using ManagerService.Controllers;
using ManagerService.Data;
using ManagerService.DTOs;
using ManagerService.Tests.Infrastructure;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Logging.Abstractions;
using Xunit;

namespace ManagerService.Tests.Controllers
{
    public class SubscriptionPlanControllerTests
    {
        private SubscriptionPlanController BuildController(MyInfoMateDbContext db) =>
            new SubscriptionPlanController(NullLogger<SubscriptionPlanController>.Instance, db);

        // ── GET ──────────────────────────────────────────────────────────────

        [Fact]
        public void Get_ReturnsAllPlans()
        {
            using var db = DbContextFactory.Create();
            db.SubscriptionPlans.AddRange(
                new SubscriptionPlan { Id = "p1", Name = "Starter" },
                new SubscriptionPlan { Id = "p2", Name = "Standard" }
            );
            db.SaveChanges();

            var result = BuildController(db).Get();

            var ok = Assert.IsType<OkObjectResult>(result);
            var plans = Assert.IsAssignableFrom<IEnumerable<SubscriptionPlanDTO>>(ok.Value);
            Assert.Equal(2, plans.Count());
        }

        [Fact]
        public void GetById_ExistingId_ReturnsDto()
        {
            using var db = DbContextFactory.Create();
            db.SubscriptionPlans.Add(new SubscriptionPlan
            {
                Id = "p1", Name = "Starter", StorageQuotaBytes = 1024, AiRequestsPerMonth = 50
            });
            db.SaveChanges();

            var result = BuildController(db).GetById("p1");

            var ok = Assert.IsType<OkObjectResult>(result);
            var dto = Assert.IsType<SubscriptionPlanDTO>(ok.Value);
            Assert.Equal("Starter", dto.name);
            Assert.Equal(1024, dto.storageQuotaBytes);
            Assert.Equal(50, dto.aiRequestsPerMonth);
        }

        [Fact]
        public void GetById_UnknownId_Returns404()
        {
            using var db = DbContextFactory.Create();

            var result = BuildController(db).GetById("unknown");

            Assert.IsType<NotFoundObjectResult>(result);
        }

        // ── CREATE ───────────────────────────────────────────────────────────

        [Fact]
        public void Create_ValidDto_PersistsAndReturnsDto()
        {
            using var db = DbContextFactory.Create();
            var dto = new SubscriptionPlanDTO { name = "Premium", storageQuotaBytes = 5000, aiRequestsPerMonth = 100 };

            var result = BuildController(db).Create(dto);

            var ok = Assert.IsType<OkObjectResult>(result);
            var returned = Assert.IsType<SubscriptionPlanDTO>(ok.Value);
            Assert.Equal("Premium", returned.name);
            Assert.NotNull(returned.id);
            Assert.Equal(1, db.SubscriptionPlans.Count());
        }

        [Fact]
        public void Create_NullDto_Returns400()
        {
            using var db = DbContextFactory.Create();

            var result = BuildController(db).Create(null!);

            Assert.IsType<BadRequestObjectResult>(result);
        }

        // ── UPDATE ───────────────────────────────────────────────────────────

        [Fact]
        public void Update_ExistingPlan_UpdatesName()
        {
            using var db = DbContextFactory.Create();
            db.SubscriptionPlans.Add(new SubscriptionPlan { Id = "p1", Name = "Old" });
            db.SaveChanges();

            var result = BuildController(db).Update(new SubscriptionPlanDTO { id = "p1", name = "New", storageQuotaBytes = 0, aiRequestsPerMonth = 0 });

            Assert.IsType<OkObjectResult>(result);
            Assert.Equal("New", db.SubscriptionPlans.First().Name);
        }

        [Fact]
        public void Update_UnknownId_Returns404()
        {
            using var db = DbContextFactory.Create();

            var result = BuildController(db).Update(new SubscriptionPlanDTO { id = "unknown", name = "X" });

            Assert.IsType<NotFoundObjectResult>(result);
        }

        [Fact]
        public void Update_NullDto_Returns400()
        {
            using var db = DbContextFactory.Create();

            var result = BuildController(db).Update(null!);

            Assert.IsType<BadRequestObjectResult>(result);
        }

        // ── DELETE ───────────────────────────────────────────────────────────

        [Fact]
        public void Delete_UnusedPlan_Returns202()
        {
            using var db = DbContextFactory.Create();
            db.SubscriptionPlans.Add(new SubscriptionPlan { Id = "p1", Name = "Starter" });
            db.SaveChanges();

            var result = BuildController(db).Delete("p1");

            var statusResult = Assert.IsType<ObjectResult>(result);
            Assert.Equal(202, statusResult.StatusCode);
            Assert.Equal(0, db.SubscriptionPlans.Count());
        }

        [Fact]
        public void Delete_PlanUsedByInstance_Returns409()
        {
            using var db = DbContextFactory.Create();
            db.SubscriptionPlans.Add(new SubscriptionPlan { Id = "p1", Name = "Starter" });
            db.Instances.Add(new Instance
            {
                Id = "inst1", Name = "Musée", SubscriptionPlanId = "p1",
                DateCreation = DateTime.UtcNow
            });
            db.SaveChanges();

            var result = BuildController(db).Delete("p1");

            Assert.IsType<ConflictObjectResult>(result);
        }

        [Fact]
        public void Delete_UnknownId_Returns404()
        {
            using var db = DbContextFactory.Create();

            var result = BuildController(db).Delete("unknown");

            Assert.IsType<NotFoundObjectResult>(result);
        }
    }
}