using System;
using System.Collections.Generic;
using LiteDB;
using skydiveLogs_api.Domain;
using skydiveLogs_api.DomainService.Repositories;
using skydiveLogs_api.Infrastructure.Interfaces;

namespace skydiveLogs_api.Infrastructure
{
    /// <summary>
    /// Repository class for managing jump data in the database.
    /// Provides operations to add, delete, retrieve, and update jump records per user.
    /// </summary>
    /// <remarks>
    /// This repository interacts with LiteDB to perform CRUD operations on jump records.
    /// Each jump record is associated with a user, aircraft, drop zone, gear, and jump type.
    /// Navigation properties are included for related entities to enable eager loading.
    /// </remarks>
    public class JumpRepository : IJumpRepository
    {
        #region Public Constructors

        /// <summary>
        /// Initializes a new instance of the <see cref="JumpRepository"/> class.
        /// </summary>
        /// <param name="dataProvider">The data provider used for database access operations.</param>
        /// <remarks>
        /// This constructor initializes the repository with a reference to the data provider
        /// and sets up the collection for jump data operations.
        /// The data provider manages the underlying LiteDatabase connection and provides
        /// typed collection accessors for different entity types.
        /// </remarks>
        public JumpRepository(IDataProvider dataProvider)
        {
            _dataProvider = dataProvider;
            _col = _dataProvider.CollOfJump;
        }

        #endregion Public Constructors

        #region Public Methods

        /// <summary>
        /// Adds a new jump record to the database.
        /// </summary>
        /// <param name="newJump">The jump instance to insert into the database.</param>
        /// <returns>The number of rows affected. Returns 0 if the insert operation failed.</returns>
        /// <remarks>
        /// Attempts to insert the new jump record into the database using LiteDB.
        /// The jump record should have all required properties set before insertion.
        /// If an exception occurs during insertion, the method returns 0.
        /// The returned value indicates the number of records affected by the insert operation.
        /// </remarks>
        public int Add(Jump newJump)
        {
            int result;

            try
            {
                var tmp = _col.Insert(newJump);
                result = tmp.AsInt32;
            }
            catch
            {
                result = 0;
            }

            return result;
        }

        /// <summary>
        /// Deletes a jump record by its unique identifier.
        /// </summary>
        /// <param name="id">The unique identifier of the jump to delete.</param>
        /// <returns><see langword="true"/> if the deletion was successful; otherwise, <see langword="false"/>.</returns>
        /// <remarks>
        /// Deletes the jump record with the specified ID from the database.
        /// The method uses the <see cref="ILiteCollection{T}.Delete"/> method to remove the record.
        /// </remarks>
        public bool DeleteById(int id)
        {
            return _col.Delete(new BsonValue(id));
        }

        /// <summary>
        /// Retrieves all jump records for a specific user.
        /// </summary>
        /// <param name="user">The user whose jump records to retrieve.</param>
        /// <returns>An enumerable collection containing all jump records belonging to the specified user.</returns>
        /// <remarks>
        /// Queries the jump collection and retrieves all records where the user ID matches the provided user.
        /// Each returned jump record includes navigation properties to the associated aircraft, drop zone,
        /// gear, and jump type entities for eager loading.
        /// Returns an empty collection if the user has no jump records.
        /// </remarks>
        public IEnumerable<Jump> GetAll(User user)
        {
            return _col.Include(x => x.Aircraft)
                       .Include(x => x.DropZone)
                       .Include(x => x.Gear)
                       .Include(x => x.JumpType)
                       .Find(j => j.User.Id == user.Id);
        }

        /// <summary>
        /// Retrieves all jump records from the database.
        /// </summary>
        /// <returns>An enumerable collection containing all jump records stored in the database.</returns>
        /// <remarks>
        /// This method is not currently implemented and throws a <see cref="NotImplementedException"/> when called.
        /// Implement this method to retrieve all jump records from the database without filtering.
        /// </remarks>
        /// <exception cref="NotImplementedException">Thrown when the method is called.</exception>
        public IEnumerable<Jump> GetAll()
        {
            throw new NotImplementedException();
        }

        /// <summary>
        /// Retrieves a range of jump records for a specific user with pagination.
        /// </summary>
        /// <param name="user">The user whose jump records to retrieve.</param>
        /// <param name="beginIndex">The starting index for pagination (inclusive).</param>
        /// <param name="endIndex">The ending index for pagination (exclusive).</param>
        /// <returns>An enumerable collection containing the requested range of jump records.</returns>
        /// <remarks>
        /// Retrieves a paginated range of jump records for the specified user, ordered by jump date in descending order.
        /// Uses LiteDB query operators to limit and offset the results for efficient pagination.
        /// Each jump record includes navigation properties to related entities.
        /// </remarks>
        public IEnumerable<Jump> GetBetweenIndex(User user, int beginIndex, int endIndex)
        {
            return _col.Include(x => x.Aircraft)
                       .Include(x => x.DropZone)
                       .Include(x => x.Gear)
                       .Include(x => x.JumpType)
                       .Query()
                       .OrderByDescending(j => j.JumpDate)
                       .Where(j => j.User.Id == user.Id)
                       .Limit(endIndex - beginIndex)
                       .Offset(beginIndex)
                       .ToList();
        }

        /// <summary>
        /// Retrieves a jump record by its unique identifier.
        /// </summary>
        /// <param name="id">The unique identifier of the jump to retrieve.</param>
        /// <returns>The jump record instance if found, otherwise null.</returns>
        /// <remarks>
        /// Searches the jump collection for a record with the specified ID.
        /// Returns null if no jump record with the matching ID is found in the database.
        /// </remarks>
        public Jump GetById(int id)
        {
            return _col.FindById(new BsonValue(id));
        }

        /// <summary>
        /// Gets the total count of jump records for a specific user.
        /// </summary>
        /// <param name="user">The user whose jump records to count.</param>
        /// <returns>The total number of jump records for the specified user.</returns>
        /// <remarks>
        /// This method is not currently implemented and throws a <see cref="NotImplementedException"/> when called.
        /// Implement this method to retrieve the count of jump records per user.
        /// </remarks>
        /// <exception cref="NotImplementedException">Thrown when the method is called.</exception>
        public int GetCount(User user)
        {
            return _col.Count(j => j.User.Id == user.Id);
        }

        /// <summary>
        /// Gets the total count of jump records in the database.
        /// </summary>
        /// <returns>The total number of jump records stored in the database.</returns>
        /// <remarks>
        /// This method is not currently implemented and throws a <see cref="NotImplementedException"/> when called.
        /// Implement this method to retrieve the count of all jump records.
        /// </remarks>
        /// <exception cref="NotImplementedException">Thrown when the method is called.</exception>
        public int GetCount()
        {
            throw new NotImplementedException();
        }

        /// <summary>
        /// Updates an existing jump record in the database.
        /// </summary>
        /// <param name="updatedJump">The jump record instance containing the updated data.</param>
        /// <returns><see langword="true"/> if the update was successful; otherwise, <see langword="false"/>.</returns>
        /// <remarks>
        /// Updates the jump record in the database with the provided jump record instance.
        /// The jump record must have a valid ID to be updated.
        /// The method returns the result of the underlying LiteDB update operation.
        /// If the jump record does not exist, the update operation will return 0.
        /// </remarks>
        public bool Update(Jump updatedJump)
        {
            return _col.Update(updatedJump);
        }

        #endregion Public Methods

        #region Private Fields

        /// <summary>
        /// The LiteDB collection for jump records.
        /// </summary>
        private readonly ILiteCollection<Jump> _col;

        /// <summary>
        /// The data provider used for database access operations.
        /// </summary>
        private readonly IDataProvider _dataProvider;

        #endregion Private Fields
    }
}