using System.Data;
using Microsoft.Data.SqlClient;

namespace YY.Admin.Services.Service.EquipmentDb;

/// <summary>
/// 开炼机动作中间表 MCSToMES_Act_Mill 只读查询（直连设备库）。
/// </summary>
public interface IMcsActMillService
{
    Task<(IReadOnlyList<McsActMillRow> Records, long Total)> PageAsync(
        int pageNo,
        int pageSize,
        string? actName = null,
        int? actAddr = null,
        CancellationToken cancellationToken = default);
}

public sealed class McsActMillRow
{
    public string? Guid { get; set; }
    public int? ActAddr { get; set; }
    public string? ActName { get; set; }
    public string? ActNameEn { get; set; }
    public string? ActMemo { get; set; }
    public int? ActRepaddr { get; set; }
    public DateTime? WriteTime { get; set; }
    public DateTime? ReadTime { get; set; }
    public int? RwFlag { get; set; }
}

public sealed class McsActMillService : IMcsActMillService
{
    private const string TableName = "MCSToMES_Act_Mill";
    private readonly IEquipmentDbConnectionFactory _factory;

    public McsActMillService(IEquipmentDbConnectionFactory factory)
    {
        _factory = factory;
    }

    public async Task<(IReadOnlyList<McsActMillRow> Records, long Total)> PageAsync(
        int pageNo,
        int pageSize,
        string? actName = null,
        int? actAddr = null,
        CancellationToken cancellationToken = default)
    {
        if (pageNo < 1) pageNo = 1;
        if (pageSize < 1) pageSize = 20;

        _factory.Reload();
        await using var conn = _factory.CreateConnection();
        await conn.OpenAsync(cancellationToken).ConfigureAwait(false);

        var where = new List<string>();
        var parameters = new List<SqlParameter>();
        if (!string.IsNullOrWhiteSpace(actName))
        {
            where.Add("act_name LIKE @actName");
            parameters.Add(new SqlParameter("@actName", SqlDbType.NVarChar, 50) { Value = "%" + actName.Trim() + "%" });
        }
        if (actAddr.HasValue)
        {
            where.Add("act_addr = @actAddr");
            parameters.Add(new SqlParameter("@actAddr", SqlDbType.Int) { Value = actAddr.Value });
        }
        var whereSql = where.Count == 0 ? "" : " WHERE " + string.Join(" AND ", where);

        var countSql = $"SELECT COUNT(1) FROM [{TableName}]{whereSql}";
        EquipmentDbWhitelist.ValidateSql(countSql, TableName);
        long total;
        await using (var countCmd = conn.CreateCommand())
        {
            countCmd.CommandText = countSql;
            countCmd.Parameters.AddRange(CloneParams(parameters));
            var scalar = await countCmd.ExecuteScalarAsync(cancellationToken).ConfigureAwait(false);
            total = Convert.ToInt64(scalar ?? 0);
        }

        var offset = (pageNo - 1) * pageSize;
        var listSql = $@"
SELECT [GUID], [act_addr], [act_name], [act_name_en], [act_memo], [act_Repaddr], [WriteTime], [ReadTime], [RW_Flag]
FROM [{TableName}]{whereSql}
ORDER BY [WriteTime] DESC, [GUID]
OFFSET @offset ROWS FETCH NEXT @pageSize ROWS ONLY";
        EquipmentDbWhitelist.ValidateSql(listSql, TableName);

        var rows = new List<McsActMillRow>();
        await using (var listCmd = conn.CreateCommand())
        {
            listCmd.CommandText = listSql;
            listCmd.Parameters.AddRange(CloneParams(parameters));
            listCmd.Parameters.Add(new SqlParameter("@offset", SqlDbType.Int) { Value = offset });
            listCmd.Parameters.Add(new SqlParameter("@pageSize", SqlDbType.Int) { Value = pageSize });
            await using var reader = await listCmd.ExecuteReaderAsync(cancellationToken).ConfigureAwait(false);
            while (await reader.ReadAsync(cancellationToken).ConfigureAwait(false))
            {
                rows.Add(new McsActMillRow
                {
                    Guid = reader["GUID"] as string,
                    ActAddr = reader["act_addr"] == DBNull.Value ? null : Convert.ToInt32(reader["act_addr"]),
                    ActName = reader["act_name"] as string,
                    ActNameEn = reader["act_name_en"] as string,
                    ActMemo = reader["act_memo"] as string,
                    ActRepaddr = reader["act_Repaddr"] == DBNull.Value ? null : Convert.ToInt32(reader["act_Repaddr"]),
                    WriteTime = reader["WriteTime"] == DBNull.Value ? null : Convert.ToDateTime(reader["WriteTime"]),
                    ReadTime = reader["ReadTime"] == DBNull.Value ? null : Convert.ToDateTime(reader["ReadTime"]),
                    RwFlag = reader["RW_Flag"] == DBNull.Value ? null : Convert.ToInt32(reader["RW_Flag"]),
                });
            }
        }

        return (rows, total);
    }

    private static SqlParameter[] CloneParams(List<SqlParameter> source)
    {
        return source.Select(p => new SqlParameter(p.ParameterName, p.SqlDbType)
        {
            Size = p.Size,
            Value = p.Value ?? DBNull.Value
        }).ToArray();
    }
}