import { Room } from "./room.class";

export class App {
    static floorLabels = [
        'Ground floor',
        '1st floor',
        '2nd floor',
        '3rd floor',
        '4th floor',
        '5th floor',
        '6th floor',
    ];
    static removeClasses = ['active', 'lower', 'raise', 'hilite'];

    private rooms: Array<Room> = [];

    private roomsDataListElement: HTMLDataListElement;
    private floorSelectElement: HTMLSelectElement;
    private filterElement: HTMLInputElement;
    private labelElement: HTMLHeadingElement;
    private svgElements: Array<SVGSVGElement>;
    private svgRooms: Array<Element>;

    constructor(params: {rooms: Array<Room>}) {
        this.rooms = params.rooms;

        this.roomsDataListElement = <HTMLDataListElement>document.getElementById('roomList');
        this.floorSelectElement   = <HTMLSelectElement>document.getElementById('floorSelect');
        this.filterElement        = <HTMLInputElement>document.getElementById('filter');
        this.labelElement         = <HTMLHeadingElement>document.getElementById('label');

        const mapContainer = <HTMLElement>document.getElementById('map-container');
        this.svgElements = Array.from(mapContainer.getElementsByTagName('svg'));
        this.svgRooms = Array.from(mapContainer.getElementsByClassName('room'));
    }

    run() {
        // init floor selector and input datalist
        this.initFloorSelect(App.floorLabels)
            .populateDataList();

        // add event listeners for restoring application state
        document.addEventListener('DOMContentLoaded', () => {
            const hash = (<Location>document.location).hash;
            return hash ? this.restoreState(hash.split('.')) : null;
        });
        window.addEventListener('popstate', event => this.restoreState(event.state));

        // what happens when the floor selector is changed
        this.floorSelectElement.addEventListener('change', event => this.applyFloorFilter(+(<HTMLInputElement>event.target).value));

        // what happens when the room filter is changed
        this.filterElement.addEventListener('change', event => {
            const room = this.rooms.find(room => room.name.toLocaleLowerCase() === this.filterElement.value.toLocaleLowerCase());
            this.selectFloor(room ? room.floor : 7).deselectAllRooms();
            if (room) this.selectRoom(room.id).pushRoomState(room);
        });

        // what should happen when a floor is clicked on
        this.svgElements.map(svg => svg.addEventListener('click', event => {
            event.stopPropagation();
            const svgRoom = this.svgRooms.find(svgRoom => svgRoom.classList.contains('hilite'));
            if (svgRoom) this.setFloorLabel((<Room>this.rooms.find(room => room.id == svgRoom.id)).floor);
            this.deselectAllRooms();
        }));

        // what should happen when a room is clicked on
        this.svgRooms.map(svgRoom => svgRoom.addEventListener('click', event => {
            event.stopPropagation();
            const room = <Room>this.rooms.find(room => room.id === svgRoom.id);
            if ((<HTMLElement>event.target).classList.contains('hilite')) {
                this.deselectAllRooms().setFloorLabel(room.floor);
            } else {
                this.deselectAllRooms().selectRoom(room.id).pushRoomState(room);
            }
        }));

        // add roomname as title to all rooms when user hovers mouse over the room
        this.rooms.map(room => {
            const titleElement = document.createElementNS("http://www.w3.org/2000/svg", "title");
            titleElement.textContent = `${room.name}`;
            const svgRoom = <HTMLElement>document.getElementById(room.id);
            svgRoom.appendChild(titleElement);
            svgRoom.classList.add(...Room.typeClassMap[room.type]);
        });
    }

    genFloorHash(idx: number): string {
        return `#f.${idx}`;
    }

    genRoomHash(room: Room): string {
        return `#r.${room.floor}.${room.id}`;
    }

    initFloorSelect(labels: Array<string>): App {
        labels.map((floor, idx) => this.floorSelectElement.appendChild(new Option(floor, idx.toLocaleString())));
        return this;
    }

    populateDataList(floor: number = -1): App {
        this.rooms.filter(room => floor == -1 ? true : room.floor == floor)
            .map(room => room.name).sort()
            .map(roomName => this.roomsDataListElement.appendChild(new Option(roomName)));
        return this;
    }

    clearDataList(): App {
        while(this.roomsDataListElement.lastChild) {
            this.roomsDataListElement.removeChild(this.roomsDataListElement.lastChild);
        }
        return this;
    }

    setLabel(label: string): App {
        this.labelElement.innerHTML = label;
        return this;
    }

    setFloorLabel(idx: number): App {
        this.setLabel(App.floorLabels[idx]);
        return this;
    }

    setRoomLabel(room: Room): App {
        this.setLabel(`${App.floorLabels[room.floor]} - ${room.formattedName}`);
        return this;
    }

    selectFloor(idx: number): App {
        this.svgElements.map((svg, svgidx) => {
            svg.classList.remove(...App.removeClasses);
            svg.classList.add(idx == svgidx ? 'active' : (
                svgidx > idx ? 'raise' : 'lower'
            ));
        });
        return this;
    }

    selectRoom(id: string): App {
        const room = <Room>this.rooms.find(room => room.id === id);
        this.setRoomLabel(room).filterElement.value = room.name;
        (<HTMLElement>document.getElementById(id)).classList.add('hilite');
        Array.from(document.getElementsByClassName(`floor-${room.floor}`))
            .filter(floor => !floor.classList.contains('hilite'))
            .map(floor => floor.classList.add('hilite'));
        return this;
    }

    deselectAllRooms(): App {
        this.svgElements.map(svg => svg.classList.remove('hilite'));
        this.svgRooms.map(room => room.classList.remove('hilite'));
        return this;
    }

    applyFloorFilter(idx: number): App {
        this.filterElement.value = '';
        this.deselectAllRooms().clearDataList().populateDataList(idx);
        if (idx == -1) {
            this.setLabel('').svgElements
                .map(svg => svg.classList.remove(...App.removeClasses));
            return this;
        }
        return this.setFloorLabel(idx).selectFloor(idx).pushFloorState(idx);
    }

    pushState(state: {}, title: string, url: string): App {
        window.history.pushState(state, title, url);
        return this;
    }

    pushFloorState(idx: number): App {
        return this.pushState(
            ['#f', idx],
            `ETH map - ${App.floorLabels[idx]}`,
            this.genFloorHash(idx)
        );
    }

    pushRoomState(room: Room): App {
        return this.pushState(
            ['#r', room.floor, room.id],
            `ETH map - ${App.floorLabels[room.floor]} / ${room.formattedName}`,
            this.genRoomHash(room)
        );
    }

    restoreState(params: Array<any>): App {
        const [cmd,floor,roomId] = [...params];
        this.deselectAllRooms();
        switch(cmd) {
            case '#r':
                this.selectFloor(floor).selectRoom(roomId);
                break;
            case '#f':
                this.selectFloor(floor);
                break;
        }
        return this;
    }
}