using System;
using System.Collections.Generic;
using System.Data;
using Microsoft.Data.Sqlite;
using 報到系統客戶端.Data.Models;

namespace 報到系統客戶端.Data.Repositories
{
    /// <summary>
    /// BPSN 本地資料庫操作類別
    /// 對應員工資料
    /// </summary>
    public class BPSNRepository
    {
        private readonly DatabaseService _dbService;

        public BPSNRepository()
        {
            _dbService = DatabaseService.Instance;
        }

        /// <summary>
        /// 新增一筆 BPSN 資料
        /// </summary>
        public bool Insert(LocalBPSNItem item)
        {
            try
            {
                var conn = _dbService.GetConnection();
                string sql = @"
                    INSERT OR REPLACE INTO BPSN 
                    (BPENO, BPNME, BPAWD, Is系統管理群組, Is客戶管理群組, Is現場工作群組, Is查詢群組, CreatedAt, UpdatedAt)
                    VALUES (@BPENO, @BPNME, @BPAWD, @Is系統管理群組, @Is客戶管理群組, @Is現場工作群組, @Is查詢群組, @CreatedAt, @UpdatedAt)
                ";

                using (SqliteCommand cmd = new SqliteCommand(sql, conn))
                {
                    cmd.Parameters.AddWithValue("@BPENO", item.BPENO ?? (object)DBNull.Value);
                    cmd.Parameters.AddWithValue("@BPNME", item.BPNME ?? (object)DBNull.Value);
                    cmd.Parameters.AddWithValue("@BPAWD", item.BPAWD ?? (object)DBNull.Value);
                    cmd.Parameters.AddWithValue("@Is系統管理群組", item.Is系統管理群組 ? 1 : 0);
                    cmd.Parameters.AddWithValue("@Is客戶管理群組", item.Is客戶管理群組 ? 1 : 0);
                    cmd.Parameters.AddWithValue("@Is現場工作群組", item.Is現場工作群組 ? 1 : 0);
                    cmd.Parameters.AddWithValue("@Is查詢群組", item.Is查詢群組 ? 1 : 0);
                    cmd.Parameters.AddWithValue("@CreatedAt", DateTime.Now);
                    cmd.Parameters.AddWithValue("@UpdatedAt", DateTime.Now);

                    return cmd.ExecuteNonQuery() > 0;
                }
            }
            catch (Exception ex)
            {
                throw new Exception($"新增 BPSN 資料失敗：{ex.Message}", ex);
            }
        }

        /// <summary>
        /// 批量新增 BPSN 資料
        /// </summary>
        public void InsertBatch(List<LocalBPSNItem> items)
        {
            try
            {
                var conn = _dbService.GetConnection();

                using (SqliteTransaction transaction = conn.BeginTransaction())
                {
                    try
                    {
                        foreach (LocalBPSNItem item in items)
                        {
                            string sql = @"
                                INSERT OR REPLACE INTO BPSN 
                                (BPENO, BPNME, BPAWD, Is系統管理群組, Is客戶管理群組, Is現場工作群組, Is查詢群組, CreatedAt, UpdatedAt)
                                VALUES (@BPENO, @BPNME, @BPAWD, @Is系統管理群組, @Is客戶管理群組, @Is現場工作群組, @Is查詢群組, @CreatedAt, @UpdatedAt)
                            ";

                            using (SqliteCommand cmd = new SqliteCommand(sql, conn))
                            {
                                cmd.Transaction = transaction;
                                cmd.Parameters.AddWithValue("@BPENO", item.BPENO ?? (object)DBNull.Value);
                                cmd.Parameters.AddWithValue("@BPNME", item.BPNME ?? (object)DBNull.Value);
                                cmd.Parameters.AddWithValue("@BPAWD", item.BPAWD ?? (object)DBNull.Value);
                                cmd.Parameters.AddWithValue("@Is系統管理群組", item.Is系統管理群組 ? 1 : 0);
                                cmd.Parameters.AddWithValue("@Is客戶管理群組", item.Is客戶管理群組 ? 1 : 0);
                                cmd.Parameters.AddWithValue("@Is現場工作群組", item.Is現場工作群組 ? 1 : 0);
                                cmd.Parameters.AddWithValue("@Is查詢群組", item.Is查詢群組 ? 1 : 0);
                                cmd.Parameters.AddWithValue("@CreatedAt", DateTime.Now);
                                cmd.Parameters.AddWithValue("@UpdatedAt", DateTime.Now);

                                cmd.ExecuteNonQuery();
                            }
                        }

                        transaction.Commit();
                    }
                    catch (Exception)
                    {
                        transaction.Rollback();
                        throw;
                    }
                }
            }
            catch (Exception ex)
            {
                throw new Exception($"批量新增 BPSN 資料失敗：{ex.Message}", ex);
            }
        }

        /// <summary>
        /// 更新一筆 BPSN 資料
        /// </summary>
        public bool Update(LocalBPSNItem item)
        {
            try
            {
                var conn = _dbService.GetConnection();
                string sql = @"
                    UPDATE BPSN SET
                        BPNME = @BPNME,
                        BPAWD = @BPAWD,
                        Is系統管理群組 = @Is系統管理群組,
                        Is客戶管理群組 = @Is客戶管理群組,
                        Is現場工作群組 = @Is現場工作群組,
                        Is查詢群組 = @Is查詢群組,
                        UpdatedAt = @UpdatedAt
                    WHERE BPENO = @BPENO
                ";

                using (SqliteCommand cmd = new SqliteCommand(sql, conn))
                {
                    cmd.Parameters.AddWithValue("@BPENO", item.BPENO ?? (object)DBNull.Value);
                    cmd.Parameters.AddWithValue("@BPNME", item.BPNME ?? (object)DBNull.Value);
                    cmd.Parameters.AddWithValue("@BPAWD", item.BPAWD ?? (object)DBNull.Value);
                    cmd.Parameters.AddWithValue("@Is系統管理群組", item.Is系統管理群組 ? 1 : 0);
                    cmd.Parameters.AddWithValue("@Is客戶管理群組", item.Is客戶管理群組 ? 1 : 0);
                    cmd.Parameters.AddWithValue("@Is現場工作群組", item.Is現場工作群組 ? 1 : 0);
                    cmd.Parameters.AddWithValue("@Is查詢群組", item.Is查詢群組 ? 1 : 0);
                    cmd.Parameters.AddWithValue("@UpdatedAt", DateTime.Now);

                    return cmd.ExecuteNonQuery() > 0;
                }
            }
            catch (Exception ex)
            {
                throw new Exception($"更新 BPSN 資料失敗：{ex.Message}", ex);
            }
        }

        /// <summary>
        /// 刪除一筆 BPSN 資料
        /// </summary>
        public bool Delete(string bpeno)
        {
            try
            {
                var conn = _dbService.GetConnection();
                string sql = "DELETE FROM BPSN WHERE BPENO = @BPENO";

                using (SqliteCommand cmd = new SqliteCommand(sql, conn))
                {
                    cmd.Parameters.AddWithValue("@BPENO", bpeno ?? (object)DBNull.Value);
                    return cmd.ExecuteNonQuery() > 0;
                }
            }
            catch (Exception ex)
            {
                throw new Exception($"刪除 BPSN 資料失敗：{ex.Message}", ex);
            }
        }

        /// <summary>
        /// 查詢所有 BPSN 資料
        /// </summary>
        public List<LocalBPSNItem> GetAll()
        {
            return Query("SELECT * FROM BPSN ORDER BY BPENO ASC");
        }

        /// <summary>
        /// 查詢單筆 BPSN 資料
        /// </summary>
        public LocalBPSNItem GetByBPENO(string bpeno)
        {
            try
            {
                var conn = _dbService.GetConnection();
                string sql = "SELECT * FROM BPSN WHERE BPENO = @BPENO LIMIT 1";

                using (SqliteCommand cmd = new SqliteCommand(sql, conn))
                {
                    cmd.Parameters.AddWithValue("@BPENO", bpeno ?? (object)DBNull.Value);

                    using (SqliteDataReader reader = cmd.ExecuteReader())
                    {
                        if (reader.Read())
                        {
                            return ReadBPSNItem(reader);
                        }
                    }
                }

                return null;
            }
            catch (Exception ex)
            {
                throw new Exception($"查詢 BPSN 資料失敗：{ex.Message}", ex);
            }
        }

        /// <summary>
        /// 條件查詢 BPSN 資料（分頁）
        /// </summary>
        public List<LocalBPSNItem> GetByCondition(int pageIndex, int pageSize, string bpeno = "", string bpnme = "")
        {
            try
            {
                var conn = _dbService.GetConnection();
                string sql = "SELECT * FROM BPSN WHERE 1=1";

                if (!string.IsNullOrWhiteSpace(bpeno))
                    sql += " AND BPENO LIKE '%' || @BPENO || '%'";

                if (!string.IsNullOrWhiteSpace(bpnme))
                    sql += " AND BPNME LIKE '%' || @BPNME || '%'";

                sql += " ORDER BY BPENO ASC LIMIT @PageSize OFFSET @Offset";

                List<LocalBPSNItem> result = new List<LocalBPSNItem>();

                using (SqliteCommand cmd = new SqliteCommand(sql, conn))
                {
                    if (!string.IsNullOrWhiteSpace(bpeno))
                        cmd.Parameters.AddWithValue("@BPENO", bpeno);

                    if (!string.IsNullOrWhiteSpace(bpnme))
                        cmd.Parameters.AddWithValue("@BPNME", bpnme);

                    cmd.Parameters.AddWithValue("@PageSize", pageSize);
                    cmd.Parameters.AddWithValue("@Offset", (pageIndex - 1) * pageSize);

                    using (SqliteDataReader reader = cmd.ExecuteReader())
                    {
                        while (reader.Read())
                        {
                            result.Add(ReadBPSNItem(reader));
                        }
                    }
                }

                return result;
            }
            catch (Exception ex)
            {
                throw new Exception($"查詢 BPSN 資料失敗：{ex.Message}", ex);
            }
        }

        /// <summary>
        /// 查詢 BPSN 資料總數
        /// </summary>
        public int GetCount(string bpeno = "", string bpnme = "")
        {
            try
            {
                var conn = _dbService.GetConnection();
                string sql = "SELECT COUNT(*) FROM BPSN WHERE 1=1";

                if (!string.IsNullOrWhiteSpace(bpeno))
                    sql += " AND BPENO LIKE '%' || @BPENO || '%'";

                if (!string.IsNullOrWhiteSpace(bpnme))
                    sql += " AND BPNME LIKE '%' || @BPNME || '%'";

                using (SqliteCommand cmd = new SqliteCommand(sql, conn))
                {
                    if (!string.IsNullOrWhiteSpace(bpeno))
                        cmd.Parameters.AddWithValue("@BPENO", bpeno);

                    if (!string.IsNullOrWhiteSpace(bpnme))
                        cmd.Parameters.AddWithValue("@BPNME", bpnme);

                    return Convert.ToInt32(cmd.ExecuteScalar());
                }
            }
            catch (Exception ex)
            {
                throw new Exception($"統計 BPSN 資料失敗：{ex.Message}", ex);
            }
        }

        /// <summary>
        /// 清除所有 BPSN 資料
        /// </summary>
        public void DeleteAll()
        {
            try
            {
                var conn = _dbService.GetConnection();
                using (SqliteCommand cmd = new SqliteCommand("DELETE FROM BPSN", conn))
                {
                    cmd.ExecuteNonQuery();
                }
            }
            catch (Exception ex)
            {
                throw new Exception($"清除 BPSN 資料失敗：{ex.Message}", ex);
            }
        }

        /// <summary>
        /// 私用方法 - 執行查詢
        /// </summary>
        private List<LocalBPSNItem> Query(string sql)
        {
            try
            {
                var conn = _dbService.GetConnection();
                List<LocalBPSNItem> result = new List<LocalBPSNItem>();

                using (SqliteCommand cmd = new SqliteCommand(sql, conn))
                {
                    using (SqliteDataReader reader = cmd.ExecuteReader())
                    {
                        while (reader.Read())
                        {
                            result.Add(ReadBPSNItem(reader));
                        }
                    }
                }

                return result;
            }
            catch (Exception ex)
            {
                throw new Exception($"查詢 BPSN 失敗：{ex.Message}", ex);
            }
        }

        /// <summary>
        /// 私用方法 - 讀取資料列
        /// </summary>
        private LocalBPSNItem ReadBPSNItem(SqliteDataReader reader)
        {
            return new LocalBPSNItem
            {
                BPENO = reader.IsDBNull(reader.GetOrdinal("BPENO")) ? null : reader.GetString(reader.GetOrdinal("BPENO")),
                BPNME = reader.IsDBNull(reader.GetOrdinal("BPNME")) ? null : reader.GetString(reader.GetOrdinal("BPNME")),
                BPAWD = reader.IsDBNull(reader.GetOrdinal("BPAWD")) ? null : reader.GetString(reader.GetOrdinal("BPAWD")),
                Is系統管理群組 = reader.GetInt32(reader.GetOrdinal("Is系統管理群組")) != 0,
                Is客戶管理群組 = reader.GetInt32(reader.GetOrdinal("Is客戶管理群組")) != 0,
                Is現場工作群組 = reader.GetInt32(reader.GetOrdinal("Is現場工作群組")) != 0,
                Is查詢群組 = reader.GetInt32(reader.GetOrdinal("Is查詢群組")) != 0,
                CreatedAt = reader.GetDateTime(reader.GetOrdinal("CreatedAt")),
                UpdatedAt = reader.GetDateTime(reader.GetOrdinal("UpdatedAt"))
            };
        }
    }
}