using Data.SeaHavenIndustries;
using Data.SeaHavenIndustries.Enums;
using Microsoft.EntityFrameworkCore;
using Microsoft.EntityFrameworkCore.Diagnostics;
using Microsoft.Extensions.Logging.Abstractions;
using SeaHaven.DataServices.Implementation;
using SeaHaven.Services.Helpers;
using SeaHaven.Services.Implementation;
using SeaHaven.Services.Interfaces;

namespace SeaHavenIndustries.Tests;

public class WorkOrderWeekRolledTests
{
    private static readonly DateOnly SourceWeekStart = new(2026, 6, 16);
    private static readonly DateOnly SourceWeekEnd = new(2026, 6, 20);

    private static ApplicationDbContext CreateContext()
    {
        var options = new DbContextOptionsBuilder<ApplicationDbContext>()
            .UseInMemoryDatabase(Guid.NewGuid().ToString())
            .ConfigureWarnings(w => w.Ignore(InMemoryEventId.TransactionIgnoredWarning))
            .Options;
        return new ApplicationDbContext(options);
    }

    private static WorkOrderWeekRolledService CreateService(ApplicationDbContext context)
    {
        var dataService = new WorkOrderDomainJobDataService(context);
        var audit = new WorkOrderAuditService(new WorkOrderAuditDataService(context), new WorkOrderFieldLockService(new WorkOrderFieldLockDataService(context)));
        return new WorkOrderWeekRolledService(
            dataService,
            audit,
            NullLogger<WorkOrderWeekRolledService>.Instance);
    }

    [Fact]
    public async Task WeekRolled_IncrementsCarriedOver_ForEligibleWo()
    {
        await using var context = CreateContext();
        context.workOrders.Add(new WorkOrder
        {
            Id = 1,
            ScheduledDate = new DateTime(2026, 6, 18),
            LifecycleStatus = LifecycleStatus.Scheduled,
            CarriedOver = 0
        });
        await context.SaveChangesAsync();

        var service = CreateService(context);
        var result = await service.ProcessWeekRolledAsync(SourceWeekStart);

        Assert.Equal(1, result.Processed);
        Assert.Equal(0, result.Skipped);
        Assert.Equal(0, result.Failed);

        var wo = await context.workOrders.FindAsync(1);
        Assert.Equal(1, wo!.CarriedOver);
    }

    [Fact]
    public async Task WeekRolled_SkipsTerminalStatuses()
    {
        await using var context = CreateContext();
        context.workOrders.AddRange(
            new WorkOrder
            {
                Id = 1,
                ScheduledDate = new DateTime(2026, 6, 18),
                LifecycleStatus = LifecycleStatus.Completed
            },
            new WorkOrder
            {
                Id = 2,
                ScheduledDate = new DateTime(2026, 6, 18),
                LifecycleStatus = LifecycleStatus.Canceled
            });
        await context.SaveChangesAsync();

        var service = CreateService(context);
        var result = await service.ProcessWeekRolledAsync(SourceWeekStart);

        Assert.Equal(0, result.Processed);
        Assert.Equal(0, result.Failed);
    }

    [Fact]
    public async Task WeekRolled_Idempotent_SecondRunSkips()
    {
        await using var context = CreateContext();
        context.workOrders.Add(new WorkOrder
        {
            Id = 1,
            ScheduledDate = new DateTime(2026, 6, 18),
            LifecycleStatus = LifecycleStatus.Scheduled,
            CarriedOver = 0
        });
        await context.SaveChangesAsync();

        var service = CreateService(context);
        var first = await service.ProcessWeekRolledAsync(SourceWeekStart);
        var second = await service.ProcessWeekRolledAsync(SourceWeekStart);

        Assert.Equal(1, first.Processed);
        Assert.Equal(0, second.Processed);
        Assert.Equal(0, second.Failed);

        var wo = await context.workOrders.FindAsync(1);
        Assert.Equal(1, wo!.CarriedOver);
    }

    [Fact]
    public async Task WeekRolled_WritesAuditEvent()
    {
        await using var context = CreateContext();
        context.workOrders.Add(new WorkOrder
        {
            Id = 1,
            ScheduledDate = new DateTime(2026, 6, 18),
            LifecycleStatus = LifecycleStatus.InProgress,
            CarriedOver = 2
        });
        await context.SaveChangesAsync();

        var service = CreateService(context);
        await service.ProcessWeekRolledAsync(SourceWeekStart);

        var logs = await context.WorkOrderAuditLogs.ToListAsync();
        Assert.Single(logs);
        Assert.Equal("WeekRolled", logs[0].Action);
        Assert.Equal("System", logs[0].EventType);
        Assert.Equal("System", logs[0].ActorType);
        Assert.Equal("CarriedOver", logs[0].FieldName);
        Assert.Equal("2", logs[0].OldValue);
        Assert.Equal("3", logs[0].NewValue);
        Assert.Equal("week:2026-06-16", logs[0].CorrelationId);

        var locks = await context.WorkOrderFieldLocks.ToListAsync();
        Assert.Empty(locks);
    }

    [Fact]
    public async Task WeekRolled_ConcurrentWithReschedule_DoesNotDuplicate()
    {
        await using var context = CreateContext();
        context.workOrders.Add(new WorkOrder
        {
            Id = 1,
            ScheduledDate = new DateTime(2026, 6, 18),
            LifecycleStatus = LifecycleStatus.Scheduled,
            CarriedOver = 0
        });
        await context.SaveChangesAsync();

        var dataService = new WorkOrderDomainJobDataService(context);
        var correlationId = WorkOrderOperationalWeek.BuildWeekCorrelationId(SourceWeekStart);

        var first = await dataService.TryProcessWeekRolledAsync(1, SourceWeekStart, correlationId);
        var second = await dataService.TryProcessWeekRolledAsync(1, SourceWeekStart, correlationId);

        Assert.True(first.Processed);
        Assert.True(second.Skipped);

        var wo = await context.workOrders.FindAsync(1);
        Assert.Equal(1, wo!.CarriedOver);
    }

    [Fact]
    public async Task WeekRolled_FailureReRun_IsSafeAfterPartialLedger()
    {
        await using var context = CreateContext();
        context.workOrders.Add(new WorkOrder
        {
            Id = 1,
            ScheduledDate = new DateTime(2026, 6, 18),
            LifecycleStatus = LifecycleStatus.Scheduled,
            CarriedOver = 0
        });
        await context.SaveChangesAsync();

        var dataService = new WorkOrderDomainJobDataService(context);
        var correlationId = WorkOrderOperationalWeek.BuildWeekCorrelationId(SourceWeekStart);

        await dataService.TryProcessWeekRolledAsync(1, SourceWeekStart, correlationId);

        var service = CreateService(context);
        var rerun = await service.ProcessWeekRolledAsync(SourceWeekStart);

        Assert.Equal(0, rerun.Processed);
        Assert.Equal(0, rerun.Failed);

        var wo = await context.workOrders.FindAsync(1);
        Assert.Equal(1, wo!.CarriedOver);
    }

    [Fact]
    public async Task WeekRolled_ProcessesAllEligible_WhenMoreThanBatchSize()
    {
        // WorkOrderWeekRolledService.BatchSize is 500; more than one page must all be carried over.
        const int eligibleCount = 501;

        await using var context = CreateContext();
        for (var i = 1; i <= eligibleCount; i++)
        {
            context.workOrders.Add(new WorkOrder
            {
                Id = i,
                ScheduledDate = new DateTime(2026, 6, 18),
                LifecycleStatus = LifecycleStatus.Scheduled,
                CarriedOver = 0
            });
        }
        await context.SaveChangesAsync();

        var service = CreateService(context);
        var result = await service.ProcessWeekRolledAsync(SourceWeekStart);

        Assert.Equal(eligibleCount, result.Processed);
        Assert.Equal(0, result.Skipped);
        Assert.Equal(0, result.Failed);

        var carriedOverCount = await context.workOrders.CountAsync(w => w.CarriedOver == 1);
        Assert.Equal(eligibleCount, carriedOverCount);

        var ledgerCount = await context.WorkOrderWeekRolledLedgers.CountAsync();
        Assert.Equal(eligibleCount, ledgerCount);

        var auditCount = await context.WorkOrderAuditLogs.CountAsync(l => l.Action == "WeekRolled");
        Assert.Equal(eligibleCount, auditCount);
    }

    [Fact]
    public async Task PastDueCache_SyncsOperationalFlags()
    {
        await using var context = CreateContext();
        var pastDate = DateTime.UtcNow.Date.AddDays(-3);
        var futureDate = DateTime.UtcNow.Date.AddDays(3);

        context.workOrders.AddRange(
            new WorkOrder
            {
                Id = 1,
                DueDate = pastDate,
                ScheduledDate = pastDate,
                LifecycleStatus = LifecycleStatus.Scheduled
            },
            new WorkOrder
            {
                Id = 2,
                DueDate = pastDate,
                ScheduledDate = pastDate,
                LifecycleStatus = LifecycleStatus.Completed,
                OperationalFlags = OperationalFlags.PastDue
            },
            new WorkOrder
            {
                Id = 3,
                DueDate = futureDate,
                ScheduledDate = futureDate,
                LifecycleStatus = LifecycleStatus.Scheduled,
                OperationalFlags = OperationalFlags.PastDue
            });
        await context.SaveChangesAsync();

        var dataService = new WorkOrderDomainJobDataService(context);
        var result = await dataService.RefreshPastDueFlagsAsync(DateTime.UtcNow);

        Assert.Equal(1, result.SetCount);
        Assert.Equal(2, result.ClearedCount);

        var wo1 = await context.workOrders.FindAsync(1);
        var wo2 = await context.workOrders.FindAsync(2);
        var wo3 = await context.workOrders.FindAsync(3);

        Assert.True(wo1!.OperationalFlags.HasFlag(OperationalFlags.PastDue));
        Assert.False(wo2!.OperationalFlags.HasFlag(OperationalFlags.PastDue));
        Assert.False(wo3!.OperationalFlags.HasFlag(OperationalFlags.PastDue));
    }

    [Fact]
    public async Task Board_ReflectsCarriedOver_AfterWeekRolled()
    {
        await using var context = CreateContext();
        context.workOrders.Add(new WorkOrder
        {
            Id = 1,
            ScheduledDate = new DateTime(2026, 6, 18),
            LifecycleStatus = LifecycleStatus.Scheduled,
            CarriedOver = 0
        });
        await context.SaveChangesAsync();

        var service = CreateService(context);
        await service.ProcessWeekRolledAsync(SourceWeekStart);

        var boardData = new WorkOrderBoardDataService(context);
        var boardService = new WorkOrderBoardService(boardData, WorkOrderAccountTestHelpers.Resolver(context));
        var row = await boardService.GetBoardRowAsync(1, WorkOrderAccountTestHelpers.OrgWideAdmin());

        Assert.NotNull(row);
        Assert.Equal(1, row!.CarriedOver);
    }

    [Fact]
    public async Task Board_IsPastDue_UnaffectedByCache()
    {
        await using var context = CreateContext();
        var pastDate = DateTime.UtcNow.Date.AddDays(-2);

        context.workOrders.Add(new WorkOrder
        {
            Id = 1,
            DueDate = DateTime.UtcNow.Date.AddDays(5),
            ScheduledDate = pastDate,
            LifecycleStatus = LifecycleStatus.Scheduled,
            OperationalFlags = OperationalFlags.None
        });
        await context.SaveChangesAsync();

        var boardData = new WorkOrderBoardDataService(context);
        var boardService = new WorkOrderBoardService(boardData, WorkOrderAccountTestHelpers.Resolver(context));
        var row = await boardService.GetBoardRowAsync(1, WorkOrderAccountTestHelpers.OrgWideAdmin());

        Assert.NotNull(row);
        Assert.True(row!.IsPastDue);
        Assert.True(WorkOrderDerivedFields.IsPastDue(pastDate, LifecycleStatus.Scheduled));
    }

    [Fact]
    public async Task Board_IsPastDue_IgnoresStalePastDueFlag()
    {
        await using var context = CreateContext();
        var futureDate = DateTime.UtcNow.Date.AddDays(5);

        context.workOrders.Add(new WorkOrder
        {
            Id = 1,
            DueDate = DateTime.UtcNow.Date.AddDays(-3),
            ScheduledDate = futureDate,
            LifecycleStatus = LifecycleStatus.Scheduled,
            OperationalFlags = OperationalFlags.PastDue
        });
        await context.SaveChangesAsync();

        var boardData = new WorkOrderBoardDataService(context);
        var boardService = new WorkOrderBoardService(boardData, WorkOrderAccountTestHelpers.Resolver(context));
        var row = await boardService.GetBoardRowAsync(1, WorkOrderAccountTestHelpers.OrgWideAdmin());

        Assert.NotNull(row);
        Assert.False(row!.IsPastDue);
    }
}