import Combine from "../Base/Combine"
import { FlowStep } from "./FlowStep"
import { BBox } from "../../Logic/BBox"
import LayerConfig from "../../Models/ThemeConfig/LayerConfig"
import { Store, UIEventSource } from "../../Logic/UIEventSource"
import CreateNoteImportLayer from "../../Models/ThemeConfig/Conversion/CreateNoteImportLayer"
import FilteredLayer, { FilterState } from "../../Models/FilteredLayer"
import GeoJsonSource from "../../Logic/FeatureSource/Sources/GeoJsonSource"
import MetaTagging from "../../Logic/MetaTagging"
import RelationsTracker from "../../Logic/Osm/RelationsTracker"
import FilteringFeatureSource from "../../Logic/FeatureSource/Sources/FilteringFeatureSource"
import Minimap from "../Base/Minimap"
import ShowDataLayer from "../ShowDataLayer/ShowDataLayer"
import FeatureInfoBox from "../Popup/FeatureInfoBox"
import { ImportUtils } from "./ImportUtils"
import import_candidate from "../../assets/layers/import_candidate/import_candidate.json"
import StaticFeatureSource from "../../Logic/FeatureSource/Sources/StaticFeatureSource"
import Title from "../Base/Title"
import Loading from "../Base/Loading"
import { VariableUiElement } from "../Base/VariableUIElement"
import known_layers from "../../assets/generated/known_layers.json"
import { LayerConfigJson } from "../../Models/ThemeConfig/Json/LayerConfigJson"
import Translations from "../i18n/Translations"
import { Feature } from "geojson"
import DivContainer from "../Base/DivContainer"

/**
 * Filters out points for which the import-note already exists, to prevent duplicates
 */
export class CompareToAlreadyExistingNotes
    extends Combine
    implements FlowStep<{ bbox: BBox; layer: LayerConfig; features: any[]; theme: string }>
{
    public IsValid: Store<boolean>
    public Value: Store<{ bbox: BBox; layer: LayerConfig; features: any[]; theme: string }>

    constructor(state, params: { bbox: BBox; layer: LayerConfig; features: any[]; theme: string }) {
        const t = Translations.t.importHelper.compareToAlreadyExistingNotes
        const layerConfig = known_layers.layers.filter((l) => l.id === params.layer.id)[0]
        if (layerConfig === undefined) {
            console.error("WEIRD: layer not found in the builtin layer overview")
        }
        const importLayerJson = new CreateNoteImportLayer(150).convertStrict(
            <LayerConfigJson>layerConfig,
            "CompareToAlreadyExistingNotes"
        )
        const importLayer = new LayerConfig(importLayerJson, "import-layer-dynamic")
        const flayer: FilteredLayer = {
            appliedFilters: new UIEventSource<Map<string, FilterState>>(
                new Map<string, FilterState>()
            ),
            isDisplayed: new UIEventSource<boolean>(true),
            layerDef: importLayer,
        }
        const allNotesWithinBbox = new GeoJsonSource(flayer, params.bbox.padAbsolute(0.0001))

        allNotesWithinBbox.features.map((f) =>
            MetaTagging.addMetatags(
                f,
                {
                    memberships: new RelationsTracker(),
                    getFeaturesWithin: () => [],
                    getFeatureById: () => undefined,
                },
                importLayer,
                state,
                {
                    includeDates: true,
                    // We assume that the non-dated metatags are already set by the cache generator
                    includeNonDates: true,
                }
            )
        )
        const alreadyOpenImportNotes = new FilteringFeatureSource(
            state,
            undefined,
            allNotesWithinBbox
        )
        const map = Minimap.createMiniMap()
        map.SetClass("w-full").SetStyle("height: 500px")

        const comparisonMap = Minimap.createMiniMap({
            location: map.location,
        })
        comparisonMap.SetClass("w-full").SetStyle("height: 500px")

        new ShowDataLayer({
            layerToShow: importLayer,
            state,
            zoomToFeatures: true,
            leafletMap: map.leafletMap,
            features: alreadyOpenImportNotes,
            popup: (tags, layer) => new FeatureInfoBox(tags, layer, state),
        })

        const maxDistance = new UIEventSource<number>(10)

        const partitionedImportPoints = ImportUtils.partitionFeaturesIfNearby(
            params,
            alreadyOpenImportNotes.features.map((ff) => ({ features: ff.map((ff) => ff.feature) })),
            maxDistance
        )

        new ShowDataLayer({
            layerToShow: new LayerConfig(import_candidate),
            state,
            zoomToFeatures: true,
            leafletMap: comparisonMap.leafletMap,
            features: StaticFeatureSource.fromGeojsonStore(
                partitionedImportPoints.map((p) => <Feature[]>p.hasNearby)
            ),
            popup: (tags, layer) => new FeatureInfoBox(tags, layer, state),
        })

        super([
            new Title(t.titleLong),
            new VariableUiElement(
                alreadyOpenImportNotes.features.map(
                    (notesWithImport) => {
                        if (
                            allNotesWithinBbox.state.data !== undefined &&
                            allNotesWithinBbox.state.data["error"] !== undefined
                        ) {
                            const error = allNotesWithinBbox.state.data["error"]
                            t.loadingFailed.Subs({ error })
                        }
                        if (
                            allNotesWithinBbox.features.data === undefined ||
                            allNotesWithinBbox.features.data.length === 0
                        ) {
                            return new Loading(t.loading)
                        }
                        if (notesWithImport.length === 0) {
                            return t.noPreviousNotesFound.SetClass("thanks")
                        }
                        return new Combine([
                            t.mapExplanation.Subs(params.features),
                            map,
                            new DivContainer("fullscreen"),
                            new VariableUiElement(
                                partitionedImportPoints.map(({ noNearby, hasNearby }) => {
                                    if (noNearby.length === 0) {
                                        // Nothing can be imported
                                        return t.completelyImported
                                            .SetClass("alert w-full block")
                                            .SetStyle("padding: 0.5rem")
                                    }

                                    if (hasNearby.length === 0) {
                                        // All points can be imported
                                        return t.nothingNearby
                                            .SetClass("thanks w-full block")
                                            .SetStyle("padding: 0.5rem")
                                    }

                                    return new Combine([
                                        t.someNearby
                                            .Subs({
                                                hasNearby: hasNearby.length,
                                                distance: maxDistance.data,
                                            })
                                            .SetClass("alert"),
                                        t.wontBeImported,
                                        comparisonMap.SetClass("w-full"),
                                    ]).SetClass("w-full")
                                })
                            ),
                        ]).SetClass("flex flex-col")
                    },
                    [allNotesWithinBbox.features, allNotesWithinBbox.state]
                )
            ),
        ])
        this.SetClass("flex flex-col")
        this.Value = partitionedImportPoints.map(({ noNearby }) => ({
            features: noNearby,
            bbox: params.bbox,
            layer: params.layer,
            theme: params.theme,
        }))

        this.IsValid = alreadyOpenImportNotes.features.map(
            (ff) => {
                if (allNotesWithinBbox.features.data.length === 0) {
                    // Not yet loaded
                    return false
                }
                if (ff.length == 0) {
                    // No import notes at all
                    return true
                }

                return partitionedImportPoints.data.noNearby.length > 0 // at least _something_ can be imported
            },
            [partitionedImportPoints, allNotesWithinBbox.features]
        )
    }
}