using BigRegister.Stamdata;

namespace BigRegister.Tests.Domain;

/// <summary>
/// The profession↔program map's validity window (TE-009). `ByProgram` used to be a
/// `static readonly` field filtered on `DateTime.Today` at type-load, so both branches of
/// `StamdataFile.ActiveOn` were unreachable from here and nothing asserted the window at all.
/// Now that the peildatum is a parameter, these are the two branches.
/// </summary>
public class ProfessionsTests
{
  [Fact]
  public void A_mapping_is_absent_before_its_geldigVan()
  {
    // Every seeded row starts 2000-01-01; nothing is valid the day before.
    Assert.Empty(Professions.ByProgramOn(new DateOnly(1999, 12, 31)));
  }

  [Fact]
  public void A_mapping_is_present_on_and_after_its_geldigVan()
  {
    Assert.Equal("Arts", Professions.ByProgramOn(new DateOnly(2000, 1, 1))["geneeskunde"]);
    Assert.Equal("Arts", Professions.ByProgramOn(new DateOnly(2026, 8, 26))["geneeskunde"]);
  }

  [Fact]
  public void A_closed_mapping_is_absent_from_its_geldigTot_onwards()
  {
    // geldigTot is exclusive (`on < tot`), so the row drops out on the boundary date itself.
    foreach (var m in Professions.Mappings.Where(m => m.GeldigTot is DateOnly))
    {
      var tot = m.GeldigTot!.Value;
      Assert.True(Professions.ByProgramOn(tot.AddDays(-1)).ContainsKey(m.Program));
      Assert.False(Professions.ByProgramOn(tot).ContainsKey(m.Program));
    }
  }

  [Fact]
  public void ByProgram_is_evaluated_per_call_not_captured_at_type_load()
  {
    // The regression this guards: a long-running process must not keep serving the answer
    // it computed at startup. Same date in, same answer; different date in, different answer.
    Assert.Equal(Professions.ByProgram.Count, Professions.ByProgramOn(DateOnly.FromDateTime(DateTime.Today)).Count);
    Assert.NotEqual(Professions.ByProgram.Count, Professions.ByProgramOn(new DateOnly(1999, 12, 31)).Count);
  }
}