package domain

import "testing"

func testTierPolicy(t *testing.T) TierPolicy {
	t.Helper()
	policy, err := NewTierPolicy([]TierBand{
		{Tier: RankTierBronze, MinRating: 0},
		{Tier: RankTierSilver, MinRating: 1200},
		{Tier: RankTierGold, MinRating: 1500},
		{Tier: RankTierPlatinum, MinRating: 1800},
	})
	if err != nil {
		t.Fatal(err)
	}
	return policy
}

func TestRankedTierUsesAuthoritativeBandsAndExactBoundaries(t *testing.T) {
	policy := testTierPolicy(t)
	for _, test := range []struct {
		rating float64
		games  int
		want   RankTier
	}{
		{rating: 2000, games: 0, want: RankTierProvisional},
		{rating: 1199.99, games: 10, want: RankTierBronze},
		{rating: 1200, games: 10, want: RankTierSilver},
		{rating: 1499.99, games: 10, want: RankTierSilver},
		{rating: 1500, games: 10, want: RankTierGold},
		{rating: 1800, games: 10, want: RankTierPlatinum},
	} {
		got, err := RankedTier(RankedProfile{Rating: Rating{Value: test.rating}, RankedGames: test.games}, policy)
		if err != nil || got != test.want {
			t.Errorf("rating %.2f games %d = %s, err=%v; want %s", test.rating, test.games, got, err, test.want)
		}
	}
}

func TestTierPolicyRejectsUnorderedOrUnboundedConfiguration(t *testing.T) {
	for _, bands := range [][]TierBand{
		{},
		{{Tier: RankTierBronze, MinRating: 1}},
		{{Tier: RankTierBronze, MinRating: 0}, {Tier: RankTierSilver, MinRating: 0}},
		{{Tier: RankTierBronze, MinRating: 0}, {Tier: RankTierSilver, MinRating: -1}},
		{{Tier: RankTierBronze, MinRating: 0}, {Tier: RankTier(""), MinRating: 1200}},
	} {
		if _, err := NewTierPolicy(bands); err == nil {
			t.Errorf("invalid tier policy accepted: %+v", bands)
		}
	}
	policy := testTierPolicy(t)
	if _, err := RankedTier(RankedProfile{Rating: Rating{Value: 1500}, RankedGames: -1}, policy); err == nil {
		t.Fatal("negative ranked games accepted")
	}
}

func TestDefaultTierPolicyUsesBackendLaunchBands(t *testing.T) {
	tier, err := RankedTier(RankedProfile{Rating: Rating{Value: 1600}, RankedGames: 10}, DefaultTierPolicy())
	if err != nil || tier != RankTierGold {
		t.Fatalf("default tier = (%q, %v), want GOLD", tier, err)
	}
}