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>
    /// SignUps 本地資料庫操作類別
    /// </summary>
    public class SignUpsRepository
    {
        private readonly DatabaseService _dbService;

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

        /// <summary>
        /// 新增一筆 SignUps 資料
        /// </summary>
        public int Insert(LocalSignUpItem item)
        {
            try
            {
                var conn = _dbService.GetConnection();
                string sql = @"
                    INSERT INTO SignUps 
                    (CourseID, SeqNo, Name, Mobile, QRCode, SignUpType, IDNumber, IDType, MealType, Email, LossJobTimes, Gender, AgreementStatus, CheckInTime, CheckOutTime, CreatedAt, UpdatedAt)
                    VALUES (@CourseID, @SeqNo, @Name, @Mobile, @QRCode, @SignUpType, @IDNumber, @IDType, @MealType, @Email, @LossJobTimes, @Gender, @AgreementStatus, @CheckInTime, @CheckOutTime, @CreatedAt, @UpdatedAt)
                ";

                using (SqliteCommand cmd = new SqliteCommand(sql, conn))
                {
                    cmd.Parameters.AddWithValue("@CourseID", item.CourseID);
                    cmd.Parameters.AddWithValue("@SeqNo", item.SeqNo);
                    cmd.Parameters.AddWithValue("@Name", item.Name ?? (object)DBNull.Value);
                    cmd.Parameters.AddWithValue("@Mobile", item.Mobile ?? (object)DBNull.Value);
                    cmd.Parameters.AddWithValue("@QRCode", item.QRCode ?? (object)DBNull.Value);
                    cmd.Parameters.AddWithValue("@SignUpType", item.SignUpType ?? (object)DBNull.Value);
                    cmd.Parameters.AddWithValue("@IDNumber", item.IDNumber ?? (object)DBNull.Value);
                    cmd.Parameters.AddWithValue("@IDType", item.IDType ?? (object)DBNull.Value);
                    cmd.Parameters.AddWithValue("@MealType", item.MealType ?? (object)DBNull.Value);
                    cmd.Parameters.AddWithValue("@Email", item.Email ?? (object)DBNull.Value);
                    cmd.Parameters.AddWithValue("@LossJobTimes", item.LossJobTimes.HasValue ? (object)item.LossJobTimes.Value : DBNull.Value);
                    cmd.Parameters.AddWithValue("@Gender", item.Gender ?? (object)DBNull.Value);
                    cmd.Parameters.AddWithValue("@AgreementStatus", item.AgreementStatus ?? (object)DBNull.Value);
                    cmd.Parameters.AddWithValue("@CheckInTime", item.CheckInTime ?? (object)DBNull.Value);
                    cmd.Parameters.AddWithValue("@CheckOutTime", item.CheckOutTime ?? (object)DBNull.Value);
                    cmd.Parameters.AddWithValue("@CreatedAt", DateTime.Now);
                    cmd.Parameters.AddWithValue("@UpdatedAt", DateTime.Now);

                    cmd.ExecuteNonQuery();
                }

                // 取得新增資料的 ID
                using (SqliteCommand cmd = new SqliteCommand("SELECT last_insert_rowid()", conn))
                {
                    return Convert.ToInt32(cmd.ExecuteScalar());
                }
            }
            catch (Exception ex)
            {
                throw new Exception($"新增 SignUps 資料失敗：{ex.Message}", ex);
            }
        }

        /// <summary>
        /// 更新一筆 SignUps 資料
        /// </summary>
        public bool Update(LocalSignUpItem item)
        {
            try
            {
                var conn = _dbService.GetConnection();
                string sql = @"
                    UPDATE SignUps SET
                        CourseID = @CourseID,
                        SeqNo = @SeqNo,
                        Name = @Name,
                        Mobile = @Mobile,
                        QRCode = @QRCode,
                        SignUpType = @SignUpType,
                        IDNumber = @IDNumber,
                        IDType = @IDType,
                        MealType = @MealType,
                        Email = @Email,
                        LossJobTimes = @LossJobTimes,
                        Gender = @Gender,
                        AgreementStatus = @AgreementStatus,
                        CheckInTime = @CheckInTime,
                        CheckOutTime = @CheckOutTime,
                        UpdatedAt = @UpdatedAt
                    WHERE ID = @ID
                ";

                using (SqliteCommand cmd = new SqliteCommand(sql, conn))
                {
                    cmd.Parameters.AddWithValue("@ID", item.ID);
                    cmd.Parameters.AddWithValue("@CourseID", item.CourseID);
                    cmd.Parameters.AddWithValue("@SeqNo", item.SeqNo);
                    cmd.Parameters.AddWithValue("@Name", item.Name ?? (object)DBNull.Value);
                    cmd.Parameters.AddWithValue("@Mobile", item.Mobile ?? (object)DBNull.Value);
                    cmd.Parameters.AddWithValue("@QRCode", item.QRCode ?? (object)DBNull.Value);
                    cmd.Parameters.AddWithValue("@SignUpType", item.SignUpType ?? (object)DBNull.Value);
                    cmd.Parameters.AddWithValue("@IDNumber", item.IDNumber ?? (object)DBNull.Value);
                    cmd.Parameters.AddWithValue("@IDType", item.IDType ?? (object)DBNull.Value);
                    cmd.Parameters.AddWithValue("@MealType", item.MealType ?? (object)DBNull.Value);
                    cmd.Parameters.AddWithValue("@Email", item.Email ?? (object)DBNull.Value);
                    cmd.Parameters.AddWithValue("@LossJobTimes", item.LossJobTimes.HasValue ? (object)item.LossJobTimes.Value : DBNull.Value);
                    cmd.Parameters.AddWithValue("@Gender", item.Gender ?? (object)DBNull.Value);
                    cmd.Parameters.AddWithValue("@AgreementStatus", item.AgreementStatus ?? (object)DBNull.Value);
                    cmd.Parameters.AddWithValue("@CheckInTime", item.CheckInTime ?? (object)DBNull.Value);
                    cmd.Parameters.AddWithValue("@CheckOutTime", item.CheckOutTime ?? (object)DBNull.Value);
                    cmd.Parameters.AddWithValue("@UpdatedAt", DateTime.Now);

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

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

                using (SqliteCommand cmd = new SqliteCommand(sql, conn))
                {
                    cmd.Parameters.AddWithValue("@ID", id);
                    return cmd.ExecuteNonQuery() > 0;
                }
            }
            catch (Exception ex)
            {
                throw new Exception($"刪除 SignUps 資料失敗：{ex.Message}", ex);
            }
        }

        /// <summary>
        /// 查詢所有 SignUps 資料
        /// </summary>
        public List<LocalSignUpItem> GetAll()
        {
            return Query("SELECT * FROM SignUps ORDER BY CourseID DESC, ID ASC");
        }

        /// <summary>
        /// 查詢單筆 SignUps 資料
        /// </summary>
        public LocalSignUpItem GetById(int id)
        {
            var result = Query($"SELECT * FROM SignUps WHERE ID = {id}");
            return result.Count > 0 ? result[0] : null;
        }

        /// <summary>
        /// 透過 QRCode 查詢
        /// </summary>
        public LocalSignUpItem GetByQRCode(string qrCode)
        {
            try
            {
                var conn = _dbService.GetConnection();
                string sql = "SELECT * FROM SignUps WHERE QRCode = @QRCode LIMIT 1";

                using (SqliteCommand cmd = new SqliteCommand(sql, conn))
                {
                    cmd.Parameters.AddWithValue("@QRCode", qrCode);

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

                return null;
            }
            catch (Exception ex)
            {
                throw new Exception($"按 QRCode 查詢失敗：{ex.Message}", ex);
            }
        }

        /// <summary>
        /// 按課程和姓名手機查詢
        /// </summary>
        public LocalSignUpItem GetByCourseNameMobile(int courseID, string name, string mobile)
        {
            try
            {
                var conn = _dbService.GetConnection();
                string sql = "SELECT * FROM SignUps WHERE CourseID = @CourseID";

                using (SqliteCommand cmd = new SqliteCommand())
                {
                    cmd.Parameters.AddWithValue("@CourseID", courseID);
                    if (!string.IsNullOrEmpty(name))
                    {
                        sql += " AND Name = @Name";
                        cmd.Parameters.AddWithValue("@Name", name);
                    }
                    if (!string.IsNullOrEmpty(mobile))
                    {
                        sql += " AND Mobile = @Mobile";
                        cmd.Parameters.AddWithValue("@Mobile", mobile);
                    }
                    sql += " LIMIT 1";

                    cmd.Connection = conn;
                    cmd.CommandText = sql;

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

                return null;
            }
            catch (Exception ex)
            {
                throw new Exception($"按課程和姓名手機查詢失敗：{ex.Message}", ex);
            }
        }

        /// <summary>
        /// 條件查詢 SignUps 資料（分頁）
        /// </summary>
        public List<LocalSignUpItem> GetByCondition(int pageIndex, int pageSize, int courseID = 0, string name = "", string mobile = "")
        {
            try
            {
                var conn = _dbService.GetConnection();
                string sql = "SELECT * FROM SignUps WHERE 1=1";

                if (courseID > 0)
                    sql += " AND CourseID = @CourseID";

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

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

                sql += " ORDER BY CourseID DESC, ID ASC LIMIT @PageSize OFFSET @Offset";

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

                using (SqliteCommand cmd = new SqliteCommand(sql, conn))
                {
                    if (courseID > 0)
                        cmd.Parameters.AddWithValue("@CourseID", courseID);

                    if (!string.IsNullOrWhiteSpace(name))
                        cmd.Parameters.AddWithValue("@Name", name);

                    if (!string.IsNullOrWhiteSpace(mobile))
                        cmd.Parameters.AddWithValue("@Mobile", mobile);

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

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

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

        /// <summary>
        /// 查詢 SignUps 資料總數
        /// </summary>
        public int GetCount(int courseID = 0, string name = "", string mobile = "")
        {
            try
            {
                var conn = _dbService.GetConnection();
                string sql = "SELECT COUNT(*) FROM SignUps WHERE 1=1";

                if (courseID > 0)
                    sql += " AND CourseID = @CourseID";

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

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

                using (SqliteCommand cmd = new SqliteCommand(sql, conn))
                {
                    if (courseID > 0)
                        cmd.Parameters.AddWithValue("@CourseID", courseID);

                    if (!string.IsNullOrWhiteSpace(name))
                        cmd.Parameters.AddWithValue("@Name", name);

                    if (!string.IsNullOrWhiteSpace(mobile))
                        cmd.Parameters.AddWithValue("@Mobile", mobile);

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

        /// <summary>
        /// 按課程 ID 查詢所有報名人員
        /// </summary>
        public List<LocalSignUpItem> GetByCourseID(int courseID)
        {
            try
            {
                var conn = _dbService.GetConnection();
                string sql = "SELECT * FROM SignUps WHERE CourseID = @CourseID ORDER BY ID ASC";

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

                using (SqliteCommand cmd = new SqliteCommand(sql, conn))
                {
                    cmd.Parameters.AddWithValue("@CourseID", courseID);

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

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

        /// <summary>
        /// 按序號查詢單筆記錄
        /// </summary>
        public LocalSignUpItem GetBySeqNo(int seqNo)
        {
            try
            {
                var conn = _dbService.GetConnection();
                string sql = "SELECT * FROM SignUps WHERE SeqNo = @SeqNo LIMIT 1";

                using (SqliteCommand cmd = new SqliteCommand(sql, conn))
                {
                    cmd.Parameters.AddWithValue("@SeqNo", seqNo);

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

                return null;
            }
            catch (Exception ex)
            {
                throw new Exception($"按序號查詢失敗：{ex.Message}", ex);
            }
        }

        /// <summary>
        /// 按活動編號和序號查詢單筆記錄
        /// </summary>
        public LocalSignUpItem GetByCourseIDAndSeqNo(int courseID, int seqNo)
        {
            try
            {
                var conn = _dbService.GetConnection();
                string sql = "SELECT * FROM SignUps WHERE CourseID = @CourseID AND SeqNo = @SeqNo LIMIT 1";

                using (SqliteCommand cmd = new SqliteCommand(sql, conn))
                {
                    cmd.Parameters.AddWithValue("@CourseID", courseID);
                    cmd.Parameters.AddWithValue("@SeqNo", seqNo);

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

                return null;
            }
            catch (Exception ex)
            {
                throw new Exception($"按課程編號和序號查詢失敗：{ex.Message}", ex);
            }
        }

        /// <summary>
        /// 清除所有 SignUps 資料
        /// </summary>
        public void DeleteByCourseID(int courseID)
        {
            try
            {
                var conn = _dbService.GetConnection();
                using (SqliteCommand cmd = new SqliteCommand("DELETE FROM SignUps WHERE CourseID = @CourseID", conn))
                {
                    cmd.Parameters.AddWithValue("@CourseID", courseID);
                    cmd.ExecuteNonQuery();
                }
            }
            catch (Exception ex)
            {
                throw new Exception($"清除 SignUps 資料失敗：{ex.Message}", ex);
            }
        }

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

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

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

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

        /// <summary>
        /// 私用方法 - 讀取資料列
        /// </summary>
        private LocalSignUpItem ReadSignUpItem(SqliteDataReader reader)
        {
            return new LocalSignUpItem
            {
                ID = reader.GetInt32(reader.GetOrdinal("ID")),
                CourseID = reader.GetInt32(reader.GetOrdinal("CourseID")),
                SeqNo = reader.IsDBNull(reader.GetOrdinal("SeqNo")) ? 0 : reader.GetInt32(reader.GetOrdinal("SeqNo")),
                Name = reader.IsDBNull(reader.GetOrdinal("Name")) ? null : reader.GetString(reader.GetOrdinal("Name")),
                Mobile = reader.IsDBNull(reader.GetOrdinal("Mobile")) ? null : reader.GetString(reader.GetOrdinal("Mobile")),
                QRCode = reader.IsDBNull(reader.GetOrdinal("QRCode")) ? null : reader.GetString(reader.GetOrdinal("QRCode")),
                SignUpType = reader.IsDBNull(reader.GetOrdinal("SignUpType")) ? null : reader.GetString(reader.GetOrdinal("SignUpType")),
                IDNumber = reader.IsDBNull(reader.GetOrdinal("IDNumber")) ? null : reader.GetString(reader.GetOrdinal("IDNumber")),
                IDType = reader.IsDBNull(reader.GetOrdinal("IDType")) ? null : reader.GetString(reader.GetOrdinal("IDType")),
                MealType = reader.IsDBNull(reader.GetOrdinal("MealType")) ? null : reader.GetString(reader.GetOrdinal("MealType")),
                Email = reader.IsDBNull(reader.GetOrdinal("Email")) ? null : reader.GetString(reader.GetOrdinal("Email")),
                LossJobTimes = reader.IsDBNull(reader.GetOrdinal("LossJobTimes")) ? null : (int?)reader.GetInt32(reader.GetOrdinal("LossJobTimes")),
                Gender = reader.IsDBNull(reader.GetOrdinal("Gender")) ? null : reader.GetString(reader.GetOrdinal("Gender")),
                AgreementStatus = reader.IsDBNull(reader.GetOrdinal("AgreementStatus")) ? null : reader.GetString(reader.GetOrdinal("AgreementStatus")),
                CheckInTime = reader.IsDBNull(reader.GetOrdinal("CheckInTime")) ? null : reader.GetString(reader.GetOrdinal("CheckInTime")),
                CheckOutTime = reader.IsDBNull(reader.GetOrdinal("CheckOutTime")) ? null : reader.GetString(reader.GetOrdinal("CheckOutTime")),
                CreatedAt = reader.GetDateTime(reader.GetOrdinal("CreatedAt")),
                UpdatedAt = reader.GetDateTime(reader.GetOrdinal("UpdatedAt"))
            };
        }
    }
}