import { ChangeDescription } from "./ChangeDescription"
import OsmChangeAction from "./OsmChangeAction"
import { Changes } from "../Changes"

export default class ChangeLocationAction extends OsmChangeAction {
    private readonly _id: number
    private readonly _newLonLat: [number, number]
    private readonly _meta: { theme: string; reason: string }

    constructor(
        id: string,
        newLonLat: [number, number],
        meta: {
            theme: string
            reason: string
        }
    ) {
        super(id, true)
        if (!id.startsWith("node/")) {
            throw "Invalid ID: only 'node/number' is accepted"
        }
        this._id = Number(id.substring("node/".length))
        this._newLonLat = newLonLat
        this._meta = meta
    }

    protected async CreateChangeDescriptions(changes: Changes): Promise<ChangeDescription[]> {
        const d: ChangeDescription = {
            changes: {
                lat: this._newLonLat[1],
                lon: this._newLonLat[0],
            },
            type: "node",
            id: this._id,
            meta: {
                changeType: "move",
                theme: this._meta.theme,
                specialMotivation: this._meta.reason,
            },
        }

        return [d]
    }
}