using Dapper;
using MySqlConnector;
using YieldChain.Helpers;
using YLErp.BLL;

namespace YLErp.Modules.UnderlyingModule
{
    public enum FundManagerLookupStatus
    {
        NotFound,
        Unique,
        Multiple,
        Unavailable
    }

    public sealed class FundManagerLookupResult
    {
        public FundManagerLookupStatus Status { get; init; }
        public string InvestAdvisorName { get; init; }
    }

    /// <summary>
    /// 查询上游基金档案中的基金管理人。上游不可用时返回降级结果，不阻断页面编辑。
    /// </summary>
    public sealed class FundManagerLookupService
    {
        private sealed class FundManagerRow
        {
            public string InvestAdvisorCode { get; set; }
            public string InvestAdvisorName { get; set; }
        }

        //物理库名由连接串 database= 决定（DbSchema 解析），各环境库名不同（如测试环境 glms_bigdata），
        //SQL 不硬编码库名；连接开在 bigdata 数据源上，将来跨库 join ERP 主库时用 DbSchema.Of("ylcms") 同法插值
        private string BuildLookupSql()
        {
            return $@"
SELECT
    ia.investadvisorcode AS InvestAdvisorCode,
    ia.investadvisorname AS InvestAdvisorName
FROM {DbSchema.Of("bigdata")}.mf_fundarchives AS fa
INNER JOIN {DbSchema.Of("bigdata")}.mf_investadvisoroutline AS ia
    ON CONVERT(fa.investadvisorcode USING utf8mb4) COLLATE utf8mb4_unicode_ci =
       CONVERT(ia.investadvisorcode USING utf8mb4) COLLATE utf8mb4_unicode_ci
WHERE CONVERT(fa.secucode USING utf8mb4) COLLATE utf8mb4_unicode_ci =
      CONVERT(TRIM(SUBSTRING_INDEX(@UnderlyingCode, '.', 1)) USING utf8mb4) COLLATE utf8mb4_unicode_ci";
        }

        public FundManagerLookupResult Lookup(string underlyingCode)
        {
            var normalizedCode = NormalizeCode(underlyingCode);
            if (string.IsNullOrEmpty(normalizedCode))
            {
                return new FundManagerLookupResult { Status = FundManagerLookupStatus.NotFound };
            }

            var connectionString = AppManager.GetConnectionString("bigdata");
            if (string.IsNullOrWhiteSpace(connectionString))
            {
                return new FundManagerLookupResult { Status = FundManagerLookupStatus.Unavailable };
            }

            try
            {
                using var connection = new MySqlConnection(connectionString);
                var matches = connection.Query<FundManagerRow>(BuildLookupSql(), new { UnderlyingCode = normalizedCode }, commandTimeout: 10)
                    .Where(row => !string.IsNullOrWhiteSpace(row.InvestAdvisorName))
                    .GroupBy(row => (row.InvestAdvisorCode ?? string.Empty).Trim(), StringComparer.OrdinalIgnoreCase)
                    .Select(group => group.Select(row => row.InvestAdvisorName.Trim()).Distinct(StringComparer.OrdinalIgnoreCase).ToArray())
                    .Where(names => names.Length > 0)
                    .ToArray();

                return matches.Length switch
                {
                    0 => new FundManagerLookupResult { Status = FundManagerLookupStatus.NotFound },
                    1 when matches[0].Length == 1 => new FundManagerLookupResult { Status = FundManagerLookupStatus.Unique, InvestAdvisorName = matches[0][0] },
                    _ => new FundManagerLookupResult { Status = FundManagerLookupStatus.Multiple }
                };
            }
            catch (Exception ex)
            {
                LogFactory.GetLogger<FundManagerLookupService>().Error("查询基金管理人失败，代码:" + normalizedCode, ex);
                return new FundManagerLookupResult { Status = FundManagerLookupStatus.Unavailable };
            }
        }

        public static string NormalizeCode(string underlyingCode)
        {
            var trimmed = underlyingCode?.Trim();
            if (string.IsNullOrEmpty(trimmed))
            {
                return null;
            }

            var dotIndex = trimmed.IndexOf('.');
            return (dotIndex < 0 ? trimmed : trimmed.Substring(0, dotIndex)).TrimToNull();
        }
    }
}