using System;
using System.IO;
using System.Linq;
using System.Net.Http;
using System.Security.Cryptography;
using System.Text;
using System.Text.Json;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace Reader
{
    public partial class MainForm : Form
    {
        private static readonly HttpClient http = new HttpClient();
        private const string ServerUrl = "http://localhost:5000";

        public MainForm()
        {
            InitializeComponent();
        }

        private void btnBrowse_Click(object sender, EventArgs e)
        {
            using var fbd = new FolderBrowserDialog();
            if (fbd.ShowDialog() == DialogResult.OK)
            {
                txtFolder.Text = fbd.SelectedPath;
            }
        }

        private async void btnRead_Click(object sender, EventArgs e)
        {
            var folder = txtFolder.Text;
            if (string.IsNullOrWhiteSpace(folder) || !Directory.Exists(folder))
            {
                MessageBox.Show("请选择有效的文件夹。", "错误", MessageBoxButtons.OK, MessageBoxIcon.Warning);
                return;
            }
            dgv.Rows.Clear();
            var files = Directory.GetFiles(folder, "*", SearchOption.AllDirectories);
            var shaList = new System.Collections.Generic.List<string>();
            var fileMap = new System.Collections.Generic.Dictionary<string, string>();
            foreach (var f in files)
            {
                try
                {
                    var sha = await Task.Run(() => ComputeSha256(f));
                    shaList.Add(sha);
                    fileMap[sha] = f;
                }
                catch { }
            }
            if (shaList.Count == 0)
            {
                MessageBox.Show("没有找到文件。", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
                return;
            }
            var payload = new { shas = shaList };
            var content = new StringContent(JsonSerializer.Serialize(payload), Encoding.UTF8, "application/json");
            var resp = await http.PostAsync(ServerUrl + "/read", content);
            if (!resp.IsSuccessStatusCode)
            {
                MessageBox.Show("读取失败: " + await resp.Content.ReadAsStringAsync(), "失败", MessageBoxButtons.OK, MessageBoxIcon.Error);
                return;
            }
            var text = await resp.Content.ReadAsStringAsync();
            using var doc = JsonDocument.Parse(text);
            var root = doc.RootElement;
            var data = root.GetProperty("data");
            foreach (var sha in shaList)
            {
                var fileName = Path.GetFileName(fileMap[sha]);
                if (data.TryGetProperty(sha, out var item) && item.ValueKind != JsonValueKind.Null)
                {
                    var up = item.GetProperty("upload_code").GetString() ?? "";
                    var down = item.GetProperty("download_code").GetString() ?? "";
                    var created = item.GetProperty("created_at").GetString() ?? "";
                    dgv.Rows.Add(fileName, up, down, created);
                }
                else
                {
                    dgv.Rows.Add(fileName, "无", "无", "无");
                }
            }
        }

        private static string ComputeSha256(string filePath)
        {
            using var sha = SHA256.Create();
            using var stream = File.OpenRead(filePath);
            var hash = sha.ComputeHash(stream);
            var sb = new StringBuilder();
            foreach (var b in hash) sb.Append(b.ToString("x2"));
            return sb.ToString();
        }
    }
}