using System.Net.Http.Json;
using System.Text.Json;
using ItWorx.KnowledgeHub.Contracts.Auth;
using ItWorx.KnowledgeHub.Contracts.Setup;

namespace ItWorx.KnowledgeHub.IntegrationTests.Infrastructure;

public sealed record CsrfToken(string Value, string HeaderName);

/// <summary>Shared helpers so every test class does not re-implement the first-run
/// setup and CSRF handshake used to reach an authenticated state.</summary>
public static class SetupHelper
{
    private static readonly JsonSerializerOptions JsonOptions = new(JsonSerializerDefaults.Web);


    public static async Task<CsrfToken> GetCsrfTokenAsync(HttpClient client)
    {
        var response = await client.GetFromJsonAsync<CsrfTokenResponse>("/api/v1/auth/csrf", JsonOptions)
            ?? throw new InvalidOperationException("No CSRF token returned.");

        return new CsrfToken(response.Token, response.HeaderName);
    }

    public static async Task<HttpResponseMessage> CompleteFirstRunSetupAsync(
        HttpClient client,
        string workspaceName,
        string displayName,
        string email,
        string password)
    {
        var csrf = await GetCsrfTokenAsync(client);

        using var request = new HttpRequestMessage(HttpMethod.Post, "/api/v1/setup/complete")
        {
            Content = JsonContent.Create(
                new CompleteSetupRequest(workspaceName, displayName, email, password),
                options: JsonOptions)
        };
        request.Headers.Add(csrf.HeaderName, csrf.Value);

        return await client.SendAsync(request);
    }

    public static async Task<HttpResponseMessage> LoginAsync(HttpClient client, string email, string password)
    {
        return await client.PostAsJsonAsync(
            "/api/v1/auth/login",
            new LoginRequest(email, password),
            JsonOptions);
    }

    public static async Task<HttpResponseMessage> PostWithCsrfAsync<TBody>(
        HttpClient client,
        string path,
        TBody body)
    {
        var csrf = await GetCsrfTokenAsync(client);

        using var request = new HttpRequestMessage(HttpMethod.Post, path)
        {
            Content = JsonContent.Create(body, options: JsonOptions)
        };
        request.Headers.Add(csrf.HeaderName, csrf.Value);

        return await client.SendAsync(request);
    }

    public static async Task<HttpResponseMessage> PatchWithCsrfAsync<TBody>(
        HttpClient client,
        string path,
        TBody body)
    {
        var csrf = await GetCsrfTokenAsync(client);

        using var request = new HttpRequestMessage(HttpMethod.Patch, path)
        {
            Content = JsonContent.Create(body, options: JsonOptions)
        };
        request.Headers.Add(csrf.HeaderName, csrf.Value);

        return await client.SendAsync(request);
    }

    public static async Task<HttpResponseMessage> PutWithCsrfAsync<TBody>(
        HttpClient client,
        string path,
        TBody body,
        string? ifMatch = null)
    {
        var csrf = await GetCsrfTokenAsync(client);

        using var request = new HttpRequestMessage(HttpMethod.Put, path)
        {
            Content = JsonContent.Create(body, options: JsonOptions)
        };
        request.Headers.Add(csrf.HeaderName, csrf.Value);
        if (ifMatch is not null)
        {
            request.Headers.Add("If-Match", $"\"{ifMatch}\"");
        }

        return await client.SendAsync(request);
    }

    public static async Task<HttpResponseMessage> PostWithCsrfAndIfMatchAsync<TBody>(
        HttpClient client,
        string path,
        TBody body,
        string ifMatch)
    {
        var csrf = await GetCsrfTokenAsync(client);

        using var request = new HttpRequestMessage(HttpMethod.Post, path)
        {
            Content = JsonContent.Create(body, options: JsonOptions)
        };
        request.Headers.Add(csrf.HeaderName, csrf.Value);
        request.Headers.Add("If-Match", $"\"{ifMatch}\"");

        return await client.SendAsync(request);
    }

    public static async Task<HttpResponseMessage> DeleteWithCsrfAsync(HttpClient client, string path)
    {
        var csrf = await GetCsrfTokenAsync(client);

        using var request = new HttpRequestMessage(HttpMethod.Delete, path);
        request.Headers.Add(csrf.HeaderName, csrf.Value);

        return await client.SendAsync(request);
    }

    public static string? GetETag(HttpResponseMessage response) =>
        response.Headers.ETag?.Tag.Trim('"');

    public static async Task<HttpResponseMessage> PostMultipartWithCsrfAsync(
        HttpClient client,
        string path,
        byte[] fileBytes,
        string fileName,
        string contentType)
    {
        var csrf = await GetCsrfTokenAsync(client);

        using var content = new MultipartFormDataContent();
        var fileContent = new ByteArrayContent(fileBytes);
        fileContent.Headers.ContentType = new System.Net.Http.Headers.MediaTypeHeaderValue(contentType);
        content.Add(fileContent, "file", fileName);

        using var request = new HttpRequestMessage(HttpMethod.Post, path) { Content = content };
        request.Headers.Add(csrf.HeaderName, csrf.Value);

        return await client.SendAsync(request);
    }
}