using System.Net;
using System.Text;
using System.Text.Json;
using NUnit.Framework;
using SVSim.UnitTests.Infrastructure;

namespace SVSim.UnitTests.Controllers;

public class GiftControllerTests
{
    private const string BaseAuthBlock =
        @"""viewer_id"":""0"",""steam_id"":0,""steam_session_ticket"":""""";

    [Test]
    public async Task GiftTop_returns_five_tutorial_gifts_for_unclaimed_viewer()
    {
        using var factory = new SVSimTestFactory();
        long viewerId = await factory.SeedViewerAsync(tutorialState: 31);
        using var client = factory.CreateAuthenticatedClient(viewerId);

        var response = await client.PostAsync("/tutorial/gift_top",
            new StringContent($$"""{"page":1,{{BaseAuthBlock}}}""", Encoding.UTF8, "application/json"));

        Assert.That(response.StatusCode, Is.EqualTo(HttpStatusCode.OK));
        using var doc = JsonDocument.Parse(await response.Content.ReadAsStringAsync());
        var root = doc.RootElement;

        var presents = root.GetProperty("present_list");
        Assert.That(presents.GetArrayLength(), Is.EqualTo(5));

        // Expect the legendary pack entry (present_id 71478630) to be present.
        bool foundLegendaryGift = false;
        foreach (var p in presents.EnumerateArray())
        {
            if (p.GetProperty("present_id").GetString() == "71478630")
            {
                foundLegendaryGift = true;
                Assert.That(p.GetProperty("reward_type").GetString(), Is.EqualTo("4"));
                Assert.That(p.GetProperty("reward_detail_id").GetString(), Is.EqualTo("90001"));
                Assert.That(p.GetProperty("reward_count").GetString(), Is.EqualTo("1"));
                Assert.That(p.GetProperty("item_type").GetInt32(), Is.EqualTo(2));
                Assert.That(p.GetProperty("message").GetString(), Is.EqualTo("For completing the tutorial"));
            }
        }
        Assert.That(foundLegendaryGift, Is.True, "Legendary starter pack gift (71478630) must be in present_list.");

        Assert.That(root.GetProperty("present_history_list").GetArrayLength(), Is.EqualTo(0));
        Assert.That(root.GetProperty("limit_over_present_list").GetArrayLength(), Is.EqualTo(0));
    }

    [Test]
    public async Task GiftReceive_grants_currency_and_items_then_history_is_populated()
    {
        using var factory = new SVSimTestFactory();
        await factory.SeedGlobalsAsync();
        long viewerId = await factory.SeedViewerAsync(tutorialState: 31);
        using var client = factory.CreateAuthenticatedClient(viewerId);

        var pre = await factory.GetViewerCurrencyAsync(viewerId);

        var requestJson = $$"""
        {"present_id_array":["71478626","71478627","71478628","71478629","71478630"],"state":1,{{BaseAuthBlock}}}
        """;
        var response = await client.PostAsync("/tutorial/gift_receive",
            new StringContent(requestJson, Encoding.UTF8, "application/json"));

        Assert.That(response.StatusCode, Is.EqualTo(HttpStatusCode.OK));
        using var doc = JsonDocument.Parse(await response.Content.ReadAsStringAsync());
        var root = doc.RootElement;

        // Five received ids echoed.
        var ids = root.GetProperty("received_ids").EnumerateArray()
            .Select(e => e.GetString()).ToHashSet();
        Assert.That(ids, Is.EquivalentTo(new[] { "71478626", "71478627", "71478628", "71478629", "71478630" }));

        // present_list emptied, history populated.
        Assert.That(root.GetProperty("present_list").GetArrayLength(), Is.EqualTo(0));
        Assert.That(root.GetProperty("present_history_list").GetArrayLength(), Is.EqualTo(5));

        // Currency credited: +400 crystals, +100 rupees.
        var post = await factory.GetViewerCurrencyAsync(viewerId);
        Assert.That(post.Crystals - pre.Crystals, Is.EqualTo(400UL));
        Assert.That(post.Rupees - pre.Rupees, Is.EqualTo(100UL));
    }

    [Test]
    public async Task GiftReceive_advances_tutorial_state_from_31_to_41()
    {
        using var factory = new SVSimTestFactory();
        await factory.SeedGlobalsAsync();
        long viewerId = await factory.SeedViewerAsync(tutorialState: 31);
        using var client = factory.CreateAuthenticatedClient(viewerId);

        var json = $$"""{"present_id_array":["71478626"],"state":1,{{BaseAuthBlock}}}""";
        var response = await client.PostAsync("/tutorial/gift_receive",
            new StringContent(json, Encoding.UTF8, "application/json"));

        Assert.That(response.StatusCode, Is.EqualTo(HttpStatusCode.OK));
        using var doc = JsonDocument.Parse(await response.Content.ReadAsStringAsync());
        var root = doc.RootElement;

        // Response carries the new step inline.
        Assert.That(root.GetProperty("tutorial_step").GetInt32(), Is.EqualTo(41));
        Assert.That(root.GetProperty("is_unreceived_present").GetBoolean(), Is.False);
        Assert.That(root.GetProperty("reward_list").GetArrayLength(), Is.EqualTo(1));

        // Side effect: viewer state advanced to 41.
        Assert.That(await factory.GetViewerTutorialStateAsync(viewerId), Is.EqualTo(41));
    }

    [Test]
    public async Task GiftReceive_second_call_with_same_ids_does_not_double_grant()
    {
        using var factory = new SVSimTestFactory();
        await factory.SeedGlobalsAsync();
        long viewerId = await factory.SeedViewerAsync(tutorialState: 31);
        using var client = factory.CreateAuthenticatedClient(viewerId);

        var preFirst = await factory.GetViewerCurrencyAsync(viewerId);
        var json = $$"""{"present_id_array":["71478626","71478627"],"state":1,{{BaseAuthBlock}}}""";

        await client.PostAsync("/tutorial/gift_receive", new StringContent(json, Encoding.UTF8, "application/json"));
        var midPost = await factory.GetViewerCurrencyAsync(viewerId);
        Assert.That(midPost.Crystals - preFirst.Crystals, Is.EqualTo(400UL));
        Assert.That(midPost.Rupees - preFirst.Rupees, Is.EqualTo(100UL));

        var second = await client.PostAsync("/tutorial/gift_receive", new StringContent(json, Encoding.UTF8, "application/json"));
        Assert.That(second.StatusCode, Is.EqualTo(HttpStatusCode.OK));
        var finalPost = await factory.GetViewerCurrencyAsync(viewerId);
        Assert.That(finalPost.Crystals, Is.EqualTo(midPost.Crystals), "Second claim of same present_ids must not re-grant.");
        Assert.That(finalPost.Rupees, Is.EqualTo(midPost.Rupees));
    }
}