using LCU.Library.Internal.IncentiveApiModels.Entities;
using LCU.Library.Internal.IncentiveApiModels.Enums;
using LCU.API.Internal.Operations.IncentiveApiLib.Repositories;
using LCU.Library.Internal.IncentiveApiModels.Common;

namespace LCU.API.Internal.Operations.IncentiveApi.Services;

public class AuthorizationService : IAuthorizationService
{
    private readonly IDepartmentRepository _departmentRepository;
    private readonly IUserAssignmentRepository _userAssignmentRepository;

    public AuthorizationService(IDepartmentRepository departmentRepository, IUserAssignmentRepository userAssignmentRepository)
    {
        _departmentRepository = departmentRepository;
        _userAssignmentRepository = userAssignmentRepository;
    }

    public async Task<bool> AppUserCanMakeStateChange(AppUser appUser, Activity activity, ActivityState targetState, int targetDepartmentId = 0)
    {
        if (appUser.HasRoleAnywhere(Role.Admin))
        {
            return await Task.FromResult(true);
        }

        targetDepartmentId = targetDepartmentId == 0 ? activity.DepartmentId : targetDepartmentId;
        var targetDepartmentAppUserPermissions = appUser.ActiveDepartmentsForRange(new MonthRange())
            .FirstOrDefault(x => x.DepartmentId == targetDepartmentId)
            ?.Role.Permissions.ToList();

        if (appUser.AdditionalPermissions != null && targetDepartmentAppUserPermissions == null)
        {
                targetDepartmentAppUserPermissions = new List<Permission>();
                targetDepartmentAppUserPermissions.AddRange(appUser.AdditionalPermissions.Select(x => x.Permission));
        } else if (appUser.AdditionalPermissions != null)
        {
                targetDepartmentAppUserPermissions.AddRange(appUser.AdditionalPermissions.Select(x => x.Permission));                
        }

        if (targetDepartmentAppUserPermissions == null || activity.State == targetState)
        {
            return await Task.FromResult(false);
        }

        var canExecuteChange = activity.State switch
        {
            ActivityState.Accepted => targetState switch
            {
                ActivityState.ManualReview => targetDepartmentAppUserPermissions.Contains(Permission.SetActivityToManualReviewFromAccepted),
                ActivityState.Rejected => targetDepartmentAppUserPermissions.Contains(Permission.SetActivityToRejectedFromAccepted),
                _ => false
            },
            ActivityState.ManualReview => targetState switch
            {
                ActivityState.Accepted => targetDepartmentAppUserPermissions.Contains(Permission.SetActivityToAcceptedFromManualReview),
                ActivityState.Rejected => targetDepartmentAppUserPermissions.Contains(Permission.SetActivityToRejectedFromManualReview),
                _ => false
            },
            ActivityState.PendingTransfer => targetState switch
            {
                ActivityState.Accepted => targetDepartmentAppUserPermissions.Contains(Permission.SetActivityToAcceptedFromPendingTransfer),
                ActivityState.Transferred => targetDepartmentAppUserPermissions.Contains(Permission.SetActivityToTransferredFromPendingTransfer),
                _ => false
            },
            ActivityState.Rejected => targetState switch
            {
                ActivityState.Accepted => targetDepartmentAppUserPermissions.Contains(Permission.SetActivityToAcceptedFromRejected),
                ActivityState.ManualReview => targetDepartmentAppUserPermissions.Contains(Permission.SetActivityToManualReviewFromRejected),
                _ => false
            },
            _ => false
        };

        return canExecuteChange;
    }

    public async Task<bool> AppUserCanViewReport(AppUser appUser, string permissionCode)
    {
        if (appUser.HasRoleAnywhere(Role.Admin))
        {
            return await Task.FromResult(true);
        }

        var requiredPermission = Permission.LookupPermissionFromCode(permissionCode);

        return appUser.UserHasPermission(requiredPermission);
    }

    public async Task<bool> ValidateHierarchicalDepartmentPermission(
        AppUser appUser,
        IReadOnlyCollection<Role> allowedDirectRoles,
        int departmentId
    )
    {
        return
            appUser.HasRoleAnywhere(Role.Admin)
              || appUser.HasAnyRoleForActiveDepartment(departmentId, allowedDirectRoles.ToArray())
              || await ValidateIsBusinessLineManager(appUser, departmentId)
              || await ValidateIsRegionalManager(appUser, departmentId);
    }

    public async Task<bool> ValidateIsBusinessLineManager(AppUser appUser, int departmentId)
    {
        var userDept = appUser.FindDepartmentForRole(Role.BusinessLineManager);
        if (userDept != null && userDept.Department != null)
        {
            var bl = BusinessLine.FindByCode(userDept.Department.BusinessLineCode);
            if (bl == null)
            {
                return userDept.Department.Id == departmentId;
            }

            var departments = await _departmentRepository.FindDepartmentsByBusinessLineAsync(bl);
            if (departments.Select(x => x.Id).Contains(departmentId))
            {
                return true;
            }
        }

        return false;
    }

    public async Task<bool> ValidateIsRegionalManager(AppUser appUser, int departmentId)
    {
        var userDept = appUser.FindDepartmentForRole(Role.RegionalManager);
        if (userDept != null && userDept.Department != null)
        {
            var userAssign = await _userAssignmentRepository.IsUserAssigned(AssignmentType.RegionalManager, appUser);
            Region rc = null;
            if (userAssign != null)
            {
                rc = Region.FindByCode(userAssign.Key);
            }

            if (rc == null)
            {
                rc = Region.FindByCode(userDept.Department.RegionCode);
                if (rc == null)
                {
                    return userDept.Department.Id == departmentId;
                }
            }

            var departments = await _departmentRepository.FindDepartmentsByRegionAsync(rc);
            if (departments.Select(x => x.Id).Contains(departmentId))
            {
                return true;
            }
        }

        return false;
    }
}