using e_suite.API.Common;
using e_suite.API.Common.exceptions;
using e_suite.API.Common.repository;
using e_suite.Database.Audit;
using e_suite.Database.Core.Extensions;
using e_suite.Utilities.Pagination;
using eSuite.Core.Miscellaneous;
using System.Linq.Expressions;
using e_suite.Modules.WorkflowTemplatesManager.Repository;

//using WorkflowVersion = e_suite.Workflow.Core.WorkflowVersion;

namespace e_suite.Modules.WorkflowTemplatesManager;

public class WorkflowTemplateManager : IWorkflowTemplateManager
{
    private readonly IWorkflowTemplateRepository _workflowTemplateRepository;
    private readonly IWorkflowConverter _workflowConverter;
    private readonly IDomainRepository _domainRepository;
    private readonly IPatchFactory _patchFactory;

    public WorkflowTemplateManager(IWorkflowTemplateRepository workflowTemplateRepository, IPatchFactory patchFactory, IDomainRepository domainRepository)
    {
        _workflowTemplateRepository = workflowTemplateRepository;
        _patchFactory = patchFactory;
        _domainRepository = domainRepository;
    }

    public async Task<PaginatedData<GetWorkflowTemplate>> GetWorkflowTemplatesAsync(Paging paging, CancellationToken cancellationToken)
    {
        var ssoProviders = _workflowTemplateRepository.GetWorkflows().Where(x => x.Deleted == false);

        var paginatedData = await PaginatedData.Paginate<e_suite.Database.Core.Tables.Workflow.Workflow, GetWorkflowTemplate>(ssoProviders, paging,
            WorkflowKeySelector, cancellationToken);

        return paginatedData;
    }

    private Expression<Func<e_suite.Database.Core.Tables.Workflow.Workflow, object>> WorkflowKeySelector(string sortKey)
    {
        return sortKey?.ToLowerInvariant() switch
        {
            "id" => x => x.Id,
            "guid" => x => x.Guid,
            "name" => x => x.Name,
            "lastupdated" => x => x.LastUpdated,
            _ => x => x.Id
        };
    }

    public async Task<PaginatedData<GetWorkflowTemplateVersion>> GetWorkflowTemplateVersionsAsync(Paging paging, CancellationToken cancellationToken)
    {
        var ssoProviders = _workflowTemplateRepository.GetWorkflowVersions().Where(x => x.Deleted == false);

        var paginatedData = await PaginatedData.Paginate<e_suite.Database.Core.Tables.Workflow.WorkflowVersion, GetWorkflowTemplateVersion>(ssoProviders, paging,
            KeySelector, cancellationToken);

        return paginatedData;
    }
    
    private Expression<Func<e_suite.Database.Core.Tables.Workflow.WorkflowVersion, object>> KeySelector(string sortKey)
    {
        return sortKey?.ToLowerInvariant() switch
        {
            "id" => x => x.Id,
            "activitynametemplate" => x => x.ActivityNameTemplate,
            "description" => x => x.Description,
            "domain.name" => x => x.Domain.Name,
            "workflow.name" => x => x.Workflow.Name,
            _ => x => x.Id
        };
    }

    public async Task<GetWorkflowTemplateVersion?> GetWorkflowTemplateVersionAsync(GeneralIdRef generalIdRef, CancellationToken cancellationToken)
    {
        var dbWorkflowTemplate = await _workflowTemplateRepository.GetWorkflowVersions().FindByGeneralIdRefAsync(generalIdRef, cancellationToken) ?? throw new NotFoundException("Unable to find Workflow Version");
        //var workflowTemplate = _workflowConverter.DeserialiseFromDatabase(dbWorkflowTemplate);

        return new GetWorkflowTemplateVersion(dbWorkflowTemplate);
    }

    public async Task EditTemplateVersion(
        AuditUserDetails auditUserDetails,
        EditWorkflowTemplateVersion template,
        CancellationToken cancellationToken
    )
    {
        await AlterWorkflowTemplateVersionAsync(auditUserDetails, template.ToGeneralIdRef()!, async version =>
        {
            var domain = await _domainRepository.GetDomainById(template.DomainId!, cancellationToken) ?? throw new NotFoundException("Unable to find Domain with provided id");

            version.Domain = domain;
            version.DomainId = domain.Id;
            version.Description = template.Description;
            version.ActivityNameTemplate = template.ActivityNameTemplate;
            version.Deleted = false;
            version.Version = template.Version;
            version.Tasks = template.Tasks;
        }, cancellationToken);
    }

    public async Task PatchTemplateVersion(
        AuditUserDetails auditUserDetails,
        IGeneralIdRef templateId,
        PatchWorkflowTemplateVersion patchTemplate,
        CancellationToken cancellationToken
    )
    {
        var patch = _patchFactory.Create(patchTemplate);
        await AlterWorkflowTemplateVersionAsync(auditUserDetails, templateId, async version =>
        {
            await patch.ApplyTo(version);
        }, cancellationToken);
    }

    public async Task PostTemplateVersion(
        AuditUserDetails auditUserDetails,
        CreateWorkflowTemplateVersion template,
        CancellationToken cancellationToken
    )
    {

        //var workflowTemplate = _workflowConverter.DeserialiseFromDatabase(dbWorkflowTemplate);

        throw new NotImplementedException();
    }

    public async Task DeleteTemplateVersion(AuditUserDetails auditUserDetails, IGeneralIdRef templateId, CancellationToken cancellationToken)
    {
        await AlterWorkflowTemplateVersionAsync(auditUserDetails, templateId, async version =>
        {
            version.Deleted = true;
        }, cancellationToken);
    }

    private async Task AlterWorkflowTemplateVersionAsync(
        AuditUserDetails auditUserDetails,
        IGeneralIdRef generalIdRef,
        Func<e_suite.Database.Core.Tables.Workflow.WorkflowVersion, Task> applyChanges,
        CancellationToken cancellationToken
    )
    {
        await _workflowTemplateRepository.TransactionAsync(async () =>
        {
            var workflowVersion = await _workflowTemplateRepository.GetWorkflowVersions().FindByGeneralIdRefAsync(generalIdRef, cancellationToken) ?? throw new NotFoundException("SsoProvider with this id does not exists");

            await applyChanges(workflowVersion);

            await _workflowTemplateRepository.EditWorkflowVersionAsync(auditUserDetails, workflowVersion, cancellationToken);
        });
    }
}