<template>
    <view
        class="van-swipe-cell"
        data-key="cell"
        @tap.stop.prevent="onClick"
        @touchstart="startDrag"
        @touchmove.stop.prevent="parseEventDynamicCode($event, catchMove ? 'noop' : '')"
        @touchmove.capture="onDrag"
        @touchend="endDrag"
        @touchcancel="endDrag"
    >
        <view :style="wrapperStyle">
            <view v-if="leftWidth" class="van-swipe-cell__left" data-key="left" @tap.stop.prevent="onClick">
                <slot name="left" />
            </view>
            <slot />
            <view v-if="rightWidth" class="van-swipe-cell__right" data-key="right" @tap.stop.prevent="onClick">
                <slot name="right" />
            </view>
        </view>
    </view>
</template>

<script>
import { VantComponent } from '../common/component';
import { touch } from '../mixins/touch';
import { range } from '../common/utils';
const THRESHOLD = 0.3;
let ARRAY = [];
export default {
    data() {
        return {
            catchMove: false,
            wrapperStyle: ''
        };
    },
    props: {
        disabled: Boolean,
        leftWidth: {
            type: Number,
            default: 0
        },
        rightWidth: {
            type: Number,
            default: 0
        },
        asyncClose: Boolean,
        name: {
            type: [Number, String],
            default: ''
        }
    },
    mixins: [touch],
    created() {
        this.offset = 0;
        ARRAY.push(this);
    },
    destroyed() {
        ARRAY = ARRAY.filter((item) => item !== this);
    },
    methods: {
        open(position) {
            const { leftWidth, rightWidth } = this;
            const offset = position === 'left' ? leftWidth : -rightWidth;
            this.swipeMove(offset);
            this.$emit('open', {
                position,
                name: this.name
            });
        },
        close() {
            this.swipeMove(0);
        },
        swipeMove(offset = 0) {
            this.offset = range(offset, -this.rightWidth, this.leftWidth);
            const transform = `translate3d(${this.offset}px, 0, 0)`;
            const transition = this.dragging ? 'none' : 'transform .6s cubic-bezier(0.18, 0.89, 0.32, 1)';
            this.setData({
                wrapperStyle: `
      -webkit-transform: ${transform};
      -webkit-transition: ${transition};
      transform: ${transform};
      transition: ${transition};
    `
            });
        },
        swipeLeaveTransition() {
            const { leftWidth, rightWidth } = this;
            const { offset } = this;
            if (rightWidth > 0 && -offset > rightWidth * THRESHOLD) {
                this.open('right');
            } else if (leftWidth > 0 && offset > leftWidth * THRESHOLD) {
                this.open('left');
            } else {
                this.swipeMove(0);
            }
            this.setData({
                catchMove: false
            });
        },
        startDrag(event) {
            if (this.disabled) {
                return;
            }
            this.startOffset = this.offset;
            this.touchStart(event);
        },
        noop() {},
        onDrag(event) {
            if (this.disabled) {
                return;
            }
            this.touchMove(event);
            if (this.direction !== 'horizontal') {
                return;
            }
            this.dragging = true;
            ARRAY.filter((item) => item !== this).forEach((item) => item.close());
            this.setData({
                catchMove: true
            });
            this.swipeMove(this.startOffset + this.deltaX);
        },
        endDrag() {
            if (this.disabled) {
                return;
            }
            this.dragging = false;
            this.swipeLeaveTransition();
        },
        onClick(event) {
            const { key: position = 'outside' } = event.currentTarget.dataset;
            this.$emit('click', position);
            if (!this.offset) {
                return;
            }
            if (this.asyncClose) {
                this.$emit('close', {
                    position,
                    instance: this,
                    name: this.name
                });
            } else {
                this.swipeMove(0);
            }
        }
    },
    watch: {
        leftWidth: {
            handler: function (leftWidth = 0) {
                if (this.offset > 0) {
                    this.swipeMove(leftWidth);
                }
            },

            immediate: true
        },

        rightWidth: {
            handler: function (rightWidth = 0) {
                if (this.offset < 0) {
                    this.swipeMove(-rightWidth);
                }
            },

            immediate: true
        }
    }
};
</script>
<style>
@import './index.css';
</style>
