import {SubtleButton} from "../Base/SubtleButton";
import Combine from "../Base/Combine";
import Svg from "../../Svg";
import {OsmConnection} from "../../Logic/Osm/OsmConnection";
import Toggle from "../Input/Toggle";
import {UIEventSource} from "../../Logic/UIEventSource";
import Translations from "../i18n/Translations";
import {VariableUiElement} from "../Base/VariableUIElement";
import {Translation} from "../i18n/Translation";
import BaseUIElement from "../BaseUIElement";
import LocationInput from "../Input/LocationInput";
import Loc from "../../Models/Loc";
import {GeoOperations} from "../../Logic/GeoOperations";
import {OsmObject} from "../../Logic/Osm/OsmObject";
import {Changes} from "../../Logic/Osm/Changes";
import ChangeLocationAction from "../../Logic/Osm/Actions/ChangeLocationAction";
import LayoutConfig from "../../Models/ThemeConfig/LayoutConfig";
import MoveConfig from "../../Models/ThemeConfig/MoveConfig";
import {ElementStorage} from "../../Logic/ElementStorage";
import AvailableBaseLayers from "../../Logic/Actors/AvailableBaseLayers";
import BaseLayer from "../../Models/BaseLayer";

interface MoveReason {
    text: Translation | string,
    invitingText: Translation | string,
    icon: BaseUIElement,
    changesetCommentValue: string,
    lockBounds: true | boolean,
    background: undefined | "map" | "photo" | string | string[],
    startZoom: number,
    minZoom: number
}

export default class MoveWizard extends Toggle {
    /**
     * The UI-element which helps moving a point
     */
    constructor(
        featureToMove: any,
        state: {
            osmConnection: OsmConnection,
            featureSwitchUserbadge: UIEventSource<boolean>,
            changes: Changes,
            layoutToUse: LayoutConfig,
            allElements: ElementStorage
        }, options: MoveConfig) {

        const t = Translations.t.move
        const loginButton = new Toggle(
            t.loginToMove.SetClass("btn").onClick(() => state.osmConnection.AttemptLogin()),
            undefined,
            state.featureSwitchUserbadge
        )

        const reasons: MoveReason[] = []
        if (options.enableRelocation) {
            reasons.push({
                text: t.reasons.reasonRelocation,
                invitingText: t.inviteToMove.reasonRelocation,
                icon: Svg.relocation_svg(),
                changesetCommentValue: "relocated",
                lockBounds: false,
                background: undefined,
                startZoom: 12,
                minZoom: 6
            })
        }
        if (options.enableImproveAccuracy) {
            reasons.push({
                text: t.reasons.reasonInaccurate,
                invitingText: t.inviteToMove.reasonInaccurate,
                icon: Svg.crosshair_svg(),
                changesetCommentValue: "improve_accuracy",
                lockBounds: true,
                background: "photo",
                startZoom: 17,
                minZoom: 16
            })
        }

        const currentStep = new UIEventSource<"start" | "reason" | "pick_location" | "moved">("start")
        const moveReason = new UIEventSource<MoveReason>(undefined)
        let moveButton: BaseUIElement;
        if (reasons.length === 1) {
            const reason = reasons[0]
            moveReason.setData(reason)
            moveButton = new SubtleButton(
                reason.icon.SetStyle("height: 1.5rem; width: auto;"),
                Translations.WT(reason.invitingText)
            ).onClick(() => {
                currentStep.setData("pick_location")
            })
        } else {
            moveButton = new SubtleButton(
                Svg.move_ui().SetStyle("height: 1.5rem; width: auto"),
                t.inviteToMove.generic
            ).onClick(() => {
                currentStep.setData("reason")
            })
        }


        const moveAgainButton = new SubtleButton(
            Svg.move_ui(),
            t.inviteToMoveAgain
        ).onClick(() => {
            currentStep.setData("reason")
        })


        const selectReason = new Combine(reasons.map(r => new SubtleButton(r.icon, r.text).onClick(() => {
            moveReason.setData(r)
            currentStep.setData("pick_location")
        })))

        const cancelButton = new SubtleButton(Svg.close_svg(), t.cancel).onClick(() => currentStep.setData("start"))


        const [lon, lat] = GeoOperations.centerpointCoordinates(featureToMove)
        const locationInput = moveReason.map(reason => {
            if (reason === undefined) {
                return undefined
            }
            const loc = new UIEventSource<Loc>({
                lon: lon,
                lat: lat,
                zoom: reason?.startZoom ?? 16
            })

            let background: string[]
            if (typeof reason.background == "string") {
                background = [reason.background]
            } else {
                background = reason.background
            }

            const preferredBackground = AvailableBaseLayers.SelectBestLayerAccordingTo(loc, new UIEventSource(background)).data
            const locationInput = new LocationInput({
                minZoom: reason.minZoom,
                centerLocation: loc,
                mapBackground: new UIEventSource<BaseLayer>(preferredBackground) // We detach the layer
                
            })

            if (reason.lockBounds) {
                locationInput.installBounds(0.05, true)
            }

            locationInput.SetStyle("height: 17.5rem")

            const confirmMove = new SubtleButton(Svg.move_confirm_svg(), t.confirmMove)
            confirmMove.onClick(() => {
                const loc = locationInput.GetValue().data
                state.changes.applyAction(new ChangeLocationAction(featureToMove.properties.id, [loc.lon, loc.lat], {
                    reason: reason.changesetCommentValue,
                    theme: state.layoutToUse.id
                }))
                featureToMove.properties._lat = loc.lat
                featureToMove.properties._lon = loc.lon
                state.allElements.getEventSourceById(id).ping()
                currentStep.setData("moved")
            })
            const zoomInFurhter = t.zoomInFurther.SetClass("alert block m-6")
            return new Combine([
                locationInput,
                new Toggle(confirmMove, zoomInFurhter, locationInput.GetValue().map(l => l.zoom >= 19))
            ]).SetClass("flex flex-col")
        });

        const dialogClasses = "p-2 md:p-4 m-2 border border-gray-400 rounded-xl flex flex-col"

        const moveFlow = new Toggle(
            new VariableUiElement(currentStep.map(currentStep => {
                switch (currentStep) {
                    case "start":
                        return moveButton;
                    case "reason":
                        return new Combine([t.whyMove.SetClass("text-lg font-bold"), selectReason, cancelButton]).SetClass(dialogClasses);
                    case "pick_location":
                        return new Combine([t.moveTitle.SetClass("text-lg font-bold"), new VariableUiElement(locationInput), cancelButton]).SetClass(dialogClasses)
                    case "moved":
                        return new Combine([t.pointIsMoved.SetClass("thanks"), moveAgainButton]).SetClass("flex flex-col");

                }


            })),
            loginButton,
            state.osmConnection.isLoggedIn
        )
        let id = featureToMove.properties.id
        const backend = state.osmConnection._oauth_config.url
        if (id.startsWith(backend)) {
            id = id.substring(backend.length)
        }

        const moveDisallowedReason = new UIEventSource<BaseUIElement>(undefined)
        if (id.startsWith("way")) {
            moveDisallowedReason.setData(t.isWay)
        } else if (id.startsWith("relation")) {
            moveDisallowedReason.setData(t.isRelation)
        } else if (id.indexOf("-") < 0) {

            OsmObject.DownloadReferencingWays(id).then(referencing => {
                if (referencing.length > 0) {
                    console.log("Got a referencing way, move not allowed")
                    moveDisallowedReason.setData(t.partOfAWay)
                }
            })
            OsmObject.DownloadReferencingRelations(id).then(partOf => {
                if (partOf.length > 0) {
                    moveDisallowedReason.setData(t.partOfRelation)
                }
            })
        }
        super(
            moveFlow,
            new Combine([
                Svg.move_not_allowed_svg().SetStyle("height: 2rem").SetClass("m-2"),
                new Combine([t.cannotBeMoved,
                    new VariableUiElement(moveDisallowedReason).SetClass("subtle")
                ]).SetClass("flex flex-col")
            ]).SetClass("flex m-2 p-2 rounded-lg bg-gray-200"),
            moveDisallowedReason.map(r => r === undefined)
        )
    }
}