new Tag("parking:lane:left", "perpendicular"),
                    new Tag("parking:lane:right", "perpendicular"),
                    new Tag("parking:lane:both", "diagonal"),
                    new Tag("parking:lane:left", "diagonal"),
                    new Tag("parking:lane:right", "diagonal"),
                ])

            const _sidewalkBoth = new Tag("sidewalk", "both");
            const _sidewalkLeft = new Tag("sidewalk", "left");
            const _sidewalkRight = new Tag("sidewalk", "right");
            const _sidewalkNone = new Tag("sidewalk", "none");


            let parallelParkingCount = 0;


            const _oneSideParking = new Or([_leftSideParking, _rightSideParking]);

            if (_oneSideParking.matchesProperties(properties)) {
                parallelParkingCount = 1;
            } else if (_bothSideParking.matchesProperties(properties)) {
                parallelParkingCount = 2;
            } else if (_noSideParking.matchesProperties(properties)) {
                parallelParkingCount = 0;
            } else if (_otherParkingMode.matchesProperties(properties)) {
                parallelParkingCount = 0;
            } else {
                console.log("No parking data for ", properties.name, properties.id, properties)
            }


            let pedestrianFlowNeeded;
            if (_sidewalkBoth.matchesProperties(properties)) {
                pedestrianFlowNeeded = 0;
            } else if (_sidewalkNone.matchesProperties(properties)) {
                pedestrianFlowNeeded = 2;
            } else if (_sidewalkLeft.matchesProperties(properties) || _sidewalkRight.matchesProperties(properties)) {
                pedestrianFlowNeeded = 1;
            } else {
                pedestrianFlowNeeded = -1;
            }


            let onewayCar = properties.oneway === "yes";
            let onewayBike = properties["oneway:bicycle"] === "yes" ||
                (onewayCar && properties["oneway:bicycle"] === undefined)

            let cyclingAllowed =
                !(properties.bicycle === "use_sidepath"
                    || properties.bicycle === "no");

            let carWidthUsed = (onewayCar ? 1 : 2) * carWidth;
            properties["_width:needed:cars"] = Utils.Round(carWidthUsed);
            properties["_width:needed:parking"] = Utils.Round(parallelParkingCount * carWidth)


            let cyclistWidthUsed = 0;
            if (cyclingAllowed) {
                cyclistWidthUsed = (onewayBike ? 1 : 2) * cyclistWidth;
            }
            properties["_width:needed:cyclists"] = Utils.Round(cyclistWidthUsed)


            const width = parseFloat(properties["width:carriageway"]);


            const targetWidthIgnoringPedestrians =
                carWidthUsed +
                cyclistWidthUsed +
                parallelParkingCount * carWidthUsed;
            properties["_width:needed:no_pedestrians"] = Utils.Round(targetWidthIgnoringPedestrians);

            const pedestriansNeed = Math.max(0, pedestrianFlowNeeded) * pedestrianWidth;
            const targetWidth = targetWidthIgnoringPedestrians + pedestriansNeed;
            properties["_width:needed"] = Utils.Round(targetWidth);
            properties["_width:needed:pedestrians"] = Utils.Round(pedestriansNeed)


            properties["_width:difference"] = Utils.Round(targetWidth - width);
            properties["_width:difference:no_pedestrians"] = Utils.Round(targetWidthIgnoringPedestrians - width);

        }
    );
    private static currentTime = new SimpleMetaTagger(
        {
            keys: ["_now:date", "_now:datetime", "_loaded:date", "_loaded:_datetime"],
            doc: "Adds the time that the data got loaded - pretty much the time of downloading from overpass. The format is YYYY-MM-DD hh:mm, aka 'sortable' aka ISO-8601-but-not-entirely",
            includesDates: true
        },
        (feature, _, freshness) => {
            const now = new Date();

            if (typeof freshness === "string") {
                freshness = new Date(freshness)
            }

            function date(d: Date) {
                return d.toISOString().slice(0, 10);
            }

            function datetime(d: Date) {
                return d.toISOString().slice(0, -5).replace("T", " ");
            }

            feature.properties["_now:date"] = date(now);
            feature.properties["_now:datetime"] = datetime(now);
            feature.properties["_loaded:date"] = date(freshness);
            feature.properties["_loaded:datetime"] = datetime(freshness);

        }
    )
    public static metatags = [
        SimpleMetaTagger.latlon,
        SimpleMetaTagger.surfaceArea,
        SimpleMetaTagger.lngth,
        SimpleMetaTagger.country,
        SimpleMetaTagger.isOpen,
        SimpleMetaTagger.carriageWayWidth,
        SimpleMetaTagger.directionSimplified,
        SimpleMetaTagger.currentTime,
        SimpleMetaTagger.objectMetaInfo

    ];
    public readonly keys: string[];
    public readonly doc: string;
    public readonly includesDates: boolean
    private readonly _f: (feature: any, index: number, freshness: Date) => void;

    constructor(docs: { keys: string[], doc: string, includesDates?: boolean }, f: ((feature: any, index: number, freshness: Date) => void)) {
        this.keys = docs.keys;
        this.doc = docs.doc;
        this._f = f;
        this.includesDates = docs.includesDates ?? false;
        for (const key of docs.keys) {
            if (!key.startsWith('_')) {
                throw `Incorrect metakey ${key}: it should start with underscore (_)`
            }
        }
    }

    static GetCountryCodeFor(lon: number, lat: number, callback: (country: string) => void) {
        SimpleMetaTagger.coder?.GetCountryCodeFor(lon, lat, callback)
    }

    static HelpText(): UIElement {
        const subElements: UIElement[] = [
            new Combine([
                "<h2>Metatags</h2>",
                "<p>Metatags are extra tags available, in order to display more data or to give better questions.</p>",
                "<p>The are calculated automatically on every feature when the data arrives in the webbrowser. This document gives an overview of the available metatags.</p>",
                "<p><b>Hint:</b> when using metatags, add the <a href='URL_Parameters.md'>query parameter</a> <code>debug=true</code> to the URL. This will include a box in the popup for features which shows all the properties of the object</p>"
            ])


        ];

        for (const metatag of SimpleMetaTagger.metatags) {
            subElements.push(
                new Combine([
                    "<h3>", metatag.keys.join(", "), "</h3>",
                    metatag.doc]
                )
            )
        }

        return new Combine(subElements)
    }

    addMetaTags(features: { feature: any, freshness: Date }[]) {
        for (let i = 0; i < features.length; i++) {
            let feature = features[i];
            this._f(feature.feature, i, feature.freshness);
        }
    }


}