using System.Net.Http.Headers;
using System.Net.Http.Json;
using System.Text;
using System.Text.Json;
using NozCli.Core.Config;
using NozCli.Core.Models;

namespace NozCli.Core.Client;

public class NozApiClient : IDisposable
{
    private readonly HttpClient _http;

    public NozApiClient(LocalConfig cfg)
    {
        _http = new HttpClient
        {
            BaseAddress = new Uri(cfg.ServerUrl.TrimEnd('/') + "/"),
            // Enforce TLS — reject plain HTTP at the OS level
            DefaultRequestVersion = new Version(2, 0),
        };
        _http.DefaultRequestHeaders.Authorization =
            new AuthenticationHeaderValue("Bearer", cfg.Token);
    }

    public async Task<ServerCapabilities> GetConfigAsync()
    {
        var res = await _http.GetFromJsonAsync<JsonElement>("api/cli/config");
        return new ServerCapabilities(
            Server:       res.GetProperty("server").GetString()!,
            Enabled:      res.GetProperty("enabled").GetBoolean(),
            AllowPush:    res.GetProperty("allow_push").GetBoolean(),
            AllowDelete:  res.GetProperty("allow_delete").GetBoolean(),
            AllowVault:   res.GetProperty("allow_vault").GetBoolean(),
            AllowRebuild: res.GetProperty("allow_rebuild").GetBoolean()
        );
    }

    public async Task<List<NoteInfo>> GetNotesAsync()
    {
        var res   = await _http.GetFromJsonAsync<JsonElement>("api/cli/notes");
        var notes = res.GetProperty("notes");
        return notes.EnumerateArray().Select(n => new NoteInfo(
            Slug:    n.GetProperty("slug").GetString()!,
            Title:   n.GetProperty("title").GetString()!,
            Status:  n.GetProperty("status").GetString()!,
            Topic:   n.GetProperty("topic").GetString()!,
            Lang:    n.GetProperty("lang").GetString()!,
            Private: n.GetProperty("private").GetBoolean(),
            Hash:    n.TryGetProperty("hash", out var h) ? h.GetString() : null
        )).ToList();
    }

    public async Task<NoteContent> GetNoteAsync(string slug)
    {
        var res = await _http.GetFromJsonAsync<JsonElement>($"api/cli/notes/{slug}");
        return new NoteContent(
            Slug:     res.GetProperty("slug").GetString()!,
            Markdown: res.GetProperty("markdown").GetString()!,
            Hash:     res.GetProperty("hash").GetString()!
        );
    }

    public async Task<string> PutNoteAsync(string slug, string markdown)
    {
        var body    = JsonSerializer.Serialize(new { markdown });
        var content = new StringContent(body, Encoding.UTF8, "application/json");
        var res     = await _http.PutAsync($"api/cli/notes/{slug}", content);
        res.EnsureSuccessStatusCode();
        var json = await res.Content.ReadFromJsonAsync<JsonElement>();
        return json.GetProperty("hash").GetString()!;
    }

    public async Task DeleteNoteAsync(string slug)
    {
        var res = await _http.DeleteAsync($"api/cli/notes/{slug}");
        res.EnsureSuccessStatusCode();
    }

    public async Task RebuildIndexAsync()
    {
        var res = await _http.PostAsync("api/cli/rebuild", null);
        res.EnsureSuccessStatusCode();
    }

    public void Dispose() => _http.Dispose();
}