using System.Security.Claims;
using Api.SeaHavenIndustries.Controllers;
using Api.SeaHavenIndustries.DTOs;
using Data.SeaHavenIndustries;
using Data.SeaHavenIndustries.Enums;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Logging.Abstractions;
using SeaHaven.DataServices.Implementation;
using SeaHaven.DataServices.Models;
using SeaHaven.Services.Implementation;
using SeaHaven.Services.Validation;

namespace SeaHavenIndustries.Tests;

public sealed class WorkOrderEditAddonRescheduleTests
{
    [Fact]
    public async Task EditWorkorder_RescheduleIntoEarlierWeek_EnablesAndAuditsAddOn()
    {
        await using var context = CreateContext();
        context.workOrders.Add(new WorkOrder
        {
            Id = 1,
            CreatedDate = new DateTime(2026, 6, 21, 0, 0, 0, DateTimeKind.Utc),
            ScheduledDate = new DateTime(2026, 6, 29),
            IsAddOn = false
        });
        await context.SaveChangesAsync();

        var result = await CreateController(context).Editworkorder(new EditWorkorder_DTO
        {
            Id = 1,
            ScheduledDate = new DateTime(2026, 6, 25)
        });

        Assert.IsType<OkObjectResult>(result);
        var persisted = await context.workOrders.SingleAsync(x => x.Id == 1);
        Assert.Equal(new DateTime(2026, 6, 25), persisted.ScheduledDate);
        Assert.True(persisted.IsAddOn);
        Assert.Equal(1, persisted.RescheduleCount);
        var audit = await context.WorkOrderAuditLogs
            .Where(x => x.WorkOrderId == 1)
            .ToListAsync();
        Assert.Single(audit);
        Assert.Contains(audit, x => x.FieldName?.Contains("Schedule On", StringComparison.Ordinal) == true);
        Assert.Contains(audit, x => x.FieldName?.Contains("IsAddOn", StringComparison.Ordinal) == true);
        Assert.Contains(audit, x => x.FieldName?.Contains("RescheduleCount: 0 → 1", StringComparison.Ordinal) == true);
    }

    [Fact]
    public async Task EditWorkorder_RescheduleOlderWorkOrderIntoWeekPastCutoff_EnablesAndAuditsAddOn()
    {
        // SH-412 retest: the WO was created weeks before the target week's cutoff, so the
        // creation-time rule kept Add-On off. It arrives in the week when it is rescheduled.
        await using var context = CreateContext();
        context.workOrders.Add(new WorkOrder
        {
            Id = 1,
            CreatedDate = new DateTime(2026, 6, 1, 0, 0, 0, DateTimeKind.Utc),
            ScheduledDate = new DateTime(2026, 7, 8),
            IsAddOn = false
        });
        await context.SaveChangesAsync();

        var result = await CreateController(context, new FixedTimeProvider()).Editworkorder(new EditWorkorder_DTO
        {
            Id = 1,
            ScheduledDate = new DateTime(2026, 6, 25)
        });

        Assert.IsType<OkObjectResult>(result);
        var persisted = await context.workOrders.SingleAsync(x => x.Id == 1);
        Assert.True(persisted.IsAddOn);
        var audit = await context.WorkOrderAuditLogs.SingleAsync(x => x.WorkOrderId == 1);
        Assert.Contains("IsAddOn: False → True", audit.FieldName);
    }

    [Fact]
    public async Task EditWorkorder_RescheduleIntoWeekBeforeCutoff_ClearsAndAuditsAddOn()
    {
        await using var context = CreateContext();
        context.workOrders.Add(new WorkOrder
        {
            Id = 1,
            CreatedDate = new DateTime(2026, 6, 23, 0, 0, 0, DateTimeKind.Utc),
            ScheduledDate = new DateTime(2026, 6, 24),
            IsAddOn = true
        });
        await context.SaveChangesAsync();

        var result = await CreateController(context, new FixedTimeProvider()).Editworkorder(new EditWorkorder_DTO
        {
            Id = 1,
            ScheduledDate = new DateTime(2026, 7, 1)
        });

        Assert.IsType<OkObjectResult>(result);
        var persisted = await context.workOrders.SingleAsync(x => x.Id == 1);
        Assert.False(persisted.IsAddOn);
        var audit = await context.WorkOrderAuditLogs.SingleAsync(x => x.WorkOrderId == 1);
        Assert.Contains("IsAddOn: True → False", audit.FieldName);
    }

    [Fact]
    public async Task EditWorkorder_RescheduleWithinSameWeek_KeepsAddOn()
    {
        await using var context = CreateContext();
        context.workOrders.Add(new WorkOrder
        {
            Id = 1,
            CreatedDate = new DateTime(2026, 6, 1, 0, 0, 0, DateTimeKind.Utc),
            ScheduledDate = new DateTime(2026, 7, 6),
            IsAddOn = false
        });
        await context.SaveChangesAsync();

        var result = await CreateController(context, new FixedTimeProvider()).Editworkorder(new EditWorkorder_DTO
        {
            Id = 1,
            ScheduledDate = new DateTime(2026, 7, 9)
        });

        Assert.IsType<OkObjectResult>(result);
        var persisted = await context.workOrders.SingleAsync(x => x.Id == 1);
        Assert.False(persisted.IsAddOn);
        var audit = await context.WorkOrderAuditLogs.SingleAsync(x => x.WorkOrderId == 1);
        Assert.DoesNotContain("IsAddOn", audit.FieldName);
    }

    [Fact]
    public async Task EditWorkorder_WithoutScheduledDate_LeavesScheduleAndAddOnUntouched()
    {
        // The edit form sends only changed fields: a null Schedule On means "not sent", never
        // "clear". Clearing happens through the board patch, which turns Add-On off.
        await using var context = CreateContext();
        context.workOrders.Add(new WorkOrder
        {
            Id = 1,
            CreatedDate = new DateTime(2026, 6, 23, 0, 0, 0, DateTimeKind.Utc),
            ScheduledDate = new DateTime(2026, 6, 24),
            IsAddOn = true
        });
        await context.SaveChangesAsync();

        var result = await CreateController(context, new FixedTimeProvider()).Editworkorder(new EditWorkorder_DTO
        {
            Id = 1,
            DueDate = new DateTime(2026, 6, 30)
        });

        Assert.IsType<OkObjectResult>(result);
        var persisted = await context.workOrders.SingleAsync(x => x.Id == 1);
        Assert.Equal(new DateTime(2026, 6, 24), persisted.ScheduledDate);
        Assert.True(persisted.IsAddOn);
        Assert.DoesNotContain(
            await context.WorkOrderAuditLogs.Where(x => x.WorkOrderId == 1).ToListAsync(),
            x => x.FieldName?.Contains("IsAddOn", StringComparison.Ordinal) == true);
    }

    [Fact]
    public async Task EditWorkorder_FirstSchedule_SetsOriginalWeekAndPromotesIncomplete()
    {
        await using var context = CreateContext();
        context.workOrders.Add(new WorkOrder
        {
            Id = 1,
            CreatedDate = new DateTime(2026, 6, 21, 0, 0, 0, DateTimeKind.Utc),
            LifecycleStatus = LifecycleStatus.Incomplete
        });
        await context.SaveChangesAsync();

        var result = await CreateController(context).Editworkorder(new EditWorkorder_DTO
        {
            Id = 1,
            ScheduledDate = new DateTime(2026, 7, 1)
        });

        Assert.IsType<OkObjectResult>(result);
        var persisted = await context.workOrders.SingleAsync(x => x.Id == 1);
        Assert.Equal(new DateOnly(2026, 7, 1), persisted.OriginalDate);
        Assert.Equal(new DateOnly(2026, 6, 29), persisted.OriginalWeek);
        Assert.Equal(0, persisted.RescheduleCount);
        Assert.Equal(LifecycleStatus.Scheduled, persisted.LifecycleStatus);
    }

    [Fact]
    public async Task EditWorkorder_Reschedule_WaitsForWorkOrderMutationGateAndReadsCommittedSchedule()
    {
        const int workOrderId = 41201;
        var databaseName = Guid.NewGuid().ToString();
        await using (var seed = CreateContext(databaseName))
        {
            seed.workOrders.Add(new WorkOrder
            {
                Id = workOrderId,
                CreatedDate = new DateTime(2026, 6, 21, 0, 0, 0, DateTimeKind.Utc),
                ScheduledDate = new DateTime(2026, 7, 6),
                OriginalDate = new DateOnly(2026, 7, 6),
                IsAddOn = false
            });
            await seed.SaveChangesAsync();
        }

        // A concurrent reschedule holds the work order's mutation gate and commits its own
        // date while the edit is waiting.
        await using var holderContext = CreateContext(databaseName);
        var held = new TaskCompletionSource(TaskCreationOptions.RunContinuationsAsynchronously);
        var release = new TaskCompletionSource(TaskCreationOptions.RunContinuationsAsynchronously);
        var holder = new UpliftDataService(holderContext).ExecuteWorkOrderMutationAsync(
            workOrderId,
            async ct =>
            {
                held.SetResult();
                await release.Task;
                var workOrder = await holderContext.workOrders.SingleAsync(x => x.Id == workOrderId, ct);
                workOrder.ScheduledDate = new DateTime(2026, 6, 29);
                workOrder.RescheduleCount++;
                await holderContext.SaveChangesAsync(ct);
                return true;
            },
            CancellationToken.None);
        await held.Task;

        await using var editContext = CreateContext(databaseName);
        var edit = CreateController(editContext).Editworkorder(new EditWorkorder_DTO
        {
            Id = workOrderId,
            ScheduledDate = new DateTime(2026, 6, 25)
        });
        await Task.Delay(200);

        Assert.False(edit.IsCompleted);

        release.SetResult();
        await holder;
        Assert.IsType<OkObjectResult>(await edit);

        await using var verify = CreateContext(databaseName);
        var persisted = await verify.workOrders.SingleAsync(x => x.Id == workOrderId);
        Assert.Equal(new DateTime(2026, 6, 25), persisted.ScheduledDate);
        Assert.Equal(2, persisted.RescheduleCount);
        Assert.True(persisted.IsAddOn);
        var audit = await verify.WorkOrderAuditLogs.SingleAsync(x => x.WorkOrderId == workOrderId);
        Assert.Contains("Schedule On: 2026-06-29 → 2026-06-25", audit.FieldName);
        Assert.Contains("RescheduleCount: 1 → 2", audit.FieldName);
    }

    private static ApplicationDbContext CreateContext(string? databaseName = null)
    {
        var options = new DbContextOptionsBuilder<ApplicationDbContext>()
            .UseInMemoryDatabase(databaseName ?? Guid.NewGuid().ToString())
            .Options;
        return new ApplicationDbContext(options);
    }

    // Wed 2026-06-24: the week of 06-22 is past its cutoff, the week of 06-29 is not.
    private sealed class FixedTimeProvider : TimeProvider
    {
        public override DateTimeOffset GetUtcNow() => new(2026, 6, 24, 10, 0, 0, TimeSpan.Zero);
    }

    private static WorkOrderController CreateController(
        ApplicationDbContext context,
        TimeProvider? timeProvider = null)
    {
        var accountResolver = WorkOrderAccountTestHelpers.Resolver(context);
        var workOrderService = new WorkOrderService(
            new WorkOrderDataService(context),
            new CommentDataService(context),
            new UserDataService(context),
            new QuotesDataService(context),
            fileStorage: null!,
            new CreateWorkOrderValidation(),
            new UpdateWorkOrderValidation(),
            accountResolver,
            timeProvider);
        return new WorkOrderController(
            workOrderService,
            accountResolver,
            NullLogger<WorkOrderController>.Instance)
        {
            ControllerContext = new ControllerContext
            {
                HttpContext = new DefaultHttpContext
                {
                    User = new ClaimsPrincipal(new ClaimsIdentity(
                        new[] { new Claim(ClaimTypes.NameIdentifier, "dispatcher-1") },
                        authenticationType: "test"))
                }
            }
        };
    }
}