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

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

public class GoalRepository : BaseRepository, IGoalRepository
{
    public GoalRepository(IApplicationDbContext context) : base(context)
    {
    }

    public async Task<int> SaveGoalAsync(Goal goalChange)
    {
        await _context.Goals.AddAsync(goalChange);
        return goalChange.Id;
    }

    public async Task<IReadOnlyCollection<Goal>> GetGoalsAsync(GoalSearchRequest goalSearchRequest)
    {
        var result = _context.Goals.AsQueryable();

        if (goalSearchRequest != null)
        {
            if (goalSearchRequest.departmentId.HasValue)
            {
                result = result.Where(x => x.DepartmentId == goalSearchRequest.departmentId);
            }

            if (goalSearchRequest.DateRange != null && goalSearchRequest.DateRange.ValidFromRange)
            {
                var fromDate = goalSearchRequest.DateRange.StartTime;
                result = result.Where(x => x.StartDate.Date >= fromDate.Date);
            }

            if (goalSearchRequest.DateRange != null && goalSearchRequest.DateRange.ValidToRange)
            {
                var toDate = goalSearchRequest.DateRange.EndTime;
                result = result.Where(x => x.EndDate.Date <= toDate.Date);
            }

            if (goalSearchRequest.IncludePersonnel)
            {
                result = result.Where(x => x.EmployeeId != null);
            }
            else
            {
                result = result.Where(x => x.EmployeeId == null);
            }
        }

        return await result.OrderBy(t => t.Id).ToListAsync();
    }

    public async Task<Goal> FindExistingGoal(GoalChange goalChange)
    {
        return await _context.Goals.FirstOrDefaultAsync(x => x.Product == goalChange.Product &&
                                                             x.StartDate.Date == goalChange.StartDate.Date &&
                                                             x.EndDate.Date == goalChange.EndDate.Date &&
                                                             x.DepartmentId == goalChange.DepartmentId &&
                                                             x.EmployeeId == goalChange.PersonId);
    }

    public async Task<ICollection<Goal>> FindDepartmentGoals(int departmentId, DateTime start, DateTime end)
    {
        return await _context.Goals.Where(x => x.StartDate.Date >= start.Date &&
                                                             x.EndDate.Date <= end.Date &&
                                                             x.EmployeeId == null &&
                                                             x.DepartmentId == departmentId).ToListAsync();
    }

    public async Task<ICollection<Goal>> FindAnnualDepartmentGoals(int departmentId, int year)
    {
        return await _context.Goals.Where(x => x.StartDate.Year == year &&
                                                             x.EndDate.Year == year &&
                                                             x.EmployeeId == null &&
                                                             x.DepartmentId == departmentId).ToListAsync();
    }

    public async Task<ICollection<Goal>> FindPersonnelGoals(int departmentId, List<AppUser> users, DateTime start,
        DateTime end)
    {
        var employeeIds = users.Select(user => user.EmployeeId).ToList();
        return await _context.Goals.Where(x => x.StartDate.Date == start.Date &&
                                               x.EndDate.Date == end.Date &&
                                               x.DepartmentId == departmentId &&
                                               employeeIds.Contains(x.EmployeeId)).ToListAsync();
    }

    public async Task<ICollection<Goal>> FindMonthlyPersonnelGoals(int departmentId, List<AppUser> users, int year,
        int month)
    {
        var employeeIds = users.Select(user => user.EmployeeId).ToList();
        return await _context.Goals.Where(x => x.StartDate.Year == year && x.StartDate.Month == month &&
                                               x.EndDate.Year == year && x.EndDate.Month == month &&
                                               x.DepartmentId == departmentId &&
                                               employeeIds.Contains(x.EmployeeId)).ToListAsync();
    }

    public async Task<ICollection<Goal>> FindPersonnelGoalsByMonthRange(int departmentId, List<AppUser> users, MonthRange monthRange)
    {
        var employeeIds = users.Select(user => user.EmployeeId).ToList();
        return await _context.Goals.AsNoTracking().Where(x => x.StartDate.Date >= monthRange.StartTime.Date &&
                                               x.EndDate.Date <= monthRange.EndTime.Date &&
                                               x.DepartmentId == departmentId &&
                                               employeeIds.Contains(x.EmployeeId)).ToListAsync();
    }

    public async Task<ICollection<Goal>> FindPersonnelGoalsByMonthRange(int departmentId, List<string> employeeIds, MonthRange monthRange)
    {
        return await _context.Goals.Where(x => x.StartDate.Date >= monthRange.StartTime.Date &&
                                               x.EndDate.Date <= monthRange.EndTime.Date &&
                                               x.DepartmentId == departmentId &&
                                               employeeIds.Contains(x.EmployeeId)).ToListAsync();
    }

    public async Task<ICollection<Goal>> FindDepartmentGoalsByMonthRange(int departmentId, MonthRange monthRange)
    {
        return await _context.Goals.AsNoTracking().Where(x => x.StartDate.Date >= monthRange.StartTime.Date &&
                                               x.EndDate.Date <= monthRange.EndTime.Date &&
                                               x.EmployeeId == null &&
                                               x.DepartmentId == departmentId).ToListAsync();
    }
}