import {ReadonlyInputElement} from "./InputElement"
import Loc from "../../Models/Loc"
import {Store, UIEventSource} from "../../Logic/UIEventSource"
import Minimap, {MinimapObj} from "../Base/Minimap"
import BaseLayer from "../../Models/BaseLayer"
import Combine from "../Base/Combine"
import Svg from "../../Svg"
import {GeoOperations} from "../../Logic/GeoOperations"
import ShowDataMultiLayer from "../ShowDataLayer/ShowDataMultiLayer"
import StaticFeatureSource from "../../Logic/FeatureSource/Sources/StaticFeatureSource"
import LayerConfig from "../../Models/ThemeConfig/LayerConfig"
import {BBox} from "../../Logic/BBox"
import {FixedUiElement} from "../Base/FixedUiElement"
import ShowDataLayer from "../ShowDataLayer/ShowDataLayer"
import BaseUIElement from "../BaseUIElement"
import Toggle from "./Toggle"
import * as matchpoint from "../../assets/layers/matchpoint/matchpoint.json"
import LayoutConfig from "../../Models/ThemeConfig/LayoutConfig";
import FilteredLayer from "../../Models/FilteredLayer";
import {ElementStorage} from "../../Logic/ElementStorage";

export default class LocationInput
    extends BaseUIElement
    implements ReadonlyInputElement<Loc>, MinimapObj {
    private static readonly matchLayer = new LayerConfig(
        matchpoint,
        "LocationInput.matchpoint",
        true
    )

    public readonly snappedOnto: UIEventSource<any> = new UIEventSource<any>(undefined)
    public readonly _matching_layer: LayerConfig
    public readonly leafletMap: UIEventSource<any>
    public readonly bounds
    public readonly location
    private readonly _centerLocation: UIEventSource<Loc>
    private readonly mapBackground: UIEventSource<BaseLayer>
    /**
     * The features to which the input should be snapped
     * @private
     */
    private readonly _snapTo: Store<{ feature: any }[]>
    private readonly _value: Store<Loc>
    private readonly _snappedPoint: Store<any>
    private readonly _maxSnapDistance: number
    private readonly _snappedPointTags: any
    private readonly _bounds: UIEventSource<BBox>
    private readonly map: BaseUIElement & MinimapObj
    private readonly clickLocation: UIEventSource<Loc>
    private readonly _minZoom: number
    private readonly _state: {
        readonly filteredLayers: Store<FilteredLayer[]>;
        readonly backgroundLayer: UIEventSource<BaseLayer>;
        readonly layoutToUse: LayoutConfig;
        readonly selectedElement: UIEventSource<any>;
        readonly allElements: ElementStorage
    }

    constructor(options: {
        minZoom?: number
        mapBackground?: UIEventSource<BaseLayer>
        snapTo?: UIEventSource<{ feature: any }[]>
        maxSnapDistance?: number
        snappedPointTags?: any
        requiresSnapping?: boolean
        centerLocation: UIEventSource<Loc>
        bounds?: UIEventSource<BBox>
        state: {
            readonly filteredLayers: Store<FilteredLayer[]>;
            readonly backgroundLayer: UIEventSource<BaseLayer>;
            readonly layoutToUse: LayoutConfig;
            readonly selectedElement: UIEventSource<any>;
            readonly allElements: ElementStorage
        }
    }) {
        super()
        this._snapTo = options.snapTo?.map((features) =>
            features?.filter((feat) => feat.feature.geometry.type !== "Point")
        )
        this._maxSnapDistance = options.maxSnapDistance
        this._centerLocation = options.centerLocation
        this._snappedPointTags = options.snappedPointTags
        this._bounds = options.bounds
        this._minZoom = options.minZoom
        this._state = options.state
        if (this._snapTo === undefined) {
            this._value = this._centerLocation
        } else {
            const self = this

            if (self._snappedPointTags !== undefined) {
                const layout = this._state.layoutToUse

                let matchingLayer = LocationInput.matchLayer
                for (const layer of layout.layers) {
                    if (layer.source.osmTags.matchesProperties(self._snappedPointTags)) {
                        matchingLayer = layer
                    }
                }
                this._matching_layer = matchingLayer
            } else {
                this._matching_layer = LocationInput.matchLayer
            }

            this._snappedPoint = options.centerLocation.map(
                (loc) => {
                    if (loc === undefined) {
                        return undefined
                    }

                    // We reproject the location onto every 'snap-to-feature' and select the closest

                    let min = undefined
                    let matchedWay = undefined
                    for (const feature of self._snapTo.data ?? []) {
                        try {
                            const nearestPointOnLine = GeoOperations.nearestPoint(feature.feature, [
                                loc.lon,
                                loc.lat,
                            ])
                            if (min === undefined) {
                                min = nearestPointOnLine
                                matchedWay = feature.feature
                                continue
                            }

                            if (min.properties.dist > nearestPointOnLine.properties.dist) {
                                min = nearestPointOnLine
                                matchedWay = feature.feature
                            }
                        } catch (e) {
                            console.log(
                                "Snapping to a nearest point failed for ",
                                feature.feature,
                                "due to ",
                                e
                            )
                        }
                    }

                    if (min === undefined || min.properties.dist * 1000 > self._maxSnapDistance) {
                        if (options.requiresSnapping) {
                            return undefined
                        } else {
                            return {
                                type: "Feature",
                                properties: options.snappedPointTags ?? min.properties,
                                geometry: {type: "Point", coordinates: [loc.lon, loc.lat]},
                            }
                        }
                    }
                    min.properties = options.snappedPointTags ?? min.properties
                    self.snappedOnto.setData(matchedWay)
                    return min
                },
                [this._snapTo]
            )

            this._value = this._snappedPoint.map((f) => {
                const [lon, lat] = f.geometry.coordinates
                return {
                    lon: lon,
                    lat: lat,
                    zoom: undefined,
                }
            })
        }
        this.mapBackground = options.mapBackground ?? this._state?.backgroundLayer
        this.SetClass("block h-full")

        this.clickLocation = new UIEventSource<Loc>(undefined)
        this.map = Minimap.createMiniMap({
            location: this._centerLocation,
            background: this.mapBackground,
            attribution: this.mapBackground !== this._state?.backgroundLayer,
            lastClickLocation: this.clickLocation,
            bounds: this._bounds,
            addLayerControl: true,
        })
        this.leafletMap = this.map.leafletMap
        this.location = this.map.location
    }

    GetValue(): Store<Loc> {
        return this._value
    }

    IsValid(t: Loc): boolean {
        return t !== undefined
    }

    installBounds(factor: number | BBox, showRange?: boolean): void {
        this.map.installBounds(factor, showRange)
    }

    protected InnerConstructElement(): HTMLElement {
        try {
            const self = this
            const hasMoved = new UIEventSource(false)
            const startLocation = {...this._centerLocation.data}
            this._centerLocation.addCallbackD((newLocation) => {
                const f = 100000
                console.log(newLocation.lon, startLocation.lon)
                const diff =
                    Math.abs(newLocation.lon * f - startLocation.lon * f) +
                    Math.abs(newLocation.lat * f - startLocation.lat * f)
                if (diff < 1) {
                    return
                }
                hasMoved.setData(true)
                return true
            })
            this.clickLocation.addCallbackAndRunD((location) =>
                this._centerLocation.setData(location)
            )
            if (this._snapTo !== undefined) {
                // Show the lines to snap to
                console.log("Constructing the snap-to layer", this._snapTo)
                new ShowDataMultiLayer({
                    features: StaticFeatureSource.fromDateless(this._snapTo),
                    zoomToFeatures: false,
                    leafletMap: this.map.leafletMap,
                    layers: this._state.filteredLayers,
                })
                // Show the central point
                const matchPoint = this._snappedPoint.map((loc) => {
                    if (loc === undefined) {
                        return []
                    }
                    return [{feature: loc}]
                })
                console.log("Constructing the match layer", matchPoint)

                new ShowDataLayer({
                    features: StaticFeatureSource.fromDateless(matchPoint),
                    zoomToFeatures: false,
                    leafletMap: this.map.leafletMap,
                    layerToShow: this._matching_layer,
                    state: this._state,
                    selectedElement: this._state.selectedElement,
                })
            }
            this.mapBackground.map(
                (layer) => {
                    const leaflet = this.map.leafletMap.data
                    if (leaflet === undefined || layer === undefined) {
                        return
                    }

                    leaflet.setMaxZoom(layer.max_zoom)
                    leaflet.setMinZoom(self._minZoom ?? layer.max_zoom - 2)
                    leaflet.setZoom(layer.max_zoom - 1)
                },
                [this.map.leafletMap]
            )

            const animatedHand = Svg.hand_ui()
                .SetStyle("width: 2rem; height: unset;")
                .SetClass("hand-drag-animation block pointer-events-none")

            return new Combine([
                new Combine([
                    Svg.move_arrows_ui()
                        .SetClass("block relative pointer-events-none")
                        .SetStyle("left: -2.5rem; top: -2.5rem; width: 5rem; height: 5rem"),
                ])
                    .SetClass("block w-0 h-0 z-10 relative")
                    .SetStyle(
                        "background: rgba(255, 128, 128, 0.21); left: 50%; top: 50%; opacity: 0.5"
                    ),

                new Toggle(undefined, animatedHand, hasMoved)
                    .SetClass("block w-0 h-0 z-10 relative")
                    .SetStyle("left: calc(50% + 3rem); top: calc(50% + 2rem); opacity: 0.7"),

                this.map.SetClass("z-0 relative block w-full h-full bg-gray-100"),
            ]).ConstructElement()
        } catch (e) {
            console.error("Could not generate LocationInputElement:", e)
            return new FixedUiElement("Constructing a locationInput failed due to" + e)
                .SetClass("alert")
                .ConstructElement()
        }
    }

    TakeScreenshot(format: "image"): Promise<string>;
    TakeScreenshot(format: "blob"): Promise<Blob>;
    TakeScreenshot(format: "image" | "blob"): Promise<string | Blob>;
    TakeScreenshot(format: "image" | "blob"): Promise<string | Blob> {
        return this.map.TakeScreenshot(format)
    }
}