using LiteCharms.Features.Extensions;
using LiteCharms.Features.Models;
using LiteCharms.Features.Shop.Notifications.Models;
using LiteCharms.Features.Shop.Postgres;

namespace LiteCharms.Features.Shop.Notifications;

public class NotificationService(IDbContextFactory<ShopDbContext> contextFactory)
{
    public async ValueTask<Result<Guid>> CreateNotificationAsync(CreateNotification request, CancellationToken cancellationToken = default)
    {
        try
        {
            using var context = await contextFactory.CreateDbContextAsync(cancellationToken);

            var newNotification = context.Notifications.Add(new Entities.Notification
            {
                Direction = request.Direction,
                SenderName = request.Sender,
                SenderAddress = request.SenderAddress,
                RecipientName = request.Recipient,
                RecipientAddress = request.RecipientAddress,
                Subject = request.Subject,
                Message = request.Message,
                Platform = request.Platform,
                Priority = request.Priority,
                CorrelationId = request.CorrelationId,
                CorrelationIdType = request.CorrelationIdType,
                IsInternal = request.IsInternal,
                IsHtml = request.IsHtml,
                Processed = false
            });

            return await context.SaveChangesAsync(cancellationToken) > 0
                ? Result.Ok(newNotification.Entity.Id)
                : Result.Fail(new Error("Failed to create notification"));
        }
        catch (Exception ex)
        {
            return Result.Fail(new Error(ex.Message).CausedBy(ex));
        }
    }

    public async ValueTask<Result<Notification>> GetNotificationAsync(Guid notificationId, CancellationToken cancellationToken = default)
    {
        try
        {
            await using var context = await contextFactory.CreateDbContextAsync(cancellationToken);

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

            return notification is not null
                ? Result.Ok(notification.ToModel())
                : Result.Fail<Notification>(new Error($"Notification with id {notificationId} not found"));
        }
        catch (Exception ex)
        {
            return Result.Fail<Notification>(new Error(ex.Message).CausedBy(ex));
        }
    }

    public async ValueTask<Result<Notification[]>> GetNotificationsAsync(DateRange range, CancellationToken cancellationToken = default)
    {
        try
        {
            var fromDate = range.From.ToDateTime(TimeOnly.MinValue, DateTimeKind.Utc);
            var toDate = range.To.ToDateTime(TimeOnly.MaxValue, DateTimeKind.Utc);

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

            var notifications = await context.Notifications.AsNoTracking()
                .Where(n => n.CreatedAt >= fromDate && n.CreatedAt <= toDate)
                .OrderByDescending(n => n.CreatedAt)
                .Take(range.MaxRecords)
                .ToArrayAsync(cancellationToken);

            return notifications?.Length > 0
                ? Result.Ok(notifications.Select(n => n.ToModel()).ToArray())
                : Result.Fail(new Error($"No notifications found for the specified date range {range.From} to {range.To}."));
        }
        catch (Exception ex)
        {
            return Result.Fail(new Error(ex.Message).CausedBy(ex));
        }
    }

    public async ValueTask<Result> UpdateNotificationAsync(UpdateNotification request, CancellationToken cancellationToken = default)
    {
        try
        {
            using var context = await contextFactory.CreateDbContextAsync(cancellationToken);

            var notification = await context.Notifications.FirstOrDefaultAsync(n => n.Id == request.NotificationId, cancellationToken);

            if (notification is null)
                return Result.Fail(new Error($"Notification with id {request.NotificationId} not found."));

            notification.Processed = request.Processed;
            notification.UpdatedAt = DateTime.UtcNow;

            if (request.HasError)
            {
                notification.HasError = request.HasError;
                notification.Errors = request.Errors;
            }

            return await context.SaveChangesAsync(cancellationToken) > 0
                ? Result.Ok()
                : Result.Fail(new Error($"Failed to update notification with id {request.NotificationId}."));
        }
        catch (Exception ex)
        {
            return Result.Fail(new Error(ex.Message).CausedBy(ex));
        }
    }
}