using System.Linq;
using CMSMicroservice.Protobuf.Protos.SitePage;
using CMSMicroservice.WebApi.Common.Services;
using CMSMicroservice.Application.SitePageCQ.Commands.CreateSitePage;
using CMSMicroservice.Application.SitePageCQ.Commands.DeleteSitePage;
using CMSMicroservice.Application.SitePageCQ.Commands.UpdateSitePage;
using CMSMicroservice.Application.SitePageCQ.Commands.CreateSitePageSection;
using CMSMicroservice.Application.SitePageCQ.Commands.UpdateSitePageSection;
using CMSMicroservice.Application.SitePageCQ.Commands.DeleteSitePageSection;
using CMSMicroservice.Application.SitePageCQ.Commands.ReorderSitePageSections;
using CMSMicroservice.Application.SitePageCQ.Queries.GetSitePage;
using CMSMicroservice.Application.SitePageCQ.Queries.GetSitePageByKey;
using CMSMicroservice.Application.SitePageCQ.Queries.GetAllSitePages;
using Google.Protobuf.WellKnownTypes;
using Grpc.Core;
using MediatR;

namespace CMSMicroservice.WebApi.Services;

public class SitePageService : SitePageContract.SitePageContractBase
{
    private readonly ISender _sender;
    private readonly IDispatchRequestToCQRS _dispatchRequestToCQRS;

    public SitePageService(ISender sender, IDispatchRequestToCQRS dispatchRequestToCQRS)
    {
        _sender = sender;
        _dispatchRequestToCQRS = dispatchRequestToCQRS;
    }

    public override async Task<GetSitePageResponse> GetSitePage(GetSitePageRequest request, ServerCallContext context)
    {
        var query = new GetSitePageQuery { Id = request.Id };
        var result = await _sender.Send(query, context.CancellationToken);
        return MapToResponse(result);
    }

    public override async Task<GetSitePageResponse> GetSitePageByKey(GetSitePageByKeyRequest request, ServerCallContext context)
    {
        var query = new GetSitePageByKeyQuery { PageKey = request.PageKey };
        var result = await _sender.Send(query, context.CancellationToken);
        return MapToResponse(result);
    }

    public override async Task<Empty> UpdateSitePage(UpdateSitePageRequest request, ServerCallContext context)
    {
        var command = new UpdateSitePageCommand
        {
            Id = request.Id,
            Title = request.Title,
            MetaDescription = request.MetaDescription,
            HeroTitle = request.HeroTitle,
            HeroSubtitle = request.HeroSubtitle,
            HeroImagePath = request.HeroImagePath,
            IsActive = request.IsActive,
            ImageFileBytes = request.ImageFile?.File?.ToByteArray(),
            ImageFileMime = request.ImageFile?.Mime,
            ImageFileName = request.ImageFile?.FileName
        };

        await _sender.Send(command, context.CancellationToken);
        return new Empty();
    }

    public override async Task<CreateSitePageResponse> CreateSitePage(CreateSitePageRequest request, ServerCallContext context)
    {
        var command = new CreateSitePageCommand
        {
            PageKey = request.PageKey,
            Title = request.Title,
            MetaDescription = request.MetaDescription,
            HeroTitle = request.HeroTitle,
            HeroSubtitle = request.HeroSubtitle,
            IsActive = request.IsActive,
            ImageFileBytes = request.ImageFile?.File?.ToByteArray(),
            ImageFileMime = request.ImageFile?.Mime,
            ImageFileName = request.ImageFile?.FileName
        };

        var id = await _sender.Send(command, context.CancellationToken);
        return new CreateSitePageResponse { Id = id };
    }

    public override async Task<Empty> DeleteSitePage(DeleteSitePageRequest request, ServerCallContext context)
    {
        var command = new DeleteSitePageCommand { Id = request.Id };
        await _sender.Send(command, context.CancellationToken);
        return new Empty();
    }

    public override async Task<GetAllSitePagesResponse> GetAllSitePages(GetAllSitePagesRequest request, ServerCallContext context)
    {
        var query = new GetAllSitePagesQuery();
        var result = await _sender.Send(query, context.CancellationToken);

        var response = new GetAllSitePagesResponse();
        foreach (var item in result)
        {
            response.Pages.Add(new SitePageSummary
            {
                Id = item.Id,
                PageKey = item.PageKey ?? string.Empty,
                Title = item.Title ?? string.Empty,
                IsActive = item.IsActive,
                SectionCount = item.SectionCount,
                LastModified = item.LastModified.HasValue
                    ? Timestamp.FromDateTime(DateTime.SpecifyKind(item.LastModified.Value, DateTimeKind.Utc))
                    : null
            });
        }

        return response;
    }

    public override async Task<CreateSitePageSectionResponse> CreateSitePageSection(CreateSitePageSectionRequest request, ServerCallContext context)
    {
        var command = new CreateSitePageSectionCommand
        {
            SitePageId = request.SitePageId,
            SectionKey = request.SectionKey,
            Title = request.Title,
            Subtitle = request.Subtitle,
            HtmlContent = request.HtmlContent,
            IconName = request.IconName,
            ImagePath = request.ImagePath,
            IsActive = true,
            ExtraData = request.ExtraData,
            ImageFileBytes = request.ImageFile?.File?.ToByteArray(),
            ImageFileMime = request.ImageFile?.Mime,
            ImageFileName = request.ImageFile?.FileName
        };

        var result = await _sender.Send(command, context.CancellationToken);
        return new CreateSitePageSectionResponse { Id = result };
    }

    public override async Task<Empty> UpdateSitePageSection(UpdateSitePageSectionRequest request, ServerCallContext context)
    {
        var command = new UpdateSitePageSectionCommand
        {
            Id = request.Id,
            SectionKey = request.SectionKey,
            Title = request.Title,
            Subtitle = request.Subtitle,
            HtmlContent = request.HtmlContent,
            IconName = request.IconName,
            ImagePath = request.ImagePath,
            SortOrder = request.SortOrder,
            IsActive = request.IsActive,
            ExtraData = request.ExtraData,
            ImageFileBytes = request.ImageFile?.File?.ToByteArray(),
            ImageFileMime = request.ImageFile?.Mime,
            ImageFileName = request.ImageFile?.FileName
        };

        await _sender.Send(command, context.CancellationToken);
        return new Empty();
    }

    public override async Task<Empty> DeleteSitePageSection(DeleteSitePageSectionRequest request, ServerCallContext context)
    {
        return await _dispatchRequestToCQRS.Handle<DeleteSitePageSectionRequest, DeleteSitePageSectionCommand>(request, context);
    }

    public override async Task<Empty> ReorderSitePageSections(ReorderSitePageSectionsRequest request, ServerCallContext context)
    {
        var command = new ReorderSitePageSectionsCommand
        {
            Items = request.Items.Select(x => new Application.SitePageCQ.Commands.ReorderSitePageSections.SectionSortItem
            {
                Id = x.Id,
                SortOrder = x.SortOrder
            }).ToList()
        };

        await _sender.Send(command, context.CancellationToken);
        return new Empty();
    }

    // ── Private Mapping Helpers ──

    private static GetSitePageResponse MapToResponse(SitePageDto dto)
    {
        var response = new GetSitePageResponse
        {
            Id = dto.Id,
            PageKey = dto.PageKey ?? string.Empty,
            Title = dto.Title ?? string.Empty,
            MetaDescription = dto.MetaDescription,
            HeroTitle = dto.HeroTitle,
            HeroSubtitle = dto.HeroSubtitle,
            HeroImagePath = dto.HeroImagePath,
            IsActive = dto.IsActive
        };

        if (dto.Sections != null)
        {
            foreach (var s in dto.Sections)
            {
                response.Sections.Add(new SitePageSectionItem
                {
                    Id = s.Id,
                    SectionKey = s.SectionKey ?? string.Empty,
                    Title = s.Title ?? string.Empty,
                    Subtitle = s.Subtitle,
                    HtmlContent = s.HtmlContent,
                    IconName = s.IconName,
                    ImagePath = s.ImagePath,
                    SortOrder = s.SortOrder,
                    IsActive = s.IsActive,
                    ExtraData = s.ExtraData
                });
            }
        }

        return response;
    }
}