/**
 * This is the base-table which is selectable by hovering over it.
 * It will genarate the currently selected opening hour.
 */
import {UIEventSource} from "../../Logic/UIEventSource";
import {Utils} from "../../Utils";
import {OpeningHour} from "./OpeningHours";
import {InputElement} from "../Input/InputElement";
import Translations from "../i18n/Translations";
import {Translation} from "../i18n/Translation";
import {FixedUiElement} from "../Base/FixedUiElement";
import {VariableUiElement} from "../Base/VariableUIElement";
import Combine from "../Base/Combine";
import OpeningHoursRange from "./OpeningHoursRange";

export default class OpeningHoursPickerTable extends InputElement<OpeningHour[]> {
    public static readonly days: 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
        ]
    /*
    These html-elements are an overlay over the table columns and act as a host for the ranges in the weekdays
     */
    public readonly weekdayElements: HTMLElement[] = Utils.TimesT(7, () => document.createElement("div"))
    private readonly source: UIEventSource<OpeningHour[]>;

    constructor(source?: UIEventSource<OpeningHour[]>) {
        super();
        this.source = source ?? new UIEventSource<OpeningHour[]>([]);
        this.SetStyle("width:100%;height:100%;display:block;");
    }

    IsValid(t: OpeningHour[]): boolean {
        return true;
    }

    GetValue(): UIEventSource<OpeningHour[]> {
        return this.source;
    }

    protected InnerConstructElement(): HTMLElement {

        const table = document.createElement("table")
        table.classList.add("oh-table")

        const cellHeightInPx = 14;

        const headerRow = document.createElement("tr")
        headerRow.appendChild(document.createElement("th"))
        headerRow.classList.add("relative")
        for (let i = 0; i < OpeningHoursPickerTable.days.length; i++) {
            let weekday = OpeningHoursPickerTable.days[i].Clone();
            const cell = document.createElement("th")
            cell.style.width = "14%"
            cell.appendChild(weekday.ConstructElement())

            const fullColumnSpan = this.weekdayElements[i]
            fullColumnSpan.classList.add("w-full", "relative")

            // We need to round! The table height is rounded as following, we use this to calculate the actual number of pixels afterwards
            fullColumnSpan.style.height = ((cellHeightInPx) * 48) + "px"


            const ranges = new VariableUiElement(
                this.source.map(ohs => ohs.filter((oh: OpeningHour) => oh.weekday === i))
                    .map(ohsForToday => {
                        return new Combine(ohsForToday.map(oh => new OpeningHoursRange(oh, () => {
                            this.source.data.splice(this.source.data.indexOf(oh), 1)
                            this.source.ping()
                        })))
                    })
            )
            fullColumnSpan.appendChild(ranges.ConstructElement())


            const fullColumnSpanWrapper = document.createElement("div")
            fullColumnSpanWrapper.classList.add("absolute")
            fullColumnSpanWrapper.style.zIndex = "10"
            fullColumnSpanWrapper.style.width = "13.5%"
            fullColumnSpanWrapper.style.pointerEvents = "none"

            fullColumnSpanWrapper.appendChild(fullColumnSpan)

            cell.appendChild(fullColumnSpanWrapper)
            headerRow.appendChild(cell)
        }

        table.appendChild(headerRow)

        const self = this;
        for (let h = 0; h < 24; h++) {

            const hs = Utils.TwoDigits(h);
            const firstCell = document.createElement("td")
            firstCell.rowSpan = 2
            firstCell.classList.add("oh-left-col", "oh-timecell-full", "border-box")
            firstCell.appendChild(new FixedUiElement(hs + ":00").ConstructElement())

            const evenRow = document.createElement("tr")
            evenRow.appendChild(firstCell);

            for (let weekday = 0; weekday < 7; weekday++) {
                const cell = document.createElement("td")
                cell.classList.add("oh-timecell", "oh-timecell-full", `oh-timecell-${weekday}`)
                evenRow.appendChild(cell)
            }
            evenRow.style.height = (cellHeightInPx) + "px";
            evenRow.style.maxHeight = evenRow.style.height;
            evenRow.style.minHeight = evenRow.style.height;
            table.appendChild(evenRow)

            const oddRow = document.createElement("tr")

            for (let weekday = 0; weekday < 7; weekday++) {
                const cell = document.createElement("td")
                cell.classList.add("oh-timecell", "oh-timecell-half", `oh-timecell-${weekday}`)
                oddRow.appendChild(cell)
            }
            oddRow.style.minHeight = evenRow.style.height;
            oddRow.style.maxHeight = evenRow.style.height;

            table.appendChild(oddRow)
        }


        /**** Event handling below ***/


        let mouseIsDown = false;
        let selectionStart: [number, number] = undefined;
        let selectionEnd: [number, number] = undefined;

        function h(timeSegment: number) {
            return Math.floor(timeSegment / 2);
        }

        function m(timeSegment: number) {
            return (timeSegment % 2) * 30;
        }

        function startSelection(i: number, j: number) {
            mouseIsDown = true;
            selectionStart = [i, j];
            selectionEnd = [i, j];
        }

        function endSelection() {
            if (selectionStart === undefined) {
                return;
            }
            if (!mouseIsDown) {
                return;
            }
            mouseIsDown = false
            const dStart = Math.min(selectionStart[1], selectionEnd[1]);
            const dEnd = Math.max(selectionStart[1], selectionEnd[1]);
            const timeStart = Math.min(selectionStart[0], selectionEnd[0]) - 1;
            const timeEnd = Math.max(selectionStart[0], selectionEnd[0]) - 1;
            for (let weekday = dStart; weekday <= dEnd; weekday++) {
                const oh: OpeningHour = {
                    weekday: weekday,
                    startHour: h(timeStart),
                    startMinutes: m(timeStart),
                    endHour: h(timeEnd + 1),
                    endMinutes: m(timeEnd + 1)
                }
                if (oh.endHour > 23) {
                    oh.endHour = 24;
                    oh.endMinutes = 0;
                }
                self.source.data.push(oh);
            }
            self.source.ping();

            // Clear the highlighting
            let header = table.rows[0];
            for (let j = 1; j < header.cells.length; j++) {
                header.cells[j].classList?.remove("oh-timecol-selected")
            }
            for (let i = 1; i < table.rows.length; i++) {
                let row = table.rows[i]
                for (let j = 0; j < row.cells.length; j++) {
                    let cell = row.cells[j]
                    cell?.classList?.remove("oh-timecell-selected");
                    row.classList?.remove("oh-timerow-selected");
                }
            }
        }

        table.onmouseup = () => {
            endSelection();
        };
        table.onmouseleave = () => {
            endSelection();
        };

        let lastSelectionIend, lastSelectionJEnd;

        function selectAllBetween(iEnd, jEnd) {

            if (lastSelectionIend === iEnd && lastSelectionJEnd === jEnd) {
                return; // We already did this
            }
            lastSelectionIend = iEnd;
            lastSelectionJEnd = jEnd;

            let iStart = selectionStart[0];
            let jStart = selectionStart[1];

            if (iStart > iEnd) {
                const h = iStart;
                iStart = iEnd;
                iEnd = h;
            }
            if (jStart > jEnd) {
                const h = jStart;
                jStart = jEnd;
                jEnd = h;
            }

            let header = table.rows[0];
            for (let j = 1; j < header.cells.length; j++) {
                let cell = header.cells[j]
                cell.classList?.remove("oh-timecol-selected-round-left");
                cell.classList?.remove("oh-timecol-selected-round-right");

                if (jStart + 1 <= j && j <= jEnd + 1) {
                    cell.classList?.add("oh-timecol-selected")
                    if (jStart + 1 == j) {
                        cell.classList?.add("oh-timecol-selected-round-left");
                    }
                    if (jEnd + 1 == j) {
                        cell.classList?.add("oh-timecol-selected-round-right");
                    }

                } else {
                    cell.classList?.remove("oh-timecol-selected")
                }
            }


            for (let i = 1; i < table.rows.length; i++) {
                let row = table.rows[i];
                if (iStart <= i && i <= iEnd) {
                    row.classList?.add("oh-timerow-selected")
                } else {
                    row.classList?.remove("oh-timerow-selected")
                }
                for (let j = 0; j < row.cells.length; j++) {
                    let cell = row.cells[j]
                    if (cell === undefined) {
                        continue;
                    }
                    let offset = 0;
                    if (i % 2 == 1) {
                        if (j == 0) {
                            // This is the first column of a full hour -> This is the time indication (skip)
                            continue;
                        }
                        offset = -1;
                    }


                    if (iStart <= i && i <= iEnd &&
                        jStart <= j + offset && j + offset <= jEnd) {
                        cell?.classList?.add("oh-timecell-selected")
                    } else {
                        cell?.classList?.remove("oh-timecell-selected")
                    }


                }

            }
        }

        for (let i = 1; i < table.rows.length; i++) {
            let row = table.rows[i]
            for (let j = 0; j < row.cells.length; j++) {
                let cell = row.cells[j]
                let offset = 0;
                if (i % 2 == 1) {
                    if (j == 0) {
                        continue;
                    }
                    offset = -1;
                }


                cell.onmousedown = (ev) => {
                    ev.preventDefault();
                    startSelection(i, j + offset)
                    selectAllBetween(i, j + offset);
                }
                cell.ontouchstart = (ev) => {
                    ev.preventDefault();
                    startSelection(i, j + offset);
                    selectAllBetween(i, j + offset);
                }
                cell.onmouseenter = () => {
                    if (mouseIsDown) {
                        selectionEnd = [i, j + offset];
                        selectAllBetween(i, j + offset)
                    }
                }


                cell.ontouchmove = (ev: TouchEvent) => {

                    ev.preventDefault();
                    for (const k in ev.targetTouches) {
                        const touch = ev.targetTouches[k];
                        if (touch.clientX === undefined || touch.clientY === undefined) {
                            continue;
                        }
                        const elUnderTouch = document.elementFromPoint(
                            touch.clientX,
                            touch.clientY
                        );
                        // @ts-ignore
                        const f = elUnderTouch.onmouseenter;
                        if (f) {
                            f();
                        }
                    }

                }

                cell.ontouchend = (ev) => {
                    ev.preventDefault();
                    endSelection();
                }
            }

        }

        return table
    }

}