import Combine from "../Base/Combine"
import { Store, UIEventSource } from "../../Logic/UIEventSource"
import UserRelatedState from "../../Logic/State/UserRelatedState"
import Translations from "../i18n/Translations"
import { Utils } from "../../Utils"
import { FlowStep } from "./FlowStep"
import Title from "../Base/Title"
import BaseUIElement from "../BaseUIElement"
import Histogram from "../BigComponents/Histogram"
import Toggleable from "../Base/Toggleable"
import List from "../Base/List"
import CheckBoxes from "../Input/Checkboxes"
import { Feature, Point } from "geojson"

/**
 * Shows the attributes by value, requests to check them of
 */
export class PreviewAttributesPanel
    extends Combine
    implements FlowStep<{ features: Feature<Point>[] }>
{
    public readonly IsValid: Store<boolean>
    public readonly Value: Store<{ features: Feature<Point>[] }>

    constructor(state: UserRelatedState, geojson: { features: Feature<Point>[] }) {
        const t = Translations.t.importHelper.previewAttributes

        const propertyKeys = new Set<string>()
        for (const f of geojson.features) {
            Object.keys(f.properties).forEach((key) => propertyKeys.add(key))
        }

        const attributeOverview: BaseUIElement[] = []

        const n = geojson.features.length
        for (const key of Array.from(propertyKeys)) {
            const values = Utils.NoNull(geojson.features.map((f) => f.properties[key]))
            const allSame = !values.some((v) => v !== values[0])
            let countSummary: BaseUIElement
            if (values.length === n) {
                countSummary = t.allAttributesSame
            } else {
                countSummary = t.someHaveSame.Subs({
                    count: values.length,
                    percentage: Math.floor((100 * values.length) / n),
                })
            }
            if (allSame) {
                attributeOverview.push(new Title(key + "=" + values[0]))
                attributeOverview.push(countSummary)
                continue
            }

            const uniqueCount = new Set(values).size
            if (uniqueCount !== values.length && uniqueCount < 15) {
                attributeOverview.push()
                // There are some overlapping values: histogram time!
                let hist: BaseUIElement = new Combine([
                    countSummary,
                    new Histogram(new UIEventSource<string[]>(values), "Value", "Occurence", {
                        sortMode: "count-rev",
                    }),
                ]).SetClass("flex flex-col")

                const title = new Title(key + "=*")
                if (uniqueCount > 15) {
                    hist = new Toggleable(title, hist.SetClass("block")).Collapse()
                } else {
                    attributeOverview.push(title)
                }

                attributeOverview.push(hist)
                continue
            }

            // All values are different or too much unique values, we add a boring (but collapsable) list
            attributeOverview.push(
                new Toggleable(new Title(key + "=*"), new Combine([countSummary, new List(values)]))
            )
        }

        const confirm = new CheckBoxes([t.inspectLooksCorrect])

        super([
            new Title(t.inspectDataTitle.Subs({ count: geojson.features.length })),
            "Extra remark: An attribute with 'source' or 'src' will be added as 'source' into the map pin; an attribute 'note' will be added into the map pin as well. These values won't be imported",
            ...attributeOverview,
            confirm,
        ])

        this.Value = new UIEventSource<{ features: Feature<Point>[] }>(geojson)
        this.IsValid = confirm.GetValue().map((selected) => selected.length == 1)
    }
}