using PostFundManagement.Application.Abstractions.Services;
using PostFundManagement.Application.Services.Shared;
using PostFundManagement.Domain;
using PostFundManagement.Domain.Abstractions;
using PostFundManagement.Domain.Errors;
using PostFundManagement.Domain.Extensions;
using PostFundManagement.Domain.Models;
using PostFundManagement.Infrastructure.Database;

namespace PostFundManagement.Application.Services.Communications;

public sealed class CommunicationsService(IDbContextFactory<ApplicationDbContext> contextFactory, 
    HashService hashService, ITenantContextService tenantContext) : ICommunicationsService
{
    public async Task<Result<Invite>> SendInviteAsync(InviteRequest request, Guid userId, CancellationToken cancellationToken = default) =>
        await Result.Try((Func<Task<Result<Invite>>>)(async () =>
        {
            await using var context = await contextFactory.CreateDbContextAsync(cancellationToken);

            var recipient = await context.TenantUsers.AsNoTracking()
                .Include(i => i.User)
                .Include(i => i.Tenant)
                .FirstOrDefaultAsync(u => u.UserId == request.Recipient && u.Status == ActivityStatus.Active && u.Tenant!.Status == ActivityStatus.Active);

            if (recipient is null)
                return Result.Fail(ValidationError.Create("Tenant or User is not active, invite not sent"));

            var invite = new Domain.Entities.Invite
            {
                OrganisationId = request.OrganisationId,
                InvitedOrganisationId = request.InvitedOrganisationId,
                AwardId = request.AwardId,
                ContractId = request.ContractId,
                Recipient = recipient.UserId,
                CreatedBy = userId,
                CreatedAt = DateTime.UtcNow,
                TenantId = tenantContext.TenantId
            };

            context.Invites.Add(invite);

            var notificationRequest = new CreateNotificationRequest(request.InvitedOrganisationId, recipient.UserId, 
                request.Platform, "Funding award invite", recipient!.User!.Email, request.Message);

            var notificationResult = await CreateNotificationAsync(notificationRequest, userId, cancellationToken);

            return Result.FailIf(await context.SaveChangesAsync(cancellationToken) <= 0 && notificationResult.IsFailed, 
                CreateError.Create("Failed to create invite, contact support").CausedBy(notificationResult.Errors))
                .ToResult(invite.Map());
        }));

    public async Task<Result<Invite[]>> GetInvitesAsync(Pagination pagination, CancellationToken cancellationToken = default) =>
        await Result.Try((Func<Task<Result<Invite[]>>>)(async () =>
        {
            await using var context = await contextFactory.CreateDbContextAsync(cancellationToken);

            var invites = await context.Invites.AsNoTracking()
                .OrderByDescending(i => i.CreatedAt)
                .Skip((pagination.Page - 1) * pagination.PageSize)
                .Take(pagination.PageSize)
                .ToListAsync(cancellationToken);

            return Result.Ok(invites.Select(i => i.Map()).ToArray());
        }));

    public async Task<Result<Invite>> GetApplicantInviteAsync(Guid applicantUserId, CancellationToken cancellationToken) =>
        await Result.Try((Func<Task<Result<Invite>>>)(async () =>
        {
            await using var context = await contextFactory.CreateDbContextAsync(cancellationToken);

            var invite = await context.Invites.AsNoTracking()
                .OrderByDescending(o => o.Id)
                .FirstOrDefaultAsync(i => i.Recipient == applicantUserId, cancellationToken);

            return Result.FailIf(invite is null, NotFoundError.Create("No active invite found"))
                .ToResult(invite!.Map());
        }));

    public async Task<Result<Invite[]>> GetApplicantInvitesAsync(Guid applicantUserId, CancellationToken cancellationToken = default) =>
        await Result.Try((Func<Task<Result<Invite[]>>>)(async () =>
        {
            await using var context = await contextFactory.CreateDbContextAsync(cancellationToken);

            var invites = await context.Invites.AsNoTracking()
                .Where(i => i.Recipient == applicantUserId)
                .OrderByDescending(o => o.Id)
                .ToListAsync(cancellationToken);

            return Result.Ok(invites.Select(i => i.Map()).ToArray());
        }));

    public async Task<Result> CreateNotificationAsync(CreateNotificationRequest request, Guid userId, CancellationToken cancellationToken = default) =>
        await Result.Try((Func<Task<Result>>)(async () =>
        {
            await using var context = await contextFactory.CreateDbContextAsync(cancellationToken);

            context.Notifications.Add(new Domain.Entities.Notification
            {
                CreatedAt = DateTime.UtcNow,
                Recipient = request.Recipient,
                OrganisationId = request.OrganisationId,
                Destination = request.Destination,
                Subject = request.Subject,
                Message = request.Message,
                Platform = request.Platform,
                Status = NotificationStatus.Queued,
                TenantId = tenantContext.TenantId
            });

            return Result.OkIf(await context.SaveChangesAsync(cancellationToken) > 0, 
                CreateError.Create("Failed to create entry, contact support"));
        }));

    public async Task<Result> UpdateNotificationAsync(UpdateNotificationRequest request, CancellationToken cancellationToken = default) =>
        await Result.Try((Func<Task<Result>>)(async () =>
        {
            await using var context = await contextFactory.CreateDbContextAsync(cancellationToken);

            var changedTotal = await context.Notifications
                .Where(n => n.Id == request.NotificationId)
                .ExecuteUpdateAsync(f => f
                    .SetProperty(u => u.Destination, request.Destination)
                    .SetProperty(u => u.SentAt, request.SentAt)
                    .SetProperty(u => u.Error, request.Error)
                    .SetProperty(u => u.UpdatedAt, DateTime.UtcNow)
                    .SetProperty(u => u.Status, request.Status), cancellationToken);

            return Result.OkIf(changedTotal > 0, UpdateError.Create($"Failed to update notification: {request.NotificationId}, contact support"));
        }));

    public async Task<Result<Notification[]>> GetNotificationsAsync(string organisationIdHash, CancellationToken cancellationToken = default) =>
        await Result.Try((Func<Task<Result<Notification[]>>>)(async () =>
        {
            var decodeResult = hashService.DecodeLongIdHash(organisationIdHash);

            if (decodeResult.IsFailed)
                return Result.Fail(IdDecodeError.Create()
                    .CausedBy(decodeResult.Errors));

            await using var context = await contextFactory.CreateDbContextAsync(cancellationToken);

            var notifications = await context.Notifications.AsNoTracking()
                .Where(n => n.OrganisationId == decodeResult.Value)
                .OrderByDescending(o => o.Id)
                .ToListAsync(cancellationToken);

            return Result.Ok(notifications?.Select(i => i.Map()).ToArray() ?? []);
        }));

    public async Task<Result<Notification>> GetNotificationAsync(string notificationIdHash, CancellationToken cancellationToken = default) =>
        await Result.Try((Func<Task<Result<Notification>>>)(async () =>
        {
            var decodeResult = hashService.DecodeLongIdHash(notificationIdHash);

            if (decodeResult.IsFailed)
                return Result.Fail(IdDecodeError.Create()
                    .CausedBy(decodeResult.Errors));

            await using var context = await contextFactory.CreateDbContextAsync(cancellationToken);

            var notification = await context.Notifications.AsNoTracking()
                .FirstOrDefaultAsync(n => n.Id == decodeResult.Value, cancellationToken);

            return Result.FailIf(notification is null, NotFoundError.Create("Notification not found"))
                .ToResult(notification!.Map());
        }));
}