using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using LCU.API.Internal.Operations.IncentiveApiLib.Persistence;
using LCU.Library.Internal.IncentiveApiModels.Common;
using LCU.Library.Internal.IncentiveApiModels.Entities;
using LCU.Library.Internal.IncentiveApiModels.Enums;
using LCU.Library.Internal.IncentiveApiModels.Requests;
using Microsoft.EntityFrameworkCore;

namespace LCU.API.Internal.Operations.IncentiveApiLib.Repositories;

public class UserRepository : BaseRepository, IUserRepository
{
    public UserRepository(IApplicationDbContext context) : base(context)
    {
    }

    public async Task<IReadOnlyCollection<UserSummary>> GetAllUserSummariesAsync()
    {
        return await _context.AppUsers
            .Select(x => new UserSummary()
            {
                EmployeeId = x.EmployeeId,
                AdEmail = x.AdEmail,
                FullName = x.FullName,
                ManagerKey = x.ManagerKey,
                Terminated = x.Terminated
            })
            .OrderBy(x => x.EmployeeId)
            .ToListAsync();
    }

    public IReadOnlyCollection<UserSummary> GetTerminatedUsersAsync(MonthRange monthRange)
    {
        if (!monthRange.IsSingleMonth)
        {
            throw new ArgumentException("Can only request terminated employees for a single month");
        }

        return _context.AppUsers
            .Where(x => x.Terminated != null
                        && x.Terminated >= monthRange.StartTime
                        && x.Terminated <= monthRange.EndTime)
            .ToList()
            .GroupJoin(_context.PayoutLineItems,
                user => user.EmployeeId,
                pli => pli.EmployeeId,
                (x, pli) => new UserSummary()
                {
                    EmployeeId = x.EmployeeId,
                    AdEmail = x.AdEmail,
                    FullName = x.FullName,
                    ManagerKey = x.ManagerKey,
                    Terminated = x.Terminated,
                    AssociatedPayouts = pli.ToList()
                })
            .OrderBy(x => x.EmployeeId)
            .ToList();
    }

    public async Task<ICollection<AppUser>> GetAllUsersAsync()
    {
        return await _context.AppUsers
            .Include(user => user.Departments)
            .ThenInclude(userDept => userDept.Department)
            .ToListAsync();
    }

    public async Task<ICollection<AppUser>> GetAllUsersToPayoutAsync(MonthRange range)
    {
        return await _context.AppUsers
            .AsNoTracking()
            .Include(user => user.Departments)
            .ThenInclude(userDept => userDept.Department)
            .Where(x => x.Terminated == null
                        && x.Departments.Any(y => y.Department.State == DepartmentState.Active
                                                  && y.StartDate.Date <= range.StartTime.Date
                                                  && (y.EndDate == null || y.EndDate >= range.EndTime.Date)))
            .Distinct()
            .ToListAsync();
    }

    public async Task<AppUser> FindUserAsync(string employeeId, string adEmail)
    {
        if (!string.IsNullOrWhiteSpace(employeeId))
        {
            return await FindUserByEmployeeIdAsync(employeeId);
        }

        return await FindUserByAdEmailAsync(adEmail);
    }

    public async Task<AppUser> FindUserByEmployeeIdAsync(string employeeId)
    {
        return await _context.AppUsers
            .Include(user => user.AdditionalPermissions)
            .Include(user => user.Departments)
            .ThenInclude(userDept => userDept.Department)
            .Include(user => user.Assignments)
            .Where(user => user.EmployeeId == employeeId)
            .OrderByDescending(user => user.Terminated)
            .FirstOrDefaultAsync();
    }

    public async Task<AppUser> FindUserByAdEmailAsync(string adEmail)
    {
        return await _context.AppUsers
            .Include(user => user.AdditionalPermissions)
            .Include(user => user.Departments)
            .ThenInclude(userDept => userDept.Department)
            .Include(user => user.Assignments)
            .Where(user => user.AdEmail.ToLower() == adEmail.ToLower())
            .OrderByDescending(user => user.Terminated)
            .FirstOrDefaultAsync();
    }

    public async Task<AppUser> FindActiveUserByEmployeeIdAsync(string employeeId)
    {
        return await _context.AppUsers
            .Include(user => user.AdditionalPermissions)
            .Include(user => user.Departments)
            .ThenInclude(userDept => userDept.Department)
            .Include(user => user.Assignments)
            .Where(user => user.EmployeeId == employeeId && user.Terminated == null)
            .FirstOrDefaultAsync();
    }

    public async Task<AppUser> FindActiveUserByAdEmailAsync(string adEmail)
    {
        return await _context.AppUsers
            .Include(user => user.AdditionalPermissions)
            .Include(user => user.Departments)
            .ThenInclude(userDept => userDept.Department)
            .Include(user => user.Assignments)
            .Where(user => user.AdEmail.ToLower() == adEmail.ToLower() && user.Terminated == null)
            .FirstOrDefaultAsync();
    }

    public async Task<ICollection<AppUser>> FindUsersByHomeDepartmentsAsync(List<string> homeDepartments)
    {
        return await _context.AppUsers.Where(user => homeDepartments.Contains(user.HomeDepartment)).ToListAsync();
    }

    public async Task<ICollection<AppUser>> FindUsersByBaseRolesAsync(List<string> baseRoles)
    {
        return await _context.AppUsers.Where(user => baseRoles.Contains(user.BaseRole)).ToListAsync();
    }

    public async Task<AppUser> SaveUserAsync(AppUser newAppUser)
    {
        await _context.AppUsers.AddAsync(newAppUser);
        return newAppUser;
    }

    public async Task<ICollection<AppUser>> SaveUserRangeAsync(List<AppUser> newUsers)
    {
        await _context.AppUsers.AddRangeAsync(newUsers);
        return newUsers;
    }

    public async Task<ICollection<AppUser>> SearchUsersAsync(UserSearchRequest userSearchRequest)
    {
        var users = _context.AppUsers.Include(user => user.Departments).AsQueryable();
        if (!string.IsNullOrWhiteSpace(userSearchRequest.Query))
        {
            var cleanQuery = userSearchRequest.Query.ToLower().Trim();
            var emailQuery = BuildEmailQuery(cleanQuery);

            users = users.Where(user => user.AdEmail.ToLower().Contains(cleanQuery) ||
                                        user.AdEmail.ToLower().Contains(emailQuery) ||
                                        user.FullName.ToLower().Contains(cleanQuery) ||
                                        user.EmployeeId.ToLower().Contains(cleanQuery));
        }

        if (!string.IsNullOrWhiteSpace(userSearchRequest.FirstName))
        {
            users = users.Where(user => user.FullName.ToLower().Contains(userSearchRequest.FirstName.ToLower()));
        }

        if (!string.IsNullOrWhiteSpace(userSearchRequest.LastName))
        {
            users = users.Where(user => user.FullName.ToLower().Contains(userSearchRequest.LastName.ToLower()));
        }

        if (!string.IsNullOrWhiteSpace(userSearchRequest.MiddleInit))
        {
            users = users.Where(user => user.FullName.ToLower().EndsWith($" {userSearchRequest.MiddleInit.ToLower()}"));
        }

        if (!string.IsNullOrWhiteSpace(userSearchRequest.Role))
        {
            var foundRoles = Role.SearchRoles(userSearchRequest.Role);
            users = users.Where(user => user.Departments.Any(dept => foundRoles.Contains(dept.Role)));
        }

        if (userSearchRequest.DnaOrgNbr != null)
        {
            users = users.Where(user => user.Departments.Any(dept => dept.Department.DnaOrgNbr == userSearchRequest.DnaOrgNbr));
        }

        return await users.ToListAsync();
    }

    private string BuildEmailQuery(string cleanQuery)
    {
        if (cleanQuery.Contains(","))
        {
            var transform = cleanQuery.Split(",");
            if (transform?.Length == 2)
            {
                return transform[1].Trim() + transform[0].Trim();
            }
        }
        else if (cleanQuery.Contains(" "))
        {
            return cleanQuery.Replace(" ", "");
        }

        return cleanQuery;
    }
}