using Explorer.Application;
using Explorer.Domain;

namespace Explorer.Application.Tests;

public class BackgroundMaintenancePlannerTests
{
    [Fact]
    public void Skips_network_cloud_and_removable()
    {
        var utc = DateTimeOffset.Parse("2026-08-26T00:00:00Z");
        var chosen = BackgroundMaintenancePlanner.NextLocalScan(
        [
            Source("net", SourceKind.Smb, SourceStatus.Stale, utc.AddDays(-30)),
            Source("cloud", SourceKind.Cloud, SourceStatus.Stale, utc.AddDays(-30)),
            Source("usb", SourceKind.Removable, SourceStatus.Stale, utc.AddDays(-30)),
            Source("local", SourceKind.NtfsLocal, SourceStatus.Stale, utc.AddDays(-30))
        ], utc);
        Assert.NotNull(chosen);
        Assert.Equal("local", chosen.StableKey);
    }

    [Fact]
    public void Prefers_stale_over_old_but_online()
    {
        var utc = DateTimeOffset.Parse("2026-08-26T00:00:00Z");
        var chosen = BackgroundMaintenancePlanner.NextLocalScan(
        [
            Source("old", SourceKind.NtfsLocal, SourceStatus.Online, utc.AddDays(-40)),
            Source("stale", SourceKind.NtfsLocal, SourceStatus.Stale, utc.AddDays(-2))
        ], utc);
        Assert.Equal("stale", chosen!.StableKey);
    }

    [Fact]
    public void Fresh_online_local_is_not_full_rescanned()
    {
        var utc = DateTimeOffset.Parse("2026-08-26T00:00:00Z");
        var chosen = BackgroundMaintenancePlanner.NextLocalScan(
        [
            Source("fresh", SourceKind.NtfsLocal, SourceStatus.Online, utc.AddHours(-2))
        ], utc);
        Assert.Null(chosen);
    }

    [Fact]
    public void Fresh_online_local_is_verified_when_idle()
    {
        var utc = DateTimeOffset.Parse("2026-08-26T00:00:00Z");
        var chosen = BackgroundMaintenancePlanner.NextLocalVerify(
        [
            Source("fresh", SourceKind.NtfsLocal, SourceStatus.Online, utc.AddHours(-2))
        ]);
        Assert.NotNull(chosen);
        Assert.Equal("fresh", chosen.StableKey);
    }

    [Fact]
    public void Does_not_pick_a_source_already_queued()
    {
        var utc = DateTimeOffset.Parse("2026-08-26T00:00:00Z");
        var source = Source("local", SourceKind.NtfsLocal, SourceStatus.Stale, utc.AddDays(-30));
        source.Id = 7;
        var chosen = BackgroundMaintenancePlanner.NextLocalScan([source], utc, alreadyQueued: new HashSet<long> { 7 });
        Assert.Null(chosen);
    }

    private static Source Source(string key, SourceKind kind, SourceStatus status, DateTimeOffset indexed)
        => new()
        {
            StableKey = key,
            DisplayName = key,
            Kind = kind,
            Status = status,
            LastRootPath = @"D:\",
            LastIndexedUtc = indexed
        };
}