using Microsoft.AspNetCore.Components.Forms;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net.Http.Json;
using System.Text;
using System.Threading.Tasks;
using TIAMWebApp.Shared.Application.Models;

namespace TIAMWebApp.Shared.Application.Services
{

    public class BlogService
    {
        private readonly HttpClient _http;

        public BlogService(HttpClient http)
        {
            _http = http;
        }

        public async Task<List<BlogPostMetadata>> GetAllPostsAsync()
        {
            return await _http.GetFromJsonAsync<List<BlogPostMetadata>>("/api/blog") ?? new();
        }

        public async Task<BlogPostMetadata?> GetPostByIdAsync(string id)
        {
            return await _http.GetFromJsonAsync<BlogPostMetadata>($"/api/blog/{id}");
        }

        public async Task<BlogPostMetadata?> CreatePostAsync(BlogPostMetadata metadata, IBrowserFile? coverImage)
        {
            using var content = new MultipartFormDataContent();
            content.Add(new StringContent(metadata.Title ?? ""), "Title");
            content.Add(new StringContent(metadata.Lead ?? ""), "Lead");
            content.Add(new StringContent(metadata.DriveLink ?? ""), "DriveLink");
            content.Add(new StringContent(string.Join(",", metadata.Tags ?? new())), "Tags");

            if (coverImage != null)
            {
                var fileContent = new StreamContent(coverImage.OpenReadStream(long.MaxValue));
                fileContent.Headers.ContentType = new System.Net.Http.Headers.MediaTypeHeaderValue(coverImage.ContentType);
                content.Add(fileContent, "CoverImage", coverImage.Name);
            }

            var response = await _http.PostAsync("/api/blog", content);
            response.EnsureSuccessStatusCode();
            return await response.Content.ReadFromJsonAsync<BlogPostMetadata>();
        }

        public async Task UpdatePostAsync(BlogPostMetadata metadata, IBrowserFile? newImageFile = null)
        {
            using var content = new MultipartFormDataContent();

            content.Add(new StringContent(metadata.Title ?? ""), "Title");
            content.Add(new StringContent(metadata.Lead ?? ""), "Lead");
            content.Add(new StringContent(metadata.DriveLink ?? ""), "DriveLink");
            content.Add(new StringContent(string.Join(",", metadata.Tags ?? new List<string>())), "Tags");

            if (newImageFile != null)
            {
                var stream = newImageFile.OpenReadStream(maxAllowedSize: 10 * 1024 * 1024); // 10 MB max
                var fileContent = new StreamContent(stream);
                fileContent.Headers.ContentType = new System.Net.Http.Headers.MediaTypeHeaderValue(newImageFile.ContentType);
                content.Add(fileContent, "CoverImage", newImageFile.Name);
            }

            var response = await _http.PutAsync($"/api/blog/{metadata.Id}", content);
            response.EnsureSuccessStatusCode();
        }


        public async Task DeletePostAsync(string id)
        {
            var response = await _http.DeleteAsync($"/api/blog/{id}");
            response.EnsureSuccessStatusCode();
        }
    }

}