using Microsoft.EntityFrameworkCore;
using T120B165_ImgBoard.Data;
using T120B165_ImgBoard.Models;
using T120B165_ImgBoard.Utils;

namespace T120B165_ImgBoard.Services;

public interface ICommentService
{
    Task<Comment> Create(string text, User author, Post post);
    Task<Comment?> GetById(int commentId);
    Task<PagedList<Comment>> GetAll(int pageNumber = 1);
    Task<bool> Delete(Comment comment);
    Task<Comment> Update(Comment comment);
}

public class CommentService(ImgBoardContext context): ICommentService
{
    private const int PageSize = 20;
    
    public async Task<Comment> Create(string text, User author, Post post)
    {
        var entry = new Comment
        {
            Text = text,
            Author = author,
            OriginalPost = post,
            Created = DateTime.Now,
        };
        await context.Comments.AddAsync(entry);
        await context.SaveChangesAsync();
        return entry;
    }

    public async Task<Comment?> GetById(int commentId)
    {
        return await context.Comments.Where(t => t.Id == commentId)
            .Include(b => b.Author)
            .Include(b => b.OriginalPost)
            .FirstOrDefaultAsync();
    }

    public async Task<PagedList<Comment>> GetAll(int pageNumber = 1)
    {
        var totalCount = await context.Comments.CountAsync();
        var items = await context.Comments
            .Skip((pageNumber - 1) * PageSize)
            .Take(PageSize)
            .Include(b => b.Author)
            .Include(b => b.OriginalPost)
            .ToListAsync();
        return new PagedList<Comment>(items, pageNumber, PageSize, totalCount);
    }

    public async Task<bool> Delete(Comment comment)
    {
        context.Comments.Remove(comment);
        await context.SaveChangesAsync();
        return true;
    }

    public async Task<Comment> Update(Comment comment)
    {
        context.Comments.Update(comment);
        await context.SaveChangesAsync();
        return comment;
    }
}