import React, {
  useState,
  useRef,
  forwardRef,
  useImperativeHandle,
} from "react";
import { View, Text, Button, Image } from "@tarojs/components";
import Taro from "@tarojs/taro";
import classnames from "classnames";
import dayjs from "dayjs";
import { CommonPopup } from "@/components";
import orderService from "@/services/orderService";
import styles from "./index.module.scss";
import closeIcon from "@/static/order/orderListClose.svg";

function genRefundNotice(refund_policy) {
  if (refund_policy.length === 0) {
    return {};
  }
  const now = dayjs();
  const deadlines = refund_policy.map((item) => dayjs(item.deadline_formatted));
  let matchPolicyIndex = deadlines.findIndex((d) => d.isAfter(now));
  if (matchPolicyIndex === -1) {
    matchPolicyIndex = refund_policy.length - 1;
  }
  const { deadline_formatted, price, refund_rate } =
    refund_policy[matchPolicyIndex];
  if (refund_rate === 1) {
    return {
      refundPrice: price,
      notice: `本次可全额退款， ¥${price} 将原路退回，请查收`,
    };
  } else if (refund_rate === 0) {
    return {
      refundPrice: 0,
      notice: `当前退出不可退款，后续流程未明确，@麻真瑜`,
    };
  }
  const refundPrice = Number(Math.ceil(price * refund_rate * 100) / 100);
  const leftHours = dayjs(deadline_formatted).diff(dayjs(), "hour");
  return {
    refundPrice,
    notice: `距活动开始已不足${leftHours}h，当前退出您需扣除${
      Math.floor((price - refundPrice) * 100) / 100
    }元`,
  };
}

function renderCancelContent(refund_policy = []) {
  const current = dayjs();
  const policyList = [
    {
      time: "申请退款时间",
      rule: "退款规则",
    },
    ...refund_policy.map((item, index) => {
      const isLast = index === refund_policy.length - 1;
      return {
        time: item.application_time,
        rule: item.refund_rule,
        beforeCurrent: isLast
          ? true
          : current.isBefore(dayjs(item.deadline_formatted)),
      };
    }),
  ];
  const targetIndex = policyList.findIndex((item) => item.beforeCurrent);
  const { notice } = genRefundNotice(refund_policy);
  return (
    <View className={styles.refundPolicy}>
      {/* <View className={styles.moduleTitle}>
        <Text>退款政策</Text>
      </View> */}
      {<View className={styles.specTips}>{notice}</View>}
      {/* 订单信息摘要 */}
      <View className={styles.policyList}>
        {policyList.map((item, index) => (
          <View
            key={index}
            className={classnames(
              styles.policyItem,
              targetIndex > index && index !== 0 ? styles.pastItem : "",
              targetIndex === index ? styles.currentItem : ""
            )}
          >
            <View className={styles.time}>
              {targetIndex === index && (
                <View className={styles.currentTag}>
                  <Text>当前时间段</Text>
                </View>
              )}
              <Text>{item.time}</Text>
            </View>
            <View className={styles.rule}>{item.rule}</View>
          </View>
        ))}
      </View>
    </View>
  );
}

export type RefundRef = {
  show: (item: any, callback: (result: boolean) => void) => void;
};

export default forwardRef<RefundRef>(function RefundPopup(_props, ref) {
  const [visible, setVisible] = useState(false);
  const [refundPolicy, setRefundPolicy] = useState([]);
  const [orderData, setOrderData] = useState({});
  const onDown = useRef<((result: boolean) => void) | null>(null);

  useImperativeHandle(ref, () => ({
    show: onShow,
  }));

  async function onShow(orderItem, onFinish: (result: boolean) => void) {
    const { refund_policy } = orderItem;
    onDown.current = onFinish;
    setOrderData(orderItem);
    setRefundPolicy(refund_policy);
    setVisible(true);
  }

  function onClose() {
    setVisible(false);
    onDown.current?.(false);
  }

  async function handleConfirmQuit() {
    const { order_no, amount } = orderData;
    try {
      const refundRes = await orderService.applicateRefund({
        order_no,
        refund_amount: amount,
        refund_reason: "用户主动退款",
      });
      if (refundRes.code !== 0) {
        throw new Error(refundRes.message);
      }
      Taro.showToast({
        title: "退出成功",
        icon: "none",
      });
      onDown.current?.(true);
    } catch (e) {
      Taro.showToast({
        title: e.message,
        icon: "error",
      });
    } finally {
      onClose();
    }
  }
  return (
    <CommonPopup
      visible={visible}
      onClose={onClose}
      // title="退出活动"
      enableDragToClose={false}
      zIndex={1001}
      hideFooter
    >
      <View className={styles.container}>
        <View className={styles.header}>
          <Text className={styles.title}>退出活动</Text>
          <Image
            className={styles.closeIcon}
            src={closeIcon}
            onClick={onClose}
          />
        </View>
        {renderCancelContent(refundPolicy)}
        <Button className={styles.action} onClick={handleConfirmQuit}>
          确认并退出
        </Button>
      </View>
    </CommonPopup>
  );
});