using System.Text.RegularExpressions;
using Oms.Application.Dtos.Orders;
using Oms.Domain.ChannelsAggregate.Entities;

namespace Oms.Application.Shared;

/// <summary>
/// KPI 分区快照映射与左开右闭邮编匹配。
/// </summary>
public static class KpiAreaSnapshotMapper
{
    private static readonly Regex PostcodeRangePattern = new(
        @"^\(\s*([^,)\]]*)\s*,\s*([^,)\]]*)\s*\]$",
        RegexOptions.Compiled | RegexOptions.CultureInvariant);

    public static KpiAreaSnapshotRuleDto MapToSnapshotRule(KpiAreaInfo entity) =>
        new()
        {
            Id = entity.Id,
            CountryCode = entity.CountryCode,
            Province = entity.Province,
            City = entity.City,
            PostcodeRange = BuildPostcodeRange(entity.LeftPostcode, entity.RightPostcode)
        };

    public static string? BuildPostcodeRange(string? left, string? right)
    {
        if (string.IsNullOrWhiteSpace(left) && string.IsNullOrWhiteSpace(right))
        {
            return null;
        }

        return $"({left?.Trim()},{right?.Trim()}]";
    }

    public static string? ResolvePostcodeRange(KpiAreaSnapshotRuleDto rule)
    {
        if (!string.IsNullOrWhiteSpace(rule.PostcodeRange))
        {
            return rule.PostcodeRange.Trim();
        }

        return BuildPostcodeRange(rule.LeftPostcode, rule.RightPostcode);
    }

    public static bool IsRuleMatched(
        KpiAreaSnapshotRuleDto rule,
        string countryCode,
        string? province,
        string? city,
        string? zipCode)
    {
        if (!string.IsNullOrWhiteSpace(rule.CountryCode)
            && !string.Equals(rule.CountryCode, countryCode, StringComparison.OrdinalIgnoreCase))
        {
            return false;
        }

        if (!string.IsNullOrWhiteSpace(rule.Province)
            && !string.Equals(rule.Province, province, StringComparison.OrdinalIgnoreCase))
        {
            return false;
        }

        if (!string.IsNullOrWhiteSpace(rule.City)
            && !string.Equals(rule.City, city, StringComparison.OrdinalIgnoreCase))
        {
            return false;
        }

        var postcodeRange = ResolvePostcodeRange(rule);
        if (string.IsNullOrWhiteSpace(postcodeRange))
        {
            return true;
        }

        if (string.IsNullOrWhiteSpace(zipCode))
        {
            return false;
        }

        return IsZipInLeftOpenRightClosedRange(zipCode.Trim(), postcodeRange);
    }

    public static bool IsZipInLeftOpenRightClosedRange(string zipCode, string postcodeRange)
    {
        var match = PostcodeRangePattern.Match(postcodeRange.Trim());
        if (!match.Success)
        {
            return false;
        }

        var left = match.Groups[1].Value.Trim();
        var right = match.Groups[2].Value.Trim();
        if (long.TryParse(zipCode, out var zip)
            && long.TryParse(left, out var leftValue)
            && long.TryParse(right, out var rightValue))
        {
            return zip > leftValue && zip <= rightValue;
        }

        return string.Compare(zipCode, left, StringComparison.OrdinalIgnoreCase) > 0
               && string.Compare(zipCode, right, StringComparison.OrdinalIgnoreCase) <= 0;
    }
}