import { Store, UIEventSource } from "../../Logic/UIEventSource"
import TagRenderingQuestion from "./TagRenderingQuestion"
import Translations from "../i18n/Translations"
import Combine from "../Base/Combine"
import BaseUIElement from "../BaseUIElement"
import { VariableUiElement } from "../Base/VariableUIElement"
import TagRenderingConfig from "../../Models/ThemeConfig/TagRenderingConfig"
import { Unit } from "../../Models/Unit"
import Lazy from "../Base/Lazy"
import { OsmServiceState } from "../../Logic/Osm/OsmConnection"

/**
 * Generates all the questions, one by one
 */
export default class QuestionBox extends VariableUiElement {
    public readonly skippedQuestions: UIEventSource<number[]>
    public readonly restingQuestions: Store<BaseUIElement[]>

    constructor(
        state,
        options: {
            tagsSource: UIEventSource<any>
            tagRenderings: TagRenderingConfig[]
            units: Unit[]
            showAllQuestionsAtOnce?: boolean | Store<boolean>
        }
    ) {
        const skippedQuestions: UIEventSource<number[]> = new UIEventSource<number[]>([])

        const tagsSource = options.tagsSource
        const units = options.units
        options.showAllQuestionsAtOnce = options.showAllQuestionsAtOnce ?? false
        const tagRenderings = options.tagRenderings
            .filter((tr) => tr.question !== undefined)
            .filter((tr) => tr.question !== null)

        let focus: () => void = () => {}

        const tagRenderingQuestions = tagRenderings.map(
            (tagRendering, i) =>
                new Lazy(
                    () =>
                        new TagRenderingQuestion(tagsSource, tagRendering, state, {
                            units: units,
                            afterSave: () => {
                                // We save and indicate progress by pinging and recalculating
                                skippedQuestions.ping()
                                focus()
                            },
                            cancelButton: Translations.t.general.skip
                                .Clone()
                                .SetClass("btn btn-secondary")
                                .onClick(() => {
                                    skippedQuestions.data.push(i)
                                    skippedQuestions.ping()
                                    focus()
                                }),
                        })
                )
        )

        const skippedQuestionsButton = Translations.t.general.skippedQuestions.onClick(() => {
            skippedQuestions.setData([])
        })
        tagsSource.map(
            (tags) => {
                if (tags === undefined) {
                    return undefined
                }
                for (let i = 0; i < tagRenderingQuestions.length; i++) {
                    let tagRendering = tagRenderings[i]

                    if (skippedQuestions.data.indexOf(i) >= 0) {
                        continue
                    }
                    if (tagRendering.IsKnown(tags)) {
                        continue
                    }
                    if (tagRendering.condition) {
                        if (!tagRendering.condition.matchesProperties(tags)) {
                            // Filtered away by the condition, so it is kindof known
                            continue
                        }
                    }

                    // this value is NOT known - this is the question we have to show!
                    return i
                }
                return undefined // The questions are depleted
            },
            [skippedQuestions]
        )

        const questionsToAsk: Store<BaseUIElement[]> = tagsSource.map(
            (tags) => {
                if (tags === undefined) {
                    return []
                }
                const qs = []
                for (let i = 0; i < tagRenderingQuestions.length; i++) {
                    let tagRendering = tagRenderings[i]

                    if (skippedQuestions.data.indexOf(i) >= 0) {
                        continue
                    }
                    if (tagRendering.IsKnown(tags)) {
                        continue
                    }
                    if (tagRendering.condition && !tagRendering.condition.matchesProperties(tags)) {
                        // Filtered away by the condition, so it is kindof known
                        continue
                    }

                    // this value is NOT known - this is the question we have to show!
                    qs.push(tagRenderingQuestions[i])
                }
                return qs
            },
            [skippedQuestions]
        )

        super(
            questionsToAsk.map(
                (allQuestions) => {
                    const apiState: OsmServiceState = state.osmConnection.apiIsOnline.data
                    if (apiState !== "online" && apiState !== "unknown") {
                        return undefined
                    }
                    const els: BaseUIElement[] = []
                    if (
                        options.showAllQuestionsAtOnce === true ||
                        options.showAllQuestionsAtOnce["data"]
                    ) {
                        els.push(...questionsToAsk.data)
                    } else {
                        els.push(allQuestions[0])
                    }

                    if (skippedQuestions.data.length > 0) {
                        els.push(skippedQuestionsButton)
                    }

                    return new Combine(els).SetClass("block mb-8")
                },
                [state.osmConnection.apiIsOnline]
            )
        )

        this.skippedQuestions = skippedQuestions
        this.restingQuestions = questionsToAsk
        focus = () => this.ScrollIntoView()
    }
}