import { VantComponent } from '../common/component';
import { isDef } from '../common/utils';
const currentYear = new Date().getFullYear();
function isValidDate(date) {
    return isDef(date) && !isNaN(new Date(date).getTime());
}
function range(num, min, max) {
    return Math.min(Math.max(num, min), max);
}
function padZero(val) {
    return `00${val}`.slice(-2);
}
function times(n, iteratee) {
    let index = -1;
    const result = Array(n);
    while (++index < n) {
        result[index] = iteratee(index);
    }
    return result;
}
function getTrueValue(formattedValue) {
    if (!formattedValue)
        return;
    while (isNaN(parseInt(formattedValue, 10))) {
        formattedValue = formattedValue.slice(1);
    }
    return parseInt(formattedValue, 10);
}
function getMonthEndDay(year, month) {
    return 32 - new Date(year, month - 1, 32).getDate();
}
VantComponent({
    props: {
        value: null,
        title: String,
        loading: Boolean,
        itemHeight: {
            type: Number,
            value: 44
        },
        visibleItemCount: {
            type: Number,
            value: 5
        },
        confirmButtonText: {
            type: String,
            value: '确认'
        },
        cancelButtonText: {
            type: String,
            value: '取消'
        },
        type: {
            type: String,
            value: 'datetime'
        },
        showToolbar: {
            type: Boolean,
            value: true
        },
        minDate: {
            type: Number,
            value: new Date(currentYear - 10, 0, 1).getTime()
        },
        maxDate: {
            type: Number,
            value: new Date(currentYear + 10, 11, 31).getTime()
        },
        minHour: {
            type: Number,
            value: 0
        },
        maxHour: {
            type: Number,
            value: 23
        },
        minMinute: {
            type: Number,
            value: 0
        },
        maxMinute: {
            type: Number,
            value: 59
        }
    },
    data: {
        innerValue: Date.now(),
        columns: []
    },
    watch: {
        value(val) {
            const { data } = this;
            val = this.correctValue(val);
            const isEqual = val === data.innerValue;
            if (!isEqual) {
                this.updateColumnValue(val).then(() => {
                    this.$emit('input', val);
                });
            }
        },
        type: 'updateColumns',
        minHour: 'updateColumns',
        maxHour: 'updateColumns',
        minMinute: 'updateColumns',
        maxMinute: 'updateColumns'
    },
    methods: {
        getPicker() {
            if (this.picker == null) {
                const picker = this.picker = this.selectComponent('.van-datetime-picker');
                const { setColumnValues } = picker;
                picker.setColumnValues = (...args) => setColumnValues.apply(picker, [...args, false]);
            }
            return this.picker;
        },
        updateColumns() {
            const results = this.getRanges().map(({ type, range }, index) => {
                const values = times(range[1] - range[0] + 1, index => {
                    let value = range[0] + index;
                    value = type === 'year' ? `${value}` : padZero(value);
                    return value;
                });
                return { values };
            });
            return this.set({ columns: results });
        },
        getRanges() {
            const { data } = this;
            if (data.type === 'time') {
                return [
                    {
                        type: 'hour',
                        range: [data.minHour, data.maxHour]
                    },
                    {
                        type: 'minute',
                        range: [data.minMinute, data.maxMinute]
                    }
                ];
            }
            const { maxYear, maxDate, maxMonth, maxHour, maxMinute } = this.getBoundary('max', data.innerValue);
            const { minYear, minDate, minMonth, minHour, minMinute } = this.getBoundary('min', data.innerValue);
            const result = [
                {
                    type: 'year',
                    range: [minYear, maxYear]
                },
                {
                    type: 'month',
                    range: [minMonth, maxMonth]
                },
                {
                    type: 'day',
                    range: [minDate, maxDate]
                },
                {
                    type: 'hour',
                    range: [minHour, maxHour]
                },
                {
                    type: 'minute',
                    range: [minMinute, maxMinute]
                }
            ];
            if (data.type === 'date')
                result.splice(3, 2);
            if (data.type === 'year-month')
                result.splice(2, 3);
            return result;
        },
        correctValue(value) {
            const { data } = this;
            // validate value
            const isDateType = data.type !== 'time';
            if (isDateType && !isValidDate(value)) {
                value = data.minDate;
            }
            else if (!isDateType && !value) {
                const { minHour } = data;
                value = `${padZero(minHour)}:00`;
            }
            // time type
            if (!isDateType) {
                let [hour, minute] = value.split(':');
                hour = padZero(range(hour, data.minHour, data.maxHour));
                minute = padZero(range(minute, data.minMinute, data.maxMinute));
                return `${hour}:${minute}`;
            }
            // date type
            value = Math.max(value, data.minDate);
            value = Math.min(value, data.maxDate);
            return value;
        },
        getBoundary(type, innerValue) {
            const value = new Date(innerValue);
            const boundary = new Date(this.data[`${type}Date`]);
            const year = boundary.getFullYear();
            let month = 1;
            let date = 1;
            let hour = 0;
            let minute = 0;
            if (type === 'max') {
                month = 12;
                date = getMonthEndDay(value.getFullYear(), value.getMonth() + 1);
                hour = 23;
                minute = 59;
            }
            if (value.getFullYear() === year) {
                month = boundary.getMonth() + 1;
                if (value.getMonth() + 1 === month) {
                    date = boundary.getDate();
                    if (value.getDate() === date) {
                        hour = boundary.getHours();
                        if (value.getHours() === hour) {
                            minute = boundary.getMinutes();
                        }
                    }
                }
            }
            return {
                [`${type}Year`]: year,
                [`${type}Month`]: month,
                [`${type}Date`]: date,
                [`${type}Hour`]: hour,
                [`${type}Minute`]: minute
            };
        },
        onCancel() {
            this.$emit('cancel');
        },
        onConfirm() {
            this.$emit('confirm', this.data.innerValue);
        },
        onChange() {
            const { data } = this;
            let value;
            const picker = this.getPicker();
            if (data.type === 'time') {
                const indexes = picker.getIndexes();
                value = `${indexes[0] + data.minHour}:${indexes[1] + data.minMinute}`;
            }
            else {
                const values = picker.getValues();
                const year = getTrueValue(values[0]);
                const month = getTrueValue(values[1]);
                const maxDate = getMonthEndDay(year, month);
                let date = getTrueValue(values[2]);
                if (data.type === 'year-month') {
                    date = 1;
                }
                date = date > maxDate ? maxDate : date;
                let hour = 0;
                let minute = 0;
                if (data.type === 'datetime') {
                    hour = getTrueValue(values[3]);
                    minute = getTrueValue(values[4]);
                }
                value = new Date(year, month - 1, date, hour, minute);
            }
            value = this.correctValue(value);
            this.updateColumnValue(value).then(() => {
                this.$emit('input', value);
                this.$emit('change', picker);
            });
        },
        updateColumnValue(value) {
            let values = [];
            const { data } = this;
            const picker = this.getPicker();
            if (data.type === 'time') {
                const pair = value.split(':');
                values = [pair[0], pair[1]];
            }
            else {
                const date = new Date(value);
                values = [`${date.getFullYear()}`, padZero(date.getMonth() + 1)];
                if (data.type === 'date') {
                    values.push(padZero(date.getDate()));
                }
                if (data.type === 'datetime') {
                    values.push(padZero(date.getDate()), padZero(date.getHours()), padZero(date.getMinutes()));
                }
            }
            return this.set({ innerValue: value })
                .then(() => this.updateColumns())
                .then(() => picker.setValues(values));
        }
    },
    created() {
        const innerValue = this.correctValue(this.data.value);
        this.updateColumnValue(innerValue).then(() => {
            this.$emit('input', innerValue);
        });
    }
});