using BuildFlow.Shared.Domain.Errors;
using BuildFlow.Shared.Domain.Exceptions;
using FluentAssertions;
using Scripting.Application.Handlers;
using Scripting.Application.Queries;
using Scripting.Application.Services;
using Scripting.Domain.Entities.ScriptExecutionLog;
using Scripting.Domain.Entities.ScriptFunction;
using Scripting.Domain.Enums;
using Scripting.Infrastructure.Persistence;
using Xunit;

namespace BuildFlow.Scripting.Tests;

/// <summary>
/// scripting 模块查询处理器测试（架构护栏：每个 Handler 至少 1 个测试）。
/// 用真实 InMemory ScriptingDbContext 直接实例化 handler，覆盖：
/// GetScriptDetail（成功 + 不存在→NotFound）、
/// GetScriptExecutionLogs（成功 + 状态过滤 + 空结果）、
/// GetScriptList（成功 + 状态过滤 + 关键字过滤 + 空结果）、
/// GetScriptAssemblyList / GetScriptTypeMeta（委托 ScriptTypeRegistry 的过滤/分页/去重排序）。
/// </summary>
public class ScriptQueryHandlerTests
{
    // ── GetScriptDetail ────────────────────────────────────────────────────

    [Fact]
    public async Task GetScriptDetail_Existing_ReturnsDto()
    {
        await using var db = ScriptingTestDbFactory.Create();
        var script = await SeedScriptAsync(db, "detail-fn", ScriptStatusEnum.Published);
        var handler = new GetScriptDetailQueryHandler(db);

        var dto = await handler.Handle(new GetScriptDetailQuery(script.Id), CancellationToken.None);

        dto.Should().NotBeNull();
        dto.Id.Should().Be(script.Id);
        dto.Name.Should().Be("detail-fn");
        dto.Status.Should().Be(ScriptStatusEnum.Published);
    }

    [Fact]
    public async Task GetScriptDetail_NotFound_Throws()
    {
        await using var db = ScriptingTestDbFactory.Create();
        var handler = new GetScriptDetailQueryHandler(db);

        var act = async () => await handler.Handle(
            new GetScriptDetailQuery(Guid.NewGuid()), CancellationToken.None);

        var ex = await act.Should().ThrowAsync<BusinessException>();
        ex.Which.Code.Should().Be(ErrorCode.NotFound);
    }

    // ── GetScriptExecutionLogs ─────────────────────────────────────────────

    [Fact]
    public async Task GetScriptExecutionLogs_Existing_ReturnsLogs()
    {
        await using var db = ScriptingTestDbFactory.Create();
        var script = await SeedScriptAsync(db, "log-fn");
        await SeedLogAsync(db, script.Id, ScriptExecutionStatusEnum.Success);
        var handler = new GetScriptExecutionLogsQueryHandler(db);

        var result = await handler.Handle(
            new GetScriptExecutionLogsQuery(script.Id, 1, 20), CancellationToken.None);

        result.Items.Should().HaveCount(1);
        result.Total.Should().Be(1);
        result.Items[0].ScriptId.Should().Be(script.Id);
        result.Items[0].Status.Should().Be(ScriptExecutionStatusEnum.Success);
    }

    [Fact]
    public async Task GetScriptExecutionLogs_StatusFilter_ReturnsOnlyMatching()
    {
        await using var db = ScriptingTestDbFactory.Create();
        var script = await SeedScriptAsync(db, "log-filter-fn");
        await SeedLogAsync(db, script.Id, ScriptExecutionStatusEnum.Success);
        await SeedLogAsync(db, script.Id, ScriptExecutionStatusEnum.Failed);
        var handler = new GetScriptExecutionLogsQueryHandler(db);

        var result = await handler.Handle(
            new GetScriptExecutionLogsQuery(script.Id, 1, 20, ScriptExecutionStatusEnum.Success),
            CancellationToken.None);

        result.Items.Should().HaveCount(1);
        result.Items[0].Status.Should().Be(ScriptExecutionStatusEnum.Success);
    }

    [Fact]
    public async Task GetScriptExecutionLogs_NoLogs_ReturnsEmpty()
    {
        await using var db = ScriptingTestDbFactory.Create();
        var script = await SeedScriptAsync(db, "log-empty-fn");
        var handler = new GetScriptExecutionLogsQueryHandler(db);

        var result = await handler.Handle(
            new GetScriptExecutionLogsQuery(script.Id, 1, 20), CancellationToken.None);

        result.Items.Should().BeEmpty();
        result.Total.Should().Be(0);
    }

    // ── GetScriptList ──────────────────────────────────────────────────────

    [Fact]
    public async Task GetScriptList_ReturnsAllSeeded()
    {
        await using var db = ScriptingTestDbFactory.Create();
        await SeedScriptAsync(db, "list-a", ScriptStatusEnum.Published);
        await SeedScriptAsync(db, "list-b", ScriptStatusEnum.Draft);
        var handler = new GetScriptListQueryHandler(db);

        var result = await handler.Handle(
            new GetScriptListQuery(1, 20, null, null), CancellationToken.None);

        result.Total.Should().Be(2);
        result.Items.Should().HaveCount(2);
    }

    [Fact]
    public async Task GetScriptList_StatusFilter_ReturnsOnlyMatching()
    {
        await using var db = ScriptingTestDbFactory.Create();
        await SeedScriptAsync(db, "list-pub", ScriptStatusEnum.Published);
        await SeedScriptAsync(db, "list-draft", ScriptStatusEnum.Draft);
        var handler = new GetScriptListQueryHandler(db);

        var result = await handler.Handle(
            new GetScriptListQuery(1, 20, ScriptStatusEnum.Published, null), CancellationToken.None);

        result.Items.Should().HaveCount(1);
        result.Items[0].Status.Should().Be(ScriptStatusEnum.Published);
    }

    [Fact]
    public async Task GetScriptList_KeywordFilter_MatchesNameOrDisplayName()
    {
        await using var db = ScriptingTestDbFactory.Create();
        await SeedScriptAsync(db, "alpha-fn", displayName: "Alpha 显示");
        await SeedScriptAsync(db, "beta-fn", displayName: "Beta 显示");
        var handler = new GetScriptListQueryHandler(db);

        var result = await handler.Handle(
            new GetScriptListQuery(1, 20, null, "alpha"), CancellationToken.None);

        result.Items.Should().HaveCount(1);
        result.Items[0].Name.Should().Be("alpha-fn");
    }

    [Fact]
    public async Task GetScriptList_NoMatch_ReturnsEmpty()
    {
        await using var db = ScriptingTestDbFactory.Create();
        await SeedScriptAsync(db, "present-fn");
        var handler = new GetScriptListQueryHandler(db);

        var result = await handler.Handle(
            new GetScriptListQuery(1, 20, null, "absent"), CancellationToken.None);

        result.Items.Should().BeEmpty();
        result.Total.Should().Be(0);
    }

    // ── GetScriptAssemblyList ──────────────────────────────────────────────

    [Fact]
    public async Task GetScriptAssemblyList_ReturnsDistinctSortedAssemblies()
    {
        var registry = new ScriptTypeRegistry();
        registry.Scan();
        var handler = new GetScriptAssemblyListQueryHandler(registry);

        var result = await handler.Handle(new GetScriptAssemblyListQuery(), CancellationToken.None);

        result.Should().NotBeNull();
        // 去重：每条只出现一次
        result.Distinct().Should().HaveCount(result.Count, "handler 应做 Distinct");
        // 排序：与直接基于 registry 计算的结果一致
        var expected = registry.GetAll()
            .Select(m => m.Assembly)
            .Distinct()
            .OrderBy(a => a)
            .ToList();
        result.Should().ContainInOrder(expected);
    }

    // ── GetScriptTypeMeta ──────────────────────────────────────────────────

    [Fact]
    public async Task GetScriptTypeMeta_All_ReturnsPagedMeta()
    {
        var registry = new ScriptTypeRegistry();
        registry.Scan();
        var handler = new GetScriptTypeMetaQueryHandler(registry);

        var page = await handler.Handle(
            new GetScriptTypeMetaQuery(null, null, 1, 50), CancellationToken.None);

        page.Items.Should().NotBeNull();
        page.Items.Count.Should().BeLessThanOrEqualTo(50);
        page.PageIndex.Should().Be(1);
        page.PageSize.Should().Be(50);
        page.Total.Should().BeGreaterThanOrEqualTo(0);
    }

    [Fact]
    public async Task GetScriptTypeMeta_KindFilter_ReturnsOnlyThatKind()
    {
        var registry = new ScriptTypeRegistry();
        registry.Scan();
        var handler = new GetScriptTypeMetaQueryHandler(registry);

        var expectedTotal = registry.Total(null, "Query");
        if (expectedTotal == 0) return; // 无 Query 类型时跳过，避免误判

        var page = await handler.Handle(
            new GetScriptTypeMetaQuery(null, "Query", 1, 100), CancellationToken.None);

        page.Items.Should().OnlyContain(m => m.Kind == "Query");
        page.Total.Should().Be(expectedTotal);
    }

    // ── 夹具 ───────────────────────────────────────────────────────────────

    private static async Task<ScriptFunctionEntity> SeedScriptAsync(
        ScriptingDbContext db,
        string name,
        ScriptStatusEnum status = ScriptStatusEnum.Draft,
        string? displayName = null)
    {
        var script = new ScriptFunctionEntity
        {
            Id = Guid.NewGuid(),
            Name = name,
            DisplayName = displayName ?? name,
            Code = "return 1;",
            Status = status,
            Version = 1,
            TimeoutMs = 5000,
            CreatedBy = "test",
            UpdatedBy = "test",
            OperatorIP = "127.0.0.1",
        };
        db.Scripts.Add(script);
        await db.SaveChangesAsync();
        return script;
    }

    private static async Task<ScriptExecutionLogEntity> SeedLogAsync(
        ScriptingDbContext db,
        Guid functionId,
        ScriptExecutionStatusEnum status,
        string functionName = "fn")
    {
        var log = new ScriptExecutionLogEntity
        {
            Id = Guid.NewGuid(),
            FunctionId = functionId,
            FunctionName = functionName,
            Status = status,
            InputJson = "{}",
            CreatedBy = "test",
            UpdatedBy = "test",
        };
        db.ScriptExecutionLogs.Add(log);
        await db.SaveChangesAsync();
        return log;
    }
}