using System.Text.Json;
using Blog.Models;
using Microsoft.Extensions.Caching.Hybrid;

namespace Blog.Services;

public class BrpService(HybridCache cache, HttpClient client)
{
    public async Task<BRPEntry[]> GetBrpEntriesAsync(CancellationToken cancellationToken = default)
    {
        return await cache.GetOrCreateAsync(
            "brp",
            async cancel =>
            {
                await using FileStream filestream = File.Open("Resources/test-data.json", FileMode.Open);
                var entries = await JsonSerializer.DeserializeAsync<BRPEntry[]>(filestream, cancellationToken: cancel)
                    .ConfigureAwait(false);
                return entries ?? [];
            },
            cancellationToken: cancellationToken)
            .ConfigureAwait(false);
    }

    public async Task<(JsonDocument request, JsonDocument response)> GetBrpEntryAsync(string bsn, CancellationToken cancellationToken = default)
    {
        return await cache.GetOrCreateAsync(
                $"brp/{bsn}",
                bsn,
                async (state, cancel) => await FetchBrpEntryAsync(state, cancel),
                cancellationToken: cancellationToken)
            .ConfigureAwait(false);
    }

    private async Task<(JsonDocument request, JsonDocument response)> FetchBrpEntryAsync(string bsn, CancellationToken cancellationToken)
    {
        var response = await client.PostAsJsonAsync(
                "haalcentraal/api/brp/personen", 
                new RaadpleegMetBurgerservicenummer(bsn),
                cancellationToken)
            .ConfigureAwait(false);

        await using var stream = await response.Content.ReadAsStreamAsync(cancellationToken).ConfigureAwait(false);
        var responseDocument = await JsonDocument.ParseAsync(stream, cancellationToken: cancellationToken).ConfigureAwait(false);
        
        await using var requestStream = await response.RequestMessage!.Content!.ReadAsStreamAsync(cancellationToken).ConfigureAwait(false);
        var requestDocument = await JsonDocument.ParseAsync(requestStream, cancellationToken: cancellationToken).ConfigureAwait(false);

        return (requestDocument, responseDocument);
    }
}