using System.Net;
using System.Text;
using System.Text.Json;
using SVSim.Database.Enums;
using SVSim.EmulatedEntrypoint.Extensions;
using SVSim.UnitTests.Infrastructure;

namespace SVSim.UnitTests.Controllers;

/// <summary>
/// Coverage for <c>/practice/*</c>. The solo-battle subsystem is mostly stubbed (no XP,
/// no missions, no rewards) but the endpoints must still round-trip successfully or the
/// solo-play UI breaks before reaching the battle screen.
/// </summary>
public class PracticeControllerTests
{
    private const string BaseRequestJson =
        """{"viewer_id":"0","steam_id":0,"steam_session_ticket":""}""";

    // ToApi() converts internal Format -> wire deck_format int (Format.All -> 0, etc.).
    private static string DeckFormatRequestJson(Format f) =>
        $$"""{"viewer_id":"0","steam_id":0,"steam_session_ticket":"","deck_format":{{f.ToApi()}}}""";

    [Test]
    public async Task Info_returns_non_empty_opponent_array()
    {
        using var factory = new SVSimTestFactory();
        long viewerId = await factory.SeedViewerAsync();
        using var client = factory.CreateAuthenticatedClient(viewerId);

        var response = await client.PostAsync("/practice/info",
            new StringContent(BaseRequestJson, Encoding.UTF8, "application/json"));

        var body = await response.Content.ReadAsStringAsync();
        Assert.That(response.StatusCode, Is.EqualTo(HttpStatusCode.OK), body);

        using var doc = JsonDocument.Parse(body);
        Assert.That(doc.RootElement.ValueKind, Is.EqualTo(JsonValueKind.Array),
            "/practice/info returns a bare array (no wrapper object) per spec.");
        Assert.That(doc.RootElement.GetArrayLength(), Is.GreaterThan(0));
        Assert.That(doc.RootElement[0].GetProperty("practice_id").GetInt32(), Is.GreaterThan(0));
    }

    [Test]
    public async Task DeckList_returns_viewer_decks()
    {
        using var factory = new SVSimTestFactory();
        long viewerId = await factory.SeedViewerAsync();
        await factory.SeedDeckAsync(viewerId, Format.Rotation, number: 1, name: "Rotation Deck");
        await factory.SeedDeckAsync(viewerId, Format.Unlimited, number: 1, name: "Unlimited Deck");

        using var client = factory.CreateAuthenticatedClient(viewerId);
        var response = await client.PostAsync("/practice/deck_list",
            new StringContent(DeckFormatRequestJson(Format.All), Encoding.UTF8, "application/json"));

        var body = await response.Content.ReadAsStringAsync();
        Assert.That(response.StatusCode, Is.EqualTo(HttpStatusCode.OK), body);

        using var doc = JsonDocument.Parse(body);
        var rotation = doc.RootElement.GetProperty("user_deck_rotation");
        var unlimited = doc.RootElement.GetProperty("user_deck_unlimited");
        Assert.That(rotation.GetArrayLength(), Is.EqualTo(1));
        Assert.That(rotation[0].GetProperty("deck_name").GetString(), Is.EqualTo("Rotation Deck"));
        Assert.That(unlimited.GetArrayLength(), Is.EqualTo(1));
        Assert.That(unlimited[0].GetProperty("deck_name").GetString(), Is.EqualTo("Unlimited Deck"));
    }

    [Test]
    public async Task DeckList_empty_when_viewer_has_none()
    {
        using var factory = new SVSimTestFactory();
        long viewerId = await factory.SeedViewerAsync();
        using var client = factory.CreateAuthenticatedClient(viewerId);

        var response = await client.PostAsync("/practice/deck_list",
            new StringContent(DeckFormatRequestJson(Format.All), Encoding.UTF8, "application/json"));

        var body = await response.Content.ReadAsStringAsync();
        Assert.That(response.StatusCode, Is.EqualTo(HttpStatusCode.OK), body);

        using var doc = JsonDocument.Parse(body);
        Assert.That(doc.RootElement.GetProperty("user_deck_rotation").GetArrayLength(), Is.EqualTo(0));
        Assert.That(doc.RootElement.GetProperty("user_deck_unlimited").GetArrayLength(), Is.EqualTo(0));
    }

    [Test]
    public async Task Start_returns_200()
    {
        using var factory = new SVSimTestFactory();
        long viewerId = await factory.SeedViewerAsync();
        using var client = factory.CreateAuthenticatedClient(viewerId);

        var response = await client.PostAsync("/practice/start",
            new StringContent(BaseRequestJson, Encoding.UTF8, "application/json"));

        Assert.That(response.StatusCode, Is.EqualTo(HttpStatusCode.OK));
    }

    [Test]
    public async Task Finish_accepts_any_recovery_data_returns_zero_xp()
    {
        using var factory = new SVSimTestFactory();
        long viewerId = await factory.SeedViewerAsync();
        using var client = factory.CreateAuthenticatedClient(viewerId);

        // recoveryData is an opaque JSON blob serialized to string by the client; the server
        // is supposed to accept it without validation. Anything goes.
        // deck_format:1 = Format.Rotation on the wire. The controller ignores the field today
        // (practice is per-format upstream), but sending a coherent wire code keeps the test
        // intent clean if Finish ever starts validating it.
        var finishJson =
            """{"viewer_id":"0","steam_id":0,"steam_session_ticket":"","deck_no":1,"is_win":1,"evolve_count":2,"total_turn":5,"enemy_class_id":3,"difficulty":1,"deck_format":1,"class_id":1,"recovery_data":"{\"opaque\":\"blob\"}"}""";

        var response = await client.PostAsync("/practice/finish",
            new StringContent(finishJson, Encoding.UTF8, "application/json"));

        var body = await response.Content.ReadAsStringAsync();
        Assert.That(response.StatusCode, Is.EqualTo(HttpStatusCode.OK), body);

        using var doc = JsonDocument.Parse(body);
        Assert.That(doc.RootElement.GetProperty("get_class_experience").GetInt32(), Is.EqualTo(0));
        Assert.That(doc.RootElement.GetProperty("class_experience").GetInt32(), Is.EqualTo(0));
        Assert.That(doc.RootElement.GetProperty("reward_list").GetArrayLength(), Is.EqualTo(0));
    }
}