using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Logging.Abstractions;
using w4c_workflows.Data;
using w4c_workflows.Models;
using w4c_workflows.Services;
using w4c_workflows.Services.Runs;
using Xunit;

namespace w4c_workflows.Tests;

[Collection("WorkflowsPostgres")]
public class RunLauncherTests
{
    private const string CronYaml = """
        name: nightly
        mode: function
        language: shell
        trigger:
          type: cron
          cron: "0 9 * * *"
        entry: { file: nightly.sh }
        """;

    private readonly WorkflowsPostgresFixture _fixture;

    public RunLauncherTests(WorkflowsPostgresFixture fixture)
    {
        _fixture = fixture;
    }

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

        db.Workflows.Add(result.Workflow!.Workflow);
        db.Tasks.AddRange(result.Workflow.Tasks);
        db.SaveChanges();
        return result.Workflow.Workflow;
    }

    [Fact]
    public async Task Launch_creates_a_pending_run_with_trigger_input_and_correlation()
    {
        var tenantId = "t" + Guid.NewGuid().ToString("N")[..12];
        await using var db = _fixture.CreateContext();
        var workflow = CompileAndSave(db, tenantId, CronYaml);

        var launcher = new RunLauncher(db, NullLogger<RunLauncher>.Instance);
        var runId = await launcher.LaunchAsync(
            new LaunchRequest(tenantId, workflow.Id, workflow.TriggerJson, "{\"x\":1}", "corr-1"), default);

        var run = await db.WorkflowRuns.SingleAsync(r => r.Id == runId);
        Assert.Equal(workflow.Id, run.WorkflowId);
        Assert.Equal(tenantId, run.TenantId);
        Assert.Equal(RunStatus.Pending, run.Status);
        Assert.Equal(workflow.TriggerJson, run.TriggerJson);
        Assert.Equal("{\"x\":1}", run.InputJson);
        Assert.Equal("corr-1", run.CorrelationId);
        Assert.Null(run.StartedAt);
        Assert.Null(run.FinishedAt);
    }

    [Fact]
    public async Task Launch_rejects_unknown_workflow()
    {
        await using var db = _fixture.CreateContext();
        var launcher = new RunLauncher(db, NullLogger<RunLauncher>.Instance);

        await Assert.ThrowsAsync<InvalidOperationException>(() =>
            launcher.LaunchAsync(new LaunchRequest("t", Guid.NewGuid(), null, null, null), default));
    }

    [Fact]
    public async Task Launch_rejects_workflow_for_another_tenant()
    {
        var tenantId = "t" + Guid.NewGuid().ToString("N")[..12];
        await using var db = _fixture.CreateContext();
        var workflow = CompileAndSave(db, tenantId, CronYaml);

        var launcher = new RunLauncher(db, NullLogger<RunLauncher>.Instance);
        await Assert.ThrowsAsync<InvalidOperationException>(() =>
            launcher.LaunchAsync(new LaunchRequest("other-tenant", workflow.Id, null, null, null), default));
    }
}