import { type TimeGranularity, granHelper } from '../../utils';
import { Ele as NumListEle, type EventMap as NumListEvent } from '../num-list';
import { type BaseAttrs, type BaseEmits, UiBase } from '../web-component-base';
import { baseCss } from './css';
import { baseHtml } from './html';

export const granularityList = granHelper.time.list;
export type Granularity = TimeGranularity;

export const colOrderList = ['hms', 'hsm', 'mhs', 'msh', 'shm', 'smh'] as const;
export type ColOrder = (typeof colOrderList)[number] & {
    [Symbol.iterator](): IterableIterator<'h' | 'm' | 's'>;
};

export interface Attrs extends BaseAttrs {
    millisecond: number;
    // 'max-millisecond'?: number;
    // 'min-millisecond'?: number;
    /**
     * 选择器的粒度，表示最大可选的时间单位。默认为 hour。
     * 例如设置为 'minute'，则表示最大只能选择到分钟，小时将被忽略。
     */
    'max-granularity'?: Granularity;
    /**
     * 选择器的粒度，表示最小可选的时间单位。默认为 millisecond。
     * 例如设置为 'minute'，则表示只能选择到分钟，秒和毫秒将被忽略。
     */
    'min-granularity'?: Granularity;
    'col-order'?: ColOrder;
}

export type { BaseEmits };

/** 时分秒毫秒选择器 */
export class BaseEle<A extends Attrs, E extends BaseEmits> extends UiBase<
    A,
    E
> {
    protected static _style = baseCss;
    protected static _template = baseHtml;
    static get observedAttributes(): string[] {
        return [
            ...(super.observedAttributes as (keyof BaseAttrs)[]),
            'millisecond',
            'max-granularity',
            'min-granularity',
            'col-order'
        ] satisfies (keyof Attrs)[];
    }

    get _staticEls() {
        return {
            ...super._staticEls,
            cols: this.$0`.cols`!,
            hCol: this.$0`.col.hour`!,
            mCol: this.$0`.col.minute`!,
            sCol: this.$0`.col.second`!,
            lists: this.$<NumListEle>`dt-num-list`!,
            hList: this.$0<NumListEle>`dt-num-list.hour`!,
            mList: this.$0<NumListEle>`dt-num-list.minute`!,
            sList: this.$0<NumListEle>`dt-num-list.second`!,
            msWrapper: this.$0`[part="ms-wrapper"]`!,
            msInput: this.$0<HTMLInputElement>`input#ms`!
        } as const;
    }

    /** 当前时间的毫秒数，范围为一天内的毫秒数（0 到 86399999），随着用户选择时实时更新 */
    public get millisecond() {
        const v = Math.floor(+this._getAttr('millisecond', '0'));
        return Math.min(Math.max(0, v), 24 * 60 * 60 * 1000 - 1);
    }
    public set millisecond(v: number) {
        v = Math.min(Math.max(0, Math.floor(v)), 24 * 60 * 60 * 1000 - 1);
        this.setAttribute('millisecond', '' + v);
    }
    public get maxGranularity() {
        return this._getAttr('max-granularity', 'hour') as Granularity;
    }
    public set maxGranularity(v: Granularity) {
        if (!granHelper.time.has(v)) return;
        this.setAttribute('max-granularity', v);
    }
    public get minGranularity() {
        return this._getAttr('min-granularity', 'millisecond') as Granularity;
    }
    public set minGranularity(v: Granularity) {
        if (!granHelper.time.has(v)) return;
        this.setAttribute('min-granularity', v);
    }
    public get colOrder() {
        return this._getAttr('col-order', 'smh') as ColOrder;
    }
    public set colOrder(v: ColOrder) {
        if (!colOrderList.includes(v)) return;
        this.setAttribute('col-order', v);
    }

    protected get _minmaxGran() {
        const [min, max] = granHelper.time.minmax(
            this.minGranularity,
            this.maxGranularity
        );
        return { min, max };
    }

    public scrollToCurrentItem() {
        this._els.lists.forEach((e) => e.scrollToCurrent());
    }

    public connectedCallback(): boolean | void {
        if (!super.connectedCallback()) return;
        const { _els } = this;
        _els.lists.forEach(
            (e) => (e.formatter = (i) => (i < 10 ? '0' : '') + i)
        );

        this._renderCols();
        this._updateGranularity();
        this._updateColsValue();

        this._bindEvt(_els.lists)('select-num', this._onColsSelect);
        this._bindEvt(_els.msInput)('input', this._onMsInput);
        return true;
    }

    protected _onAttrChanged(
        name: string,
        oldValue: string | null,
        newValue: string | null
    ) {
        super._onAttrChanged(name, oldValue, newValue);
        if (name === 'max-granularity' || name === 'min-granularity')
            this._updateGranularity();
        else if (name === 'col-order') this._renderCols();
        else if (name === 'millisecond') this._updateColsValue();
    }

    private _renderCols = super._genRenderFn(() => {
        const { _els } = this;
        for (const c of this.colOrder) {
            _els[`${c}Col`].remove();
            _els.cols.appendChild(_els[`${c}Col`]);
        }
    });

    private _updateGranularity = super._genRenderFn(() => {
        const { _minmaxGran, _els } = this;
        const [maxG, minG] = granHelper.time.idx(
            _minmaxGran.max,
            _minmaxGran.min
        );
        const show = (el: HTMLElement, condition: boolean) =>
            !(el.style.display = condition ? '' : 'none');
        show(
            _els.cols,
            [
                show(_els.hCol, maxG >= 3 && minG <= 3),
                show(_els.mCol, maxG >= 2 && minG <= 2),
                show(_els.sCol, maxG >= 1 && minG <= 1)
            ].some((v) => v)
        );
        show(_els.msWrapper, maxG >= 0 && minG <= 0);
    });

    private _updateColsValue = super._genRenderFn(() => {
        const { millisecond, _els } = this;

        // set column values
        const hour = Math.floor(millisecond / (60 * 60 * 1000));
        const minute = Math.floor(
            (millisecond % (60 * 60 * 1000)) / (60 * 1000)
        );
        const second = Math.floor((millisecond % (60 * 1000)) / 1000);
        const ms = millisecond % 1000;
        _els.hList.currentNum = hour;
        _els.mList.currentNum = minute;
        _els.sList.currentNum = second;
        _els.msInput.value = ('000' + ms).slice(-3);
    });

    private _getMsFromEle() {
        const { _els } = this;
        const hour = _els.hList.currentNum;
        const minute = _els.mList.currentNum;
        const second = _els.sList.currentNum;
        const ms = Math.min(Math.max(0, +_els.msInput.value || 0), 999);
        return ((hour * 60 + minute) * 60 + second) * 1000 + ms;
    }
    private _onMsInput = (e: Event) => {
        if (!(e.target instanceof HTMLInputElement)) return;
        let v = +e.target.value;
        if (Number.isNaN(v)) v = 0;
        v = Math.min(Math.max(0, Math.floor(v)), 999);
        e.target.value = ('000' + v).slice(-3);
        this.millisecond = this._getMsFromEle();
    };
    private _onColsSelect = (e: NumListEvent['select-num']) => {
        if (!(e.target instanceof NumListEle)) return;
        e.stopPropagation();
        e.target.currentNum = e.detail.newNum;
        this.millisecond = this._getMsFromEle();
    };
}