using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Options;
using NeonSprawl.Server.Game.PositionState;
using NeonSprawl.Server.Game.Quests;
using NeonSprawl.Server.Tests.Game.PositionState;
using Npgsql;
using Xunit;

namespace NeonSprawl.Server.Tests.Game.Quests;

[Collection("Postgres integration")]
public sealed class PlayerQuestProgressPersistenceIntegrationTests(PostgresIntegrationHarness harness)
{
    private PostgresWebApplicationFactory Factory => harness.Factory;

    private const string PlayerId = "dev-local-1";
    private static readonly DateTimeOffset CompletedAt = new(2026, 6, 3, 14, 30, 0, TimeSpan.Zero);

    [RequirePostgresFact]
    public async Task TryActivate_ShouldReturnOneTrueAndRestFalse_WhenCalledConcurrently()
    {
        // Arrange
        await ResetQuestProgressTableAsync();
        const int concurrentCalls = 8;
        const string questId = PrototypeE7M1QuestCatalogRules.GatherIntroQuestId;

        // Act
        var results = await Task.WhenAll(
            Enumerable.Range(0, concurrentCalls).Select(_ => Task.Run(() =>
            {
                using var scope = Factory.Services.CreateScope();
                var store = scope.ServiceProvider.GetRequiredService<IPlayerQuestStateStore>();
                return store.TryActivate(PlayerId, questId, out QuestStepState _);
            })));

        // Assert
        Assert.Equal(1, results.Count(static r => r));
        Assert.Equal(concurrentCalls - 1, results.Count(static r => !r));
        Assert.True(
            Factory.Services.CreateScope().ServiceProvider
                .GetRequiredService<IPlayerQuestStateStore>()
                .TryGetProgress(PlayerId, questId, out var snapshot));
        Assert.Equal(QuestProgressStatus.Active, snapshot.Status);
        Assert.Equal(0, snapshot.CurrentStepIndex);
    }

    [RequirePostgresFact]
    public async Task ActivateCounterComplete_ShouldPersistAcrossNewFactory()
    {
        // Arrange
        await ResetQuestProgressTableAsync();

        // Act — write through first host
        using (var firstScope = Factory.Services.CreateScope())
        {
            var store = firstScope.ServiceProvider.GetRequiredService<IPlayerQuestStateStore>();
            Assert.True(store.TryActivate(PlayerId, PrototypeE7M1QuestCatalogRules.GatherIntroQuestId, out _));
            Assert.True(store.TryUpdateObjectiveCounter(
                PlayerId,
                PrototypeE7M1QuestCatalogRules.GatherIntroQuestId,
                PrototypeE7M1QuestCatalogRules.GatherIntroFirstObjectiveId,
                3,
                out _));
            Assert.True(store.TryMarkComplete(
                PlayerId,
                PrototypeE7M1QuestCatalogRules.GatherIntroQuestId,
                CompletedAt,
                out _));
        }

        // Act — read back through a fresh host
        QuestStepState readBack;
        await using var secondFactory = new PostgresWebApplicationFactory();
        using var secondScope = secondFactory.Services.CreateScope();
        var readStore = secondScope.ServiceProvider.GetRequiredService<IPlayerQuestStateStore>();
        readBack = readStore.TryGetProgress(
            PlayerId,
            PrototypeE7M1QuestCatalogRules.GatherIntroQuestId,
            out var snapshot)
            ? snapshot
            : null!;

        // Assert
        Assert.NotNull(readBack);
        Assert.Equal(QuestProgressStatus.Completed, readBack.Status);
        Assert.Equal(0, readBack.CurrentStepIndex);
        Assert.Equal(3, readBack.ObjectiveCounters[PrototypeE7M1QuestCatalogRules.GatherIntroFirstObjectiveId]);
        Assert.Equal(CompletedAt, readBack.CompletedAt);
    }

    [RequirePostgresFact]
    public async Task TryClearProgress_ShouldRemoveRowAndPersistAcrossNewFactory()
    {
        // Arrange
        await ResetQuestProgressTableAsync();
        const string questId = PrototypeE7M1QuestCatalogRules.GatherIntroQuestId;

        // Act
        using (var firstScope = Factory.Services.CreateScope())
        {
            var store = firstScope.ServiceProvider.GetRequiredService<IPlayerQuestStateStore>();
            Assert.True(store.TryActivate(PlayerId, questId, out _));
            Assert.True(store.TryMarkComplete(PlayerId, questId, CompletedAt, out _));
            Assert.True(store.TryClearProgress(PlayerId, questId));
            Assert.False(store.TryGetProgress(PlayerId, questId, out _));
        }

        var readBackExists = false;
        await using var secondFactory = new PostgresWebApplicationFactory();
        using var secondScope = secondFactory.Services.CreateScope();
        var readStore = secondScope.ServiceProvider.GetRequiredService<IPlayerQuestStateStore>();
        readBackExists = readStore.TryGetProgress(PlayerId, questId, out _);

        // Assert
        Assert.False(readBackExists);
    }

    private async Task ResetQuestProgressTableAsync()
    {
        var cs = Environment.GetEnvironmentVariable("ConnectionStrings__NeonSprawl");
        if (string.IsNullOrWhiteSpace(cs))
        {
            throw new InvalidOperationException("ConnectionStrings__NeonSprawl is not set.");
        }

        _ = Factory.Services;
        var options = Factory.Services.GetRequiredService<IOptions<GamePositionOptions>>().Value;

        var positionDdlPath = Path.Combine(AppContext.BaseDirectory, "db", "migrations", "V001__player_position.sql");
        var questDdlPath = Path.Combine(AppContext.BaseDirectory, "db", "migrations", "V008__player_quest_progress.sql");
        if (!File.Exists(positionDdlPath) || !File.Exists(questDdlPath))
        {
            throw new FileNotFoundException("Test DDL for quest progress persistence not found.");
        }

        var positionDdl = await File.ReadAllTextAsync(positionDdlPath);
        var questDdl = await File.ReadAllTextAsync(questDdlPath);
        await using var conn = new NpgsqlConnection(cs);
        await conn.OpenAsync();
        await using var applyPosition = new NpgsqlCommand(positionDdl, conn);
        await applyPosition.ExecuteNonQueryAsync();

        await using var truncate = new NpgsqlCommand("TRUNCATE player_position CASCADE;", conn);
        await truncate.ExecuteNonQueryAsync();

        PostgresPositionBootstrap.SeedDevPlayer(conn, options);

        await using var applyQuest = new NpgsqlCommand(questDdl, conn);
        await applyQuest.ExecuteNonQueryAsync();
    }
}