using System.Net.Http.Json;
using System.Text.Json;

namespace Distribution.Features.GeneralLedger;

public record GeneralLedgerResult(int StatusCode, bool Success, JsonElement? Body);

public interface IGeneralLedgerClient
{
    Task<bool> IsHealthyAsync(CancellationToken ct = default);
    Task<GeneralLedgerResult> SendAsync(HttpMethod method, string path, object? payload = null, CancellationToken ct = default);
}

/// <summary>
/// Service-to-service client for the General Ledger microservice. The GL service is not user-facing:
/// every request carries the shared X-Api-Key (GeneralLedger:ApiKey, must equal the GL service's ApiKey:Value).
/// <paramref name="path"/> is relative to GeneralLedger:BaseUrl and carries the API version (e.g. "v1/accounts", "v1/journal-entries"), so moving a call to v2 is a one-path change.
/// </summary>
public class GeneralLedgerClient(HttpClient http) : IGeneralLedgerClient
{
    public async Task<bool> IsHealthyAsync(CancellationToken ct = default)
    {
        try
        {
            using var response = await http.GetAsync("/health", ct);
            return response.IsSuccessStatusCode;
        }
        catch (HttpRequestException)
        {
            return false;
        }
    }

    public async Task<GeneralLedgerResult> SendAsync(HttpMethod method, string path, object? payload = null, CancellationToken ct = default)
    {
        using var request = new HttpRequestMessage(method, path.TrimStart('/'));
        if (payload is not null) request.Content = JsonContent.Create(payload);

        using var response = await http.SendAsync(request, ct);
        JsonElement? body = null;
        if (response.Content.Headers.ContentLength != 0)
        {
            try { body = await response.Content.ReadFromJsonAsync<JsonElement>(cancellationToken: ct); }
            catch (JsonException) { }
        }
        return new GeneralLedgerResult((int)response.StatusCode, response.IsSuccessStatusCode, body);
    }
}