package domain

import (
	"errors"
	"math"
	"testing"
)

func TestRevisionComparisonAndAdvance_HP_CMD_01(t *testing.T) {
	t.Parallel()

	tests := []struct {
		name     string
		current  CommandRevision
		incoming CommandRevision
		want     RevisionRelation
		wantErr  error
	}{
		{"zero current", 0, 1, RevisionInvalid, ErrInvalidRevision},
		{"zero incoming", 1, 0, RevisionInvalid, ErrInvalidRevision},
		{"stale", 4, 3, RevisionStale, ErrStaleRevision},
		{"current", 4, 4, RevisionCurrent, nil},
		{"future", 4, 5, RevisionFuture, ErrFutureRevision},
	}
	for _, test := range tests {
		t.Run(test.name, func(t *testing.T) {
			t.Parallel()
			if got := CompareRevision(test.current, test.incoming); got != test.want {
				t.Fatalf("CompareRevision() = %v, want %v", got, test.want)
			}
			err := ValidateCurrentRevision(test.current, test.incoming)
			if !errors.Is(err, test.wantErr) {
				t.Fatalf("ValidateCurrentRevision() error = %v, want %v", err, test.wantErr)
			}
		})
	}

	if next, err := NextRevision(InitialCommandRevision); err != nil || next != 2 {
		t.Fatalf("NextRevision(1) = (%d, %v), want (2, nil)", next, err)
	}
	if _, err := NextRevision(0); !errors.Is(err, ErrInvalidRevision) {
		t.Fatalf("NextRevision(0) error = %v", err)
	}
	if _, err := NextRevision(math.MaxUint64); !errors.Is(err, ErrRevisionOverflow) {
		t.Fatalf("NextRevision(max) error = %v", err)
	}
}