using MessageService.Domain.Entities;
using MessageService.Domain.Enums;
using MessageService.Infrastructure;
using MessageService.Infrastructure.Reposities;
using MessageService.Domain.KeyObjects;
using Microsoft.EntityFrameworkCore;
using Microsoft.EntityFrameworkCore.Infrastructure;
using Microsoft.EntityFrameworkCore.Migrations;
using MySqlConnector;
using Testcontainers.MySql;
using Xunit;

namespace MessageService.Tests;

public sealed class ConversationUniquenessTests : IAsyncLifetime
{
    private readonly MySqlContainer mysql = new MySqlBuilder("mysql:8.0").Build();

    public Task InitializeAsync() =>
        string.Equals(Environment.GetEnvironmentVariable("RUN_DOCKER_TESTS"), "1", StringComparison.Ordinal)
            ? mysql.StartAsync()
            : Task.CompletedTask;

    public Task DisposeAsync() => mysql.DisposeAsync().AsTask();

    [DockerFact]
    [Trait("Category", "Docker")]
    public async Task Migration_deduplicates_active_rows_and_enforces_active_uniqueness()
    {
        await using var db = CreateContext();
        var migrator = db.Database.GetService<IMigrator>();
        await migrator.MigrateAsync("20260909000100_ApiAlignmentFixes");

        var userId = Guid.NewGuid();
        var targetId = Guid.NewGuid();
        await InsertConversationAsync(db, Guid.NewGuid(), userId, targetId, 2, 10, new DateTimeOffset(2026, 1, 1, 0, 0, 0, TimeSpan.Zero));
        await InsertConversationAsync(db, Guid.NewGuid(), userId, targetId, 7, 15, new DateTimeOffset(2026, 2, 1, 0, 0, 0, TimeSpan.Zero));

        await migrator.MigrateAsync();

        var all = await db.Conversations.IgnoreQueryFilters().AsNoTracking().ToListAsync();
        var active = all.Single(x => !x.IsDeleted);
        Assert.Equal(2, all.Count);
        Assert.Equal(7, active.UnreadCount);
        Assert.Equal(15, active.LastReadSequenceId);

        await Assert.ThrowsAsync<MySqlException>(() =>
            InsertConversationAsync(db, Guid.NewGuid(), userId, targetId, 0, null, DateTimeOffset.UtcNow));

        db.ChangeTracker.Clear();
        var trackedActive = await db.Conversations.SingleAsync();
        trackedActive.SoftDelete();
        await db.SaveChangesAsync();
        await InsertConversationAsync(db, Guid.NewGuid(), userId, targetId, 0, null, DateTimeOffset.UtcNow);
        Assert.Equal(1, await db.Conversations.CountAsync());
    }

    [DockerFact]
    [Trait("Category", "Docker")]
    public async Task Repository_uses_exact_active_lookup_and_orders_owner_list_newest_first()
    {
        await using var db = CreateContext();
        await db.Database.MigrateAsync();
        var userId = Guid.NewGuid();
        var firstTarget = Guid.NewGuid();
        var secondTarget = Guid.NewGuid();
        await InsertConversationAsync(db, Guid.NewGuid(), userId, firstTarget, 0, null, new DateTimeOffset(2026, 1, 1, 0, 0, 0, TimeSpan.Zero));
        await InsertConversationAsync(db, Guid.NewGuid(), userId, secondTarget, 0, null, new DateTimeOffset(2026, 2, 1, 0, 0, 0, TimeSpan.Zero));
        var repository = new ConversationReposity(db);

        var exact = await repository.FindActiveAsync(userId, firstTarget, ChatType.PRIVATE);
        var list = (await repository.ListByUserIdAsync(userId)).ToList();

        Assert.NotNull(exact);
        Assert.Equal(firstTarget, exact.TargetId);
        Assert.Equal(secondTarget, list[0].TargetId);
    }

    [DockerFact]
    [Trait("Category", "Docker")]
    public async Task Message_search_is_scoped_filtered_and_uses_an_exclusive_cursor()
    {
        await using var db = CreateContext();
        await db.Database.MigrateAsync();
        var senderId = Guid.NewGuid();
        var targetId = Guid.NewGuid();
        var context = new MessageCreateContext(ChatType.PRIVATE, Guid.NewGuid(), senderId, targetId);
        var first = Message.BuildTxt(context, "项目进度 一", 1);
        var second = Message.BuildTxt(context with { ClientMsgId = Guid.NewGuid() }, "项目进度 二", 2);
        var withdrawn = Message.BuildTxt(context with { ClientMsgId = Guid.NewGuid() }, "项目进度 已撤回", 3);
        withdrawn.Withdraw();
        var image = Message.BuildImg(context with { ClientMsgId = Guid.NewGuid() }, "image", 10, 10, "thumb", 4);
        var other = Message.BuildTxt(
            new MessageCreateContext(ChatType.GROUP, Guid.NewGuid(), senderId, Guid.NewGuid()),
            "项目进度 其他会话",
            5);
        db.Messages.AddRange(first, second, withdrawn, image, other);
        await db.SaveChangesAsync();
        var repository = new MessageReposity(db);

        var firstPage = await repository.SearchAsync(first.StreamKey, "项目进度", null, 1);
        var secondPage = await repository.SearchAsync(first.StreamKey, "项目进度", firstPage.messages.Single().SequenceId, 10);

        Assert.True(firstPage.hasMore);
        Assert.Equal(2, firstPage.messages.Single().SequenceId);
        Assert.False(secondPage.hasMore);
        Assert.Equal(1, secondPage.messages.Single().SequenceId);
    }

    private MessageDbContext CreateContext()
    {
        var connectionString = mysql.GetConnectionString();
        var options = new DbContextOptionsBuilder<MessageDbContext>()
            .UseMySql(
                connectionString,
                new MySqlServerVersion(new Version(8, 0)),
                mysqlOptions => mysqlOptions.EnableRetryOnFailure(3, TimeSpan.FromSeconds(2), null))
            .Options;
        return new MessageDbContext(options, null!);
    }

    private static Task InsertConversationAsync(
        MessageDbContext db,
        Guid id,
        Guid userId,
        Guid targetId,
        int unreadCount,
        long? lastReadSequenceId,
        DateTimeOffset modificationTime)
    {
        return db.Database.ExecuteSqlInterpolatedAsync($"""
            INSERT INTO `conversations`
                (`Id`, `UserId`, `TargetId`, `TargetAvatar`, `TargetName`, `LastReadSequenceId`,
                 `UnreadCount`, `ChatType`, `StreamKey`, `LastMessage`, `CreationTime`,
                 `ModificationTime`, `IsDeleted`, `Deletion`)
            VALUES
                ({id}, {userId}, {targetId}, {string.Empty}, {"target"}, {lastReadSequenceId},
                 {unreadCount}, {(int)ChatType.PRIVATE}, {"private-stream"}, {string.Empty}, {modificationTime},
                 {modificationTime}, {false}, {null});
            """);
    }
}

public sealed class DockerFactAttribute : FactAttribute
{
    public DockerFactAttribute()
    {
        if (!string.Equals(Environment.GetEnvironmentVariable("RUN_DOCKER_TESTS"), "1", StringComparison.Ordinal))
        {
            Skip = "Set RUN_DOCKER_TESTS=1 when a Docker daemon is available.";
        }
    }
}