using Data.SeaHavenIndustries;
using Data.SeaHavenIndustries.Enums;
using Microsoft.EntityFrameworkCore;
using SeaHaven.DataServices.Implementation;
using SeaHaven.Services.DTOs;
using SeaHaven.Services.Exceptions;
using SeaHaven.Services.Helpers;
using SeaHaven.Services.Implementation;

namespace SeaHavenIndustries.Tests;

public class WorkOrderBoardConcurrencyTests
{
    private static ApplicationDbContext CreateContext(string dbName)
    {
        var options = new DbContextOptionsBuilder<ApplicationDbContext>()
            .UseInMemoryDatabase(dbName)
            .Options;
        return new ApplicationDbContext(options);
    }

    private static WorkOrderBoardUpdateService CreateService(ApplicationDbContext context)
    {
        var boardData = new WorkOrderBoardDataService(context);
        var mutationData = new WorkOrderBoardMutationDataService(context);
        var fieldLocks = new WorkOrderFieldLockService(new WorkOrderFieldLockDataService(context));
        var audit = new WorkOrderAuditService(new WorkOrderAuditDataService(context), fieldLocks);
        return new WorkOrderBoardUpdateService(boardData, mutationData, audit);
    }

    [Fact]
    public async Task ParallelVendorAndStatusEdits_OnDifferentAggregates_Succeed()
    {
        var dbName = Guid.NewGuid().ToString();
        await using var seedContext = CreateContext(dbName);
        seedContext.Vendors.Add(new Vendor { Id = 3, CompanyName = "Parallel Vendor" });
        var dispatch = new Dispatch
        {
            Id = 10,
            VendorId = 3,
            WorkOrderId = 1,
            RowVersion = new byte[] { 9, 0, 0, 0, 0, 0, 0, 9 }
        };
        seedContext.Dispatches.Add(dispatch);
        seedContext.workOrders.Add(new WorkOrder
        {
            Id = 1,
            LifecycleStatus = LifecycleStatus.Incomplete,
            ScheduledDate = new DateTime(2027, 6, 25),
            PrimaryDispatchId = 10,
            RowVersion = new byte[] { 8, 0, 0, 0, 0, 0, 0, 8 }
        });
        await seedContext.SaveChangesAsync();

        await using var woContext = CreateContext(dbName);
        await using var dispatchContext = CreateContext(dbName);
        var woService = CreateService(woContext);
        var dispatchService = CreateService(dispatchContext);

        var wo = await woContext.workOrders.FindAsync(1);
        var disp = await dispatchContext.Dispatches.FindAsync(10);

        var statusTask = woService.PatchFieldAsync(1, new WorkOrderBoardPatchRequestDto
        {
            Field = WorkOrderBoardFieldNames.LifecycleStatus,
            Value = "Scheduled",
            WorkOrderVersion = Convert.ToBase64String(wo!.RowVersion!)
        }, "dispatcher-a");

        var vendorTask = dispatchService.PatchFieldAsync(1, new WorkOrderBoardPatchRequestDto
        {
            Field = WorkOrderBoardFieldNames.VendorId,
            Value = "3",
            WorkOrderVersion = Convert.ToBase64String(wo.RowVersion!),
            DispatchVersion = Convert.ToBase64String(disp!.RowVersion!),
            PrimaryDispatchId = 10
        }, "dispatcher-b");

        await Task.WhenAll(statusTask, vendorTask);

        Assert.Equal(LifecycleStatus.Scheduled, statusTask.Result.LifecycleStatus);
        Assert.Equal(3, vendorTask.Result.VendorId);
    }

    [Fact]
    public async Task StaleWorkOrderVersion_ThrowsConcurrencyWithCurrentState()
    {
        var dbName = Guid.NewGuid().ToString();
        await using var context1 = CreateContext(dbName);
        context1.workOrders.Add(new WorkOrder
        {
            Id = 1,
            SiteCode = "A",
            LifecycleStatus = LifecycleStatus.Scheduled,
            RowVersion = new byte[] { 1, 0, 0, 0, 0, 0, 0, 1 }
        });
        await context1.SaveChangesAsync();

        await using var context2 = CreateContext(dbName);
        var wo2 = await context2.workOrders.FirstAsync();
        wo2.SiteCode = "B";
        await context2.SaveChangesAsync();

        await using var patchContext = CreateContext(dbName);
        var service = CreateService(patchContext);
        var staleVersion = Convert.ToBase64String(new byte[] { 1, 0, 0, 0, 0, 0, 0, 1 });

        var ex = await Assert.ThrowsAsync<WorkOrderBoardConcurrencyException>(() =>
            service.PatchFieldAsync(1, new WorkOrderBoardPatchRequestDto
            {
                Field = WorkOrderBoardFieldNames.SiteCode,
                Value = "C",
                WorkOrderVersion = staleVersion
            }, "actor-1"));

        Assert.NotNull(ex.CurrentState);
        Assert.Equal("B", ex.CurrentState!.SiteCode);
    }

    [Fact]
    public async Task RescheduleAuditCount_MatchesChangedFields()
    {
        var dbName = Guid.NewGuid().ToString();
        await using var context = CreateContext(dbName);
        context.workOrders.Add(new WorkOrder
        {
            Id = 1,
            LifecycleStatus = LifecycleStatus.Scheduled,
            ScheduledDate = new DateTime(2026, 6, 20),
            RescheduleCount = 0,
            RowVersion = new byte[] { 1, 0, 0, 0, 0, 0, 0, 1 }
        });
        await context.SaveChangesAsync();

        var service = CreateService(context);
        var wo = await context.workOrders.FindAsync(1);

        await service.PatchFieldAsync(1, new WorkOrderBoardPatchRequestDto
        {
            Field = WorkOrderBoardFieldNames.ScheduledDate,
            Value = "2026-06-25",
            WorkOrderVersion = Convert.ToBase64String(wo!.RowVersion!)
        }, "actor-1");

        var audits = await context.WorkOrderAuditLogs.ToListAsync();
        Assert.Equal(3, audits.Count);
        Assert.Contains(audits, a => a.FieldName == "IsAddOn");
        Assert.Contains(audits, a => a.FieldName == "ScheduledDate");
        Assert.Contains(audits, a => a.FieldName == "RescheduleCount");
    }

    [Fact]
    public async Task SecondEditWithStaleVersion_FailsAfterFirstEdit()
    {
        var dbName = Guid.NewGuid().ToString();
        await using var seed = CreateContext(dbName);
        seed.workOrders.Add(new WorkOrder
        {
            Id = 1,
            SiteCode = "A",
            LifecycleStatus = LifecycleStatus.Scheduled,
            RowVersion = new byte[] { 4, 0, 0, 0, 0, 0, 0, 4 }
        });
        await seed.SaveChangesAsync();

        var originalVersion = Convert.ToBase64String(new byte[] { 4, 0, 0, 0, 0, 0, 0, 4 });

        await using (var ctx1 = CreateContext(dbName))
        {
            var svc1 = CreateService(ctx1);
            await svc1.PatchFieldAsync(1, new WorkOrderBoardPatchRequestDto
            {
                Field = WorkOrderBoardFieldNames.SiteCode,
                Value = "B",
                WorkOrderVersion = originalVersion
            }, "user-1");
        }

        await using var ctx2 = CreateContext(dbName);
        var svc2 = CreateService(ctx2);
        await Assert.ThrowsAsync<WorkOrderBoardConcurrencyException>(() =>
            svc2.PatchFieldAsync(1, new WorkOrderBoardPatchRequestDto
            {
                Field = WorkOrderBoardFieldNames.SiteCode,
                Value = "C",
                WorkOrderVersion = originalVersion
            }, "user-2"));
    }
}