using System.Text.Json;
using Tau.Acuvim.Console.Models;
using Tau.Acuvim.Console.Services;

namespace Tau.Acuvim.Console.Tests;

public class CommandServiceTests
{
    private CommandService CreateService(Data.AppDbContext db)
        => new(db, TestHelpers.CreateLogger<CommandService>());

    [Fact]
    public async Task CreateAsync_CreatesCommand_WithPendingStatus()
    {
        using var db = TestHelpers.CreateDbContext();
        var svc = CreateService(db);

        var cmd = await svc.CreateAsync("DEV-C1", "reboot", null, "admin");

        Assert.Equal("DEV-C1", cmd.DeviceId);
        Assert.Equal("reboot", cmd.CommandName);
        Assert.Equal("pending", cmd.Status);
        Assert.Equal("admin", cmd.CreatedBy);
        Assert.StartsWith("cmd-", cmd.RequestId);
        Assert.Single(db.Commands);
    }

    [Fact]
    public async Task MarkSentAsync_UpdatesStatus()
    {
        using var db = TestHelpers.CreateDbContext();
        var svc = CreateService(db);

        var cmd = await svc.CreateAsync("DEV-C2", "reset", null, "admin");

        await svc.MarkSentAsync(cmd.RequestId);

        var updated = db.Commands.First(c => c.RequestId == cmd.RequestId);
        Assert.Equal("sent", updated.Status);
        Assert.NotNull(updated.SentAt);
    }

    [Fact]
    public async Task ProcessResponseAsync_CompletesCommand()
    {
        using var db = TestHelpers.CreateDbContext();
        var svc = CreateService(db);

        var cmd = await svc.CreateAsync("DEV-C3", "ping", null, "admin");
        await svc.MarkSentAsync(cmd.RequestId);

        var responsePayload = JsonSerializer.Serialize(new
        {
            request_id = cmd.RequestId,
            status = "success",
            data = "pong"
        });

        await svc.ProcessResponseAsync("DEV-C3", responsePayload);

        var updated = db.Commands.First(c => c.RequestId == cmd.RequestId);
        Assert.Equal("success", updated.Status);
        Assert.NotNull(updated.Response);
        Assert.NotNull(updated.CompletedAt);
    }

    [Fact]
    public async Task ProcessResponseAsync_IgnoresUnknownRequestId()
    {
        using var db = TestHelpers.CreateDbContext();
        var svc = CreateService(db);

        var responsePayload = JsonSerializer.Serialize(new
        {
            request_id = "cmd-unknown",
            status = "success"
        });

        // Should not throw
        await svc.ProcessResponseAsync("DEV-C4", responsePayload);

        Assert.Empty(db.Commands);
    }

    [Fact]
    public async Task BuildCommandPayload_IncludesCommandAndRequestId()
    {
        using var db = TestHelpers.CreateDbContext();
        var svc = CreateService(db);

        var cmd = await svc.CreateAsync("DEV-C5", "firmware_update", null, "admin");

        var json = svc.BuildCommandPayload(cmd);
        using var doc = JsonDocument.Parse(json);
        var root = doc.RootElement;

        Assert.Equal("firmware_update", root.GetProperty("cmd").GetString());
        Assert.Equal(cmd.RequestId, root.GetProperty("request_id").GetString());
    }

    [Fact]
    public async Task TimeoutStalCommandsAsync_TimesOutOldCommands()
    {
        using var db = TestHelpers.CreateDbContext();
        var svc = CreateService(db);

        // Create a command and mark it as sent with an old SentAt time
        var cmd = new Command
        {
            Id = Guid.NewGuid(),
            DeviceId = "DEV-C6",
            RequestId = $"cmd-{Guid.NewGuid():N}",
            CommandName = "check",
            Status = "sent",
            SentAt = DateTime.UtcNow.AddSeconds(-120)
        };
        db.Commands.Add(cmd);

        // Also add a recent sent command that should NOT be timed out
        var recentCmd = new Command
        {
            Id = Guid.NewGuid(),
            DeviceId = "DEV-C6",
            RequestId = $"cmd-{Guid.NewGuid():N}",
            CommandName = "check2",
            Status = "sent",
            SentAt = DateTime.UtcNow
        };
        db.Commands.Add(recentCmd);
        await db.SaveChangesAsync();

        var count = await svc.TimeoutStalCommandsAsync(timeoutSeconds: 60);

        Assert.Equal(1, count);

        var timedOut = db.Commands.First(c => c.RequestId == cmd.RequestId);
        Assert.Equal("timeout", timedOut.Status);
        Assert.NotNull(timedOut.CompletedAt);

        var stillSent = db.Commands.First(c => c.RequestId == recentCmd.RequestId);
        Assert.Equal("sent", stillSent.Status);
    }
}