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

namespace SeaHavenIndustries.Tests;

/// <summary>
/// SH-391: an Advanced Filters date range narrows GET /board/search to rows
/// whose Schedule On (or week-only Target Week) is in the range. Rows with no
/// date come back only when the caller asks for them (no range selected).
/// </summary>
public class WorkOrderAdvancedSearchDateRangeTests
{
    private static readonly DateOnly RangeFrom = new(2026, 9, 21);
    private static readonly DateOnly RangeTo = new(2026, 9, 25);

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

    private static WorkOrderAdvancedSearchService CreateService(ApplicationDbContext context)
        => new(new WorkOrderAdvancedSearchDataService(context), WorkOrderAccountTestHelpers.Resolver(context));

    private static WorkOrder Wo(
        int id,
        DateTime? scheduled,
        string? assignTo = null,
        LifecycleStatus status = LifecycleStatus.Scheduled,
        DateOnly? targetWeek = null,
        int? accountId = null)
        => new()
        {
            Id = id,
            InternalWONumber = $"1000000000{id}",
            AssignTo = assignTo,
            ScheduledDate = scheduled,
            ScheduleWeekOnly = targetWeek.HasValue,
            TargetWeek = targetWeek,
            LifecycleStatus = status,
            AccountId = accountId,
            istemplate = false
        };

    private static WorkOrder NotWeekOnly(WorkOrder wo)
    {
        wo.ScheduleWeekOnly = false;
        return wo;
    }

    private static WorkOrderAdvancedSearchQueryDto UnassignedInRange(bool? includeDateless = null) => new()
    {
        DatePreset = WorkOrderAdvancedSearchDatePreset.Custom,
        DateFrom = RangeFrom,
        DateTo = RangeTo,
        Dispatchers = new List<string> { "__unassigned__" },
        IncludeDateless = includeDateless,
        PageSize = 50
    };

    [Fact]
    public async Task SearchAsync_UnassignedWithRange_ReturnsOnlyUnassignedRowsScheduledInRange()
    {
        await using var context = CreateContext();
        context.workOrders.AddRange(
            Wo(1, new DateTime(2026, 9, 23)),
            Wo(2, new DateTime(2026, 8, 4)),
            Wo(3, null, status: LifecycleStatus.Incomplete),
            Wo(4, new DateTime(2026, 9, 24), assignTo: "user-a"),
            Wo(5, new DateTime(2026, 10, 2)));
        await context.SaveChangesAsync();

        var result = await CreateService(context).SearchAsync(
            UnassignedInRange(), WorkOrderAccountTestHelpers.OrgWideAdmin(), null);

        Assert.Equal(1, result.TotalCount);
        Assert.Equal(new[] { 1 }, result.Items.Select(i => i.Id).ToArray());
    }

    [Fact]
    public async Task SearchAsync_RangeWithoutDispatcherFilter_ExcludesUndatedRows()
    {
        await using var context = CreateContext();
        context.workOrders.AddRange(
            Wo(1, new DateTime(2026, 9, 22), assignTo: "user-a"),
            Wo(2, null, assignTo: "user-a", status: LifecycleStatus.Incomplete),
            Wo(3, new DateTime(2026, 9, 14), assignTo: "user-a", status: LifecycleStatus.Incomplete));
        await context.SaveChangesAsync();

        var result = await CreateService(context).SearchAsync(new WorkOrderAdvancedSearchQueryDto
        {
            DatePreset = WorkOrderAdvancedSearchDatePreset.Custom,
            DateFrom = RangeFrom,
            DateTo = RangeTo
        }, WorkOrderAccountTestHelpers.OrgWideAdmin(), null);

        Assert.Equal(new[] { 1 }, result.Items.Select(i => i.Id).ToArray());
    }

    [Fact]
    public async Task SearchAsync_WeekOnlyRow_MatchesRangeThatOverlapsItsTargetWeek()
    {
        await using var context = CreateContext();
        context.workOrders.AddRange(
            Wo(1, null, targetWeek: new DateOnly(2026, 9, 21)),
            Wo(2, null, targetWeek: new DateOnly(2026, 9, 14)),
            Wo(3, null, targetWeek: new DateOnly(2026, 9, 28)),
            // Week-only with a leftover date outside the range: the week decides,
            // as on the board page (SH-391).
            Wo(4, new DateTime(2026, 10, 2), targetWeek: new DateOnly(2026, 9, 21)),
            // Not week-only: its date decides, so a target week does not bring it in.
            NotWeekOnly(Wo(5, new DateTime(2026, 10, 2), targetWeek: new DateOnly(2026, 9, 21))));
        await context.SaveChangesAsync();

        // Wed–Fri of the week of 9/21: the week-only row for that week overlaps it.
        var result = await CreateService(context).SearchAsync(new WorkOrderAdvancedSearchQueryDto
        {
            DatePreset = WorkOrderAdvancedSearchDatePreset.Custom,
            DateFrom = new DateOnly(2026, 9, 23),
            DateTo = RangeTo,
            Dispatchers = new List<string> { "__unassigned__" }
        }, WorkOrderAccountTestHelpers.OrgWideAdmin(), null);

        Assert.Equal(new[] { 1, 4 }, result.Items.Select(i => i.Id).OrderBy(id => id).ToArray());
    }

    [Fact]
    public async Task SearchAsync_IncludeDateless_AddsOpenUndatedRowsToTheRange()
    {
        await using var context = CreateContext();
        context.workOrders.AddRange(
            Wo(1, new DateTime(2026, 9, 23)),
            Wo(2, new DateTime(2026, 8, 4)),
            Wo(3, null, status: LifecycleStatus.Incomplete),
            Wo(4, null, status: LifecycleStatus.Completed),
            Wo(5, null, status: LifecycleStatus.Canceled));
        await context.SaveChangesAsync();

        var result = await CreateService(context).SearchAsync(
            UnassignedInRange(includeDateless: true), WorkOrderAccountTestHelpers.OrgWideAdmin(), null);

        Assert.Equal(new[] { 1, 3 }, result.Items.Select(i => i.Id).OrderBy(id => id).ToArray());
    }

    // Payloads the frontend sent before includeDateless existed. They must keep
    // their undated rows so this backend can deploy ahead of the client.
    [Theory]
    [InlineData(2000)] // no range selected: ADVANCED_SEARCH_ALL_WEEKS_FROM
    [InlineData(1970)] // pinned Unassigned queue: UNASSIGNED_QUEUE_DATE_FROM
    public async Task SearchAsync_AllWeeksWindowWithoutFlag_KeepsOpenUndatedRows(int fromYear)
    {
        await using var context = CreateContext();
        context.workOrders.AddRange(
            Wo(1, new DateTime(2026, 8, 4)),
            Wo(2, null, status: LifecycleStatus.Incomplete),
            Wo(3, null, status: LifecycleStatus.Completed));
        await context.SaveChangesAsync();

        var result = await CreateService(context).SearchAsync(new WorkOrderAdvancedSearchQueryDto
        {
            DatePreset = WorkOrderAdvancedSearchDatePreset.Custom,
            DateFrom = new DateOnly(fromYear, 1, 1),
            DateTo = new DateOnly(2099, 12, 31),
            Dispatchers = new List<string> { "__unassigned__" },
            PageSize = 50
        }, WorkOrderAccountTestHelpers.OrgWideAdmin(), null);

        Assert.Equal(new[] { 1, 2 }, result.Items.Select(i => i.Id).OrderBy(id => id).ToArray());
    }

    [Fact]
    public async Task SearchAsync_NoDateInputWithoutFlag_KeepsOpenUndatedRows()
    {
        // The WO# duplicate lookup sends only the search text and paging.
        await using var context = CreateContext();
        var thisWeek = WorkOrderSearchDateRangeResolver.GetIsoWeekStart(DateOnly.FromDateTime(DateTime.UtcNow));
        context.workOrders.AddRange(
            Wo(1, thisWeek.ToDateTime(TimeOnly.MinValue)),
            Wo(2, null, status: LifecycleStatus.Incomplete),
            Wo(3, thisWeek.AddDays(-7).ToDateTime(TimeOnly.MinValue)));
        await context.SaveChangesAsync();

        var result = await CreateService(context).SearchAsync(
            new WorkOrderAdvancedSearchQueryDto { PageSize = 100 },
            WorkOrderAccountTestHelpers.OrgWideAdmin(),
            null);

        Assert.Equal(new[] { 1, 2 }, result.Items.Select(i => i.Id).OrderBy(id => id).ToArray());
    }

    [Fact]
    public async Task SearchAsync_AllWeeksWindowWithFlagFalse_ExcludesUndatedRows()
    {
        await using var context = CreateContext();
        context.workOrders.AddRange(
            Wo(1, new DateTime(2026, 8, 4)),
            Wo(2, null, status: LifecycleStatus.Incomplete));
        await context.SaveChangesAsync();

        var result = await CreateService(context).SearchAsync(new WorkOrderAdvancedSearchQueryDto
        {
            DatePreset = WorkOrderAdvancedSearchDatePreset.Custom,
            DateFrom = new DateOnly(2000, 1, 1),
            DateTo = new DateOnly(2099, 12, 31),
            IncludeDateless = false,
            PageSize = 50
        }, WorkOrderAccountTestHelpers.OrgWideAdmin(), null);

        Assert.Equal(new[] { 1 }, result.Items.Select(i => i.Id).ToArray());
    }

    [Theory]
    [InlineData(null, null, null, null, true)]
    [InlineData(null, WorkOrderAdvancedSearchDatePreset.Custom, "2000-01-01", "2099-12-31", true)]
    [InlineData(null, WorkOrderAdvancedSearchDatePreset.Custom, "1970-01-01", "2099-12-31", true)]
    [InlineData(null, WorkOrderAdvancedSearchDatePreset.Custom, "2000-01-02", "2099-12-31", false)]
    [InlineData(null, WorkOrderAdvancedSearchDatePreset.Custom, "2026-09-21", "2026-09-25", false)]
    [InlineData(null, WorkOrderAdvancedSearchDatePreset.ThisWeek, null, null, false)]
    [InlineData(false, null, null, null, false)]
    [InlineData(true, WorkOrderAdvancedSearchDatePreset.ThisWeek, null, null, true)]
    public void ResolveIncludeDateless_InfersOnlyForNoRangeRequests(
        bool? flag,
        WorkOrderAdvancedSearchDatePreset? preset,
        string? from,
        string? to,
        bool expected)
    {
        Assert.Equal(expected, WorkOrderSearchDateRangeResolver.ResolveIncludeDateless(
            flag,
            preset,
            from is null ? null : DateOnly.Parse(from, CultureInfo.InvariantCulture),
            to is null ? null : DateOnly.Parse(to, CultureInfo.InvariantCulture)));
    }

    [Fact]
    public async Task SearchAsync_RangeForAccountUser_NeverReturnsAnotherAccountsRows()
    {
        await using var context = CreateContext();
        await WorkOrderAccountTestHelpers.EnsureAccountAsync(context, 1, "A");
        await WorkOrderAccountTestHelpers.EnsureAccountAsync(context, 2, "B");
        context.workOrders.AddRange(
            Wo(1, new DateTime(2026, 9, 23), accountId: 1),
            Wo(2, new DateTime(2026, 9, 23), accountId: 2),
            Wo(3, null, status: LifecycleStatus.Incomplete, accountId: 2),
            Wo(4, null, targetWeek: new DateOnly(2026, 9, 21), accountId: 2));
        await context.SaveChangesAsync();

        var user = WorkOrderAccountTestHelpers.AccountUser("disp-1", 1, "Dispatcher");
        var strict = await CreateService(context).SearchAsync(UnassignedInRange(), user, "disp-1");
        var withDateless = await CreateService(context).SearchAsync(
            UnassignedInRange(includeDateless: true), user, "disp-1");

        Assert.Equal(new[] { 1 }, strict.Items.Select(i => i.Id).ToArray());
        Assert.Equal(new[] { 1 }, withDateless.Items.Select(i => i.Id).ToArray());
    }
}