using System.Net.Http.Json;
using System.Text.Json;
using Microsoft.Extensions.DependencyInjection;
using NUnit.Framework;
using SVSim.BattleNode.Bridge;
using SVSim.BattleNode.Sessions;
using SVSim.Database.Enums;
using SVSim.EmulatedEntrypoint.Services;
using SVSim.UnitTests.Infrastructure;

namespace SVSim.UnitTests.Controllers;

[TestFixture]
public class RankBattleControllerTests
{
    // BaseRequest fields (viewer_id / steam_id / steam_session_ticket) are required by the
    // request DTOs — the ApiController's auto-validation rejects bodies missing them. We
    // post placeholder values here; the TestAuthHandler injects the real viewer-id via the
    // X-Test-Viewer-Id header set by CreateAuthenticatedClient, so these body values are
    // ignored by auth.
    private static readonly object DoMatchingBody = new
    {
        deck_no = 1,
        need_init = 1,
        log = 0,
        viewer_id = "0",
        steam_id = 0,
        steam_session_ticket = "",
    };

    private static object FinishBody(int battleResult, int classId = 3) => new
    {
        battle_result = battleResult,
        is_retire = 0,
        recovery_data = "{}",
        class_id = classId,
        total_turn = 5,
        viewer_id = "0",
        steam_id = 0,
        steam_session_ticket = "",
    };

    private static readonly object EmptyAuthedBody = new
    {
        viewer_id = "0",
        steam_id = 0,
        steam_session_ticket = "",
    };

    /// <summary>
    /// AiStart in the real client flow always follows a do_matching call that resolved
    /// to 3011 (AI fallback) — that's when the PendingBattle is registered with the
    /// viewer's queue-time MatchContext (deck/cosmetics). Tests bypass do_matching's
    /// time-threshold to register a Bot PendingBattle directly via the bridge.
    /// </summary>
    private static async Task RegisterBotBattleAsync(SVSimTestFactory factory, long viewerId, Format format, int deckNo)
    {
        var bridge = factory.Services.GetRequiredService<IMatchingBridge>();
        using var scope = factory.Services.CreateScope();
        var builder = scope.ServiceProvider.GetRequiredService<IMatchContextBuilder>();
        var ctx = await builder.BuildForRankBattleAsync(viewerId, format, deckNo);
        bridge.RegisterBattle(new BattlePlayer(viewerId, ctx), p2: null, BattleType.Bot);
    }

    [Test]
    public async Task DoMatching_rotation_first_poll_returns_3002_RETRY_with_empty_node_server_url()
    {
        await using var factory = new SVSimTestFactory();
        var viewerId = await factory.SeedViewerAsync();
        await factory.SeedGlobalsAsync();
        await factory.SeedDeckAsync(viewerId, Format.Rotation, 1);
        var client = factory.CreateAuthenticatedClient(viewerId);

        var resp = await client.PostAsJsonAsync("/rotation_rank_battle/do_matching", DoMatchingBody);

        Assert.That(resp.IsSuccessStatusCode, Is.True, $"Expected 2xx, got {resp.StatusCode}");
        var raw = await resp.Content.ReadAsStringAsync();
        using var doc = JsonDocument.Parse(raw);
        var data = doc.RootElement;
        Assert.That(data.GetProperty("matching_state").GetInt32(), Is.EqualTo(3002));
        Assert.That(data.GetProperty("node_server_url").GetString(), Is.EqualTo(""),
            "Empty string, not absent — Phase 2 fix pattern.");
    }

    [Test]
    public async Task DoMatching_rotation_two_viewers_pair_PvP()
    {
        await using var factory = new SVSimTestFactory();
        var v1 = await factory.SeedViewerAsync(steamId: 76_561_198_000_000_001UL, displayName: "Alice");
        var v2 = await factory.SeedViewerAsync(steamId: 76_561_198_000_000_002UL, displayName: "Bob");
        await factory.SeedGlobalsAsync();
        await factory.SeedDeckAsync(v1, Format.Rotation, 1);
        await factory.SeedDeckAsync(v2, Format.Rotation, 1);

        // Alice polls first → parks.
        var c1 = factory.CreateAuthenticatedClient(v1);
        var r1 = await c1.PostAsJsonAsync("/rotation_rank_battle/do_matching", DoMatchingBody);
        var j1 = JsonDocument.Parse(await r1.Content.ReadAsStringAsync()).RootElement;
        Assert.That(j1.GetProperty("matching_state").GetInt32(), Is.EqualTo(3002));

        // Bob polls — pairs, returns joiner (3004).
        var c2 = factory.CreateAuthenticatedClient(v2);
        var r2 = await c2.PostAsJsonAsync("/rotation_rank_battle/do_matching", DoMatchingBody);
        var j2 = JsonDocument.Parse(await r2.Content.ReadAsStringAsync()).RootElement;
        Assert.That(j2.GetProperty("matching_state").GetInt32(), Is.EqualTo(3004), "Joiner = 3004.");
        Assert.That(j2.GetProperty("battle_id").GetString(), Is.Not.Null.And.Not.Empty);
        Assert.That(j2.GetProperty("node_server_url").GetString(), Is.Not.Empty);

        // Alice polls again — gets cached match, owner role (3007).
        var r3 = await c1.PostAsJsonAsync("/rotation_rank_battle/do_matching", DoMatchingBody);
        var j3 = JsonDocument.Parse(await r3.Content.ReadAsStringAsync()).RootElement;
        Assert.That(j3.GetProperty("matching_state").GetInt32(), Is.EqualTo(3007), "Owner = 3007.");
        Assert.That(j3.GetProperty("battle_id").GetString(), Is.EqualTo(j2.GetProperty("battle_id").GetString()));
    }

    [Test]
    public async Task AiStart_rotation_returns_ai_id_plus_self_oppo_info_camelCase_keys()
    {
        await using var factory = new SVSimTestFactory();
        var viewerId = await factory.SeedViewerAsync(displayName: "TestViewer");
        await factory.SeedGlobalsAsync();
        await factory.SeedDeckAsync(viewerId, Format.Rotation, 1);
        await RegisterBotBattleAsync(factory, viewerId, Format.Rotation, deckNo: 1);
        var client = factory.CreateAuthenticatedClient(viewerId);

        var resp = await client.PostAsJsonAsync("/ai_rotation_rank_battle/start", EmptyAuthedBody);
        var raw = await resp.Content.ReadAsStringAsync();

        using var doc = JsonDocument.Parse(raw);
        var data = doc.RootElement;
        // Series-1 ids from rm_ai_setting.csv — must be one of the real catalog entries.
        Assert.That(data.GetProperty("ai_id").GetInt32(),
            Is.AnyOf(1111, 1121, 1131, 1141, 1151, 1161, 1171, 1181));
        Assert.That(data.GetProperty("turnState").GetInt32(), Is.EqualTo(0));

        // Literal camelCase wire-key checks — these MUST be present verbatim
        // (client uses JsonData.Keys.Contains).
        Assert.That(raw, Does.Contain("\"userName\""), "Wire key must be camelCase, not snake_case.");
        Assert.That(raw, Does.Contain("\"sleeveId\""));
        Assert.That(raw, Does.Contain("\"emblemId\""));
        Assert.That(raw, Does.Contain("\"degreeId\""));
        Assert.That(raw, Does.Contain("\"fieldId\""));
        Assert.That(raw, Does.Contain("\"isOfficial\""));
        Assert.That(raw, Does.Contain("\"classId\""));
        Assert.That(raw, Does.Contain("\"charaId\""));
        Assert.That(raw, Does.Contain("\"isMasterRank\""));
        Assert.That(raw, Does.Contain("\"battlePoint\""));
        Assert.That(raw, Does.Contain("\"masterPoint\""));
        // self_info / oppo_info / country_code stay snake_case (the outliers per ai-start.md).
        Assert.That(raw, Does.Contain("\"self_info\""));
        Assert.That(raw, Does.Contain("\"oppo_info\""));
        Assert.That(raw, Does.Contain("\"country_code\""));
    }

    [Test]
    public async Task AiStart_self_info_reflects_caller_user_name()
    {
        await using var factory = new SVSimTestFactory();
        var viewerId = await factory.SeedViewerAsync(displayName: "Alice");
        await factory.SeedGlobalsAsync();
        await factory.SeedDeckAsync(viewerId, Format.Rotation, 1);
        await RegisterBotBattleAsync(factory, viewerId, Format.Rotation, deckNo: 1);
        var client = factory.CreateAuthenticatedClient(viewerId);

        var resp = await client.PostAsJsonAsync("/ai_rotation_rank_battle/start", EmptyAuthedBody);
        using var doc = JsonDocument.Parse(await resp.Content.ReadAsStringAsync());
        var selfInfo = doc.RootElement.GetProperty("self_info");

        Assert.That(selfInfo.GetProperty("userName").GetString(), Is.EqualTo("Alice"));
    }

    [Test]
    public async Task AiStart_oppo_info_reflects_roster_pick()
    {
        await using var factory = new SVSimTestFactory();
        var viewerId = await factory.SeedViewerAsync(displayName: "PlayerA");
        await factory.SeedGlobalsAsync();
        await factory.SeedDeckAsync(viewerId, Format.Rotation, 1);
        await RegisterBotBattleAsync(factory, viewerId, Format.Rotation, deckNo: 1);
        var client = factory.CreateAuthenticatedClient(viewerId);

        var resp = await client.PostAsJsonAsync("/ai_rotation_rank_battle/start", EmptyAuthedBody);
        using var doc = JsonDocument.Parse(await resp.Content.ReadAsStringAsync());
        var oppoInfo = doc.RootElement.GetProperty("oppo_info");

        // BotRoster's stub names contain "AI" — verify the roster was consulted.
        Assert.That(oppoInfo.GetProperty("userName").GetString(), Does.Contain("AI"));
        Assert.That(oppoInfo.GetProperty("classId").GetInt32(), Is.InRange(1, 8));
    }

    [Test]
    public async Task AiStart_self_info_class_matches_queued_deck_number()
    {
        // Regression for the 2026-06-02 "queued Bloodcraft, saw Swordcraft leader" wire bug.
        // The original impl rebuilt MatchContext from deck #1 inside AiStart; the fix routes
        // it through the PendingBattle the bridge stored at do_matching time (which carries
        // the queue-time deck_no). Seed two distinct-class decks and confirm /ai_*/start
        // returns the right class for a viewer registered with deck #5.
        await using var factory = new SVSimTestFactory();
        var viewerId = await factory.SeedViewerAsync(displayName: "Ranker");
        await factory.SeedGlobalsAsync();
        await factory.SeedDeckAsync(viewerId, Format.Unlimited, number: 1, classId: 1);
        await factory.SeedDeckAsync(viewerId, Format.Unlimited, number: 5, classId: 6);
        await RegisterBotBattleAsync(factory, viewerId, Format.Unlimited, deckNo: 5);
        var client = factory.CreateAuthenticatedClient(viewerId);

        var resp = await client.PostAsJsonAsync("/ai_unlimited_rank_battle/start", EmptyAuthedBody);
        using var doc = JsonDocument.Parse(await resp.Content.ReadAsStringAsync());
        var selfInfo = doc.RootElement.GetProperty("self_info");

        Assert.That(selfInfo.GetProperty("classId").GetInt32(), Is.EqualTo(6),
            "Self class must reflect the deck the viewer queued with (deck #5 = Bloodcraft, class 6).");
    }

    [Test]
    public async Task AiStart_without_pending_battle_returns_neg1_sentinel()
    {
        // Defensive: clients always do_matching before ai_start, but if /ai_*/start is hit
        // without a registered PendingBattle (server restart, expired match, ...), the spec
        // sentinel ai_id=-1 surfaces the "no AI assigned" error in the client.
        await using var factory = new SVSimTestFactory();
        var viewerId = await factory.SeedViewerAsync();
        await factory.SeedGlobalsAsync();
        await factory.SeedDeckAsync(viewerId, Format.Rotation, 1);
        var client = factory.CreateAuthenticatedClient(viewerId);

        var resp = await client.PostAsJsonAsync("/ai_rotation_rank_battle/start", EmptyAuthedBody);
        using var doc = JsonDocument.Parse(await resp.Content.ReadAsStringAsync());

        Assert.That(doc.RootElement.GetProperty("ai_id").GetInt32(), Is.EqualTo(-1));
    }

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

        var resp = await client.PostAsJsonAsync("/ai_rotation_rank_battle/finish", FinishBody(battleResult: 1));

        Assert.That(resp.IsSuccessStatusCode, Is.True);
        using var doc = JsonDocument.Parse(await resp.Content.ReadAsStringAsync());
        var data = doc.RootElement;
        Assert.That(data.GetProperty("battle_result").GetInt32(), Is.EqualTo(1));
        Assert.That(data.GetProperty("rank").GetInt32(), Is.EqualTo(0));
        Assert.That(data.GetProperty("after_battle_point").GetInt32(), Is.EqualTo(0));
        Assert.That(data.GetProperty("class_level").GetInt32(), Is.EqualTo(1));
    }

    [Test]
    public async Task Finish_with_consistency_result_echoes_2()
    {
        await using var factory = new SVSimTestFactory();
        var viewerId = await factory.SeedViewerAsync();
        var client = factory.CreateAuthenticatedClient(viewerId);

        var resp = await client.PostAsJsonAsync("/rotation_rank_battle/finish", FinishBody(battleResult: 2));

        using var doc = JsonDocument.Parse(await resp.Content.ReadAsStringAsync());
        Assert.That(doc.RootElement.GetProperty("battle_result").GetInt32(), Is.EqualTo(2));
    }
}