using AutoMapper;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Http.HttpResults;
using Microsoft.AspNetCore.Mvc;
using Microsoft.EntityFrameworkCore;
using OnlyPrompt.Backend.ApiModels.Prompt;
using OnlyPrompt.Backend.Database;
using OnlyPrompt.Backend.Utils;
using System.ComponentModel.DataAnnotations;

namespace OnlyPrompt.Backend.Controllers
{
	[ApiController]
	[Route("api/v1/feed")]
	[Authorize(Roles = ModelConstants.UserRole)]
	public class FeedController : BaseController
	{
		public FeedController(OnlyPromptContext db, IMapper mapper) : base(db, mapper)
		{
		}

		[HttpGet]
		public async Task<ApiMinimalPrompt[]> GetFeedAsync(
			[Range(0, double.MaxValue)][FromQuery]int offset = 0, 
			[Range(1, 100)][FromQuery]int limit = 20,
			[FromQuery]FeedSortType sortBy = FeedSortType.Date,
			[FromQuery]bool ascending = false,
			[FromQuery]Identifier? category = null,
			[FromQuery]DateTime? fromDate = null,
			[FromQuery]DateTime? toDate = null
		)
		{
			var userId = User.GetUserId();
			var query = _db.Prompts
				.Where(
					x => x.Creator.Subscribers.Any(s => s.SubscriberId == userId)
					&& x.CreatorId != userId
				);

			if (category.HasValue)
				query = query.Where(x => category.Value.Id.HasValue ? x.CategoryId == category.Value.Id.Value : x.Category.Slug == category.Value.Slug);

			if (fromDate.HasValue)
				query = query.Where(x => x.UpdatedAt >= fromDate.Value);
		
			if (toDate.HasValue)
				query = query.Where(x => x.UpdatedAt <= toDate.Value);

			query = sortBy switch { 
				FeedSortType.Date => query.OrderBy(x => x.UpdatedAt, ascending),
				FeedSortType.Rating => query.OrderBy(x => x.Reviews.Average(r => (double?)r.Rating) ?? 2.5, ascending),
				_ => query
			};

			var prompts = await query
				.Skip(offset)
				.Take(limit)
				.Select(x => new ApiMinimalPrompt(
					x.Id,
					x.Title,
					x.UpdatedAt,
					x.CreatorId,
					x.Creator.Profile.DisplayName,
					x.SubscriptionTier.Level,
					x.SubscriptionTier.Name,
					x.Reviews.Average(r => (double?)r.Rating),
					x.SubscriptionTier == null || x.Creator.Subscribers.Any(s => s.SubscriberId == userId && x.SubscriptionTier.Level < s.SubscriptionTier.Level)
				)).ToArrayAsync();

			return prompts;
		}
	}
}