using w4c_workflows.Data;
using w4c_workflows.Models;
using w4c_workflows.Services;
using Xunit;

namespace w4c_workflows.Tests;

/// <summary>Shared compile-and-persist helpers for lifecycle/dispatcher tests.</summary>
internal static class WorkflowDataHelpers
{
    public const string LinearYaml = """
        name: linear
        mode: function
        language: shell
        entry: { file: root.sh }
        tasks:
          - id: a
            parent: root
            next: b
            language: shell
            entry: { file: a.sh }
          - id: b
            parent: root
            language: shell
            entry: { file: b.sh }
        """;

    public const string DurableYaml = """
        name: durable
        mode: durable
        language: shell
        entry: { file: root.sh }
        tasks:
          - id: a
            parent: root
            language: shell
            entry: { file: a.sh }
        """;

    /// <summary>Three-task success chain where every chained task declares its own
    /// compensation (<c>onError</c>) target, for saga reverse-compensation tests.</summary>
    public const string SagaYaml = """
        name: saga
        mode: function
        language: shell
        entry: { file: root.sh }
        tasks:
          - id: a
            parent: root
            next: b
            onError: compensate_a
            language: shell
            entry: { file: a.sh }
          - id: b
            parent: root
            next: c
            onError: compensate_b
            language: shell
            entry: { file: b.sh }
          - id: c
            parent: root
            onError: compensate_c
            language: shell
            entry: { file: c.sh }
          - id: compensate_a
            parent: root
            language: shell
            entry: { file: compensate_a.sh }
          - id: compensate_b
            parent: root
            language: shell
            entry: { file: compensate_b.sh }
          - id: compensate_c
            parent: root
            language: shell
            entry: { file: compensate_c.sh }
        """;

    public static Workflow CompileAndSave(WorkflowsDbContext db, string tenantId, string yaml, string path = "workflows/linear.yaml")
    {
        var compiler = new WorkflowCompiler(new WorkflowValidator(new LanguageRegistry()));
        var result = compiler.Compile(yaml, path, tenantId);
        Assert.True(result.Success, string.Join("\n", result.Errors));

        var workflow = result.Workflow!.Workflow;
        workflow.Tasks = result.Workflow.Tasks.ToList();

        db.Workflows.Add(workflow);
        db.SaveChanges();
        return workflow;
    }

    public static WorkflowTask TaskByKey(Workflow workflow, string key)
        => workflow.Tasks.Single(t => t.Key == key);

    public static WorkflowRun AddPendingRun(WorkflowsDbContext db, Workflow workflow, string? input = null, Guid? startTaskId = null)
    {
        var run = new WorkflowRun
        {
            Id = Guid.NewGuid(),
            WorkflowId = workflow.Id,
            TenantId = workflow.TenantId,
            Status = RunStatus.Pending,
            TriggerJson = "{\"type\":\"event\"}",
            InputJson = input,
            CorrelationId = "test-correlation",
            StartTaskId = startTaskId,
        };
        db.WorkflowRuns.Add(run);
        db.SaveChanges();
        return run;
    }

    /// <summary>Adds a run in a terminal/in-flight status with an explicit start time.</summary>
    public static WorkflowRun AddRun(WorkflowsDbContext db, Workflow workflow, string status, DateTime? startedAt = null, DateTime? finishedAt = null, string? error = null)
    {
        var run = new WorkflowRun
        {
            Id = Guid.NewGuid(),
            WorkflowId = workflow.Id,
            TenantId = workflow.TenantId,
            Status = status,
            TriggerJson = "{\"type\":\"event\"}",
            CorrelationId = $"corr-{Guid.NewGuid():N}",
            StartedAt = startedAt,
            FinishedAt = finishedAt,
            Error = error,
        };
        db.WorkflowRuns.Add(run);
        db.SaveChanges();
        return run;
    }
}