package com.rj.util;

import com.fasterxml.jackson.databind.JsonNode;
import com.rj.entity.LbBuyerShopping;

import java.math.BigDecimal;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.time.format.DateTimeParseException;
import java.util.ArrayList;
import java.util.List;

/**
 * 将 hxrd {@code /api/order/list} 响应中的订单节点解析为 {@link LbBuyerShopping}。
 */
public final class LbBuyerShoppingOrderParser {

    private static final DateTimeFormatter DATE_TIME_FORMATTER =
            DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");

    private LbBuyerShoppingOrderParser() {
    }

    public static List<LbBuyerShopping> parseOrderList(JsonNode dataNode) {
        JsonNode listNode = extractListNode(dataNode);
        if (listNode == null || !listNode.isArray() || listNode.isEmpty()) {
            return List.of();
        }
        if (listNode.get(0).isTextual() || listNode.get(0).isNumber()) {
            return List.of();
        }

        List<LbBuyerShopping> orders = new ArrayList<>(listNode.size());
        for (JsonNode item : listNode) {
            LbBuyerShopping entity = fromOrderNode(item);
            if (entity != null) {
                orders.add(entity);
            }
        }
        return orders;
    }

    public static boolean resolveHasMore(JsonNode dataNode, int rowCount, int pageLimit) {
        if (dataNode != null && dataNode.isObject()) {
            if (dataNode.has("hasmore")) {
                return dataNode.path("hasmore").asBoolean(false);
            }
        }
        return rowCount >= pageLimit;
    }

    public static int resolveLastPage(JsonNode dataNode, int safePage, boolean hasMore) {
        if (dataNode != null && dataNode.isObject()) {
            int lastPage = dataNode.path("last_page").asInt(-1);
            if (lastPage >= 1) {
                return lastPage;
            }
        }
        return hasMore ? Integer.MAX_VALUE : safePage;
    }

    public static LbBuyerShopping fromOrderNode(JsonNode node) {
        if (node == null || node.isNull() || !node.isObject()) {
            return null;
        }
        Long id = longValue(node.get("id"));
        if (id == null) {
            return null;
        }

        LbBuyerShopping entity = new LbBuyerShopping();
        entity.setId(id);
        entity.setSellerId(longValue(node.get("seller_id")));
        entity.setMerchandiseId(longValue(node.get("merchandise_id")));
        entity.setBuyerId(longValue(node.get("buyer_id")));
        entity.setOrderSn(textValue(node.get("order_sn")));
        entity.setTotalMoney(parseMoney(textValue(node.get("total_money"))));
        entity.setNewTotal(parseMoney(textValue(node.get("new_total"))));
        entity.setCreatedAt(parseDateTime(textValue(node.get("created_at"))));
        entity.setBuyTime(parseDateTime(textValue(node.get("buy_time"))));
        entity.setConfirmTime(parseDateTime(textValue(node.get("confirm_time"))));

        JsonNode seller = node.get("seller");
        if (seller != null && seller.isObject()) {
            entity.setSellerNickname(textValue(seller.get("nickname")));
            entity.setSellerMobile(textValue(seller.get("mobile")));
        } else {
            entity.setSellerNickname(textValue(node.get("seller_name")));
            entity.setSellerMobile(textValue(node.get("seller_phone")));
        }

        JsonNode buyer = node.get("buyer");
        if (buyer != null && buyer.isObject()) {
            entity.setBuyerNickname(textValue(buyer.get("nickname")));
            entity.setBuyerMobile(textValue(buyer.get("mobile")));
        } else {
            entity.setBuyerNickname(textValue(node.get("buyer_name")));
            entity.setBuyerMobile(textValue(node.get("buyer_phone")));
        }
        return entity;
    }

    private static JsonNode extractListNode(JsonNode dataNode) {
        if (dataNode == null || dataNode.isNull()) {
            return null;
        }
        if (dataNode.isArray()) {
            return dataNode;
        }
        if (dataNode.isObject()) {
            return dataNode.get("list");
        }
        return null;
    }

    private static Long longValue(JsonNode node) {
        if (node == null || node.isNull()) {
            return null;
        }
        if (node.isNumber()) {
            return node.longValue();
        }
        String text = node.asText(null);
        if (text == null || text.isBlank()) {
            return null;
        }
        try {
            return Long.parseLong(text.trim());
        } catch (NumberFormatException e) {
            return null;
        }
    }

    private static String textValue(JsonNode node) {
        if (node == null || node.isNull()) {
            return null;
        }
        String text = node.asText(null);
        if (text == null) {
            return null;
        }
        text = text.trim();
        return text.isEmpty() ? null : text;
    }

    private static BigDecimal parseMoney(String money) {
        if (money == null || money.isBlank()) {
            return null;
        }
        try {
            return new BigDecimal(money.trim());
        } catch (NumberFormatException e) {
            return null;
        }
    }

    private static LocalDateTime parseDateTime(String text) {
        if (text == null || text.isBlank()) {
            return null;
        }
        String trimmed = text.trim();
        try {
            return LocalDateTime.parse(trimmed, DATE_TIME_FORMATTER);
        } catch (DateTimeParseException ignored) {
            // continue
        }
        try {
            return LocalDateTime.parse(trimmed, DateTimeFormatter.ISO_LOCAL_DATE_TIME);
        } catch (DateTimeParseException e) {
            return null;
        }
    }
}