import { createEffect, For, JSX, ParentComponent, useContext, Show, VoidComponent } from 'solid-js';
import { lazily } from 'solidjs-lazily';
import { createScrollPosition } from "@solid-primitives/scroll";

import { Stop } from '../types';
import { PositionedPanel } from '../utils';

import { BusinessDataContext, BusinessDataStore } from "../businessData";
import { SearchContext, SearchProvider, SearchStore } from "./searchStore";
import { StopsPanel } from "./stopPanel";

const { Map } = lazily(() => import("./map"));


import "./stopsSearchMenu.scss";


const StopNameInput: VoidComponent<{ onInput: JSX.EventHandler<HTMLInputElement, InputEvent>, leftAddon: string, placeholder: string }> = (props) => {
    return <div class="stopNameInput">
        <div class="leftAddon">{props.leftAddon}</div>
        <input type="text" oninput={props.onInput} placeholder={props.placeholder} />
    </div>;
};


const Header: VoidComponent<{ title: string, minCharsNb: number }> = (props) => {
    const businessDataStore: BusinessDataStore | undefined = useContext(BusinessDataContext);
    const searchStore: SearchStore | undefined = useContext(SearchContext);

    if (businessDataStore === undefined || searchStore === undefined)
        return <div />;

    const { setSearchText } = searchStore;

    const onStopNameInput: JSX.EventHandler<HTMLInputElement, InputEvent> = async (event): Promise<void> => {
        const stopName = event.currentTarget.value;
        if (stopName.length >= props.minCharsNb) {
            await setSearchText(stopName, businessDataStore);
        }
    }

    return <div class="header">
        <div class="title">
            <svg viewBox="0 0 1260 50">
                <text x="0" y="50%" dominant-baseline="middle" font-size="50" style="fill: #ffffff">
                    {props.title}
                </text>
            </svg>
        </div>
        <StopNameInput onInput={onStopNameInput} leftAddon="🚉 🚏" placeholder="Stop name..." />
    </div>;
};


const StopsPanels: ParentComponent<{ maxStopsPerPanel: number }> = (props) => {
    const searchStore: SearchStore | undefined = useContext(SearchContext);

    if (searchStore === undefined) {
        return <div />;
    }

    const { getDisplayedPanelId, getFoundStops, getPanels, setDisplayedPanelId, setPanels } = searchStore;
    let stopsPanelsRef: HTMLDivElement | undefined = undefined
    const stopsPanelsScroll = createScrollPosition(() => stopsPanelsRef);
    const yStopsPanelsScroll = () => stopsPanelsScroll.y;

    createEffect(() => {
        yStopsPanelsScroll();

        for (const panel of getPanels()) {
            const panelDiv = panel.panel;
            if (panelDiv != null) {
                const panelDivClientRect = panelDiv.getBoundingClientRect();
                if (panelDivClientRect.y > 0) {
                    setDisplayedPanelId(panel.position);
                    break;
                }
            }
        }
    });

    return (
        <div ref={stopsPanelsRef} class="stopsPanels">
            {() => {
                setPanels([]);

                let newPanels = [];
                let positioneds: PositionedPanel[] = [];

                let stops: Stop[] = [];

                for (const stop of getFoundStops()) {
                    if (stops.length < props.maxStopsPerPanel) {
                        stops.push(stop);
                    }
                    else {
                        const panelId = newPanels.length;
                        const panel = <StopsPanel stops={stops} show={panelId == getDisplayedPanelId()} />;
                        newPanels.push(panel);
                        positioneds.push({ position: panelId, panel: panel });
                        stops = [stop];
                    }
                }
                if (stops.length) {
                    const panelId = newPanels.length;
                    const panel = <StopsPanel stops={stops} show={panelId == getDisplayedPanelId()} />;
                    newPanels.push(panel);
                    positioneds.push({ position: panelId, panel: panel });
                }

                setPanels(positioneds);

                return newPanels;
            }}
        </div>
    );
};


const MapPlaceholder: VoidComponent<{}> = () => {
    const searchStore: SearchStore | undefined = useContext(SearchContext);

    if (searchStore === undefined) {
        return <div />;
    }

    const { enableMap } = searchStore;

    const onDoubleClick = (): void => {
        console.log('!!! ON DOUBLE CLICK');
        enableMap(true);
    }

    return <div
        class="mapPlaceholder"
        ondblclick={() => onDoubleClick()}>
        Double-clic pour activer la carte
    </div>;
};


const Body: VoidComponent<{}> = () => {
    const searchStore: SearchStore | undefined = useContext(SearchContext);
    if (searchStore === undefined) {
        return <div />;
    }

    const { isMapEnabled } = searchStore;

    const maxStopsPerPanel = 5;

    return <div class="body">
        <StopsPanels maxStopsPerPanel={maxStopsPerPanel} />
        <Show when={isMapEnabled()} fallback={<MapPlaceholder />}>
            <Map />
        </Show>
    </div>;
};


const Footer: VoidComponent<{}> = () => {
    const searchStore: SearchStore | undefined = useContext(SearchContext);
    if (searchStore === undefined) {
        return <div />;
    }

    const { getDisplayedPanelId, getPanels } = searchStore;

    return <div class="footer">
        <For each={getPanels()}>
            {(panel) => {
                const position = panel.position;
                return (
                    <div>
                        <svg viewBox="0 0 29 29">
                            <circle
                                cx="50%" cy="50%" r="13" stroke="#ffffff" stroke-width="3"
                                style={{ fill: `var(--idfm-${position == getDisplayedPanelId() ? "white" : "black"})` }}
                            />
                        </svg>
                    </div>
                );
            }}</For>
    </div>;
};


export const StopsSearchMenu: VoidComponent = () => {
    return <div class="stopSearchMenu">
        <SearchProvider>
            <Header title="Recherche de l'arrêt..." minCharsNb={4} />
            <Body />
            <Footer />
        </SearchProvider>
    </div>;
};