using SeaHaven.Services.Helpers;

namespace SeaHavenIndustries.Tests;

public class WorkOrderAddonCutoffTests
{
    // Schedule week Mon 2026-06-22 → cutoff Sat 2026-06-20 23:59:59 UTC
    private static readonly DateTime ScheduleMonday = new(2026, 6, 22, 0, 0, 0, DateTimeKind.Utc);
    private static readonly DateTime ExpectedCutoff = new(2026, 6, 20, 23, 59, 59, DateTimeKind.Utc);

    [Fact]
    public void GetAddonCutoffUtc_FromScheduledDate_IsPriorSaturdayEndOfDay()
    {
        // Wednesday in schedule week
        var cutoff = WorkOrderAddonCutoff.GetAddonCutoffUtc(new DateTime(2026, 6, 24, 15, 0, 0, DateTimeKind.Utc));
        Assert.Equal(ExpectedCutoff, cutoff);
    }

    [Fact]
    public void GetAddonCutoffUtc_FromTargetWeekMonday_IsPriorSaturdayEndOfDay()
    {
        var cutoff = WorkOrderAddonCutoff.GetAddonCutoffUtc(new DateOnly(2026, 6, 22));
        Assert.Equal(ExpectedCutoff, cutoff);
    }

    [Fact]
    public void GetAddonCutoffUtc_FromMondayAnchor_MatchesGetWeekStartMondayMinusTwo()
    {
        var monday = WorkOrderBoardMutationRules.GetWeekStartMonday(ScheduleMonday);
        Assert.Equal(ScheduleMonday.Date, monday.Date);
        Assert.Equal(ExpectedCutoff, WorkOrderAddonCutoff.GetAddonCutoffUtc(ScheduleMonday));
    }

    [Fact]
    public void Compute_AfterCutoff_ReturnsTrue_IgnoresManualFalse()
    {
        var created = new DateTime(2026, 6, 21, 0, 0, 0, DateTimeKind.Utc);
        var result = WorkOrderAddonCutoff.ComputeIsAddOnAtCreation(
            created,
            scheduledDate: new DateTime(2026, 6, 24),
            targetWeek: null,
            manualOverride: false);

        Assert.True(result);
    }

    [Fact]
    public void Compute_BeforeCutoff_ReturnsFalse_IgnoresManualTrue()
    {
        var created = new DateTime(2026, 6, 20, 23, 59, 59, DateTimeKind.Utc);
        var result = WorkOrderAddonCutoff.ComputeIsAddOnAtCreation(
            created,
            scheduledDate: new DateTime(2026, 6, 24),
            targetWeek: null,
            manualOverride: true);

        Assert.False(result);
    }

    [Fact]
    public void Compute_ExactlyAtCutoff_ReturnsFalse()
    {
        var result = WorkOrderAddonCutoff.ComputeIsAddOnAtCreation(
            ExpectedCutoff,
            scheduledDate: ScheduleMonday,
            targetWeek: null,
            manualOverride: true);

        Assert.False(result);
    }

    [Fact]
    public void Compute_TargetWeekOnly_UsesCutoff()
    {
        var after = WorkOrderAddonCutoff.ComputeIsAddOnAtCreation(
            new DateTime(2026, 6, 21, 12, 0, 0, DateTimeKind.Utc),
            scheduledDate: null,
            targetWeek: new DateOnly(2026, 6, 22),
            manualOverride: false);

        var before = WorkOrderAddonCutoff.ComputeIsAddOnAtCreation(
            new DateTime(2026, 6, 19, 12, 0, 0, DateTimeKind.Utc),
            scheduledDate: null,
            targetWeek: new DateOnly(2026, 6, 22),
            manualOverride: true);

        Assert.True(after);
        Assert.False(before);
    }

    [Fact]
    public void Compute_NoSchedule_UsesManualOverride()
    {
        Assert.True(WorkOrderAddonCutoff.ComputeIsAddOnAtCreation(
            DateTime.UtcNow, null, null, manualOverride: true));
        Assert.False(WorkOrderAddonCutoff.ComputeIsAddOnAtCreation(
            DateTime.UtcNow, null, null, manualOverride: false));
        Assert.False(WorkOrderAddonCutoff.ComputeIsAddOnAtCreation(
            DateTime.UtcNow, null, null, manualOverride: null));
    }

    [Fact]
    public void Compute_ScheduledDatePreferredOverTargetWeek()
    {
        // Target week far future (cutoff after created) would be false;
        // scheduled date near past (cutoff before created) → true.
        var created = new DateTime(2026, 7, 1, 0, 0, 0, DateTimeKind.Utc);
        var result = WorkOrderAddonCutoff.ComputeIsAddOnAtCreation(
            created,
            scheduledDate: new DateTime(2026, 6, 24),
            targetWeek: new DateOnly(2099, 1, 5),
            manualOverride: false);

        Assert.True(result);
    }

    // Rescheduled on Wed 2026-06-24: the week of 06-22 is past its cutoff (Sat 06-20 23:59:59),
    // the week of 06-29 is not (cutoff Sat 06-27 23:59:59).
    private static readonly DateTime RescheduledAt = new(2026, 6, 24, 10, 0, 0, DateTimeKind.Utc);

    [Fact]
    public void RecalculateOnReschedule_NoSchedule_ReturnsFalse()
    {
        Assert.False(WorkOrderAddonCutoff.RecalculateIsAddOnOnReschedule(
            currentIsAddOn: true,
            previousScheduledDate: new DateTime(2026, 6, 24),
            previousTargetWeek: null,
            scheduledDate: null,
            targetWeek: null,
            RescheduledAt));
    }

    [Fact]
    public void RecalculateOnReschedule_IntoWeekPastCutoff_TurnsOnForWorkOrderCreatedLongBefore()
    {
        // SH-412: the WO was created weeks earlier; it arrives in the current week at the
        // moment of the reschedule, which is already past that week's cutoff.
        var result = WorkOrderAddonCutoff.RecalculateIsAddOnOnReschedule(
            currentIsAddOn: false,
            previousScheduledDate: new DateTime(2026, 7, 8),
            previousTargetWeek: null,
            scheduledDate: new DateTime(2026, 6, 25),
            targetWeek: null,
            RescheduledAt);

        Assert.True(result);
    }

    [Fact]
    public void RecalculateOnReschedule_IntoWeekBeforeCutoff_TurnsOff()
    {
        var result = WorkOrderAddonCutoff.RecalculateIsAddOnOnReschedule(
            currentIsAddOn: true,
            previousScheduledDate: new DateTime(2026, 6, 24),
            previousTargetWeek: null,
            scheduledDate: new DateTime(2026, 7, 1),
            targetWeek: null,
            RescheduledAt);

        Assert.False(result);
    }

    [Theory]
    [InlineData(true)]
    [InlineData(false)]
    public void RecalculateOnReschedule_WithinSameWeek_KeepsCurrentValue(bool currentIsAddOn)
    {
        var result = WorkOrderAddonCutoff.RecalculateIsAddOnOnReschedule(
            currentIsAddOn,
            previousScheduledDate: new DateTime(2026, 6, 22),
            previousTargetWeek: null,
            scheduledDate: new DateTime(2026, 6, 26),
            targetWeek: null,
            RescheduledAt);

        Assert.Equal(currentIsAddOn, result);
    }

    [Fact]
    public void RecalculateOnReschedule_FirstScheduleIntoWeekPastCutoff_TurnsOn()
    {
        var result = WorkOrderAddonCutoff.RecalculateIsAddOnOnReschedule(
            currentIsAddOn: false,
            previousScheduledDate: null,
            previousTargetWeek: null,
            scheduledDate: new DateTime(2026, 6, 26),
            targetWeek: null,
            RescheduledAt);

        Assert.True(result);
    }
}