using System;
using System.Collections.Generic;
using System.Data;
using Dapper;
using MySql.Data.MySqlClient;
using CncModels.Enum;
using CncModels.Entity;
using log4net;

namespace CncCollector.Core
{
    /// <summary>
    /// 零件产量分段跟踪引擎：维护内存中的活跃段状态，并定期写入数据库。
    /// </summary>
    public class ProductionTracker
    {
        private readonly string _connectionString;
        private readonly object _lock = new object();
        private static readonly ILog Log = LogManager.GetLogger(typeof(ProductionTracker));

        public ProductionTracker(string connectionString)
        {
            _connectionString = connectionString ?? throw new ArgumentNullException(nameof(connectionString));
        }

        /// <summary>
        /// 处理一个采集记录后的产量跟踪逻辑。
        /// </summary>
        public void Track(int machineId, string programName, int partCount, DateTime collectTime)
        {
            lock (_lock)
            {
                using (var conn = new MySqlConnection(_connectionString))
                {
                    conn.Open();
                    // 查找当前未结算的活跃段
                    var active = conn.QueryFirstOrDefault<ProductionSegment>(
                        "SELECT * FROM cnc_production_segment WHERE machine_id=@MachineId AND is_settled=0 AND end_time IS NULL",
                        new { MachineId = machineId });

                    if (active == null)
                    {
                        // 开新段
                        const string sqlStart = @"INSERT INTO cnc_production_segment
                            (machine_id, program_name, production_date, start_time, start_part_count, is_settled)
                          VALUES
                            (@MachineId, @ProgramName, @ProductionDate, @StartTime, @StartPartCount, 0)";
                        conn.Execute(sqlStart, new
                        {
                            MachineId = machineId,
                            ProgramName = programName,
                            ProductionDate = collectTime.Date,
                            StartTime = collectTime,
                            StartPartCount = partCount
                        });
                    }
                    else
                    {
                        // 程序名变更则结账并开新段
                        if (!string.Equals(active.ProgramName, programName, StringComparison.OrdinalIgnoreCase))
                        {
                            const string sqlClose = @"UPDATE cnc_production_segment
                                SET end_time=@EndTime, end_part_count=@EndPartCount, is_settled=1, close_reason=@Reason
                                WHERE id=@Id";
                            conn.Execute(sqlClose, new
                            {
                                EndTime = collectTime,
                                EndPartCount = active.EndPartCount ?? active.StartPartCount,
                                Id = active.Id,
                                Reason = SegmentCloseReason.ProgramChange.ToString()
                            });

                            const string sqlStart = @"INSERT INTO cnc_production_segment
                                (machine_id, program_name, production_date, start_time, start_part_count, is_settled)
                              VALUES
                                (@MachineId, @ProgramName, @ProductionDate, @StartTime, @StartPartCount, 0)";
                            conn.Execute(sqlStart, new
                            {
                                MachineId = machineId,
                                ProgramName = programName,
                                ProductionDate = collectTime.Date,
                                StartTime = collectTime,
                                StartPartCount = partCount
                            });
                        }
                        else
                        {
                            // 更新当前段的结束时间与结束时的部件数
                            const string sqlUpdate = @"UPDATE cnc_production_segment
                                SET end_time=@EndTime, end_part_count=@EndPartCount
                                WHERE id=@Id";
                            conn.Execute(sqlUpdate, new
                            {
                                EndTime = collectTime,
                                EndPartCount = partCount,
                                Id = active.Id
                            });
                        }
                    }
                }
            }
        }
    }
}