import { VantComponent } from '../common/component';
import { ROW_HEIGHT, getPrevDay, getNextDay, getToday, compareDay, copyDates, calcDateNum, formatMonthTitle, compareMonth, getMonths, getDayByOffset, } from './utils';
import Toast from '../toast/toast';
import { requestAnimationFrame } from '../common/utils';
const initialMinDate = getToday().getTime();
const initialMaxDate = (() => {
    const now = getToday();
    return new Date(now.getFullYear(), now.getMonth() + 6, now.getDate()).getTime();
})();
const getTime = (date) => date instanceof Date ? date.getTime() : date;
VantComponent({
    props: {
        title: {
            type: String,
            value: '日期选择',
        },
        color: String,
        show: {
            type: Boolean,
            observer(val) {
                if (val) {
                    this.initRect();
                    this.scrollIntoView();
                }
            },
        },
        formatter: null,
        confirmText: {
            type: String,
            value: '确定',
        },
        confirmDisabledText: {
            type: String,
            value: '确定',
        },
        rangePrompt: String,
        showRangePrompt: {
            type: Boolean,
            value: true,
        },
        defaultDate: {
            type: null,
            observer(val) {
                this.setData({ currentDate: val });
                this.scrollIntoView();
            },
        },
        allowSameDay: Boolean,
        type: {
            type: String,
            value: 'single',
            observer: 'reset',
        },
        minDate: {
            type: Number,
            value: initialMinDate,
        },
        maxDate: {
            type: Number,
            value: initialMaxDate,
        },
        position: {
            type: String,
            value: 'bottom',
        },
        rowHeight: {
            type: null,
            value: ROW_HEIGHT,
        },
        round: {
            type: Boolean,
            value: true,
        },
        poppable: {
            type: Boolean,
            value: true,
        },
        showMark: {
            type: Boolean,
            value: true,
        },
        showTitle: {
            type: Boolean,
            value: true,
        },
        showConfirm: {
            type: Boolean,
            value: true,
        },
        showSubtitle: {
            type: Boolean,
            value: true,
        },
        safeAreaInsetBottom: {
            type: Boolean,
            value: true,
        },
        closeOnClickOverlay: {
            type: Boolean,
            value: true,
        },
        maxRange: {
            type: null,
            value: null,
        },
        minRange: {
            type: Number,
            value: 1,
        },
        firstDayOfWeek: {
            type: Number,
            value: 0,
        },
        readonly: Boolean,
    },
    data: {
        subtitle: '',
        currentDate: null,
        scrollIntoView: '',
    },
    created() {
        this.setData({
            currentDate: this.getInitialDate(this.data.defaultDate),
        });
    },
    mounted() {
        if (this.data.show || !this.data.poppable) {
            this.initRect();
            this.scrollIntoView();
        }
    },
    methods: {
        reset() {
            this.setData({ currentDate: this.getInitialDate() });
            this.scrollIntoView();
        },
        initRect() {
            if (this.contentObserver != null) {
                this.contentObserver.disconnect();
            }
            const contentObserver = this.createIntersectionObserver({
                thresholds: [0, 0.1, 0.9, 1],
                observeAll: true,
            });
            this.contentObserver = contentObserver;
            contentObserver.relativeTo('.van-calendar__body');
            contentObserver.observe('.month', (res) => {
                if (res.boundingClientRect.top <= res.relativeRect.top) {
                    // @ts-ignore
                    this.setData({ subtitle: formatMonthTitle(res.dataset.date) });
                }
            });
        },
        limitDateRange(date, minDate = null, maxDate = null) {
            minDate = minDate || this.data.minDate;
            maxDate = maxDate || this.data.maxDate;
            if (compareDay(date, minDate) === -1) {
                return minDate;
            }
            if (compareDay(date, maxDate) === 1) {
                return maxDate;
            }
            return date;
        },
        getInitialDate(defaultDate = null) {
            const { type, minDate, maxDate, allowSameDay } = this.data;
            const now = getToday().getTime();
            if (type === 'range') {
                if (!Array.isArray(defaultDate)) {
                    defaultDate = [];
                }
                const [startDay, endDay] = defaultDate || [];
                const start = this.limitDateRange(startDay || now, minDate, getPrevDay(new Date(maxDate)).getTime());
                const date = getTime(endDay || now);
                const end = this.limitDateRange(date, allowSameDay ? date : getNextDay(new Date(minDate)).getTime());
                return [start, end];
            }
            if (type === 'multiple') {
                if (Array.isArray(defaultDate)) {
                    return defaultDate.map((date) => this.limitDateRange(date));
                }
                return [this.limitDateRange(now)];
            }
            if (!defaultDate || Array.isArray(defaultDate)) {
                defaultDate = now;
            }
            return this.limitDateRange(defaultDate);
        },
        scrollIntoView() {
            requestAnimationFrame(() => {
                const { currentDate, type, show, poppable, minDate, maxDate } = this.data;
                // @ts-ignore
                const targetDate = type === 'single' ? currentDate : currentDate[0];
                const displayed = show || !poppable;
                if (!targetDate || !displayed) {
                    return;
                }
                const months = getMonths(minDate, maxDate);
                months.some((month, index) => {
                    if (compareMonth(month, targetDate) === 0) {
                        this.setData({ scrollIntoView: `month${index}` });
                        return true;
                    }
                    return false;
                });
            });
        },
        onOpen() {
            this.$emit('open');
        },
        onOpened() {
            this.$emit('opened');
        },
        onClose() {
            this.$emit('close');
        },
        onClosed() {
            this.$emit('closed');
        },
        onClickDay(event) {
            if (this.data.readonly) {
                return;
            }
            let { date } = event.detail;
            const { type, currentDate, allowSameDay } = this.data;
            if (type === 'range') {
                // @ts-ignore
                const [startDay, endDay] = currentDate;
                if (startDay && !endDay) {
                    const compareToStart = compareDay(date, startDay);
                    if (compareToStart === 1) {
                        const { days } = this.selectComponent('.month').data;
                        days.some((day, index) => {
                            const isDisabled = day.type === 'disabled' &&
                                getTime(startDay) < getTime(day.date) &&
                                getTime(day.date) < getTime(date);
                            if (isDisabled) {
                                ({ date } = days[index - 1]);
                            }
                            return isDisabled;
                        });
                        this.select([startDay, date], true);
                    }
                    else if (compareToStart === -1) {
                        this.select([date, null]);
                    }
                    else if (allowSameDay) {
                        this.select([date, date]);
                    }
                }
                else {
                    this.select([date, null]);
                }
            }
            else if (type === 'multiple') {
                let selectedIndex;
                // @ts-ignore
                const selected = currentDate.some((dateItem, index) => {
                    const equal = compareDay(dateItem, date) === 0;
                    if (equal) {
                        selectedIndex = index;
                    }
                    return equal;
                });
                if (selected) {
                    // @ts-ignore
                    const cancelDate = currentDate.splice(selectedIndex, 1);
                    this.setData({ currentDate });
                    this.unselect(cancelDate);
                }
                else {
                    // @ts-ignore
                    this.select([...currentDate, date]);
                }
            }
            else {
                this.select(date, true);
            }
        },
        unselect(dateArray) {
            const date = dateArray[0];
            if (date) {
                this.$emit('unselect', copyDates(date));
            }
        },
        select(date, complete) {
            if (complete && this.data.type === 'range') {
                const valid = this.checkRange(date);
                if (!valid) {
                    // auto selected to max range if showConfirm
                    if (this.data.showConfirm) {
                        this.emit([
                            date[0],
                            getDayByOffset(date[0], this.data.maxRange - 1),
                        ]);
                    }
                    else {
                        this.emit(date);
                    }
                    return;
                }
            }
            this.emit(date);
            if (complete && !this.data.showConfirm) {
                this.onConfirm();
            }
        },
        emit(date) {
            this.setData({
                currentDate: Array.isArray(date) ? date.map(getTime) : getTime(date),
            });
            this.$emit('select', copyDates(date));
        },
        checkRange(date) {
            const { maxRange, rangePrompt, showRangePrompt } = this.data;
            if (maxRange && calcDateNum(date) > maxRange) {
                if (showRangePrompt) {
                    Toast({
                        context: this,
                        message: rangePrompt || `选择天数不能超过 ${maxRange} 天`,
                    });
                }
                this.$emit('over-range');
                return false;
            }
            return true;
        },
        onConfirm() {
            if (this.data.type === 'range' &&
                !this.checkRange(this.data.currentDate)) {
                return;
            }
            wx.nextTick(() => {
                // @ts-ignore
                this.$emit('confirm', copyDates(this.data.currentDate));
            });
        },
        onClickSubtitle(event) {
            this.$emit('click-subtitle', event);
        },
    },
});