import {UIEventSource} from "../../Logic/UIEventSource";
import Combine from "../Base/Combine";
import State from "../../State";
import {FixedUiElement} from "../Base/FixedUiElement";
import {OH} from "./OpeningHours";
import Translations from "../i18n/Translations";
import Constants from "../../Models/Constants";
import opening_hours from "opening_hours";
import BaseUIElement from "../BaseUIElement";
import Toggle from "../Input/Toggle";
import {VariableUiElement} from "../Base/VariableUIElement";
import Table from "../Base/Table";
import {Translation} from "../i18n/Translation";
import {UIElement} from "../UIElement";

export default class OpeningHoursVisualization extends UIElement {
    private static readonly weekdays: Translation[] = [
        Translations.t.general.weekdays.abbreviations.monday,
        Translations.t.general.weekdays.abbreviations.tuesday,
        Translations.t.general.weekdays.abbreviations.wednesday,
        Translations.t.general.weekdays.abbreviations.thursday,
        Translations.t.general.weekdays.abbreviations.friday,
        Translations.t.general.weekdays.abbreviations.saturday,
        Translations.t.general.weekdays.abbreviations.sunday,
    ]
    private readonly _tags: UIEventSource<any>;
    private readonly _key: string;

    constructor(tags: UIEventSource<any>, key: string) {
        super()
        this._tags = tags;
        this._key = key;
    }
    
    InnerRender(): BaseUIElement {
        const tags = this._tags;
        const key = this._key;
        const tagsDirect = tags.data;
        const ohTable = new VariableUiElement(tags
            .map(tags => tags[key]) // This mapping will absorb all other changes to tags in order to prevent regeneration
            .map(ohtext => {
                    try {
                        // noinspection JSPotentiallyInvalidConstructorUsage
                        const oh = new opening_hours(ohtext, {
                            lat: tagsDirect._lat,
                            lon: tagsDirect._lon,
                            address: {
                                country_code: tagsDirect._country
                            }
                        }, {tag_key: this._key});

                        return OpeningHoursVisualization.CreateFullVisualisation(oh)
                    } catch (e) {
                        console.log(e);
                        return new Combine([Translations.t.general.opening_hours.error_loading,
                            new Toggle(
                                new FixedUiElement(e).SetClass("subtle"),
                                undefined,
                                State.state?.osmConnection?.userDetails.map(userdetails => userdetails.csCount >= Constants.userJourney.tagsVisibleAndWikiLinked)
                            )
                        ]);
                    }

                }
            ))

        return new Toggle(
            ohTable,
            Translations.t.general.opening_hours.loadingCountry.Clone(),
            tags.map(tgs => tgs._country !== undefined)
        );
    }

    private static CreateFullVisualisation(oh: any): BaseUIElement {

        /** First, we determine which range of dates we want to visualize: this week or next week?**/

        const today = new Date();
        today.setHours(0, 0, 0, 0);
        const lastMonday = OpeningHoursVisualization.getMonday(today);
        const nextSunday = new Date(lastMonday);
        nextSunday.setDate(nextSunday.getDate() + 7);

        if (!oh.getState() && !oh.getUnknown()) {
            // POI is currently closed
            const nextChange: Date = oh.getNextChange();
            if (
                // Shop isn't gonna open anymore in this timerange
                nextSunday < nextChange
                // And we are already in the weekend to show next week
                && (today.getDay() == 0 || today.getDay() == 6)
            ) {
                // We move the range to next week!
                lastMonday.setDate(lastMonday.getDate() + 7);
                nextSunday.setDate(nextSunday.getDate() + 7);
            }
        }


        /* We calculate the ranges when it is opened! */
        const ranges = OH.GetRanges(oh, lastMonday, nextSunday);

        /* First, a small sanity check. The business might be permanently closed, 24/7 opened or something other special
        * So, we have to handle the case that ranges is completely empty*/
        if (ranges.filter(range => range.length > 0).length === 0) {
            return OpeningHoursVisualization.ShowSpecialCase(oh).SetClass("p-4 rounded-full block bg-gray-200")
        }

        /** With all the edge cases handled, we can actually construct the table! **/

        return OpeningHoursVisualization.ConstructVizTable(oh, ranges, lastMonday)


    }

    private static ConstructVizTable(oh: any, ranges: { isOpen: boolean; isSpecial: boolean; comment: string; startDate: Date; endDate: Date }[][],
                                     rangeStart: Date): BaseUIElement {


        const isWeekstable: boolean = oh.isWeekStable();
        let [changeHours, changeHourText] = OH.allChangeMoments(ranges);
        const today = new Date();
        today.setHours(0, 0, 0, 0);

        // @ts-ignore
        const todayIndex = Math.ceil((today - rangeStart) / (1000 * 60 * 60 * 24))
        // By default, we always show the range between 8 - 19h, in order to give a stable impression
        // Ofc, a bigger range is used if needed
        const earliestOpen = Math.min(8 * 60 * 60, ...changeHours);
        let latestclose = Math.max(...changeHours);
        // We always make sure there is 30m of leeway in order to give enough room for the closing entry
        latestclose = Math.max(19 * 60 * 60, latestclose + 30 * 60)
        const availableArea = latestclose - earliestOpen;

        /*
        * The OH-visualisation is a table, consisting of 8 rows and 2 columns:
        * The first row is a header row (which is NOT passed as header but just as a normal row!) containing empty for the first column and one object giving all the end times
        * The other rows are one for each weekday: the first element showing 'mo', 'tu', ..., the second element containing the bars.
        * Note that the bars are actually an embedded <div> spanning the full width, containing multiple sub-elements
        * */

        const [header, headerHeight] = OpeningHoursVisualization.ConstructHeaderElement(availableArea, changeHours, changeHourText, earliestOpen)

        const weekdays = []
        const weekdayStyles = []
        for (let i = 0; i < 7; i++) {

            const day = OpeningHoursVisualization.weekdays[i].Clone();
            day.SetClass("w-full h-full block")

            const rangesForDay = ranges[i].map(range =>
                OpeningHoursVisualization.CreateRangeElem(availableArea, earliestOpen, latestclose, range, isWeekstable)
            )
            const allRanges = new Combine([
                ...OpeningHoursVisualization.CreateLinesAtChangeHours(changeHours, availableArea, earliestOpen) ,
                ...rangesForDay]).SetClass("w-full block");

            let extraStyle = ""
            if (todayIndex == i) {
                extraStyle = "background-color: var(--subtle-detail-color);"
                allRanges.SetClass("ohviz-today")
            } else if (i >= 5) {
                extraStyle = "background-color: rgba(230, 231, 235, 1);"
            }
            weekdays.push([day, allRanges])
            weekdayStyles.push(["padding-left: 0.5em;" + extraStyle, `position: relative;` + extraStyle])
        }
        return new Table(undefined,
            [["&nbsp", header], ...weekdays],
            [["width: 5%", `position: relative; height: ${headerHeight}`], ...weekdayStyles]
        ).SetClass("w-full")
            .SetStyle("border-collapse: collapse; word-break; word-break: normal; word-wrap: normal")


    }

    private static CreateRangeElem(availableArea: number, earliestOpen: number, latestclose: number,
                                   range: { isOpen: boolean; isSpecial: boolean; comment: string; startDate: Date; endDate: Date },
                                   isWeekstable: boolean): BaseUIElement {

        const textToShow = range.comment ?? (isWeekstable ? "" : range.startDate.toLocaleDateString());

        if (!range.isOpen && !range.isSpecial) {
            return new FixedUiElement(textToShow).SetClass("ohviz-day-off")
        }

        const startOfDay: Date = new Date(range.startDate);
        startOfDay.setHours(0, 0, 0, 0);
        // @ts-ignore
        const startpoint = (range.startDate - startOfDay) / 1000 - earliestOpen;
        // @ts-ignore
        const width = (100 * (range.endDate - range.startDate) / 1000) / (latestclose - earliestOpen);
        const startPercentage = (100 * startpoint / availableArea);
        return new FixedUiElement(textToShow).SetStyle(`left:${startPercentage}%; width:${width}%`)
            .SetClass("ohviz-range");
    }

    private static CreateLinesAtChangeHours(changeHours: number[], availableArea: number, earliestOpen: number):
        BaseUIElement[] {

        const allLines: BaseUIElement[] = []
        for (const changeMoment of changeHours) {
            const offset = 100 * (changeMoment - earliestOpen) / availableArea;
            if (offset < 0 || offset > 100) {
                continue;
            }
            const el = new FixedUiElement("").SetStyle(`left:${offset}%;`).SetClass("ohviz-line");
            allLines.push(el);
        }
        return allLines;
    }


    /**
     * The OH-Visualization header element, a single bar with hours
     * @param availableArea
     * @param changeHours
     * @param changeHourText
     * @param earliestOpen
     * @constructor
     * @private
     */
    private static ConstructHeaderElement(availableArea: number, changeHours: number[], changeHourText: string[], earliestOpen: number)
        : [BaseUIElement, string] {
        let header: BaseUIElement[] = [];

        header.push(...OpeningHoursVisualization.CreateLinesAtChangeHours(changeHours, availableArea, earliestOpen))

        let showHigher = false;
        let showHigherUsed = false;
        for (let i = 0; i < changeHours.length; i++) {
            let changeMoment = changeHours[i];
            const offset = 100 * (changeMoment - earliestOpen) / availableArea;
            if (offset < 0 || offset > 100) {
                continue;
            }

            if (i > 0 && ((changeMoment - changeHours[i - 1]) / (60*60)) < 2) {
                // Quite close to the previous value
                // We alternate the heights
                showHigherUsed = true;
                showHigher = !showHigher;
            } else {
                showHigher = false;
            }

            const el = new Combine([

                new FixedUiElement(changeHourText[i])
                    .SetClass("relative bg-white pl-1 pr-1 h-3 font-sm rounded-xl border-2 border-black  border-opacity-50")
                    .SetStyle("left: -50%; word-break:initial")

            ])
                .SetStyle(`left:${offset}%;margin-top: ${showHigher ? '1.4rem;' : "0.1rem"}`)
                .SetClass("block absolute top-0 m-0 h-full box-border ohviz-time-indication");
            header.push(el);
        }
        const headerElem = new Combine(header).SetClass(`w-full absolute block ${showHigherUsed ? "h-16" : "h-8"}`)
            .SetStyle("margin-top: -1rem")
        const headerHeight = showHigherUsed ? "4rem" : "2rem";
        return [headerElem, headerHeight]

    }

    /*
    * Visualizes any special case: e.g. not open for a long time, 24/7 open, ...
    * */
    private static ShowSpecialCase(oh: any) {
        const opensAtDate = oh.getNextChange();
        if (opensAtDate === undefined) {
            const comm = oh.getComment() ?? oh.getUnknown();
            if (!!comm) {
                return new FixedUiElement(comm)
            }

            if (oh.getState()) {
                return Translations.t.general.opening_hours.open_24_7.Clone()
            }
            return Translations.t.general.opening_hours.closed_permanently.Clone()
        }
        const willOpenAt = `${opensAtDate.getDate()}/${opensAtDate.getMonth() + 1} ${OH.hhmm(opensAtDate.getHours(), opensAtDate.getMinutes())}`
        return Translations.t.general.opening_hours.closed_until.Subs({date: willOpenAt})
    }

    private static getMonday(d) {
        d = new Date(d);
        const day = d.getDay();
        const diff = d.getDate() - day + (day == 0 ? -6 : 1); // adjust when day is sunday
        return new Date(d.setDate(diff));
    }

}