using System.Text.Json;
using FluentAssertions;
using Workflow.Application.Engine;
using Workflow.Application.Features.WorkflowDefinitions.Commands;
using Workflow.Application.Features.WorkflowDefinitions.Handlers;
using Workflow.Domain.Entities;
using Workflow.Domain.Enums;
using Xunit;

using ShapeMap = global::Workflow.Domain.Engine.WorkflowShapeMap;

namespace BuildFlow.Workflow.Tests.Integration;

/// <summary>
/// 钉钉式树定义的端到端发布测试：构造带 DefinitionTree 的草稿定义 →
/// 发布 → 验证编译产出 DefinitionJson、通过图校验、生成不可变快照、状态变 Published。
/// 这条链路是「树编辑器保存 → 发布 → 引擎可运行」的核心保障。
/// </summary>
public class TreeDefinitionPublishTests
{
    private static readonly JsonSerializerOptions JsonOptions = new(JsonSerializerDefaults.Web);

    /// <summary>构造一棵典型的钉钉式树：发起人 → 审批 → 条件分支(大额/默认) → 抄送。</summary>
    private static string BuildTreeJson()
    {
        var tree = new
        {
            root = new
            {
                id = Guid.NewGuid().ToString(),
                type = "Initiator",
                config = new { title = "发起人" },
                child = new
                {
                    id = Guid.NewGuid().ToString(),
                    type = "Approval",
                    config = new
                    {
                        title = "主管审批",
                        approvalMode = "countersign",
                        assigneeRules = new[] { "user:11111111-1111-1111-1111-111111111111" },
                    },
                    child = new
                    {
                        id = Guid.NewGuid().ToString(),
                        type = "ConditionBranch",
                        config = new { title = "金额分支" },
                        branches = new object[]
                        {
                            new
                            {
                                id = Guid.NewGuid().ToString(),
                                label = "大额",
                                condition = "amount > 5000",
                                child = new
                                {
                                    id = Guid.NewGuid().ToString(),
                                    type = "Approval",
                                    config = new
                                    {
                                        title = "总监审批",
                                        approvalMode = "countersign",
                                        assigneeRules = new[] { "user:22222222-2222-2222-2222-222222222222" },
                                    },
                                },
                            },
                            new
                            {
                                id = Guid.NewGuid().ToString(),
                                label = "默认",
                                condition = (string?)null,
                                child = (object?)null,
                            },
                        },
                        child = new
                        {
                            id = Guid.NewGuid().ToString(),
                            type = "Cc",
                            config = new
                            {
                                title = "抄送财务",
                                recipients = new[] { "user:33333333-3333-3333-3333-333333333333" },
                            },
                        },
                    },
                },
            },
        };
        return JsonSerializer.Serialize(tree, JsonOptions);
    }

    [Fact]
    public async Task Publish_TreeDefinition_CompilesToValidGraph_AndCreatesSnapshot()
    {
        // Arrange：构造一个 Draft 草稿，只填 DefinitionTree（不填 DefinitionJson）
        await using var db = TestDbFactory.Create();
        var definitionId = Guid.NewGuid();
        db.WorkflowDefinitions.Add(new WorkflowDefinition
        {
            Id = definitionId,
            Name = "报销审批",
            Code = $"expense-{definitionId:N}",
            Status = DefinitionStatus.Draft,
            Version = 1,
            IsEnabled = true,
            DefinitionTree = BuildTreeJson(),
        });
        await db.SaveChangesAsync();

        // Act：发布
        var handler = new PublishWorkflowDefinitionCommandHandler(db);
        await handler.Handle(new PublishWorkflowDefinitionCommand(definitionId), CancellationToken.None);

        // Assert：定义状态变 Published、版本自增、DefinitionJson 被编译出来
        var updated = await db.WorkflowDefinitions.FindAsync(definitionId);
        updated.Should().NotBeNull();
        updated!.Status.Should().Be(DefinitionStatus.Published);
        updated.Version.Should().Be(2);
        updated.DefinitionJson.Should().NotBeNullOrEmpty("树必须被编译成图");

        // 编译出的图必须能被引擎解析且通过校验
        var graph = WorkflowGraphParser.Parse(updated.DefinitionJson);
        graph.Nodes.Should().NotBeEmpty();
        var act = () => WorkflowGraphValidator.Validate(graph);
        act.Should().NotThrow("编译产物必须通过发布校验");

        // 图结构断言：含 Start/End/Approval/Cc/Condition
        graph.Nodes.Should().Contain(n => n.Shape == ShapeMap.Shapes.Start);
        graph.Nodes.Should().Contain(n => n.Shape == ShapeMap.Shapes.End);
        graph.Nodes.Should().Contain(n => n.Shape == ShapeMap.Shapes.Approval);
        graph.Nodes.Should().Contain(n => n.Shape == ShapeMap.Shapes.Cc);
        graph.Nodes.Should().Contain(n => n.Shape == ShapeMap.Shapes.Condition);

        // 快照已生成，且 DefinitionTree/DefinitionJson 都写进快照
        var snapshot = db.WorkflowDefinitionSnapshots
            .FirstOrDefault(s => s.DefinitionId == definitionId && s.Version == 2);
        snapshot.Should().NotBeNull();
        snapshot!.DefinitionJson.Should().NotBeNullOrEmpty();
        snapshot.DefinitionTree.Should().NotBeNullOrEmpty("快照应同时保存树供审计回显");
    }

    [Fact]
    public async Task Publish_LegacyDefinitionWithoutTree_StillWorks()
    {
        // 兼容老的自由画布定义（无 DefinitionTree，只有 DefinitionJson）也能发布
        await using var db = TestDbFactory.Create();
        var definitionId = Guid.NewGuid();
        // 手工构造一个最小合法图：Start → End
        var minGraph = new
        {
            nodes = new[]
            {
                new { id = Guid.NewGuid().ToString(), shape = "wf-start", data = new { title = "开始" } },
                new { id = Guid.NewGuid().ToString(), shape = "wf-end", data = new { title = "结束" } },
            },
            edges = new[]
            {
                new
                {
                    id = Guid.NewGuid().ToString(),
                    shape = "wf-edge",
                    source = new { cell = "" },
                    target = new { cell = "" },
                    data = new { edgeType = 0 },
                },
            },
        };
        // 填好 source/target 指向上面两个节点
        var nodes = minGraph.nodes;
        var edges = new[]
        {
            new
            {
                id = Guid.NewGuid().ToString(),
                shape = "wf-edge",
                source = new { cell = nodes[0].id },
                target = new { cell = nodes[1].id },
                data = new { edgeType = 0 },
            },
        };
        var graphJson = JsonSerializer.Serialize(new { nodes, edges }, JsonOptions);

        db.WorkflowDefinitions.Add(new WorkflowDefinition
        {
            Id = definitionId,
            Name = "老流程",
            Code = $"legacy-{definitionId:N}",
            Status = DefinitionStatus.Draft,
            Version = 1,
            IsEnabled = true,
            DefinitionJson = graphJson,
        });
        await db.SaveChangesAsync();

        var handler = new PublishWorkflowDefinitionCommandHandler(db);
        var act = () => handler.Handle(new PublishWorkflowDefinitionCommand(definitionId), CancellationToken.None);
        await act.Should().NotThrowAsync("无树的老定义走原 DefinitionJson 路径");

        var updated = await db.WorkflowDefinitions.FindAsync(definitionId);
        updated!.Status.Should().Be(DefinitionStatus.Published);
    }
}